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Whirlpool 12307 Installation Instructions And Use And Care Manual page 13

Gas water heater with the flame lock safety system
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Please note the following:
The system should be installed only with piping that is
suitable for potable (drinkable) water such as copper,
CPVC, or polybutylene. This water heater must not be
installed using iron piping or PVC water piping.
Use only pumps, valves, or fittings that are compatible
with potable water.
Use only full flow ball or gate valves. The use of valves
that may cause excessive restriction to water flow is
not recommended.
Use only 95/5 tin-antimony or other equivalent solder.
Any lead based solder must not be used.
Piping that has been treated with chromates, boiler
seal, or other chemicals must not be used.
Chemicals that may contaminate the potable water
supply must not be added to the piping system.
Closed System/Thermal Expansion
WARNING
Explosion Hazard
If the temperature and pressure relief valve
is dripping or leaking, have a qualified
person replace it.
Examples of a qualified person include:
licensed plumbers, authorized gas company
personnel, and authorized service
personnel.
Do not plug valve.
Do not remove valve.
Failure to follow these instructions can
result in death, or explosion.
Periodic discharge of the temperature and pressure relief
valve may be due to thermal expansion in a closed water
supply system. The water utility supply meter may contain a
check valve, backflow preventer or water pressure reducing
valve. This will create a closed water system. During
the heating cycle of the water heater, the water expands
causing pressure inside the water heater to increase. This
may cause the temperature and pressure relief valve to
discharge small quantities of hot water. To prevent this, it
is recommended that a diaphragm-type expansion tank
(suitable for potable water) be installed on the cold water
supply line. The expansion tank must have a minimum
capacity of 1.5 U.S. gallons for every 50 gallons of stored
water. Contact the local water supplier or plumbing
inspector for information on other methods to control this
situation.
IMPORTANT: Do not plug or remove the temperature and
pressure relief valve.
13

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