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TEMPERATURE AND PRESSURE RELIEF VALVE—
WARNING
Keep clear of the combination temperature and pressure
relief valve discharge line outlet. The discharge may be hot
enough to cause scald injury. The water is under pressure and may
splash.
For protection against excessive temperatures and pressure, install
temperature and pressure protective equipment required by local
codes, but not less than a combination temperature and pressure
relief valve certified by a nationally recognized testing laboratory
that maintains periodic inspection of production of listed equipment
or materials as meeting the requirements of the Standard for Relief
Valves and Automatic Gas Shutoff Devices for Hot Water
Supply Systems, ANSI Z21.22 and the Standard CAN1-4.4
Temperature, Pressure, Temperature and Pressure Relief
Valves and Vacuum Relief Valves. The combination temperature
and pressure relief valve must be marked with a maximum set
pressure not to exceed the maximum working pressure of the water
heater. The combination temperature and pressure relief valve
must also have an hourly rated temperature steam BTU discharge
capacity not less than the hourly rating of the water heater. The
supplied combination temperature and pressure relief valve, when
properly installed and unrestricted, will discharge the maximum input
produced by a 240°F (116°C) boiler supply temperature. A lower
boiler supply temperature will reduce the input required to be
discharged in the event of excessive potable water temperatures.
Install the combination temperature and pressure relief valve into
the opening provided and marked for this purpose on the water
heater.
Some models may already be equipped or supplied with a
temperature and pressure relief valve. Verify that the combination
temperature and pressure relief valve complies with local codes. If
the temperature and pressure relief valve does not comply with local
codes, replace it with one that does.
INTERNET VERSION FOR REFERENCE ONLY