Manual

Installation Instructions
LOCATION (CONT.)
Required clearances:
There mustbe a 7" (17.5cm)clearancebetweenany object
and the Frontand Rearcovers in the eventserviceis needed.
A minimum of 7"(17.5cm)clearancewith the sidesof the
water heater isalso recommendedfor serviceaccess.
A 6"(152.4cm)minimumclearanceis requiredto removethe
filter for cleaning.Thehot and coldwater plumbing and
electricalconnectionsmust not interferewith the removalof
the filter.
Catch Pan Installation (If required)
Relief Valve Drain
Drain
Catch Pan
Catch Pan
Drain
NOTE:Auxiliarycatch pan MUSTconform to local codes.
Catch PanKitsare availablefrom the storewhere the water
heater was purchased,a builderstore or any water heater
distributor.Thecatch pan should be2" (51 cm)minimum
largerthan the Water Heaterbase diameter. Toprevent
corrosionand improve DrainValveaccessit is recommended
that the water heater be placedon spacersinsidethe catch
pan.
Condensation drain
The unit hasa condensatedrain;therefore a drain must be
availablein closeproximityto the unit.Thedrain must be no
higherthan 36" (91./4cm)above the floor (drain must meet
state and local codes),tf nodrain is available,then a common
condensatepump with a capacity no lessthan i gallon (3.8L)/
day must be purchasedfrom a local buildersupply storeand
installed.
NONSTANDARD PARTS NEEDED:
1 - 3/8" x 6' Flexible Tubing
1 - 3/8" x 3/8" x 1/2" NPTMale Barbed Tee
(supplied on some models)
THERMAL EXPANSION
Determine if a check valve exists in the inlet water
line. It may have been installed in the cold water line as
a separate backflow preventer, or it may be part of a
pressure-reducing valve, water meter or water softener.
A check valve located in the cold water inlet line can
cause what is referred to as a "closed water system."
A cold water inlet line with no check valve or backflow
prevention device is referred to as an "open" water
system.
As water is heated, it expands in volume and creates
an increase in the pressure within the water system.
This action is referred to as "thermal expansion." In an
"open" water system, expanding water which exceeds the
capacity of the water heater flows back into the city main
where the pressure is easily dissipated.
A "closed water system," however, prevents the
expanding water from flowing back into the main
supply line, and the result of "thermal expansion" can
create a rapid and dangerous pressure increase in the
water heater and system piping. This rapid pressure
increase can quickly reach the safety setting of the relief
valve, causing it to operate during each heating cycle.
Thermal expansion, and the resulting rapid and repeated
expansion and contraction of components in the water
heater and piping system, can cause premature failure of
the relief valve, and possibly the heater itself. Replacing
the relief valve will not correct the problem!
The suggested method of controlling thermal expansion
is to install an expansion tank in the cold water line
between the water heater and the check valve (refer
to the illustration on page 15).The expansion tank is
designed with an air cushion built in that compresses
as the system pressure increases, thereby relieving the
over-pressure condition and eliminating the repeated
operation of the relief valve. Other methods of controlling
thermal expansion are also available. Contact your
installing contractor, water supplier or plumbing inspector
for additional information regarding this subject.
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