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Venting Systems
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 this structure, provisions
for adequate combustion, ventilation, and dilution air must be
provided in accordance with:
USA Installations:
Section 9.3 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.
Vent and
1 1/2--in.
Combustion Air
(38 mm)
Pipe Diameters
1 1/2--in. (38 mm)
2--in. (51 mm)
2 1/2--in. (64 mm)
3--in. (76--mm)
4--in. (102 mm)
Direct Vent / 2-Pipe System
In a direct-vent (2-pipe) system, all air for combustion is taken
directly from outdoor atmosphere, and all flue products are
discharged to outdoor atmosphere. Combustion-air and vent pipes
must terminate together in the same atmospheric pressure zone,
either through the roof (preferred) or a sidewall. See Fig. 53 for
references to clearances required by National code authorities.
NOTICE
OPTIONAL CONFIGURATION FOR COMBUSTION
AIR INLET PIPE
In applications where there is a risk of excessive moisture
entering the combustion air inlet pipe, a moisture trap may be
added to the inlet pipe to help prevent moisture from entering
the furnace from the combustion air inlet pipe. See Fig. 42.
When sizing venting systems, the equivalent length of the
optional inlet pipe moisture trap must be taken into account.
Ventilated Combustion Air Systems
In a ventilated combustion air option, the vent terminates and
discharges the flue products directly to the outdoors similar to a
direct vent system. See Fig. 54 for references to clearances required
by National code authorities.
All air for combustion is piped directly to the furnace from a space
that is well ventilated with outdoor air (such as an attic or crawl
space) and the space is well isolated from the living space or
garage. Combustion air requirements for this option are the same as
the requirements for providing outside air for combustion for a
single pipe vent system. Refer to the "Air For Combustion and
Ventilation" Section.
440 01 4800 01
Part 8 of current edition of
Table 13 – Vent Termination Kit for Direct Vent (2- -pipe) Systems
Approved Two- Pipe Termination Fittings
2--in.
(51 mm)
No
Yes
No
Yes
No
No
No
No
No
No
Specifications subject to change without notice.
NOTICE
RECOMMENDED SUPPORT FOR
VENT TERMINATION
It is recommended that sidewall vent terminations of over 24
inches (0.6 M) in length or rooftop vent terminations of over
36 inches (1 M) in length be supported by EITHER the
factory accessory vent termination kit or field- -supplied
brackets or supports attached to the structure.
accessory vent termination kit may be used for direct vent
terminations. Termination kits are available for 2- -in. or 3- -in.
pipe. See Table 13 for available options.
2 1/2--in.
3--in.
(64 mm)
(76--mm)
No
No
No
No
No
Yes
No
Yes
No
Yes
Non-Direct Vent (1-pipe) System
In a non direct-vent (1-pipe) system, all air for combustion is taken
from the area adjacent to furnace, and all flue products are
discharged to outdoor atmosphere. Air for combustion must be
supplied as described in the Air For Combustion and Ventilation
Section. Do not use an abandoned chimney to supply outside air to
the furnace. See Fig. 54 for references to vent clearances required
by National code authorities.
A combustion air pipe to the outdoors is not required for a
single- -pipe vent system. A 12-in. (304 mm) long pipe with a 2- -in.
(51 mm) tight radius 90 degree elbow is required to be attached to
the combustion air pipe adapter on the furnace. See Fig. 57. 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.
NOTICE
OPTIONAL VENTING BELOW THE FURNACE
The venting system may be positioned below the furnace
ONLY IF the factory accessory External Vent Trap Kit is used.
The External Vent Trap Kit is only approved for PVC/ABS
DWV venting systems.
CAREFULLY
FOLLOW
PROVIDED WITH THE EXTERNAL VENT TRAP KIT
FOR LAYING OUT THE VENTING SYSTEM AND
THE DRAIN SYSTEM. The instructions included with this
furnace DO NOT APPLY to vent systems that are located
below the furnace.
A factory
Allowable
4--in.
Concentric Vent
(102 mm)
Kit
No
2--in. (51 mm)
No
2--in. (51 mm)
2--in. (51 mm)
No
3--in. (76 mm)
No
3--in. (76 mm)
Yes
3--in. (76 mm)
THE
INSTRUCTIONS
41
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