Temperature And Pressure Relief Valve - Lochinvar WATER HEATERS Installation & Operation Manual

3. After installation of the water lines, open the main water supply valve and fill the water heater. While
the water heater is filling, open several hot water faucets to allow air to escape from the water system.
When steady streams of water flow through the faucets, close them and check all water connections for
possible leaks.
4. NEVER OPERATE THE WATER HEATER WITHOUT FIRST BEING CERTAIN THAT IT IS FILLED
WITH WATER.

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 200°F (93°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.
WARNING
Install a discharge line so that water discharged from the temperature and pressure relief valve will exit
within six (6) inches above, or any distance below, the structural floor and cannot contact any live
electrical part. The discharge line is to be installed to allow for complete drainage of both the temperature
and pressure relief valve and the discharge line. The discharge opening must not be subjected to
blockage or freezing. DO NOT thread, plug, or cap the discharge line. It is recommended that a minimum
clearance of four (4) inches be provided on the side of the water heater for servicing and maintenance of
the combination temperature and pressure relief valve. Do not place a valve between the combination
temperature and pressure relief valve and the tank!
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