24
S
PECIAL
V
ENTING
R
EQUIREMENTS
F
OR
I
NSTALLATIONS
I
N
C
ANADA
All installations in Canada must conform to the requirements
of CSAB149 code. All vent system components, including
primer and cement, must be listed to ULC S636. The certi-
fied pipe and fittings should be clearly marked with the ULC
standard “S636”. The primer and cement used must be of the
same manufacturer as the vent system. For Royal Pipe Sys-
tem 636; use GVS-65 Primer (Purple) and GVS-65 PVC
Solvent Cement. For IPEX System 636, use PVC/CPVC
Primer, Purple or clear. Use PVC Solvent Cement (Gray).
For Canadian installations, ABS may be used as a combus-
tion air pipe only. ABS is not an approved vent material in
Canada. If ABS is used as a combustion air pipe, it must be
CSA certified. Always follow the manufacturer’s instructions
in the use of primer and cement. Do not use primer and ce-
ment around potential sources of ignition. Do not use primer
or cement beyond its expiration date.
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-t
ight, 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.
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 com-
bustion air intake pipe to the air intake coupling using the rubber
coupling 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.
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
90 PVC
ELBOW
(NON-DIRECT VENT)
90 PVC
ELBOW
(NON-DIRECT VENT)
Standard Connections
OR
OR
UPFLOW COUNTERFLOW
E
DGES
OF
SHEET
METAL
HOLES
MAY
BE
SHARP
. U
SE
GLOVES
AS
A
PRECAUTION
WHEN
REMOVING
HOLE
PLUGS
.
WARNING
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
location refer to the following steps 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.
PRODUCT DESIGN
