Bradford White TW4-75S-76B-3X - Manual (Page 28)

28
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, ANS 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 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.
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 six (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 four (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.