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Replacing the relief valve will not correct the problem. If the water heater is installed in a closed water supply system, such as one having a backflow preventer in the cold water supply line, means shall be provided to control thermal expansion. Contact the water supplier or local plumbing inspector on how to control this situation. A properly sized expansion tank must be installed to prevent the water pressure from building to such a level in a Closed System. The manufacturer of this water heater will void the warranty if there is a failure to install a properly sized expansion tank. Combination Space Heating/Potable Water System Some water heater models are equipped with inlet/outlet connections for use in space heating applications. If this water heater is to be used to supply both space heating and potable (drinking) water, the instructions listed below must be followed (see fi gure 17). • Be sure to follow the manual(s) shipped with the air handler or other type heating system. • This water heater is not to be used as a replacement for an existing boiler installation. • Do not use with piping that has been treated with chromates, boiler seal or other chemicals and do not add any chemicals to the water heater piping. *100 Gallon Model Shown. 17 • If the space heating system requires water temperatures in excess of 120°F, a tempering valve (provided) must be installed per the manufacturer’s instructions in the potable hot water supply to limit the risk of scald injury. • Pumps, valves, piping and fi ttings must be compatible with potable water. • A properly installed fl ow control valve is required to prevent thermosiphoning. Thermosiphoning is the result of a continuous fl ow of water through the air handler circuit during the off cycle. Weeping (blow off) of the temperature and pressure relief valve (T & P) or higher than normal water temperatures are the fi rst signs of thermosiphoning. • The hot water line from the water heater should be vertical past any tempering valve or supply line to the heating system to remove air bubbles from the system. • Do not connect the water heater to any system or components previously used with non-potable water heating appliances when used to supply potable water. Storage Tank Installation When installing the Polaris® with a storage tank, see figure 18 for piping suggestions. Solar Installation If this water heater is used as a solar storage heater or as a backup for the solar system, the water supply temperatures to the water heater tank may be in excess of 120°F. A tempering valve must be installed in the water supply line to limit the supply temperature to 120°F. Note: Solar water heating systems can often supply water with temperatures exceeding 180°F and may result in water heater malfunction. Figure 17: Air Handler Piping Installation Massachusetts code does not allow this type of installation. *100 Gallon Model Shown. 18 Temperature and Pressure Relief Valve For protection against excessive pressures and temperatures, a temperature and pressure relief valve must be installed in the opening marked “T & P RELIEF VALVE”. This valve must be design certified by a nationally recognized testing laboratory that maintains periodic inspection of the production of listed equipment or materials as meeting the requirements for Relief Valves and Automatic Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22. The function of the temperature and pressure relief valve is to discharge water in large quantities in the event of excessive temperature or pressure developing in the water heater. The valve’s relief pressure must not exceed the working pressure of the water heater as stated on the data plate. Important: Only a new temperature and pressure relief valve should be used with this water heater. Do not use an old or existing valve as it may be damaged or not adequate for the working pressure of the new water heater. Do not place any valve or piping between the relief valve and the tank. The Temperature & Pressure Relief Valve: • Must not be in contact with any electrical part. • Must be connected to an adequate discharge line. • Must not be rated higher than the working pressure shown on the data plate of the water heater. • The BTUH rating of the T & P valve must be greater than, or equal to, the input rating of the water heater The Discharge Line: • Must not be smaller than the pipe size of the relief valve or have any reducing coupling installed in the discharge line. • Must not be capped, blocked, plugged or contain any valve between the relief valve and the end of the discharge line. • Must terminate a maximum of 6 inches above a floor drain or external to the building. • Must be capable of withstanding 250°F (121°C) without distortion. • Must be installed to allow complete drainage of both the valve and discharge line. Explosion Hazard If the temperature and pressure relief valve is dripping or leaking, have a qualified service technician replace it. • Do not p...

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