Do not use excessive force (over 31.5 ft lbs.) in tightening the pipe, particularly if
pipe-tape compound is used, as the unit may be damaged.
The inlet gas pressure to the water heater must not exceed 10.5 “ w.c. for natural
or 14” w.c. for LP gas. For purposes of input adjustment, the minimum inlet gas
pressure (with main burner on) is shown on the water heater rating plate. If high
or low gas pressures are present, contact your gas supplier for correction.
Relief valve
A new pressure relief valve, complying with the Standard for relief Valves and
Automatic Gas Shut-Off Devices for Hot Water Supply Systems, ANSI Z21.22,
must be installed at the hot water outlet connection of the water heater at the time
of installation. Local codes shall govern the installation of relief valves.
For safe operation of the water heater, be sure that:
● 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.
● The BTUH rating of the relief valve must equal or exceed the BTUH input of the
water heater as marked on its rating plate.
● No valve of any type should be installed between the relief valve and the water
heater.
● Discharge from the relief valve should be piped to a suitable drain to eliminate
potential water damage. Piping used should be of a type approved for the
distribution of hot water.
● Hot and cold water lines should be insulated up to the water heater.
● The discharge line must be NO SMALLER than the outlet of the valve and must
pitch downward 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 discharge line.
NOTICE:
Local codes govern the installation of relief valves. If local codes require
that a temperature and pressure relief valve should be installed the manufacturer
recommends a type 40XL Watts T&P relief valve or an equivalent model be used.
NOTICE:
Manual operation of relief valves should be performed at least once a
year. Turn off the electrical power and gas shutoff valve. Lift and release lever on
the relief valve and check the manual operation of the relief valve. You should
take precaution to avoid contact with the hot water coming out of the relief valve
and to prevent water damage.
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