Section 42. Lead Paint Risk Factor NONE WATER HEATER STORAGE GAS
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1 WATER HEATER STORAGE GAS Lead Paint Risk Factor NONE TABLE OF CONTENTS PART 1: INSTALLATION REQUIREMENTS FOR CONVENTIONAL HOMES... 1 WATER HEATER REPAIR APPLIANCE REPAIR... 1 WATER HEATER INSTALLATION GENERAL REQUIREMENTS APPLIANCE SIZING LOCATION INSTALLATION ACCESS TO UNIT CLEARANCES SEISMIC BRACING PLUMBING DRAIN PAN TEMPERATURE AND PRESSURE REGULATION GAS LINES, FITTINGS AND VALVES COMBUSTION AIR REQUIREMENTS VENT SYSTEM THERMAL EFFICIENCY... 7 PART 2: MOBILE HOME CRITERIA INSTALLATION DRIP PAN MOBILE HOME GAS VENT TERMINAL COMBUSTION AIR REQUIREMENTS (MOBILE HOMES) ISOLATION OF RETURN AIR... 9 PART 3: MULTI-FAMILY WHOLE BUILDING CRITERIA MULTI-FAMILY INSTALLATION REQUIREMENTS... 9 PART 4: MEASURE-SPECIFIC POST-INSTALLATION REQUIREMENTS APPLIANCE REMOVAL AND DISPOSAL OPERATIONAL CHECKS CLIENT EDUCATION TOC
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3 WATER HEATER STORAGE GAS PART 1: INSTALLATION REQUIREMENTS FOR CONVENTIONAL HOMES WATER HEATER REPAIR 1. APPLIANCE REPAIR - When assessment and CAS testing indicate operational fail of the water heater: Applicable repairs shall be made in conformance with the CSD Field Guide and by a qualified technician. Repairs shall be made in conformance with manufacturer s specifications and applicable code requirements. - Platform/Enclosure Floor Repair The flooring under the water heater shall be checked for structural integrity to safety and properly support the water heater. If unsafe, it shall be corrected as a Limited Home Repair before a water heater is repaired or replaced. - Temperature and Pressure Regulation When either a Temperature and Pressure (T&P) relief valve, or an automatic gas shut-off valve plus pressure-relief valve, is not present or is capped off, it shall be repaired in conformance with the CSD Field Guide and Item 11 of this section. - Abandonment of Appliance When repair or replacement of the water heater is beyond the program scope, it shall be offered to the client to abandon the appliance per the CSD Field Guide Appendix A (Combustion Appliance Safety Protocol). - Flexible Gas Connector Check shall be made for presence of unsafe gas connector, which shall be replaced per the CSD Field Guide Appendix A. - Vent Repair/Extension When appliance vent requires repair or extension, the CSD Field Guide Appendix A policies shall apply. Use of UL-181 tape shall never be allowed as a method to seal appliance vent joints. WATER HEATER INSTALLATION 2. GENERAL REQUIREMENTS - Installation shall be in conformance with: Product listing, and manufacturer s instructions and specifications Applicable codes, including the current California Electrical Code (CEC), California Plumbing Code (CPC), and local codes. Any existing water leaks shall be repaired before installation begins. 3. APPLIANCE SIZING - Replacement Water Heater Capacity, the First Hour Rating Unit shall comply with the greater of: - Manufacturer s sizing recommendations, or - Applicable code requirements. Storage unit capacity shall be not less than the Uniform Plumbing Code (UPC) minimum First Hour Rating guidelines, as shown in Table When enclosure size limitations restrict the replacement unit s capacity, sizing for a smaller unit requires a program waiver and proper documentation of the condition in the client file. 42-1
4 TABLE 42-1: MINIMUM CAPACITY FOR WATER HEATERS (FIRST HOUR RATING) Number of Bathrooms 1 to to to 3.5 Number of Bedrooms First Hour Rating* * First Hour Rating is water heating capacity expressed in gallons. In other words, it is the amount of hot water the heater can supply per hour (starting with a tank full of hot water). Find the First Hour Rating on the yellow EnergyGuide label to determine the size of tank needed. 4. LOCATION - All Units Location shall be structurally sized/constructed to safely support the weight of the tank. - Units in Attics Water heater shall not be installed in attic with whole house or attic exhaust fan, unless it has a sealed combustion chamber. - Bedrooms and Bathrooms An open combustion water heater shall not be installed in a bedroom or bathroom, unless it is inside a dedicated closet (and no other appliances will be present in the enclosure). The closet shall have a weatherstripped door with self-closing hinges, and all combustion air shall be drawn from outdoors. - Units in Garages and Hazardous Locations When installed in a garage, unit shall be elevated so that the combustion burner is at least 18" above the finished floor, unless it is an FVIR unit and elevation is not required by manufacturer s instructions or local code. Units in locations subject to damage (e.g. by an automobile) shall be protected by being elevated, or with barriers or other means prescribed by local code. 5. INSTALLATION - The tank shall be installed: Plumb and level in a stable position. With minimum clearance in accordance with manufacturer s instructions. With information labels and controls facing outward. - Support Units supported from the ground shall rest on a level code-compliant base, which extends at least 3" above grade. - Orifice Size Burner orifice shall be verified to be appropriate for type of fuel gas used. - Plumbing Only new parts shall be installed. Threaded fittings shall be sealed with Teflon tape or non-toxic pipe joint compound. A cold water supply shutoff valve shall be installed if not present. Flexible connectors shall be used to connect the tank to the rigid hot and cold water lines. Dielectric insulators shall be installed on water piping connections to the tank when required by local code. - House Line Pressure House line pressure shall be checked (e.g., with a pressure gauge attached to a hose bib) to be in compliance with the water heater manufacturer s specifications. 42-2
