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N92MSN: Installation, Start-up, Operating and Service and Maintenance Instructions
12" (256mm) minimum
60"(1524 mm) or
1 additional elbow maximum
CASING SIDE OR TOP ATTACHMENT
COMBUSTION AIR PIPE
(NON-DIRECT VENT FOR ALL MODELS EXCEPT MODULATING UNLESS
INSTALLED IN ATTIC OR CRAWL SPACE)
Fig. 46 – Combustion Air Pipe Attachment
Non-Direct Vent / 1-Pipe System
The vent pipe for a Non Direct Vent (1-pipe) system must terminate
outdoors. See
Fig. 43
for references to vent clearances required by
National Code authorities. Allowable vent terminations are shown in
Fig.
40.
A combustion air inlet pipe to the outdoors is not required for a
Non-Direct (single-pipe) Vent System. A 12-in. long section of pipe with
a tight radius 2-in. (51 mm) 90 degree elbow is required to be attached to
the furnace. See
Fig.
48. This short inlet air pipe helps to ensure stable
combustion, as well as allow for sound attenuation. To aid sound
attenuation, point the inlet air pipe away from occupants. An extra elbow
and/or five feet of pipe may be used to accomplish the sound attenuation
function.
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the instructions outlined below for each appliance
being placed into operation could result in carbon monoxide poisoning
or death.
For all venting configurations for this appliance and other gas
appliances placed into operation for the structure, provisions for
adequate combustion, ventilation, and dilution air must be provided in
accordance with:
U.S.A. Installations: Section 9.3 of current edition of NFPA 54/ANSI
Z223.1 Air for Combustion and Ventilation and applicable provisions
of the local building codes.
Canadian
Installations:
CAN/CSA-B149.1. Venting Systems and Air Supply for Appliances
and all authorities having jurisdiction.
NOTE: Termination Requirements for the Provinces of Alberta and
Saskatchewan
The Provinces of Alberta and Saskatchewan require a minimum
unobstructed distance of 4 ft. (1.2 M) from the foundation to the property
line of the adjacent lot for vent termination of any appliance with an
input over 35,000 BTUh. If there is less than 4 ft. (1.2 M) of
unobstructed distance to the property line of the adjacent lot, no type of
vent termination is permitted for appliances with inputs greater than
35,000 BTUh.
There are no additional restrictions on unobstructed distances greater
than 8 ft. (2.4 M). All single, two-pipe and concentric vents may be used,
providing all other Code and manufacturer's requirements in these
instructions are adhered to. Refer to the appropriate Vent Termination
section above for locating the vent termination
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
to
Part
8
of
current
edition
If the unobstructed distance from the foundation to the property line of
the adjacent lot is no less than 4 ft. (1.2 M) and no greater than 8 ft. (2.4
M), it will be necessary to re-direct the flue gas plume. In this situation, a
concentric vent kit cannot be used. A 2-pipe termination (or single pipe
termination when permitted) that re-directs the flue gas away by use of
an elbow or tee, certified to ULC S636 from the adjacent property line
must be used. See
Fig.
The concentric vent kit currently cannot be modified to attach an elbow
to the vent portion of the rain cap. A tee attached to the rain cap could
potentially direct the flue gas plume toward the intake air stream and
contaminate the incoming combustion air for the furnace.
Refer to
Fig. 48
for terminations approved for use in Alberta and
Saskatchewan.
Size the Vent and Combustion Air Pipes
General
Furnace combustion air and vent pipe connections are sized for 2-in. (50
mm ND) PVC/ABS DWV pipe. The combustion air and vent pipe
A13406
connections also accommodate 60 mm polypropylene venting systems
with outside diameters of approximately 60 mm (2-3/8 inches). Any pipe
diameter change should be made outside furnace casing in vertical pipe.
Any change in diameter to the pipe must be made as close to the furnace
as reasonably possible. See
The Maximum Vent Length for the vent and combustion air pipe (when
used) is determined from the Maximum Equivalent Vent Length in
Table 15
minus the number of fittings multiplied by the deduction for
each type of fitting used from
Ventilated Combustion Air
intake termination in crawl
space
of
Fig. 47 – Vent Terminations for Ventilated Combustion Air
36
48.
Fig.
49.
Table
16.
Ventilated Combustion
Air intake pipe
Pipe hangar
3" (76 mm)
12" (305 mm)
CRAWL SPACE
ATTIC
highest level of insulation
A10497
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