WELD COUNTY SOUTHWEST BUILDING HVAC EVALUATION 4209 COUNTY ROAD 24 ½, FIRESTONE, COLORADO August 4, 2017

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1 WELD COUNTY SOUTHWEST BUILDING HVAC EVALUATION 4209 COUNTY ROAD 24 ½, FIRESTONE, COLORADO August 4, 2017 We were contracted by Weld County to review the existing drawings and installed mechanical equipment to identify the required replacement capacity, configuration, and installation options. The Weld County Southwest is a single-story building, that was originally constructed in The existing rooftop units are constant volume that include DX cooling and two stages of natural gas fired heating. Most of the existing units are constant volume bypass (VVT) and have been known to trip often when they shift from the first stage of heat to the second stage of heat. In order to reset the safety, it requires the facilities maintenance staff to get on the roof which at times can be snowy (and slippery) and this creates a serious safety issue for the staff. Therefore, given these units are near the end of their useful operational life, the intent of this project is to remove the existing Carrier rooftop units and replace them with new rooftop units. The mechanical contractor will be responsible for removal and disposal of the existing rooftop units. The new rooftop units will be placed in the same exact locations as the existing units. This will greatly reduce the scope of work and cost of the project. The existing natural gas piping will need to be disconnected and reconnected after the new units are installed. The electrical contractor will be responsible for checking the breaker and wire sizing of the existing system. The mechanical contractor shall provide a curb adapter to accommodate the new rooftop unit footprints. The contractor shall replace any duct insulation where removed to facilitate unit replacement. The mechanical contractor shall reconnect to existing supply and return ductwork with flexible connections. Reconfigure the controls system to interconnect with the new units and a TAB contractor shall test newly installed rooftop units, verify operation of fan performance, heating and cooling, set outside air dampers, and shall rebalance the existing system and verify the diffuser airflow matches the original design airflows in each existing tenant space and will provide a final TAB report documenting this data. Attached to this report is the mechanical rooftop unit schedule and mechanical specifications for the packaged rooftop units and TAB requirements. In addition to providing this study for the unit replacements for Weld County s use, we will also review the HVAC submittals prepared by the contractor for the new units. If you have any further questions, please feel free to contact me directly. Respectfully, Alex Arnold, PE Mechanical Project Engineer AlexArnold@GallowayUS.com

2 In graphical format, the areas in which each rooftop unit serve, in addition to the locations of the units themselves, are as follows:

3 PACKAGED CONSTANT VOLUME ROOFTOP HEATING AND COOLING UNIT SCHEDULE SUPPLY FAN DATA COIL DATA ELECTRICAL APPROX. SYMBOL SERVICE MANUFACTURER MODEL NOMINAL CFM CFM EXT. STATIC HEATING HEATING HEATING HEATING GROSS COOLING COOLING COOLING COOLING COOLING COOLING NUMBER VOLT / OPER. NOTES TONS TOTAL O.A. PRESSURE MBH INPUT MBH OUTPUT STAGES EAT TOTAL SENSIBLE EAT EAT LAT LAT COMP. PHASE MCA (IN) (MBH) 5300' (MBH) CAPACITY DRY BULB WET BULB DRY BULB WET BULB LBS RTU-1 SOUTH WING SOUTH AREAS TRANE YHD ,010 1, / V ,186 ALL RTU-2 SOUTH WING WEST AREAS TRANE YHD ,030 1, / V ,186 ALL RTU-3 SOUTH WING EAST AREAS TRANE YHC , / V ,259 ALL RTU-4 NORTH WING NORTHEAST AREAS TRANE YHC , V ,035 ALL RTU-5 NORTH WING SOUTH AREAS TRANE YHD ,050 1, / V ,257 ALL RTU-6 NORTH WING NORTHWEST AREAS TRANE YHC , / V ,058 ALL RTU-7 ENTRY TOWER / LOBBY TRANE YHD ,060 1, / V ,257 ALL NOTES: 1. ACCEPTABLE MANUFACTURERS INCLUDE DAIKEN, MCQUAY AND YORK. 2. ALL RTU'S HAVE BELT-DRIVEN BLOWERS. FIELD ADJUST SUPPLY FAN RPM TO PROVIDE AIR QUANTITIES AS SCHEDULED. 3. PROVIDE HAILGUARDS. 4. EXTERNAL STATIC PRESSURE DOES NOT INCLUDE LOSSES FOR UNIT CASING, FILTERS, HEAT EXCHANGER(S), OR EVAPORATIVE COOLING MEDIA. 5. BURNER SHALL BE DESIGNED TO FIRE ON NATURAL GAS, 7" WC. 6. COOLING COIL CAPACITY BASED ON 95F AMBIENT AT CONDENSER. 7. PROVIDE WITH DUCT SMOKE DETECTOR MOUNTED IN RETURN DUCT. MECHANICAL CONTRACTOR SHALL PROVIDE INSTALLATION, ELECTRICAL CONTRACTOR SHALL PROVIDE DUCT SMOKE DETECTOR AND WIRING TO FACP. 8. PROVIDE CURB ADAPTER. 9. REUSE EXISTING THERMOSTATS AND EXTEND CONTROL WIRE AS NECESSARY. 10. ECONOMIZER SYSTEM INCLUDING AUTOMATIC OUTSIDE AIR, RETURN AIR, RELIEF AIR DAMPERS, MIXED AIR CONTROLLER.

