Bradford White UCG100H199 Installation & Operation Manual page 20

Keep clear of 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.
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.
Hydrogen gas can be produced in an operating water heater that has not had water drawn from the tank for a
long period of time (generally two weeks or more). Hydrogen gas is extremely flammable. To prevent the
possibility of injury under these conditions, we recommend the hot water faucet to be open for several
minutes at the kitchen sink before you use any electrical appliance which is connected to the hot water
system. If hydrogen is present, there will be an unusual sound such as air escaping through the pipes as hot
water begins to flow. Do not smoke or have open flame near the faucet at the time it is open.
WARNING
SCALDING
This water heater can deliver scalding temperature
water at any faucet in the system.
whenever using hot water to avoid scalding injury.
Certain appliances
automatic clothes washers may require increased
temperature water. By setting the thermostat on this
water heater to obtain the increased temperature
water required by these appliances, you may create
the potential for scald injury. To protect against injury,
you should install an ASSE approved mixing valve in
the water system.
discharge temperature by mixing cold and hot water in
branch supply lines. Such valves are available from
the manufacturer of this water heater or a local
plumbing supplier. Please consult with a plumbing
professional for installation of mixing valves.
20
Be careful
such as dishwashers
This valve will reduce point of
and