WINDSOR FOREST HIGH SCHOOL HVAC REPLACEMENT ADDENDUM #1 SAVANNAH CHATHAM COUNTY PUBLIC SCHOOL SYSTEM FEBRUARY 12, 2016

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1 SECTION ACOUSTICAL PANEL PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Requirements and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. Section includes acoustical panels and exposed suspension systems for interior ceilings to match existing. B. Products furnished, but not installed under this Section, include anchors, clips, and other ceiling attachment devices to be cast in concrete. 1.3 PREINSTALLATION MEETINGS A. Preinstallation Conference: Conduct conference at Project site. 1.4 ACTION SUBMITTALS A. Product Data: For each type of product. B. Samples for Verification: For each component and for each exposed finish prepared on Samples of sizes indicated below: 1. Acoustical Panels: Set of 6-inch- square Samples of each type, color, pattern, and texture. 2. Exposed Suspension-System Members, Moldings, and Trim: Set of 6-inch-long Samples of each type, finish, and color. 3. Clips: Full-size seismic clips. C. Include design calculations for seismic restraints for Seismic zone C, including analysis data signed and sealed by the qualified professional engineer responsible for their preparation. 1.5 INFORMATIONAL SUBMITTALS A. Coordination Drawings: Reflected ceiling plans, drawn to scale, on which the following items are shown and coordinated with each other, using input from installers of the items involved: 1. Ceiling suspension-system members. 2. Structural members to which suspension systems will be attached. 3. Size and location of initial access modules for acoustical panels. ACOUSTICAL PANEL CEILINGS SCCPSS BID #C16-33 (ESPLOST)

2 4. Items penetrating finished ceiling and ceiling-mounted items including the following: a. Lighting fixtures. b. Diffusers. c. Grilles. d. Speakers. e. Sprinklers. f. Access panels. g. Perimeter moldings. 5. Minimum Drawing Scale: 1/8 inch = 1 foot. B. Qualification Data: For testing agency. C. Product Test Reports: For each acoustical panel ceiling, for tests performed by a qualified testing agency. D. Evaluation Reports: For each acoustical panel ceiling suspension system and anchor and fastener type, from ICC-ES. E. Field quality-control reports. 1.6 CLOSEOUT SUBMITTALS A. Maintenance Data: For finishes to include in maintenance manuals. 1.7 MAINTENANCE MATERIAL SUBMITTALS A. Furnish extra materials, from the same product run, that match products installed and that are packaged with protective covering for storage and identified with labels describing contents. 1. Acoustical Ceiling Units: Full-size panels equal to 2 percent of quantity installed. 2. Suspension-System Components: Quantity of each exposed component equal to 2 percent of quantity installed. 1.8 DELIVERY, STORAGE, AND HANDLING A. Deliver acoustical panels, suspension-system components, and accessories to Project site and store them in a fully enclosed, conditioned space where they will be protected against damage from moisture, humidity, temperature extremes, direct sunlight, surface contamination, and other causes. B. Before installing acoustical panels, permit them to reach room temperature and stabilized moisture content. 1.9 FIELD CONDITIONS A. Environmental Limitations: Do not install acoustical panel ceilings until spaces are enclosed and weathertight, wet-work in spaces is complete and dry, work above ceilings is complete, and ambient temperature and humidity conditions are maintained at the levels indicated for Project when occupied for its intended use. ACOUSTICAL PANEL CEILINGS SCCPSS BID #C16-33 (ESPLOST)

3 PART 2 - PRODUCTS 2.1 MANUFACTURERS A. Source Limitations: Obtain each type of acoustical ceiling panel and its supporting suspension system from single source from single manufacturer. Match existing panels. Verify prior to installation that the specified panel will match existing. 2.2 PERFORMANCE REQUIREMENTS A. Seismic Performance: Suspended ceilings shall withstand the effects of earthquake motions determined according to ASCE/SEI 7for Seismic Zone C. B. Surface-Burning Characteristics: Comply with ASTM E 84; testing by a qualified testing agency. Identify products with appropriate markings of applicable testing agency. 1. Flame-Spread Index: Class A according to ASTM E Smoke-Developed Index: 450 or less. C. Fire-Resistance Ratings: Comply with ASTM E 119; testing by a qualified testing agency. Identify products with appropriate markings of applicable testing agency. 2.3 ACOUSTICAL PANELS (APC) A. Basis-of-Design Product: Subject to compliance with requirements, provide Armstrong World Industries, Inc.; FINE FISSURED 1728 or a comparable product by one of the following: 1. CertainTeed Corporation; School Board FFSB-# United States Gypsum Company; Astro. B. Acoustical Panel Standard: Provide manufacturer's standard panels according to ASTM E 1264 and designated by type, form, pattern, acoustical rating, and light reflectance unless otherwise indicated. C. Classification: Provide fire-resistance-rated panels as follows: 1. Type and Form: Type III, mineral base with painted finish; Form 2, water felted. 2. Pattern: CE (perforated, small holes and lightly textured). D. Color: White. E. Light Reflectance (LR): Not less than F. Ceiling Attenuation Class (CAC): Not less than 30. G. Noise Reduction Coefficient (NRC): Not less than H. Edge/Joint Detail: Square. I. Thickness: 5/8 inch. ACOUSTICAL PANEL CEILINGS SCCPSS BID #C16-33 (ESPLOST)