5 House line pressure shall be checked when: - The area is known to have high water pressure; and - Wherever evidence suggests that high line pressure may be present. When water pressure to the home exceeds water heater manufacturer s specifications, a house line pressure regulator shall be installed or replaced to reduce the pressure reaching the water heater below the specified maximum. 6. ACCESS TO UNIT - Units in Enclosures Access door shall be at least 24" wide, and high enough to allow removal of the existing appliance. - Units in Attics Access shall have a minimum 22" x 30" opening, with unobstructed passageway, and a minimum 30" x 30" working platform on the front service side of the water heater CLEARANCES - All Units Clearances shall be in compliance with listing requirements, manufacturer s instructions, the California Plumbing Code (CPC), and local code. Clearances shall be adequate to not interfere with combustion air, T&P relief, or access for maintenance. - Clearance from Gas Meter An open combustion water heater (including FVIR-listed) shall have minimum 3' clearance between its source of combustion and the gas meter. 8. SEISMIC BRACING - Requirement The tank shall be braced (strapped or anchored) to resist horizontal movement during an earthquake only when a replacement water heater is installed. Earthquake straps and braces shall be attached directly to tank (not to the water pipes). - Bracing shall be: Installed per manufacturer s instructions and local code. Securely attached to structural framing or ledger board. - Strap Locations Two straps shall be installed: - One within the upper third of the tank, and - One within the lower third of the tank. The lower strap shall be at least 4" above the gas control valve. 9. PLUMBING - All Units All fittings and valves shall be installed using NEW materials per manufacturer s instructions and local code. PEX tubing shall not be installed within the first 18 of piping connected to a water heater. Threaded fittings shall be sealed with Teflon tape or non-toxic pipe joint compound. A cold water supply shutoff valve shall be installed if not present. Flexible connectors shall be used to connect the tank to the rigid hot and cold water lines. 42-3
6 Dielectric insulators shall be installed on water piping connections to the tank, when required by local code. Backflow prevention shall be installed in accordance with manufacturer specifications and in accordance with the authority having jurisdiction. 10. DRAIN PAN - Storage Units A watertight pan of corrosion-resistant material shall be installed when the water heater is located in: - An attic or on a floor-ceiling assembly, or - Other location for which a pan is required by local code. Drain pan shall be 4 in height if leakage is likely to cause damage to the home. - Drain A minimum 3/4" diameter drain line from the pan shall be installed with a continuous downward slope to the exterior, or to a drain system, in accordance with local code. Drain pan shall not inhibit proper combustion air flow. 11. TEMPERATURE AND PRESSURE REGULATION - Safety Controls One of the following shall be installed in conformance with the water heater manufacturer s instructions and local code: - A Temperature and Pressure (T&P) Relief Valve with drain line, or - An automatic gas shutoff valve and pressure-relief valve, when T&P valve and drain line are not feasible. - The T&P Relief Valve and Automatic Gas Shutoff Valve: Shall meet the sizing/pressure requirements of the water heater listing and be compliant with the requirements of the local jurisdiction. - T&P Relief Valve Drain Line Line shall be galvanized steel, hard drawn copper, or CVPC. Internal diameter of the line and fittings shall equal or exceed diameter of the relief valve outlet. The line shall drain fully by gravity and shall not be trapped, and it shall not discharge into the drain pan. Drain line shall terminate outside the building, or in an approved drain system, with the terminal end: - No more than 24", nor less than 6", above the surface, and - Unthreaded and pointing downward. - Expansion Tank A potable water expansion tank shall be installed on the cold water side. A direct connection with no valves between the storage tank and expansion tank shall be installed in accordance with the authority having jurisdiction, and according to manufacturer specifications. 42-4
