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3.4 Relief Valve
WARNING
Risk of Unit Damage -The pressure rating of
the relief valve must not exceed 150 PSI
(1.03 MPa), 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 remain installed in the opening provided
and marked for this 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.
The BTU/H 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 BTU/H).
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.
Temperature
Pressure Relief Valve
CAUTION
To reduce the risk of excessive pressures
and temperatures in this water heater,
install temperature and pressure protective
equipment required by local codes and no
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 for
Relief Valves and Automatic Gas Shutoff
Devices for Hot Water Supply Systems, ANSI
Z21.22. This valve must be marked with a
maximum set pressure not to exceed the
marked maximum working pressure of the
water heater. Install the valve into an
opening provided and marked for this
purpose in the water heater, and orient it or
provide tubing so that any discharge from
the valve exits only within 6 inches above,
or at any distance below, the structural
floor, and does not contact any live
electrical part. The discharge opening must
not be blocked or reduced in size under
any circumstances.
3.5 To Fill The Water Heater
WARNING
Risk of Unit Damage-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.
Ÿ
Open the shut-off valve in the cold water supply
line. Open each hot water faucet slowly to allow
the air to vent from the water heater and piping.
A steady flow of water from the hot water
Ÿ
faucet(s) indicates a full water heater.
Condensation can form on the tank and fittings
Ÿ
when it is first filled with water. Condensation
may also occur with a heavy water draw and very
cold inlet water temperature.
Installation
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