4 PART 1 GENERAL 1.1 SECTION INCLUDES SECTION PACKAGED ROOFTOP UNITS 1. Rooftop air conditioners 20 tons and smaller. RELATED REQUIREMENTS 2. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section. 3. Section Testing, Adjusting, and Balancing General. 1.2 REFERENCE STANDARDS 1. AHRI 210/240 - Standard for Performance Rating of Unitary Air Conditioning and Air-Source Heat Pump Equipment; Air-Conditioning, Heating, and Refrigeration Institute; AHRI Sound Rating of Outdoor Unitary Equipment; Air-Conditioning, Heating, and Refrigeration Institute; NFPA 90A - Standard for the Installation of Air-Conditioning and Ventilation Systems; National Fire Protection Association; DEFINITIONS 1. DDC: Direct-digital controls. 1.4 PERFORMANCE REQUIREMENTS 1. Refer to mechanical rooftop schedule 1.5 SUBMITTALS 1. Refer to Owner for specific requirements for submittal procedures. 2. Shop Drawings: Indicate capacity and dimensions of manufactured products and assemblies required for this project. Indicate electrical service with electrical characteristics and connection requirements, and duct connections. 3. Detail equipment assemblies and indicate dimensions, weights, loads, required clearances, method of field assembly, components, and location and size of each field connection. 4. Field quality-control test reports. 5. Manufacturer's Instructions: Indicate assembly, support details, connection requirements, and include start-up instructions. Weld County PACKAGED ROOFTOP UNITS

5 6. Operation and Maintenance Data: Include manufacturer's descriptive literature, operating instructions, installation instructions, maintenance and repair data, and parts listing. 1. For rooftop air conditioners to include in emergency, operation, and maintenance manuals. 7. Warranty: Submit manufacturer's warranty and ensure forms have been filled out in Owner's name and registered with manufacturer. 1. Provide owner with copy of forms before turnover. 8. Maintenance Materials: Furnish the following for Owner's use in maintenance of project. 1. Extra Filters: One set for each unit. 2. Fan Belts: One set for each belt-drive fan. 1.6 QUALITY ASSURANCE 1. Manufacturer Qualifications: Company specializing in manufacturing the type of products specified in this section, with minimum 5 years of documented experience. 2. Products Requiring Electrical Connection: Listed and classified by Underwriters Laboratories Inc. as suitable for the purpose specified and indicated. 3. 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. 4. Fabricate and label refrigeration system to comply with ASHRAE 15, "Safety Code for Mechanical Refrigeration." 5. ARI Certification: Units shall be ARI certified and listed. 1.7 COORDINATION 1. Coordinate size, location, and installation of rooftop manufacturer's roof curbs and equipment supports with roof installer. 1. Coordinate installation of restrained vibration isolation roof-curb rails. 1.8 DELIVERY, STORAGE, AND HANDLING 1. Protect units from physical damage by storing off site until roof mounting curbs are in place, ready for immediate installation of units. 1.9 WARRANTY 1. Provide a five year warranty to include coverage for refrigeration compressors. 2. Special Warranty: Manufacturer's standard form in which manufacturer agrees to replace components of rooftop air conditioners that fail in materials or workmanship within specified warranty period. 1. Warranty Period for Compressors: Manufacturer's standard, but not less than five year from date of Substantial Completion. PART 2 PRODUCTS 2.1 MANUFACTURERS 1. In other Part 2 articles where subparagraph titles below introduce lists, the following requirements apply for product selection: The manufacturers listed below are invited to bid this project. Standard units that do not have the features described in this specification and shown on the plans will not be acceptable Weld County PACKAGED ROOFTOP UNITS