4 J. Modular Size: 24 by 24 inches. K. Antimicrobial Treatment: Manufacturer's standard broad spectrum, antimicrobial formulation that inhibits fungus, mold, mildew, and gram-positive and gram-negative bacteria and showing no mold, mildew, or bacterial growth when tested according to ASTM D 3273, ASTM D 3274, or ASTM G 21 and evaluated according to ASTM D 3274 or ASTM G METAL SUSPENSION SYSTEM A. Basis-of-Design Product: Subject to compliance with requirements, provide Prelude 15/16 by Armstrong World Industries, Inc; or a comparable product by one of the following: 1. CertainTeed Corporation. 2. United States Gypsum Company. B. Metal Suspension-System Standard: Provide manufacturer's standard, direct-hung, metal suspension system and accessories according to ASTM C 635/C 635M and designated by type, structural classification, and finish indicated. C. Wide-Face, Capped, Double-Web, Steel Suspension System: Main and cross runners roll formed from cold-rolled steel sheet; prepainted, electrolytically zinc coated, or hot-dip galvanized, G30 coating designation; with prefinished 15/16-inch- wide metal caps on flanges. 1. Structural Classification: Intermediate-duty system. 2. End Condition of Cross Runners: Override (stepped) type. 3. Face Design: Flat, flush. 4. Cap Material: Cold-rolled steel. 5. Cap Finish: Painted white. 2.5 ACCESSORIES A. Attachment Devices: Size for five times the design load indicated in ASTM C 635/C 635M, Table 1, "Direct Hung," unless otherwise indicated. Comply with seismic design requirements. 1. Anchors in Concrete: Anchors of type and material indicated below, with holes or loops for attaching hangers of type indicated and with capability to sustain, without failure, a load equal to five times that imposed by ceiling construction, as determined by testing according to ASTM E 488/E 488M or ASTM E 1512 as applicable, conducted by a qualified testing and inspecting agency. a. Type: Postinstalled expansion anchors. b. Corrosion Protection: Carbon-steel components zinc plated according to ASTM B 633, Class SC 1 (mild) service condition. c. Corrosion Protection: Stainless-steel components complying with ASTM F 593 and ASTM F 594, Group 1 Alloy 304 or 316. d. Corrosion Protection: Components fabricated from nickel-copper-alloy rods complying with ASTM B 164 for UNS No. N04400 alloy. ACOUSTICAL PANEL CEILINGS SCCPSS BID #C16-33 (ESPLOST)

