SECTION (15486) - FUEL-FIRED, DOMESTIC WATER HEATERS
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1 SECTION (15486) - FUEL-FIRED, DOMESTIC WATER HEATERS System shall provide a complete hot water return throughout the entire system with balancing (flow control) valves not less than 10 feet from the end of any branch or riser. At a minimum, 1.0 gpm shall circulate through each riser. Recommended recovery should be from seconds. Hot water temperature at the guestrooms shall be maintained at degrees F. PART 1 GENERAL 1.01 SUMMARY A. Section Includes: 1. Gas fired water heaters. 2. Storage tanks. 3. Expansion tanks. 4. Accessories. B. Related Sections: 1.02 REFERENCES 1. Section (03300) - Cast-in-Place Concrete 2. Section (15050) Common Work Results for Plumbing 3. Section (15110) General Duty Valves for Plumbing Piping 4. Section (15122) - Meters and Gages for Plumbing Piping 5. Section (15440) Domestic Water Pumps 6. Section (15430) - Plumbing Equipment 7. Section (15550) - Breechings, Chimneys, and Stacks A. American National Standards Institute (ANSI) Publications: 1. Z Gas Water Heaters - Volume III, Storage Water Heaters with Input Ratings Above 75,000 Btu per Hour, Circulating and Instantaneous 1. [Z21.12] [a. Addenda 1 to ANSI Z , Draft Hoods ] [ b. Addenda 2 to ANSI Z and ANSI Z21.12A-1993, Draft Hoods ] 22_34_00, 2.2G, 2.3G 2. Z21.13 Gas-Fired Low Pressure Steam and Hot Water Boilers 3. Z21.15 Manually Operated Gas Valves for Appliances, Appliance Connector Valves and Hose End Valves 4. Z21.18 Gas Appliance Pressure Regulators 5. Z21.20 Automatic Gas Ignition Systems and Components 6. Z21.21 Automatic Valves for Gas Appliances (same as CSA 6.5) 7. Z21.22 Relief Valves for Hot Water Supply Systems B. American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Publications: Energy Code for Commercial and High-Rise Residential Buildings Energy Code for New Low-Rise Residential Buildings C. The American Society of Mechanical Engineers (ASME) Publications: PAGE 1 FILE: CFRST-Fuel-Fired, Domestic Water Heaters REVISED: 05/01/ , Marriott International, Inc. CFRST SPECMSTR-NEW BUILD
2 REVISED: 05/01/13 1. (The 2004) ASME Boiler and Pressure Vessel Code 2. B "Pipe Threads, General Purpose, Inch" 3. B16.5 Pipe Flanges and Flanged Fittings: NPS 1/2 through B16.24 Cast Copper Alloy Pipe Flanges and Flanged Fittings: Classes 150, 300, 400, 600, 900, 1500 and 2500 D. American Society of Sanitary Engineering (ASSE) Publications: Performance Requirements for Temperature Actuated Mixing Valves for Hot Water Distribution Systems E. Canadian Standards Association (CSA) Publications: 1. B125.1 Plumbing Supply Fittings F. National Fire Protection Association (NFPA) Publications: National Fuel Gas Code "National Electric Code" G. Underwriter's Laboratories, Inc. (UL) Publications: 1.03 SUBMITTALS A Standard For Wire Connectors and Soldering Lugs for Use With Copper Conductors B Standard for Wire Connectors for Use With Aluminum Conductors Standard for Motor-Operated Water Pumps Standard for Commercial-Industrial Gas Heating Equipment 1.04 QUALITY ASSURANCE A. Source Limitations: Obtain same type of water heaters through one source from a single manufacturer. B. Product Options: Drawings indicate size, profiles, and dimensional requirements of water heaters and are based on specific units indicated. C. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, Article 100, by testing agency acceptable to authorities having jurisdiction, and marked for intended use. D. ANSI Compliance: Provide gas water heaters that comply with ANSI standards for gas water heaters and related products and that bear AGA certification label. E. ASME Compliance: Fabricate and label water heater, hot-water storage tanks to comply with ASME Boiler and Pressure Vessel Code: Section VIII, "Pressure Vessels," Division 01. F. ASHRAE Standards: Comply with performance efficiencies prescribed for the following: 1.05 WARRANTY 1. ASHRAE 90.1, "Energy Efficient Design of New Buildings except Low-Rise Residential Buildings," for commercial water heaters. A. General Warranty: Special warranty specified in this Article shall not deprive Owner of other rights Owner may have under other provisions of the Contract Documents and shall be in addition to, and run concurrent with, other warranties made by Contractor under requirements of the Contract Documents. PAGE 2 FILE: CFRST-Fuel-Fired, Domestic Water Heaters CFRST SPECMSTR-NEW BUILD 2013, Marriott International, Inc.