6 2.2 ROOFTOP AIR CONDITIONERS 20 TONS AND SMALLER 1. Manufacturers 1. Trane Company (The); North American Commercial Group 2. McQuay International 3. YORK International Corporation 2. General Description: Factory assembled and tested; designed for exterior installation; consisting of compressor, indoor and outside refrigerant coils, indoor fan and outside coil fan, refrigeration and temperature controls, filters, and dampers. The units shall be dedicated downflow airflow. The operating range shall be between 115 F and 50 F in cooling as standard from the factory for all units. Cooling performance shall be rated in accordance with ARI testing procedures. All units shall be factory assembled, internally wired, fully charged with R-410A, and 100 percent run tested to check cooling operation, fan and blower rotation and control sequence, before leaving the factory. Wiring internal to the unit shall be colored and numbered for simplified identification. 3. Casing: 18 guage or heavier G90Galvanized-steel construction with polyurethane paint finish, capable of withstanding a 1000 hr salt spray with no visible signs of corrosion when tested in a salt spray atmosphere in accordance with ASTM B test procedure. The unit roof shall be cross broken and or sloped to assure drainage. Airside access door shall be fully gasketed with rain breaks. Access to compressor(s), controls, filters, blower, heat section, and other items requiring periodic checking or maintenance shall be through hinged access doors with a quarter turn latch (door fastening screws are not acceptable). Minimum 1-inch- thick 1.5 pound density neoprene coated fiberglass thick thermal insulation, knockouts for electrical and piping connections, exterior condensate drain connection, and lifting lugs. 4. Unit Top: The top cover shall be one piece, or where seams exist, double hemmed and gasket sealed to prevent water leakage. 5. Indoor Fan: Backward Inclined supply fan, forward curved exhaust fan, centrifugal, belt driven with adjustable motor sheaves, grease-lubricated ball bearings, and motor. All motors shall be thermally protected. All indoor fan motors meet the U.S. Energy Policy Act of 1992 (EPACT). 6. Outside Condenser Coil Fan: Propeller type, directly driven by permanently lubricated motor and shall have built-in thermal overload protection. 7. Refrigerant Coils: Aluminum-plate fin and seamless copper tube in steel casing with equalizing-type vertical distributor 8. Compressor(s): Two hermetic scroll compressors with integral vibration isolators, internal overcurrent and overtemperature protection, internal pressure relief. 9. Refrigeration System: 1. Compressor(s).Outside coil and fan. 2. Indoor coil and fan. 3. Thermal Expansion Valves 4. Refrigerant dryers. 5. High-pressure switches. 6. Low-pressure switches. 7. Independent refrigerant circuits. 8. Brass service valves installed in discharge and liquid lines. 9. Timed Off Control: Automatic-reset control shuts compressor off after five minutes. 10. Filters: Minimum 2-inch-thick, fiberglass, (MERV 8) cartridge filters in filter rack. 11. Heating Coil: Hot water heating coil shall be factory installed in the unit heat section. Coils shall be fabricated of seamless 5/8" diameter copper tubing that is mechanically expanded into high efficiency HI-F rippled and corrugated aluminum plate fins. All coil vents and drains shall be factory installed. 12. Outside-Air Damper: Linked damper blades, for 0 to 100 percent outside air, with fully modulating, spring-return damper motor and hood. 13. Economizer: Return- and outside-air dampers with neoprene seals, outside-air filter, and hood. 1. Damper Motor: Fully modulating spring return with adjustable minimum position. Weld County PACKAGED ROOFTOP UNITS

