9
28 29
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 Manual 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 with two screws and main furnace door. (See Fig. 30 and 31.) Turn on electrical supply to the
furnace. (See Fig. 32.)
30 31 32
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 air 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 different filter size. Measure the filter to obtain the correct size.
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 adjacent to the furnace or outside your
home 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. Accumu-
lations on the main burners can result in firing out of normal sequence. This delayed ignition creates an alarmingly loud sound.
To inspect the combustion area and vent system, you will need a flashlight. Refer to Fig. 1, and proceed as follows:
1. Turn off gas and electrical supplies to the furnace and remove the main furnace door. (See Fig. 7, 8, and 9.)
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 especially loud noise when the main burners light, shut down your fur-
nace and call your dealer.
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