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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.)
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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COMBUSTION AREA
AND VENT SYSTEM
Visually inspect the combustion area
and vent system before each heating
season. Make sure that all PVC pipes
leading into the combustion area and
vent are free from any cracks and sags.
Check the combustion-air intake adja-
cent to the furnace for blockage. Also
check the vent pipe on the outside of
your home for blockage.
When dirt, soot, scale, or rust is
allowed to build up, your furnace can
suffer a loss of efficiency and perform
improperly. Accumulations on the
main burners can result in firing out of
normal sequence. This delayed igni-
tion creates an alarmingly loud sound.
To inspect the combustion area and
vent system, you will need a flashlight.
Refer to Fig. 2, and proceed as follows:
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 (2) 16 x 25 x 1 Cleanable
CAUTION
If your furnace makes an espe-
cially loud noise when the
main burners light, shut down
your furnace and call your
dealer.
!