International comfort products R9MSB0801716 Installation Instructions Manual page 46

INSTALLATION INSTRUCTIONS
3. Pilot drill the screw holes for the adapter in the casing
and attach the vent pipe adapter to the furnace with
sheet metal screws
4. Slide the end of the rubber vent coupling with notches in
it over the standoffs on the vent pipe adapter.
5. Insert a length of vent pipe through the coupling into the
outlet of the vent elbow.
6. Tighten the clamp around the outlet of the vent elbow.
Torque the clamp to 15 lb−in.
NOTICE
The following instructions are for PVC/ABS DWV vent
piping, only. DO NOT USE THESE TECHNIQUES FOR
POLYPROPYLENE VENT PIPING SYSTEMS. See the
polypropylene vent system manufacturer's instructions
for installing polypropylene venting systems.
Install the remaining vent and combustion air pipes as shown
below. It is recommended that all pipes be cut, prepared, and
preassembled before permanently cementing any joint.
1. Working from furnace to outside, cut pipe to required
length(s).
2. De−burr inside and outside of pipe.
3. Chamfer outside edge of pipe for better distribution of
primer and cement.
4. Clean and dry all surfaces to be joined.
5. Check dry fit of pipe and mark insertion depth on pipe.
6. Insert the vent pipe into the vent elbow.
7. Torque clamp on vent elbow 15 lb−in.
Diameter
PVC Sch 40
1 1/2−in.
38−mm
2−in.
51−mm
2 1/2−in.
64−mm 1067−mm
3−in.
76−mm 1067−mm
4−in.
102−mm 1219−mm
CAUTION
!
FURNACE RELIABILITY HAZARD
Failure to follow this caution may result in nuisance short
cycling, frozen vent termination, and/or no heat.
Slope the vent and combustion air piping downward towards
furnace at a minimum of 1/4−in. per linear ft. of pipe.
17. Slope the vent and combustion air piping and downward
towards furnace. A minimum slope of at least 1/4 in. per
linear ft.(1 in. per 4 ft.) with no sags between hangers is
required. See Caution Box below.
18. Complete the vent and combustion air pipe installation
by connecting the concentric vent or by installing the
required termination elbows as shown in Figs. Figure 54,
Figure 55 and Figure 56.
19. For Ventilated Combustion
Figure 57.
20. Use appropriate methods to seal openings where
combustion air pipe and vent pipe pass through roof or
sidewall.
46
Hanger Spacing
SDR 21 & 26
3−ft. 2 1/2−ft.
914−mm 762−mm
3−ft. 3−ft.
914−mm 914−mm
3 1/2−ft. 3−ft.
914−mm
3 1/2−ft. 3−ft.
914−mm
4−ft. 3 1/2−ft.
1067−mm
Air Termination,
Specifications subject to change without notice.
8. Torque clamp on vent coupling 15 lb−in.
9. Insert the combustion air pipe into the adapter.
10. Pilot drill a screw hole through the adapter into the
combustion air pipe and secure the pipe to the adapter
with sheet metal screws. DO NOT DRILL INTO
POLYPROPYLENE VENT PIPES. Use an optional
accessory vent coupling, if needed.
11. Seal around the combustion air pipe with silicone or foil
tape. SILICONE
APPROPRIATE
SYSTEMS. SEE POLYPROPYLENE VENT SYSTEM
MANUFACTRUER'S INSTRUCTIONS.
12. After pipes have been cut and preassembled, apply
generous layer of cement primer to pipe fitting socket
and end of pipe to insertion mark. Quickly apply
approved cement to end of pipe and fitting socket (over
primer). Apply cement in a light, uniform coat on inside of
socket to prevent buildup of excess cement. Apply
second coat. DO NOT CEMENT POLYPROPYLENE
FITTINGS.
13. While cement is still wet, twist pipe into socket with
1/4−in. turn. Be sure pipe is fully inserted into fitting
socket.
14. Wipe excess cement from joint. A continuous bead of
cement will be visible around perimeter of a properly
made joint.
15. Handle pipe joints carefully until cement sets.
16. Horizontal portions of the venting system shall be
supported to prevent sagging. Space combustion air
piping and vent piping hangers as shown in the table
below. Support pipes using perforated metal hanging
strap or commercially available hangers or straps
designed to support plastic pipe.
Material
ABS
3−ft.
914−mm
3−ft.
914−mm
3 1/2−ft.
1067−mm
3 1/2−ft.
1067−mm
4−ft.
1219−mm
!
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
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
See
maintain a sealed vestibule. See Figure 50.
1. Insert a length of vent pipe through the casing into the
outlet of the vent elbow.
Gas Furnace: R9MSB
SEALERS MAY
FOR POLYPROPYLENE
CPVC Polypropylene
3−ft.
914−mm 1000 mm
3−ft.
914−mm 1000 mm
3 1/2−ft.
1067−mm 1000 mm
3 1/2−ft.
1067−mm 1000 mm
4−ft.
1219−mm 1000 mm
WARNING
USE THIS TECHNIQUE
440 01 6001 05
NOT BE
VENT
3.25−ft.
3.25−ft.
3.25−ft.
3.25−ft.
3.25−ft.
FOR