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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 de-
tergent 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 its cross-mesh binding side
facing the furnace blower.
8. Put filter retainer back in the bracket opening and lock it in
place.
9. Replace the blower and control access doors and turn ON
electrical power to your furnace. (See Fig. 12 and 17.)
NOTE: If side return ducts are used, two filters may be required
in some models. The procedure listed above may be used to re-
move side filters.
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 or pilot assembly 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
by the pilot, shut down the furnace—call your servicing dealer.
Refer to the lighting instructions label on the blower door for
shutdown procedures.
UPFLOW FURNACE FILTER TABLE
FURNACE
FILTER SIZE
CASING
WIDTH
Side Return Bottom Return
14-3/16
(1) 16 x 25 x 1 * (1) 14 x 25 x 1
17-1/2
(1) 16 x 25 x 1 * (1) 16 x 25 x 1
21
(1) 16 x 25 x 1
24-1/2
(2) 16 x 25 x 1 * (1) 24 x 25 x 1
* Factory provided with the furnace. Filter may be field modified by cut-
ting as required. Alternate sizes and additional filters may be ordered
from your 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. 6 and 7.)
2. Carefully inspect the gas burner (See Fig. 18) for dirt, rust,
or scale. Then, inspect the relief box, flue connection area,
and the vent pipe for rust.
FILTER TYPE
Cleanable
*
*
Cleanable
(1) 20 x 25 x 1 *
Cleanable
*
Cleanable
*
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 disconnection. A
horizontal vent pipe must slope upward. If rusty joints or
seams, or signs of water leakages are found call your dealer
for service.
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.
4. Replace the access doors and restore electrical power to the
furnace. Be sure bottom door flange is inside of the furnace
17
casing. (See Fig. 12 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.
M
Check for blocked return-air or supply-air grilles. Be sure they
are open and unobstructed. If this isn't the cause, call your ser-
vicing 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
M
switch in the HEAT position?
Is the electrical power supply switch ON? Is the blower
M
access door firmly in place? Are any fuses blown—has a
circuit breaker tripped? (There is a fuse on the furnace control
board.)
Is the manual shut-off valve in the gas supply pipe leading
M
to the furnace open? Does the lever point in the same direction
that the pipe runs (open)? Or is it at right angles (closed)?
NOTE: Before proceeding with the next checks, turn OFF the
electrical power supply to the furnace. Remove the control ac-
cess door. The blower access door must be installed to permit
furnace operation. On downflow furnaces, the blower access
door must be removed before the control access door is removed,
then reinstalled.
—7—
WARNING
!
18
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