3 B. Special Warranty: Written warranty, executed by manufacturer agreeing to repair or replace components of water heaters that fail in materials or workmanship within specified warranty period. 1. Failures include storage tanks, circulators, and burner assemblies. 2. Warranty Period: From date of Substantial Completion: PART 2 PRODUCTS 2.01 MANUFACTURERS a. Storage Tanks: Five (5) years. b. Circulators and Burner Assemblies: One (1) Year. c. Tank Type Water Heaters: Three (3) Year Leakage, One (1) Year Parts. d. Boilers: Five (5) Year Leakage, One (1) Year Parts. A. Approved Manufacturers 1. Gas Fired Water Heaters: (Power Vent, Storage Type) a. Lochinvar Corporation. ( ) b. A. O. Smith Water Products Co. ( ) 2. Gas Fired Water Heaters: (High Efficiency, Separated Combustion) a. Lochinvar Corporation. ( ) b. A. O. Smith Water Products Co. ( ) c. Raypak, Inc., a Rheem Company ( ) d. RBI Water Heaters ( ) 3. Expansion Tanks: a. Amtrol, Inc. ( ) b. A. O. Smith Water Products Co. ( ) c. Wessels Company. ( ) d. Taco, Inc. ( ) 2.02 GAS FIRED WATER HEATERS ([POWER VENT], STORAGE TYPE) A. Description: Comply with ANSI Z B. Storage Tank Construction: ASME -code steel with 160-psig working-pressure rating. 1. Tappings: Factory fabricated of materials compatible with tank for piping connections, relief valve, pressure gage, thermometer, drain, anode rods, and controls as required. Attach tappings to tank shell before testing and labeling. a. NPS 2 (DN50) and Smaller: Threaded ends according to ASME B1.20.1, pipe threads. b. NPS 2-1/2 (DN65) and Larger: Flanged ends according to ASME B16.5 for steel and stainless-steel flanges and according to ASME B16.24 for copper and copperalloy flanges. 2. Interior Finish: Materials and thicknesses complying with NSF 61, barrier materials for potable-water tank linings. Extend finish into and through tank fittings and outlets. PAGE 3 FILE: CFRST-Fuel-Fired, Domestic Water Heaters REVISED: 05/01/ , Marriott International, Inc. CFRST SPECMSTR-NEW BUILD
4 REVISED: 05/01/13 3. Insulation: Comply with ASHRAE Surround entire storage tank except connections and controls. 4. Jacket: Steel, with enameled finish. C. Burner: For use with atmospheric, automatic, powered vent water heaters for natural-gas fuel. 1. Temperature Control: Adjustable thermostat. 2. Safety Controls: Automatic, high-temperature-limit and low-water cutoff devices or systems. 3. Automatic Ignition: ANSI Z21.20, automatic gas-ignition system and components. D. Anode Rods: Factory installed, magnesium. E. Dip Tube: Factory installed. Not required if cold-water inlet is near bottom of storage tank. F. Drain Valve: ASSE 1005, corrosion-resistant metal, factory installed. G. Draft Control: Draft diverter; comply with ANSI Z21.12 or Powered-vent system GAS FIRED WATER HEATERS (HIGH EFFICIENCY) A. Description: Configuration and components complying with appropriate requirements of ANSI Z21.13 and UL 795, with nominal efficiency rating not less than 83.7 percent. B. Unit Construction: ASME code with 160-psig working-pressure rating. 1. Tappings: Factory fabricated of materials compatible with tank for piping and other connections as required. Attach tappings to unit before testing and labeling. a. NPS 2 (DN50) and Smaller: Threaded ends according to ASME B1.20.1, pipe threads. b. NPS 2-1/2 (DN65) and Larger: Flanged ends according to ASME B16.5 for steel and stainless-steel flanges and according to ASME B16.24 for copper and copperalloy flanges. 2. Interior Finish: Corrosion-resistant metal or materials and thicknesses complying with NSF 61, barrier materials for potable-water tank linings. Extend finish into and through tank fittings and outlets. 3. Insulation: Comply with ASHRAE Jacket: Steel, with enameled finish. C. Burner: For use with natural-gas fuel, and complying with appropriate requirements of UL 795. D. Hot-Water Storage Tank: Connected with piping to circulator and water heater. 1. Construction: According to ASME Boiler and Pressure Vessel Code: Section VIII, steel with 125-psig working-pressure rating. a. Tappings: Factory fabricated of materials compatible with tank for piping connections, relief valve, pressure gage, thermometer, drain, anode rods, and controls as required. Attach tappings to tank shell before testing and labeling. 1) NPS 2 and Smaller: Threaded ends according to ASME B1.20.1, pipe threads. 2) NPS 2-1/2 and Larger: Flanged ends according to ASME B16.5 for steel and stainless-steel flanges and according to ASME for copper and copperalloy flanges. PAGE 4 FILE: CFRST-Fuel-Fired, Domestic Water Heaters CFRST SPECMSTR-NEW BUILD 2013, Marriott International, Inc.
