DaimlerChryslerConstruction Standards

12/17/04

SECTION 15485 - ELECTRIC, DOMESTIC WATER HEATERS

PART 1 - GENERAL

1.1SUMMARY

  1. This Section includes the following for domestic water systems:
  2. Tankless, electric water heaters.
  3. Commercial, electric water heaters.
  4. Accessories.

1.2SUBMITTALS

  1. Product Data: For each type and size of water heater. Include rated capacities; shipping, installed, and operating weights; furnished specialties; and accessories.
  2. Shop Drawings: Detail water heater assemblies and indicate dimensions, weights, loads, required clearances, method of field assembly, components, and location and size of each field connection.
  3. Wiring Diagrams: Power, signal, and control wiring. Differentiate between manufacturer-installed and field-installed wiring.
  4. Maintenance Data: For water heaters to include in maintenance manuals.
  5. Warranties: Special warranties specified in this Section.

1.3QUALITY ASSURANCE

  1. Source Limitations: Obtain same type of water heaters through one source from a single manufacturer.
  2. Product Options: Drawings indicate size, profiles, and dimensional requirements of water heaters and are based on specific units indicated. Other manufacturers' products complying with requirements may be considered. Refer to Division1 Section "Substitutions."
  3. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA70, Article100, by testing agency acceptable to authorities having jurisdiction, and marked for intended use.
  4. ASHRAE Standards: Comply with performance efficiencies prescribed for the following:
  5. ASHRAE90.1, "Energy Efficient Design of New Buildings except Low-Rise Residential Buildings," for commercial water heaters.

1.4WARRANTY

  1. 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.
  2. Failures include heating elements and storage tanks.
  3. Warranty Period: From date of Substantial Completion:
  4. Heating Elements: Five years.
  5. Storage Tanks: 10.years.
  6. Temperature control and other appurtenances : 1 year.

PART 2 - PRODUCTS

2.1MANUFACTURERS

  1. Manufacturers: Unless otherwise directed by the Owner, provide products by one of the following:
  2. Point-of-Use, Tankless, Electric Water Heaters:
  3. Chronomite Laboratories, Inc.
  4. Electric Heater Co.
  5. HESco Industries, Inc.
  6. Hot Aqua, Inc.
  7. Lochinvar Corp.
  8. Niagara Industries.
  9. PVI Industries, Inc.
  10. Rheem Manufacturing Co.; Rheem Water Heater Div.
  11. Rheem Manufacturing Co.; Ruud Water Heater Div.
  12. Smith: A. O. Smith Water Products Co.
  13. State Industries.
  14. STIEBEL ELTRON, Inc.
  15. Light-Commercial, Storage, Electric Water Heaters:
  16. American Water Heater Co.
  17. Bradford White Corp.
  18. Electric Heater Corp.
  19. Lochinvar Corp.
  20. Patterson-Kelley Co.
  21. Rheem Manufacturing Co.; Rheem Water Heater Div.
  22. Rheem Manufacturing Co.; Ruud Water Heater Div.
  23. Smith: A. O. Smith Water Products Co.
  24. Commercial, Storage, Electric Water Heaters:
  25. American Water Heater Co.
  26. Bock Water Heaters, Inc.
  27. Bradford White Corp.
  28. Bryan Steam Corp.; Bryan Boilers Subsidiary.
  29. Cemline Corp.
  30. HESco Industries, Inc.
  31. Lochinvar Corp.
  32. Patterson-Kelley Co.
  33. Precision Parts Corp.
  34. PVI Industries, Inc.
  35. Rheem Manufacturing Co.; Rheem Water Heater Div.
  36. Rheem Manufacturing Co.; Ruud Water Heater Div.
  37. Smith: A. O. Smith Water Products Co.
  38. State Industries.
  39. Vaughn Manufacturing Corp.
  40. Water Heater Stand and Drain Pan Units:
  41. Safety: W. H. Safety Products, Inc.

2.2POINT-OF-USE, TANKLESS, ELECTRIC WATER HEATERS

  1. Description: Comply with UL499.
  2. Construction: Without hot-water storage.
  3. Working-Pressure Rating: 150 psig
  4. Tappings: ASMEB1.20.1, pipe thread.
  5. Interior Finish: Materials complying with NSF61, barrier materials for potable-water tank linings.
  6. Jacket: Aluminum or steel, with enameled finish, or plastic.
  7. Heating System: Electric-resistance type.
  8. Temperature Control: Adjustable thermostat.
  9. Safety Control: Automatic, high-temperature-limit cutoff device or system.
  10. Mounting: Bracket or device for wall mounting.