7 2. Control: Electronic-control system by DDC uses outside-air temperature to adjust mixing dampers. 14. Power Connection: Provide for single connection of power to unit with unit-mounted disconnect switch accessible from outside unit and control-circuit transformer with built-in circuit breaker. 15. Unit Wiring: All wiring to be color coded. Provide unit wiring diagrams in color, coordinated to match the unit wiring and markings. Diagrams shall be both point to point and ladder type. Diagrams shall also be laminated in plastic and permanently fixed to the control compartment door. Installation and maintenance manuals shall be supplied with each unit, located in a metal pocket in the control access compartment door. 16. DDC Temperature Control: Equipment manufacturer to provide terminal strip for unit component functions to facilitate field mounted DDC controls (DDC ready). Smoke Detectors: Unit shall be provided photoelectric-type detectors mounted to sense smoke in the supply and return duct. Wired to shut down the 24Volt control circuit upon activation, which shuts off the unit. Provide relay contacts to interface with the fire alarm system. A test magnet is shipped in the unit control cabinet. A centralized control shall provide anti-short cycle timing and time delay between compressors to provide a higher level of machine protection. 17. Accessories: 1. PVC condensate drain trap. 2. Dirty-filter switch. 3. Power exhaust fan centrifugal type. 4. Stainless Steel (IAQ) Drain Pan 5. Phase and Brown Out Protection 6. Unit Mounted thru the door power disconnect switch 7. Economizer Dry Bulb 0-100% with Barometric Relief 18. Roof Curbs: Roof curbs shall be constructed of galvanized steel. Curbs are to be fully gasketed between the curb top and unit bottom with the curb providing full perimeter support, cross structure support and air seal for the unit. Curb gasketing shall be furnished within the control compartment of the rooftop unit to be mounted on the curb immediately before mounting of the rooftop unit. 1. Unit shall be mounted on a factory furnished acoustical style solid bottom roof curb, fully lined with 1" of neoprene coated, fiberglass insulation and with a wood nailer strip. END OF SECTION Weld County PACKAGED ROOFTOP UNITS

8 PART 1 - GENERAL SECTION TESTING, ADJUSTING, AND BALANCING GENERAL 1.1 SECTION INCLUDES 1. This Section includes TAB to produce design objectives for the following: 1. Air Systems: a. Variable-air-volume systems. b. Verifying that automatic control devices are functioning properly at Rooftop Unit only. c. Reporting results of activities and procedures specified in this Section. 1.2 RELATED REQUIREMENTS 1.3 DEFINITIONS 1. Adjust: To regulate air patterns at the terminal equipment, such as to reduce fan speed or adjust a damper. 2. Balance: To proportion flows within the distribution system, including submains, branches, and terminals, according to indicated quantities. 3. Barrier or Boundary: Construction, either vertical or horizontal, such as walls, floors, and ceilings that are designed and constructed to restrict the movement of airflow, smoke, odors, and other pollutants. 4. Draft: A current of air, when referring to localized effect caused by one or more factors of high air velocity, low ambient temperature, or direction of airflow, whereby more heat is withdrawn from a person's skin than is normally dissipated. 5. NC: Noise criteria. 6. Procedure: An approach to and execution of a sequence of work operations to yield repeatable results. 7. RC: Room criteria. 8. Report Forms: Test data sheets for recording test data in logical order. 9. Static Head: The pressure due to the weight of the fluid above the point of measurement. In a closed system, static head is equal on both sides of the pump. 10. Suction Head: The height of fluid surface above the centerline of the pump on the suction side. 11. System Effect: A phenomenon that can create undesired or unpredicted conditions that cause reduced capacities in all or part of a system. 12. System Effect Factors: Allowances used to calculate a reduction of the performance ratings of a fan when installed under conditions different from those presented when the fan was performance tested. 13. TAB: Testing, adjusting, and balancing. 14. Terminal: A point where the controlled medium, such as fluid or energy, enters or leaves the distribution system. 15. Test: A procedure to determine quantitative performance of systems or equipment. 16. Testing, Adjusting, and Balancing (TAB) Firm: The entity responsible for performing and reporting TAB procedures. 1.4 SUBMITTALS 1. Qualification Data: Within 30 days from Contractor's Notice to Proceed, submit 3 copies of evidence that TAB firm and this Project's TAB team members meet the qualifications specified in "Quality Assurance" Article. 2. Contract Documents Examination Report: Within 30 days from Contractor's Notice to Proceed, submit 3 copies of the Contract Documents review report as specified in Part 3. Weld County TESTING, ADJUSTING, AND BALANCING

