7
441 01 5003 01
Specifications are subject to change without notice
Figure 4
25--23--45
Screws (2)
Furnace with Screws
Vent Plate
4. Replace venter gasket (part # 1013540, if needed) to venter
assembly with adhesive in the same location as the old one.
5. Clip the wire tie for the venter wires, if needed.
6. Rotate venter assembly 90
°
right or left from original location
depending on venting configurations.
Figure 5
Venter Gasket
25--23--52c
7. Tighten the four (4) screws that secure the venter assembly to
the collector box. Do tighten screws enough to compress
venter gasket.
8. Replace power leads to venter motor and reconnect hose to
pressure switch.
NOTE: Unused open vent hole must be covered. A 5
5
/
16
″
(135 mm)
diameter Vent Cover is available separately from your distributor, or
one can be fabricated with sheet metal for side vent installations.
4. Combustion & Ventilation Air
CARBON MONOXIDE POISONING HAZARD.
Failure to follow this warning could result in
personal injury or death.
Use methods described here to provide
combustion and ventilation air.
!
WARNING
Furnaces require ventilation openings to provide sufficient air for
proper combustion and ventilation of flue gases. All duct or
openings for supplying combustion and ventilation air must comply
with the gas codes, or in the absence of local codes, the applicable
national codes.
Combustion and ventilation air must be supplied in accordance with
one of the following:
Note: The Combustion & Ventilation Air Section in this document,
uses tables and information from the ANSI Z223.1/NFPA 54.
For use in Canada, use CSA B149.1 for this information.
1. Section 9.3, Air for Combustion and Ventilation, of the National
Fuel Gas Code, (NFGC), ANSI Z223.1--2006/NFPA 54--2006.
2. Sections 8.2, 8.3, 8.5, 8.6, 8.7, and 8.8 of National Standard of
Canada, Natural Gas and Propane Installation Code
(NSCNGPIC), CSA B149.1--05 in Canada,
3. Applicable provisions of the local building code.
When the installation is complete, check that all appliances have
adequate combustion air and are venting properly. See
Venting And
Combustion Air Check
in “
Gas Vent Installation”
Section in this
manual.
Contaminated Combustion Air
Installations in certain areas or types of structures could cause
excessive exposure to contaminated air having chemicals or
halogens that will result in safety and performance related problems
and may harm the furnace. These instances must use only outdoor
air for combustion.
The following areas or types of structures may contain or have
exposure to the substances listed below. The installation must be
evaluated carefully as it may be necessary to provide outdoor air for
combustion.
•
Commercial buildings.
•
Buildings with indoor pools.
•
Furnaces installed in laundry rooms.
•
Furnaces installed in hobby or craft rooms.
•
Furnaces installed near chemical storage areas.
•
Permanent wave solutions for hair.
•
Chlorinated waxes and cleaners.
•
Chlorine based swimming pool chemicals.
•
Water softening chemicals.
•
De--icing salts or chemicals.
•
Carbon tetrachloride.
•
Halogen type refrigerants.
•
Cleaning solvents (such as perchloroethylene).
•
Printing inks, paint removers, varnishes, etc.
•
Hydrochloric acid.
•
Sulfuric Acid.
•
Solvent cements and glues.
•
Antistatic fabric softeners for clothes dryers.
•
Masonry acid washing materials.
Outdoor Combustion Air Method
A space having less than 50 cubic feet per 1,000 BTUH input rating
for all gas appliances installed in the space requires outdoor air for
combustion and ventilation.
Air Openings and Connecting Ducts
1. Total input rating for all gas appliances in the space
MUST
be
considered when determining free area of openings.
2. Connect ducts or openings directly to the outdoors.
3. When screens are used to cover openings, the openings
MUST
be no smaller than
1
/
4
″
(6.4 mm) mesh.
4. The minimum dimension of air ducts
MUST NOT
be less than
3
″
(76 mm).
5. When sizing a grille, louver or screen use the free area of
opening. If free area is
NOT
stamped or marked on grill or
louver, assume a 20% free area for wood and 60% for metal.
Screens shall have a mesh size not smaller than
1
/
4
″
(6 mm).
