19
S
PECIAL
V
ENTING
R
EQUIREMENTS
F
OR
I
NSTALLATIONS
I
N
C
ANADA
All installations in Canada must conform to the requirements of CAN/CSA B149.1 code. All vent system components, including
primer and cement, must be listed to ULC S636. The certified 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 System
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 combustion 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 cement around potential sources of ignition. Do not use primer or cement beyond
its expiration date.
The safe operation, as defined by ULC S636, of the vent system is based on following these installation instructions, the vent
system manufacturer’s installation instructions, and proper use of primer and cement. It is recommended under this stan-
dard, that the vent system be checked once a year by qualified service personnel. All fire stops and roof flashings used with
this system must be UL listed. Acceptability under CAN/CSA B149.1 is dependent upon full compliance with all installation
instructions. Consult the authority having jurisdiction (gas inspection authority, municipal building department, fire depart-
ment, etc.) before installation to determine the need to obtain a permit.
*IPEX System 636™ is a trademark of IPEX Inc.
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.
V
ENT
P
IPE
C
ONNECTION
The vent pipe outlet is sized to accept 2” pipe. Secure vent/flue pipe directly into the furnace
fitting with the appropriate glue. Alternately, a small section of 2" pipe may be glued in the
furnace socket and a rubber coupling installed to allow removal for future service. 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 creating an
offset using two 45 degree elbows. This joint can be rotated on the fitting to establish maximum
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.
C
OMBUSTION
A
IR
P
IPE
D
IRECT
V
ENT
I
NSTALLATIONS
On
upflow
units secure the combustion air intake pipe to the air intake coupling by using a
take apart rubber coupling supplied with the furnace or a plastic coupling. Also, the
intake coupling may be inverted to allow the intake pipe to be glued directly to it. After
inverting the coupling, secure it to the furnace top with screws. On
counterflow
units
secure the combustion 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. The combustion air
intake pipe can also be secured directly to the counterflow unit air intake pipe coupling.
COMBUSTION AIR INTAKE OPTION:
The RF000142 coupling can be secured directly to the
furnace intake coupling if condensation is a concern. If the RF000142 is used on the
combustion air inlet, it must be installed with the arrow pointing up. It should be noted, the combustion air will actually be
moving in a direction opposite of the arrow on the RF000142 coupling. It must have a field supplied, trapped drain tube free-
draining to proper condensate disposal location. A loop in the drain tube can serve as a trap. The unused RF000142 drain
fitting should be capped.
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.
45 DEGREE
ELBOWS
Increased Clearance
Figure 9A
Figure 9B
VENT-DRAIN
E
DGES
OF
SHEET
METAL
HOLES
MAY
BE
SHARP
. U
SE
GLOVES
AS
A
PRECAUTION
WHEN
REMOVING
HOLE
PLUGS
.
WARNING
