Filter
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7
If your furnace filter needs replacing,
be sure to use the same size and type
of filter that was originally supplied.
Use the Furnace Filter Table and
match your furnace size with the
proper filter size
.
The air filter for upflow furnaces is nor-
mally located in the blower compart-
ment (See Fig. 2) or in the factory-
supplier filter cabinet attached to the
side or bottom of the blower cabinet.
Filters for the downflow furnaces are
normally located in the return-air ple-
num above the blower. If air filter has
been installed in another location, con-
tact your dealer for instructions. To in-
spect, clean, and/or replace the air
filter(s), follow these steps:
•
UPFLOW
FURNACES ONLY—
1. Turn off electrical supply to fur-
nace. (See Fig. 21)
2. Remove door/access panel
• AIR FILTER(S) LOCATED IN
BLOWER COMPARTMENT
Remove control and blower access
doors. (See Fig. 11)
• AIR FILTER LOCATED IN FIL-
TER CABINET
Remove filter cabinet door (See
Fig. 30 and 31)
NOTE: It will be necessary to
remove 1 thumbscrew
3. Remove air filter from furnace.
• AIR FILTER LOCATED IN
BLOWER COMPARTMENT:
a. Slide filter retainer sideways
until it is free of latch. (See Fig. 24)
b. Gently remove air filter and
carefully turn the dirty side up (if
dirty) to avoid spilling dirt from
the filter. (see Fig. 25)
• AIR FILTER LOCATED IN FIL-
TER CABINET:
a. Slide air filter out of furnace.
Keep dirty side up (if dirty) to avoid
spilling dirt. (see Fig. 31 and 32)
4. Inspect the filter. If torn, replace it.
NOTE:
If washable filter that was
shipped with the furnace has been
replaced by:
a. Factory specified disposable
media filter – Do not clean. If dirty,
replace only with media filter hav-
ing the same part number and size.
Install with airflow direction arrow
pointing towards blower.
b. Electronic air cleaner (EAC) –
Refer to EAC owner’s Manual for
maintenance 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
necessary. Spray water through fil-
ter in the opposite direction of air-
flow. Allow filter to dry.
6. Reinstall clean air filter
7. Reinstall filter retainer (for blower
compartment locations only)
8. Replace control and blower doors
(See Fig. 26 and 16) or filter cabi-
net door (fig. 32 and 33)
9. Turn on electrical supply to fur-
nace (see Fig 18).
NOTE:
For upflow models only—Two
filters may be required in some mod-
els if side return ducts are used. The
procedure listed above may be used to
remove side filters.
24
25’
26
•
DOWNFLOW/HORIZONTAL
FURNACES ONLY—
Two filters are located in the return-air
plenum above the blower (above line-
of-sight) resting in the V-shaped chan-
nel on top of the furnace. (See Fig. 27.)
1. Turn off electrical supply to
furnace. (See Fig. 21.)
2. Remove 2 screws from blower
access door and remove door.
3. Remove the left-side filter by tip-
ping 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 next to the
blower and remove from 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 clean filters.
27 28
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.
!