SECTION HANGERS AND SUPPORTS FOR HV AC PIPING AND EQUIPMENT

Transcription

1 SECTION HANGERS AND SUPPORTS FOR HV AC PIPING AND EQUIPMENT PART 1- GENERAL 1.1 SUMMARY A. Section Includes: 1. Metal pipe hangers and supports. 2. Trapeze pipe hangers. 3. Thermal-hanger shield inserts. 4. Fastener systems. 5. Equipment supports. 1.2 PERFORMANCE REQUIREMENTS A. Delegated Design: Design trapeze pipe hangers and equipment suppmis, including comprehensive engineering analysis by a qualified professional engineer, using performance requirements and design criteria indicated. 1.3 SUBMITTALS A. Product Data: For each type of product indicated. B. Shop Drawings: Show fabrication and installation details and include calculations for the following; include Product Data for components: 1. Trapeze pipe hangers. 2. Equipment supports. 1.4 QUALITY ASSURANCE A. Structural Steel Welding Qualifications: QualifY procedures and personnel according to A WS D 1.1/D 1.1 M, "Structural Welding Code - Steel." PART 2- PRODUCTS 2.1 METAL PIPE HANGERS AND SUPPORTS A. Carbon-Steel Pipe Hangers and Supports: 1. Description: MSS SP-58, Types 1 through 58, factory-fabricated components. 2. Galvanized Metallic Coatings: Pregalvanized or hot dipped. 3. Nonmetallic Coatings: Plastic coating, jacket, or liner. PWA /1 HANGERSANDSUPPORTSFOR HVAC PIPING AND EQUIPMENT

2 4. Padded Hangers: Hanger with fiberglass or other pipe insulation pad or cushion to support bearing surface of piping. 5. Hanger Rods: Continuous-thread rod, nuts, and washer made of carbon steel. B. Copper Pipe Hangers: 1. Description: MSS SP-58, Types 1 through 58, copper-coated-steel, factory-fabricated components. 2. Hanger Rods: Continuous-thread rod, nuts, and washer made of copper-coated steel. 2.2 TRAPEZE PIPE HANGERS A. Description: MSS SP-69, Type 59, shop- or field-fabricated pipe-support assembly made from structural carbon-steel shapes with MSS SP-58 carbon-steel hanger rods, nuts, saddles, and U bolts. 2.3 THERMAL-HANGER SHIELD INSERTS A. B. C. D. E. Insulation-Insert Material for Cold Piping: ASTM C 591, Type VI, Grade 1 polyisocyanurate with 125-psig minimum compressive strength and vapor barrier. Insulation-Insert Material for Hot Piping: ASTM C 591, Type VI, Grade 1 polyisocyanurate with 125-psig minimum compressive strength. For Trapeze or Clamped Systems: Insert and shield shall cover entire circumference of pipe. For Clevis or Band Hangers: Insert and shield shall cover lower 180 degrees of pipe. Insert Length: Extend 2 inches beyond sheet metal shield for piping operating below ambient air temperature. 2.4 FASTENER SYSTEMS A. Powder-Actuated Fasteners: Threaded-steel stud, for use in hardened portland cement concrete with pull-out, tension, and shear capacities appropriate for supported loads and building materials where used. B. Mechanical-Expansion Anchors: Insert-wedge-type, zinc-coated steel anchors, for use in hardened portland cement concrete; with pull-out, tension, and shear capacities appropriate for suppmied loads and building materials where used. 2.5 EQUIPMENT SUPPORTS A. Description: Welded, shop- or field-fabricated equipment suppoti made from structural carbonsteel shapes. PWA /2 HANGERSANDSUPPORTSFOR HVAC PIPING AND EQUIPMENT

3 2.6 MISCELLANEOUS MATERIALS A. Structural Steel: ASTM A 36/A 36M, carbon-steel plates, shapes, and bars; black and galvanized. B. Grout: ASTM C 1107, factory-mixed and -packaged, dry, hydraulic-cement, nonshrink and nonmetallic grout; suitable for interior and exterior applications. 1. Properties: Nonstaining, noncorrosive, and nongaseous. 2. Design Mix: 5000-psi, 28-day compressive strength. PART 3- EXECUTION 3.1 HANGER AND SUPPORT INSTALLATION A. B. Metal Pipe-Hanger Installation: Comply with MSS SP-69 and MSS SP-89. Install hangers, supports, clamps, and attachments as required to properly support piping from the building structure. Metal Trapeze Pipe-Hanger Installation: Comply with MSS SP-69 and MSS SP-89. Arrange for grouping of parallel runs of horizontal piping, and support together on field-fabricated trapeze pipe hangers. 1. Pipes of Various Sizes: Support together and space trapezes for smallest pipe size or install intermediate supports for smaller diameter pipes as specified for individual pipe hangers. 2. Field fabricate from ASTM A 36/A 36M, carbon-steel shapes selected for loads being supported. Weld steel according to A WS D 1.1/D 1.1 M. C. Thermal-Hanger Shield Installation: Install in pipe hanger or shield for insulated piping. D. Fastener System Installation: 1. Install powder-actuated fasteners for use in lightweight concrete or concrete slabs less than 4 inches thick in concrete after concrete is placed and completely cured. Use operators that are licensed by powder-actuated tool manufacturer. Install fasteners according to powder-actuated tool manufacturer's operating manual. 2. Install mechanical-expansion anchors in concrete after concrete is placed and completely cured. Install fasteners according to manufacturer's written instructions. E. Install hangers and supports complete with necessary attachments, inserts, bolts, rods, nuts, washers, and other accessories. F. Equipment Support Installation: Fabricate from welded-structural-steel shapes. G. Install hangers and suppmis to allow controlled thermal and seismic movement of piping systems, to permit freedom of movement between pipe anchors, and to facilitate action of expansion joints, expansion loops, expansion bends, and similar units. PWA /3 HANGERSANDSUPPORTSFOR HVAC PIPING AND EQUIPMENT

4 H. Install lateral bracing with pipe hangers and supports to prevent swaying. I. Install building attachments within concrete slabs or attach to structural steel. Install additional attachments at concentrated loads, including valves, flanges, and strainers, NPS and larger and at changes in direction of piping. Install concrete inserts before concrete is placed; fasten inserts to forms and install reinforcing bars through openings at top of inserts. J. Load Distribution: Install hangers and supports so that piping live and dead loads and stresses from movement will not be transmitted to connected equipment. K. Pipe Slopes: Install hangers and supports to provide indicated pipe slopes and to not exceed maximum pipe deflections allowed by ASME B31.9 for building services piping. L. Insulated Piping: 1. Attach clamps and spacers to piping. a. Piping Operating above Ambient Air Temperature: Clamp may project through insulation. b. Piping Operating below Ambient Air Temperature: Use thermal-hanger shield insert with clamp sized to match OD of insert. c. Do not exceed pipe stress limits allowed by ASME B31.9 for building services piping. 2. Install MSS SP-58, Type 39, protection saddles if insulation without vapor barrier is indicated. Fill interior voids with insulation that matches adjoining insulation. a. Option: Thermal-hanger shield inserts may be used. Include steel weightdistribution plate for pipe NPS 4 and larger if pipe is installed on rollers. 3. Install MSS SP-58, Type 40, protective shields on cold piping with vapor barrier. Shields shall span an arc of 180 degrees. a. Option: Thermal-hanger shield inserts may be used. Include steel weightdistribution plate for pipe NPS 4 and larger if pipe is installed on rollers. 4. Shield Dimensions for Pipe: Not less than the following: a. NPS 114 to NPS 3-1/2: 12 inches long and inch thick. 5. Thermal-Hanger Shields: Install with insulation same thickness as piping insulation. 3.2 EQUIPMENT SUPPORTS A. Fabricate structural-steel stands to suspend equipment from structure overhead or to support equipment above floor. B. Grouting: Place grout under supports for equipment and make bearing surface smooth. C. Provide lateral bracing, to prevent swaying, for equipment supports. PWA /4 HANGERS AND SUPPORTS FOR HVAC PIPING AND EQUIPMENT

5 3.3 METAL FABRICATIONS A. Cut, drill, and fit miscellaneous metal fabrications for equipment suppotis. B. Fit exposed connections together to form hairline joints. Field weld connections that cannot be shop welded because of shipping size limitations. C. Field Welding: Comply with AWS Dl.l/Dl.lM procedures for shielded, metal arc welding; appearance and quality of welds; and methods used in correcting welding work; and with the following: 1. Use materials and methods that minimize distortion and develop strength and corrosion resistance of base metals. 2. Obtain fusion without undercut or overlap. 3. Remove welding flux immediately. 4. Finish welds at exposed connections so no roughness shows after finishing and so contours of welded surfaces match adjacent contours. 3.4 ADJUSTING A. Hanger Adjustments: Adjust hangers to distribute loads equally on attachments and to achieve indicated slope of pipe. B. Trim excess length of continuous-thread hanger and support rods to 1-1/2 inches. 3.5 PAINTING A. Touchup: Clean field welds and abraded areas of shop paint. Paint exposed areas immediately after erecting hangers and supports. Use same materials as used for shop painting. Comply with SSPC-PA l requirements for touching up field-painted surfaces. 1. Apply paint by brush or spray to provide a minimum dry film thickness of2.0 mils. B. Touchup: Cleaning and touch up painting of field welds, bolted connections, and abraded areas of shop paint on miscellaneous metal are specified in Section "Exterior Painting" C. Galvanized Surfaces: Clean welds, bolted connections, and abraded areas and apply galvanizing-repair paint to comply with ASTM A HANGER AND SUPPORT SCHEDULE A. Specific hanger and support requirements are m Sections specifying piping systems and equipment. B. Comply with MSS SP-69 for pipe-hanger selections and applications that are not specified in piping system Sections. PWA /5 HANGERS AND SUPPORTS FOR HVAC PIPING AND EQUIPMENT

6 C. Use hangers and supports with galvanized metallic coatings for piping and equipment that will not have field-applied finish. D. Use nonmetallic coatings on attachments for electrolytic protection where attachments are in direct contact with copper tubing. E. Use carbon-steel pipe hangers and supports and attachments for general service applications. F. Use stainless-steel pipe hangers and stainless-steel or corrosion-resistant attachments for hostile environment applications. G. Use copper-plated pipe hangers and copper attachments for copper piping and tubing. H. Use padded hangers for piping that is subject to scratching. I. Use thermal-hanger shield inserts for insulated piping and tubing. J. Horizontal-Piping Hangers and Supports: Unless otherwise indicated and except as specified in piping system Sections, install the following types: 1. Adjustable, Steel Clevis Hangers (MSS Type 1 ): For suspension of noninsulated or insulated, stationary pipes NPS 1/2 to NPS Yoke-Type Pipe Clamps (MSS Type2): For suspension of up to 1050 degf, pipes NPS 4 to NPS 24, requiring up to 4 inches of insulation. 3. Carbon- or Alloy-Steel, Double-Bolt Pipe Clamps (MSS Type 3): For suspension of pipes NPS 3/4 to NPS 36, requiring clamp flexibility and up to 4 inches of insulation. 4. Adjustable, Steel Band Hangers (MSS Type 7): For suspension of noninsulated, stationary pipes NPS 112 to NPS U-Bolts (MSS Type 24): For suppoti of heavy pipes NPS 1/2 to NPS Pipe Saddle Supports (MSS Type 36): For suppoti of pipes NPS 4 to NPS 36, with steelpipe base stanchion suppoti and cast-iron floor flange or carbon-steel plate. 7. Pipe Stanchion Saddles (MSS Type 37): For support of pipes NPS 4 to NPS 36, with steel-pipe base stanchion support and cast-iron floor flange or carbon-steel plate, and with U-bolt to retain pipe. 8. Single-Pipe Rolls (MSS Type 41): For suspension of pipes NPS 1 to NPS 30, from two rods if longitudinal movement caused by expansion and contraction might occur. 9. Complete Pipe Rolls (MSS Type 44): For support of pipes NPS 2 to NPS 42 if longitudinal movement caused by expansion and contraction might occur but vertical adjustment is not necessary. K. Vertical-Piping Clamps: Unless otherwise indicated and except as specified in piping system Sections, install the following types: 1. Extension Pipe or Riser Clamps (MSS Type 8): For suppoti of pipe risers NPS 3/4 to NPS Carbon- or Alloy-Steel Riser Clamps (MSS Type 42): For support of pipe risers NPS 3/4 to NPS 24 if longer ends are required for riser clamps. L. Hanger-Rod Attachments: Unless otherwise indicated and except as specified in piping system Sections, install the following types: PWA /6 HANGERS AND SUPPORTS FOR HVAC PIPING AND EQUIPMENT

7 1. Steel Turnbuckles (MSS Type 13): For adjustment up to 6 inches for heavy loads. 2. Steel Clevises (MSS Type 14): For 120 to 450 deg F piping installations. M. Building Attachments: Unless otherwise indicated and except as specified in piping system Sections, install the following types: 1. Steel or Malleable Concrete Inserts (MSS Type 18): For upper attachment to suspend pipe hangers from concrete ceiling. 2. Top-Beam C-Clamps (MSS Type 19): For use under roof installations with bar-joist construction, to attach to top flange of structural shape. 3. Side-Beam or Channel Clamps (MSS Type 20): For attaching to bottom flange of beams, channels, or angles. 4. Center-Beam Clamps (MSS Type 21): For attaching to center of bottom flange of beams. 5. Welded Beam Attachments (MSS Type 22): For attaching to bottom of beams if loads are considerable and rod sizes are large. 6. C-Clamps (MSS Type 23): For structural shapes. 7. Welded-Steel Brackets: For support of pipes from below, or for suspending from above by using clip and rod. Use one of the following for indicated loads: a. Light (MSS Type 31): 750 lb. b. Medium (MSS Type 32): 1500 lb. c. Heavy (MSS Type 33): 3000 lb. 8. Side-Beam Brackets (MSS Type 34): For sides of steel or wooden beams. 9. Plate Lugs (MSS Type 57): For attaching to steel beams if flexibility at beam is required. N. Saddles and Shields: Unless otherwise indicated and except as specified in piping system Sections, install the following types: 1. Steel-Pipe-Covering Protection Saddles (MSS Type 39): To fill interior voids with insulation that matches adjoining insulation. 2. Protection Shields (MSS Type 40): Of length recommended in writing by manufacturer to prevent crushing insulation. 3. Thermal-Hanger Shield Inserts: For supporting insulated pipe. 0. Spring Hangers and Supports: Unless otherwise indicated and except as specified in piping system Sections, install the following types: 1. Spring Cushions (MSS Type 48): For light loads if vertical movement does not exceed inches. 2. Spring-Cushion Roll Hangers (MSS Type 49): For equipping Type 41, roll hanger with springs. 3. Variable-Spring Base Supports (MSS Type 52): Preset to indicated load and limit variability factor to 25 percent to allow expansion and contraction of piping system from base support. P. Comply with MSS SP-69 for trapeze pipe-hanger selections and applications that are not specified in piping system Sections. PWA /7 HANGERS AND SUPPORTS FOR HVAC PIPING AND EQUIPMENT

8 Q. Use powder-actuated fasteners or mechanical-expansion anchors instead of building attachments where required in concrete construction. END OF SECTION PWA /8 HANGERS AND SUPPORTS FOR HVAC PIPING AND EQUIPMENT

9 SECTION TESTING, ADJUSTING, AND BALANCING FOR HV AC PART 1- GENERAL 1.1 SUMMARY A. Section Includes: 1. Balancing Air Systems: a. Constant-volume air systems. b. Variable-air-volume systems. 1.2 DEFINITIONS A. AABC: Associated Air Balance Council. B. NEBB: National Environmental Balancing Bureau. c. TAB: Testing, adjusting, and balancing. D. TABB: Testing, Adjusting, and Balancing Bureau. E. TAB Specialist: An independent entity meeting qualifications to perform TAB work. F. TDH: Total dynamic head. 1.3 INFORMATIONAL SUBMITTALS A. Certified TAB repotis. 1.4 QUALITY ASSURANCE A. TAB Specialists Qualifications: Certified by AABC, NEBB, or TABB. 1. TAB Field Supervisor: Employee of the TAB specialist and certified by AABC, NEBB, or TABB. 2. TAB Technician: Employee of the TAB specialist and certified by AABC, NEBB, or T ABB as a TAB technician. B. Instrumentation Type, Quantity, Accuracy, and Calibration: Comply with requirements in ASHRAE 111, Section 4, "Instrumentation." C. ASHRAE Compliance: Applicable requirements m ASHRAE 62.1, Section "Air Balancing." PWA / 1 TESTING, ADJUSTING, AND BALANCING FOR HVAC

10 D. ASHRAE/IESNA Compliance: Applicable requirements m ASHRAE/IESNA 90.1, Section "System Balancing." PART 2- PRODUCTS (Not Applicable) PART 3- EXECUTION 3.1 EXAMINATION A. B. c. D. E. F. Examine the Contract Documents to become familiar with Project requirements and to discover conditions in systems designs that may preclude proper TAB of systems and equipment. Examine installed systems for balancing devices, such as test ports, gage cocks, thermometer wells, flow-control devices, balancing valves and fittings, and manual volume dampers. Verify that locations of these balancing devices are applicable for intended purpose and are accessible. Examine the approved submittals for HV AC systems and equipment. Examine design data including HV AC system descriptions, statements of design assumptions for environmental conditions and systems output, and statements of philosophies and assumptions about HV AC system and equipment controls. Examine ceiling plenums and underfloor air plenums used for supply, return, or relief air to verify that they are properly separated from adjacent areas. Verify that penetrations in plenum walls are sealed and fire-stopped if required. Examine equipment performance data including fan and pump curves. 1. Relate performance data to Project conditions and requirements, including system effects that can create undesired or unpredicted conditions that cause reduced capacities in all or part of a system. 2. Calculate system-effect factors to reduce performance ratings of HV AC equipment when installed under conditions different from the conditions used to rate equipment performance. To calculate system effects for air systems, use tables and charts found in AMCA 201, "Fans and Systems," or in SMACNA's "HV AC Systems - Duct Design." Compare results with the design data and installed conditions. G. Examine system and equipment installations and verify that field quality-control testing, cleaning, and adjusting specified in individual Sections have been performed. H. Examine test reports specified in individual system and equipment Sections. I. Examine HV AC equipment and verify that bearings are greased, belts are aligned and tight, filters are clean, and equipment with functioning controls is ready for operation. J. Examine terminal units, such as variable-air-volume boxes, and verify that they are accessible and their controls are connected and functioning. K. Examine heat-transfer coils for correct piping connections and for clean and straight fins. PWA / 2 TESTING, ADJUSTING, AND BALANCING FOR HVAC

11 L. Examine operating safety interlocks and controls on HV AC equipment. M. Report deficiencies discovered before and during performance oft AB procedures. Observe and record system reactions to changes in conditions. Record default set points if different from indicated values. 3.2 PREPARATION A. Prepare a TAB plan that includes strategies and step-by-step procedures for balancing the systems. B. Perform system-readiness checks of HV AC systems and equipment to verify system readiness for TAB work. Include, at a minimum, the following: 1. Airside: a. Duct systems are complete with terminals installed. b. Permanent electrical-power wiring is complete. c. Volume, smoke, and fire dampers are open and functional. d. Clean filters are installed. e. Fans are operating, free of vibration, and rotating in correct direction. f. Equipment and duct access doors are securely closed. g. Variable-frequency controllers' startup is complete and safeties are verified. h. Automatic temperature-control systems are operational. i. Isolation and balancing valves are open and control valves are operational. J. Ceilings are installed. k. Windows and doors are installed. l. Suitable access to balancing devices and equipment is provided. 3.3 GENERAL PROCEDURES FOR TESTING AND BALANCING A. Perform testing and balancing procedures on each system according to the procedures contained in SMACNA's "HV AC Systems - Testing, Adjusting, and Balancing" and in this Section. B. Cut insulation, ducts, pipes, and equipment cabinets for installation of test probes to the minimum extent necessary for TAB procedures. 1. After testing and balancing, patch probe holes in ducts with same material and thickness as used to construct ducts. 2. After testing and balancing, install test ports and duct access doors that comply with requirements in Section "Air Duct Accessories." 3. Install and join new insulation that matches removed materials. Restore insulation, coverings, vapor barrier, and finish according to Section "Duct Insulation," Section "HV AC Equipment Insulation," and Section "HVAC Piping Insulation." C. Mark equipment and balancing devices, including damper-control positions, valve position indicators, fan-speed-control levers, and similar controls and devices, with paint or other suitable, permanent identification material to show final settings. PWA /3 TESTING, ADJUSTING, AND BALANCING FOR HVAC

12 D. Take and rep01i testing and balancing measurements in inch-pound (IP) units. 3.4 A. B. c. D. E. F. G. H. I. J. K. L. GENERAL PROCEDURES FOR BALANCING AIR SYSTEMS Prepare test reports for both fans and outlets. Obtain manufacturer's outlet factors and recommended testing procedures. Cross-check the summation of required outlet volumes with required fan volumes. Prepare schematic diagrams of systems' "as-built" duct layouts. For variable-air-volume systems, develop a plan to simulate diversity. Determine the best locations in main and branch ducts for accurate duct-airflow measurements. Check airflow patterns from the outdoor-air louvers and dampers and the return- and exhaust-air dampers through the supply-fan discharge and mixing dampers. Locate start-stop and disconnect switches, electrical interlocks, and motor starters. Verify that motor starters are equipped with properly sized thermal protection. Check dampers for proper position to achieve desired airflow path. Check for airflow blockages. Check condensate drains for proper connections and functioning. Check for proper sealing of air-handling-unit components. Verify that air duct system is sealed as specified in Section "Metal Ducts." 3.5 A. PROCEDURES FOR CONSTANT-VOLUME AIR SYSTEMS Adjust fans to deliver total indicated airflows within the maximum allowable fan speed listed by fan manufacturer. 1. Measure total airflow. a. Set outside-air, return-air, and relief-air dampers for proper position that simulates minimum outdoor-air conditions. b. Where duct conditions allow, measure airflow by Pitot-tube traverse. If necessary, perform multiple Pitot-tube traverses to obtain total airflow. c. Where duct conditions are not suitable for Pitot-tube traverse measurements, a coil traverse may be acceptable. d. If a reliable Pitot-tube traverse or coil traverse is not possible, measure airflow at terminals and calculate the total airflow. 2. Measure fan static pressures as follows: a. Measure static pressure directly at the fan outlet or through the flexible connection. PWA / 4 TESTING, ADJUSTING, AND BALANCING FOR HVAC

13 b. Measure static pressure directly at the fan inlet or through the flexible connection. c. Measure static pressure across each component that makes up the air-handling system. d. Report artificial loading of filters at the time static pressures are measured. 3. Review Record Documents to determine variations in design static pressures versus actual static pressures. Calculate actual system-effect factors. Recommend adjustments to accommodate actual conditions. 4. Obtain approval from Architect for adjustment of fan speed higher or lower than indicated speed. Comply with requirements in HV AC Sections for air-handling units for adjustment of fans, belts, and pulley sizes to achieve indicated air-handling-unit performance. 5. Do not make fan-speed adjustments that result in motor overload. Consult equipment manufacturers about fan-speed safety factors. Modulate dampers and measure fan-motor amperage to ensure that no overload occurs. Measure amperage in full-cooling, fullheating, economizer, and any other operating mode to determine the maximum required brake horsepower. B. Adjust volume dampers for main duct, submain ducts, and major branch ducts to indicated airflows. 1. Measure airflow of submain and branch ducts. 2. Adjust submain and branch duct volume dampers for specified airflow. 3. Re-measure each sub main and branch duct after all have been adjusted. C. Adjust air inlets and outlets for each space to indicated airflows. 1. Set airflow patterns of adjustable outlets for proper distribution without drafts. 2. Measure inlets and outlets airflow. 3. Adjust each inlet and outlet for specified airflow. 4. Re-measure each inlet and outlet after they have been adjusted. 3.6 A. PROCEDURES FOR VARIABLE-AIR-VOLUME SYSTEMS Adjust the variable-air-volume systems as follows: 1. Verify that the system static pressure sensor is located two-thirds of the distance down the duct from the fan discharge. 2. Verify that the system is under static pressure control. 3. Select the terminal unit that is most critical to the supply-fan airflow. Measure inlet static pressure, and adjust system static pressure control set point so the entering static pressure for the critical terminal unit is not less than the sum of the terminal-unit manufacturer's recommended minimum inlet static pressure plus the static pressure needed to overcome terminal-unit discharge system losses. 4. Calibrate and balance each terminal unit for maximum and minimum design airflow as follows: PWA /5 TESTING, ADJUSTING, AND BALANCING FOR HVAC

14 a. Adjust controls so that terminal is calling for maximum airflow. Some controllers require starting with minimum airflow. Verify calibration procedure for specific project. b. Measure airflow and adjust calibration factor as required for design maximum airflow. Record calibration factor. c. When maximum airflow is correct, balance the air outlets downstream from terminal units. d. Adjust controls so that terminal is calling for minimum airflow. e. Measure airflow and adjust calibration factor as required for design minimum airflow. Record calibration factor. If no minimum calibration is available, note any deviation from design airflow. f. When in full cooling or full heating, ensure that there is no mixing of hot-deck and cold-deck airstreams unless so designed. g. On constant volume terminals, in critical areas where room pressure is to be maintained, verify that the airflow remains constant over the full range of full cooling to full heating. Note any deviation from design airflow or room pressure. 5. After terminals have been calibrated and balanced, test and adjust system for total airflow. Adjust fans to deliver total design airflows within the maximum allowable fan speed listed by fan manufacturer. a. Set outside-air, return-air, and relief-air dampers for proper position that simulates minimum outdoor-air conditions. b. Set terminals for maximum airflow. If system design includes diversity, adjust terminals for maximum and minimum airflow so that connected total matches fan selection and simulates actual load in the building. c. Where duct conditions allow, measure airflow by Pitot-tube traverse. If necessary, perform multiple Pitot-tube traverses to obtain total airflow. d. Where duct conditions are not suitable for Pitot-tube traverse measurements, a coil traverse may be acceptable. e. If a reliable Pitot-tube traverse or coil traverse is not possible, measure airflow at terminals and calculate the total airflow. 6. Measure fan static pressures as follows: a. Measure static pressure directly at the fan outlet or through the flexible connection. b. Measure static pressure directly at the fan inlet or through the flexible connection. c. Measure static pressure across each component that makes up the air-handling system. d. Report any artificial loading of filters at the time static pressures are measured. 7. Set final return and outside airflow to the fan while operating at maximum return airflow and minimum outdoor airflow. a. Balance the return-air ducts and inlets the same as described for constant-volume air systems. b. Verify that terminal units are meeting design airflow under system maximum flow. 8. Re-measure the inlet static pressure at the most critical terminal unit and adjust the system static pressure set point to the most energy-efficient set point to maintain the optimum system static pressure. Record set point and give to controls contractor. PWA /6 TESTING, ADJUSTING, AND BALANCING FOR HVAC

