Carrier bryant 915SB, Installation, Start-Up, Operating And Service And Maintenance Instructions

Page: 44 / 66

915SB: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
44
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 Fig. 59 .
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 in. (50 mm ND) concentric vent or a 5-in. diameter (127 mm)
flashing for a 3-in. (80 mm ND) concentric vent kit. For two-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 Fig. 40 .
Maintain the required separation distance between vents or pairs of vents
as shown in Fig. 40 and all clearance shown in Fig. 42 .
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 and Single-Pipe Terminations
Single and two pipe vent must be installed as shown in Fig. 40 and
Fig. 41 . Maintain the required separation distance between vents or pairs
of vents as shown in Fig. 40 and Fig. 41 and all clearance shown in
Fig. 42 and Fig. 43 .
Cut the required number of holes in the roof or sidewall for vent and
(when used) combustion air pipes. Sidewall holes for two-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.
Sidewall Terminations
Concentric Vent
NOTE: Follow the instructions of the vent terminal manufacturer.
These instructions are provided as a reference only.
Determine an appropriate location for termination kit using the
guidelines provided in section “Locating The Vent Termination” in
this instruction.
1. Cut one 4-in. diameter hole for 2-in. kit, or one 5-in. diameter hole
for 3-in. kit.
2. Loosely assemble concentric vent/combustion air termination
components together using instructions in kit.
3. Slide assembled kit with rain shield REMOVED through hole.
NOTE: Do not allow insulation or other materials to accumulate inside
of pipe assembly when installing it through hole.
4. Locate assembly through sidewall with rain shield positioned no
more than 1-in. (25 mm) from wall as shown in Fig. 40 .
5. Disassemble loose pipe fittings. Clean and cement using same
procedures as used for system piping. DO NOT CEMENT
POLYPROPYLENE FITTINGS.
2-Pipe and 1-Pipe Vent Termination
NOTE: Follow the instructions of the vent terminal manufacturer.
These instructions are provided as a reference, only.
NOTICE
!
FOR POLYPROPYLENE VENTING SYSTEMS
When using polypropylene venting systems, all venting materials used,
including the vent terminations, must be from the same manufacturer.
NOTICE
!
RECOMMENDED SUPPORT FOR VENT TERMINATIONS
It is recommended that rooftop vent terminations in excess of 36 inches
(1 M) in vertical length be supported by EITHER the Direct Vent
Termination Kit shown in Table 11 or by field-supplied brackets or
supports fastened to the structure.