SECTION AIR COILS

Transcription

1 PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Specification Sections, apply to this Section. B. Related Sections: The following Sections contain requirements that relate to this Section: 1. Section "HVAC Instrumentation and Controls" for air coil, temperaturecontrol valve requirements. 1.2 SUMMARY A. This Section includes the following: 1. Integral face and bypass heating coils. 2. Chilled water cooling coils. 3. Direct expansion cooling coils. 4. Refrigerant condenser coil. 5. Hot (glycol) water coils. 6. Hot glycol coils. 7. Hot water reheat coils. 8. Heat recovery coils. 9. Electric duct heaters. 1.3 SUBMITTALS A. General: Submit each item in this Article according to the Conditions of the Contract and Specification Sections. B. No equipment shall be fabricated or delivered until receipt of approved shop drawings from the Architect. C. Prior to submittal, the equipment supplier shall coordinate with the Contractor to determine the quantity and arrangement of each type of equipment device provided for this project. Equipment furnished with improper arrangement shall be replaced by the Contractor at no additional cost to the Owner. D. Provide the following information with each shop drawing submission. 1. Complete specification of the equipment which will be provided including all optional equipment. All equipment shall be tagged. Refer to "Mechanical Identification" Section for further requirements. 2. Submittal data may include unpriced factory order forms indicating manufacturer's model number, cabinet type, materials of construction and what optional equipment will be furnished along with catalog information explaining the model number, standard features, and optional features. 3. Commodity items with fixed performance characteristics such as unit heaters, convectors, fan coil units, unit ventilators and reheat coils shall be listed Page 1 of 9

2 individually indicating performance equal to or superior to the standard product scheduled using identical air and water flow rates for each standard size. Generally, supply air temperatures and supply water temperatures will be considered fixed. It is optional for the manufacturer to submit a complete list of items which will be delivered. If submitted, tag numbers must correspond to the room numbers shown on the Architectural Drawings which the item will service. 4. Provide computerized selection data for each coil and heat exchanger provided. Data shall disclose all coil selection conditions including altitude. 5. Provide color charts for exposed equipment color selection. 6. Submittal data showing that all coils and terminal equipment bear the ARI Certified Performance Seal for performance at the capacities specified on the Drawings. 7. Arrangement drawings including physical dimensions, support locations, and weight of each terminal device, and the locations of access doors, pipe connections, and "left hand unit and right hand units". 8. Installation, operation and maintenance instructions in shop manual format including spare parts list. 1.4 QUALITY CONTROL A. Manufacturer Qualifications: Firm experienced in manufacturing air coils and duct heaters similar to those indicated for this Project and that have a record of successful inservice performance. B. All coils shall be rated in accordance with ARI Standard 410 and shall comply with the ARI Certified Ratings Program. C. Refrigerant coils shall meet the requirements of the latest edition of ASHRAE Standard 15. D. Comply with NFPA 70 "National Electrical Code" for components and installation. E. Listing and Labeling: Provide products specified in this Section that are listed and labeled. 1. The Terms "Listed" and "Labeled": As defined in the National Electrical Code, Article Listing and Labeling Agency Qualifications: A "Nationally Recognized Testing Laboratory" (NRTL) as defined in OSHA Regulation F. Single-Source Responsibility: Obtain air coil components from one source and by a single manufacturer. 1.5 COORDINATION A. Coordinate layout and installation of air coils with duct, insulation, and with other installations. Revise locations and elevations from those indicated as required to suit field conditions, and as approved by the Architect. PART 2 - PRODUCTS Page 2 of 9

3 2.1 MANUFACTURERS A. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated in the Work include, but are not limited to, the following: B. Manufacturers: Subject to compliance with requirements, provide products by one of the following: 1. Integral Face and Bypass Heating Coils: a. Aerofin b. Marlo c. Wing 2. Chilled Water Cooling Coils: 3. Direct Expansion Cooling Coils: 4. Refrigerant Condenser Coils: 5. Hot (Glycol) Water Coils and Hot Glycol Coils: Page 3 of 9