15 9. Verity final system conditions as follows: a. Re-measure and confirm that minimum outdoor, return, and relief airflows are within design. Readjust to match design if necessary. b. Re-measure and confirm that total airflow is within design. c. Re-measure final fan operating data, rpms, volts, amps, and static profile. d. Mark final settings. e. Test system in economizer mode. Verity proper operation and adjust if necessary. Measure and record all operating data. f. V erizy tracking between supply and return fans. 3.7 TOLERANCES A. Set HV AC system's airflow rates and water flow rates within the following tolerances: 1. Supply, Return, and Exhaust Fans and Equipment with Fans: Plus or minus 10 percent. 2. Air Outlets and Inlets: Plus or minus 10 percent. B. Maintaining pressure relationships as designed shall have priority over the tolerances specified above. 3.8 FINAL REPORT A. General: Prepare a certified written repmi; tabulate and divide the report into separate sections for tested systems and balanced systems. 1. Include a cetiification sheet at the front of the report's binder, signed and sealed by the certified testing and balancing engineer. 2. Include a list of instruments used for procedures, along with proof of calibration. 3. CertifY validity and accuracy of field data. B. Final Report Contents: In addition to certified field-report data, include the following: 1. Pump curves. 2. Fan curves. 3. Manufacturers' test data. 4. Field test reports prepared by system and equipment installers. 5. Other information relative to equipment performance; do not include Shop Drawings and Product Data. C. General Repoti Data: In addition to form titles and entries, include the following data: 1. Title page. 2. Name and address of the TAB specialist. 3. Project name. 4. Project location. 5. Architect's name and address. 6. Engineer's name and address. 7. Contractor's name and address. PWA /7 TESTING, ADJUSTING, AND BALANCING FOR HVAC

16 8. Report date. 9. Signature oftab supervisor who certifies the repoti. 10. Table of Contents with the total number of pages defined for each section of the report. Number each page in the report. 11. Summary of contents including the following: a. Indicated versus final performance. b. Notable characteristics of systems. c. Description of system operation sequence if it varies from the Contract Documents. 12. Nomenclature sheets for each item of equipment. 13. Data for terminal units, including manufacturer's name, type, size, and fittings. 14. Notes to explain why certain final data in the body of reports vary from indicated values. 15. Test conditions for fans and pump performance forms including the following: a. Settings for outdoor-, return-, and exhaust-air dampers. b. Conditions of filters. c. Cooling coil, wet- and dry-bulb conditions. d. Face and bypass damper settings at coils. e. Fan drive settings including settings and percentage of maximum pitch diameter. f. Inlet vane settings for variable-air-volume systems. g. Settings for supply-air, static-pressure controller. h. Other system operating conditions that affect performance. D. System Diagrams: Include schematic layouts of air and hydronic distribution systems. Present each system with single-line diagram and include the following: 1. Quantities of outdoor, supply, return, and exhaust airflows. 2. Duct, outlet, and inlet sizes. 3. Pipe and valve sizes and locations. 4. Terminal units. 5. Balancing stations. 6. Position of balancing devices. 3.9 A. ADDITIONAL TESTS Seasonal Periods: If initial TAB procedures were not performed during near-peak summer and winter conditions, perform additional TAB during near-peak summer and winter conditions. END OF SECTION PWA /8 TESTING, ADJUSTING, AND BALANCING FOR HVAC

17 SECTION DUCT INSULATION PART 1 - GENERAL 1.1 SUMMARY A. Section includes insulating the following duct services: 1. Indoor, concealed supply and outdoor air. 2. Indoor, concealed return located in unconditioned space. 3. Indoor, concealed exhaust between isolation damper and penetration of building exterior. B. Related Sections: 1. Section "HV AC Equipment Insulation." 2. Section "HV AC Piping Insulation." 1.2 ACTION SUBMITTALS A. Product Data: For each type of product indicated. B. Shop Drawings: Include plans, elevations, sections, details, and attachments to other work. 1. Detail application of protective shields, saddles, and inserts at hangers for each type of insulation and hanger. 2. Detail insulation application at elbows, fittings, dampers, specialties and flanges for each type of insulation. 3. Detail application of field-applied jackets. 4. Detail application at linkages of control devices. 1.3 INFORMATIONAL SUBMITTALS A. Field quality-control reports. 1.4 QUALITY ASSURANCE A. Surface-Burning Characteristics: For insulation and related materials, as determined by testing identical products according to ASTM E 84, by a testing agency acceptable to authorities having jurisdiction. Factory label insulation and jacket materials and adhesive, mastic, tapes, and cement material containers, with appropriate markings of applicable testing agency. 1. Insulation Installed Indoors: Flame-spread index of 25 or less, and smoke-developed index of 50 or less. 2. Insulation Installed Outdoors: Flame-spread index of 75 or less, and smoke-developed index of 150 or less. PWA I 1 DUCT INSULATION

18 PART 2- PRODUCTS 2. I INSULATION MATERIALS A. Comply with requirements in "Duct Insulation Schedule, General," "Indoor Duct and Plenum Insulation Schedule," and "Aboveground, Outdoor Duct and Plenum Insulation Schedule" articles for where insulating materials shall be applied. B. Products shall not contain asbestos, lead, mercury, or mercury compounds. C. Products that come in contact with stainless steel shall have a leachable chloride content of less than 50 ppm when tested according to ASTM C 871. D. Insulation materials for use on austenitic stainless steel shall be qualified as acceptable according to ASTM C 795. E. Foam insulation materials shall not use CFC or HCFC blowing agents in the manufacturing process. F. Mineral-Fiber Blanket Insulation: Mineral or glass fibers bonded with a thermosetting resin. Comply with ASTM C 553, Type II and ASTM C 1290, Type III with factory-applied FSK jacket. Factory-applied jacket requirements are specified in "Factory-Applied Jackets" Article. I. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: a. CertainTeed Corporation. b. Johns Manville; a Berkshire Hathaway company. c. Knauf Insulation. 2.2 FIRE-RATED INSULATION SYSTEMS A. Fire-Rated Blanket: High-temperature, flexible, blanket insulation with FSKjacket that is tested and ce11ified to provide a 1-hour fire rating by an NRTL acceptable to authorities having jurisdiction. 1. Manufacturers: Subject to compliance with requirements, provide products by one of the following: a. 3M. b. CertainTeed Corporation. c. Johns Manville; a Berkshire Hathaway company. 2.3 ADHESIVES A. Materials shall be compatible with insulation materials, jackets, and substrates and for bonding insulation to itself and to surfaces to be insulated unless otherwise indicated. B. Mineral-Fiber Adhesive: Comply with MIL-A-3316C, Class 2, Grade A. PWA /2 DUCT INSULATION

19 1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: a. Childers Brand; H. B. Fuller Construction Products. b. Eagle Bridges - Marathon Industries. c. Foster Brand; H. B. Fuller Construction Products. c. ASJ Adhesive, and FSK Jacket Adhesive: Comply with MIL-A-3316C, Class 2, Grade A for bonding insulation jacket lap seams and joints. 1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: a. Childers Brand; H. B. Fuller Construction Products. b. Eagle Bridges - Marathon Industries. c. Foster Brand; H. B. Fuller Construction Products. 2.4 A. B. MASTICS Materials shall be compatible with insulation materials, jackets, and substrates; comply with MIL-PRF-19565C, Type II. Vapor-Barrier Mastic: Water based; suitable for indoor use on below ambient services. 1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: a. Foster Brand; H. B. Fuller Construction Products. b. Vimasco Corporation. 2. Water-Vapor Permeance: ASTM E 96/E 96M, Procedure B, perm at 43-mil dry film thickness. 3. Service Temperature Range: Minus 20 to plus 180 deg F. 4. Solids Content: ASTM D 1644, 58 percent by volume and 70 percent by weight. 5. Color: White. C. Breather Mastic: Water based; suitable for indoor and outdoor use on above ambient services. 1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: a. Childers Brand; H. B. Fuller Construction Products. b. Eagle Bridges - Marathon Industries. c. Foster Brand; H. B. Fuller Construction Products. d. Vimasco Corporation. 2. Water-Vapor Permeance: ASTM F 1249, 1.8 perms at inch dry film thickness. 3. Service Temperature Range: Minus 20 to plus 180 deg F. 4. Solids Content: 60 percent by volume and 66 percent by weight. PWA /3 DUCT INSULATION

20 5. Color: White. 2.5 SEALANTS A. FSK and Metal Jacket Flashing Sealants: 1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: a. Childers Brand; H. B. Fuller Construction Products. b. Eagle Bridges - Marathon Industries. c. Foster Brand; H. B. Fuller Construction Products. 2. Materials shall be compatible with insulation materials, jackets, and substrates. 3. Fire- and water-resistant, flexible, elastomeric sealant. 4. Service Temperature Range: Minus 40 to plus 250 deg F. 5. Color: Aluminum. 2.6 FACTORY-APPLIED JACKETS A. Insulation system schedules indicate factory-applied jackets on various applications. When factory-applied jackets are indicated, comply with the following: 1. FSK Jacket: Aluminum-foil, fiberglass-reinforced scrim with kraft-paper backing; complying with ASTM C 1136, Type II. 2.7 TAPES A. FSK Tape: Foil-face, vapor-retarder tape matching factory-applied jacket with acrylic adhesive; complying with ASTM C Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: a. A very Dennison Corporation, Specialty Tapes Division. b. Compac Corporation. c. Ideal Tape Co., Inc,; an American Biltrite company. 2. Width: 3 inches. 3. Thickness: 6.5 mils. 4. Adhesion: 90 ounces force/inch in width. 5. Elongation: 2 percent. 6. Tensile Strength: 40 lbf/inch in width. 7. FSK Tape Disks and Squares: Precut disks or squares offsk tape. PWA I 4 DUCT INSULATION

21 2.8 A. B. SECUREMENTS Aluminum Bands: ASTM B 209, Alloy 3003, 3005, 3105, or 5005; Temper H-14, inch thick, 3/4 inch wide with wing seal. 1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: a. ITW Insulation Systems; Illinois Tool Works, Inc. b. RPR Products, Inc. Insulation Pins and Hangers: 1. Metal, Adhesively Attached, Perforated-Base Insulation Hangers: Baseplate welded to projecting spindle that is capable of holding insulation, of thickness indicated, securely in position indicated when self-locking washer is in place. Comply with the following requirements: a. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: 1) AGM Industries, Inc. 2) Gemco. 3) Midwest Fasteners, Inc. b. Baseplate: Perforated, galvanized carbon-steel sheet, inch thick by 2 inches square. c. Spindle: Copper- or zinc-coated, low-carbon steel, fully annealed, inchdiameter shank, length to suit depth of insulation indicated. d. Adhesive: Recommended by hanger manufacturer. Product with demonstrated capability to bond insulation hanger securely to substrates indicated without damaging insulation, hangers, and substrates. 2. Insulation-Retaining Washers: Self-locking washers formed from inch- thick, galvanized-steel sheet, with beveled edge sized as required to hold insulation securely in place but not less than inches in diameter. a. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: 1) AGM Industries, Inc. 2) Gemco. 3) Midwest Fasteners, Inc. b. Protect ends with capped self-locking washers incorporating a spring steel insert to ensure permanent retention of cap in exposed locations. C. Staples: Outward-clinching insulation staples, nominal 3/4-inch- wide, stainless steel or Monel. D. Wire: inch soft-annealed, galvanized steel. PWA I 5 DUCT INSULATION

22 1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: a. C & F Wire. 2.9 A. CORNER ANGLES PVC Corner Angles: 30 mils thick, minimum 1 by 1 inch, PVC according to ASTM D 1784, Class C. White or color-coded to match adjacent surface. PART 3- EXECUTION 3.1 PREPARATION A. Surface Preparation: Clean and dry surfaces to receive insulation. Remove materials that will adversely affect insulation application. 3.2 GENERAL INSTALLATION REQUIREMENTS A. B. C. D. E. F. G. H. I. Install insulation materials, accessories, and finishes with smooth, straight, and even surfaces; free of voids throughout the length of ducts and fittings. Install insulation materials, vapor barriers or retarders, jackets, and thicknesses required for each item of duct system as specified in insulation system schedules. Install accessories compatible with insulation materials and suitable for the service. Install accessories that do not corrode, soften, or otherwise attack insulation or jacket in either wet or dry state. Install insulation with longitudinal seams at top and bottom of horizontal runs. Install multiple layers of insulation with longitudinal and end seams staggered. Keep insulation materials dry during application and finishing. Install insulation with tight longitudinal seams and end joints. Bond seams and joints with adhesive recommended by insulation material manufacturer. Install insulation with least number of joints practical. Where vapor barrier is indicated, seal joints, seams, and penetrations in insulation at hangers, supports, anchors, and other projections with vapor-barrier mastic. 1. Install insulation continuously through hangers and around anchor attachments. 2. For insulation application where vapor barriers are indicated, extend insulation on anchor legs from point of attachment to supported item to point of attachment to structure. Taper and seal ends at attachment to structure with vapor-barrier mastic. PWA I 6 DUCT INSULATION

23 3. Install inset1 materials and install insulation to tightly join the insert. Seal insulation to insulation inserts with adhesive or sealing compound recommended by insulation material manufacturer. J. Apply adhesives, mastics, and sealants at manufacturer's recommended coverage rate and wet and dry film thicknesses. K. Install insulation with factory-applied jackets as follows: 1. Draw jacket tight and smooth. 2. Cover circumferential joints with 3-inch- wide strips, of same material as insulation jacket. Secure strips with adhesive and outward clinching staples along both edges of strip, spaced 4 inches o.c. 3. Overlap jacket longitudinal seams at least 1-1/2 inches. Clean and dry surface to receive self-sealing lap. Staple laps with outward clinching staples along edge at [2 inches] [ 4 inches] o.c. a. For below ambient services, apply vapor-barrier mastic over staples. 4. Cover joints and seams with tape, according to insulation material manufacturer's written instructions, to maintain vapor seal. 5. Where vapor barriers are indicated, apply vapor-barrier mastic on seams and joints and at ends adjacent to duct flanges and fittings. L. Cut insulation in a manner to avoid compressing insulation more than 75 percent of its nominal thickness. M. Finish installation with systems at operating conditions. Repair joint separations and cracking due to thermal movement. N. Repair damaged insulation facings by applying same facing material over damaged areas. Extend patches at least 4 inches beyond damaged areas. Adhere, staple, and seal patches similar to butt joints. 3.3 PENETRATIONS A. Insulation Installation at Roof Penetrations: Install insulation continuously through roof penetrations. 1. Seal penetrations with flashing sealant. 2. For applications requiring only indoor insulation, terminate insulation above roof surface and seal with joint sealant. For applications requiring indoor and outdoor insulation, install insulation for outdoor applications tightly joined to indoor insulation ends. Seal joint with joint sealant. 3. Extend jacket of outdoor insulation outside roof flashing at least 2 inches below top of roof flashing. 4. Seal jacket to roof flashing with flashing sealant. B. Insulation Installation at Aboveground Exterior Wall Penetrations: Install insulation continuously through wall penetrations. PWA I 7 DUCT INSULATION

24 1. Seal penetrations with flashing sealant. 2. For applications requiring only indoor insulation, terminate insulation inside wall surface and seal with joint sealant. For applications requiring indoor and outdoor insulation, install insulation for outdoor applications tightly joined to indoor insulation ends. Seal joint with joint sealant. 3. Extend jacket of outdoor insulation outside wall flashing and overlap wall flashing at least 2 inches. 4. Seal jacket to wall flashing with flashing sealant. C. Insulation Installation at Interior Wall and Partition Penetrations (That Are Not Fire Rated): Install insulation continuously through walls and partitions. D. Insulation Installation at Fire-Rated Wall and Partition Penetrations: Terminate insulation at fire damper sleeves for fire-rated wall and partition penetrations. Externally insulate damper sleeves to match adjacent insulation and overlap duct insulation at least 2 inches. 1. Comply with requirements in Section "Penetration Fit estopping" for firestopping and fire-resistive joint sealers. E. Insulation Installation at Floor Penetrations: 1. Duct: For penetrations through fire-rated assemblies, terminate insulation at fire damper sleeves and externally insulate damper sleeve beyond floor to match adjacent duct insulation. Overlap damper sleeve and duct insulation at least 2 inches. 2. Seal penetrations through fire-rated assemblies. Comply with requirements in Section "Penetration Firestopping." 3.4 A. INSTALLATION OF MINERAL-FIBER INSULATION Blanket Insulation Installation on Ducts and Plenums: Secure with adhesive and insulation pins. 1. Apply adhesives according to manufacturer's recommended coverage rates per unit area, for 50 percent coverage of duct and plenum surfaces. 2. Apply adhesive to entire circumference of ducts and to all surfaces of fittings and transitions. 3. Install either capacitor-discharge-weld pins and speed washers or cupped-head, capacitordischarge-weld pins on sides and bottom of horizontal ducts and sides of vertical ducts as follows: a. On duct sides with dimensions 18 inches and smaller, place pins along longitudinal centerline of duct. Space 3 inches maximum from insulation end joints, and 16 inches o.c. b. On duct sides with dimensions larger than 18 inches, place pins 16 inches o.c. each way, and 3 inches maximum from insulation joints. Install additional pins to hold insulation tightly against surface at cross bracing. c. Pins may be omitted from top surface of horizontal, rectangular ducts and plenums. d. Do not overcompress insulation during installation. e. Impale insulation over pins and attach speed washers. PWA /8 DUCT INSULATION

25 f. Cut excess portion of pins extending beyond speed washers or bend parallel with insulation surface. Cover exposed pins and washers with tape matching insulation facing. 4. For ducts and plenums with surface temperatures below ambient, install a continuous unbroken vapor barrier. Create a facing lap for longitudinal seams and end joints with insulation by removing 2 inches from one edge and one end of insulation segment. Secure laps to adjacent insulation section with 1/2-inch outward-clinching staples, 1 inch o.c. Install vapor barrier consisting of factory- or field-applied jacket, adhesive, vaporbarrier mastic, and sealant at joints, seams, and protrusions. a. Repair punctures, tears, and penetrations with tape or mastic to maintain vaporbarrier seal. b. Install vapor stops for ductwork and plenums operating below 50 deg F at 18-foot intervals. Vapor stops shall consist of vapor-barrier mastic applied in a Z-shaped pattern over insulation face, along butt end of insulation, and over the surface. Cover insulation face and surface to be insulated a width equal to two times the insulation thickness, but not less than 3 inches. 5. Overlap unfaced blankets a minimum of 2 inches on longitudinal seams and end joints. At end joints, secure with steel bands spaced a maximum of 18 inches o.c. 6. Install insulation on rectangular duct elbows and transitions with a full insulation section for each surface. Install insulation on round and flat-oval duct elbows with individually mitered gores cut to fit the elbow. 7. Insulate duct stiffeners, hangers, and flanges that protrude beyond insulation surface with 6-inch- wide strips of same material used to insulate duct. Secure on alternating sides of stiffener, hanger, and flange with pins spaced 6 inches o.c. 3.5 A. B. C. FIRE-RATED INSULATION SYSTEM INSTALLATION Where fire-rated insulation system is indicated, secure system to ducts and duct hangers and supports to maintain a continuous fire rating. Insulate duct access panels and doors to achieve same fire rating as duct. Install firestopping at penetrations through fire-rated assemblies. Fire-stop systems are specified in Section "Penetration Firestopping." 3.6 A. B. FIELD QUALITY CONTROL Perform tests and inspections. Tests and Inspections: 1. Inspect ductwork, randomly selected by Architect, by removing field-applied jacket and insulation in layers in reverse order of their installation. Extent of inspection shall be limited to one location(s) for each duct system defined in the "Duct Insulation Schedule, General" Article. PWA /9 DUCT INSULATION

26 C. All insulation applications will be considered defective Work if sample inspection reveals noncompliance with requirements. 3.7 DUCT INSULATION SCHEDULE, GENERAL A. Plenums and Ducts Requiring Insulation: 1. Indoor, concealed supply and outdoor air. 2. Indoor, concealed return located in unconditioned space. 3. Indoor, concealed exhaust between isolation damper and penetration of building exterior. B. Items Not Insulated: 1. Fibrous-glass ducts. 2. Metal ducts with duct liner of sufficient thickness to comply with energy code and ASHRAE/IESNA Factory-insulated flexible ducts. 4. Factory-insulated plenums and casings. 5. Flexible connectors. 6. Vibration-control devices. 7. Factory-insulated access panels and doors. 3.8 INDOOR DUCT AND PLENUM INSULATION SCHEDULE A. Concealed, Supply-Air and Return-Air Duct and Plenum Insulation: Mineral-fiber blanket, 1-1/2 inches thick and 1.5-lb/cu. ft. nominal density. B. Concealed, Outdoor-Air Duct and Plenum Insulation: Mineral-fiber blanket, 2 inches thick and 1.5-lb/cu. ft. nominal density. C. Concealed, Exhaust-Air Duct and Plenum Insulation: Mineral-fiber blanket, 1-1/2 inches thick and 1.5-lb/cu. ft. nominal density. END OF SECTION PWA I 10 DUCT INSULATION

27 SECTION HVAC PIPING INSULATION PART 1- GENERAL 1.1 SUMMARY A. Section includes insulating the following HV AC piping systems: 1. Refrigerant suction and hot-gas piping, indoors and outdoors. 1.2 ACTION SUBMITTALS A. Product Data: For each type of product indicated. 1.3 INFORMATIONAL SUBMITTALS A. Field quality-control reports. 1.4 QUALITY ASSURANCE A. Surface-Burning Characteristics: For insulation and related materials, as determined by testing identical products according to ASTM E 84, by a testing and inspecting agency acceptable to authorities having jurisdiction. Factory label insulation and jacket materials and adhesive, mastic, tapes, and cement material containers, with appropriate markings of applicable testing agency. 1. Insulation Installed Indoors: Flame-spread index of 25 or less, and smoke-developed index of 50 or less. 2. Insulation Installed Outdoors: Flame-spread index of 75 or less, and smoke-developed index of 150 or less. PART 2- PRODUCTS 2.1 INSULATION MATERIALS A. Products shall not contain asbestos, lead, mercury, or mercury compounds. B. Products that come in contact with stainless steel shall have a leachable chloride content of less than 50 ppm when tested according to ASTM C 871. C. Insulation materials for use on austenitic stainless steel shall be qualified as acceptable according to ASTM C 795. PWA /1 HVAC PIPING INSULATION

28 D. Foam insulation materials shall not use CFC or HCFC blowing agents in the manufacturing process. E. Flexible Elastomeric Insulation: Closed-cell, sponge- or expanded-rubber materials. Comply with ASTM C 534, Type I for tubular materials. I. Products: Subject to compliance with requirements, available products that may be incorporated into the Work include, but are not limited to, the following: a. Aeroflex USA, Inc.; Aerocel. b. Armacell LLC; AP Armaflex. c. K-Flex USA; Insul-Lock, Insul-Tube, and K-FLEX LS. F. Polyolefin: Unicellular, polyethylene thermal plastic insulation. Comply with ASTM C 534 or ASTM C 1427, Type I, Grade 1 for tubular materials and Type II, Grade 1 for sheet materials. 1. Products: Subject to compliance with requirements, available products that may be incorporated into the Work include, but are not limited to, the following: a. Armacell LLC; Tubolit. b. Nomaco Insulation; IMCOLOCK, IMCOSHEET, NOMALOCK, and NOMAPLY. 2.2 ADHESIVES A. Materials shall be compatible with insulation materials, jackets, and substrates and for bonding insulation to itself and to surfaces to be insulated unless otherwise indicated. B. Flexible Elastomeric and Polyolefin Adhesive: Comply with MIL-A-24179A, Type II, Class I. 1. Products: Subject to compliance with requirements, available products that may be incorporated into the Work include, but are not limited to, the following: a. Aeroflex USA, Inc.; Aeroseal. b. Armacell LLC; Armaflex 520 Adhesive. c. Foster Brand, Specialty Construction Brands, Inc., a business of H. B. Fuller Company; d. K-Flex USA; R-373 Contact Adhesive. 2. For indoor applications, adhesive shall have a VOC content of 50 gil or less when calculated according to 40 CFR 59, Subpart D (EPA Method 24). 3. Adhesive shall comply with the testing and product requirements of the California Depmiment of Health Services' "Standard Practice for the Testing of Volatile Organic Emissions from Various Sources Using Small-Scale Environmental Chambers." 2.3 PREPARATION A. Surface Preparation: Clean and dry surfaces to receive insulation. adversely affect insulation application. PWA Remove materials that will /2 HVAC PIPING INSULATION