7 12. GAS LINES, FITTINGS AND VALVES - All Units Nonconforming items, such as rigid or flexible copper connector, shall be replaced with code-compliant materials. All gas lines, flexible gas connectors, fittings and valves shall be installed using new materials per manufacturer s instructions and local code. Gas shutoff valve and flexible gas connector shall be new (existing shall not be reused. Manual gas shutoff valve shall be within 3' of the appliance and in the same room where the appliance is located. A flexible gas connector shall be located between the gas control valve and shutoff valve. Readily-accessible sediment trap (drip leg) shall be located just ahead of flexible gas connector, when required by local code. All new and affected gas lines, flexible gas connectors, fittings, and valves shall be checked for gas leaks using a method approved by the local jurisdiction. 13. COMBUSTION AIR REQUIREMENTS - All Units Combustion air shall be supplied in conformance with manufacturer s instructions, local code, and CSD Field Guide Appendix A. Obstructions in existing combustion air vents (e.g., overblown insulation) shall be cleared as needed to provide required NFVA. 14. VENT SYSTEM - All Systems Appliance venting shall be in conformance with manufacturer s instructions and local code. - Pipe located outdoors, or exiting through a ceiling or wall, must be type B (double wall). Existing components shall be replaced with new components (as required) to ensure that the entire vent system conforms with the appliance listing and code requirements. Vent dampers shall not be used. Type B vent pipe shall be used outdoors, and the vent cap shall be at least 5' in vertical height above the draft hood. Horizontal vent connectors shall not dip or sag and shall slope upward a minimum of 1/4" per foot of horizontal length. Gas vents shall be supported in accordance with their listings and manufacturer s instructions. - Type B Gas Vents Vents with Listed vent caps 12" in size or smaller shall be in compliance with the California Mechanical Code. 2 - Existing vents shall terminate minimum 1' above a roof (for slopes up to 6/12), provided the vent is located at least 8' from a vertical wall or similar obstruction. - Vents within 8' of a vertical wall or obstruction must terminate: At least 2' above the highest point where they pass through the roof, and At least 2' higher than any portion of the building within 10'. 42-5
8 14. VENT SYSTEM (cont.) - Type B Gas Vents (cont.) Vent terminations located within 10' of outside-air, makeup-air, and forced-air/cooler inlets shall terminate at least 3' above such inlets. A gas vent extending through an exterior wall shall not terminate adjacent to the wall or below the eaves. All gas vents shall extend through the roof flashing, or roof jack, and terminate with a listed cap or listed roof assembly. Vent pipes shall be supported in accordance with their listing and manufacturer s instructions. - Through-Wall Mechanical Draft Vent Terminals A mechanical draft venting system shall terminate at least 3' above any forced air inlet (e.g., evaporative cooler) located within 10'. A mechanical draft venting system (other than direct vent) shall terminate the following minimum distances from doors, operable windows and gravity inlets into a building: - 1' above, or 4' below, or - 4' horizontally from the door/window/inlet. - Common Vents A common vent system serving both the Water Heater and another appliance shall be sized in accordance with local code and the California Mechanical Code
9 14. VENT SYSTEM (cont.) - Water Heater in Outdoor Enclosure Adjacent to Sidewall Vent pipe shall be extended as illustrated below, or in accordance with local code, if more stringent when: - The horizontal measurement from the center of the vent termination to an adjacent operable door or window is 4-feet or less. The horizontal measurement from the center of the appliance draft hood to an adjacent operable door or window is 4-feet or less. The replacement/extended vent pipe must be Type B, and it must terminate at least 1' above the dwelling roof when: - The vent pipe penetrates the roof overhang, or - It is located immediately adjacent the roof edge and secured by a clamp to the fascia. If the vent pipe is located further away from the roof edge, it must extend to: - At least 2' above the roof edge, and - 2' higher than any portion of the building within 10'. If offsets are used (e.g., to avoid penetrating the roof overhang), offsets shall not exceed 45, except one 60 offset is allowed. 15. THERMAL EFFICIENCY - Hot and Cold Water Pipes Pipe insulation shall be installed in accordance with CSD WIS Section 18 (Water Heater Pipe Insulation). Heat traps shall be installed on the inlet and outlet piping, where not provided by manufacturer. - Tank Replacement water heaters shall have a minimum internal insulation of at least R-12; therefore, no additional external insulation shall be installed in accordance with CSD WIS Section 16 (Water Heater Insulation). Because California regulations for internal tank insulation exceed the federal regulations, an external insulation blanket shall not be installed on a replacement water heater. 42-7