9 3. Strategies and Procedures Plan: Within 60 days from Contractor's Notice to Proceed, submit 4 copies of TAB strategies and step-by-step procedures as specified in Part 3 "Preparation" Article. Include a complete set of report forms intended for use on this Project. 4. Certified TAB Reports: Submit two copies of reports prepared, as specified in this Section, on approved forms certified by TAB firm. 5. Sample Report Forms: Submit two sets of sample TAB report forms. 6. Warranties specified in this Section. 1.5 QUALITY ASSURANCE 1. TAB Firm Qualifications: Engage a TAB firm certified by AABC. 2. Certification of TAB Reports: Certify TAB field data reports. This certification includes the following: 1. Review field data reports to validate accuracy of data and to prepare certified TAB reports. 2. Certify that TAB team complied with approved TAB plan and the procedures specified and referenced in this Specification. 3. TAB Report Forms: Use standard forms from AABC's "National Standards for Testing and Balancing Heating, Ventilating, and Air Conditioning Systems." 4. Instrumentation Type, Quantity, and Accuracy: As described in AABC's "National Standards for Testing and Balancing Heating, Ventilating, and Air Conditioning Systems." 5. Instrumentation Calibration: Calibrate instruments at least every six months or more frequently if required by instrument manufacturer. 1. Keep an updated record of instrument calibration that indicates date of calibration and the name of party performing instrument calibration. 1.6 PROJECT CONDITIONS 1. Partial Owner Occupancy: Owner may occupy completed areas of building before Substantial Completion. Cooperate with Owner during TAB operations to minimize conflicts with Owner's operations. 1.7 COORDINATION 1. Coordinate the efforts of factory-authorized service representatives for systems and equipment, HVAC controls installers, and other mechanics to operate HVAC systems and equipment to support and assist TAB activities. 2. Notice: Provide a minimum of seven days' advance notice for each test. Include scheduled test dates and times. Coordinate with facilities maintenance staff to avoid interfering with building operations. 3. Perform TAB after leakage and pressure tests on air and water distribution systems have been satisfactorily completed. PART 2 - PRODUCTS 2.01 (NOT APPLICABLE) PART 3 - EXECUTION 3.1 EXAMINATION 1. Examine approved submittal data of HVAC systems and equipment. 2. Examine equipment performance data including fan and pump curves. 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. Calculate system effect factors to reduce performance ratings of HVAC equipment when installed under conditions different from those presented when the equipment was performance tested at the factory. To calculate system effects for air systems, use tables and charts found in AMCA 201, "Fans and Systems," Sections 7 through 10; or in SMACNA's "HVAC Systems--Duct Design," Sections 5 and 6. Compare this data with the design data and installed conditions. Weld County TESTING, ADJUSTING, AND BALANCING

