Installation / Operation Instruction Manual

11
General Information continued-
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
(115°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.