5 b. Interior Finish: Materials and thicknesses complying with NSF 61, barrier material for potable water tank linings. Extend finish into and through tank fittings and outlets. c. Insulation: Comply with ASHRAE Surround entire storage tank except connections and controls. 2. Anode Rods: Factory installed magnesium. 3. Drain Valve: ASSE 1005, corrosion-resistant metal, factory installed. E. Circulator: UL 778, all bronze, in-line, centrifugal, single-stage, radially split case design, with mechanical seals; with 125-psig minimum working-pressure rating and 225 deg F continuous water temperature. F. Piping: Manufacturer s standard copper tubing. G. Draft Control: Draft diverter; comply with ANSI Z21.12 or Powered-vent system EXPANSION TANKS A. Description: Steel, pressure-rated tank constructed with welded joints and factory-installed, butyl-rubber diaphragm. Include air precharge to minimum system-operating pressure at tank. B. Construction: 150-psig working-pressure rating. C. Tappings: Factory-fabricated steel, welded to tank before testing and labeling. Include ASME B1.20.1, pipe thread. D. Tank Interior Finish: Materials and thicknesses complying with NSF 61, barrier materials for potable-water tank linings. Extend finish into and through tank fittings and outlets. E. Tank Exterior Finish: Manufacturer's standard, unless finish is indicated. F. Air-Charging Valve: Factory installed WATER HEATER ACCESSORIES A. Combination Temperature and Pressure Relief Valves: According to the following: 1. Gas Water Heaters: ANSI Z21.22, combination temperature and pressure relief valve. 2. Option: Separate temperature and pressure relief valves are acceptable instead of combination relief valve. B. Pressure Relief Valves: According to the following: 1. Gas Water Heaters: ANSI Z21.22 pressure relief valve for storage tanks of 200,000 Btuh (58.6 kw). C. Vacuum Relief Valves: According to the following: 1. Gas Water Heaters: ANSI Z Exception: Omit if water heater has integral vacuum-relieving device. D. Gas Shutoff Valves: ANSI Z21.15, manually operated. Furnish for installation in piping. E. Gas Pressure Regulators: ANSI Z21.18, appliance type, factory or field installed. Include pressure rating, capacity, and pressure differential required for water heater and gas supply. F. Automatic Valves: ANSI Z21.21, appliance, electrically operated, on-off automatic valve. G. Digital recirculation valve, ASSE 1017 & CSA B , appliance, electronically operated mixing valve. Note: Select stand type or wall mounting brackets below. PAGE 5 FILE: CFRST-Fuel-Fired, Domestic Water Heaters REVISED: 05/01/ , Marriott International, Inc. CFRST SPECMSTR-NEW BUILD
6 H. Water Heater Stand and Drain Pan Units: High-density-polyethylene-plastic, 18-inch-high, enclosed-base stand complying with IAPMO PS 103 and IAS No. 2. Include integral or separate drain pan with raised edge and NPS 1 (DN25) drain outlet with ASME B1.20.1, pipe thread. I. Water Heater Stands: Water heater manufacturer's factory-fabricated, steel stand for floor mounting and capable of supporting water heater and water. Include dimension that will support bottom of water heater a minimum of 18 inches above the floor. J. Water Heater Mounting Brackets: Water heater manufacturer's factory-fabricated, steel bracket for wall mounting and capable of supporting water heater and water. K. Drain Pans: Corrosion-resistant metal with raised edge. Include dimensions not less than base of water heater and include drain outlet not less than NPS 3/4 (DN20). L. Piping Manifold Kits: Water heater manufacturer's factory-fabricated inlet and outlet piping arrangement for multiple-unit installation. Include piping and valves for field assembly that is capable of isolating each water heater and of providing balanced flow through each water heater. M. Piping-Type Heat Traps: Field-fabricated piping arrangement according to ASHRAE 90.1 or ASHRAE PART 3 EXECUTION 3.01 CONCRETE BASES A. Install concrete bases of dimensions indicated. Refer to Section "Cast-in-Place Concrete" and Section "Common Work Results for Plumbing." 3.02 WATER HEATER INSTALLATION A. Install commercial water heaters on concrete bases. REVISED: 05/01/13 1. Exception: Omit concrete bases for commercial water heaters if installation on stand, bracket, suspended platform, or direct on floor is indicated. B. Install water heaters, level and plumb, according to layout drawings, original design, and referenced standards. Maintain manufacturer's recommended clearances. Arrange units so controls and devices needing service are accessible. C. Anchor water heaters to substrate. D. Where required, install seismic restraints for water heaters. Anchor to substrate. E. Install and connect gas water heaters according to NFPA Install appliance, gas pressure regulators on gas-burner inlets of water heaters without pressure regulators. 2. Install vent piping from gas-train pressure regulators and valves to outside of building where required. Terminate vent piping with brass-screened vent cap fitting. Do not combine vents except with approval of authorities having jurisdiction. F. Install temperature and pressure relief valves in top portion of storage tanks. Use relief valves with sensing elements that extend into tanks. Extend relief valve outlet with water piping in continuous downward pitch and discharge onto closest floor drain. G. Install pressure relief valves in water piping for water heaters without storage. Extend relief valve outlet with water piping in continuous downward pitch and discharge onto closest floor drain. H. Install vacuum relief valves in cold-water-inlet piping. PAGE 6 FILE: CFRST-Fuel-Fired, Domestic Water Heaters CFRST SPECMSTR-NEW BUILD 2013, Marriott International, Inc.
