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7
1. Turn off electrical supply to furnace. (See Fig. 11.)
2. Remove blower access door in rear of furnace. (See
Fig. 13.) Lift door up, then out using handle on
blower access door.
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3. Remove air filters from furnace.
a. Remove filter resting in filter rack at an angle in
front of blower first. Slide filter back to clear filter
rack ends then lift up and out of filter rack and
blower compartment. (See Fig. 14.)
b. Remove second filter lying above blower. Slide
filter toward rear of furnace and out of blower
compartment. (See Fig. 15.)
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4. Inspect the filter. If torn, replace it.
NOTE:
If filter that was shipped with furnace has
been replaced with an electronic air cleaner (EAC),
refer to the EAC Owner’s Manual for maintenance
information.
5. The filters shipped with the furnace are disposable.
If they are dirty, they must be replaced. If your fur-
nace air filters need to be replaced, be sure to use the
same size and type of filter that was originally sup-
plied. Use the furnace filter table and compare your
furnace size with the proper filter size.
FURNACE AIR FILTER TABLE
If you have replaced the factory-provided disposable
filters with permanent washable filters, they may be
cleaned if they are dirty. Wash filters in a sink, bathtub,
or outside with a garden hose. Always use cold tap
water. A mild liquid detergent may be used if neces-
sary. Spray water through filter in the opposite direc-
tion of airflow. Allow filter to dry.
6. Reinstall clean air filters by reversing procedure in
item 3 above.
7. Replace blower access door. (See Fig. 16.)
8. Turn on electrical supply to furnace.
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A CHECK-UP CHECKLIST
Your furnace represents an important investment in
your family’s comfort and your home’s value. To keep
it performing properly and as a preventative to future
problems, have a trained service specialist give your
furnace a professional check-up annually. The fol-
lowing checklist can be used as a guideline to proper
service:
• Check flue and secondary tube passage ways including
chimney — clean if necessary.
• Change oil filter.
• Change nozzle.
• Check and adjust combustion and draft.
• Inspect all vent piping inside structure for deterioration
and vent terminations outside the structure for blockage.
• Check oil pipes leading to and inside of your furnace
for leaks.
• Inspect and clean the blower motor and wheel.
• Inspect and change or clean air filters if necessary.
• Inspect all supply- and return-air ducts for obstruc-
tions, air leaks, and insulation. Remedy any problem
when necessary.
FURNACE
CASING
DEPTH
(IN.)
FILTER
QUANTITY
AND SIZE
(IN.)
FILTER
TYPE
53-3/4 (2) 12 X 20 X 1 Disposable
60-5/32 (2) 16 X 20 X 1 Disposable
A04125
2
1
1
2
2
1