Installing The Vent Termination - Bryant 987MA Installation, Start-Up, Operating And Service And Maintenance Instructions

2. Rotate the vent elbow to the required position. There are
rounded notches in the vent elbow to align it with the
inducer housing for each orientation.
3. Tighten the clamp around the vent elbow. Torque the clamp
to 15 lb- -in. See Fig. 38- -41.
Installing the Vent Pipe Adapter and Combustion Air
Pipe Adapter
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury or death.
To route the vent pipe and combustion air pipe through the
furnace, the manufacturer supplied kit must be used. Failure
to properly seal the blower compartment from the furnace
vestibule could result in the circulation of carbon monoxide
throughout the structure. The vent pipe and combustion air
pipe must be a continuous pipe while passing through the
blower compartment. Seals supplied in this kit must be
installed per the instructions provided. Follow all
procedures outlined in these instructions.
NOTE: The rubber coupling that attaches to the vent pipe adapter
must be used. The adapter seals the vent pipe to the casing and
reduces the strain on the vent elbow attached to the inducer.
1. Apply the gaskets to the vent pipe and combustion air pipe
adapters. See Fig. 36.
NOTE: The vent pipe adapter and the combustion air pipe adapter
have the same ID however, the combustion air pipe adapter has a
pipe stop at the end.
2. Align the screw holes in the plastic vent pipe adapter with
the dimples in the casing.
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.
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. Deburr 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.
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 combus-
tion air pipe and secure the pipe to the adapter with sheet
metal screws.
11. Seal around the combustion air pipe with silicone or foil
tape.
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.
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 ce-
ment 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 suppor-
ted to prevent sagging. Support combustion air 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 slop-
ing 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 the concentric vent or by installing the required
termination elbows as shown in Fig. 46, 47 and 48.
For Ventilated Combustion Air Termination, See Fig. 49
19. Use appropriate methods to seal openings where combus-
tion air pipe and vent pipe pass through roof or sidewall.
Optional Installation of the Vent Pipe
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 Fig. 42.
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"

Installing the Vent Termination

Roof Terminations
A roof termination of any type will require a 4-in. (102 mm)
flashing for a 2 inch (51 mm) concentric vent or a 5- -in. diameter
(127 mm) flashing for a 3-inch (76 mm) concentric vent kit. For
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