Bradford White URG2PDV50H6N Manual page 24

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 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.
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