Relief Valve; To Fill The Water Heater - Rheem 72V20-1 Use And Care Manual

A new combination temperature and pressure relief valve, complying with the Standard for Relief
Valves and Automatic Gas Shut-Off Devices for Hot Water Supply Systems, ANSI Z21.22, is supplied
and must be installed in the opening provided and marked for the purpose on the water heater. No
valve of any type should be installed between the relief valve and the tank. Local codes shall govern the
installation of relief valves.
WARNING: The pressure
rating of the relief valve must
not exceed 150 PSI, the
maximum working pressure of
the water heater as marked on
the rating plate.

Relief Valve

The BTUH rating of the relief valve must
not be less than the input rating of the
water heater as indicated on the rating
label located on the front of the heater
(1 watt=3.412 BTUH).
Connect the outlet of the relief valve
to a suitable open drain so that the
discharge water cannot contact live
electrical parts or persons and to eliminate
potential water damage.

To Fill the Water Heater

WARNING: The tank must be full of
water before heater is turned on. The water
heater warranty does not cover damage or
failure resulting from operation with an
empty or partially empty tank.
Make certain the drain valve is completely
closed.
Open the shut-off valve in the cold water
supply line.
Open each hot water faucet slowly to
Condensation
Condensation can form on the tank when
it is first filled with water. Condensation
might also occur with a heavy water draw
and very cold inlet water temperature.
This condition is not unusual, and will
disappear after the water becomes heated.
If, however, the condensation continues,
examine the piping and fittings for
possible leaks.
Piping used should be of a type approved
for hot water distribution. The discharge
line must be no smaller than the outlet of
the valve and must pitch downward from
the valve to allow complete drainage (by
gravity) of the relief valve and discharge
line. The end of the discharge line should
not be threaded or concealed and should
be protected from freezing. No valve of
any type, restriction or reducer coupling
should be installed in the discharge line.
allow the air to vent from the water
heater and piping.
A steady flow of water from the hot water
faucet(s) indicates a full water heater.
Additional information on this subject
may be found at www.rheem.com under
"Library". Scroll down to the Technical
Service Bulletins 1300 Series Section and
choose Bulletin #1303.
7