7
23
5. Inspect the filter. If torn, replace the filter.
6. 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 the opposite direction of airflow
(through the cross-mesh binding side). Allow filter to
dry.
7. Reinstall the clean filter with the cross-mesh binding
side facing the furnace blower.
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. 14, 16, and
23.)
NOTE:
For upflow models only—if side return ducts are
used, 2 filters may be required in some models. The pro-
cedure 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 chan-
nel on top of the furnace. (See Fig. 24.)
1. Turn OFF electrical supply to the furnace. (See Fig.
19.)
2. Remove blower access doors after removing 2 screws.
3. Remove the left side filter by tipping the filter toward
the center—raise it from the V-shaped channel in
which it rests. (See Fig. 24 and 25.)
24 25
4. Lower filter down along side of the blower and
remove from the furnace.
5. To remove the second filter, lift from V-shaped chan-
nel and remove 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 the opposite direction of airflow
through the cross-mesh binding side. Allow filter to
dry.
8. Reinstall the clean filters with the cross-mesh binding
side facing the furnace blower.
9. Replace blower door (secure with 2 screws) and turn
ON electrical power to your furnace.
UPFLOW FURNACE FILTER TABLE
DOWNFLOW/HORIZONTAL
FURNACE FILTER TABLE
*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.
Buildups 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—call your ser-
vicing dealer.
Use your flashlight and follow these steps for inspecting
the combustion area and vent system of your furnace:
1. Turn off the electrical supply to the furnace and
remove the access doors. (See Fig. 9 and 10, or 11.)
2. Carefully inspect the gas burner (see Fig. 26) for dirt,
rust, or scale. Then, inspect the relief box, flue con-
nection area, and the vent pipe for rust.
NOTE: If dirt, rust, soot, or scale accumulations are found,
call your servicing dealer. DO NOT OPERATE THE
FURNACE.
3. Inspect the vent pipe for a sag, holes, or a disconnec-
tion. A horizontal vent pipe must slope upward. If
rusty joints or seams, or signs of water leakages are
found call your dealer for service.
FURNACE
CASING
WIDTH
FILTER SIZE
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 (2) 16 x 25 x 1* (1) 24 x 25 x 1* Cleanable
FURNACE
CASING WIDTH
FILTER
SIZE
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
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