18-CD37D1-2-EN
17
Installer’s Guide
VENT FITTING MATERIAL – PLASTIC
Gas and liquid tight single wall vent fittings, designed for resis-
tance to corrosive flue condensate, MUST be used throughout.
Listed in Table 9, page 18, are designations for different types
of 2" and 3" size pipe and fittings that meet these require-
ments. The materials listed are various grades of PVC, CPVC,
ABS, and DuraVent PolyPro®.
ATTACHING VENT PIPING
Important: Products installed in Canada must use vent
systems that are certified to the Standard for Type BH
Gas Venting Systems (ULC S636) for Class II-A venting
systems (up to 65°C). Components of the vent system
must not be interchanged with other vent systems or
unlisted pipe or fittings. Plastic components, specified
primers, and glues must be from a single system
manufacturer and not intermixed with other system
manufacturer's vent system parts. In addition, the first
three feet of the vent pipe must be visible for inspection.
PIPE JOINTS: All joints must be fastened and sealed per
manufacturer instructions and local and national codes to pre-
vent escape of combustion products into the building.
MANUFACTURED MODULAR VENTING SYSTEMS
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WARNING
!
CARBON MONOXIDE POISONING HAZARD
See Table 9 for manufactured modular venting systems
that are approved for use with this product. Follow the
manufacturer's installation instructions when installing
the venting system. Failure to follow this warning may
result in property damage, severe personal injury, or
death.
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WARNING
!
CARBON MONOXIDE POISONING HAZARD
Do not use cement on polypropelene venting systems.
Follow the manufacturer's installation instructions when
installing the venting system. Failure to follow this
warning may result in property damage, severe personal
injury, or death.
For manufactured modular venting systems that are approved
with this product see Table 9. Do not drill into polypropelene
venting pipes
BONDING OF PVC
NOTE: It is recommended that the first joints from the
Furnace be connected and sealed with high temperature
RTV. This will enable the pipes to be removed later without
cutting.
Be sure to properly support these joints.
Commercially available solvent cement for PVC must be used
to join PVC pipe fittings. Follow instructions on container care-
fully.
Pipe and Fitting – ASTM D1785, D2466, D2661, & D2665
PVC Primer and Solvent Cement – ASTM D2564
Seal
VENT PIPE
with RTV sealant
Seal
INLET AIR PIPE
with RTV sealant
Front of Furnace
VENT AND INLET AIR CONNECTIONS
Figure 26
Procedure for Cementing Joints – Ref ASTM D2855
1. Cut pipe square, remove ragged edges and burrs. Cham-
fer end of pipe, then clean fitting socket and pipe joint
area of all dirt, grease, moisture or chips.
2. After checking pipe and socket for proper fit, wipe socket
and pipe with cleaner-primer. Apply a liberal coat of primer
to inside surface of socket and outside of pipe.
DO NOT ALLOW PRIMER TO DRY BEFORE APPLYING
CEMENT.
3. Apply a thin coat of cement evenly in the socket. Quickly
apply a heavy coat of cement to the pipe end and insert
pipe into fitting with a slight twisting movement until it bot-
toms out.
4. Hold the pipe in the fitting for 30 seconds to prevent ta-
pered socket from pushing the pipe out of the fitting.
5. Wipe all excess cement from the joint with a rag. Allow 15
minutes before handling. Cure time varies according to fit,
temperature and humidity.
NOTE: Follow venting instructions carefully when using
PVC cement.
IMPORTANT: All joints must be water tight. Flue
condensate is somewhat acidic, and leaks can cause
equipment damage.
Connection of the pipe and collar of the combustion air inlet
should just be a friction fit. It is recommended that the inlet air
joint be sealed with RTV type sealant to allow the joint to be
separated for possible future service. The inlet and vent pipes
must be properly supported throughout the entire length. See
Figure 26.
NOTE: For U.S. applications ONLY, vent termination kit
BAYAIR30AVENTA or BAYVENT200B may be used in
addition to the horizontal and vertical termination options.
For Canadian applications, venting systems must meet
ULC-S636 requirements.
CARBON MONOXIDE POISONING HAZARD
FAILURE TO FOLLOW THE INSTALLATION INSTRUC-
TIONS FOR THE VENTING SYSTEM BEING PLACED INTO
OPERATION COULD RESULT IN CARBON MONOXIDE
POISONING OR DEATH.
▲
WARNING
!
