PRODUCT DESIGN
43
Canadian Venting Requirements (90% Furnaces Only)
In Canada, venting must conform to the requirements of the
current CAN/CGA-B149 Installation Code. Use only CSA
listed two or three inch diameter PVC or ABS pipe, solvent
cement, and fittings throughout. Carefully follow the manu-
facturers’ instructions for cutting, cleaning, and solvent ce-
menting PVC and/or ABS.
The vent can be run through an existing unused chimney
provided the space between the vent pipe and the chimney
is insulated and closed with a weather-tight, corrosion-re-
sistant flashing.
The vent shall not be located:
• Less than 12 inches above the finished grade line.
• Less than 36 inches from any building opening or any
gas service regulator. For gas service regulators in
the Province of Ontario, 72 inches.
• Less than 72 inches from the combustion air intake of
another appliance.
• Directly above a gas utility meter or service regulator.
• Over a walkway unless located 84 inches above grade.
Standard Furnace Connections (90% Furnaces Only)
It is the responsibility of the installer to ensure that the pip-
ing connections to the furnace are secure, airtight, and ad-
equately supported.
As shipped, attachment "couplings" for vent/flue and com-
bustion air intake pipe connections are provided on the
furnace’s top cover (upflow). To use the standard connec-
tions, field supplied vent/flue pipe and combustion air intake
pipe (when applicable) should be secured directly to the fur-
nace at these locations.
Vent/Flue Pipe (90% Furnaces Only)
Vent/flue pipe can be secured to the vent/flue coupling us-
ing the rubber coupling and worm gear hose clamps pro-
vided with this furnace. Torque hose clamps to 20 inch-lbs
(see "Standard Connections" figure). The rubber coupling
allows separation of the vent/flue pipe from the furnace dur-
ing servicing. NOTE: Do not use other commercially avail-
able "no hub connectors" due to possible material conflicts.
The vent/flue pipe can also be secured using a PVC or ABS
elbow or coupling using the appropriate glue (see Materials
and Joining Methods section in this manual or the installa-
tion instructions for further details).
NOTE: For non-direct vent installations, a minimum of one
90° elbow must be installed on the combustion air intake
coupling to guard against inadvertent blockage.
Combustion Air Pipe (90% Furnaces Only)
Direct Vent Installations
On upflow units secure the combustion air intake pipe di-
rectly to the air intake coupling. On counterflow units se-
cure the combustion air intake pipe to the air intake cou-
pling using the rubber coupling and worm gear hose clamps
provided with the unit. The counterflow rubber coupling al-
lows service removal of air intake piping internal to the fur-
nace blower compartment. NOTE: Because of probable ma-
terial conflicts, do not use other commercially available “no
hub connectors”. The combustion air intake pipe can also
be secured directly to the counterflow unit air intake pipe
coupling.
Non-Direct Vent Installations
A minimum of one 90° elbow must be installed on the com-
bustion air intake “coupling” to guard against inadvertent
blockage.
RUBBER
COUPLING
WITH WORM
GEAR CLAMPS
RUBBER
COUPLINGS
WITH WORM
GEAR CLAMPS
COMBUSTION
AIR PIPE
(DIRECT VENT ONLY)
COMBUSTION
AIR PIPE
(DIRECT VENT ONLY)
VENT/FLUE
PIPE
VENT/FLUE
PIPE
90 PVC
ELBOW
(NON-DIRECT VENT)
90 PVC
ELBOW
(NON-DIRECT VENT)
OR
OR
UPFLOW COUNTERFLOW
90% Furnace Vent/Flue & Combustion Air
Standard Connections
Alternate Furnace Connections (90% Furnaces Only)
NOTE: Alternate combustion fresh air inlet location on the
right hand panel side of 90% furance models was discontin-
ued since November 2005).
If the standard locations are undesirable for a specific instal-
lation, alternate side panel locations are available for both
alternate combustion air inlet and vent/flue pipe connections.
These locations may be of particular benefit to upright upflow
installations requiring additional access to an A coil or to
horizontal installations desiring vent/flue (and combustion
air intake) piping run vertically from the side of the cabinet.
NOTE: Standard and alternate locations can be combined
(i.e., an installation may use the standard combustion air
intake location but use the alternate vent/flue location or
vice versa), if needed.
CAUTION
E
DGES OF SHEET METAL HOLES MAY BE SHARP.
U
SE GLOVES A PRECAUTION
WHEN REMOVING HOLE PLUGS.
The alternate vent/flue location is the large hole directly in
line with the induced draft blower outlet. Refer to the follow-
ing “Alternate Vent/Flue Location” figure for details.
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