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dealer for instructions. To inspect, clean and/or replace the air
filter(s), follow these steps:
1. Turn off the electrical supply to the furnace.
Figure 13 − Turn Off Electrical Supply
2. Remove filter cabinet door/rack.
3. Slide air filter out of filter cabinet/rack. Keep dirty side up
(if dirty) to avoid spilling dirt.
4. Inspect the filter. If torn, replace it.
NOTE: If the filter is:
FURNACE
CASING WIDTH
SIDE RETURN
in (mm)
14-1/2 (368)
(1) 16 x 25 (406 x 635)
17-1/2 (445)
(1) 16 x 25 (406 x 635)
21 (533)
(1) 16 x 25 (406 x 635)
24 (610)
(1) 16 x 25 (406 x 635)
*Recommended
**Some furnaces may have 2 filters
CAUTION
!
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal
injury.
Use care when cutting support rods in filters to protect
against flying pieces and sharp rod ends. Wear safety
glasses, gloves, and appropriate protective clothing.
COMBUSTION AREA AND VENT SYSTEM
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in personal
injury.
Failure to follow this warning could result in personal
injury or death.
For proper and safe operation the furnace needs air for
combustion and ventilation. Do not block or obstruct air
openings on the furnace, air opening to the area in
which the furnace is installed, and the space around the
furnace.
Inspect the combustion area and vent system before each
heating season. An accumulation of dirt, soot, or rust can
mean a loss of efficiency and improper performance. Buildups
on the main burners can cause faulty firing. This "delayed
ignition" is characterized by an alarmingly loud sound.
NOTE: If your furnace makes a loud noise when the main
burners are ignited, shut down the furnace and call your
6
A92185
FILTER QUANTITY AND SIZE *
**
BOTTOM RETURN
in (mm)
(1) 14 x 25 (356 x 635)
(1) 16 x 25 (406 x 635)
(1) 20 x 25 (508 x 635)
(1) 24 x 25 (610 x 635)
Specifications subject to change without notice.
a. a factory specified disposable media filter — Do not
clean. If dirty, replace only with media filter having
the same part number and size. Install with airflow
direction arrow pointing towards blower.
b. an Electronic Air Cleaner (EAC) — Refer to EAC
Owner's Manual for maintenance information.
c. a factory specified disposable filter do not clean,
replace it with a new filter of same size.
d. a washable filter, wash filter (if dirty) in sink, bathtub,
or outside with a garden hose. Always use cold tap
water. A mild liquid detergent may be used if
necessary. Spray water through filter in the opposite
direction of airflow. Allow filter to dry.
5. Reinstall clean air filter.
6. Replace filter cabinet door.
7. Turn on electrical supply to furnace (See Figure 11).
NOTE:
If side return ducts are used, two filters may be
required in some models. The procedure listed above may be
used to remove side filters.
Filters may be field modified by cutting filter material and
support rods (3) in filters. Alternate sizes and additional filters
may be ordered from your dealer.
in (mm)
1" (25 mm) thick cleanable or 4-5/16" (110 mm)
thick media-type
1" (25 mm) thick cleanable or 4-5/16" (110 mm)
thick media-type
1" (25 mm) thick cleanable or 4-5/16" (100 mm)
thick media-type
1" (25 mm) thick cleanable or 4-5/16" (100 mm)
thick media-type
servicing dealer.
Use your flashlight and follow these steps for inspecting the
combustion area and vent system of your furnace:
1. Turn off electrical supply to the furnace and remove the
access door. (See Figure 8 and Figure 9)
2. Carefully inspect the gas burner for dirt, rust, or scale.
Inspect the elbow, flue connection area, and the vent
pipe for rust.
Figure 14 − Burner Flame
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in
personal injury or death.
If dirt, rust, soot, or scale accumulations are
found, call your dealer. Do not operate your
furnace.
FILTER TYPE*
A92330
441 02 2401 01
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