Install Instructions

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EXHAUST VENTING
This heater is designed to exhaust the products of
combustion (fl ue gases) to the outdoors using a sealed
piping system. Table 2 lists the allowable vent materials
and sizing information. Figure 34 shows the general venting
layout while Figures 38-42 show various end termination
details and clearances. Connection of the venting piping
to the blower is shown in Figures 38-42.
Correct installation of the venting system is essential to
the safe and effi cient operation of this water heater. Vent
piping must be installed in accordance with all applicable
codes. All installations shall meet the requirements as
stated in the current edition of the “National Fuel Gas
Code, ANSI Z223.1/NFPA 54”.
Note: The information provided in Figure 29 is intended
as a guideline for good vent installation practices only
and is not intended to restrict venting options beyond
those restrictions established by the current edition of the
“National Fuel Gas Code, ANSI Z223.1/NFPA 54” or any
applicable local and state codes.
6 in.
(150mm)
min.
BACK TO BACK ELBOWS
NORMAL ELBOW
90° LONG SWEEP ELBOW
(LESS RESTRICTIVE)
90° SHORT SWEEP ELBOW
(MORE RESTRICTIVE)
STREET ELBOW
PREFERRED PRACTICE
Figure 31
Important Notes and Warnings
This heater is certifi ed to be installed using PVC, CPVC,
ABS or polypropylene plastic vent material. Only use
approved material. All venting material and components
must be joined with the approved primer/cleaner and
solvent cement.
Do not common vent this heater with any other
appliance.
During operation the plastic piping will expand as it
heats up and contract as it cools down. This is normal
for this type of venting. Rigidly fastening the vent piping
can cause undue stress that may result in the cracking
or fracturing the vent piping material. A fracture of
the venting pipe may pose a serious safety hazard.
To prevent stressing of the vent system, all hangers
and supports must allow the vent piping freedom to
move.
Use long sweep elbows wherever possible. Closely-
coupled elbows and short radius elbows can reduce
the venting capacity.
All power vented water heaters generate a certain
amount of operational noise. In order to minimize noise
transmission to the support structure, use isolation pads
between the pipe hangers and the vent pipe.
Most power vent installations develop some
condensation in the vent piping. When using long runs
of venting or when the venting passes through cold or
unheated areas, considerable amounts of condensate
from the fl ue gases can develop. Provision must be
made for the condensate to drain freely from the
system or to be collected in a condensate trap(s) that
can be drained. Damage or fracture of the vent piping
may occur if the condensate is allowed to collect and
freeze. Pooling of condensate can restrict airfl ow and
can cause nuisance failures of the system.
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