4 6. Hot Water Reheat Coils: a. Carrier Corporation b. McQuay c. Trane d. York 7. Heat Recovery Coils: 8. Electric Duct Heaters a. Q-Mark 2.2 TYPE "VIFB" OR "HIFB" INTEGRAL FACE AND BYPASS HEATING COILS A. Provide integral face and bypass heating coils of the size, type, and capacity as shown and scheduled on the Drawings. Type VIFB coils shall have a vertical steam path; Type HIFB coils shall have a horizontal steam path. B. Each heating coil shall consist of a built-in series of finned heating elements and bypasses with interlocked dampers modulated by a damper motor. 1. Dampers shall be 16-gauge roll-formed cold-rolled steel with baked enamel finish. Damper motors shall be pneumatic type suitable for 3-15 psig modulating air signal and 18 to 20 psig main air motors shall be provided by the coil manufacturer and shall be similar to those specified for dampers in Section 15900/ Dampers shall fail to the full heating position when a 0 psig signal or 0 psig main air is applied. Motors shall be complete with pilot positioners. 2. Casing shall be 14-gauge steel, galvanized and painted, with rigid framework including structural steel pipe supports in all four corners on both entering and leaving air side. 3. Vertical (and/or horizontal) finned heating elements shall be fabricated of seamless copper tubes with aluminum fins spaced not closer than 10 fins per inch. Each tube shall be individually secured to the steam and return headers by a brazed joint with provision for individual tube expansion and contraction. Finned elements shall be suitable for 100 psig saturated steam and 330 deg. F temperature and shall be factory tested at 200 psig steam and with air pressure under water (hydrostatically) at 400 psig. Page 4 of 9

5 C. Dampers shall be arranged so as to completely enclose and isolate the heating coil passes when no heating is required. Each coil shall be capable of maintaining a constant discharge air temperature regardless of variations in entering air temperature with full steam pressure (or with full hot water flow). 1. Proportioning of the air shall be such that the temperature at any point in a plane parallel to the face of the coil three feet downstream form the leaving side will not vary more than 5 deg. F from the average discharge airstream temperature. Pressure drop of air passing through the coil shall not vary more than plus or minus 5 percent, regardless of the position of the internal dampers. D. The coil shop drawing submittal shall include data on all the coils and on the damper motors. The data shall be broken down for each application or installation. 2.3 CHILLED WATER COOLING COILS A. Provide chilled water cooling coils of the capacity and size as scheduled on the Drawings. Coil ratings shall be certified in accordance with ARI Standard 410. B. The primary surface shall be 5/8-inch O.D. copper tubes with inch nominal wall thickness. The tube joints shall be rolled for pressure tightness. The tube circuiting shall be completely drainable from a single location. 1. Bronze, spring type turbulators shall be provided in glycol coils only; use of turbulators in water coils will not be permitted. C. (Unless otherwise noted) the secondary surface shall be aluminum fins. Fins shall have belted collars and be bonded to tubes by mechanical expansion. A foam sealing strip shall be located between the casing bottom and fin ends to prevent air bypass and water carry-over. 1. The secondary surface for coil(s) CC- and CC- shall be copper fins. D. The coil shall have either cast iron, copper, or steel headers. Headers shall include air vent and drain plugs. E. Coil casing shall be the cartridge type, removable from the coil connection side of the casing and supported in tracks over the entire length of the coil. The coil casing shall be 304 stainless steel. F. Each coil shall be rated for working pressures up to 200 psig (300 psig) at 200 deg. F. G. Design Basis: Trane Type W. 2.4 DIRECT EXPANSION COOLING COILS A. Provide direct expansion cooling coils of the capacity and size as scheduled on the Drawings. Coil ratings shall be certified in accordance with ARI Standard 410 and shall meet the requirements of ASHRAE Standard Page 5 of 9