29 B. Coordinate insulation installation with the trade installing heat tracing. Comply with requirements for heat tracing that apply to insulation. C. Mix insulating cements with clean potable water; if insulating cements are to be in contact with stainless-steel surfaces, use demineralized water. 2.4 GENERAL INSTALLATION REQUIREMENTS A. B. c. D. E. F. G. H. I. J. Install insulation materials, accessories, and finishes with smooth, straight, and even surfaces; free of voids throughout the length of piping including fittings, valves, and specialties. Install insulation materials, forms, vapor barriers or retarders, jackets, and thicknesses required for each item of pipe system as specified in insulation system schedules. Install accessories compatible with insulation materials and suitable for the service. Install accessories that do not corrode, soften, or otherwise attack insulation or jacket in either wet or dry state. Install insulation with longitudinal seams at top and bottom of horizontal runs. Install multiple layers of insulation with longitudinal and end seams staggered. Do not weld brackets, clips, or other attachment devices to piping, fittings, and specialties. Keep insulation materials dry during application and finishing. Install insulation with tight longitudinal seams and end joints. Bond seams and joints with adhesive recommended by insulation material manufacturer. Install insulation with least number of joints practical. Where vapor barrier is indicated, seal joints, seams, and penetrations in insulation at hangers, supports, anchors, and other projections with vapor-barrier mastic. 1. Install insulation continuously through hangers and around anchor attachments. 2. For insulation application where vapor barriers are indicated, extend insulation on anchor legs from point of attachment to supported item to point of attachment to structure. Taper and seal ends at attachment to structure with vapor-barrier mastic. 3. Install insert materials and install insulation to tightly join the insert. Seal insulation to insulation inserts with adhesive or sealing compound recommended by insulation material manufacturer. 4. Cover inserts with jacket material matching adjacent pipe insulation. Install shields over jacket, arranged to protect jacket from tear or puncture by hanger, support, and shield. K. Apply adhesives, mastics, and sealants at manufacturer's recommended coverage rate and wet and dry film thicknesses. L. Cut insulation in a manner to avoid compressing insulation more than 75 percent of its nominal thickness. PWA /3 HVAC PIPING INSULATION

30 M. Finish installation with systems at operating conditions. Repair joint separations and cracking due to thermal movement. N. Repair damaged insulation facings by applying same facing material over damaged areas. Extend patches at least 4 inches beyond damaged areas. Adhere, staple, and seal patches similar to butt joints. 0. For above-ambient services, do not install insulation to the following: 1. Vibration-control devices. 2. Testing agency labels and stamps. 3. Nameplates and data plates. 4. Manholes. 5. Handholes. 6. Cleanouts. 2.5 A. PENETRATIONS Insulation Installation at Underground Exterior Wall Penetrations: Terminate insulation flush with sleeve seal. Seal terminations with flashing sealant. B. Insulation Installation at Aboveground Exterior Wall Penetrations: continuously through wall penetrations. Install insulation 1. Seal penetrations with flashing sealant. 2. For applications requiring only indoor insulation, terminate insulation inside wall surface and seal with joint sealant. For applications requiring indoor and outdoor insulation, install insulation for outdoor applications tightly joined to indoor insulation ends. Seal joint with joint sealant. 3. Extend jacket of outdoor insulation outside wall flashing and overlap wall flashing at least 2 inches. 4. Seal jacket to wall flashing with flashing sealant. C. Insulation Installation at Interior Wall and Partition Penetrations (That Are Not Fire Rated): Install insulation continuously through walls and partitions. D. Insulation Installation at Fire-Rated Wall and Partition Penetrations: Install insulation continuously through penetrations of fire-rated walls and patiitions. 1. Comply with requirements in Section "Penetration Firestopping" for firestopping and fire-resistive joint sealers. 2.6 GENERAL PIPE INSULATION INSTALLATION A. Requirements in this article generally apply to all insulation materials except where more specific requirements are specified in various pipe insulation material installation articles. B. Insulation Installation on Fittings, Valves, Strainers, Flanges, and Unions: PWA /4 HVAC PIPING INSULATION

31 1. Install insulation over fittings, valves, strainers, flanges, unions, and other specialties with continuous thermal and vapor-retarder integrity unless otherwise indicated. 2. Insulate pipe elbows using preformed fitting insulation or mitered fittings made from same material and density as adjacent pipe insulation. Each piece shall be butted tightly against adjoining piece and bonded with adhesive. Fill joints, seams, voids, and irregular surfaces with insulating cement finished to a smooth, hard, and uniform contour that is uniform with adjoining pipe insulation. 3. Insulate tee fittings with preformed fitting insulation or sectional pipe insulation of same material and thickness as used for adjacent pipe. Cut sectional pipe insulation to fit. Butt each section closely to the next and hold in place with tie wire. Bond pieces with adhesive. 4. Cover segmented insulated surfaces with a layer of finishing cement and coat with a mastic. Install vapor-barrier mastic for below-ambient services and a breather mastic for above-ambient services. Reinforce the mastic with fabric-reinforcing mesh. Trowel the mastic to a smooth and well-shaped contour. 5. For services not specified to receive a field-applied jacket except for flexible elastomeric and polyolefin, install fitted PVC cover over elbows, tees, and unions. Terminate ends with PVC end caps. Tape PVC covers to adjoining insulation facing using PVC tape. 6. Stencil or label the outside insulation jacket of each union with the word "union." Match size and color of pipe labels. c. Insulate instrument connections for thermometers, pressure gages, pressure temperature taps, test connections, flow meters, sensors, switches, and transmitters on insulated pipes. Shape insulation at these connections by tapering it to and around the connection with insulating cement and finish with finishing cement, mastic, and flashing sealant. 2.7 A. B. INSTALLATION OF FLEXIBLE ELASTOMERIC INSULATION Seal longitudinal seams and end joints with manufacturer's recommended adhesive to eliminate openings in insulation that allow passage of air to surface being insulated. Insulation Installation on Pipe Flanges: 1. Install pipe insulation to outer diameter of pipe flange. 2. Make width of insulation section same as overall width of flange and bolts, plus twice the thickness of pipe insulation. 3. Fill voids between inner circumference of flange insulation and outer circumference of adjacent straight pipe segments with cut sections of sheet insulation of same thickness as pipe insulation. 4. Secure insulation to flanges and seal seams with manufacturer's recommended adhesive to eliminate openings in insulation that allow passage of air to surface being insulated. C. Insulation Installation on Pipe Fittings and Elbows: I. Install mitered sections of pipe insulation. 2. Secure insulation materials and seal seams with manufacturer's recommended adhesive to eliminate openings in insulation that allow passage of air to surface being insulated. D. Insulation Installation on Valves and Pipe Specialties: PWA /5 HVAC PIPING INSULATION

32 1. Install preformed valve covers manufactured of same material as pipe insulation when available. 2. When preformed valve covers are not available, install cut sections of pipe and sheet insulation to valve body. Arrange insulation to permit access to packing and to allow valve operation without disturbing insulation. 3. Install insulation to flanges as specified for flange insulation application. 4. Secure insulation to valves and specialties and seal seams with manufacturer's recommended adhesive to eliminate openings in insulation that allow passage of air to surface being insulated. 2.8 A. INSTALLATION OF POL YOLEFIN INSULATION Insulation Installation on Straight Pipes and Tubes: 1. Seal split-tube longitudinal seams and end joints with manufacturer's recommended adhesive to eliminate openings in insulation that allow passage of air to surface being insulated. B. Insulation Installation on Pipe Flanges: 1. Install pipe insulation to outer diameter of pipe flange. 2. Make width of insulation section same as overall width of flange and bolts, plus twice the thickness of pipe insulation. 3. Fill voids between inner circumference of flange insulation and outer circumference of adjacent straight pipe segments with cut sections of polyolefin sheet insulation of same thickness as pipe insulation. 4. Secure insulation to flanges and seal seams with manufacturer's recommended adhesive to eliminate openings in insulation that allow passage of air to surface being insulated. C. Insulation Installation on Pipe Fittings and Elbows: 1. Install mitered sections of polyolefin pipe insulation. 2. Secure insulation materials and seal seams with manufacturer's recommended adhesive to eliminate openings in insulation that allow passage of air to surface being insulated. D. Insulation Installation on Valves and Pipe Specialties: 1. Install cut sections ofpolyolefin pipe and sheet insulation to valve body. 2. Arrange insulation to permit access to packing and to allow valve operation without disturbing insulation. 3. Install insulation to flanges as specified for flange insulation application. 4. Secure insulation to valves and specialties, and seal seams with manufacturer's recommended adhesive to eliminate openings in insulation that allow passage of air to surface being insulated. 2.9 FINISHES A. Flexible Elastomeric Thermal Insulation: After adhesive has fully cured, apply two coats of insulation manufacturer's recommended protective coating. PWA /6 HVAC PIPING INSULATION

33 B. Color: Final color as selected by Architect. Vary first and second coats to allow visual inspection of the completed Work. C. Do not field paint aluminum or stainless-steel jackets FIELD QUALITY CONTROL A. All insulation applications will be considered defective Work if sample inspection reveals noncompliance with requirements PIPING INSULATION SCHEDULE, GENERAL A. Acceptable preformed pipe and tubular insulation materials and thicknesses are identified for each piping system and pipe size range. If more than one material is listed for a piping system, selection from materials listed is Contractor's option. B. Items Not Insulated: Unless otherwise indicated, do not install insulation on the following: 1. Drainage piping located in crawl spaces. 2. Underground piping. 3. Chrome-plated pipes and fittings unless there is a potential for personnel injmy INDOOR PIPING INSULATION SCHEDULE A. Refrigerant Suction and Hot-Gas Flexible Tubing: Flexible elastomeric or Polyolefin, 1 inch thick OUTDOOR, ABOVEGROUND PIPING INSULATION SCHEDULE A. Refrigerant Suction and Hot-Gas Piping: Insulation shall be one of the following: 1. Flexible Elastomeric: 2 inches thick. 2. Polyolefin: 2 inches thick. B. Refrigerant Suction and Hot-Gas Flexible Tubing: Insulation shall be one of the following: 1. Flexible Elastomeric: 2 inches thick. 2. Polyolefin: 2 inches thick FIELD-APPLIED JACKET SCHEDULE A. Install jacket over insulation material. For insulation with factoty-applied jacket, install the field-applied jacket over the factory-applied jacket. B. If more than one material is listed, selection from materials listed is Contractor's option. C. Piping, Concealed: 1. None. D. Piping, Exposed: 1. PVC, white color. E. Fittings, Exposed: PWA /7 HVAC PIPING INSULATION

34 1. PVC Pre-formed fitting covers, white color. F. Piping and Fittings, outdoor: 1. Treat PVC jacket and fitting covers with UV resistant coating. G. Exposed piping in mechanical rooms and outdoors at all elevations shall be jacketed. Exposed piping in all other spaces at elevations at or below 8' -0" AFF shall be jacketed. END OF SECTION PWA /8 HVAC PIPING INSULATION

35 SECTION CONTROL SYSTEMS PART 1 GENERAL 1.01 SUMMARY A. Temperature Controls work shall be by a sole source vendor, and shall be based on Automated Logic Controls. The temperature control contractor shall be Automatic Controls Equipment Systems, Inc. (ACES), contact Mr. Justin Vogt (314) ACES's work and pricing shall be included as a sub-contractor to the Mechanical Contractor. The Mechanical Contractor is responsible for the coordination of this sub-contractor's work with all trades, as he would be with other sub-contractors. B. Equipment shall not be provided with 'factory' controls, other than those provided by ACES. Shop fabricated equipment may factory mount controls that are provided by ACES, or ACES may field install such devices. This must be coordinated between suppliers and ACES prior to bidding such that the most cost effective option is used, and all associated work and costs are included in the bid price, while obtaining the lowest installed cost system for the owner. This does not apply to packaged chillers or Variable Refrigerant Flow (VRF) systems, which shall be provided with the manufacturers standard control system. However, this control system must communicate with the ACES system via a BACNET interface. C. This section contains requirements for pneumatic, electric and digital control systems as indicated on the contract drawings. D. Contractor is responsible for providing, installing and connecting all sensors, pneumatic or electric actuators, control valves, control dampers, electrical components and all interconnecting pneumatic tubing and electrical wiring between these devices and up to the Direct Digital Controller (DDC), except where indicated. E. Demolition: The contractor shall notify the Owner prior to demolition or removal of controls. Owner may elect to keep these control devices for their stock. F. DDC controllers shall consist of Automated Logic Controls. Controllers will be furnished and installed by ACES. G. Once each mechanical system is completely operational under the new control system, contractor shall remove all unused sensors, operators, panels, wiring, tubing, conduit, etc. Owner shall have the option of retaining any removed control items FOR VRF SYSTEMS A. For VRF Systems, a complete control system shall be provided by Automated Logic (ACES) with Variable Refrigerant Flow (VRF) system interface. 1. Electrical Contractor shall provide Ethernet drops to gateways. 2. Static IP address/gateway address for each gateway will be provided by owner. B. ACES shall provide the following items: 1. Communication wiring between the VRF gateway and the heat recovery units condensing units (CU's). 2. Communication wiring between the CU's and the zone controllers. 3. Interlock wiring between the zone controllers and the Fan Coil Units (FCU's) and CMC's in each room. 4. ALC communication controllers. (LGR250 or LGRlOOO depending upon the total number of interface points.) PWA /1 CONTROL SYSTEMS

36 5. Programming, graphics, stattup on the ALC system to control and monitor all of the available VRF equipment. 6. All wiring and conduit. C. VRF vendor shall provide the following items: 1. OMS BACnet Gateway controllers to communicate will all of the VRF equipment. 2. Startup and checkout services for the OMS BACnet Gateway. 3. Setup and commissioning of the local zone controllers for each VRF system. This includes addressing the controllers and setting system parameters. 4. Complete list of all Bacnet control points for all VRF equipment provided. 5. Wiring instruction on all interlock wiring required between the local controllers, CU's and the OMS BACnet Gateways. D. Warranty- The Controls system warranty period shall begin at the time the control system has been shown to the satisfaction of the engineer to function properly as described in Spec. Section QUALITY ASSURANCE A. Contractor's Qualifications: 1. Contractor shall be regularly engaged in the installation of digital control systems and equipment, of types and sizes required. Contractor shall have a minimum of five years experience installing digital control systems. Contractor shall supply sufficient and competent supervision and personnel throughout the project in accordance with General Conditions section and B. Codes and Standards: 1. Electrical Standards: Provide electrical components of control systems which have been UL-listed and labeled, and comply with NEMA standards. 2. NEMA Compliance: Comply with NEMA standards pertaining to components and devices for control systems. 3. NFP A Compliance: Comply with NFP A 90A "Standard for the Installation of Air Conditioning and Ventilating Systems" where applicable to controls and control sequences. 4. NFPA Compliance: Comply with NFPA 70 "National Electric Code" SUBMITTALS A. Shop Drawings: Submit shop drawings for each control system, containing the following information: B. Product data for each damper, valve and control device. C. Schematic flow diagrams of system showing fans, pumps, coils, dampers, valves and control devices. D. Label each control device with setting or adjustable range of control. E. Indicate all required electrical wiring. Clearly differentiate between pottions of wiring that are factory-installed and portions to be field-installed. F. Provide details of faces on control panels, including controls, instruments, and labeling. G. Include written description of sequence of operation. H. Shop drawing showing field wiring control air tubing provided and installed by contractor. I. See General and Special Conditions for submittal requirements and procedures. PWA /2 CONTROL SYSTEMS

37 PART 2 PRODUCTS 2.01 MATERIALS AND EQUIPMENT A. Conduit and Raceway: 1. Electrical Metallic Tubing: EMT and fittings shall conform to ANSI C Surface Metal Raceway and Fittings: Wiremold 500, Ivory, or approved equal. 3. Flexible Metal Conduit: Indoors, per National Electric Code for connection to moving or vibrating equipment. B. Electronic Temperature Sensors: 1. Air and Hot Water Temperature Sensors: a. All electronic temperature sensors shall be compatible with Automated Logic Controls systems. b. Sensors shall be 1,000 ohm platinum, resistance temperature detectors (RTDs) with two wire connections. Duct mounted sensors shall be averaging type. Contractor may install probe type when field conditions prohibit averaging type, but must receive permission from Owner's Representative. C. Current Switch: 1. Current switches for fan and pump status must have an adjustable trip setpoint with LED indication and be capable of detecting broken belts or couplings. 2. Current switches on motors equipped with VFD's must be capable of detecting status down to 6Hz. Units shall be powered by monitored line, UL listed and CE certified, and have a five year warranty. a. Kele, Hawkeye or approved equal. D Electronic Airflow Transducers: 1. Provide individual airflow transducers, especially selected for the required spans of each of the above primary elements, and in accordance with the following. 2. The Electronic Transducer(s) shall be solid state analog electronic type, with infinite resolution capable of performing dedicated volume indication and transition. Microprocessor based transducers with time sharing of multiple square root extractors and/or controllers are not acceptable. 3. The transducer( s) shall be housed in a NEMA 1 enclosure with internal terminal strip for field wiring, and power and output signal conduit connection port. 4. Each transducer's output shall not be affected by direction of mounting (attitude) or external vibrations, and shall be furnished with a factory calibrated span. 5. Electronic transducers shall operate on 16 to 36 VDC. 6. Transducer(s) shall have outputs of 4 to 20 ma/2-wire or 0-5V AC/3-wire. 7. Each transducer shall be provided with an indicating meter operating independent of all other control devices, and providing direct readout of the air volume as derived from the total and static input signals received from its' respective air flow measuring element. The top scale shall indicate the measured air volume in units of cubic feet per minute (CFM), and the bottom scale shall indicate the air velocity in units of feet per minute (FPM). The meter shall be a differential pressure type that is diaphragm actuated, and is to be flush mounted on the enclosure door. The meter shall be calibrated to an accuracy of +2% of span. 8. Airflow Transducers for Applications Having Operating Velocities Below 1266 Feet Per Minute: a. Shall provide local indication, electronic conversion of the pneumatic velocity pressure input signals, square root extraction/linearization of the velocity pressure PWA /3 CONTROL SYSTEMS

38 signal, noise filtration, auto zeroing, and an analog output signal linear to air volume for further processing and/or automation system usage. b. The automatic zeroing circuit shall be capable of maintaining the transducer output to within + 0.1% of value, and shall be field configurable for frequency of activation between one and seventy two hours. The transducer output shall be locked and maintained at the last given output value during the automatic zeroing period so as not to interrupt the automatic control process. c. The local indicating meter shall be one half inch high, three and one half digit light emitting diode (LED) type. The LED shall indicate the measured air volume in engineering units of cubic feet per minute (CFM). The meter shall be auto calibrated to an accuracy of+ 1 count. d. The transducer, square root extractor, noise filters, auto zeroing, local indicating meter and output scaling circuits of this device shall operate on 18V to 38V ac/dc power. The analog output signal shall be linear to air volume which is factory set for a full scale value equal to 110% of the maximum design capacity of the flow measuring element served for variable air volume applications, or 200% of the design operating value for constant volume applications. e. Transducer range shall match the velocity pressure at the maximum design flow rate. f. Transducer performance shall be equal to, or better than, the following: Accuracy: % F.S.(Terminal Point) /+0.15% F.S. (BFSL) Hysteresis: % Repeatability: % Temperature Effects: % F.S./DF Over pressure: 10 PSIG Proof Response: < 0.25 seconds for full span input change Noise Filtration: Low Pass Filter, factory set@ 3.2Hz Power Requirement: Analog Output: 24V ac/dc 0-5V de, 0-1 OV de or 4-20mA linear to air volume and velocity. 9. Installation Considerations: a. Primary Elements shall be installed in strict accordance with the manufacture's published requirements, and with ASME guidelines effecting non-standard approach condition. These elements serve as the primary signals for the airflow systems; therefore, it shall be the responsibility of the contractor to verify and installation, to assure that accurate primary signals are obtained b. An identification label shall be placed on each primary flow element showing airflow direction and listing the Model No.; System Served, Size and Identifying Tag No. c. An identification label shall be placed on each airflow indicating transducer listing, the Model No., Flow Elements Served, Full Scale Value, and Identifying Tag No. 10. Manufacturer: a. Primary flow elements, sensors, meters and transducers shall be Paragon Controls Inc. FIT-1003-DZV or approved equal. b. The naming of any manufacturer does not automatically constitute acceptance of this standard product nor waive their responsibility to comply totally with all requirements of the proceeding specification. E. Electrical Requirements: Provide electrical devices and relays that are UL-listed and of type PWA /4 CONTROL SYSTEMS

39 which meet current and voltage characteristics of the project. All devices shall be of industrial/commercial grade or better. Residential types will be rejected. 2. Relays: Relays shall have an LED status indicator, voltage transient suppression, Closed Open-Auto switch, plastic enclosure and color coded wires. Kele model RIBU1C or approved equal. PART 3 EXECUTION 3.01 INSTALLATION OF CONTROL SYSTEMS A. General: Install systems and materials in accordance with manufacturers instructions, roughingin drawings and details shown on drawings. C. Raceway: Raceway is to be installed in accordance with the National Electric Code. Use of flexible metal conduit or liquidtight flexible conduit is limited to 36" to connect from EMT to devices subject to movement. Flexible raceway is not to be used to compensate for misalignment of raceway during installation. D. Control Wiring: Install control wiring in raceway, without splices between terminal points, color-coded. Install in a neat workmanlike manner, securely fastened. Install in accordance with National Electrical Code. 1. Install circuits over 25-volt with color-coded No. 12 stranded wire. 2. Install electronic circuits and circuits under 25 volts with color-coded No. 18 twisted shielded pair type conductor. 3. N2 Communication Bus shall be No. 18 A WG, plenum rated, stranded twisted shielded, 3 conductor, with blue outer casing, descripted as OAS STR PLNM NEON BLU JK distributed by Windy City Wire, constructed by Cable-Tek, or approved equivalent. 4. Metastat wiring shall be minimum 20 A WG, plenum rated, 8 conductor stranded wire. 5. All control wiring at control panel shall be tagged and labeled during installation to assist owner in making termination connections at control panel. Label all control wires per bid documents. E. All low voltage electrical wiring shall be run as follows: 1. Route electrical wiring in concealed spaces whenever possible. 2. Provide EMT conduit and fittings in mechanical rooms and where indicated on drawings. 3. Low voltage electrical wiring routed above acoustical ceiling is not required to be in conduit, but wire must be plenum rated. Clip wire to structural ceiling. 4. Provide surface raceway, fittings and boxes in finished areas where wiring cannot be run in concealed spaces. Route on ceiling or along walls as close to ceiling as possible. Run raceway parallel to walls. Diagonal runs are not permitted. Paint raceway and fittings to match existing conditions. Patch/repair/paint any exposed wall penetrations to match existing conditions. F. All devices shall be mounted appropriately for the intended service and location. I. Wall mounted sensors and thermostats shall be provided with base and covers in occupied areas and mounted 4'-6" above finished floor. Tubing and or wiring shall be concealed within the wall up to the ceiling where ever possible. Surface raceway may only be used with approval of Owners Representative. 2. Duct mounted sensors shall be provided with mounting brackets to accommodate insulation. Mounting clips for capillary tubes for averaging sensors are required. 3. All control devices shall be tagged and labeled for future identification and servicing of control system ADJUSTING AND START-UP PWA /5 CONTROL SYSTEMS

40 A. Start-Up of equipment: The stmi-up, testing, and adjusting of pneumatic and digital control systems for the systems shall be completed by the contractor. The contractor shall notify the owner of dates and time of stmi up a minimum of 7 days prior to start up. The contractor shall coordinate with other trades as necessary to complete the start up process CLOSEOUT PROCEDURES A. Contractor shall provide complete diagrams of the control system including flow diagrams with each control device labeled, a diagram showing the termination connections, and an explanation ofthe control sequence. The diagram and sequence shall be framed and protected by glass and mounted next to controller SERVICE/WARRANTY A. System shall have a full parts and labor warranty for a period of two years. The warranty must be by the factory furnishing the equipment and not the mechanical contractor. END OF SECTION PWA /6 CONTROL SYSTEMS

41 SECTION CONTROL SEQUENCE A. Neutral Air Dual Wheel Unit (NAU-1) 1. Occupied mode - When the ERV is indexed to run the following shall occur: a. Outside air damper shall open. b. Return air damper shall close. c. Supply and exhaust fans shall be enabled to run. d. Total and Sensible energy wheels shall be enabled to run. 2. Supply fan operation a. After the supply fan vfd has been energized, the vfd speed signal shall be set to maintain the required Discharge Air Pressure at 1.5'' w.c. (adj). The vfd speed signal setpoint shall be determined by the Supply Duct Air Pressure sensor. 3. Exhaust fan operation a. After the exhaust fan vfd has been energized the vfd speed signal shall be set to 90% (adj) of the supply fan vfd signal. 4. Discharge air temperature control a. Discharge air setpoint shall be optimized as follows: 1. If over 90% (adj) of rooms served by the ERV are in cooling, then DAT SP = 60 deg. (adj) ii. Else, DAT SP= 72 deg (adj) b. Whenever the outside air temperature is above the discharge setpoint, the following shall occur: 1. Outdoor unit shall be commanded to the cooling mode. 11. Total and sensible wheels shall be enabled to run Cooling shall be enabled and modulate to maintain leaving coil discharge setpoint. c. Whenever the outside air temperature is below the discharge setpoint, the following shall occur: 1. Outdoor unit shall be commanded to the heating mode. 11. Total wheel shall be enabled to run Sensible wheel shall be disabled. IV. ECV's shall be enabled and modulate to maintain leaving coil discharge setpoint. 5. Dehumidification I Reheat Control PWA /1 CONTROL SEQUENCE

42 a. Unit shall be commanded to dehumidification mode when the total wheel leaving air humidity is above setpoint (50%, adj.) b. When in dehumidification mode the following shall occur: 1. Outdoor unit shall be commanded to the cooling mode. 11. Total and sensible wheels shall be enabled to run Cooling shall be enabled and modulate to maintain the leaving coil temperature at 55 F. The sensible wheel will reheat the leaving air temperature to max output of sensible ERV wheel. c. Unit shall return to normal operation when the total wheel leaving humidity drops 2% below the setpoint. 6. Energy recovery wheel defrost control a. Supply and exhaust fans shall continue to run. b. The total energy wheel shall stop jog for defrost. 7. Coil defrost control a. Coil defrost mode shall be initiated when the defrost contacts from the outdoor unit close. b. When in defrost mode the following shall occur: 1. Supply and exhaust fans shall be de-energized or brought to minimum airflow. 11. Outside air damper shall close to minimum position Return air damper shall open to maintain leaving air temperature. 1v. Total wheel shall be off. v. Sensible wheel shall be off. v1. Cooling shall remain on. 8. Alarms, interlocks and safeties a. The following conditions shall shutdown the ERV and shall indicate an alarm condition at the BAS workstation: 1. Abnormal supply fan operation. 11. Supply low limit fault. Supply air temperature below 60 F(adj.). b. The following conditions shall indicate an alarm at the BAS workstation, however the ERV shall continue to operate: 1. Abnormal exhaust fan operation. 11. Discharge air temperature is more than 10 F (adj.) above or below setpoint for more than 5 minutes. PWA /2 CONTROL SEQUENCE

