14
C
ANADIAN
V
ENTING
R
EQUIREMENTS
In Canada, venting must conform to the requirements of the cur-
rent CAN/CSA-B149 Installation Code. Use only CSA listed two or
three inch diameter PVC or ABS pipe, solvent cement, and fittings
throughout. Carefully follow the pipe manufacturers’ instructions
for cutting, 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.
S
TANDARD
F
URNACE
C
ONNECTIONS
It is the responsibility of the installer to ensure that the piping
connections to the furnace are secure, airtight, and adequately
supported.
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.
V
ENT
/F
LUE
P
IPE
Vent/flue pipe can be secured to the vent/flue coupling using the
rubber coupling and worm gear hose clamps provided with this
furnace (see “Standard Connections” figure). The rubber coupling
allows separation of the vent/flue pipe from the furnace during
servicing. Combustion Air and Vent piping should be routed in a
manner to avoid contact with refrigerant lines, metering devices,
condensate drain lines, etc. If necessary, clearances may be
increased by utilizing two 45 deg. Long-Sweep Elbows and creat-
ing an “S” joint to provide additional space at connection loca-
tions. This joint can be rotated on the fitting to establish maxi-
mum clearance between refrigerant lines, metering devices, and
condensate drain lines, etc. This joint is the equivalent of one 90
deg. elbow when considering elbow count.
45 DEGREE
LONG-SWEEP
ELBOWS
V
E
N
T
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
appropriate 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.
C
OMBUSTION
A
IR
P
IPE
D
IRECT
V
ENT
I
NSTALLATIONS
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
counterflow rubber coupling allows service removal of air intake
piping internal to the furnace blower compartment.
NOTE:
Be-
cause of probable material conflicts, do not use other commer-
cially available “no hub connectors”. The combustion air intake
pipe can also be secured directly to the counterflow unit air intake
pipe coupling.
N
ON
-D
IRECT
V
ENT
I
NSTALLATIONS
A minimum of one 90° elbow should be installed on the combus-
tion 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
90º PVC
ELBOW
(NON-DIRECT VENT)
90º PVC
ELBOW
(NON-DIRECT VENT)
STANDARD CONNECTIONS
OR
OR
UPFLOW COUNTERFLOW
A
LTERNATE
F
URNACE
C
ONNECTIONS
If the standard locations are undesirable for a specific installation,
alternate side panel locations are available on the upflow models
for the vent/flue. Counterflow furnaces include provisions for both
alternate vent/flue and combustion air piping. These locations may
be of particular benefit to upright upflow installations requiring
additional access to an A coil, or to upright counterflow installa-
tions requiring additional access to a filter or electronic air cleaner,
or to horizontal installations desiring vent/flue (upflow and coun-
terflow) and combustion air intake (counterflow only) 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), if needed.
WARNING
E
DGES OF SHEET METAL HOLES MAY BE SHARP.
U
SE GLOVES AS A PRE-
CAUTION WHEN REMOVING HOLE PLUGS.
A
LTERNATE
V
ENT
/F
LUE
L
OCATION
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.