6 B. The primary surface shall be 5/8-inch O.D. seamless copper tubing with inch nominal wall thickness. 1. Tubes shall be fed with one piece low pressure drop venturi type refrigerant distributors arranged for downfeed with male sweat connections. Liquid lines shall be 1/4-inch Type S or 5/16-inch Type L copper. Each distributor shall feed a maximum of 12 refrigerant circuits. 2. The suction header shall be constructed of round seamless copper tubing. 3. All joints shall be silver soldered or brazed. 4. Where multiple refrigerant circuits are required by coil size (over approximately 18-inches tall) or application, the circuits shall be intertwined full face circuits. C. The secondary surface shall consist of aluminum fins. Fins shall have belted collars and shall be bonded to the tubes by mechanical expansion. A foam sealing strip shall be located between the casing bottom and fin ends to prevent air bypass and water carry-over. D. The coil casing shall be the cartridge type, removable from the coil connection side of the air handling unit casing and supported in tracks over the entire length of the coil. The coil casing shall be 304 stainless steel. E. Each coil shall be rated for working pressures up to 300 psig at 200 deg. F. The coil shall be suitable for use with refrigerant HCFC-22 (HFC-134a). Refer to "Condensing Units" Section for condensing unit requirements. 1. Each coil installed in air conditioning units or ductwork shall be constructed to withstand a temperature of 700 deg. F without refrigerant leakage into the airstream. F. Each coil shall be cleaned, dehydrated and sealed with dry nitrogen charge at the factory before shipment. G. Design Basis: Trane Type F. 2.5 REFRIGERANT CONDENSER COIL A. Provide refrigerant condenser coils of the capacity and size as scheduled on the Drawings. Coil ratings shall be certified in accordance with ARI Standard 410 and shall meet the requirements of ASHRAE Standard B. The primary surface shall be 5/8-inch O.D. seamless copper tubing with inch nominal wall thickness. 1. Suction and discharge headers shall be constructed of round seamless copper tubing arranged for draining the refrigerant condensate. Coils shall be arranged for air flow in the horizontal (vertical up) direction. 2. All joints shall be silver soldered or brazed. 3. Where multiple refrigerant circuits are required by application, the circuits shall be arranged to split the coil face into sections. C. The secondary surface shall consist of aluminum fins. Fins shall have belted collars and be bonded to the tubes by mechanical expansion. Page 6 of 9

7 D. The coil casing shall be the cartridge type, removable from either side of the air handling unit casing and supported by tracks over the entire length of the coil. (Unless otherwise noted) the coil casing shall be galvanized steel. 1. The casings for coils located directly downstream of cooling coils shall be 304 stainless steel. E. Each coil shall be rated for working pressures up to 300 psig at 250 deg. F. The coil shall be suitable for use with refrigerant HCFC-22 (or HFC-12) and for being located within close proximity of the refrigerant compressor discharge. Refer to Section for condensing unit requirements. 1. Each coil installed in air conditioning units or ductwork shall be constructed to withstand a temperature of 700 deg. F without refrigerant leakage into the airstream. F. Each coil shall be cleaned, dehydrated and sealed with a dry nitrogen charge at the factory before shipment. G. Design Basis: Trane Type H, 2.6 HOT (GLYCOL) WATER COILS A. Provide hot (glycol) water heating coils of the capacity and size as scheduled on the Drawings. Coil ratings shall be certified in accordance with ARI Standard 410 (and with proper modifications for use with ethylene glycol solutions). B. Primary surface shall be fabricated of 5/8-inch O.D. copper tubes with inch nominal wall thickness. The tube joints shall be rolled for pressure tightness. The tube circuiting shall be completely drainable from a single location. 1. Bronze, spring type, turbulators shall be provided in glycol coils only, use of turbulators in water coils will not be permitted. C. The secondary surface shall be aluminum fins. Fins shall have belted collars and be bonded to tubes by mechanical expansion. D. Coils shall have either cast iron, copper or steel headers. Headers shall include air vent and drain plugs. E. The coil casing shall be the cartridge type, removable from either the coil connection side or the opposite side of the air handling unit and supported in tracks over the entire length of the coil. (Unless otherwise noted) the coil casings shall be galvanized steel. 1. The casings for coils located directly downstream of cooling coils shall be 304 stainless steel. F. Each coil shall be rated for working pressures up to 200 psig at 250 deg. F. G. Design Basis: Trane Type W. 2.7 HOT GLYCOL COILS Page 7 of 9

