7
5. Inspect the filter. If torn, replace the filter.
6. Wash the 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
the filter in the opposite direction of airflow. Allow filter
to dry.
7. Reinstall the clean filter.
8. Put filter retainer back in the bracket opening and lock it
in place.
9. Replace blower and control access doors and turn ON
electrical power to your furnace. (See Fig. 16, 17, and 26.)
NOTE:
For upflow models only—if side return ducts are used,
2 filters may be required in some models. The procedure listed
above may be used to remove side filters.
•
Downflow/Horizontal Furnaces Only:
Two filters are located in the return-air plenum above the
blower (above line-of-sight) resting in the V-shaped channel
on top of the furnace. (See Fig. 27.)
1. Turn OFF electrical supply to the furnace. (See Fig. 21.)
2. Remove 2 screws from blower access door and remove
the door.
3. Remove the left-side filter by tipping the filter toward
the center and raising it from the V-shaped channel in
which it rests. (See Fig. 27 and 28.)
4. Lower filter down along side of the blower and remove
from the furnace.
5. To remove the right-side filter, lift from V-shaped channel
and remove through left side the same way as left-side filter.
6. Inspect the filter. If torn, replace the filter.
7. Wash the 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 the filter in opposite direction of airflow. Allow
filter to dry.
8. Reinstall the clean filters.
27 28
9. Replace blower door and secure with 2 screws. Turn
on electrical power to your furnace.
* Factory provided with the furnace. Filters may be field modified by cutting
to size. Alternate sizes and additional filters may be ordered from your dealer.
COMBUSTION AREA AND
VENT SYSTEM
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. Build-
ups on the main burners can cause faulty firing. This “delayed
ignition’’ is characterized by an alarmingly loud sound. If
your furnace makes a loud noise when the main burners are
ignited, shut down the furnace and call your 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 doors. (See Fig. 9, and 10 or 11.)
2. Carefully inspect the gas burner for dirt, rust, or scale
(see Fig. 29). Inspect the relief box, flue connection
area, and the vent pipe for rust.
29
UPFLOW FURNACE FILTER TABLE
FURNACE
CASING
WIDTH (IN.)
FILTER SIZE (IN)
FILTER
TYPESide Return Bottom Return
14-3/16 (1) 16 x 25 x 1* (1) 14 x 25 x 1 Cleanable
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
DOWNFLOW/HORIZONTAL
FURNACE FILTER TABLE
FILTER
CASING WIDTH
FILTER
SIZE (IN)
FILTER
TYPE
14-3/16 (2) 16 x 20 x 1* Cleanable
17-1/2 (2) 16 x 20 x 1* Cleanable
21 (2) 16 x 20 x 1* Cleanable
24-1/2 (2) 16 x 20 x 1* Cleanable
CAUTION
Use care when cutting support rods in filters to pro-
tect against flying pieces and sharp rod ends. Wear
safety glasses, gloves, and appropriate protective
clothing. Failure to follow this caution could result
in personal injury.
!
(12 pages)
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