43 c. In the event supply fan is not running (as indicated by the current sensing relay) exhaust fan shall be de-energized. d. Whenever the ERU is shutdown the following shall occur: 9. Unoccupied mode 1. The outside and return air dampers shall close. 11. All heating and cooling shall be de-energized Supply fan and exhaust fan vfd's shall be de-energized. IV. Energy recovery wheels shall be de-energized. a. Supply fan and exhaust fan vfd's shall be de-energized. b. The outside air and return air dampers shall be fully closed. c. All heating and cooling shall be off. d. Energy recovery wheels shall be de-energized. 10. Loss of communications: In the event the unit controller loses communications with the BAS it shall default to the occupied mode. B. Room Motorized Outside Air Dampers Minimum Outside Air Ventilation - Carbon Dioxide (C02) Control: When in the occupied mode, the BAS shall measure the C02 levels and modulate the motorized outside air dampers open on rising C02 concentrations. C02 setpoint of750 ppm (adj.). END OF SECTION PWA /3 CONTROL SEQUENCE

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45 SECTION FACILITY NATURAL-GAS PIPING PART 1- GENERAL 1.1 SUMMARY A. Section Includes: 1. Pipes, tubes, and fittings. 2. Piping specialties. 3. Piping and tubing joining materials. 4. Valves. 5. Pressure regulators. 1.2 PERFORMANCE REQUIREMENTS A. Minimum Operating-Pressure Ratings: 1. Piping and Valves: 100 psig minimum unless otherwise indicated. 2. Service Regulators: 100 psig minimum unless otherwise indicated. B. Natural-Gas System Pressures within Buildings: Two pressure ranges. Primary pressure is more than 0.5 psig but not more than 2 psig, and is reduced to secondary pressure of 0.5 psig or less. 1.3 ACTION SUBMITTALS A. Product Data: For each type of product indicated. B. Shop Drawings: For facility natural-gas piping layout. Include plans, piping layout and elevations, sections, and details for fabrication of pipe anchors, hangers, supports for multiple pipes, alignment guides, expansion joints and loops, and attachments of the same to building structure. Detail location of anchors, alignment guides, and expansion joints and loops. 1.4 INFORMATIONAL SUBMITTALS A. Welding certificates. B. Field quality-control reports. 1.5 CLOSEOUT SUBMITTALS A. Operation and maintenance data. PWA /1 FACILITY NATURAL-GAS PIPING

46 1.6 QUALITY ASSURANCE A. Steel Support Welding Qualifications: Qualify procedures and personnel according to AWS Dl.l/Dl.1M, "Structural Welding Code- Steel." B. Pipe Welding Qualifications: Qualify procedures and operators according to ASME Boiler and Pressure Vessel Code. C. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFP A 70, by a qualified testing agency, and marked for intended location and application. PART 2- PRODUCTS 2.1 PIPES, TUBES, AND FITTINGS A. Steel Pipe: ASTM A 53/A 53M, black steel, Schedule 40, Type E or S, Grade B. 1. Malleable-Iron Threaded Fittings: ASME B 16.3, Class 150, standard pattern. 2. Wrought-Steel Welding Fittings: ASTM A 234/A 234M for butt welding and socket welding. 3. Unions: ASME B16.39, Class 150, malleable iron with brass-to-iron seat, ground joint, and threaded ends. 4. Protective Coating for Underground Piping: Factory-applied, three-layer coating of epoxy, adhesive, and PE. a. Joint Cover Kits: Epoxy paint, adhesive, and heat-shrink PE sleeves. B. Corrugated, Stainless-Steel Tubing: Comply with ANSI/lAS LC Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: a. OmegaFlex, Inc. b. Parker Hannifin Corporation. c. Tru-Flex Metal Hose Corp. 2. Tubing: ASTM A 240/A 240M, corrugated, Series 300 stainless steel. 3. Coating: PE with flame retardant. a. Surface-Burning Characteristics: As determined by testing identical products according to ASTM E 84 by a qualified testing agency. Identify products with appropriate markings of applicable testing agency. 1) Flame-Spread Index: 25 or less. 2) Smoke-Developed Index: 50 or less. 4. Fittings: Copper-alloy mechanical fittings with ends made to fit and listed for use with corrugated stainless-steel tubing and capable of metal-to-metal seal without gaskets. Include brazing socket or threaded ends complying with ASME B PWA /2 FACILITY NATURAL-GAS PIPING

47 5. Striker Plates: Steel, designed to protect tubing from penetrations. 6. Manifolds: Malleable iron or steel with factory-applied protective coating. Threaded connections shall comply with ASME B for pipe inlet and corrugated tubing outlets. 7. Operating-Pressure Rating: 5 psig. C. PE Pipe: ASTM D 2513, SDR PE Fittings: ASTM D 2683, socket-fusion type or ASTM D 3261, butt-fusion type with dimensions matching PE pipe. 2. PE Transition Fittings: Factory-fabricated fittings with PE pipe complying with ASTM D 2513, SDR 11; and steel pipe complying with ASTM A 53/A 53M, black steel, Schedule 40, Type E or S, Grade B. 3. Anodeless Service-Line Risers: Factory fabricated and leak tested. a. Underground Portion: PE pipe complying with ASTM D 2513, SDR 11 inlet. b. Casing: Steel pipe complying with ASTM A 53/A 53M, Schedule 40, black steel, Type E or S, Grade B, with corrosion-protective coating covering. Vent casing aboveground. c. Aboveground Portion: PE transition fitting. d. Outlet shall be threaded or suitable for welded connection. e. Tracer wire connection. f. Ultraviolet shield. g. Stake supports with factory finish to match steel pipe casing or carrier pipe. 4. Transition Service-Line Risers: Factory fabricated and leak tested. a. Underground Portion: PE pipe complying with ASTM D 2513, SDR 11 inlet connected to steel pipe complying with ASTM A 53/A 53M, Schedule 40, Type E or S, Grade B, with corrosion-protective coating for aboveground outlet. b. Outlet shall be threaded or suitable for welded connection. c. Bridging sleeve over mechanical coupling. d. Factory-connected anode. e. Tracer wire connection. f. Ultraviolet shield. g. Stake supports with factory finish to match steel pipe casing or carrier pipe. 2.2 PIPING SPECIALTIES A. Appliance Flexible Connectors: 1. Indoor, Fixed-Appliance Flexible Connectors: Comply with ANSI Z Indoor, Movable-Appliance Flexible Connectors: Comply with ANSI Z Outdoor, Appliance Flexible Connectors: Comply with ANSI Z Corrugated stainless-steel tubing with polymer coating. 5. Operating-Pressure Rating: 0.5 psig. 6. End Fittings: Zinc-coated steel. 7. Threaded Ends: Comply with ASME B Maximum Length: 72 inches PWA /3 FACILITY NATURAL-GAS PIPING

48 B. Quick-Disconnect Devices: Comply with ANSI Z Copper-alloy convenience outlet and matching plug connector. 2. Nitrile seals. 3. Hand operated with automatic shutoff when disconnected. 4. For indoor or outdoor applications. 5. Adjustable, retractable restraining cable. C. Weatherproof Vent Cap: Cast- or malleable-iron increaser fitting with corrosion-resistant wire screen, with free area at least equal to cross-sectional area of connecting pipe and threaded-end connection. 2.3 JOINING MATERIALS A. Joint Compound and Tape: Suitable for natural gas. B. Welding Filler Metals: Comply with AWS D10.12/D10.12M for welding materials appropriate for wall thickness and chemical analysis of steel pipe being welded. C. Brazing Filler Metals: Alloy with melting point greater than 1000 deg F complying with AWS A5.8/A5.8M. Brazing alloys containing more than 0.05 percent phosphorus are prohibited. 2.4 MANUAL GAS SHUTOFF VALVES A. See "Underground Manual Gas Shutoff Valve Schedule" and "Aboveground Manual Gas Shutoff Valve Schedule" Articles for where each valve type is applied in various services. B. General Requirements for Metallic Valves, NPS 2 and Smaller: Comply with ASME B CWP Rating: 125 psig. 2. Threaded Ends: Comply with ASME B Dryseal Threads on Flare Ends: Comply with ASME B Tamperproof Feature: Locking feature for valves indicated in "Underground Manual Gas Shutoff Valve Schedule" and "Aboveground Manual Gas Shutoff Valve Schedule" Articles. 5. Listing: Listed and labeled by an NRTL acceptable to authorities having jurisdiction for valves 1 inch and smaller. 6. Service Mark: Valves 1-1/4 inches to NPS 2 shall have initials "WOG" permanently marked on valve body. C. Two-Piece, Fuli-Poti, Bronze Ball Valves with Bronze Trim: MSS SP Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: a. A.Y. McDonald Mfg. Co. b. BrassCraft Manufacturing Co.; a Masco company. PWA /4 FACILITY NATURAL-GAS PIPING

49 c. Conbraco Industries, Inc. 2. Body: Bronze, complying with ASTM B Ball: Chrome-plated bronze. 4. Stem: Bronze; blowout proof. 5. Seats: Reinforced TFE; blowout proof. 6. Packing: Threaded-body packnut design with adjustable-stem packing. 7. Ends: Threaded, flared, or socket as indicated in "Underground Manual Gas Shutoff Valve Schedule" and "Aboveground Manual Gas ShutoffValve Schedule" Atticles. 8. CWP Rating: 600 psig. 9. Listing: Valves NPS 1 and smaller shall be listed and labeled by an NRTL acceptable to authorities having jurisdiction. 10. Service: Suitable for natural-gas service with "WOG" indicated on valve body. D. Bronze Plug Valves: MSS SP Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: a. A.Y. McDonald Mfg. Co. b. Lee Brass Company. 2. Body: Bronze, complying with ASTM B Plug: Bronze. 4. Ends: Threaded, socket, as indicated in "Underground Manual Gas Shutoff Valve Schedule" and "Aboveground Manual Gas ShutoffValve Schedule" Articles. 5. Operator: Square head or lug type with tamperproof feature where indicated. 6. Pressure Class: 125 psig. 7. Listing: Valves NPS 1 and smaller shall be listed and labeled by an NR TL acceptable to authorities having jurisdiction. 8. Service: Suitable for natural-gas service with "WOG" indicated on valve body. 2.5 PRESSURE REGULATORS A. General Requirements: 1. Single stage and suitable for natural gas. 2. Steel jacket and corrosion-resistant components. 3. Elevation compensator. 4. End Connections: Threaded for regulators NPS 2 and smaller. B. Line Pressure Regulators: Comply with ANSI Z Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: a. Fisher Control Valves & Instruments; a brand of Emerson Process Management. b. Invensys. PWA /5 FACILITY NATURAL-GAS PIPING

50 c. Maxitrol Company. 2. Body and Diaphragm Case: Cast iron or die-cast aluminum. 3. Springs: Zinc-plated steel; interchangeable. 4. Diaphragm Plate: Zinc-plated steel. 5. Seat Disc: Nitrile rubber resistant to gas impurities, abrasion, and deformation at the valve port. 6. Orifice: Aluminum; interchangeable. 7. Seal Plug: Ultraviolet-stabilized, mineral-filled nylon. 8. Single-port, self-contained regulator with orifice no larger than required at maximum pressure inlet, and no pressure sensing piping external to the regulator. 9. Pressure regulator shall maintain discharge pressure setting downstream, and not exceed 150 percent of design discharge pressure at shutoff. 10. Overpressure Protection Device: Factory mounted on pressure regulator. 11. Atmospheric Vent: Factory- or field-installed, stainless-steel screen in opening if not connected to vent piping. 12. Maximum Inlet Pressure: 2 psig. C. Appliance Pressure Regulators: Comply with ANSI Z Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: a. Eaton Corporation. b. Harper Wyman Co. c. Maxitrol Company. 2. Body and Diaphragm Case: Die-cast aluminum. 3. Springs: Zinc-plated steel; interchangeable. 4. Diaphragm Plate: Zinc-plated steel. 5. Seat Disc: Nitrile rubber. 6. Seal Plug: Ultraviolet-stabilized, mineral-filled nylon. 7. Factory-Applied Finish: Minimum three-layer polyester and polyurethane paint finish. 8. Regulator may include vent limiting device, instead of vent connection, if approved by authorities having jurisdiction. 9. Maximum Inlet Pressure: 2 psig. 2.6 A. DIELECTRIC UNIONS Dielectric Unions: 1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: a. A.Y. McDonald Mfg. Co. b. Watts; a Watts Water Technologies company. c. Zurn Industries, LLC. PWA /6 FACILITY NATURAL-GAS PIPING

51 2. Description: a. Standard: ASSE b. Pressure Rating: 125 psig minimum at 180 deg F. c. End Connections: Solder-joint copper alloy and threaded ferrous. 2.7 LABELING AND IDENTIFYING A. Detectable Warning Tape: Acid- and alkali-resistant, PE film warning tape manufactured for marking and identifying underground utilities, a minimum of 6 inches wide and 4 mils thick, continuously inscribed with a description of utility, with metallic core encased in a protective jacket for corrosion protection, detectable by metal detector when tape is buried up to 30 inches deep; colored yellow. PART 3- EXECUTION 3.1 OUTDOOR PIPING INSTALLATION A. Comply with the International Fuel Gas Code for installation and purging of natural-gas piping. B. Install underground, natural-gas piping buried at least 36 inches below finished grade. Comply with requirements in Section "Earth Moving" for excavating, trenching, and backfilling. 1. If natural-gas piping is installed less than 36 inches below finished grade, install it in containment conduit. C. Install underground, PE, natural-gas piping according to ASTM D D. Steel Piping with Protective Coating: 1. Apply joint cover kits to pipe after joining to cover, seal, and protect joints. 2. Repair damage to PE coating on pipe as recommended in writing by protective coating manufacturer. E. Install fittings for changes in direction and branch connections. 3.2 INDOOR PIPING INSTALLATION A. B. c. Comply with the International Fuel Gas Code for installation and purging of natural-gas piping. Drawing plans, schematics, and diagrams indicate general location and arrangement of piping systems. Indicated locations and arrangements are used to size pipe and calculate friction loss, expansion, and other design considerations. Install piping as indicated unless deviations to layout are approved on Coordination Drawings. Arrange for pipe spaces, chases, slots, sleeves, and openings m building structure during progress of construction, to allow for mechanical installations. PWA /7 FACILITY NATURAL-GAS PIPING

52 D. Install piping in concealed locations unless otherwise indicated and except in equipment rooms and service areas. E. Install piping indicated to be exposed and piping in equipment rooms and service areas at right angles or parallel to building walls. Diagonal runs are prohibited unless specifically indicated otherwise. F. Install piping above accessible ceilings to allow sufficient space for ceiling panel removal. G. Locate valves for easy access. H. Install piping free of sags and bends. I. Install fittings for changes in direction and branch connections. J. Verity final equipment locations for roughing-in. K. Comply with requirements in Sections specifying gas-fired appliances and equipment for roughing-in requirements. L. Drips and Sediment Traps: Install drips at points where condensate may collect, including service-meter outlets. Locate where accessible to permit cleaning and emptying. Do not install where condensate is subject to freezing. 1. Construct drips and sediment traps using tee fitting with bottom outlet plugged or capped. Use nipple a minimum length of 3 pipe diameters, but not less than 3 inches long and same size as connected pipe. Install with space below bottom of drip to remove plug or cap. M. Extend relief vent connections for service regulators, line regulators, and overpressure protection devices to outdoors and terminate with weatherproof vent cap. N. Conceal pipe installations in walls, pipe spaces, utility spaces, above ceilings, below grade or floors, and in floor channels unless indicated to be exposed to view. 0. Use eccentric reducer fittings to make reductions in pipe sizes. Install fittings with level side down. P. Connect branch piping from top or side of horizontal piping. Q. Install unions in pipes NPS 2 and smaller, adjacent to each valve, at final connection to each piece of equipment. R. Do not use natural-gas piping as grounding electrode. S. Install strainer on inlet of each line-pressure regulator and automatic or electrically operated valve. T. Install sleeves for piping penetrations of walls, ceilings, and floors. Comply with requirements for sleeves specified in Section "Sleeves and Sleeve Seals for HV AC Piping." PWA /8 FACILITY NATURAL-GAS PIPING

53 U. Install sleeve seals for p1pmg penetrations of concrete walls and slabs. Comply with requirements for sleeve seals specified in Section "Sleeves and Sleeve Seals for HV AC Piping." V. Install escutcheons for p1pmg penetrations of walls, ceilings, and floors. Comply with requirements for escutcheons specified in Section "Escutcheons for HV AC Piping." 3.3 A. B. C. D. E. VALVE INSTALLATION Install manual gas shutoff valve for each gas appliance ahead of corrugated stainless-steel tubing or copper connector. Install underground valves with valve boxes. Install regulators and overpressure protection devices with maintenance access space adequate for servicing and testing. Install earthquake valves aboveground outside buildings according to listing. Install anode for metallic valves in underground PE piping. 3.4 A. B. c. PIPING JOINT CONSTRUCTION Ream ends of pipes and tubes and remove burrs. Remove scale, slag, dirt, and debris from inside and outside of pipe and fittings before assembly. Threaded Joints: 1. Thread pipe with tapered pipe threads complying with ASME B Cut threads full and clean using sharp dies. 3. Ream threaded pipe ends to remove burrs and restore full inside diameter of pipe. 4. Apply appropriate tape or thread compound to external pipe threads unless dryseal threading is specified. 5. Damaged Threads: Do not use pipe or pipe fittings with threads that are corroded or damaged. Do not use pipe sections that have cracked or open welds. D. Welded Joints: 1. Construct joints according to AWS D10.12/D10.12M, using qualified processes and welding operators. 2. Bevel plain ends of steel pipe. 3. Patch factory-applied protective coating as recommended by manufacturer at field welds and where damage to coating occurs during construction. E. PE Piping Heat-Fusion Joints: Clean and dry joining surfaces by wiping with clean cloth or paper towels. Join according to ASTM D Plain-End Pipe and Fittings: Use butt fusion. PWA /9 FACILITY NATURAL-GAS PIPING

54 2. Plain-End Pipe and Socket Fittings: Use socket fusion. 3.5 HANGER AND SUPPORT INSTALLATION A. Install seismic restraints on piping. Comply with requirements for seismic-restraint devices specified in Section "Vibration and Seismic Controls for HV AC." B. Comply with requirements for pipe hangers and supports specified in Section "Hangers and Supports for HV AC Piping and Equipment." C. Install hangers for horizontal steel piping with the following maximum spacing and minimum rod sizes: 1. NPS 1 and Smaller: Maximum span, 96 inches; minimum rod size, 3/8 inch. 2. NPS 1-1/4: Maximum span, 108 inches; minimum rod size, 3/8 inch. 3. NPS 1-1/2 and NPS 2: Maximum span, 108 inches; minimum rod size, 3/8 inch. 3.6 CONNECTIONS A. B. c. D. E. Connect to utility's gas main according to utility's procedures and requirements. Install natural-gas piping electrically continuous, and bonded to gas appliance equipment grounding conductor of the circuit powering the appliance according to NFPA 70. Install piping adjacent to appliances to allow service and maintenance of appliances. Connect piping to appliances using manual gas shutoff valves and unions. Install valve within 72 inches of each gas-fired appliance and equipment. Install union between valve and appliances or equipment. Sediment Traps: Install tee fitting with capped nipple m bottom to form drip, as close as practical to inlet of each appliance. 3.7 LABELING AND IDENTIFYING A. B. c. Install detectable warning tape directly above gas p1pmg, 12 inches below finished grade, except 6 inches below subgrade under pavements and slabs. Paint outdoor, aboveground gas piping and fittings parallel to and passing through building vertical surfaces of building to match surfaces. Paint outdoor, aboveground gas piping and fittings parallel to and passing through building horizontal surfaces yellow. 3.8 FIELD QUALITY CONTROL A. Test, inspect, and purge natural gas according to the International Fuel Gas Code and authorities having jurisdiction. PWA /10 FACILITY NATURAL-GAS PIPING

55 B. Natural-gas piping will be considered defective if it does not pass tests and inspections. C. Prepare test and inspection reports. 3.9 OUTDOOR PIPING SCHEDULE A. Underground natural-gas piping shall be the following: 1. PE pipe and fittings joined by heat fusion; service-line risers with tracer wire terminated in an accessible location. B. Aboveground natural-gas piping shall be one of the following: 1. Steel pipe with malleable-iron fittings and threaded joints. 2. Steel pipe with wrought-steel fittings and welded joints. C. Containment Conduit: Steel pipe with wrought-steel fittings and welded joints. Coat pipe and fittings with protective coating for steel piping INDOOR PIPING SCHEDULE A. Aboveground, branch piping NPS 1 and smaller shall be the following: 1. Steel pipe with malleable-iron fittings and threaded joints. B. Aboveground, distribution piping shall be one of the following: 1. Steel pipe with malleable-iron fittings and threaded joints. 2. Steel pipe with wrought-steel fittings and welded joints ABOVEGROUND MANUAL GAS SHUTOFF VALVE SCHEDULE A. Valves for pipe sizes NPS 2 and smaller at service meter shall be one of the following: 1. Two-piece, full-port, bronze ball valves with bronze trim. 2. Bronze plug valve. B. Distribution piping valves for pipe sizes NPS 2 and smaller shall be one of the following: 1. Two-piece, full-port, bronze ball valves with bronze trim. 2. Bronze plug valve. C. Valves in branch piping for single appliance shall be the following: 1. Two-piece, full-port, bronze ball valves with bronze trim. END OF SECTION PWA /11 FACILITY NATURAL:.GAS PIPING

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57 SECTION VRV REFRIGERANT PIPING PART 1 -GENERAL REQUIREMENTS 1.1 SUMMARY A. This Section includes refrigerant piping used specifically for variable refrigerant volume (VRV) air conditioning applications. This Section includes: 1. VRV piping installation certification and training 2. Pipes, tubing, fittings, and specialties. 3. Special duty valves. 4. Refrigerants. B. Related Sections: The following sections contain requirements that relate to this Section: 1. Division 2 Section "Earthwork," for trenching and backfilling materials and methods for underground piping installations. 2. Division 7 Section "Penetration Fire stopping," for materials and methods for fire barrier penetrations. 3. Division 7 Section "Joint Sealers," for materials and methods for sealing pipe penetrations through basement and foundation walls. 4. Division 23 Section "Identification for HV AC Piping & Equipment," for labeling and identification of refrigerant piping. 5. Division 23 Section "Common Work Results for HV AC" for materials and methods for wall and floor penetrations and equipment pads. 6. Division 23 Section "Basic Piping Material and Methods," for materials and methods for strainers, flexible connectors and mechanical sleeve seals. 7. Division 23 Section "Hangers & Supports for HV AC Piping & Equipment," for insulation shields, saddles and materials and methods for hanging and supporting refrigerant piping. 8. Division 23 Section "HV AC Insulation," for materials and methods for insulating refrigerant piping. 9. Division 23 Section "Variable Refrigeration Volume (VRV) Split AC Systems." 1.2 SUBMITTALS A. Product data for the following products: 1. Each type of refrigerant refnet fitting supplied 2. Each type of coupling fitting supplied B. Shop Drawings showing layout of refrigerant piping, specialties, and fittings including, but not necessarily limited to, pipe and tube sizes, valve arrangements and locations, slopes of horizontal runs, wall and floor penetrations, and equipment connection details. Show interface and spatial relationship between piping and proximate to equipment. C. VRV installer's current training certificates signed by manufacturer's designated training agent in compliance with requirements specified under "Quality Assurance" below. D. Refrigerant piping and joining system's certificates signed by manufacturer's designated training agent in compliance with requirements specified under "Quality Assurance" below. E. Test reports specified in Part 3 below. 1.3 QUALITY ASSURANCE A. The VRV piping installer shall be certified for installing the manufacturer's VRV equipment and piping system being installed. A minimum of one certified installer shall be present on site during construction to provide supervision and quality assurance inspection of all joints, fitting and pressure testing. The certified training shall have been completed within 6 months of the construction start date. B. Contractor may choose to utilize either brazed joints or mechanical couplings. If brazed joints are used, the engineer reserves the right to inspect any 3 joints of his choosing by cutting open pipe at the given joint and if not acceptable, reserves the right to have all PWA / 1 VARIABLE REFRIGERANT VOLUME REFRIGERANT PIPING

58 joints in that system cut removed and re-brazed under engineers supervision. Contractor will assume all costs including engineer's time to inspect re-installation. C. Regulatory Requirements: Comply with provisions of the following codes: 1. ANSI 831.5: ASME Code for Pressure Piping- Refrigerant Piping. 2. ANSI/ASHRAE Standard 15: Safety Code for Mechanical Refrigeration. 3. Mechanical Code 4. ASTM 8280: Seamless Copper Tube for Air Conditioning and Refrigeration Field service 5. ASTM 8210: Standard Specification for Aluminum and Aluminum-Alloy Drawn Seamless Tubes 6. UL 207: Refrigerant-Containing Components and Accessories, Nonelectrical D. Pipe, pipe fittings and pipe specialties shall be certified to meet the specified ASTM and ANSI standards. PART 2- PRODUCTS AND MATERIALS 2.1 MANUFACTURERS A. Manufacturers: Subject to compliance with requirements, provide products by one of the following: 1. Mechanically formed piping connection system: a. Reflok 2. Refrigerant pipe and tubing: a. Reflok Aluminum Tubing b. Copper tubing compliant with specification 2.2 PIPE AND TUBING MATERIALS A. General: Refer to Part 3, Article "PIPE APPLICATION" for identification of systems where the below specified pipe and fitting materials are used. B. Copper Tubing: ASTM B 280, Type ACR, hard-drawn straight lengths, and soft-annealed coils, seamless copper tubing. Tubing shall be factory cleaned, ready for installation, and have ends capped to protect cleanliness of pipe interiors prior to shipping. C. Aluminum Tubing and Fittings: ASTM 8210 seamless drawn aluminum tubing, cleaned and capped in accordance with ASTM 8280, and complying with ASME for allowable strength, and wall thickness. Tubing shall be 6061-T4 alloy, and clearly marked ASTM 8210 andacr. D. Insulation: Factory or field installed 3/4" flexible unicellular insulation on all refrigerant lines. All refrigerant lines shall be individually insulated. Provide quick-connect flare tubing compression fittings or solder connections per the VRV system installation instructions as required to match the connections of the condensing unit and evaporator coil. 2.3 FITTINGS Aluminum and Copper Fittings: ETL tested to UL 207 and letl listed. Fittings shall have dielectric coating to allow connection of dis-similar metals. Fittings shall be certified to a working pressure of 600 psi. Each mechanical fitting shall be provided in individual bags for specific locations in the refrigerant piping system and identified by tagging bag with specific location (i.e. refnet 1-1, BS box 1-l, FCU-1-1). 2.4 JOINING MATERIALS A. Interference Fit Retaining Compound: Urethane methacrylate, Loctite REFRIGERANT PIPING SPECIAL TIES A. General: The VRV equipment shall be furnished integral all piping specialties unless otherwise noted. Coordinate refrigerant piping installation requirements with VRV manufacturer's PWA /2 VARIABLE REFRIGERANT VOLUME REFRIGERANT PIPING

