14
CANADIAN VENTING REQUIREMENTS
In Canada, venting must conform to the requirements of the current
CAN/CSA-B149 Installation Code. Use only CSA listed two or three
inch diameter PVC or ABS pipe, solvent cement, and fittings through-
out. Carefully follow the pipe manufacturers’ instructions for cut-
ting, cleaning, and solvent cementing 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-resistant flashing.
STANDARD FURNACE CONNECTIONS
It is the responsibility of the installer to ensure that the piping con-
nections to the furnace are secure, airtight, and adequately sup-
ported.
As shipped, attachment “couplings” for vent/flue and combustion
air intake pipe connections are provided on the furnace’s top cover
(upflow) or basepan (counterflow). To use the standard connec-
tions, field supplied vent/flue pipe and combustion air intake pipe
(when applicable) should be secured directly to the furnace at these
locations.
VENT/FLUE PIPE
Vent/flue pipe can be secured to the vent/flue coupling using the
rubber coupling and worm gear hose clamps provided with this fur-
nace (see “Standard Connections” figure). The rubber coupling al-
lows separation of the vent/flue pipe from the furnace during servic-
ing. Combustion Air and Vent piping should be routed in a manner
to avoid contact with refrigerant lines, metering devices, conden-
sate drain lines, etc. If necessary, clearances may be increased
by utilizing two 45 deg. Long-Sweep Elbows and creating an “S”
joint to provide additional space at connection locations. This joint
can be rotated on the fitting to establish maximum clearance be-
tween refrigerant lines, metering devices, and condensate drain
lines, etc. This joint is the equivalent of one 90 deg. elbow when
considering elbow count.
Increased Clearance Configuration
NOTE: Do not use other commercially available “no hub connec-
tors” due to possible material conflicts. The vent/flue pipe can also
be secured using a PVC or ABS elbow or coupling using the appro-
priate glue (see Section IX, Materials and Joining Methods.
NOTE: For non-direct vent installations, a minimum of one 90°
elbow should be installed on the combustion air intake coupling
to guard against inadvertent blockage.
COMBUSTION AIR PIPE
DIRECT VENT INSTALLATIONS
On upflow units secure the combustion air intake pipe directly to
the air intake coupling. On counterflow units secure the combus-
tion air intake pipe to the air intake coupling using the rubber cou-
pling and worm gear hose clamps provided with the unit. The coun-
terflow rubber coupling allows service removal of air intake piping
internal to the furnace blower compartment. NOTE: Because of
probable material conflicts, do not use other commercially avail-
able “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 should be installed on the combustion
air intake “coupling” to guard against inadvertent blockage.
RUBBER
COUPLING
WITH W ORM
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-DIREC T VENT)
90 PVC
ELBOW
(NON-DIRECT VEN T)
STANDARD CONNECTIONS
OR
OR
UPFLOW COUNTERFLOW
ALTERNATE FURNACE CONNECTIONS
If the standard locations are undesirable for a specific installation,
alternate side panel locations are available for both 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 upright counterflow installations requiring
additional access to a filter or electronic air cleaner, 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.
WARNING
E
DGES OF SHEET METAL HOLES MAY BE SHARP.
U
SE GLOVES AS A PRE-
CAUTION WHEN REMOVING HOLE PLUGS.
ALTERNATE VENT/FLUE LOCATION
The alternate vent/flue location is the large hole directly in line with
the induced draft blower outlet. To use the alternate vent/flue loca-
tion refer to the following steps, the “Vent/Flue Pipe Cuts” figure,
and the “Alternate Vent/Flue Location” figure.
NOTE: Counterflow instructions follow the upflow instructions.
1. Remove and save the four screws securing the vent/flue
coupling to the furnace top panel.
Counterflow units.
Remove and save the four screws securing the vent/flue
coupling to the furnace basepan. Also remove the three
screws securing the furnace’s internal vent/flue piping to the
blower deck.
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