Venting Systems - International comfort products F9MVT Installation Instructions Manual

INSTALLATION INSTRUCTIONS

Venting Systems

WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the instructions outlined in Locating the
Vent Termination 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 di-
lution air must be provided in accordance with:
U.S.A. Installations: Section 9.3 NFPA 54/ANSI
Z223.1 1−2012, Air for Combustion and Ventilation and
applicable provisions of the local building codes.
Canadian Installations:
CAN/CSA−B149.1−10.
Supply for Appliances and all authorities having
jurisdiction.
NOTICE
RECOMMENDED SUPPORT
TERMINATIONS
It is recommended that sidewall vent terminations of
over 24 inches (0.6 M) in length or rooftop vent termin-
ations 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. A factory accessory vent termination kit may
be used for direct vent terminations. Termination kits
are available for 2-in. or 3-in. pipe. See Table 12 for
available options.
Vent Termination Kit for Direct
Table 12
Vent (2−Pipe) Systems
Direct Vent
Termination
(2−Pipe)
System
Termination Kit
2−in (51 mm)
Single Penetration
Concentric Vent
of Wall or Roof
Kit
3−in (76 mm)
Single Penetration
Concentric Vent
of Wall or Roof
Kit
2−in (51 mm) 2−Pipe
Termination Termination
Bracket Kit System
3−in (76 mm) 2−Pipe
Termination Termination
Bracket System
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 Figure 60 for references to clearances required by
National code authorities.
38
Part 8
Venting Systems and Air
FOR VENT
Diam. Of
Combustion Air
and Vent Pipes
in.(mm)
1, 1−1/2, 2, or 2−1/2
(25, 38, 51, 64 mm)
2−1/2, 3 or 4
(64, 76, 102 mm)
1, 1−1/2, 2, or 2−1/2
(25, 38, 51, 64 mm)
2−1/2, 3 or 4
(64, 76, 102 mm)
Specifications subject to change without notice.
Gas Furnace: (F/G)9MVT, (F/G)9MXT, (F/G)9MXE
NOTICE
OPTIONAL CONFIGURATION FOR COMBUSTION
AIR INLET PIPE
In applications where there is a risk of excessive mois-
ture 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 combus-
tion air inlet pipe. See Figure 51.
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
of
direct vent system. See Figure 61 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."
Provisions for adequate combustion, ventilation, and dilution air
must be provided in accordance with:
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.
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 Figure 61 for references
to 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. (50 mm Nominal Dimension− ND) tight radius 90 degree
elbow is required to be attached to the combustion air pipe
adapter on the furnace. (See Figure 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 (1.5 M) of
pipe may be used to accomplish the sound attenuation
function.
OPTIONAL VENTING BELOW THE FURNACE
The venting system may be positioned below the fur-
nace 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 THE INSTRUCTIONS
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
Air for combustion
NOTICE
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