59 installation instructions. B. Refnet: Each Refnet shall be provided with exact piping size as indicated on the VRV piping schematic. Bushings, increasers and reducers will not be allowed. Refnet shall be provided in individual bags for specific locations in the refrigerant piping system and identified by tagging bag with specific location (i.e. refnet 1-1). 2.6 REFRIGERANT A. Refrigerant No. 41 OA, in accordance with ASHRAE Standard 34. PART 3 -EXECUTION 3.1 PIPE APPLICATIONS A. Use Type ACR aluminum or copper tubing with mechanically formed couplings. Brazed joints are not permitted due to the proximity of combustible materials 1. Hard copper or aluminum shall be installed for all piping %" and larger, and for lengths over 25'. 2. Soft annealed copper may be used for sizes 5/8" and smaller for lengths 25' and under. 3. All tubing must be clearly marked "Type ACR" and be kept clean and capped. Protect inside of tubing as specified in Article "CLEANING" below. 3.2 PIPING INSTALLATIONS A. General: Install refrigerant piping in accordance with ASHRAE Standard 15 - "The Safety Code for Mechanical Refrigeration" and the equipment manufacturer's installation requirements. B. Install piping in as short and direct arrangement as possible to minimize pressure drop. C. Install piping for minimum number of joints using as few elbows and other fittings as possible. D. Arrange piping to allow normal inspection and servicing of compressor and other equipment. Install valves and specialties in accessible locations to allow for servicing and inspection. E. Provide adequate clearance between pipe and adjacent walls and hanger, or between pipes for insulation installation. Use sleeves through floors, walls, or ceilings, sized to permit installation of full thickness insulation. F. Insulate all refrigeration lines. G. Install branch tie-in lines to parallel compressors equal length, and pipe identically and symmetrically. H. Install copper tubing in rigid or flexible conduit in locations where copper tubing will be exposed to mechanical injury. I. Slope refrigerant piping as recommended by the manufacturer's installation instructions. J. Refrigerant piping shall be free of traps, refer to manufacturer's installation instructions. K. Maintain minimum distances between fittings as recommended per manufacturer's installation instructions. L. Install piping free of sags or bends and with ample space between piping to permit proper insulation applications. M. Conceal all pipe installations in walls, pipe chases, utility spaces, above ceilings, unless indicated to be exposed to view. N. Install horizontal piping as high as possible allowing for the required slope and in coordination with other components. Install vertical piping tight to columns or walls. Provide space to permit insulation applications, with 1 inch clearance outside the insulation. Allow sufficient space above removable ceiling panels to allow for panel removal. 0. Locate groups of pipes parallel to each other, spaced to permit applying insulation and servicing of valves. P. Exterior Wall Penetrations: Seal pipe penetrations through exterior walls using sleeves and PWA /3 VARIABLE REFRIGERANT VOLUME REFRIGERANT PIPING

60 mechanical sleeve seals. Pipe sleeves smaller than 6 inch shall be steel; pipe sleeves 6 inch and larger shall be sheet metal. Refer to Division 23 Section "Basic Piping Materials and Methods" for additional information. Q. Fire Barrier Penetrations: Where pipes pass through fire rated walls, patiitions, ceilings, and floors, maintain the fire rated integrity. Refer to Division 7 Section "Penetration Fire stopping" for special sealers and materials. R. Underground Exterior Wall Penetrations: Seal pipe penetrations through underground exterior walls with sleeves and mechanical sleeve seals. Refer to Division 23 Section "Basic Piping Materials and Methods" for additional information. S. Elevated Floor Penetrations of Waterproof Membrane, Interior Penetrations of No-Fire Rated Walls and Concrete Slab on Grade Penetrations: Provide sleeves and seal pipes that pass through waterproof floors, non-fire rated walls, partitions and ceilings or concrete slab on grade. Refer to Division 23 Section "Common Work Results for HV AC" for special sealers and materials. T. Make reductions in pipe sizes using concentric reducer fittings installed with the level side down. 3.3 HANGERS AND SUPPORTS A. General: Hanger, supports, and anchors are specified in Division 23 Section "Hangers and Supports for HV AC Piping and Equipment." Conform to the table below for maximum spacing of supports: 1. Pipe attachments shall be copper-plated or have nonmetallic coating for electrolytic protection where attachments are in direct contact with copper tubing. Provide plastic galvanic isolators for copper tubing where indicated. B. Install the following pipe attachments: 1. Adjustable band hangers for individual horizontal runs less than 20 feet in length. 2. Roller hangers and spring hangers for individual horizontal runs 20 feet or longer. 3. Pipe rollers complete supports for multiple horizontal runs, 20 feet or longer supported by a trapeze. 4. Spring hangers to support vertical runs. C. Install hangers with the following minimum rod sizes and maximum spacing: NOM. PIPE SIZE MAX. SPAN-FT MIN. ROD SIZE - INCHES Up to 3/4 5 3/ ~ /8 1-1/2 8 3/ ~ / /8 D. Support vertical runs at each floor. E. Install a support within one foot of each change of direction. 3.4 PIPE JOINT CONSTRUCTION A. Mechanical Joints: Comply with manufacturers training. 3.5 VALVE AND PIPING SPECIALTIES INSTALLATIONS A. General: Install refrigerant valves where indicated, and in accordance with manufacturer's instructions. PWA /4 VARIABLE REFRIGERANT VOLUME REFRIGERANT PIPING

61 3.6 EQUIPMENT CONNECTIONS A. The Drawings indicate the general arrangement of piping, fittings, and specialties. B. Install piping adjacent to machine to allow servicing and maintenance. 3.7 FIELD QUALITY CONTROL A. Inspect, test, and perform corrective action of refrigerant piping in accordance with ASME Codt< B31.5, Chapter VI. Provide test report summarizing the test procedures and results of the tests. B. Repair leaking joints using new materials, and retest for leaks. C. Field Test: Every refrigerant-containing part of every system that is erected on the premises, except safety devices, pressure gauges, control mechanisms, compressors, evaporators, and systems that are factory-tested, shall be tested and proved tight after complete installation and before operation. The high side and low side of each system shall be tested and proved tight at not less than the lower of the design pressure or the setting of the pressure-relief device protecting the high side and low side of the system, respectively. D. Testing Procedure: Tests shall be performed with dry nitrogen. The means used to build up the test pressure shall have either a pressure-limiting device or a pressure-reducing device and a gage on the outlet side. The pressure-relief device shall be set above the test pressure but low enough to prevent permanent deformation of the system's components. 3.8 CLEANING A. All tubing shall be type ACR and shall remain capped until installation. 3.9 STARTUP A. Provide VRV factory trained technician for charging and system startup. B. Charge system using the following procedure: 1. Triple evacuate refrigerant system with vacuum pump down to 500 microns. 2. Maintain vacuum on system for minimum of 5 hours after closing valve between vacuum pump and system. 3. Break vacuum with refrigerant gas per manufacturer's recommendations. C. Train Owner's maintenance personnel on procedures and schedules related to stat1-up and shutdown, troubleshooting, servicing, and preventative maintenance of refrigerant piping valves and refrigerant piping specialties. D. Review data in Operating and Maintenance Manuals. Refer to Division 1 section "Closeout Procedures." E. Schedule training with Owner through the Architect, with at least 7 days advance notice. END OF SECTION PWA /5 VARIABLE REFRIGERANT VOLUME REFRIGERANT PIPING

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63 SECTION METAL DUCTS PART 1- GENERAL 1.1 SUMMARY A. Section Includes: 1. Rectangular ducts and fittings. 2. Round ducts and fittings. 3. Sheet metal materials. 4. Sealants and gaskets. 5. Hangers and supports. B. Related Sections: 1. Section "Testing, Adjusting, and Balancing for HV AC" for testing, adjusting, and balancing requirements for metal ducts. 2. Section "Nonmetal Ducts" for fibrous-glass ducts, thermoset fiber-reinforced plastic ducts, thermoplastic ducts, PVC ducts, and concrete ducts. 3. Section "Air Duct Accessories" for dampers, sound-control devices, ductmounting access doors and panels, turning vanes, and flexible ducts. 1.2 ACTION SUBMITTALS A. Product Data: For each type of product indicated. 1.3 INFORMATIONAL SUBMITTALS A. Welding certificates. 1.4 QUALITY ASSURANCE A. Welding Qualifications: Quality procedures and personnel according to the following: 1. A WS D 1.1/D 1.1 M, "Structural Welding Code - Steel," for hangers and supports. 2. AWS Dl.2/Dl.2M, "Structural Welding Code- Aluminum," for aluminum supports. 3. AWS D9.1MID9.1, "Sheet Metal Welding Code," for duct joint and seam welding. PART 2- PRODUCTS 2.1 RECTANGULAR DUCTS AND FITTINGS A. General Fabrication Requirements: Comply with SMACNA's "HV AC Duct Construction Standards - Metal and Flexible" based on indicated static-pressure class unless otherwise indicated. PWA I 1 METAL DUCTS

64 B. c. D. Transverse Joints: Select joint types and fabricate according to SMACNA's "HV AC Duct Construction Standards - Metal and Flexible," Figure 2-1, "Rectangular Duct/Transverse Joints," for static-pressure class, applicable sealing requirements, materials involved, ductsupport intervals, and other provisions in SMACNA's "HV AC Duct Construction Standards - Metal and Flexible." Longitudinal Seams: Select seam types and fabricate according to SMACNA's "HV AC Duct Construction Standards - Metal and Flexible," Figure 2-2, "Rectangular Duct/Longitudinal Seams," for static-pressure class, applicable sealing requirements, materials involved, ductsupport intervals, and other provisions in SMACNA's "HV AC Duct Construction Standards - Metal and Flexible." Elbows, Transitions, Offsets, Branch Connections, and Other Duct Construction: Select types and fabricate according to SMACNA's "HV AC Duct Construction Standards - Metal and Flexible," Chapter 4, "Fittings and Other Construction," for static-pressure class, applicable sealing requirements, materials involved, duct-support intervals, and other provisions in SMACNA's "HV AC Duct Construction Standards- Metal and Flexible." 2.2 A. B. c. D. ROUND DUCTS AND FITTINGS General Fabrication Requirements: Comply with SMACNA's "HV AC Duct Construction Standards - Metal and Flexible," Chapter 3, "Round, Oval, and Flexible Duct," based on indicated static-pressure class unless otherwise indicated. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: 1. Lindab Inc. 2. McGill AirFlow LLC. 3. SEMCO Incorporated. Transverse Joints: Select joint types and fabricate according to SMACNA's "HV AC Duct Construction Standards- Metal and Flexible," Figure 3-1, "Round Duct Transverse Joints," for static-pressure class, applicable sealing requirements, materials involved, duct-support intervals, and other provisions in SMACNA's "HV AC Duct Construction Standards - Metal and Flexible." 1. Transverse Joints in Ducts Larger Than 60 Inches in Diameter: Flanged. Longitudinal Seams: Select seam types and fabricate according to SMACNA's "HV AC Duct Construction Standards - Metal and Flexible," Figure 3-2, "Round Duct Longitudinal Seams," for static-pressure class, applicable sealing requirements, materials involved, duct-support intervals, and other provisions in SMACNA's "HV AC Duct Construction Standards - Metal and Flexible." 1. Fabricate round ducts larger Than 90 inches in diameter with butt-welded longitudinal seams. E. Tees and Laterals: Select types and fabricate according to SMACNA's "HVAC Duct Construction Standards - Metal and Flexible," Figure 3-5, "90 Degree Tees and Laterals," and Figure 3-6, "Conical Tees," for static-pressure class, applicable sealing requirements, materials involved, duct-support intervals, and other provisions in SMACNA's "HV AC Duct Construction Standards- Metal and Flexible." PWA /2 METAL DUCTS

65 2.3 SHEET METAL MATERIALS A. General Material Requirements: Comply with SMACNA's "HV AC Duct Construction Standards - Metal and Flexible" for acceptable materials, material thicknesses, and duct construction methods unless otherwise indicated. Sheet metal materials shall be free of pitting, seam marks, roller marks, stains, discolorations, and other imperfections. B. Galvanized Sheet Steel: Comply with ASTM A 653/A 653M. 1. Galvanized Coating Designation: G Finishes for Surfaces Exposed to View: Mill phosphatized. C. Carbon-Steel Sheets: Comply with ASTM A 1008/A 1008M, with oiled, matte finish for exposed ducts. D. Stainless-Steel Sheets: Comply with ASTM A 480/A 480M, Type 304 or 316, as indicated in the "Duct Schedule" Article; cold rolled, annealed, sheet. Exposed surface finish shall be No. 2B, No. 2D, No. 3, or No. 4 as indicated in the "Duct Schedule" Article. E. Aluminum Sheets: Comply with ASTM B 209 Alloy 3003, H14 temper; with mill finish for concealed ducts, and standard, one-side bright finish for duct surfaces exposed to view. F. Reinforcement Shapes and Plates: ASTM A 36/A 36M, steel plates, shapes, and bars; black and galvanized. 1. Where black- and galvanized-steel shapes and plates are used to reinforce aluminum ducts, isolate the different metals with butyl rubber, neoprene, or EPDM gasket materials. G. Tie Rods: Galvanized steel, 1/4-inch minimum diameter for lengths 36 inches or less; 3/8-inch minimum diameter for lengths longer than 36 inches. 2.4 SEALANT AND GASKETS A. General Sealant and Gasket Requirements: Surface-burning characteristics for sealants and gaskets shall be a maximum flame-spread index of 25 and a maximum smoke-developed index of 50 when tested according to UL 723; cet1ified by an NRTL. B. Water-Based Joint and Seam Sealant: 1. Application Method: Brush on. 2. Solids Content: Minimum 65 percent. 3. Shore A Hardness: Minimum Water resistant. 5. Mold and mildew resistant. 6. VOC: Maximum 75 g/l (less water). 7. Maximum Static-Pressure Class: 10-inch wg, positive and negative. 8. Service: Indoor or outdoor. 9. Substrate: Compatible with galvanized sheet steel (both PVC coated and bare), stainless steel, or aluminum sheets. C. Flanged Joint Sealant: Comply with ASTM C 920. I. General: Single-component, acid-curing, silicone, elastomeric. 2. Type: S. PWA I 3 METAL DUCTS

66 3. Grade: NS. 4. Class: Use: 0. D. Flange Gaskets: Butyl rubber, neoprene, or EPDM polymer with polyisobutylene plasticizer. E. Round Duct Joint 0-Ring Seals: 1. Seal shall provide maximum 3 cfm/100 sq. ft. at l-inch wg and shall be rated forlo-inch wg static-pressure class, positive or negative. 2. EPDM 0-ring to seal in concave bead in coupling or fitting spigot. 3. Double-lipped, EPDM 0-ring seal, mechanically fastened to factory-fabricated couplings and fitting spigots. 2.5 HANGERS AND SUPPORTS A. Hanger Rods for Noncorrosive Environments: Cadmium-plated steel rods and nuts. B. Hanger Rods for Corrosive Environments: Electrogalvanized, all-thread rods or galvanized rods with threads painted with zinc-chromate primer after installation. C. Strap and Rod Sizes: Comply with SMACNA's "HV AC Duct Construction Standards - Metal and Flexible," Table 5-1, "Rectangular Duct Hangers Minimum Size," and Table 5-2, "Minimum Hanger Sizes for Round Duct." D. Steel Cables for Galvanized-Steel Ducts: Galvanized steel complying with ASTM A 603. E. Steel Cables for Stainless-Steel Ducts: Stainless steel complying with ASTM A 492. F. Steel Cable End Connections: Cadmium-plated steel assemblies with brackets, swivel, and bolts designed for duct hanger service; with an automatic-locking and clamping device. G. Duct Attachments: Sheet metal screws, blind rivets, or self-tapping metal screws; compatible with duct materials. H. Trapeze and Riser Supports: 1. Supports for Galvanized-Steel Ducts: Galvanized-steel shapes and plates. 2. Supports for Stainless-Steel Ducts: Stainless-steel shapes and plates. 3. Supports for Aluminum Ducts: Aluminum or galvanized steel coated with zinc chromate. PART 3- EXECUTION 3.1 DUCT INSTALLATION A. Drawing plans, schematics, and diagrams indicate general location and arrangement of duct system. Indicated duct locations, configurations, and arrangements were used to size ducts and calculate friction loss for air-handling equipment sizing and for other design considerations. Install duct systems as indicated unless deviations to layout are approved on Shop Drawings and Coordination Drawings. PWA I 4 METAL DUCTS

67 B. Install ducts according to SMACNA's "HV AC Duct Construction Standards - Metal and Flexible" unless otherwise indicated. C. Install round ducts in maximum practical lengths. D. Install ducts with fewest possible joints. E. Install factory- or shop-fabricated fittings for changes in direction, size, and shape and for branch connections. F. Unless otherwise indicated, install ducts vertically and horizontally, and parallel and perpendicular to building lines. G. Install ducts close to walls, overhead construction, columns, and other structural and permanent enclosure elements of building. H. Install ducts with a clearance of 1 inch, plus allowance for insulation thickness. I. Route ducts to avoid passing through transformer vaults and electrical equipment rooms and enclosures. J. Where ducts pass through non-fire-rated interior partitions and exterior walls and are exposed to view, cover the opening between the partition and duct or duct insulation with sheet metal flanges of same metal thickness as the duct. Overlap openings on four sides by at least 1-1/2 inches. K. Where ducts pass through fire-rated interior partitions and exterior walls, install fire dampers. Comply with requirements in Section "Air Duct Accessories" for fire and smoke dampers. L. Protect duct interiors from moisture, construction debris and dust, and other foreign materials. Comply with SMACNA's "IAQ Guidelines for Occupied Buildings Under Construction," Appendix G, "Duct Cleanliness for New Construction Guidelines." 3.2 INSTALLATION OF EXPOSED DUCTWORK A. Protect ducts exposed in finished spaces from being dented, scratched, or damaged. B. Trim duct sealants flush with metal. Create a smooth and uniform exposed bead. Do not use two-pmi tape sealing system. C. Grind welds to provide smooth surface free of burrs, sharp edges, and weld splatter. When welding stainless steel with a No. 3 or 4 finish, grind the welds flush, polish the exposed welds, and treat the welds to remove discoloration caused by welding. D. Maintain consistency, symmetry, and uniformity in the arrangement and fabrication of fittings, hangers and suppotis, duct accessories, and air outlets. E. Repair or replace damaged sections and finished work that does not comply with these requirements. PWA I 5 METAL DUCTS

68 3.3 ADDITIONAL INSTALLATION REQUIREMENTS FOR COMMERCIAL KITCHEN HOOD EXHAUST DUCT A. Install commercial kitchen hood exhaust ducts without dips and traps that may hold grease, and sloped a minimum of 2 percent to drain grease back to the hood. B. Install fire-rated access panel assemblies at each change in direction and at maximum intervals of 20 feet in horizontal ducts, and at every floor for vertical ducts, or as indicated on Drawings. Locate access panel on top or sides of duct a minimum of 1-1/2 inches from bottom of duct. C. Do not penetrate fire-rated assemblies except as allowed by applicable building codes and authorities havingjurisdiction. 3.4 DUCT SEALING A. Seal ducts to the following seal classes according to SMACNA's "HV AC Duct Construction Standards- Metal and Flexible": 1. Comply with SMACNA's "HV AC Duct Construction Standards- Metal and Flexible." 2. Outdoor, Supply-Air Ducts: Seal Class A. 3. Outdoor, Exhaust Ducts: Seal Class C. 4. Outdoor, Return-Air Ducts: Seal Class C. 5. Unconditioned Space, Supply-Air Ducts in Pressure Classes 2-Inch wg and Lower: Seal Class B. 6. Unconditioned Space, Supply-Air Ducts in Pressure Classes Higher Than 2-Inch wg: Seal Class A. 7. Unconditioned Space, Exhaust Ducts: Seal Class C. 8. Unconditioned Space, Return-Air Ducts: Seal Class B. 9. Conditioned Space, Supply-Air Ducts in Pressure Classes 2-Inch wg and Lower: Seal Class C. 10. Conditioned Space, Supply-Air Ducts in Pressure Classes Higher Than 2-Inch wg: Seal Class B. 11. Conditioned Space, Exhaust Ducts: Seal Class B. 12. Conditioned Space, Return-Air Ducts: Seal Class C. 3.5 HANGER AND SUPPORT INSTALLATION A. Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible," Chapter 5, "Hangers and Supports." B. Building Attachments: Concrete inserts, powder-actuated fasteners, or structural-steel fasteners appropriate for construction materials to which hangers are being attached. 1. Where practical, install concrete inserts before placing concrete. 2. Install powder-actuated concrete fasteners after concrete is placed and completely cured. 3. Use powder-actuated concrete fasteners for standard-weight aggregate concretes or for slabs more than 4 inches thick. 4. Do not use powder-actuated concrete fasteners for lightweight-aggregate concretes or for slabs less than 4 inches thick. PWA I 6 METAL DUCTS

69 C. Hanger Spacing: Comply with SMACNA's "HV AC Duct Construction Standards - Metal and Flexible," Table 5-l, "Rectangular Duct Hangers Minimum Size," and Table 5-2, "Minimum Hanger Sizes for Round Duct," for maximum hanger spacing; install hangers and supports within 24 inches of each elbow and within 48 inches of each branch intersection. D. Hangers Exposed to View: Threaded rod and angle or channel supports. E. Support vertical ducts with steel angles or channel secured to the sides of the duct with welds, bolts, sheet metal screws, or blind rivets; support at each floor and at a maximum intervals of 16 feet. F. Install upper attachments to structures. Select and size upper attachments with pull-out, tension, and shear capacities appropriate for supported loads and building materials where used. 3.6 CONNECTIONS A. Make connections to equipment with flexible connectors complying with Section "Air Duct Accessories." B. Comply with SMACNA's "HV AC Duct Construction Standards - Metal and Flexible" for branch, outlet and inlet, and terminal unit connections. 3.7 DUCT CLEANING A. Clean new duct system(s) before testing, adjusting, and balancing. B. Clean the following components by removing surface contaminants and deposits: 1. Air outlets and inlets (registers, grilles, and diffusers). 2. Supply, return, and exhaust fans including fan housings, plenums (except ceiling supply and return plenums), scrolls, blades or vanes, shafts, baffles, dampers, and drive assemblies. 3. Air-handling unit internal surfaces and components including mixing box, coil section, air wash systems, spray eliminators, condensate drain pans, humidifiers and dehumidifiers, filters and filter sections, and condensate collectors and drains. 4. Coils and related components. 5. Return-air ducts, dampers, actuators, and turning vanes except in ceiling plenums and mechanical equipment rooms. 6. Supply-air ducts, dampers, actuators, and turning vanes. 7. Dedicated exhaust and ventilation components and makeup air systems. 3.8 STARTUP A. Air Balance: Comply with requirements in Section "Testing, Adjusting, and Balancing forhvac." 3.9 DUCT SCHEDULE A. Fabricate ducts with galvanized sheet steel except as otherwise indicated and as follows: ColumbiaPublicSchools PWA /7 METAL DUCTS

70 1. Underground Ducts: Concrete-encased, galvanized sheet steel. B. Supply Ducts: 1. Ducts Connected to Fan Coil Units, Furnaces, Heat Pumps, and Terminal Units: a. Pressure Class: Positive l-inch wg. b. SMACNA Leakage Class for Rectangular: 24. c. SMACNA Leakage Class for Round and Flat Oval: Ducts Connected to Constant-Volume Air-Handling Units: a. Pressure Class: Positive 2-inch wg. b. SMACNA Leakage Class for Rectangular: 12. c. SMACNA Leakage Class for Round and Flat Oval: Ducts Connected to Variable-Air-Volume Air-Handling Units: a. Pressure Class: Positive 3-inch wg. b. SMACNA Leakage Class for Rectangular: 12. c. SMACNA Leakage Class for Round and Flat Oval: Ducts Connected to Equipment Not Listed Above: a. Pressure Class: Positive 2-inch wg. b. SMACNA Leakage Class for Rectangular: 12. c. SMACNA Leakage Class for Round and Flat Oval: 6. C. Return Ducts: 1. Ducts Connected to Fan Coil Units, Furnaces, Heat Pumps, and Terminal Units: a. Pressure Class: Positive or negative l-inch wg. b. SMACNA Leakage Class for Rectangular: 24. c. SMACNA Leakage Class for Round and Flat Oval: Ducts Connected to Air-Handling Units: a. Pressure Class: Positive or negative 2-inch wg. b. SMACNA Leakage Class for Rectangular: 12. c. SMACNA Leakage Class for Round and Flat Oval: Ducts Connected to Equipment Not Listed Above: a. Pressure Class: Positive or negative 2-inch wg. b. SMACNA Leakage Class for Rectangular: 12. c. SMACNA Leakage Class for Round and Flat Oval: 6. D. Exhaust Ducts: 1. Ducts Connected to Fans Exhausting (ASHRAE 62.1, Class 1 and 2) Air: a. Pressure Class: Negative l-inch wg. b. SMACNA Leakage Class for Rectangular: 24. c. SMACNA Leakage Class for Round and Flat Oval: Ducts Connected to Air-Handling Units: a. Pressure Class: Positive or negative 2-inch wg. b. SMACNA Leakage Class for Rectangular: 12. c. SMACNA Leakage Class for Round and Flat Oval: Ducts Connected to Commercial Kitchen Hoods: Comply with NFPA 96. a. Exposed to View: Type 304, stainless-steel sheet, No. 4 finish. b. Concealed: Carbon-steel sheet. c. Welded seams and joints. d. Pressure Class: Positive or negative 2-inch wg. e. Minimum SMACNA Seal Class: Welded seams, joints, and penetrations. f. SMACNA Leakage Class: Ducts Connected to Dishwasher Hoods: PWA /8 METAL DUCTS

