14
C
ANADIAN
V
ENTING
R
EQUIREMENTS
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.
S
TANDARD
F
URNACE
C
ONNECTIONS
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.
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 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.
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 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.
N
ON
-D
IRECT
V
ENT
I
NSTALLATIONS
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-DIRECT VENT)
90 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 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.
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.
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.