10 3. Examine system and equipment installations to verify that they are complete and that testing, cleaning, adjusting, and commissioning specified in individual Sections have been performed. 4. Examine system and equipment test reports. 5. Examine systems for functional deficiencies that cannot be corrected by adjusting and balancing. 6. Examine HVAC equipment to ensure that clean filters have been installed, bearings are greased, belts are aligned and tight, and equipment with functioning controls is ready for operation. 7. Examine heat-transfer coils for correct piping connections and for clean and straight fins. 8. Examine automatic temperature system components to verify the following: 1. Dampers, and other controlled devices are operated by the intended controller. 2. Dampers are in the position indicated by the controller. 3. Sequence of operation for control modes is according to the Contract Documents. 4. Interlocked systems are operating. 5. Changeover from heating to cooling mode occurs according to indicated values. 9. Report deficiencies discovered before and during performance of TAB procedures. Observe and record system reactions to changes in conditions. Record default set points if different from indicated values. 3.2 PREPARATION 1. Prepare a TAB plan that includes strategies and step-by-step procedures. 2. Complete system readiness checks and prepare system readiness reports. Verify the following: 1. Permanent electrical power wiring is complete. 2. Hydronic systems are filled, clean, and free of air. 3. Automatic temperature-control systems are operational. 4. Equipment and duct access doors are securely closed. 5. Balance, smoke, and fire dampers are open. 6. Isolating and balancing valves are open and control valves are operational. 7. Ceilings are installed in critical areas where air-pattern adjustments are required and access to balancing devices is provided. 8. Windows and doors can be closed so indicated conditions for system operations can be met. 3.3 GENERAL PROCEDURES FOR TESTING AND BALANCING 1. Perform testing and balancing procedures on each system according to the procedures contained in AABC's "National Standards for Testing and Balancing Heating, Ventilating, and Air Conditioning Systems" and this Section. 2. Mark equipment and balancing device settings with paint or other suitable, permanent identification material, including damper-control positions, valve position indicators, fan-speed-control levers, and similar controls and devices, to show final settings. 3. Take and report testing and balancing measurements in inch-pound (IP) units. 3.4 GENERAL PROCEDURES FOR BALANCING AIR SYSTEMS 1. Prepare test reports for both fans and outlets. Obtain manufacturer's outlet factors and recommended testing procedures. Crosscheck the summation of required outlet volumes with required fan volumes. 2. Check airflow patterns from the outside-air louvers and dampers and the return- and exhaust-air dampers, through the supply-fan discharge and mixing dampers. 3. Locate start-stop and disconnect switches, electrical interlocks, and motor starters. 4. Verify that motor starters are equipped with properly sized thermal protection. 5. Check dampers for proper position to achieve desired airflow path. 6. Check for airflow blockages. Weld County TESTING, ADJUSTING, AND BALANCING

11 7. Check condensate drains for proper connections and functioning. 8. Check for proper sealing of air-handling unit components PROCEDURES FOR MOTORS 1. Motors, 1/2 HP and Larger: Test at final balanced conditions and record the following data: 1. Manufacturer, model, and serial numbers. 2. Motor horsepower rating. 3. Motor rpm. 4. Efficiency rating. 5. Nameplate and measured voltage, each phase. 6. Nameplate and measured amperage, each phase. 7. Starter thermal-protection-element rating. 3.5 PROCEDURES FOR HEAT-TRANSFER COILS 1. Refrigerant Coils: Measure the following data for each coil: 1. Dry-bulb temperature of entering and leaving air. 2. Wet-bulb temperature of entering and leaving air. 3. Airflow. 4. Air pressure drop. 5. Refrigerant suction pressure and temperature. 3.6 PROCEDURES FOR TEMPERATURE MEASUREMENTS 1. During TAB, report the need for adjustment in temperature regulation within the automatic temperature-control system. 2. Measure indoor and outside-air, wet- and dry-bulb temperatures when the building or zone is occupied. Provide a record log of measurements in startup report. 3.7 PROCEDURES FOR SPACE PRESSURIZATION MEASUREMENTS AND ADJUSTMENTS 1. Before testing for space pressurization, observe the space to verify the integrity of the space boundaries. Verify that windows and doors are closed and applicable safing, gaskets, and sealants are installed. Report deficiencies and postpone testing until after the reported deficiencies are corrected. 2. Measure, adjust, and record the pressurization of each room, each zone, and each building by adjusting the supply, return, and exhaust airflows to achieve the indicated conditions. 3. Measure space pressure differential where pressure is used as the design criteria, and measure airflow differential where differential airflow is used as the design criteria for space pressurization. 1. For pressure measurements, measure and record the pressure difference between the intended spaces at the door with all doors in the space closed. Record the high-pressure side, low-pressure side, and pressure difference between each adjacent space. 2. For applications with cascading levels of space pressurization, begin in the most critical space and work to the least critical space. 3. Test room pressurization first, then zones, and finish with building pressurization. 4. To achieve indicated pressurization, set the supply airflow to the indicated conditions and adjust the exhaust and return airflow to achieve the indicated pressure or airflow difference. 5. For spaces with pressurization being monitored and controlled automatically, observe and adjust the controls to achieve the desired set point. 1. Compare the values of the measurements taken to the measured values of the control system instruments and report findings. 2. Check the repeatability of the controls by successive tests designed to temporarily alter the ability to achieve space pressurization. Test overpressurization and underpressurization, and observe and report on the system's ability to revert to the set point. 3. For spaces served by variable-air-volume supply and exhaust systems, measure space pressurization at indicated airflow and minimum airflow conditions. 6. In spaces that employ multiple modes of operation, such as normal mode and emergency mode Weld County TESTING, ADJUSTING, AND BALANCING

