12
The vent and combustion air-inlet
systems of this water heater may be
installed horizontally through a wall or
vertically through the roof
.
Maximum unsupported length is rec-
ommended to be no more than 4 feet
(1.22 m).
It is imperative that the first hanger be
located on the horizontal length imme-
diately adjacent to the first
90-degree elbow from the vertical rise
of vent pipe connected to the water
heater.
The support method used should
isolate the vent and combustion air-
inlet pipes from floor joists or other
structural members to help prevent the
transmission of noise and vibration.
Do not support, pin or otherwise secure
the vent and combustion air-inlet sys-
tems in a way that restricts the normal
thermal expansion and contraction of
the chosen venting material.
If the water heater is being installed as
a replacement for an existing power
direct vent water heater, a thorough
inspection of the existing vent and
combustion air-inlet systems must be
performed prior to any installation
work.
Verify that the correct materials as
specified in this manual have been
used, and that the minimum or maxi-
mum vent and combustion air-inlet
lengths and terminal locations as
detailed in this manual have been
met.
Carefully inspect the entire vent and
combustion air-inlet systems for any
signs of cracks or fractures, particu-
larly at the joints between elbows or
other fittings and the straight length
of vent pipe.
Check the vent and combustion air-
inlet for signs of sagging or other
stresses in the joints as a result of
misalignment of any components in
the systems.
If any of the conditions above are
found, they must be corrected in
accordance with the instructions
i
n
this manual before completing the
installation and putting the water
heater into service.
Connect the vent system piping to the
blower assembly using the already
installed 2 in. (5.1 cm) diameter rub-
ber coupling and clamps. Connect
the combustion air-inlet system pip-
ing to the combustion air-inlet piping
tee using the 2 in. (5.1 cm) already
installed rubber coupling and clamps
(See Figure 1). For vent and combus-
tion air-inlet terminals, use the two (2),
2 in. (5.1 cm) diameter, Schedule 40,
PVC, 90°, 1/4 standard bend elbows
and wire mesh screen assemblies sup-
plied with the water heater.
This water heater may also be installed
with 3 in. (7.6 cm) diameter pipe and
fittings for the vent and combustion
air-inlet systems. When using 3 in.
(7.6 cm) diameter pipe, two (2), 2 in.
(5.1 cm) to 3 in. (7.6 cm) diameter
pipe increaser fittings are required for
connection of the vent system piping to
the blower assembly and combustion
air-inlet system piping to the combus-
tion air-inlet piping tee couplings (See
Figure 2). For vent and combustion
air-inlet terminals, 3 in. (7.6 cm)
diameter, Schedule 40, PVC, 90°, 1/4
standard bend elbows (not supplied)
along with the two (2) wire mesh
screens (supplied) must be installed.
DO NOT
use unequal sizes except as
defined previously for the vent and
combustion air-inlet systems.
Maximum and Minimum Vent and Combustion Air-Inlet
Lengths for Power Direct Vent Models:
40 Gallon with Inputs of 40,000 & 38,000 BTU/Hr.
50 Gallon with Input of 40,000 BTU/Hr.
Additional installation information for The Com-
monwealth of Massachusetts is located on the
back page of this manual.
NOTICE: This unit
is equipped with a
Flammable Vapor Sensor.
Do not supply electrical
power to the water heater
until enough time has
passed to allow the vapors
from the primer and
cement to dissapate.
Vent and Combustion Air-Inlet continued -
Installing the Water Heater
Summary of Contents for Power Direct Vent Series
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