8
27 28
5. 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 oppo-
site direction of airflow. Allow filter to dry.
6. Reinstall clean air filter
7. Reinstall filter retainer (for blower compartment locations
only)
8. Replace blower access panel and main furnace door (see Fig.
29 and 30) or filter cabinet door (Fig. 40 and 41)
9. Turn on electrical supply to furnace.
29 30
* Factory-provided with the furnace. 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.
COMBUSTION AREA AND VENT
SYSTEM
Visually inspect the combustion are 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 adjacent to the fur-
nace for blockage. Also check 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 improper-
ly. Accumulations on the main burners can result in firing out
of normal sequence. This delayed ignition creates an alarm-
ingly loud sound.
To inspect the combustion area and vent system, you will
need a flashlight. Refer to Fig. 3 or 4, and proceed as follows:
1. Turn off the gas and electrical supplies to the furnace and
remove the main furnace door. (See Fig. 9, 10, and 11.)
2. Remove burner enclosure front. (See Fig. 31 or 32.)
Inspect the gas burners and ignitor area for dirt, rust, soot, or
scale.
3. Inspect the combustion-air and vent pipes for sags, holes,
cracks, or disconnections.
31 32
UPFLOW FURNACE AIR FILTER TABLE
AIR FILTER LOCATED IN BLOWER COMPARTMENT
FURNACE
CASING
WIDTH (IN.)
FILTER SIZE (IN)
FILTER
TYPESide Return Bottom Return
17-1/2 (1) 16 x 25 x 1* (1) 16 x 25 x 1* Cleanable
21 (1) 16 x 25 x 1 (1) 20 x 25 x 1* Cleanable
24-1/2 (1 or 2) 16 x 25 x 1 (1) 24 x 25 x 1* Cleanable
AIR FILTER LOCATED IN FILTER CABINET
FILTER
CABINET
HEIGHT (IN)
FILTER
SIZE (IN)
FILTER
TYPE
16 (1) 16 x 25 x 1*
or (1) 16 x 25 x 4-5/16
Cleanable
Disposable
20 (1) 20 x 25 x 1*
or (1) 20 x 25 x 4-5/16
Cleanable
Disposable
24 (1) 24 x 25 x 1*
or (1) 24 x 25 x 4-5/16
Cleanable
Disposable
CAUTION
Use care when cutting support rods in filters to
protect against flying pieces and sharp rod ends.
Wear safety glasses, gloves, and appropriate pro-
tective clothing. Failure to follow this caution
could result in personal injury.
CAUTION
If your furnace makes an especially loud noise
when the main burners light, shut down your fur-
nace and call your dealer.
CAUTION
If dirt, rust, soot, or scale accumulations are found,
call your dealer. Do not operate your furnace.
!
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