7 I. Install vacuum relief valves in water heater storage tanks that have copper lining. J. Install water heater drain piping as indirect waste to spill into open drains or over floor drains. Install hose-end drain valves at low points in water piping for water heaters that do not have tank drains. Refer to Section "Plumbing Specialties" for drain valves. K. Install thermometers on water heater inlet and outlet piping. Refer to Section "Meters and Gages for Plumbing Piping" for thermometers. L. Assemble and install inlet and outlet piping manifold kits for multiple water heaters. Fabricate, modify, or arrange manifolds for balanced water flow through each water heater. Include shutoff valve, and thermometer in each water heater inlet and outlet, and throttling valve in each water heater outlet. Refer to Section "General Duty Valves for Plumbing Piping" for general-duty valves and Section "Meters and Gages for Plumbing Piping" for thermometers. M. Arrange for insulation on equipment and piping not furnished with factory-applied insulation. N. Install piping-type heat traps on inlet and outlet piping of water heater storage tanks without integral or fitting-type heat traps. O. Fill water heaters with water. P. Charge expansion tanks with air as required by manufacturer CONNECTIONS A. Piping installation requirements are specified in other Division 22 Sections. Drawings indicate general arrangement of piping, fittings, and specialties. B. Install piping adjacent to machine to allow service and maintenance. C. Connect hot- and cold-water piping with shutoff valves and unions. Connect hot-watercirculating piping with shutoff valve, check valve, and union. D. Connect gas piping to gas burner with drip leg, tee, shutoff valve, and union; minimum size same as inlet connection. E. Make connections with dielectric fittings where piping is made of dissimilar metal. F. Gas, Water Heater Vent Connections: Connect to vent system. Include draft hoods and diverters where required. Use vents same size as or larger than water heater outlets, but not smaller than indicated unless smaller vent size has been calculated according to NFPA 54. Comply with gas utility requirements for sizing. Gas vents are specified in Section "Breechings, Chimneys, and Stacks." Provide ducted combustion air. G. Electrical Connections: Power wiring and disconnect switches are specified in Division 26 Sections. Arrange wiring to allow unit service. H. Ground equipment. 1. Tighten electrical connectors and terminals according to manufacturer's published torque-tightening values. If manufacturer's torque values are not indicated, use those specified in UL 486A and UL 486B FIELD QUALITY CONTROL A. Engage a factory-authorized service representative to perform startup service. B. In addition to manufacturer's written installation and startup checks, perform the following: 1. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment and retest until satisfactory results are achieved. 2. Verify that piping system tests are complete. PAGE 7 FILE: CFRST-Fuel-Fired, Domestic Water Heaters REVISED: 05/01/ , Marriott International, Inc. CFRST SPECMSTR-NEW BUILD
8 3. Check for piping connection leaks. 4. Check for clear relief valve inlets, outlets, and drain piping. 5. Check operation of circulators. 6. Test operation of safety controls, relief valves, and devices. 7. Energize electric circuits. 8. Adjust operating controls. 9. Adjust hot-water-outlet temperature settings. Do not set above 140 deg F unless piping system application requires higher temperature. 10. Balance water flow through manifolds of multiple-unit installations DEMONSTRATION A. Engage a factory-authorized service representative to train Owner's maintenance personnel to adjust, operate, and maintain water heaters. 1. Conduct training as specified in Section (01820) "Training. 2. Train Owner's maintenance personnel on procedures for starting and stopping troubleshooting, servicing, and maintaining equipment. END OF SECTION REVISED: 05/01/13 PAGE 8 FILE: CFRST-Fuel-Fired, Domestic Water Heaters CFRST SPECMSTR-NEW BUILD 2013, Marriott International, Inc.
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