71 a. Type 304, stainless-steel sheet. b. Exposed to View: No. 4 finish. c. Concealed: No. 2D finish. d. Welded seams and flanged joints with watertight EPDM gaskets. e. Pressure Class: Positive or negative 2-inch wg. f. Minimum SMACNA Seal Class: Welded seams, joints, and penetrations. g. SMACNA Leakage Class: Ducts Connected to Fans Exhausting Laboratory and Process (ASHRAE 62.1, Class 3 and 4) Air: a. Type 316, stainless-steel sheet. 1) Exposed to View: No.4 finish. 2) Concealed: No. 2B finish. b. Pressure Class: Positive or negative 3-inch wg. c. Minimum SMACNA Seal Class: A. d. SMACNA Leakage Class: Ducts Connected to Equipment Not Listed Above: a. Pressure Class: Positive or negative 2-inch wg. b. Minimum SMACNA Seal Class: B if negative pressure, and A if positive pressure. c. SMACNA Leakage Class for Rectangular: 12. d. SMACNA Leakage Class for Round and Flat Oval: 6. E. Outdoor-Air (Not Filtered, Heated, or Cooled) Ducts: 1. Ducts Connected to Fan Coil Units, Furnaces, Heat Pumps, and Terminal Units: a. Pressure Class: Positive or negative l-inch wg. b. Minimum SMACNA Seal Class: B. c. SMACNA Leakage Class for Rectangular: 24. d. SMACNA Leakage Class for Round and Flat Oval: Ducts Connected to Air-Handling Units: a. Pressure Class: Positive or negative 2-inch wg. b. Minimum SMACNA Seal Class: B. c. SMACNA Leakage Class for Rectangular: 12. d. SMACNA Leakage Class for Round and Flat Oval: Ducts Connected to Equipment Not Listed Above: a. Pressure Class: Positive or negative 2-inch wg. b. Minimum SMACNA Seal Class: B. c. SMACNA Leakage Class for Rectangular: 12. d. SMACNA Leakage Class for Round and Flat Oval: 6. F. Intermediate Reinforcement: 1. Galvanized-Steel Ducts: Galvanized steel. 2. Stainless-Steel Ducts: a. Exposed to Airstream: Match duct material. b. Not Exposed to Airstream: Match duct material. 3. Aluminum Ducts: Aluminum. G. Elbow Configuration: 1. Rectangular Duct: Comply with SMACNA's "HV AC Duct Construction Standards - Metal and Flexible," Figure 4-2, "Rectangular Elbows." a. Velocity 1000 fpm or Lower: 1) Radius Type RE 1 with minimum 0.5 radius-to-diameter ratio. PWA /9 METAL DUCTS

72 2) Mitered Type RE 4 without vanes. b. Velocity 1000 to I500 fpm: 1) Radius Type RE I with minimum 1.0 radius-to-diameter ratio. 2) Radius Type RE 3 with minimum 0.5 radius-to-diameter ratio and two vanes. 3) Mitered Type RE 2 with vanes complying with SMACNA's "HV AC Duct Construction Standards- Metal and Flexible," Figure 4-3, "Vanes and Vane Runners," and Figure 4-4, "Vane Support in Elbows." c. Velocity 1500 fpm or Higher: I) Radius Type RE 1 with minimum I.5 radius-to-diameter ratio. 2) Radius Type RE 3 with minimum 1.0 radius-to-diameter ratio and two vanes. 3) Mitered Type RE 2 with vanes complying with SMACNA's "HV AC Duct Construction Standards- Metal and Flexible," Figure 4-3, "Vanes and Vane Runners," and Figure 4-4, "Vane Support in Elbows." 2. Round Duct: Comply with SMACNA's "HV AC Duct Construction Standards - Metal and Flexible," Figure 3-4, "Round Duct Elbows." a. Minimum Radius-to-Diameter Ratio and Elbow Segments: Comply with SMACNA's "HVAC Duct Construction Standards -Metal and Flexible," Table 3-1, "Mitered Elbows." Elbows with less than 90-degree change of direction have proportionately fewer segments. 1) Velocity 1000 fpm or Lower: 0.5 radius-to-diameter ratio and three segments for 90-degree elbow. 2) Velocity 1000 to 1500 fpm: 1.0 radius-to-diameter ratio and four segments for 90-degree elbow. 3) Velocity 1500 fpm or Higher: I.5 radius-to-diameter ratio and five segments for 90-degree elbow. b. Round Elbows, 12 Inches and Smaller in Diameter: Stamped or pleated. c. Round Elbows, 14 Inches and Larger in Diameter: Standing seam. H. Branch Configuration: 1. Rectangular Duct: Comply with SMACNA's "HV AC Duct Construction Standards - Metal and Flexible," Figure 4-6, "Branch Connection." a. Rectangular Main to Rectangular Branch: 45-degree entry. b. Rectangular Main to Round Branch: 45-degree entry. 2. Round: Comply with SMACNA's "HV AC Duct Construction Standards - Metal and Flexible," Figure 3-5, "90 Degree Tees and Laterals," and Figure 3-6, "Conical Tees." Saddle taps are permitted in existing duct. a. Velocity 1000 fpm or Lower: 90-degree tap. b. Velocity 1000 to 1500 fpm: Conical tap. c. Velocity 1500 fpm or Higher: 45-degree lateral. END OF SECTION PWA /10 METAL DUCTS

73 SECTION AIR DUCT ACCESSORIES PART 1- GENERAL 1.1 SUMMARY A. Section Includes: 1. Backdraft and pressure relief dampers. 2. Manual volume dampers. 3. Turning vanes. 4. Flexible connectors. 5. Flexible ducts. 6. Duct accessory hardware. 7. Louvers 1.2 SUBMITTALS A. Product Data: For each type of product indicated. B. Operation and maintenance data. 1.3 QUALITY ASSURANCE A. Comply with NFP A 90A, "Installation of Air Conditioning and Ventilating Systems," and with NFPA 90B, "Installation of Warm Air Heating and Air Conditioning Systems." B. Comply with AMCA 500-D testing for damper rating. PART 2- PRODUCTS 2.1 MATERIALS A. Comply with SMACNA's "HV AC Duct Construction Standards - Metal and Flexible" for acceptable materials, material thicknesses, and duct construction methods unless otherwise indicated. Sheet metal materials shall be free of pitting, seam marks, roller marks, stains, discolorations, and other imperfections. B. Galvanized Sheet Steel: Comply with ASTM A 653/A 653M. 1. Galvanized Coating Designation: [G60] [G90]. 2. Exposed-Surface Finish: Mill phosphatized. C. Reinforcement Shapes and Plates: Galvanized-steel reinforcement where installed on galvanized sheet metal ducts; compatible materials for aluminum and stainless-steel ducts. D. Tie Rods: Galvanized steel, 1/4-inch minimum diameter for lengths 36 inches or less; 3/8-inch minimum diameter for lengths longer than 36 inches. 2.2 BACKDRAFT AND PRESSURE RELIEF DAMPERS A. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following: 1. Ruskin Company. B. Description: Gravity balanced. PWA /1 AIR DUCT ACCESSORIES

74 c. D. E. F. G. H. I. J. K. L. M. Maximum Air Velocity: 2000 fpm Maximum System Pressure: l-inch wg Frame: inch- thick, galvanized sheet steel, with welded corners and mounting flange. Blades: Multiple single-piece blades, center-pivoted, maximum 6-inch width, inchthick, roll-formed aluminum with sealed edges. Blade Action: Parallel. Blade Seals: Felt. Blade Axles: 1. Material: Nonferrous metal. 2. Diameter: 0.20 inch. Tie Bars and Brackets: Aluminum. Return Spring: Adjustable tension. Bearings: Steel ball or synthetic pivot bushings. Accessories: 1. Adjustment device to permit setting for varying differential static pressure. 2. Counterweights and spring-assist kits for vertical airflow installations. 3. Screen Mounting: Front mounted in sleeve. a. Sleeve Thickness: 20-gage minimum. b. Sleeve Length: 6 inches minimum. 4. Screen Mounting: Rear mounted. 5. Screen Material: Aluminum. 6. Screen Type: Insect degree stops. 2.3 A. B. MANUAL VOLUME DAMPERS Standard, Steel, Manual Volume Dampers: 1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following: a. Ruskin Company. 2. Standard leakage rating, with linkage outside airstream. 3. Suitable for horizontal or vertical applications. 4. Frames: a. Hat-shaped, galvanized-steel channels, inch minimum thickness. b. Mitered and welded corners. c. Flanges for attaching to walls and flangeless frames for installing in ducts. 5. Blades: a. Multiple or single blade. b. Parallel- or opposed-blade design. c. Stiffen damper blades for stability. d. Galvanized-steel, inch thick. 6. Blade Axles: Nonferrous metal. 7. Bearings: a. Molded synthetic. b. Dampers in ducts with pressure classes of 3-inch wg or less shall have axles full length of damper blades and bearings at both ends of operating shaft. 8. Tie Bars and Brackets: Galvanized steel. Jackshaft: 1. Size: l-inch diameter. PWA /2 AIR DUCT ACCESSORIES

75 c. 2. Material: Galvanized-steel pipe rotating within pipe-bearing assembly mounted on supports at each mullion and at each end of multiple-damper assemblies. 3. Length and Number of Mountings: As required to connect linkage of each damper in multiple-damper assembly. Damper Hardware: 1. Zinc-plated, die-cast core with dial and handle made of 3/32-inch- thick zinc-plated steel, and a 3/4-inch hexagon locking nut. 2. Include center hole to suit damper operating-rod size. 3. Include elevated platform for insulated duct mounting. 2.4 A. B. c. D. E. F. G. H. I. J. FIRE DAMPERS Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following: 1. Ruskin Company. Type: Dynamic; rated and labeled according to UL 555 by an NRTL. Closing rating in ducts up to 4-inch wg static pressure class and minimum 4000-fpm velocity. Fire Rating: 1-1/2 hours. Frame: Curtain type with blades outside airstream except when located behind grille where blades may be inside airstream; fabricated with roll-formed, inch- thick galvanized steel; with mitered and interlocking corners. Mounting Sleeve: Factory- or field-installed, galvanized sheet steel. 1. Minimum Thickness: or inch thick, as indicated, and of length to suit application. 2. Exception: Omit sleeve where damper-frame width permits direct attachment of perimeter mounting angles on each side of wall or floor; thickness of damper frame must comply with sleeve requirements. Mounting Orientation: Vertical or horizontal as indicated. Blades: Roll-formed, interlocking, inch- thick, galvanized sheet steel. In place of interlocking blades, use full-length, inch- thick, galvanized-steel blade connectors. Horizontal Dampers: Include blade lock and stainless-steel closure spring. Heat-Responsive Device: Replaceable, 165 deg F rated, fusible links. 2.5 A. B. C. D. FLANGE CONNECTORS Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following: 1. Ductmate Industries, Inc. Description: Add-on or roll-formed, factory-fabricated, slide-on transverse flange connectors, gaskets, and components. Material: Galvanized steel. Gage and Shape: Match connecting ductwork. 2.6 A. B. TURNING VANES Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following: 1. Ductmate Industries, Inc. Manufactured Turning Vanes for Metal Ducts: Curved blades of galvanized sheet steel; support with bars perpendicular to blades set; set into vane runners suitable for duct mounting. PWA /3 AIR DUCT ACCESSORIES

76 1. Acoustic Turning Vanes: Fabricate airfoil-shaped aluminum extrusions with perforated faces and fibrous-glass fill. C. General Requirements: Comply with SMACNA's "HV AC Duct Construction Standards - Metal and Flexible"; Figures 4-3, "Vanes and Vane Runners," and 4-4, "Vane Support in Elbows." D. Vane Construction: Single wall for ducts up to 48 inches wide and double wall for larger dimensions. 2.7 FLEXIDLE CONNECTORS A. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following: 1. Ductmate Industries, Inc. B. Materials: Flame-retardant or noncombustible fabrics. C. Coatings and Adhesives: Comply with UL 181, Class 1. D. Metal-Edged Connectors: Factory fabricated with a fabric strip [3-1/2 inches] [5-3/4 inches] wide attached to 2 strips of2-3/4-inch- wide, inch- thick, galvanized sheet steel or inch- thick aluminum sheets. Provide metal compatible with connected ducts. E. Indoor System, Flexible Connector Fabric: Glass fabric double coated with neoprene. 1. Minimum Weight: 26 oz./sq. yd.. 2. Tensile Strength: 480 lbf/inch in the warp and 360 lbf/inch in the filling. 3. Service Temperature: Minus 40 to plus 200 deg F. F. Outdoor System, Flexible Connector Fabric: Glass fabric double coated with weatherproof, synthetic rubber resistant to UV rays and ozone. 1. Minimum Weight: 24 oz./sq. yd.. 2. Tensile Strength: 530 lbf/inch in the warp and 440 lbf/inch in the filling. 3. Service Temperature: Minus 50 to plus 250 deg F. G. Thrust Limits: Combination coil spring and elastomeric inseti with spring and insert in compression, and with a load stop. Include rod and angle-iron brackets for attaching to fan discharge and duct. 1. Frame: Steel, fabricated for connection to threaded rods and to allow for a maximum of 30 degrees of angular rod misalignment without binding or reducing isolation efficiency. 2. Outdoor Spring Diameter: Not less than 80 percent of the compressed height of the spring at rated load. 3. Minimum Additional Travel: 50 percent of the required deflection at rated load. 4. Lateral Stiffness: More than 80 percent of rated vertical stiffness. 5. Overload Capacity: Support 200 percent of rated load, fully compressed, without deformation or failure. 6. Elastomeric Element: Molded, oil-resistant rubber or neoprene. 7. Coil Spring: Factory set and field adjustable for a maximum of 1/4-inch movement at start and stop. 2.8 FLEXffiLE DUCTS A. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following: 1. Flexmaster U.S.A., Inc. 2. B. Insulated, Flexible Duct: UL 181, Class 1, black polymer film suppotied by helically wound, spring-steel wire; fibrous-glass insulation; polyethylene vapor-barrier film. 1. Pressure Rating: 4-inch wg positive and 0.5-inch wg negative. 2. Maximum Air Velocity: 4000 fpm. PWA /4 AIR DUCT ACCESSORIES

77 3. Temperature Range: Minus 20 to plus 175 deg F. 4. Insulation R-Value: R-7, and comply with ASHRAE/IESNA C. Flexible Duct Connectors: 1. Clamps: Nylon strap in sizes 3 through 18 inches, to suit duct size. 2.9 DUCT ACCESSORY HARDWARE A. Instrument Test Holes: Cast iron or cast aluminum to suit duct material, including screw cap and gasket. Size to allow insertion of pitot tube and other testing instruments and of length to suit duct-insulation thickness. B. Adhesives: High strength, quick setting, neoprene based, waterproof, and resistant to gasoline and grease LOUVERS A. Furnish and install louvers as sized on the drawings, coordinate opening framing with other trades as required for proper opening size and installation. B. Louvers shall be high performance low pressure drop, low water penetration and drainable. C. Louvers performance shall be AMCA Certified and shall meet or exceed the following specifications: 1. Static pressure drop: 0.07" or less at 750 PPM through free area. 2. Water penetration: Beginning point at.01 oz/ft PPM minimum 3. Free Area: 50% minimum D. Louver frame and blades shall be fabricated from 0.80" thick extruded aluminum alloy TS. Blades and jambs shall have integral gutters for drainage of water. Blades shall be at a 37.5' angle on centers not exceeding 6". Each louver shall be designed to withstand a wind load or other load of 20 pounds per square foot. Birdscreen shall be framed, rear mounted, and removable of%" x 0.051" expanded flattened aluminum. E. Where louvers must be made up by multiple sections, the manufacturer shall submit with the shop drawings, all joint locations, methods of bracing/assembly. When the louvers are assembled per the shop drawings they shall meet the above specified structural loading. F. Louvers shall have a 70% PVDF resin finish with a dry film thickness of 1.2 mils. Color to be chosen by the Architect/Engineer from the manufacturer's standard colors at time of shop drawing submittals. PART 3- EXECUTION 3.1 INSTALLATION A. Install duct accessories according to applicable details in SMACNA's "HV AC Duct Construction Standards- Metal and Flexible" for metal ducts and in NAIMA AH116, "Fibrous Glass Duct Construction Standards," for fibrous-glass ducts. PWA /5 AIR DUCT ACCESSORIES

78 B. C. D. E. F. G. H. I. J. K. L. M. N. 0. P. Install duct accessories of materials suited to duct materials; use galvanized-steel accessories in galvanized-steel and fibrous-glass ducts, stainless-steel accessories in stainless-steel ducts, and aluminum accessories in aluminum ducts. Install backdraft dampers at inlet of exhaust fans or exhaust ducts as close as possible to exhaust fan unless otherwise indicated. Install volume dampers at points on all supply and exhaust systems where branches extend from larger ducts. Where dampers are installed in ducts having duct liner, install dampers with hat channels of same depth as liner, and terminate liner with nosing at hat channel. 1. Install steel volume dampers in steel ducts. Set dampers to fully open position before testing, adjusting, and balancing. Install test holes at fan inlets and outlets and elsewhere as indicated. Install fire dampers according to UL listing. Install duct access doors on sides of ducts to allow for inspecting, adjusting, and maintaining accessories and equipment at the following locations: 1. Adjacent to and close enough to fire or smoke dampers, to reset or reinstall fusible links. Access doors for access to fire or smoke dampers having fusible links shall be pressure relief access doors; and shall be outward operation for access doors installed upstream from dampers and inward operation for access doors installed downstream from dampers. 2. Elsewhere as indicated. Install access doors with swing against duct static pressure. Access Door Sizes: 1. One-Hand or Inspection Access: 8 by 5 inches. 2. Two-Hand Access: 12 by 6 inches. 3. Head and Hand Access: 18 by 10 inches. 4. Head and Shoulders Access: 21 by 14 inches. 5. Body Access: 25 by 14 inches. 6. Body plus Ladder Access: 25 by 17 inches. Install flexible connectors to connect ducts to equipment. Connect terminal units to supply ducts with maximum 12-inch lengths of flexible duct. Do not use flexible ducts to change directions. Connect diffusers or light troffer boots to ducts with maximum 60-inch lengths of flexible duct clamped or strapped in place. Connect flexible ducts to metal ducts with draw bands. Install duct test holes where required for testing and balancing purposes. Install thrust limits at centerline of thrust, symmetrical on both sides of equipment. Attach thrust limits at centerline of thrust and adjust to a maximum of 1/4-inch movement during start and stop of fans. 3.2 A. FIELD QUALITY CONTROL Tests and Inspections: 1. Operate dampers to verity full range of movement. 2. Inspect locations of access doors and verity that purpose of access door can be performed. 3. Operate fire and smoke dampers to verity full range of movement and verity that proper heat-response device is installed. 4. Inspect turning vanes for proper and secure installation. END OF SECTION PWA /6 AIR DUCT ACCESSORIES

79 SECTION DIFFUSERS, REGISTERS, AND GRILLES PART 1 - GENERAL 1.1 SUMMARY A. Section Includes: 1. Square ceiling diffusers. 2. Perforated diffusers. 3. Adjustable bar registers and grilles. 4. Fixed face grilles. B. Related Sections: 1. Section "Operable Wall Louvers" and Section "Fixed Louvers" for fixed and adjustable louvers and wall vents, whether or not they are connected to ducts. 2. Section "Air Duct Accessories" for fire and smoke dampers and volume-control dampers not integral to diffusers, registers, and grilles. 1.2 ACTION SUBMITTALS A. Product Data: For each type of product indicated, include the following: 1. Data Sheet: Indicate materials of construction, finish, and mounting details; and performance data including throw and drop, static-pressure drop, and noise ratings. 2. Diffuser, Register, and Grille Schedule: Indicate drawing designation, room location, quantity, model number, size, and accessories furnished. B. Samples: For each exposed product and for each color and texture specified. 1.3 MANUFACTURERS A. Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: 1. Hart & Cooley Inc. 2. Price Industries. 3. Titus. PART 2- PRODUCTS 2.1 CEILING DIFFUSERS A. Square Ceiling Diffuser: 1. Devices shall be specifically designed for variable-air-volume flows. PWA /1 DIFFUSERS, REGISTERS, AND GRILLES

80 2. Material: Steel. 3. Finish: Baked enamel, white. 4. Face Size: As scheduled. 5. Face Style: Plaque. 6. Mounting: Surface or T-bar as scheduled. 7. Pattern: Fixed. 8. Dampers: Butterfly. 9. Accessories: a. Operating rod extension. B. Perforated Diffuser: 1. Devices shall be specifically designed for variable-air-volume flows. 2. Material: Steel backpan and pattern controllers, with steel face. 3. Finish: Baked enamel, white. 4. Face Size: As scheduled. 5. Duct Inlet: Round. 6. Face Style: Flush. 7. Mounting: Surface or T-bar as scheduled. 8. Pattern Controller: None. 9. Dampers: Butterfly. 10. Accessories: a. Equalizing grid. b. Operating rod extension. 2.2 REGISTERS AND GRILLES A. Adjustable Bar Register: 1. Material: Steel. 2. Finish: Baked enamel, white. 3. Face Blade Arrangement: Parallel to short dimension, spaced 3/4 inch apart. 4. Core Construction: Integral. 5. Rear-Blade Arrangement: Parallel to long dimension spaced 3/4 inch apart. 6. Frame: inches wide. 7. Mounting: Countersunk screw. 8. Damper Type: Adjustable opposed blade. B. Adjustable Bar Grille: 1. Material: Steel. 2. Finish: Baked enamel, white. 3. Face Blade Arrangement: Parallel to shmi dimension spaced 3/4 inch apart. 4. Core Construction: Integral. 5. Rear-Blade Arrangement: Parallel to long dimension spaced 3/4 inch apart. 6. Frame: 1-1/4 inches wide. 7. Mounting: Countersunk screw. PWA /2 DIFFUSERS, REGISTERS, AND GRILLES

81 C. Fixed Face Grille: 1. Material: Steel frame, aluminum core. 2. Finish: Baked enamel, white. 3. Face Arrangement: 112-by-1/2-by-1/2-inch grid core. 4. Core Construction: Integral. 5. Frame: 1-1/4 inches wide. 6. Mounting: Lay in. 2.3 A. SOURCE QUALITY CONTROL Verification of Performance: Rate diffusers, registers, and grilles according to ASHRAE 70, "Method of Testing for Rating the Performance of Air Outlets and Inlets." PART 3- EXECUTION 3.1 INSTALLATION A. B. C. Install diffusers, registers, and grilles level and plumb. Ceiling-Mounted Outlets and Inlets: Drawings indicate general arrangement of ducts, fittings, and accessories. Air outlet and inlet locations have been indicated to achieve design requirements for air volume, noise criteria, airflow pattern, throw, and pressure drop. Make final locations where indicated, as much as practical. For units installed in lay-in ceiling panels, locate units in the center of panel. Where architectural features or other items conflict with installation, notify Architect for a determination of final location. Install diffusers, registers, and grilles with airtight connections to ducts and to allow service and maintenance of dampers, air extractors, and fire dampers. 3.2 ADJUSTING A. After installation, adjust diffusers, registers, and grilles to air patterns indicated, or as directed, before starting air balancing. END OF SECTION PWA /3 DIFFUSERS, REGISTERS, AND GRILLES

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83 SECTION COMMERCIAL-KITCHEN HOODS PART 1- GENERAL 1.1 SUMMARY A. This Section includes Type I and Type II commercial kitchen hoods. 1.2 ACTION SUBMITTALS A. Product Data: For the following: 1. Filters/baffles. 2. Fire-suppression systems. 3. Lighting fixtures. 1.3 INFORMATIONAL SUBMITTALS A. Welding cetiificates. B. Field quality-control test reports. 1.4 QUALITY ASSURANCE A. Welding: Qualify procedures and personnel according to AWS Dl.l/D l.im, "Structural Welding Code - Steel," for hangers and supports; and A WS D9.l/D9.1M, "Sheet Metal Welding Code," for joint and seam welding. B. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, Article 100, by a testing agency acceptable to authorities having jurisdiction, and marked for intended use. PART 2 - PRODUCTS 2.1 HOOD MATERIALS A. Stainless-Steel Sheet: ASTM A 666, Type Minimum Thickness: inch. 2. Finish: Comply with SSINA's "Finishes for Stainless Steel" for recommendations for applying and designating finishes. PWA I 1 COMMERCIAL-KITCHEN HOODS

