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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.
The instructions included with this furnace DO NOT APPLY
to vent systems that are located below the furnace.
CAREFULLY
FOLLOW
PROVIDED WITH THE EXTERNAL VENT TRAP KIT
FOR LAYING OUT THE VENTING SYSTEM AND
THE DRAIN SYSTEM when all or part of the venting
system is placed below the furnace.
Proper configuration of the venting and drain system is critical
when placing all or part of the venting system below the level
of the furnace. VENT GASSES COULD BE RELEASED
FROM THE DRAINAGE SYSTEM if the instructions
provided with the External Vent Trap Kit are not followed.
Locating the Vent Termination
General
NOTE:
Termination Requirements for the Provinces of
Alberta and Saskatchewan are located at the end of this
section.
Combustion- -air inlet pipe (direct vent/2- -pipe system only) and
vent pipe must terminate outside structure, either through sidewall
or roof.
For vent termination clearance, references to National codes are
shown in Fig. 53 for Direct Vent/2- -Pipe system and Fig. 54 for
Ventilated Combustion Air/Non- -direct Vent/1- -Pipe system. For
exterior termination arrangements, refer to Fig. 55 for Direct
Vent/2- -Pipe system and Fig. 56 for Ventilated Combustion
Air/Non- -Direct/1- -Pipe system. Contact Local code authorities for
other requirements to and/or exemptions from the National codes
shown in the figures.
Roof termination is the recommended termination location. Roof
terminations provide better performance against sustained
prevailing winds. The roof location is preferred since the vent and
combustion
air system is less susceptible
contamination. The
termination is usually located away from
adjacent structures or other
windows, doors or other appliances. It is less prone to icing
conditions, and it often has less visible vent vapors.
Sidewall terminations may require sealing or shielding of building
surfaces with a corrosive resistance material due to the corrosive
properties of combustion products from the vent system, as well as
protection of adjacent structures.
NOTICE
RECOMMENDED SUPPORT FOR
VENT TERMINATIONS
It is recommended that sidewall vent terminations in excess of
24 inches (.6 M) or rooftop terminations in excess of 36 inches
(1 M) in vertical length be supported by EITHER the Direct
Vent Termination Kit shown in Table 13 or by field- -supplied
brackets or supports fastened to the structure.
When determining appropriate location for termination, consider
the following guidelines:
1. Comply with all clearance requirements stated in Fig. 53 or
Fig. 54 per application.
42
THE
INSTRUCTIONS
to damage or
obstacles such as inside corners,
Specifications subject to change without notice.
2. Termination or termination kit should be positioned where
vent vapors will not damage plants/shrubs, air conditioning
equipment or utility meters.
3. Do not locate termination directly into prevailing winds.
Termination should be positioned so that it will not be
affected by sustained prevailing winds over 30 mph, wind
eddy, such as inside building corners, or by recirculation of
flue gases, airborne leaves, or light snow.
4. Termination or termination kit should be positioned where it
will not be damaged by or subjected to foreign objects such
as stones, balls, etc.
5. Termination or termination kit should be positioned where
vent vapors are not objectionable.
Direct Vent / 2-Pipe System
Direct vent (2- -pipe) vent and combustion air pipes must terminate
outside the structure. See Fig. 53 for references to vent clearances
required by National code authorities.
combustion air terminations are shown in Fig. 55.
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:
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.
Ventilated Combustion Air
The vent pipe for a Ventilated Combustion Air System must
terminate outdoors. See Fig. 54 for references to vent clearances
required by National code authorities. Allowable vent terminations
are shown in Fig. 56. The combustion air pipe terminates in a
well- -ventilated attic or crawl space. Follow the clearances as
shown in Fig. 58.
The combustion air pipe cannot terminate in attics or crawl spaces
that use ventilation fans designed to operate in the heating season.
If ventilation fans are present in these areas, the combustion air
pipe must terminate outdoors as a Direct Vent System.
Non-Direct Vent / 1-Pipe System
The vent pipe for a Non Direct Vent (1- -pipe) system must
terminate outdoors. See Fig. 54 for references to vent clearances
required by National Code authorities.
terminations are shown in Fig. 56.
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. 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.
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
Allowable vent and
Part 8 of current edition of
Allowable vent
440 01 4800 01
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