8 A. Provide hot glycol water heating coils of the capacity and size as scheduled on the drawings. Coils shall be rated in accordance with ARI Standard 410 and with proper modifications for use with ethylene glycol water solutions. B. Hot glycol coils shall be the same as specified for hot water heating coils. C. Hot glycol coils shall be provided with bronze, spring type turbulators. 2.8 HOT WATER REHEAT COILS A. Provide as scheduled hot water heating coils with supply and return on same end of each coil. Coils shall be certified in accordance with ARI Standard 410. B. Primary surfaces shall be 5/8-inch O.D. tubes with inch nominal wall thickness. Tube joints shall be rolled for pressure tightness. The tubes shall form a single or double parallel continuous water circuit within the coil face. C. Secondary surface shall consist of aluminum fins. Fins shall have belted collars and shall be bonded to tubes by mechanical expansion. D. (Unless otherwise noted) The casing shall be constructed of galvanized sheet steel having provisions for bolting to ductwork on the top and bottom channels and on both ends. 1. The casing for coils located directly downstream of cooling coil shall be 304 stainless steel. E. Each coil shall be rated for working pressures up to 200 psig at 250 deg. F. F. Design Basis: Trane Type "T" or "TT". 2.9 HEAT RECOVERY COILS A. Provide heat recovery coils of the capacity and size as scheduled on the drawings. Coils shall be rated in accordance with ARI Standard 410 and with proper modifications for use with ethylene glycol/water solutions. B. Heat recovery coils in the outdoor air intake air stream shall be the same as specified for hot (glycol) water heating coils. C. Heat recovery coils in the exhaust air stream shall be the same as specified for chilled water cooling coils. D. Bronze, spring type turbulators shall be provided in glycol coils. PART 3 - EXECUTION 3.1 EXAMINATION Page 8 of 9

9 A. Examine ducts, plenums, and units to receive air coils for compliance with requirements for installation tolerances and other conditions affecting performance of the air coils. Verify piping rough-in dimensions. Do not proceed with installation until unsatisfactory conditions have been corrected. 3.2 INSTALLATION A. Install air coils and duct heaters as indicated, level and plumb, and according to manufacturer's written instructions, rough-in drawings, the original design, and referenced standards. B. Install air coils and duct heaters in metal ducts and casings constructed according to SMACNA "HVAC Duct Construction Standards." C. Anchor air coils in position using suitable supports. D. Install piping connections, maintaining manufacturer's recommended clearances for service and maintenance of coils. E. Install moisture eliminators as indicated. F. Install shutoff valves at coil inlet and outlet connections. G. Install galvanized-steel drain pan under each chilled-water coil. 1. Install galvanized-steel gutter underneath each coil above the lowest coil in stacked assemblies. 2. Construct drain pans to extend beyond coil length and width. Provide condensate trap and drainage. 3. Extend drain pan 10 inches beyond moisture eliminator. 4. Extend drain pan 10 inches beyond coil. H. Connect duct heaters and components to wiring systems and to ground as indicated and instructed by manufacturer. Tighten connectors and terminals, including screws and bolts, according to equipment manufacturer's published torque-tightening values for equipment connectors. Where manufacturer's torquing requirements are not indicated, tighten connectors and terminals according to tightening torques specified in UL 486A. 3.3 ADJUSTING A. Comb bent fins on each air coil. 3.4 CLEANING A. After completing system installation, including duct and fittings, clean coils using materials and methods recommended by manufacturers, and clean inside of casings and enclosures to remove dust and debris. END OF SECTION Page 9 of 9