84 a. Finish shall be free from tool and die marks and stretch lines and shall have uniform, directionally textured, polished finish indicated, free of cross scratches. Grain shall run with long dimension of each piece. 3. Concealed Stainless-Steel Surfaces: ASTM A 480/A 480M, No. 2B finish (bright, coldrolled, unpolished finish). 4. Exposed Surfaces: ASTM A 480/A 480M, No.4 finish (directional satin). 5. When polishing is completed, passivate and rinse surfaces. Remove embedded foreign matter and leave surfaces chemically clean. B. Zinc-Coated Steel Shapes: ASTM A 36/A 36M, ASTM A 123/A 123M requirements. zmc coated according to C. Sealant: ASTM C 920; TypeS, Grade NS, Class 25, Use NT. Elastomeric sealant shall be NSF certified for commercial kitchen hood application. Sealants, when cured and washed, shall comply with requirements in 21 CPR, Section , for use in areas that come in contact with food. 1. Color: As selected by Architect from manufacturer's full range. 2. Backer Rod: Closed-cell polyethylene, in diameter larger than joint width. D. E. Sound Dampening: NSF-certified, nonabsorbent, hard-drying, sound-deadening compound for permanent adhesion to metal in minimum 1/8-inch thickness that does not chip, flake, or blister. Gaskets: NSF certified for end-use application indicated; of resilient rubber, neoprene, or PVC that is nontoxic, stable, odorless, nonabsorbent, and unaffected by exposure to foods and cleaning compounds, and that passes testing according to UL A. GENERAL HOOD FABRICATION REQUIREMENTS Welding: Use welding rod of same composition as metal being welded. Use methods that minimize distortion and develop strength and corrosion resistance of base metal. Make ductile welds free of mechanical imperfections such as gas holes, pits, or cracks. 1. Welded Butt Joints: Full-penetration welds for full-joint length. Make joints flat, continuous, and homogenous with sheet metal without relying on straps under seams, filling in with solder, or spot welding. 2. Grind exposed welded joints flush with adjoining material and polish to match adjoining surfaces. 3. Where fasteners are welded to underside of equipment, finish reverse side of weld smooth and flush. 4. Coat concealed stainless-steel welded joints with metallic-based paint to prevent corrosion. B. For metal butt joints, comply with SMACNA's "Kitchen Ventilation Systems & Food Service Equipment Guidelines." C. Form metal with break bends that are not flaky, scaly, or cracked in appearance; where breaks mar uniform surface appearance of material, remove marks by grinding, polishing, and finishing. PWA /2 COMMERCIAL-KITCHEN HOODS

85 D. Sheared Metal Edges: Finish free of burrs, fins, and irregular projections. E. In food zones, as defined in NSF, fabricate surfaces free from exposed fasteners. F. Cap exposed fastener threads, including those inside cabinets, with stainless-steel lock washers and stainless-steel cap (acorn) nuts. G. Fabricate pipe slots on equipment with turned-up edges sized to accommodate service and utility lines and mechanical connections. H. Fabricate enclosures, including panels, housings, and skirts, to conceal service lines, operating components, and mechanical and electrical devices including those inside cabinets, unless otherwise indicated. I. Fabricate equipment edges and backsplashes according to SMACNA's "Kitchen Ventilation Systems & Food Service Equipment Guidelines." J. Fabricate enclosure panels to ceiling and wall as follows: 1. Fabricate panels on all exposed side(s) with same material as hood, and extend from ceiling to top of hood canopy and from canopy to wall. 2. Wall Offset Spacer: Minimum of3 inches. 3. Wall Shelves and Overshelves: Fabricate according to SMACNA's "Kitchen Ventilation Systems & Food Service Equipment Guidelines," with minimum inch-thick, stainless-steel shelf tops. 2.3 A. TYPE I EXHAUST HOOD FABRICATION Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: 1. Captive-Aire Systems. 2. Duke Manufacturing Company. 3. Greenheck Fan Corporation. B. Weld all joints exposed to grease with continuous welds, and make filters/baffles or grease extractors and makeup air diffusers easily accessible for cleaning. 1. Fabricate hoods according to NSF 2, "Food Equipment." 2. Hoods shall be listed and labeled, according to UL 710, by a testing agency acceptable to authorities having jurisdiction. 3. Hoods shall be designed, fabricated, and installed according to NFPA Duct Collars Without Fire Dampers: Minimum inch-thick steel at least 3 inches long, continuously welded to top of hood and at corners. C. Hood Configuration: Exhaust and makeup air. 1. Makeup air shall be introduced by induction inside canopy. If makeup air is not heated, insulate interior of makeup air plenum with high-density insulation having maximum flame-spread and smoke-developed indexes of 25 and 50, respectively. PWA I 3 COMMERCIAL-KITCHEN HOODS

86 2. Makeup air shall be introduced through front of canopy through perforated diffusers. 3. Makeup air shall be introduced through laminar-flow-type, perforated metal panels on front of hood canopy. D. Hood Style: Wall-mounted canopy. E. Filters/Baffles: Removable, stainless-steel. Fabricate stainless steel for filter frame and removable collection cup and pitched trough. Exposed surfaces shall be pitched to drain to collection cup. Filters/baffles shall be tested according to UL 1046, "Grease Filters for Exhaust Ducts," by an NRTL acceptable to authorities having jurisdiction. F. Lighting Fixtures: Surface-mounted, incandescent fixtures with LED lamps with lenses sealed vapotiight. Wiring shall be installed in conduit on hood exterior. Number and location of fixtures shall provide a minimum of 70 fc at 30 inches above finished floor. 1. Light switches shall be mounted on front panel of hood canopy. 2. Lighting Fixtures: Incandescent complying with UL G. Comply with requirements in Section "Direct Digital Control (DOC) System for HV AC" and Section "Sequence of Operations for HV AC DOC" for hood controls. H. Hood Controls: Hood-mounting control cabinet, factory wired to control groups of adjacent hoods, and fabricated of stainless steel. I. Exhaust Fan: On-off switches shall start and stop the exhaust fan. Interlock exhaust fan with makeup air supply fan to operate simultaneously. Interlock exhaust fan with firesuppression system to operate fan(s) during fire-suppression-agent release and to remain in operation until manually stopped. Include red pilot light to indicate fan operation. Motor starters shall comply with Section "Enclosed Controllers." 2. Exhaust Fan Interlock: Factory wire the exhaust fan starters in a single control cabinet for adjacent hoods to operate together. 3. High-Temperature Control: Alarm shall sound and cooking equipment shall shut down before hood discharge temperature rises to actuation temperature of fire-suppression system. 2.4 A. TYPE II EXHAUST HOOD FABRICATION Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: 1. Captive-Aire Systems. 2. Duke Manufacturing Company. 3. Greenheck Fan Corporation. B. Fabricate hoods according to NSF 2, "Food Equipment." C. Fabricate hoods to comply with SMACNA's "HV AC Duct Construction Standards: Metal and Flexible." D. Hood Configuration: Exhaust only. PWA I 4 COMMERCIAL-KITCHEN HOODS

87 E. Hood Type: Heat and vapor removal. F. Hood Style: Wall-mounted canopy. G. Condensate Hood Baffles: Removable, stainless-steel baffles to drain into a hood drain trough, and stainless-steel drain piping. H. Lighting Fixtures: Surface-mounted, incandescent fixtures and LED lamps with lenses sealed vaportight. Wiring shall be installed in stainless-steel conduit on hood exterior. Number and location of fixtures shall provide a minimum of 70 fc at 30 inches above finished floor. 1. Light switches shall be mounted on front panel of hood canopy. 2. Lighting Fixtures: Incandescent complying with UL A. WET-CHEMICAL FIRE-SUPPRESSION SYSTEM Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: 1. Ansul Incorporated; Tyco International. 2. Badger Fire Protection. 3. Kidde Fire Systems. B. Description: Engineered distribution piping designed for automatic detection and release or manual release of fire-suppression agent by hood operator. Fire-suppression system shall be listed and labeled for complying with NFPA 17A, "Wet Chemical Extinguishing Systems," by a qualified testing agency acceptable to authorities having jurisdiction. 1. Steel Pipe, NPS 2 and Smaller: ASTM A 53/A 53M, TypeS, Grade A, Schedule 40, plain ends. 2. Malleable-Iron Threaded Fittings: ASME Bl6.3, Classes 150 and Piping, fusible links and release mechanism, tank containing the suppression agent, and controls shall be factory installed. Controls shall be in stainless-steel control cabinet mounted on hood or wall. Furnish manual pull station for wall mounting. Exposed piping shall be covered with chrome-plated aluminum tubing. Exposed fittings shall be chrome plated. 4. Liquid Extinguishing Agent: Noncorrosive, low-ph liquid. 5. Furnish electric-operated gas shutoff valve with clearly marked open and closed indicator for field installation. 6. Fire-suppression system controls shall be integrated with controls for fans, lights, and fuel supply and located in a single cabinet for each group of hoods immediately adjacent. 7. Wiring shall have color-coded, numbered terminal blocks and grounding bar. Spare terminals for fire alarm, optional wiring to stmt fan with fire alarm, red pilot light to indicate fan operation, and control switches shall all be factory wired in control cabinet with relays or starters. Include spare terminals for fire alarm, and wiring to start fan with fire alarm. PWA I 5 COMMERCIAL-KITCHEN HOODS

88 PART 3 - EXECUTION 3.1 INSTALLATION A. Complete field assembly of hoods where required. 1. Make closed butt and contact joints that do not require filler. 2. Grind field welds on stainless-steel equipment smooth, and polish to match adjacent finish. Comply with welding requirements in Part 2 "General Hood Fabrication Requirements" Article. B. Install hoods and associated services with clearances and access for maintaining, cleaning, and servicing hoods, filters/baffles, grease extractor, and fire-suppression systems according to manufacturer's written instructions and requirements of authorities having jurisdiction. C. Make cutouts in hoods where required to run service lines and to make final connections, and seal openings according to UL D. Securely anchor and attach items and accessories to walls, floors, or bases with stainless-steel fasteners, unless otherwise indicated. E. Install hoods to operate free from vibration. F. Install trim strips and similar items requiring fasteners in a bed of sealant. Fasten with stainlesssteel fasteners at 48 inches o.c. maximum. G. Install sealant in joints between equipment and abutting surfaces with continuous joint backing, unless otherwise indicated. Provide airtight, watertight, vermin-proof, sanitary joints. H. Install lamps, with maximum recommended wattage, in equipment with integral lighting. I. Set initial temperatures, and calibrate sensors. J. Set field-adjustable switches. K. Connect ducts according to requirements in Section "Air Duct Accessories." Install flexible connectors on makeup air supply duct. Weld exhaust-duct connections with continuous liquidtight joint. L. Install fire-suppression ptpmg for remote-mounted suppression systems according to NFPA 17 A, "Wet Chemical Extinguishing Systems." 3.2 FIELD QUALITY CONTROL A. Perform tests and inspections. B. Tests and Inspections: PWA I 6 COMMERCIAL-KITCHEN HOODS

89 1. Test each equipment item for proper operation. Repair or replace equipment that is defective, including units that operate below required capacity or that operate with excessive noise or vibration. 2. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment. 3. Perform hood performance tests required by authorities having jurisdiction. 4. Perform fire-suppression system performance tests required by authorities having jurisdiction. C. Prepare test and inspection reports. END OF SECTION PWA /7 COMMERCIAL-KITCHEN HOODS

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91 SECTION PACKAGED, DIRECT-FIRED, OUTDOOR, HEATING-ONLY MAKEUP-AIR UNITS PART 1- GENERAL 1.1 SUMMARY A. Section includes direct-fired heating and ventilating units. 1.2 ACTION SUBMITTALS A. Product Data: For each type and configuration of outdoor, direct-fired heating and ventilating unit. B. Shop Drawings: For each type and configuration of outdoor, direct-fired heating and ventilating unit. 1. Include plans, elevations, sections, and mounting details. 2. Include details of equipment assemblies. Indicate dimensions, weights, loads, required clearances, method of field assembly, components, and location and size of each field connection. 3. Design Calculations: Calculate requirements for selecting vibration isolators and for designing vibration isolation bases. 1.3 INFORMATIONAL SUBMITTALS A. Sample Warranty: For manufacturer's special warranty. 1.4 CLOSEOUT SUBMITTALS A. Operation and maintenance data. 1.5 QUALITY ASSURANCE A. Comply with NFPA WARRANTY A. Special Warranty: Manufacturer agrees to repair or replace components of direct-fired heating and ventilating units that fail in materials or workmanship within specified warranty period. 1. Warranty Period for Heat Exchangers: Manufacturer's standard, but not less than five years from date of Substantial Completion. PWA /1 PACKAGED, DIRECT-FIRED, OUTDOOR, HEATING-ONLY MAKEUP-AIR UNITS

92 PART 2- PRODUCTS 2.1 MANUFACTURERS A. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: 1. CaptiveAire Systems. 2. Greenheck Fan Corporation. 3. Modine Manufacturing Company. 2.2 SYSTEM DESCRIPTION A. B. Factory-assembled, prewired, self-contained unit consisting of cabinet, supply fan, controls, filters, and direct-fired gas burner to be installed exterior to the building. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application. 2.3 UNIT CASINGS A. General Fabrication Requirements for Casings: 1. Forming: Form walls, roofs, and floors with at least two breaks at each joint. 2. Casing Joints: Sheet metal screws or pop rivets, factory sealed with water-resistant sealant. 3. Factory Finish for Steel and Galvanized-Steel Casings: Apply manufacturer's standard primer immediately after cleaning and pretreating. 4. Air-Handling-Unit Mounting Frame: Formed galvanized-steel channel or structural channel supports, designed for low deflection, welded with integral lifting lugs. 5. Airstream Surfaces: Surfaces in contact with the airstream shall comply with requirements in ASHRAE B. Configuration: Horizontal unit with bottom discharge for roof-mounting installation. C. Cabinet: Galvanized-steel panels, formed to ensure rigidity and supported by galvanized-steel channels or structural channel suppotis with lifting lugs. Duct flanges at inlet and outlet. Pitched roof panels and knockouts with grommet seals for electrical and piping connections and lifting lugs. D. Outer Casing: inch thick steel with heat-resistant, baked-enamel over-corrosionresistant-treated surface in color to match fan section. E. Inner Casing: 1. Burner Section Inner Casing: inch-thick steel. PWA I 2 PACKAGED, DIRECT-FIRED, OUTDOOR, HEATING-ONLY MAKEUP-AIR UNITS

93 2. Internal Insulation: Fibrous-glass duct lining, neoprene coated, comply with ASTM C 1071, Type II, applied on burner and fan sections only. a. Thickness: 2 inches. b. Insulation Adhesive: Comply with ASTM C 916, Type I. c. Density: 1.5 lb/cu. ft.. d. Mechanical Fasteners: Galvanized steel suitable for adhesive, mechanical, or welding attachment to casing without damaging liner when applied as recommended by manufacturer and without causing air leakage. F. Discharge Section: Down-discharge plenum insulated with l-inch, 1.5-lb/cu. ft. fibrous glass. G. Casing Insulation and Adhesive: 1. Materials: ASTM C 1071, Type II. 2. Location and Application: Factory applied with adhesive and mechanical fasteners to the internal surface of section panels downstream from, and including, the heating-coil section. H. Inspection and Access Panels and Access Doors: Formed and reinforced, single- or double-wall and insulated panels of same materials and thicknesses as casing. 2.4 A. ACCESSORIES Hail guards of galvanized steel, painted to match casing. 2.5 A. B. c. D. OUTDOOR-AIR INTAKE HOOD Type: Manufacturer's standard hood or louver. Materials: Match cabinet. Filter: Aluminum, 1 inch cleanable. Configuration: Designed to inhibit wind-driven rain and snow from entering unit. 2.6 A. ROOF CURBS Materials: Galvanized steel with corrosion-protection coating, watertight gaskets, and factoryinstalled wood nailer; complying with NRCA standards. 1. Curb Insulation and Adhesive: Comply with NFPA 90A or NFPA 90B. 2. Thickness: 1 inch. 3. Application: Factory applied with adhesive and mechanical fasteners to the internal surface of curb. a. Liner Adhesive: Comply with ASTM C 916, Type I. b. Mechanical Fasteners: Galvanized steel, suitable for adhesive attachment, mechanical attachment, or welding attachment to duct without damaging liner PWA /3 PACKAGED, DIRECT-FIRED, OUTDOOR, HEATING-ONLY MAKEUP-AIR UNITS

94 when applied as recommended by manufacturer and without causing leakage in cabinet. c. Liner materials applied in this location shall have air-stream surface coated with a temperature-resistant coating or faced with a plain or coated fibrous mat or fabric depending on service air velocity. d. Liner Adhesive: Comply with ASTM C 916, Type I. B. Curb Height: 20 inches. 2.7 SUPPLY-AIRFAN A. Fan Type: Centrifugal, rated according to AMCA 21 0; statically and dynamically balanced, galvanized steel; mounted on solid-steel shaft with heavy-duty, self-aligning, permanently lubricated ball bearings. Bearing rating: L 10 of 60,000 hours. B. Drive: V-belt drive with matching fan pulley and adjustable motor sheaves and belt assembly. C. Mounting: Fan wheel, motor, and drives shall be mounted in fan casing with elastomeric isolators. D. Fan-Shaft Lubrication Lines: Extended to a location outside the casing. 2.8 AIR FILTERS A. Comply with NFP A 90A. B. Cleanable Filters: Cleanable aluminum mesh. 1. Thickness: 2 inch. C. Disposable Panel Filters: Factory-fabricated, flat-panel-type, disposable air filters with holding frames. 2.9 DIRECT-FIRED GAS BURNER A. Description: Factory assembled, piped, and wired; and complying with ANSI Z21.47, "Gas Fired Central Furnaces," and with NFPA 54, "National Fuel Gas Code." 1. CSA Approval: Designed and certified by and bearing label of CSA. 2. Burners: Aluminized steel with stainless-steel inserts. B. Safety Controls: a. Gas Control Valve: Single stage. b. Fuel: Natural gas. c. Minimum Combustion Efficiency: 90 percent. d. Ignition: Electronically controlled electric spark with flame sensor. e. Modulating, 30:1 or better turndown, to maintain discharge air temperature PWA I 4 PACKAGED, DIRECT-FIRED, OUTDOOR, HEATING-ONLY MAKEUP-AIR UNITS

95 1. Vent Flow Verification: Flame rollout switch. 2. Control Transformer: 24-V ac. 3. High Limit: Thermal switch or fuse to stop burner. 4. Purge-period timer shall automatically delay burner ignition and bypass low-limit control. 5. Gas Manifold: Safety switches and controls complying with ANSI standards. 6. Airflow Proving Switch: Differential pressure switch senses correct airflow before energizing pilot. 7. Automatic-Reset, High-Limit Control Device: Stops burner and closes main gas valve if high-limit temperature is exceeded. 8. Safety Lockout Switch: Locks out ignition sequence if burner fails to light after three tries. Controls are reset manually by turning the unit off and on A. B. c. CONTROLS Comply with requirements in Section "Instrumentation and Control for HV AC" and Section "Sequence of Operations for HV AC Controls" for control equipment and sequence of operation. Fan Control: Interlock fan to start with exhaust fan(s) to which this heating and ventilating unit is associated for makeup air. Outdoor-Air Damper Control, 100 Percent Outdoor-Air Units: Outdoor-air damper shall open when supply fan starts, and close when fan stops A. MOTORS Comply with NEMA designation, temperature rating, service factor, and efficiency requirements for motors specified in Section "Common Motor Requirements for HV AC Equipment." PART 3- EXECUTION 3.1 INSTALLATION A. B. c. D. Equipment Mounting: 1. Comply with requirements for vibration isolation devices specified in Section "Vibration Controls for HV AC." Unit Suppmi: Install heating and ventilating unit level on structural curbs. Coordinate wall penetrations and flashing with wall construction. Secure units to structural support with anchor bolts. Install gas-fired units according to NFPA 54, "National Fuel Gas Code." Install controls and equipment shipped by manufacturer for field installation with direct-fired heating and ventilating units. PWA / 5 PACKAGED, DIRECT-FIRED, OUTDOOR, HEATING-ONLY MAKEUP-AIR UNITS

96 E. Roof Curb: Install on roof structure or concrete base, level and secure, according to AHRI Guideline B. Install units on curbs and coordinate roof penetrations and flashing with roof construction specified in Section "Roof Accessories." Secure units to upper curb rail, and secure curb base to roof framing or concrete base with anchor bolts. 3.2 CONNECTIONS A. Drawings indicate general arrangement of piping, fittings, and specialties. 1. Gas Piping: Comply with requirements in Section "Facility Natural-Gas Piping." Connect gas piping with shutoff valve and union, and with sufficient clearance for burner removal and service. Make final connections of gas piping to unit with corrugated, stainless-steel tubing flexible connectors complying with ANSI LC 1/CSA 6.26 equipment connections. B. Drain: Comply with requirements in Section "Sanitary Waste and Vent Piping" for traps and accessories on piping connections to condensate drain pans under condensing heat exchangers. Where installing piping adjacent to heating and ventilating units, allow space for service and maintenance. C. Duct Connections: Connect supply ducts to direct-fired heating and ventilating units with flexible duct connectors. Comply with requirements in Section "Air Duct Accessories" for flexible duct connectors. D. Ground equipment according to Section "Grounding and Bonding for Electrical Systems." E. Connect wiring according to Section "Low-Voltage Electrical Power Conductors and Cables." 3.3 FIELD QUALITY CONTROL A. B. c. Perform tests and inspections. Units will be considered defective if they do not pass tests and inspections. Prepare test and inspection reports. 3.4 ADJUSTING A. B. Adjust initial temperature set points. Set field-adjustable switches and circuit-breaker trip ranges as indicated. 3.5 DEMONSTRATION A. Train Owner's maintenance personnel to adjust, operate, and maintain heating and ventilating units. PWA /6 PACKAGED, DIRECT-FIRED, OUTDOOR, HEATING-ONLY MAKEUP-AIR UNITS

97 END OF SECTION PWA /7 PACKAGED, DIRECT-FIRED, OUTDOOR, HEATING-ONLY MAKEUP-AIR UNITS

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99 VRV MAU SPECIFICATION PART 1: GENERAL 1.01 SECTION INCLUDES A. Roof Mounted Outdoor Air Handling Units REFERENCES A. AFBMA 9- Load Ratings and Fatigue Life for Ball Bearings. B. AMCA 99 -Standards Handbook. C. AMCA 210- Laboratory Methods of Testing Fans for Rating Purposes. D. AMCA 300 -Test Code for Sound Rating Air Moving Devices. E. AMCA 500- Test Methods for Louver, Dampers, and Shutters. F. AHRI 430- Central-Station Air-Handling Units. G. AHRI 435- Application of Central-Station Air-Handling Units. H. ASTMB117- Standard Practice for Operating Salt Spray Apparatus. I. NEMA MG1- Motors and Generators. J. NFPA 70- National Electrical Code. K. SMACNA- HVAC Duct Construction Standards- Metal and Flexible. L. UL 723- Test for Surface Burning Characteristics of Building Materials. M. UL 900- Test Performance of Air Filter Units. N. UL Standard for Heating and Cooling Equipment. 0. UL 94- Test for Flammability of Plastic Materials for Parts in Devices and Appliances. P. IBC 2000, International Building Code. Q. NFPA 90A- Standard for the Installation of Air Conditioning and Ventilating Systems. R. NFPA Building Construction and Safety Code. S. ASH RAE 90.1 Energy Code. T. AHRI Standard Rating Air-to-Air Heat Exchangers for Energy Recovery Ventilation Equipment. U. GSA 2003 Facilities Standard- 5.9 HVAC Systems and Components SUBMITIALS A. Shop Drawings: Indicate assembly, unit dimensions, weight loading, required clearances, construction details, field connection details, and electrical characteristics and connection requirements. Computer generated fan curves for each air handling unit shall be submitted with specific design operating point noted. A computer generated psychometric chart shall be submitted for each cooling coil with design points and final operating point clearly noted. Sound data for discharge, radiated and return positions shall be submitted by octave band for each unit. Calculations for required base rail heights to satisfy condensate trapping requirements of cooling coil shall be included. B. Product Data: 1. Provide literature that indicates dimensions, weights, capacities, ratings, fan performance, finishes of materials, electrical characteristics, and connection requirements. 2. Provide data of filter media, filter performance data, filter assembly, and filter frames. 3. Provide manufacturer's installation instructions. PWA / 1 VARIABLE REFRIGERANT VOLUME MAKEUP AIR UNITS

100 VRV MAU SPECIFICATION 1.04 QUALIFICATIONS A. Manufacturer: Company specializing in manufacturing Air Handler products specified in this section must show a minimum five years documented experience and complete catalog data on total product SAFETY AGENCY LISTED & CERTIFICATION A. Air Handling units shall be cetlus safety listed to conform with UL Standard 1995 and CAN/CSA Standard C22.2 No Units shall be accepted for use in New York City by the Department of Building, MEA E. B. Air handler furnished with plenum fans where applicable, shall be certified in accordance with the central station air handling units certification program, which is based on AHRI Standard DELIVERY, STORAGE, AND HANDLING A. Deliver, store, protect and handle products to site. B. Accept products on site on factory-furnished shipping skids. Inspect for damage. C. Store in clean dry place and protect from construction traffic. Handle carefully to avoid damage to components, enclosures, and finish. PART 2: PRODUCTS 2.01 ACCEPTABLE MANUFACTURERS A. The following manufacturers are approved for use. 1. Daikin McQuay VRV Air Handler shall be the basis of design. 2. Alternate Manufacturers meeting this specification in its entirity that will be considered include: a. Munters Wringer Unit b. Trane OA ASHP 2.02 UNIT CONSTRUCTION A. Fabricate unit with heavy gauge channel posts and panels secured with mechanical fasteners. All panels, access doors, and ship sections shall be sealed with permanently applied bulb-type gasket. Shipped loose gasketing is not allowed. B. Panels and access doors shall be constructed as a 2-inch nominal thick; thermal broke double wall assembly, injected with foam insulation with an R-value of not less than R The inner liner shall be constructed of G90 galvanized steel. 2. The outer panel shall be constructed of G90 galvanized steel. 3. The floor plate shall be constructed as specified for the inner liner. 4. Unit will be furnished with solid inner liners. C. Panel deflection shall not exceed L/240 ratio at 125% of design static pressure, maximum 5 inches of positive or 6 inches of negative static pressure. Deflection shall be measured at the panel midpoint. D. The casing leakage rate shall not exceed.5 cfm per square foot of cabinet area at 5 inches of positive static pressure or 6 inches of negative static pressure (.0025 m3/s per square meter of cabinet area at 1.24 kpa static pressure). PWA /2 VARIABLE REFRIGERANT VOLUME MAKEUP AIR UNITS

