American Water Heater AMERICAN WATERHEATERS Installation And Use Manual page 13

Please notethefollowing:
• Thesystem shouldbeinstalled onlywithpiping thatis
suitable forpotable (drinkable) watersuchas copper,
CPVC, o r polybutylene. Thiswaterheater m ustnotbe
installed usingironpiping or PVCwaterpiping.
• Useonlypumps, v alves, o rfittings thatarecompatible
withpotable water.
• Useonlyfullflowballor gatevalves. T heuseof valves
thatmaycauseexcessive r estriction t owaterflowis
notrecommended.
• Useonly95/5tin-antimony orotherequivalent solder.
Anyleadbased solder mustnotbeused.
• Piping thathasbeentreated withchromates, boiler
seal,orotherchemicals m ustnotbeused.
• Chemicals t hatmaycontaminate t hepotable water
supply mustnotbeadded tothepiping system.
Closed System/Thermal Expansion
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.
As water is heated, it expands (thermal expansion). In
a closed system, the volume of water will grow. As the
volume of water grows, there will be a corresponding
increase in water pressure due to thermal expansion.
Thermal expansion can cause premature tank failure
(leakage). This type of failure is not covered under the
limited warranty. Thermal expansion can also cause
intermittent temperature-pressure relief valve operation:
water discharged from the valve due to excessive pressure
build up. The temperature-pressure relief valve is not
intended for the constant relief of thermal expansion. This
condition is not covered under the limited warranty.
A properly-sized thermal expansion tank should be
installed on all closed systems to control the effects of
thermal expansion. Contact a plumbing service agency or
your retail supplier regarding the installation of a thermal
expansion tank.
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