Installation / Operation Instruction Manual

12
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.