Filter
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7
FILTERING OUT
TROUBLE
A dirty air filter will cause a loss of airflow
in your duct system. When excessive loss
of airflow occurs, the furnace may cycle
on its safety controls. If this condition is
left unattended, the furnace will eventu-
ally lock out. It is recommended that the
furnace air filter be checked every 3 or 4
weeks and cleaned if necessary.
The air filter is normally located in the
blower compartment. (See Fig. 2.)
If air filter has been installed in another
location, contact your dealer for instruc-
tions. To inspect, clean, and/or replace
the air filter(s), follow these steps:
1. Turn off electrical supply to the
furnace. (See Fig. 18.)
2. Remove main furnace door.
(See Fig. 21.)
3. Remove blower access panel.
(See Fig. 22.)
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NOTE:
It will be necessary to remove
2 screws.
4. Remove air filter from furnace.
• AIR FILTER(S) LOCATED IN
BOTTOM:
a. Slide filter retainer sideways until
it is free of latch. (See Fig. 23.)
CAUTION
Never operate your furnace
without the air filter in place.
Doing so may damage the fur-
nace blower motor. An accu-
mulation of dust and lint on
internal parts of your furnace
can cause a loss of efficiency.
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b. Slide air filter out of furnace.
(See Fig. 24.)
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• AIR FILTER LOCATED IN SIDE:
a. Remove filter retainer from latch.
(See Fig. 25.)
b. Gently remove air filter and care-
fully turn the dirty side up (if
dirty) to avoid spilling dirt from
the filter. (See Fig. 26.)
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5. Inspect the filter. If torn, replace it.
NOTE:
If washable filter that was
shipped with the furnace has been
replaced with an electronic air cleaner
(EAC), refer to the EAC Owner’s Man-
ual for maintenance information.
6. Wash filter (if dirty) in a 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.
7. Reinstall clean air filter.
8. Reinstall filter retainer.
9. Replace blower access panel and
main furnace door. Be sure to
replace 2 screws in blower access
panel. (See Fig. 27 and 28.) Turn
on electrical supply to the furnace.
If your furnace air filter needs to be
replaced, be sure to use the same size
and type of filter that was originally
supplied. Use the furnace filter table
and compare your furnace size with
the proper filter size.
FURNACE AIR FILTER TABLE
* Furnace with a side return-air inlet may have a dif-
ferent filter size. Measure the filter to obtain the
correct size.
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FURNACE
CASING WIDTH
(IN.)
FILTER SIZE*
(IN.) FILTER TYPE
17-1/2 (1) 16 x 25 x 1 Cleanable
21 (1) 20 x 25 x 1 Cleanable
24-1/2
(1) 24 x 25 x 1
Cleanable
CAUTION
Use care when cutting support
rods in filters to protect
against flying pieces and
sharp rod ends. Wear safety
glasses, gloves, and appropri-
ate protective clothing. Failure
to follow this caution could re-
sult in personal injury.
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