5 2. Power-Actuated Fasteners in Concrete: Fastener system of type suitable for application indicated, fabricated from corrosion-resistant materials, with clips or other accessory devices for attaching hangers of type indicated and with capability to sustain, without failure, a load equal to 10 times that imposed by ceiling construction, as determined by testing according to ASTM E 1190, conducted by a qualified testing and inspecting agency. B. Wire Hangers, Braces, and Ties: Provide wires as follows: 1. Zinc-Coated, Carbon-Steel Wire: ASTM A 641/A 641M, Class 1 zinc coating, soft temper. 2. Stainless-Steel Wire: ASTM A 580/A 580M, Type 304, nonmagnetic. 3. Nickel-Copper-Alloy Wire: ASTM B 164, nickel-copper-alloy UNS No. N Size: Wire diameter sufficient for its stress at three times hanger design load (ASTM C 635/C 635M, Table 1, "Direct Hung") will be less than yield stress of wire, but not less than inch- diameter wire. C. Seismic Clips: Manufacturer's standard seismic clips designed to secure acoustical panels in place during a seismic event. 2.6 METAL EDGE MOLDINGS A. Basis-of-Design Product: Subject to compliance with requirements, provide Armstrong World Industries, Inc; or a comparable product by one of the following: 1. CertainTeed Corporation. 2. United States Gypsum Company. B. Extruded-Aluminum Edge Moldings and Trim: Where indicated, provide manufacturer's extruded-aluminum edge moldings and trim of profile indicated or referenced by manufacturer's designations, including splice plates, corner pieces, and attachment and other clips, complying with seismic design requirements. C. Baked-Enamel or Powder-Coat Finish: Minimum dry film thickness of 1.5 mils. Comply with ASTM C 635/C 635M and coating manufacturer's written instructions for cleaning, conversion coating, and applying and baking finish. PART 3 - EXECUTION 3.1 EXAMINATION A. Examine substrates, areas, and conditions, including structural framing to which acoustical panel ceilings attach or abut, with Installer present, for compliance with requirements specified in this and other Sections that affect ceiling installation and anchorage and with requirements for installation tolerances and other conditions affecting performance of acoustical panel ceilings. B. Examine acoustical panels before installation. Reject acoustical panels that are wet, moisture damaged, or mold damaged. C. Proceed with installation only after unsatisfactory conditions have been corrected. ACOUSTICAL PANEL CEILINGS SCCPSS BID #C16-33 (ESPLOST)

6 3.2 PREPARATION A. Measure each ceiling area and establish layout of acoustical panels to balance border widths at opposite edges of each ceiling. Avoid using less-than-half-width panels at borders unless otherwise indicated, and comply with layout shown on reflected ceiling plans. B. Layout openings for penetrations centered on the penetrating items. 3.3 INSTALLATION A. Install acoustical panel ceilings according to ASTM C 636/C 636M, seismic design requirements, and manufacturer's written instructions. 1. Fire-Rated Assembly: Install fire-rated ceiling systems according to tested fire-rated design. B. Suspend ceiling hangers from building's structural members and as follows: 1. Install hangers plumb and free from contact with insulation or other objects within ceiling plenum that are not part of supporting structure or of ceiling suspension system. 2. Splay hangers only where required and, if permitted with fire-resistance-rated ceilings, to miss obstructions; offset resulting horizontal forces by bracing, countersplaying, or other equally effective means. 3. Where width of ducts and other construction within ceiling plenum produces hanger spacings that interfere with location of hangers at spacings required to support standard suspension-system members, install supplemental suspension members and hangers in form of trapezes or equivalent devices. 4. Secure wire hangers to ceiling-suspension members and to supports above with a minimum of three tight turns. Connect hangers directly to structure or to inserts, eye screws, or other devices that are secure and appropriate for substrate and that will not deteriorate or otherwise fail due to age, corrosion, or elevated temperatures. 5. Do not support ceilings directly from permanent metal forms or floor deck. Fasten hangers to cast-in-place hanger inserts, postinstalled mechanical or adhesive anchors, or power-actuated fasteners that extend through forms into concrete. 6. When steel framing does not permit installation of hanger wires at spacing required, install carrying channels or other supplemental support for attachment of hanger wires. 7. Do not attach hangers to steel deck tabs. 8. Do not attach hangers to steel roof deck. Attach hangers to structural members. 9. Space hangers not more than 48 inches o.c. along each member supported directly from hangers unless otherwise indicated; provide hangers not more than 8 inches from ends of each member. 10. Size supplemental suspension members and hangers to support ceiling loads within performance limits established by referenced standards. C. Install edge moldings and trim of type indicated at perimeter of acoustical ceiling area and where necessary to conceal edges of acoustical panels. 1. Screw attach moldings to substrate at intervals not more than 16 inches o.c. and not more than 3 inches from ends. Miter corners accurately and connect securely. 2. Do not use exposed fasteners, including pop rivets, on moldings and trim. D. Install suspension-system runners so they are square and securely interlocked with one another. Remove and replace dented, bent, or kinked members. ACOUSTICAL PANEL CEILINGS SCCPSS BID #C16-33 (ESPLOST)

