International comfort products A Series Installation Instructions Manual page 31

NOTICE
RECOMMENDED SUPPORT FOR
VENT TERMINATIONS
It is recommended that sidewall vent terminations in excess of
24 inches (0.6 M) or rooftop terminations in excess of 36
inches (1 M) in vertical length be supported by EITHER the
Direct Vent Termination Kit (Table 14) 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 (Fig. 54 or
Fig. 55) per application.
2. The vent termination must be located at least 3 feet from an
inside corner and follow the clearance distances in the In-
side Corner Termination drawing.
3. Termination or termination kit should be positioned where
vent vapors will not damage plants/shrubs, air conditioning
equipment or utility meters.
4. 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.
5. Termination or termination kit should be positioned where it
will not be damaged by or subjected to foreign objects such
as stones, balls, etc.
6. 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. For references to vent clearances required by
National code authorities (Fig. 54). Allowable vent and
combustion air terminations (Fig. 56).
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:
Current edition of Section 9.3 NFPA 54/ANSI Z223.1 Air for
Combustion and Ventilation and applicable provisions of the
local building codes.
Ventilated Combustion Air
The vent pipe for a Ventilated Combustion Air System must
terminate outdoors. For references to vent clearances required by
National code authorities (Fig. 55). Allowable vent terminations
(Fig. 57). The combustion air pipe terminates in a well- -ventilated
attic or crawl space. Follow the clearances (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.
440 01 4601 01
Non-Direct Vent / 1-Pipe System
The vent pipe for a Non Direct Vent (1- -pipe) system must
terminate outdoors. References to vent clearances required by
National Code authorities (Fig. 55). Allowable vent terminations
(Fig. 57).
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. (Fig. 42) 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.
(NON-DIRECT VENT FOR ALL MODELS EXCEPT MODULATING UNLESS
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 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 (Fig.
45).
The Maximum Vent Length for the vent and combustion air pipe
(when used) is determined from the Maximum Equivalent Vent
Length (Table 18) minus the number of fittings multiplied by the
deduction for each type of fitting used (Table 19).
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. (Fig. 43).
When sizing venting systems, the equivalent length of the
optional moisture trap (15 feet/5 M) must be taken into
account.
Specifications subject to change without notice.
12" (256mm) minimum
to
60"(1524 mm) or
1 additional elbow maximum
CASING SIDE OR TOP ATTACHMENT
COMBUSTION AIR PIPE
INSTALLED IN ATTIC OR CRAWL SPACE)
Fig. 42 - - Combustion Air Pipe Attachment
NOTICE
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