Filter
Top Products
6
6.
Replace
the outer door. (See Fig.
11.)
7. If the furnace is being shut down
because of a malfunction,
call
your
dealer as soon as possible.
PERFORMING
ROUTINE
MAINTENANCE
With the proper maintenance and care,
your furnace will operate economically
and dependably. Basic maintenance,
which can easily be accomplished by
someone who follows the directions, is
found on this and the following pages.
However, before beginning mainte-
nance, follow these safety precautions:
FILTERING OUT
TROUBLE
.
A dirty filter will cause excessive stress
on the furnace blower motor and can
cause it to overheat and automatically
shut down. The furnace filter should be
checked every 4 weeks or so and
cleaned or replaced if necessary.
If installed with factory specified dis-
posable media filter, check or replace
filter before each heating and cooling
season. Replace disposable media filter
at least twice a year.
If your furnace filter needs replacing, be
WARNING
Turn off electrical power sup-
ply to your furnace before re-
moving the access doors to
service or perform mainte-
nance. A failure to follow this
warning could result in per-
sonal injury or death.
CAUTION
Although special care has
been taken to minimize sharp
edges, be extremely careful
when handling parts or reach-
ing into the furnace.
CAUTION
Never operate your furnace
without a filter in place. Doing
so may damage the furnace
blower motor. An accumula-
tion of dust and lint on internal
parts of your furnace can
cause a loss of efficiency.
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sure to use the same size and type of fil-
ter that was originally specified The
air
filter may be located in the filter cabinet
attached to the side or bottom of the
furnace.
If air filter has been installed in another
location, contact your dealer for instruc-
tions. To inspect, clean, and/or replace
the air filter(s), follow these steps:
1. Turn off electrical supply to fur-
nace (See Fig. 7.)
2. Remove filter cabinet door (See
Fig. 18 and 19.)
NOTE:
It may be necessary to re-
move 1 thumbscrew
3. Slide air filter out of filter cabinet.
Keep dirty side up (if dirty) to avoid
spilling dirt. (See Fig. 20 and 21.)
4. Inspect the filter. If torn, replace it.
NOTE:
If a washable filter has been re-
placed by:
a) Factory specified disposable media
filter – Do not clean. If dirty, replace only
with media filter having the same part
number and size. Install with airflow di-
rection arrow pointing towards blower.
b) Electronic air cleaner (EAC) – Re-
fer to EAC Owner’s Manual for mainte-
nance information.
5. Wash filter (if dirty) in sink, bath-
tub, or outside with a garden hose.
Always use cold tap water. A mild
liquid detergent may be used if nec-
essary. Spray water through filter in
the opposite direction of airflow.
Allow filter to dry.
6. Reinstall clean air filter.
7. Replace filter cabinet door. (See
Fig. 22 and 23.)
8. Turn on electrical supply to furnace
(See Fig. 12.)
* Recommended ** Some furnaces may have 2 filters
Filters may be field modified by cutting filter material
and support rods (3) in filters. Alternate sizes and addi-
tional 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.
NOTE:
If your furnace makes a loud
noise when the main burners are ig-
nited, 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 electrical supply to the
furnace and remove the access
door. (See Fig. 7 and 8.)
2. Carefully inspect the gas burner
(See Fig. 17) for dirt, rust, or scale.
FURNACE
CASING
WIDTH
FILTER QUANTITY
AND SIZE
**
FILTER
TYPE
*
SIDE
RETURN
BOTTOM
RETURN
14-1/2 (1) 16 x 25 (1) 14 x 25 1” thick,
cleanable or
4-5/16” thick
media-type
17-1/2 (1) 16 x 25 (1) 16 x 25 1” thick,
cleanable or
4-5/16” thick
media-type
21 (1) 16 x 25 (1) 20 x 25 1” thick,
cleanable or
4-5/16” thick
media-type
24 (1) 16 x 25 (1) 24 x 25 1” thick,
cleanable or
4-5/16” thick
media-type
CAUTION
Use care when cutting support
rods in filters to protect
against flying pieces and
sharp rod ends. Wear safety
glasses, gloves, and appropri-
ate protective clothing. Failure
to follow this caution could re-
sult in personal injury.
WARNING
For proper and safe operation
the furnace needs air for com-
bustion and ventilation. Do not
block or obstruct air openings
on the furnace, air openings to
the area in which the furnace is
installed, and the space around
the furnace.
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 FUR-
NACE. Call your dealer for ser-
vice. A failure to follow this
warning could result in per-
sonal injury or death.
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