12 or occupied mode and unoccupied mode, measure, adjust, and record data for each operating mode. 7. Record indicated conditions and corresponding initial and final measurements. Report deficiencies. 3.8 TEMPERATURE-CONTROL VERIFICATION 1. Verify that controllers are calibrated and commissioned. 2. Check transmitter and controller locations and note conditions that would adversely affect control functions. 3. Record controller settings and note variances between set points and actual measurements. 4. Check the operation of limiting controllers (i.e., high- and low-temperature controllers). 5. Check free travel and proper operation of control devices such as damper and valve operators. 6. Check the sequence of operation of control devices. Note air pressures and device positions and correlate with airflow and water flow measurements. Note the speed of response to input changes. 7. Check the interaction of interlock and lockout systems. 8. Check main control supply-air pressure and observe compressor and dryer operations. 9. Record voltages of power supply and controller output. Determine whether the system operates on a grounded or nongrounded power supply. 10. Note operation of electric actuators using spring return for proper fail-safe operations. 3.9 TOLERANCES 1. Set HVAC system airflow and water flow rates within the following tolerances: 1. Supply, Return, and Exhaust Fans and Equipment with Fans: Plus 5 to plus 10 percent FINAL REPORT 1. General: Typewritten, or computer printout in letter-quality font, on standard bond paper, in three-ring binder, tabulated and divided into sections by tested and balanced systems. 2. Include a certification sheet in front of binder signed and sealed by the certified testing and balancing engineer. 1. Include a list of instruments used for procedures, along with proof of calibration. 3. Final Report Contents: In addition to certified field report data, include the following: 1. Fan curves. 2. Manufacturers' test data. 3. Field test reports prepared by system and equipment installers. 4. Other information relative to equipment performance, but do not include Shop Drawings and Product Data. 4. General Report Data: In addition to form titles and entries, include the following data in the final report, as applicable: Weld County TESTING, ADJUSTING, AND BALANCING

13 1. Title page. 2. Name and address of TAB firm. 3. Project name. 4. Project location. 5. Architect's name and address. 6. Engineer's name and address. 7. Contractor's name and address. 8. Report date. 9. Signature of TAB firm who certifies the report. 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. d. Nomenclature sheets for each item of equipment. g. Test conditions for fan performance forms including the following: 1) Settings for outside-, return-, and exhaust-air dampers. 2) Conditions of filters. 3) Cooling coil, wet- and dry-bulb conditions. 4) Face and bypass damper settings at coils. 5) Fan drive settings including settings and percentage of maximum pitch diameter. 6) Inlet vane settings for variable-air-volume systems. 7) Settings for supply-air, static-pressure controller. 8) Other system operating conditions that affect performance. 5. Air-Handling Unit Test Reports: For air-handling units with coils, include the following: 1. Unit Data: Include the following: a. Unit identification. b. Location. c. Make and type. d. Model number and unit size. e. Manufacturer's serial number. f. Unit arrangement and class. g. Discharge arrangement. h. Sheave make, size in inches, and bore. i. Sheave dimensions, center-to-center, and amount of adjustments in inches. j. Number of belts, make, and size. k. Number of filters, type, and size. l. Motor Data: 1) Make and frame type and size. 2) Horsepower and rpm. 3) Volts, phase, and hertz. 4) Full-load amperage and service factor. 5) Sheave make, size in inches, and bore. 6) Sheave dimensions, center-to-center, and amount of adjustments in inches. m. Test Data (Indicated and Actual Values): 1) Total airflow rate in cfm. 2) Total system static pressure in inches wg. 3) Fan rpm. 4) Discharge static pressure in inches wg. 5) Filter static-pressure differential in inches wg. 6) Cooling coil static-pressure differential in inches wg. 7) Outside airflow in cfm. 8) Return airflow in cfm. 9) Outside-air damper position. Weld County TESTING, ADJUSTING, AND BALANCING

14 10) Return-air damper position. END OF SECTION Weld County TESTING, ADJUSTING, AND BALANCING