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Relief Valve
Warning
Risk of Unit Damage - The pressure rating of the relief valve must not exceed
the marked hydrostatic working pressure of the water heater
(150 psi=1,034.21 kPa) as marked on the rating plate.
A new combination temperature and pressure-relief valve, complying with the
Standard for Relief Valves and Automatic Gas Shut-Off Devices for Hot Water
Supply Systems, ANSI Z21.22, is supplied and must remain installed in the
opening provided and marked for this purpose on the water heater. No valve of
any type should be installed between the relief valve and the tank. Local codes
shall govern the installation of relief valves.
The BTUH rating of the relief valve must not be less than the input rating of the
water heater as indicated on the rating label located on the front of the
heater(1 watt=3.412 BTUH).
Connect the outlet of the relief valve to a suitable open drain so that the
discharge water cannot contact live electrical parts or persons and to eliminate
potential water damage.
Piping used should be of a type approved for hot water distribution. The
discharge line must be no smaller than the outlet of the valve and must pitch
downward from the valve to allow complete drainage (by gravity) of the relief
valve and discharge line. The end of the discharge line should not be threaded
or concealed and should be protected from freezing. No valve of any type,
restriction or reducer coupling should be installed in the discharge line.
1 (844) 334-4203
www.thermomate.com
17
Temperature &
pressure relief valve
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