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7. VENTING —
NOTE: This unit can be vented either as a Direct
Vent or Power Vent configuration.
NOTICE: This unit can be vented using only the follow-
ing recommended pipe material. Use only 4 or 6-inch
diameter pipe.
Refer to local codes for restrictions on the use of PVC,
CPVC or ABS pipe and fittings. All exhaust venting ma-
terials for product installed in Canada must meet ULC-
S636.
PVC (Schedule 40, ASTM D-1785)
CPVC (Schedule 40, ASTM F-441)
ABS (Schedule 40, ASTM D-2661)(Not permitted in
Canada)
PVC Cellular Core (Schedule 40, ASTM F-891)(Not
Permitted in Canada)
The fittings, other than the VENT TERMINAL,
should be equivalent to the following:
PVC (Schedule 40 DWV, ASTM D-2665)
CPVC (Schedule 40 DWV, ASTM F-438)
ABS (Schedule 40 DWV, ASTM D-2661)(Not permitted
in Canada)
The unit may be vented horizontally through a wall
or vertically through the roof. Pipe runs must be ad-
equately supported along both vertical and horizontal
runs. Maximum unsupported span is recommended
to be no more than 3 feet. It is imperative that the first
hanger be located on the horizontal run immediately
adjacent to the first 90° elbow from the vertical rise or
at the blower outlet in the case of a horizontal blower
position. Support method used should isolate the vent
pipe from floor joists or other structural members to
help prevent the transmission of noise and vibration.
DO NOT support, pin or otherwise secure the venting
system in a way that restricts the normal thermal ex-
pansion and contraction of the chosen venting mate-
rial.
If the water heater is being installed as a replacement
for an existing power vented water heater, a thorough
inspection of the existing venting system must be per-
formed prior to any installation work. Verify that the
correct materials, as detailed above have been used,
and that the minimum or maximum vent length and
terminal locations as detailed in this manual have been
met. Carefully inspect the entire venting system for any
signs of cracks or fractures, particularly at the joints
between elbows or other fittings and the straight runs
of vent pipe. Check the system for signs of sagging
or other stresses in the joints as a result of misalign-
ment of any components in the system. If any of these
conditions are found, they must be corrected in accor-
dance with the venting instructions in this manual be-
fore completing the installation and putting the water
heater into service.
Failure to properly vent the water heater to the
outdoors as outlined above and in the following
section can result in unsafe operation of the water
heater causing bodily injury, explosion, fire or
death.
4" Pipe (Factory Installed)
4"x6" Increaser
(Field Supplied)
Air Intake
Figure: 7
Installation
4"x6" Increaser
(Field Supplied)
4" Pipe
4"x3" Reducer
(Field Supplied)
(Field Supplied)
Exhaust Vent
VENT PIPE CONNECTION —
Refer to Figure 7, for connecting 6" vent pipe to the
water heater.
NOTICE: If the unit is installed as a Power Vent
water heater, the vent terminal with screen must
still be installed on the inlet air side.
Before starting the vent installation, careful planning
should be given to the routing and termination of the
vent pipes. The length of the vent pipes (inlet and
outlet) should be kept to a minimum. Also, see Figure
10 for vent terminal placement. Refer to the venting
charts on Table 4 & 5, for the pipe sizes that can be
used and the total equivalent length of pipe that can
be used. DO NOT exceed equivalent length of pipe in
charts.
Depending on the size of pipe that is chosen for
venting the water heater, it might be necessary to
use a fitting for stepping up or down in pipe size, to
connect to the water heater. If another size of pipe
is used for venting the unit, the proper vent terminal
must be installed.
When the unit is vented as a Power Direct Vent ,
though a side wall, the vent terminals must be on the
same exterior wall mounted horizontally and at least
twenty-four (24) inches apart (on center). See Figure
17 for other vent terminal restrictions.
JOINING PIPES AND FITTINGS – All pipe, fittings,
solvent cement, primers and procedures, for the U.S.,
must conform to American National Standards Insti-
tute and American Society for Testing and Materials
(ANSI/ASTM) standards. For Canada, all pipe, fittings,
solvent cement, primers and procedures must con-
form to ULC-S636 and vent manufacture specifica-
tions.
CEMENTING JOINTS – All joints in the vent piping
must be properly sealed and we recommend using
the following material:
PVC materials should use ASTM D-2564 grade ce-
ment.
CPVC materials should use ASTM F-493 grade ce-
ment.
ABS materials should use ASTM D-2235 grade ce-
ment.
(ABS is not allowed in Canada)
Cleaner-Primer and Medium Body Solvent Cement
1. Cut pipe end square, remove jagged edges and
burrs. Chamfer end of pipe, then clean fitting socket
and pipe joint area of all dirt, grease or moisture.
2. After checking pipe and socket for proper fit, wipe
socket primer to inside surface of socket and outside
of pipe. DO NOT allow primer to dry before applying
cement.
3. Apply a thin coat of cement evenly in the socket.
Quickly apply a heavy coat of cement to the pipe end
and insert pipe into fitting with a slight twisting mo-
tion until it bottoms out.
NOTICE: Cement must be fluid; if not, re-coat.
4. Hold the pipe fitting for 30 seconds to prevent the ta-
pered socket from pushing the pipe out of the fitting.
5. Wipe all excess cement from the joint with a rag.
Allow 15 minutes before handling. Cure time will vary
according to fit, temperature and humidity.
11
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