7
!
WARNING: The pressure
rating of the relief valve must
not exceed 150 PSI, (1034
KPA), the maximum working
pressure of the water heater as
marked on the rating plate.
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.
Temperature and Pressure 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.
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.
Vacuum Relief Valve
NOTICE: Do NOT remove
or tamper with the vacuum
relief valve for any reason.
Doing so will void the
manufacturer’s warranty.
The vacuum relief valve, which must be
used when installing the water heater, is
factory installed.
The cold water inlet has a vacuum relief
valve connected to it. Certain conditions
in the field may produce a vacuum or neg-
ative pressure condition inside the water
heater’s tank. This negative pressure can
cause the tank to fail. The vacuum relief
valve provides a means to eliminate the
negative pressure or vacuum by admitting
air into the tank to equalize the pressure.
It is not recommended to pull a vacuum on
the unit.
If a vacuum is pulled on the unit, refer
to the "To Fill the Water Heater" section
to ensure the unit is full of water before
operating.