101 VRV MAU SPECIFICATION E. Module to module field assembly shall be accomplished with an overlapping, full perimeter internal splice joint that is sealed with bulb type gasketing on both mating modules to minimize on-site labor and meet indoor air quality standards. F. Access doors shall be flush mounted to cabinetry, with minimum of two stainless steel piano-type hinges, latch and full size handle assembly. Access doors shall swing outward for unit sections under negative pressure. Access doors on positive pressure sections, shall have a secondary latch to relieve pressure and prevent injury upon access. G. Provide cross broke roofcap system to divert water from the top surface of the air handler. The rain shed roofcap shall have 2"standing seams covered with splice cap channels to seal top seam. Splice cap shall break down over sides of standing seam to protect the ends of the seam. H. The unit shall have a 6-inch curb ready base for structural rigidity and condensate trapping. The curb-ready base shall be designed with sloped drip pans located under all unit sections except duct openings and shall be supported by frame member. I. Roof curb kit of 20-inch height shall provide support for the air handler on the building roof and provide a weather protected area for terminating and securing the roof membrane. The roof curb kit shall be manufactured by the air handler unit manufacturer FAN ASSEMBLIES A. The fan shall be a high performance direct drive, single inlet, plenum fan with backwards curved high efficiency welded-aluminum or high performance composite impeller with galvanized or aluminum support frame. B. The fan is driven by long-life, low-temperature brush less DC electronically commutated motor {EC Motor) with external rotor and integrated maintenance-free electronic circuitry and electronics. The motor is manufactured with maintenance-free, long-time lubrication ball bearings and shall be statically and dynamically balanced in accordance with ISO 1940 part 1. The motor shall be closed, protection leveiip 54, thermal class 155 with permissible operating temperature of -13 F to 140 F. Motor efficiency class shall comply with IE4. Fan characteristic curves indicate measurements on a chamber test in accordance with IS C. The integral controller shall accept a 0-10 VDC signal for fan speed control, and binary alarm output shall be provided. The fan shall be equipped with a piezometer airflow sensor for airflow measurement COOLING/HEATING COILS 1. Coils shall be of the direct expansion type constructed from copper tubes expanded into aluminum fins to form a mechanical bond. 2. The coil shall be of a waffle louver fin and high heat exchange, rifled bore tube design to ensure highly efficient performance. 3. The coil shall be a 3 row cross fin copper evaporator coil with 13 fpi design completely factory tested. 4. The refrigerant connections shall be flare connections and refrigeration control thermistors will be located on the liquid and gas line. 5. Provide access to coil{s) for service and cleaning. Enclose coil headers and return bends fully within unit casing. PWA /3 VARIABLE REFRIGERANT VOLUME MAKEUP AIR UNITS

102 VRV MAU SPECIFICATION 6. Coil casing shall be a formed channel frame of galvanized steel Fl L TE RS A. Furnish flat filter in mixing box section with 2-inch filter. Provide side loading and removal of filters. B. Filter media shall be UL 900 listed, Class I or Class II. C. Filter Magnehelic gauge(s) shall be furnished and mounted by others ADDITIONAL SECTIONS A. Access section shall be provided for access between components. B. Outside Air Inlet section shall be provided with end outside air opening with inlet hood and shall have parallel blade low leak airfoil damper blades. Dampers shall be hollow core galvanized steel airfoil blades, fully gasketed and have continuous vinyl seals between damper blades in a galvanized steel frame. Dampers shall have stainless steel jamb seals along end of dampers. Return and Exhaust air dampers of different sizes must be driven separately. Exhaust Damper shall be located on the side of the unit and shall have a rain hood. Damper Leakage: Leakage rate on dampers shall be less than two tenths of one percent leakage at 2 inches static pressure differential. Leakage rate tested in accordance with AMCA Standard 500. C. Energy recovery wheel shall be constructed of corrugated synthetic fibrous media, with a desiccant intimately bound and uniformly and permanently dispersed throughout the matrix structure of the media. Rotors with desiccants coated bonded, or synthesized onto the media are not acceptable due to delaminating or erosion of the desiccant material. Media shall be synthetic to provide corrosion resistance and resistance against attack from laboratory chemicals present in pharmaceutical, hospital, etc. environments as well as attack from external outdoor air conditions. Coated aluminum is not acceptable. Face flatness of the wheel shall be maximized in order to minimize wear on inner seal surfaces and to minimize cross leakage. Rotor shall be constructed of alternating layers of flat and corrugated media. Wheel layers should be uniform in construction forming uniform aperture sizes for airflow. Wheel construction shall be fluted or formed honeycomb geometry so as to eliminate internal wheel bypass. Wheel layers that can be separated or spread apart by airflow are unacceptable due to the possibility of channeling and performance degradation. The minimum acceptable performance shall be as specified in the unit schedule. Desiccant Material: The desiccant material shall be a molecular sieve, and specifically a 4A or smaller molecular sieve to minimize cross contamination. Wheel Media Support System: The wheel frames shall consist of evenly spaced steel spokes, galvanized steel outer band and rigid center hub. The wheel construction should allow for post fabrication wheel alignment. Wheel Seals: The wheel seals shall be full contact nylon brush seals or equivalent. Seals should be easily adjustable. Wheel cassette: Cassettes shall be fabricated of heavy duty reinforced galvanized steel or welded structural box tubing. Cassettes shall have a built in adjustable purge section minimizing cross contamination of supply air as shown on unit schedule. Bearings shall be inboard, zero maintenance, permanently sealed roller bearings, or alternatively, external flanged or pillow block bearings. Drive systems shall consist of fractional horsepower AC drive motors with multi-link drive belts. Face and bypass dampers shall be furnished as shown on unit schedule and drawings. Certification: The wheel shall be AHRI certified by the energy recovery wheel supplier to AHRI Standard 1060 and must bear the PWA /4 VARIABLE REFRIGERANT VOLUME MAKEUP AIR UNITS

103 VRV MAU SPECIFICATION AHRI certification stamp. Private independent testing performed "in accordance with" various standards is not a substitute for AHRI certification and shall not be accepted. The wheel shall be listed or recognized by UL or equivalent. D. If required a sensible wheel (located in the reheat position and similar to the above) shall be located in separate section downstream of the heating cooling coils. PART 2: CONTROLS A. A BTL listed Bacnet controller with the following shall be provided B. Controller shall be provided with built in web server C. Controller shall be provided with controller-mounted LCD display and dial/button adjustability. D. Built-in 1/0 to control all functions of the machine including but not limited to following: I. Outdoor and exhaust damper positions 2. Fan motor speed 3. Enthalpy Wheel Control 4. Sensible Wheel Control 5. Energy Wheel Defrost Strategy 6. Heating/Cooling Set points for DAC of primary and exhaust coil 7. Exhaust Coil Control E. Occupied unoccupied scheduling via the Central Building Management System F. Provide, mount and wire all sensors required to accomplish the above internal to the unit. Refer to points list and sequence of operation for full functionality requirements. PART 2: EXECUTION 2.01 INSTALLATION A. Install in accordance with manufacturer's Installation & Maintenance instructions ENVIRONMENTAL REQUIREMENTS A. Do not operate units for any purpose, temporary or permanent, until ductwork is clean, filters are in place, bearings lubricated, fan has been test run under observation and building is ready for occupancy by the owner EXTRA MATERIALS A. Provide one extra set fan belts, filters, for each unit as shown on project schedule. PWA /5 VARIABLE REFRIGERANT VOLUME MAKEUP AIR UNITS

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105 SECTION COMPUTER-ROOM AIR-CONDITIONERS, FLOOR-MOUNTED UNITS (7 TONS (25 KW) AND LARGER) PART 1- GENERAL 1.1 SUMMARY A. Section includes floor-mounted, computer-room air conditioners of 7 tons and larger. 1.2 ACTION SUBMITTALS A. Product Data: For each type of product. B. Shop Drawings: For computer-room air conditioners. 1. Include plans, elevations, sections, and attachment details. 2. Include details of equipment assemblies. Indicate dimensions, weights, loads, required clearances, method of field assembly, components, and location and size of each field connection. 3. Include diagrams for power, signal, and control wiring. C. Color Samples: For unit cabinet, discharge grille, and exterior louver and for each color and texture specified. 1.3 INFORMATIONAL SUBMITTALS A. Coordination Drawings: Plans, elevations, and other details, drawn to scale, using input from installers of the items involved. B. Field quality-control reports. C. Sample warranty. 1.4 CLOSEOUT SUBMITTALS A. Operation and maintenance data. 1.5 WARRANTY A. Special Warranty: Manufacturer agrees to repair or replace components of computer-room air conditioners that fail in materials or workmanship within specified warranty period. PWA I COMPUTER-ROOM AIR CONDITIONERS, FLOOR-MOUNTED UNITS (7 TONS (25 K W) AND LARGER)

106 1. Warranty Period for Compressors: Manufacturer's standard, but not less than five years from date of Substantial Completion. 2. Warranty Period for Humidifiers: Manufacturer's standard, but not less than three years from date of Substantial Completion. 3. Warranty Period for Control Boards: Manufacturer's standard, but not less than three years from date of Substantial Completion. PART 2- PRODUCTS 2.1 MANUFACTURERS A. Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: PERFORMANCE REQUIREMENTS A. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFP A 70, by a qualified testing agency, and marked for intended location and application. B. ASHRAE Compliance: 1. Fabricate and label refrigeration system to comply with ASHRAE 15, "Safety Standard for Refrigeration Systems." 2. ASHRAE Compliance: Applicable requirements in ASHRAE 62.1, Section 4 - "Outdoor Air Quality," Section 5 - "Systems and Equipment," Section 6 - "Ventilation Rate Procedures," and Section 7 - "Construction and Startup." C. ASHRAE/IES Compliance: Applicable requirements in ASHRAE/IES MANUFACTURED UNITS A. Description: Self-contained, factory assembled, prewired, and prepiped; consisting of cabinet, fan, filters, and controls; for vertical floor mounting in upflow or downflow configuration. B. Cabinet and Frame: Welded tubular-steel frame with removable [single] [double]-thick steel panels and insulated with l-inch-thick duct liner. C. Supply-Air Fan: 1. Forward curved, double width, double inlet, centrifugal, with adjustable V-belt drive. D. Refrigeration System: PWA COMPUTER-ROOM AIR CONDITIONERS, FLOOR-MOUNTED UNITS (7 TONS (25 KW) AND LARGER)

107 1. Compressor: Scroll, variable capacity with oil strainer, internal motor overload protection, resilient suspension system, and crankcase heater. 2. Refrigeration Circuit: a. Two independent circuits with hot-gas mufflers. b. Low-pressure switch. c. Manually reset, high-pressure switch. d. Thermal-expansion valve with external equalizer. e. Sight glass with moisture indicator. f. Service shutoff valves. g. Charging valves. h. Hot-gas bypass. i. Refrigerant charge. 3. Refrigerant: R-407C. 4. Refrigerant Evaporator Coil: Direct-expansion coil of seamless copper tubes expanded into aluminum fins, with two circuits, each with solenoid valve. a. Mount stainless-steel drain pan complying with ASHRAE 62.1 under coil assembly. 5. Remote Air-Cooled Refrigerant Condenser: a. Integral, copper-tube aluminum-fin coil. b. Condenser with transient voltage surge suppression and locking disconnect in the enclosed electrical panel section. 6. Fan: Direct-drive, variable-speed propeller type. 7. Fan: Direct-drive, variable-speed centrifugal type. 8. Split system shall have suction- and liquid-line compatible fittings and refrigerant piping for field interconnection. E. Electric-Resistance Reheat Coil: 1. Finned-tube electric elements with contactor and high-temperature-limit switches. 2. SCR to proportionally control the reheat elements providing precise temperature control. F. Final Filter: 4-inch-thick, disposable, pleated, glass-fiber media. 1. Final Filter MERV Rating: 8 according to ASHRAE G. Infrared Humidifier: Self-contained, microprocessor-controlled unit with high-intensity infrared quartz lamps and stainless-steel steam dispersion tube. 1. Plumbing Components and Valve Bodies: Plastic, linked by flexible rubber hosing, with water fill with air gap and solenoid valve incorporating built-in strainer, pressurereducing and flow-regulating orifice, and drain with integral air gap. 2. Control: Fully modulating to provide gradual modulation from zero to 100 percent capacity with field-adjustable maximum capacity; with high-water probe. 3. Drain Cycle: Field-adjustable drain duration and drain interval. PWA COMPUTER-ROOM AIR CONDITIONERS, FLOOR-MOUNTED UNITS (7 TONS (25 KW) AND LARGER)

108 H. Disconnect Switch: Non-locking disconnect with handle accessible with the door closed. I. Disconnect Switch: Non-locking, non-automatic, molded-case circuit breaker with handle accessible when panel is closed and capable of preventing access until switched to off position. J. Control System: 1. Microprocessor unit-mounted panel. 2. Fan contactor. 3. Compressor contactor. 4. Compressor start capacitor. 5. Control transformer with circuit breaker. 6. Solid-state temperature- and humidity-control modules. 7. Humidity contactor. 8. Time-delay relay. 9. Heating contactor. 10. Smoke sensor. 11. High-temperature thermostat. 12. Remote panel to monitor and change temperature and humidity set points and sensitivities of the unit and unit alarms. K. Fan Motors: 1. Motor Sizes: Minimum size as indicated. If not indicated, large enough so driven load does not require motor to operate in service factor range above Controllers, Electrical Devices, and Wiring: Comply with requirements for electrical devices and connections specified in electrical Sections. 3. Type: Open dripproof. PART 3- EXECUTION 3.1 INSTALLATION A. B. C. Layout and install computer-room air conditioners and suspension system coordinated with other construction that penetrates ceilings or is supported by them, including light fixtures, HV AC equipment, fire-suppression system, and partition assemblies. Install computer-room air conditioners coordinated with computer-room access flooring Installer. Install computer-room air conditioners level and plumb, maintaining manufacturer's recommended clearances. Install according to AHRI Guideline B. 3.2 CONNECTIONS A. Piping installation requirements are specified in other heating, ventilating, and air-conditioning Sections. Drawings indicate general arrangement of piping, fittings, and specialties. PWA COMPUTER-ROOM AIR CONDITIONERS, FLOOR-MOUNTED UNITS (7 TONS (25 KW) AND LARGER)

109 B. c. D. Where installing piping adjacent to computer-room air conditioners, allow space for service and maintenance. Plumbing Connections: Comply with applicable requirements in Section "Domestic Water Piping" and Section "Sanitary Waste and Vent Piping." Provide adequate connections for water-cooled units, condensate drain, and humidifier flushing system. Refrigerant Piping: Comply with applicable requirements in Section "Refrigerant Piping." Provide shutoffvalves and piping. 3.3 FIELD QUALITY CONTROL A. Perform the following tests and inspections with the assistance of a factory-authorized service representative: 1. Inspect for and remove shipping bolts, blocks, and tie-down straps. 2. After installing computer-room air conditioners and after electrical circuitry has been energized, test for compliance with requirements. 3. Operational Test: After electrical circuitry has been energized, start units to confirm proper motor rotation and unit operation. 4. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment. B. c. D. Computer-room air conditioners will be considered defective if they do not pass tests and inspections. Prepare test and inspection reports. After startup service and performance test, change filters and flush humidifier. 3.4 DEMONSTRATION A. Train Owner's maintenance personnel to adjust, operate, and maintain computer-room air conditioners. END OF SECTION New Southwest Elementaty School PWA COMPUTER-ROOM AIR CONDITIONERS, FLOOR-MOUNTED UNITS (7 TONS (25 KW) AND LARGER)

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111 SECTION VARIABLE REFRIGERANT VOLUME AIR CONDITIONING EQUIPMENT PART 1- GENERAL 1.1 SYSTEM DESCRIPTION The variable capacity, heat recovery air conditioning system shall consist of multiple evaporators, branch selector boxes, joints and headers, a three pipe refrigeration distribution system using PID control and variable refrigerant volume condenser unit. The condenser shall be a direct expansion (DX), air-cooled heat recovery, multi-zone airconditioning system with variable speed inverter driven compressors using R-41 OA refrigerant. The condensing unit may connect an indoor evaporator capacity up to 200% of the condensing unit capacity. All zones are each capable of operating separately with individual temperature control. A dedicated hot gas pipe shall be required to ensure optimum heating operation performance. Two-pipe, heat recovery systems utilizing a lower temperature mixed liquid/gas refrigerant to perform heat recovery are not acceptable due to reduced heating capabilities The condensing unit shall be interconnected to indoor units and shall have capacity as indicated on plans. The indoor units shall be connected to the condensing unit utilizing manufacturer's specified piping joints and headers to ensure correct refrigerant flow and balancing. T style joints are not acceptable. Operation of the system shall permit either individual cooling or heating of each indoor unit simultaneously or all of the indoor units associated with one branch cool/heat selector box. Each indoor unit or group of indoor units shall be able to provide set temperature independently via (used selectable) a local remote controller or a BMS interface. Branch selector boxes shall be located as shown on the drawing. The branch selector boxes shall have the capacity shown on plans down stream of the branch selector box. The branch selector box shall consist of valves, refrigerant control piping and electronics to facilitate communications between the box and main processor and between the box and indoor units. The branch selector box shall control the operational mode of the subordinate indoor units. The Basis-of-design Daikin REYQ condensing unit model numbers and the associated number of connectable indoor units per REYQ condensing unit are indicated in the following table. Each indoor unit or group of indoor units shall be independently controlled. Model Number Nominal Capacity (Tons) REYQ72PBTJ 6 REYQ96PPBTJ 8 REYQ120PBTJ 10 REYQ144PBTJ 12 REYQ 168PBTJ 14 REYQ 192PBTJ 16 REYQ216PBTJ 18 REYQ240PBTJ 20 REYQ264PBTJ 22 REYQ288PBTJ 24 REYQ312PBTJ 26 REYQ336PBTJ 28 Number of Connectable Indoor Units PWA / 1 VARIABLE REFRIGERANT VOLUME AIR CONDITIONING EQUIPMENT

112 1.2 REQUIRED FEATURES A. Voltage Platform -Heat recovery condensing units shall be available with a V/3/60 power supply. B. Advanced Zoning- A single system shall provide for the number of zones shown on plans, plus 5. C. Autocharging- Each system shall have a refrigerant auto-charging function. D. Defrost Heating- Each system shall maintain continuous heating during defrost operation. E. Oil Return Heating- Each system shall maintain continuous heating during oil return operation. F. Independent Control - Each indoor unit shall use a dedicated electronic expansion valve for independent control. G. VFD Inve1ier Control- Each condensing unit shall use a high efficiency, variable speed "inverter" compressor coupled with inverter fan motors for superior part load performance. Compressor capacity shall be modulated automatically to maintain constant suction and condensing pressures while varying the refrigerant volume for the needs of the cooling or heating loads. Indoor units shall use PID control to control superheat to deliver a comf01iable room temperature condition. H. Flexible Design- 1. Systems shall be capable of linear piping distances shown on plans between the condensing unit and furthest located indoor unit. 2. Systems shall be capable of"one-way" piping lengths shown on plans, in the piping network. 3. Systems shall have a vertical (height) separation of up to 100 ft between the condensing unit and the indoor units. 4. Systems shall be capable of distance shown on plans, from the first branch point. 5. The condensing unit shall have the ability to connect an indoor unit evaporator capacity up to 200% of the condensing unit capacity. 6. Systems shall be capable of lengths shown on plans between indoor units. 7. Condensing units shall be supp01ied with a fan/fan motor ESP up to 0.32" WG as standard to allow connection of discharge ductwork and to prevent discharge air short circuiting. I. Simple Wiring- Systems shall use 18 A WG, 2 wire, multi-stranded, non-shielded and nonpolarized daisy chain control wiring. J. Energy Efficiency- System shall have equivalent or better performance than high efficiency air cooled or water cooled chiller systems. K. Outside Air- Systems shall provide outside air capability. L. Advanced Diagnostics - Systems shall include a self diagnostic, auto-check function to detect a malfunction and display the type and location. M. Each condensing unit shall incorporate contacts for electrical demand shedding. N. Advanced Controls- Each system shall have at least one remote controller capable of controlling up to 16 indoor units. Each system shall be capable of integrating with open protocol BACnet and Lon Works building management systems. 0. Low Sound Levels- Each system shall use indoor and condensing units with quiet operation to equal basis of design units. 1.3 QUALITY ASSURANCE A. The units shall be tested by a Nationally Recognized Testing Laboratory (NRTL), in accordance with ANSI/UL Heating and Cooling Equipment and bear the Listed Mark. B. All wiring shall be in accordance with the National Electric Code (NEC). C. The system shall be factory tested for safety and function. D. Mechanical equipment for wind-born debris regions shall be designed in accordance with ASCE and installed to resist the wind pressures on the equipment and the supports. E. The condensing unit will be factory charged with R-41 OA. 1.4 DELIVERY, STORAGE, AND HANDLING PWA /2 VARIABLE REFRIGERANT VOLUME AIR CONDITIONING EQUIPMENT

113 A. Unit shall be stored and handled according to the manufacturer's recommendations. 1.5 MANUFACTURERS A. THE HV AC Equipment Basis of Design is Daikin AC. B. If any other manufacturer of equipment is proposed as an alternate for the VRF System, the contractor shall be responsible for all charges to provide the alternate manufacturer including the following: a. All mechanical and electrical changes including P.E. sealed drawings b. All structural and clearance changes engineering including P.E. sealed drawings c. Provisions for supplemental electric heat for each fan coil unit if proposed manufacturer falls short of specified outdoor unit heating capacity at -4 F. d. Confirmation that proposed manufacturer meets or exceeds COP's at -4 F e. Provisions to prove that proposed alternate meets or exceeds efficiencies of specified system f. Confirmation that in the event of a compressor failure of an outdoor unit that the redundant compressor can operate to continue to heat and cool. C. If any other manufacturer of equipment is proposed as an alternate for the VRF System, the contractor shall be responsible for submitting as part of the equipment data package data sheets including: a. Cooling BTU/h at project design conditions b. Cooling Input Power (kw) c. Full Load EER d. leer per AHRI 1230 e. Heating BTU/h at project design conditions f. Heating Input Power (k W) g. Full Load COP h. Electrical characteristics (MCA and MOP) for all indoor units and condensing units. i. Sound pressure level (db(a)) at 3ft. for outdoor units and 5 ft. for indoor units. k. Confirmation in writing that system will continue to heat to -30 F ambient. I. Documented capacity tables showing heating capacity at -15 F ambient. 1.6 INSTALLATION REQUIREMENTS A. INSTALLER QUALIFICATIONS: The system must be installed by a manufacturer-trained contractor/dealer. 1. The bidders shall be required to submit training cetiification proof with bid documents. 2. The installing contractor must submit with bid documents documentation of successful installation of variable refrigerant volume systems of the manufacturer and models included in the bid, covering a total conditioned floor area of at least 100,000 square feet in at least three separate locations combined. These systems must have been installed with his manpower and under his direct supervision. The contractor must furnish contact information for individuals employed at these locations and with knowledge of the systems, at these locations that can verify the successful installation and start-up, operations of the systems, and follow-up support of the contractor with these installed systems. 3. Verification of this information and references from these individuals is a requirement for the General Contractor's bid to be considered responsive. The General Contractor is responsible to confirm that the VRV contractors and equipment manufacturers are qualified based on these requirements prior to bid. Failure to successfully do so will disqualify his bid. PWA /3 VARIABLE REFRIGERANT VOLUME AIR CONDITIONING EQUIPMENT

114 B. The mechanical contractor's installation price shall be based on the system's installation requirements. The mechanical contractor bids with complete knowledge of the HV AC system requirements. PART 2- PERFORMANCE 2.1 EFFICIENCY A. The condensing unit and combined systems shall perform to meet minimum leer ratings of the basis of design units, per certified AHRI 1230 ratings. 2.2 OPERATING RANGE A. The operating range in cooling will be (-4 F) 23 F DB~ 110 F DB. B. Each system as standard shall be capable of on site reprogramming to allow low ambient cooling operation to -4 F DB. C. The system shall be capable of delivering the specified heat capacities in the range of outdoor temperatures of -4 F DB- 77 F DB I -4 F WB- 60 F WB. Simultaneous cooling/heating operating range will be (-4 F) 23 F WB ~ 60 F WB. Heating performance curves shall be submitted with submittals showing capacity to -15 F and unit shall continue to heat and not shut down until 2.3 D. E. A. ambient temperature reaches -40 F. Cooling mode indoor room temperature range will be 62 F -77 F WB. Heating mode indoor room temperature range will be 59 F-80 F DB. REFRIGERANT PIPING The system shall be capable of refrigerant piping up to equivalent lengths shown on plans from the condensing unit to the furthest indoor unit, a total combined liquid line length shown on plans of piping between the condensing and indoor units with 100 feet maximum vertical difference, without any oil traps. B. Piping joints and headers shall be used to ensure proper refrigerant balance and flow for optimum system capacity and performance. T style joints shall not be acceptable as this will negatively impact proper refrigerant balance and flow for optimum system capacity and performance. PART 3- PRODUCTS 3.1 CONDENSING UNIT A. General: The condensing unit is designed specifically for use with VRVIII series components. 1. The condensing unit shall be factory assembled and pre-wired with all necessary electronic and refrigerant controls. The refrigeration circuit of the condensing unit shall consist of scroll compressors, motors, fans, condenser coil, electronic expansion valves, solenoid valves, 4-way valve, distribution headers, capillaries, filters, shut off valves, oil separators, service ports and refrigerant regulator. High/low pressure gas line, liquid and suction lines must be individually insulated between the condensing and indoor units. 2. The connection ratio of indoor units to condensing unit shall be permitted up to 150%. 3. Each condensing system shall be able to support the connection of up to 58 indoor units dependant on the model of the condensing unit. 4. The system will automatically restart operation after a power failure and will not cause any settings to be lost, thus eliminating the need for reprogramming. 5. The condensing unit shall be modular in design and should allow for side-by-side installation with minimum spacing. 6. The following safety devices shall be included on the condensing unit; high pressure sensor and switch, low pressure sensor, control circuit fuses, crankcase heaters, fusible plug, overload relay, invetter overload protector, thermal protectors for compressor and fan motors, over current protection for the inverter and anti-recycling timers. 7. To ensure the liquid refrigerant does not flash when supplying to the various indoor units, the circuit shall be provided with a sub-cooling feature. PWA /4 VARIABLE REFRIGERANT VOLUME AIR CONDITIONING EQUIPMENT