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.