2.3LIGHT-COMMERCIAL, STORAGE, ELECTRIC WATER HEATERS

  1. Description: Comply with UL174 or UL1453, and listed by manufacturer for commercial applications.
  2. Storage Tank Construction: Non-ASME-code steel with 150-psig working-pressure rating.
  3. Tappings: Factory fabricated of materials compatible with tank for piping connections, relief valve, pressure gage, thermometer, drain, anode rod, and controls as required. Attach tappings to tank before testing and labeling. Include ASMEB1.20.1, pipe thread.
  4. Interior Finish: Materials and thicknesses complying with NSF61, barrier materials for potable-water tank linings. Extend finish into and through tank fittings and outlets.
  5. Insulation: Comply with ASHRAE90.1. Surround entire storage tank except connections and controls.
  6. Jacket: Steel, with enameled finish.
  7. Heating Elements: Two electric, screw-in, immersion type.
  8. Temperature Control: Adjustable thermostat for each element with wiring arrangement for simultaneous operation.
  9. Safety Controls: Automatic, high-temperature-limit and low-water cutoff devices or systems.
  10. Drain Valve: ASSE1005, corrosion-resistant metal, factory installed with hose end connection.
  11. Anode Rod: Factory installed, magnesium.
  12. Dip Tube: Factory installed. Not required if cold-water inlet is near bottom of storage tank.

2.4COMMERCIAL, STORAGE, ELECTRIC WATER HEATERS

  1. Description: Comply with UL1453.
  2. Storage Tank Construction: ASME-code steel with 150-psig working-pressure rating.
  3. 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.
  4. NPS2 and Smaller: Threaded ends according to ASMEB1.20.1, pipe threads.
  5. NPS2-1/2 and Larger: Flanged ends according to ASME B16.5 for steel and stainless-steel flanges and according to ASMEB16.24 for copper and copper-alloy flanges.
  6. Interior Finish: Materials and thicknesses complying with NSF61, barrier materials for potable-water tank linings. Extend finish into and through tank fittings and outlets.
  7. Insulation: Comply with ASHRAE90.1. Surround entire storage tank except connections and controls.
  8. Jacket: Steel, with enameled finish.
  9. Heating Elements: Electric, screw-in or bolt-on, immersion type arranged in multiples of three.
  10. Exception: Water heaters up to 9-kW input may have 2 or 3 elements.
  11. Staging: Input not exceeding 18kW per step.
  12. Temperature Control: Adjustable, immersion thermostat.
  13. Safety Controls: Automatic, high-temperature-limit and low-water cutoff devices or systems.
  14. Drain Valve: ASSE1005, corrosion-resistant metal, factory installed with hose end fitting.
  15. Anode Rods: Factory installed, magnesium.
  16. Dip Tube: Factory installed. Not required if cold-water inlet is near bottom of storage tank.

2.5WATER HEATER ACCESSORIES

  1. Combination Temperature and Pressure Relief Valves: ASME rated and stamped and complying with ASMEPTC25.3. Include relieving capacity at least as great as heat input and include pressure setting less than water heater working-pressure rating. Select relief valve with sensing element that extends into tank.
  2. Exception: Omit combination temperature and pressure relief valve for tankless water heater, and furnish pressure relief valve for installation in piping.
  3. Vacuum Relief Valves: Comply with ASMEPTC25.3. Furnish for installation in piping.
  4. Exception: Omit if water heater has integral vacuum-relieving device.
  5. Water Heater Mounting Brackets (Where Indicated): Water heater manufacturer's factory-fabricated, steel bracket for wall mounting and capable of supporting water heater and water.
  6. Drain Pans: Corrosion-resistant metal with raised edge. Include dimensions not less than base of water heater and include drain outlet not less than NPS3/4.

PART 3 - EXECUTION

3.1WATER HEATER INSTALLATION

  1. 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.
  2. Anchor water heaters to substrate.
  3. 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.
  4. 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.
  5. Install vacuum relief valves in cold-water-inlet piping.
  6. 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 Division15 Section "Plumbing Specialties" for drain valves.
  7. Install thermometers on water heater outlet piping. Refer to Division15 Section "Meters and Gages" for thermometers.
  8. Exception: Omit thermometers for commercial, point-of-use, water heater inlet piping.

3.2CONNECTIONS

  1. Piping installation requirements are specified in other Division15 Sections. Drawings indicate general arrangement of piping, fittings, and specialties.
  2. Install piping adjacent to machine to allow service and maintenance.
  3. Connect hot- and cold-water piping with shutoff valves and unions. Connect hot-water-circulating piping with shutoff valve, check valve, and union.
  4. Make connections with dielectric fittings where piping is made of dissimilar metal.
  5. Electrical Connections: Power wiring and disconnect switches are specified in Division16 Sections. Arrange wiring to allow unit service.
  6. Ground equipment.
  7. 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 UL486A and UL486B.

3.3FIELD QUALITY CONTROL

  1. In addition to manufacturer's written installation and startup checks, perform the following:
  2. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment.
  3. Verify that piping system tests are complete.
  4. Check for piping connection leaks.
  5. Check for clear relief valve inlets, outlets, and drain piping.
  6. Check operation of circulators.
  7. Energize electric circuits.
  8. Adjust operating controls.
  9. Adjust hot-water-outlet temperature settings. Do not set above 120 degF unless piping system application requires higher temperature.

END OF SECTION

ELECTRIC, DOMESTIC WATER HEATERS15485 - 1 of 5