440 01 4300 00 45
Specifications subject to change without notice.
piping and vent piping a minimum of every 5 ft. (1.5M) [3
ft. (.91M) for SDR−21 or −26 PVC] using perforated
metal hanging strap or commercially available hangars
designed to support plastic pipe.
17. Prevent condensate from accumulating in the pipes by
sloping the combustion air piping and vent piping
downward towards furnace a minimum of 1/4-in. per
linear ft. with no sags between hangers.
18. Complete the vent and combustion air pipe installation
by connecting to the concentric vent or by installing the
required termination elbows as shown in Figure 46,
Figure 47, Figure 55 and Figure 56. For ventilated
combustion air terminations, see Figure 48.
19. Use appropriate methods to seal openings where
combustion air pipe and vent pipe pass through roof or
sidewall.
!
WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury or
death.
DO NOT use cement to join polypropylene venting systems.
Follow the polypropylene venting system manufacturer’s
instructions for installing polypropylene venting systems.
Optional Installation of the vent pipe
NOTE: DO NOT USE THIS TECHNIQUE FOR
POLYPROPYLENE VENTING SYSTEMS.
This option provides a disconnect point for the vent pipe. The
vent pipe must be cemented to the plastic vent pipe adapter to
maintain a sealed vestibule. See Figure 42 and Figure 43
1. Insert a length of vent pipe through the casing into the
outlet of the vent elbow.
2. Slide the plastic vent pipe adapter over the length of the
vent pipe down to the furnace casing. Mark the pipe
where it is flush with the outlet of the adapter.
3. Remove the pipe from the furnace and the adapter and
cut off any excess pipe.
4. Clean and prime the end of the pipe that is flush with the
vent adapter with a primer that is appropriate for the type
of pipe being used.
5. Re−insert the pipe through the casing into the vent
elbow.
6. Tighten the clamp around the outlet of the vent elbow.
Torque the clamp to 15 lb−in.
7. Apply cement to the end of the pipe and to the inside of
the plastic vent adapter.
8. Slide the adapter over the vent pipe and align the screw
holes in the adapter with the dimples in the furnace
casing.
9. Pilot drill 1/8−in. screw holes for the adapter in the casing
and secure the adapter to the furnace with sheet metal
screws.
10. Loosen the clamps on the rubber vent coupling.
11. Slide the end of the coupling with notches in it over the
standoffs in the vent pipe adapter.
12. Tighten the clamp of the coupling over the vent pipe
adapter. Torque the lower clamp around the vent pipe
adapter to 15 lb−in.
13. Pilot drill a 1/8−in. hole in the combustion air pipe
adapter.
14. Complete the vent and combustion air pipe as shown in
“Install the Vent and Combustion Air Pipe”
NOTICE
FOR POLYPROPYLENE VENTING SYSTEMS
When using polypropylene venting systems, all venting ma-
terials used, including the vent terminations, must be from the
same manufacturer.
Installing the Vent Termination
Roof Terminations
A roof termination of any type will require a 4-in. (102 mm)
flashing for a 2−in. (50 mm ND) concentric vent or a 5−in. (127
mm) diameter flashing for a 3-in. (80 mm ND) concentric vent
kit. For 2-pipe or single pipe vent systems, a flashing for each
pipe of the required diameter will be necessary.
It is recommended that the flashing be installed by a roofer or
competent professional prior to installing the concentric vent.
The terminations can be installed on a flat or pitched roof.
Concentric Vent
Single or multiple concentric vent must be installed as shown in
Figure 47. Maintain the required separation distance between
vents or pairs of vents as shown in Figure 47 and all
clearance shown in Figure 57.
NOTE: Follow the instructions of the vent terminal
manufacturer. These instructions are provided as a reference
only.
Cut one 4−in. (102 mm) diameter hole for 2−in. (50 mm ND) kit,
or one 5−in. (127 mm) diameter hole for 3−in. (80 mm ND) kit in
the desired location.
Loosely assemble concentric vent/combustion air termination
components together using instructions in kit.
Slide assembled kit with rain shield REMOVED through hole in
wall or roof flashing.
NOTE: Do not allow insulation or other materials to accumulate
inside of pipe assembly when installing it through hole.
Disassemble loose pipe fittings. Clean and cement using same
procedures as used for system piping. DO NOT CEMENT
POLYPROPYLENE FITTINGS.
Two−Pipe (Direct Vent)Terminations
Two pipe vent terminals must be installed as shown in
Figure 47 and Figure 48. Maintain the required separation
distance between vents or pairs of vents as shown in
Figure 47 and Figure 48 and all clearance shown in Figure 57
or Figure 58.
NOTICE
RECOMMENDED SUPPORT FOR VENT TERMINATIONS
It is recommended that rooftop vent terminations in excess of
36 inches (1.0 M) in vertical length be supported by EITHER the
Direct Vent Termination Kit shown in Table 12 or by
field-supplied brackets or supports fastened to the structure.
Cut the required number of holes in the roof or sidewall for vent
and combustion air pipes. Sidewall holes for 2-pipe vent
terminations should be side-by-side, allowing space between
the pipes for the elbows to fit on the pipes.
Holes in the roof for direct−vent (two−pipe) terminations should
be spaced no more than 18−in. (457 mm) apart to help avoid
vent gas recirculation into combustion air intake.
Termination elbows will be installed after the vent and (if used)
combustion air pipe is installed.
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