10 PART 2: MOBILE HOME CRITERIA 16. INSTALLATION - Water heater shall be: In compliance with requirements of the California Department of Housing and Community Development (HCD). Have maximum standby loss of 7% (25 to 35 gallons) or 6% (over 35 gallons). 4 Water heater is not required to be listed/labeled for installation in a mobile home, unless required be HCD. - Access requirements and unit installation shall be in conformance with: Manufacturer s instructions, and HCD requirements, and Installation guidelines in this section. 17. DRIP PAN - Drip Pan and Lower CVA Vent A drip pan shall be installed and drained per HCD regulations. If the drip pan covers existing CVA venting in the floor, a new lower CVA vent shall be installed within 12" of the compartment floor. 18. MOBILE HOME GAS VENT TERMINAL - Vent pipes shall not terminate under the mobile home. - Water Heater Vent Terminals A water heater vent pipe located near an evaporative cooler shall terminate at least 3' from the cooler intake. If this requirement is not met, infiltrationreduction measures shall not be installed. - Exception for Inoperable Cooler When an Evaporative Cooler is inoperable, or the property owner wants it abandoned, vent terminal clearances do not apply if the Cooler is removed and the roof opening is sealed. 19. COMBUSTION AIR REQUIREMENTS (MOBILE HOMES) - Open Combustion Water Heater Combustion Air Venting An upper combustion air vent shall be present, such as: - A double concentric vent pipe in the ceiling: Appliance vent pipe surrounded by air space and a larger-diameter outer pipe. NFVA is the cross-sectional area of the larger pipe minus the crosssectional area of the smaller pipe. - An undampered vent (screen or grille) installed in the enclosure ceiling, or in the door or outer wall and located to begin within 12 of the enclosure ceiling. 42-8
11 19. COMBUSTION AIR REQUIREMENTS (MOBILE HOMES) (cont.) - Open Combustion Water Heater Combustion Air Venting (cont.) A lower combustion air vent (undampered screen or grille to outdoors) shall be present, located in: - The enclosure floor, or - The door or wall located to begin within 12 above the floor. A continuous duct extending from the enclosure to the outdoors may be used to supply upper or lower combustion air venting. CVA vent NFVA shall be in accordance with the CSD Field Guide Appendix A. 20. ISOLATION OF RETURN AIR - The return air system shall not have leaks which: Depressurize any open combustion appliance enclosure. Draw in combustion air or combustion gases from any open combustion appliance (e.g., from furnace itself or nearby water heater). Depressurize or draw air from a space where hazardous chemicals are stored or toxic fumes may be present. - The following conditions are not allowed: An open combustion FAU drawing non-ducted return air through a grille in the furnace housing. A closed combustion FAU located in an appliance enclosure adjacent to an open combustion water heater when: - The furnace enclosure is part of the return system and - The two appliances are not separated by an airtight barrier. - Required Corrections Any condition allowing pollutants from the water heater to be drawn into the FAU return shall be corrected by constructing an isolation barrier between the two appliances. PART 3: MULTI-FAMILY WHOLE BUILDING CRITERIA 21. MULTI-FAMILY INSTALLATION REQUIREMENTS - General All measure installation for these projects must conform to the latest adopted version of the and the DOE Standard Work Specifications for Multi-Family Home Energy Upgrades, which is incorporated here by reference and available at:
12 PART 4: MEASURE-SPECIFIC POST-INSTALLATION REQUIREMENTS 22. APPLIANCE REMOVAL AND DISPOSAL - Requirements of the local jurisdiction shall be followed to: Remove old water heater and associated components. Seal any unused chimney openings and penetrations. Remove unused oil tank, lines, valves, and associated equipment. All work shall be completed by a licensed plumbing (C-36) professional where required by the authority having jurisdiction and installed to industry-accepted standards. - Shell or Structural Damage Any penetrations to the exterior of the home created by the installation of the replacement water heater shall be sealed. 23. OPERATIONAL CHECKS - Water Heater Operation/Commissioning The water heater shall be tested in compliance with manufacturer specifications and relevant industry standards and shall perform properly and safely. - Thermostat Temperature Thermostats shall be set at 120 F, unless higher temperature is requested by the client or is required for medical reasons, or as prescribed by local code. - Combustion Appliance Safety Testing Post-CAS Appliance Repair and Replacement testing shall be conducted in accordance with the CSD Field Guide Appendix A. The appliance shall pass CAS Testing. - Other Appliances Appliances turned off during the installation of the water heater shall be returned to standard operating condition (i.e., pilot lights shall be re-lit, if necessary). 24. CLIENT EDUCATION - Safety Client will be provided information regarding the health effects and risk of high carbon monoxide concentrations, as well as a list of monitors that provide more detail regarding CO levels. - Operations and Maintenance Clients shall be educated on the safe and efficient operation and maintenance of the system, including: - Adjustment of water temperature and target temperature in accordance with local code. - Periodic drain and flush. - Expansion tank and backflow preventer (no occupant maintenance required). - Periodic inspection, maintenance, or replacement. REFERENCED STANDARDS CPC CMC CMC ANSI Z and addendums 1a-1991 and 1b
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