Figure 15: Typical
*100 Gallon Model Shown. |
Tempering Valve Installation
A tempering valve has been provided for use with the Polaris® Gas water heater and must be installed, per the manufacturer’s instructions, in the domestic hot water line. See Figure 16 for a sample tempering valve installation.
General Information
Water piping, fittings, and valves must be properly installed for the correct and safe operation of this water heater. Please note the following:
•The system should be installed only with piping that is suitable for potable (drinking) water such as copper, CPVC, or polybutylene. PVC water piping may be used on the cold water inlet supply but not within 18 inches of the cold water connection on the water heater.
•Do not use PVC piping on the hot water outlet, space heating supply, or space heating return.
•Do not use any pumps, valves, or fittings that are not compatible with potable water.
•Do not use valves that may cause excessive restriction to water flow. Use full flow ball or gate valves only.
•Do not use 50/50
•Do not tamper with the thermostat, gas valve, blower, electrical components, or temperature and pressure relief valve. Tampering with any of the components is dangerous and can result in death, severe injury, or property damage. Tampering voids all warranties. Only qualified technicians should service these components.
•Do not use this water heater as a replacement for an existing boiler installation.
•Do not use with piping that has been treated with chromates, boiler seal, or other chemicals.
•Do not add any chemicals to the system piping which will contaminate the potable water supply.
Closed System/Thermal Expansion
When a backflow prevention device or check valve is installed, it can create a “Closed System.” Heating water in a closed system causes normal thermal expansion and increases pressure in the water system. When this pres- sure reaches 150 psi, it triggers the safety system in the T
&P Relief Valve. This can result in the relief valve releas- ing water during every cycle. The rapid and repeated expansion and contraction of the water heater components and the system piping can cause premature failure of the relief valve, as well as the water heater itself. Replacing the relief valve will not correct the problem.
If the water heater is installed in a closed water supply sys- tem, such as one having a backflow preventer in the cold water supply line, means shall be provided to control ther- mal expansion. Contact the water supplier or local plumb- ing inspector on how to control this situation.
A properly sized expansion tank must be installed to pre- vent 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 figure 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 chro- mates, boiler seal or other chemicals and do not add any chemicals to the water heater piping.
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