7 E. Install acoustical panels with undamaged edges and fit accurately into suspension-system runners and edge moldings. Scribe and cut panels at borders and penetrations to provide precise fit. 1. For square-edged panels, install panels with edges fully hidden from view by flanges of suspension-system runners and moldings. 2. Install seismic clips in areas indicated; space according to panel manufacturer's written instructions unless otherwise indicated. 3. Protect lighting fixtures and air ducts according to requirements indicated for fireresistance-rated assembly. 3.4 ERECTION TOLERANCES A. Suspended Ceilings: Install main and cross runners level to a tolerance of 1/8 inch in 12 feet, non-cumulative. B. Moldings and Trim: Install moldings and trim to substrate and level with ceiling suspension system to a tolerance of 1/8 inch in 12 feet, non-cumulative. 3.5 CLEANING A. Clean exposed surfaces of acoustical panel ceilings, including trim, edge moldings, and suspension-system members. Comply with manufacturer's written instructions for cleaning and touchup of minor finish damage. B. Remove and replace ceiling components that cannot be successfully cleaned and repaired to permanently eliminate evidence of damage. END OF SECTION ACOUSTICAL PANEL CEILINGS SCCPSS BID #C16-33 (ESPLOST)

8 SECTION ENERGY RECOVERY VENTILATORS PART 1 - GENERAL 1.01 RELATED DOCUMENTS: A. Drawings and general provisions of the Contract, including General and Special Conditions and Division 1 Specification Sections, apply to this Section DESCRIPTION: A. The ventilators shall be 100% outdoor air units designed to provide a continuous supply of conditioned, filtered ventilation air QUALITY ASSURANCE: A. Valent is the Basis of Design manufacturer for Heat Pump Ventilators. Equivalent equipment by Aaon, or iaire that meets performance, capacity, space and other requirements of the design documents shall be acceptable. B. Industry Standards: 1. Comply with applicable provisions of NFPA 90A pertaining to construction and installation of air conditioning units. 2. Comply with applicable provisions of UL465, and provide UL labels for electrical components. 3. Comply with installation requirements of ANSI/ASHRAE 15; Safety Code for Mechanical Refrigeration. 4. Extended Warranty: In addition to the standard one-year warranty on all components, compressors shall bear an additional four-year manufacturer's warranty against material and design defects SUBMITTALS: A. Provide manufacturer's data, test reports, and product warranties as applicable. PART 2 - PRODUCTS 2.01 SINGLE PACKAGE UNITS: A. Units shall be single packaged type air conditioning units specifically engineered and designed for 100% outdoor air conditioning. The unit shall use DX heat pump with modulating hot gas reheat, auxiliary electric heat and energy recovery to deliver conditioned, dehumidified and filtered ventilation air. The units shall be completely factory assembled, piped, fully charged, wired for single point power supply, and tested. All controls shall be ENERGY RECOVERY VENTILATORS SCCPSS BID #C16-33 (ESPLOST)

9 factory installed and preset to the design conditions, ready for start-up. B. Cabinet: The cabinet shall be constructed of 14-gauge satin coated sheet metal with a 10- gauge base. Hinged access doors shall be 2 inch double wall construction with flush mounted cam latch mechanisms, safety door holders and raised compression gaskets. The inner wall shall be minimum 22-gauge galvanized steel. The roof assembly shall also be weatherproof double wall construction. Cabinet finish shall be the manufacturer s standard. Insulation shall be minimum 1 inch thick fiberglass board suitable for 250 F operating temperature and 5000 fpm air velocity. The surface shall be protected with a reinforcing mesh. The unit shall have a built-in hinged door electrical control panel in a separate compartment from the airstream. The enclosure shall be rated NEMA 4. The unit shall have a built-in filter rack with a separate hinged access door. The outdoor air inlet shall have an extruded aluminum storm-proof louver with 45 degree blades and ½ inch bird screen. C. Coils: Evaporator coils, hot gas reheat coils and condenser coils shall be ½ inch seamless copper tubes mechanically expanded with aluminum fins, 16 gauge galvanized steel casing and end plates with plated hardware. Coils shall be factory leak tested at minimum 400 psig air pressure in a water bath. Evaporator coils shall be minimum six rows deep with maximum air velocity of 500 fpm. Provide a sloped, self-draining IAQ drain pan under the entire evaporator coil. The pan shall be 20-gauge stainless steel. Hot gas reheat coils shall be factory-installed. Condenser coils shall receive a factory-applied corrosion protection coating. D. Refrigerant System: Compressors shall be the digital scroll type, suction gas cooled, suitable for HFC refrigerant, equipped with internal thermal protection, service valves and resilient type external mounting. The refrigerant circuit shall have an in-line solder type liquid line filter drier, liquid and moisture indicator, hot gas bypass, suction accumulator, receiver with pressure relief valve set at 400 psig and a thermostatic expansion valve. Tamper-proof, hermetically sealed, non-adjustable high and low pressure controls and service valves shall be installed using Schraeder type valves. Factory charge with HFC refrigerant. E. Condenser Fan Section: Condenser fans shall be of the direct-driven propeller type, mounted for vertical air discharge. The motor shall be inherently protected permanently lubricated with sealed ball bearings and built-in overload protection. Condenser coil guard shall be heavy gauge welded steel with baked-on epoxy coating. F. Evaporator Fan Section: The evaporator supply fan shall be forward curved or plenum beltdriven type DWDI mounted on a solid steel shaft supported by sealed ball bearings. Fan drive shall be belt driven type with adjustable speed motor pulley. Fan shall be statically and dynamically balanced and tested. Provide grease-lubricated, self aligning ball bearings with 200,000 hours average life. The motor shall be an open drip-proof, induction type with class B insulation and adjustable base. G. Filters: Return air filters shall be the pleated type, minimum MERV 7. Provide an aluminum channel frame with drain holes. Velocity shall not exceed 500 fpm. H. Electric Resistance Heater: Unit shall be equipped with a factory mounted and wired auxiliary electric heating coil with capacity as scheduled. Heating elements shall be the nickel-chromium resistance wire type supported on ceramic bushings. Power wiring for coil is to be integral to the unit for a single point power connection. Provide airflow switches, contactors and fusing (as required). Built-in controls shall be supplied with the heater as integral and pre-wired components, contactors, fused control transformer, pressure ENERGY RECOVERY VENTILATORS SCCPSS BID #C16-33 (ESPLOST)

