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Installation
Instructions
LOCATION (CONT.)
Catch Pan Installation
/
Routeto opendrain.Line
shouldbe at least 3/4'"
(1.g cm) ID and pitched
for properdrainage.
A--Diameter of water heater
plus2" (5.1cm)min.
B--Maximum 2" (5.1cm)
NOTE: A uxiliary catch pan lUST conform to local codes.
Catch Pan Kits are availablefrom the store where the water
heaterwas purchased,a builder store or any water heater
distributor.
Required clearances:
Theremust be a 7" (17.5cm) clearance between any object
and the Front and Rearcovers in the event serviceis needed.
A minimum of 7" (17.5cm) clearance with the sides of the
water heater is also recommendedfor serviceaccess.
X'
(17.5cm)
A 6"(152.4cm)minimum clearance is required to remove the
filter for cleaning.The hot and cold water plumbing and
electrical connections must not interfere with the removal of
the filter.
....
..........
I 6"(152.4cm)
Condensotion droin
The unit hasa condensatedrain;therefore a drain must be
available in close proximity to the unit. The drain must be no
higher than 36" (91.4cm) above the floor (drain must meet
state and local codes).
If no drain is available,then a common condensatepump with
a capacity no less than 1 gallon (3.8L)/day must be purchased
from a local builder supply store and installed.
MATERIALS
NEEDED
FOR INSTALLATION
1/2" Rigid PVC
droin pipe
(os required)
1/2"MNPT PVC
Connector
V2"PVC Tee
Wire nuts
O
PVCGlue
THERMAL EXPANSION
Determine if o check volve exists in the inlet woter
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 woter 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 "thermol exponsion." 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 woter system," however, prevents the
expanding water from flowing back into the main
supply line, and the result of "thermol exponsion" 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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