14
V
ent
/f
lue
P
IPe
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. (See Figure 8).
VENT-DRAIN
f
Igure
8
note: f
or
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
D
Irect
V
ent
I
nstallatIons
WARNING
e
Dges
of
sHeet
Metal
Holes
MaY
Be
sHarP
. u
se
gloVes
as
a
PrecautIon
wHen
reMoVIng
Hole
Plugs
.
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.
• The combustion air intake termination of a direct vent
application should not terminate in an area which is
frequently dusty or dirty.
note: I
n
c
anaDa
,
tHe
current
eDItIon
of
can/csa
B149.1-15
takes
PreceDence
oVer
tHe
PreceDIng
terMInatIon
DescrIPtIon
.
c
anaDIan
V
ent
P
IPe
& c
oMBustIon
a
Ir
P
IPe
r
equIreMents
All installations in Canada must conform to the
requirements of CAN/CSA B149.1-15 code. All vent
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 standard, 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 B149.1-15 is dependent
upon full compliance with all installation instructions.
Consult the authority having jurisdiction (gas inspection
authority, municipal building department, fire department,
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.