10 differential switch, power supply terminals, thermal overheat protection, and solid state current modulating control (SCR). I. Energy Recovery Section: The unit shall have a factory mounted and tested energy recovery wheel mounted in a rigid frame containing the wheel drive motor, drive belt, wheel seals and bearings. The wheel shall be rated in accordance with ARI 1060 and shall bear the ARI certification symbol. The wheel shall be constructed of light weight polymer material with permanently bonded desiccant coating. Wheel media shall be cleanable using hot water or light detergent without degrading the efficiency. The exhaust fan shall be the backward inclined type. Fan and motor shall be dynamically balanced. Include a backdraft damper and 4 inch thick, pleated, disposable outside air filters. J. Makeup Air Damper: Provide a factory-installed, parallel blade, two-position motorized damper. The damper shall be fully open when the unit fan is running and completely closed when the unit fan is off. K. Controls: The control panel shall be built-in within a separate compartment not in the supply airstream. Fan motors and compressor motors shall be controlled by contactors and shall be protected with solid state adjustable trip overloads. Provide a low enthalpy cut-out, auxiliary heating control interlock, condenser fan motor low ambient control, and built-in cool/reheat outdoor air thermostat. An auto-reset voltage monitor shall be provided to shut down electrical system in response to temporary voltage fluctuation or phase loss. Provide a power block terminal and dry contacts for alarm and fan interlock. Connections shall be provided for remote on/off control. All wires shall be in a wire duct. Compressors shall have a time delay relay to prevent short-cycling. L. See Section for control information. All controls shall be full DDC furnished and installed under section PART 3 - EXECUTION 3.01 INSPECTION: A. Installer must examine areas and conditions under which units are to be installed and notify the Contractor in writing of conditions detrimental to the proper completion of the work. Do not proceed with the work until the unsatisfactory conditions have been corrected in a manner acceptable to Installer INSTALLATION: A. Install units where shown, in accordance with equipment manufacturer's written instructions and recognized industry practices, to insure that units comply with requirements and serve intended purposes. B. Coordinate with other work, including structural, ductwork, piping and electrical work as necessary to interface installation of ventilation units with other work. Control wiring, conduit and devices for complete, operable systems shall be provided and installed under the Mechanical specifications. ENERGY RECOVERY VENTILATORS SCCPSS BID #C16-33 (ESPLOST)

11 3.03 TESTING: A. Upon completion of installation and connection to the completed air distribution system, start-up and test equipment in accordance with the manufacturer's recommendations. Operate units to demonstrate capability and compliance with requirements. Where possible, fieldcorrect malfunctioning units, then retest to demonstrate compliance. END OF SECTION ENERGY RECOVERY VENTILATORS SCCPSS BID #C16-33 (ESPLOST)