14
Installation (Water Connections) continued-
WARNING
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 or the Standard CAN1-4.4. Temperature and
Pressure
and the Standard
CAN1-4.4, Temperature, Pressure,
Temperature and Pressure Relief Valves and Vacuum Relief Valves
.
The combination temperature and pressure relief valve shall 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 shall also have an hourly rated temperature
steam BTU discharge capacity not less than the hourly rating of the
water heater.
Install the combination temperature and pressure relief valve into the
opening provided and marked for this purpose on the water heater.
Note: Some models may already be equipped or supplied with a
combination temperature and pressure relief valve. Verify that the
combination temperature and pressure relief valve complies with
local codes. If the combination temperature and pressure relief
valve does not comply with local codes, replace it with one that
does. Follow the installation instructions above on this page.
Install a discharge line so that water discharged from the
combination temperature and pressure relief valve will exit within 6
inches
(15.2 cm)
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 combination
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 4 inches
(10.2 cm)
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.
