6
20
21
3. Push filter retainer toward the
bracket opening to release the filter.
(See Fig. 20.)
22
4. Gently remove the filter and care-
fully turn the dirty side up (if dirty)
to avoid “spilling’’ dirt from the
filter. (See Fig. 21.)
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. 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 the blower door and
control access door and turn ON
electrical power to your furnace.
(See Fig. 22 and 13.)
NOTE:
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.
FURNACE FILTER TABLE
*
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. 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 servicing dealer.
Use your flashlight and follow these
steps for inspecting the combustion
area and vent system of your
furnace:
1. Turn off the gas and electrical sup-
plies to the furnace and remove the
access doors. (See Fig. 6, 7, and 8.)
2. Carefully inspect the gas burner
(see Fig. 23) for dirt, rust, or scale.
Then inspect the inducer, vent con-
nection area, and the vent pipe for
rust.
NOTE:
If dirt, rust, soot, or scale accu-
mulations are found, call your servic-
ing dealer. DO NOT OPERATE THE
FURNACE.
3. Inspect the vent pipe for a sag,
holes, or a disconnection. A hori-
zontal vent pipe must slope upward
away from the furnace. If rusty
joints or seams, or signs of water
leakages are found call your dealer
for service.
23
4. Replace the access doors and re-
store gas and electrical supplies to
the furnace. Be sure bottom door
flange is inside of the furnace cas-
ing. (See Fig. 22, 13, 14, and 15.)
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 sur-
rounding the furnace. Check the air fil-
ter for dirt. Check for blocked return-
air or supply-air grilles. Be sure they
are open and unobstructed. If this isn’t
the cause, 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 HEAT mode
selected?
• Is the electrical power supply switch
ON? Is the blower access door firmly in
place? Are any fuses blown? (There is
FURNACE
CASING
WIDTH
FILTER SIZE
FILTER
TYPE
Side Return
Bottom
Return
14-3/16
(1)16x25x1* (1)14x25x1
*
Cleanable
17-1/2
(1)16x25x1* (1)16x25x1
*
Cleanable
21
(1)16x25x1
*
(1)20x25x1*
Cleanable
24-1/2
(2)16x25x1* (2)12x25x1
*
Cleanable
WARNING
If holes caused by deteriora-
tion are found—or holes in the
vent pipe—or if the vent pipe is
obstructed or is not connect-
ed—toxic fumes can escape
into your home. DO NOT OP-
ERATE YOUR FURNACE. Call
your dealer for service. A fail-
ure to follow this warning
could result in personal injury
or death.
!
