7
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
through the cross-mesh binding (when present) side.
Allow filter to dry.
8. Reinstall the clean filters with the cross-mesh binding
(when present) side facing the furnace blower.
27 28
9. Replace blower door and secure with 2 screws. Turn
on electrical supply to your furnace. (See Fig. 18.)
* Factory provided with the furnace. Filters may be field modified by cutting
and folding the frame as indicated on the filter. 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
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.
4. Replace the access doors and restore electrical supply
to the furnace. Be sure bottom door flange is inside of
the furnace casing. (See Fig. 16 and 17.)
5. Start the furnace and observe its operation. If possible,
watch the burner flames. Are they burning bright blue?
If not or if you suspect some other malfunction, call
your servicing dealer.
BEFORE YOU REQUEST A
“SERVICE CALL’’
Before you call for service, check for several
easily solved problems:
• Check for sufficient airflow. Check the air filter for dirt.
Check for blocked return-air or supply-air grilles. Be sure
they are open and unobstructed. If this isn’t the cause of the
problem, call your servicing dealer.
If your furnace isn’t operating at all, check the following list
for easily solved problems:
• Is your thermostat set above room temperature? Is the
switch in the HEAT position?
UPFLOW/HORIZONTAL FURNACE FILTER TABLE (IN.)
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* (2) 12 x 25 x 1 Cleanable
DOWNFLOW
FURNACE FILTER TABLE (IN.)
FURNACE
CASING
WIDTH
FILTER
SIZE
FILTER
TYPE
14-3/16 (2) 14 x 20 x 1* Cleanable
17-1/2 (2) 14 x 20 x 1* Cleanable
21 (2) 16 x 20 x 1* Cleanable
24-1/2 (2) 16 x 20 x 1* Cleanable
WARNING
If holes are found or if the vent pipe is obstructed
or is not connected, toxic fumes can escape into
your home. DO NOT OPERATE YOUR FURNACE.
Call your dealer for service. A failure to follow this
warning could result in personal injury or death.
!
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