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Temperature-Pressure Relief Valve Test
j_ • Burn hazard.
_{__ • Hot water discharge.
• Keep clear of
1-__ _ temperature-pressure
relief valve discharge.
It is recommended that the temperature-pressure
relief valve be checked to ensure it is in operating
condition at least once a year.
When checking the temperature-pressure relief
valve operation, make sure that (1) no one is
in front of or around the outlet of the T&P valve
discharge line, and (2) that water discharge will
not cause any property damage, as water may be
extremely hot. Use care when operating valve as
the valve may be hot.
To check the relief valve, lift lever at the end of
valve several times (see Figure 53). The valve
should seat properly and operate freely.
If after manually operating the valve, it fails to
completely reset and continues to release water,
immediately close the cold-water inlet to the water
heater and drain the water heater, see "Draining
and Flushing" section. Replace the T&P valve with
a properly rated/sized new one.
TEMPERATURE-PRESSURE
DISCHARGE PIPE
Figure 53
If the temperature-pressure relief valve on the water
heater weeps or discharges periodically, it may be
due to thermal expansion.
T&P valve is not intended for the constant relief of
thermal expansion.
Temperature-pressure relief valve leakage due
to pressure build up in a closed system that does
not have a thermal expansion tank installed is
not covered under the limited warranty. Thermal
expansion tanks must be installed on all closed
water systems.
Explosion Hazard
• Temperature-pressure relief
valve must comply with ANSI
Z21.22-CSA4.4 and ASME
code.
• Properly sized temperature-
pressure relief valve must be
installed in opening provided.
• Do not plug, block, or cap the
discharge line.
• Failure to follow this warning
can result in excessive tank
pressure, serious injury or
death.
Draining And Flushing
Periodic draining and cleaning of sediment from
the tank may be necessary. It is recommended that
the tank be drained and flushed every 6 months
to remove sediment which may build up during
operation. The water heater should be drained if
being shut down during freezing temperatures.
See "Typical Installation" section in this manual for
location of the water heater components described
below.
rvlmT:l( (I
• Burn hazard.
• Hot water discharge.
• Keep hands clear of drain
valve discharge.
NOTE: Excessive water pressure is the most
common cause of temperature-pressure relief
valve leakage. Excessive water system pressure
is most often caused by "thermal expansion" in a
"closed system." See "Closed Water Systems" and
"Thermal Expansion" sections of this manual. The
52
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