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3. Remove the hose from the primary drain valve when draining is complete. 4. Remove the plugs, nipple, shut-off valve and any other piping unless they will remain for use in the system piping. 10 Domestic Piping SECTION IV - Domestic Piping General Piping Requirements • All plumbing must meet or exceed all local, state and national plumbing codes. • Use pipe dope or tape suitable for potable water. • Use isolation valves to isolate system components. • Install unions for easy removal of the ELITE from the system piping. Domestic Supply Pressure For applications in which the domestic supply pressure exceeds 70 psig it is recommended to install a pressure reducing valve on the cold water supply. Maintaining the cold water supply at or below 70 psig will prevent normal thermal expansion from repeatedly forcing the T&P relief valve open. Thermal Expansion If the cold water supply contains a backflow preventer, check valve and / or a pressure reducing valve, the installer must install a domestic thermal expansion tank on the cold water supply. (See Fig. 2 page 14) Installing a thermal expansion tank will prevent normal thermal expansion from repeatedly forcing the T&P relief valve open. When installing a thermal expansion tank ensure the charge pressure of the tank is equal to the cold water supply pressure at the point of installation. Consult the thermal expansion tank manufacturer’s instructions for further information on installation and sizing. CAUTION The Temperature / Pressure relief valve is not intended for constant duty, such as relief of pressure due to normal thermal expansion. Water Hammer Water hammer is the effect of sudden pressure changes occurring in the domestic piping. These pressure changes are typically the result of “fast acting” positive shut-off valves closing. These types of valves can be typically found on dishwashers and clothes washers. The effects of water hammering can cause damage to system components and tank welds on the unit. Installation of hammer arresters is recommended at these types of appliances, which incorporate “fast-acting” positive shut-off valves. Consult the manufacturer of water hammer arresters for recommendation on sizing and installation requirements. Temperature / Pressure Relief Valve The ELITE has a factory installed Temperature / Pressure Relief valve. Ensure the rating of the T&P relief valve is correctly sized as follows per AGA: Model AGA Rating F-25 100,000 Btu/hr F-30 200,000 Btu/hr F-35 200,000 Btu/hr F-40 200,000 Btu/hr F-45 200,000 Btu/hr 11 Domestic Piping The installer must install discharge piping onto the T&P relief valve. The discharge piping must be: • Made of material serviceable for temperatures of 250.F or greater. • Directed so that any hot water discharge flows away from all persons. • Directed to a suitable place of drainage. • Installed as to allow complete draining of the T&P relief valve and the discharge piping. •Terminated with a plain end, not with threads. CAUTION Failure to properly direct the discharge piping of the T&P relief valve may result in flooding of the area adjacent to the unit and or lower floors in the structure causing substantial property damage. The installer must not install the T&P relief valve discharge piping in a manner that is: • Excessively long: Using more than 2 elbows and/or 15 feet of discharge piping can reduce the discharge capacity. •Terminated directly into a drain: The discharge piping must terminate within 6 inches of the drain. Check with local plumbing codes for termination guidelines. • The discharge piping is plugged, reduced in size or restricted in any manner. • The discharge piping is subject to freezing. WARNING DO NOT install any valves between the T&P relief valve and the discharge piping. DO NOT plug the T&P relief valve or the discharge piping. Improper placement and piping of the T&P relief valve can cause severe personal injury, death or substantial property damage. Thermostatic Mixing Valve The ELITE contains a factory installed thermostatic mixing valve with built-in check valve. The operating range of the thermostatic mixing is 90.F to 120.F. For applications with a domestic recirculation loop, the recirculation pump should be controlled by an aquastat. The maximum recommended setting of the aquastat is 10.F lower than the thermostatic mixing valve setting. DANGER For proper operation of the thermostatic mixing valve and to prevent potential scalding hazards, the recirculation loop should be controlled by an aquastat. DO NOT use continuous recirculation. U-Tube Assembly The ELITE is supplied with a U-Tube Assembly that directs cold water to the thermostatic mixing valve. To install the U-Tube Assembly the installer must: 1. Disconnect the cold inlet adapter/union from the thermostatic mixing valve. 2. Using needle-nose pliers remove the plastic check valve assembly from the adapter. 12 Domestic Piping 3. Solder the U-Tube Assembly onto the adapter. (See Fig. 1) 4. Once the adapte...

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