935CA: 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.
37
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. 55
.
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.”
A13076A
A13076B
Fig. 55 – Optional Vent Pipe Flush with Adapter
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, see
Fig. 62
.
Maintain the required separation distance between vents or pairs of vents
(see
Fig. 62
) and all clearance, see
Fig. 60
.
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, see
Fig. 62
and
Fig. 63
.
Maintain the required separation distance between vents or pairs of vents
(see
Fig. 62
and
Fig. 63
) and all clearances, see
Fig. 60
and
Fig. 61
.
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.
NOTICE
!
FOR POLYPROPYLENE VENTING SYSTEMS
When using polypropylene venting systems, all venting materials used,
including the vent terminations, must be from the same manufacturer.
VENT PIPE FLUSH SHOWING COUPLING
ALIGN NOTCHES IN VENT PIPE
COUPLING OVER STAND-OFF
ON ADAPTER. TORQUE LOWER
CLAMP 15 LB-IN. WHEN REMAINING
VENT PIPE IS INSTALLED, TORQUE
UPPER CLAMP TO 15 LB-IN.
