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912SD: Installation, Start-up, Operating and Service and Maintenance Instructions
Combustion Air and Vent Piping Insulation
Guidelines
NOTE: Use closed cell, neoprene insulation or equivalent.
The vent pipe may pass through unconditioned areas. The amount of
exposed pipe allowed is shown in
1. Using winter design temperature (used in load calculations), find
appropriate temperature for your application and furnace model.
2. Determine the amount of total and exposed vent pipe.
3. Determine required insulation thickness for exposed pipe length(s).
4. When combustion air inlet piping is installed above a suspended
ceiling, the pipe MUST be insulated with moisture resistant
insulation such as Armaflex or other equivalent type of insulation.
5. Insulate combustion air inlet piping when run in warm, humid
spaces.
6. Install the insulation per the insulation manufacturer's installation
instructions.
NOTE: Pipe length (ft. / M) specified for maximum pipe lengths located
in unconditioned spaces cannot exceed total allowable pipe length as
calculated from
Table
13.
Configure the Furnace
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.
Use 45 deg. Elbows where
Avoid short horizontal offsets with 90
possible, to ensure conden-
deg. Elbows. Short offsets can be
sate drainage.
difficult to slope and may trap con-
densate.
Fig. 52 – Near Furnace Vent Connections
TABS ON THE INDUCER OUTLET RESTRICTOR SNAP
Fig. 53 – Inducer Vent Elbow
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table
15.
Slope vent pipe back to the
furnace at least ¼" per foot
INTO THE SLOTS AT THE OUTLET OF THE INDUCER
FOR USAGE:
SEE MAXIMUM EQUIVALENT VENT LENGTH TABLE
(10FT. (3.1 M) OF VENT OR LESS ONLY)
3
2
&
5
UPFLOW LEFT CONFIGURATION
Any other unused
knockout may be used
for combustion air
connection.
Rotate vent elbow to
required position.
UPFLOW RIGHT CONFIGURATION
Any other unused
knockout may be used
for combustion air
connection.
Fig. 54 – Upflow Configurations (Appearance may vary)
See "Notes for Venting Options"
A14546
DOWNFLOW LEFT CONFIGURATION
A170006
41
7
6
4
5
1
6
2
1
4
5
7
6
UPFLOW VERTICAL VENT
Rotate vent elbow to
3
required position.
2
5
4
5
1
6
7
Any other unused
knockout may be used
for combustion air
connection.
Rotate vent elbow to
required position.
A11309A
7
5
3
A11308A
3
2
5
1
4
5
A11310A
A11311A
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