6
20
PERFORMING
ROUTINE
MAINTENANCE
With proper maintenance and care,
your furnace will operate econom-
ically 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 maintenance, 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 auto-
matically shut down. The furnace
filter should be checked every 3 or 4
weeks and cleaned if necessary.
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.
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.
!
!
The air filter for upflow furnaces is
normally located in the blower com-
partment. Filters for the downflow
furnaces are normally located in the
return-air plenum above the blower.
If the filters have been installed in
another location, contact your dealer
for instructions. To inspect, clean
and/or replace the air filter(s), follow
these steps:
• UPFLOW FURNACES ONLY—
1. Turn off electrical supply to
the furnace. (See Fig. 19.)
2. Remove control and blower
access doors. (See Fig. 11.)
3. Push filter retainer toward the
bracket opening to release the
filter. (See Fig. 21.)
4. Gently remove the filter and
carefully turn the dirty side up
(if dirty) to avoid spilling dirt
from the filter. (See Fig. 22.)
5. Inspect the filter. If torn, re-
place 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 deter-
gent 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.
7. Reinstall the clean filter with
the cross-mesh binding (when
present) side facing the furnace
blower.
8. Put filter retainer back in the
bracket opening and lock it in
place.
9. Replace blower and control
access doors and turn on electri-
cal supply to the furnace. (See
Fig. 23, 14, and 16.)
NOTE: For upflow models only—Two
filters may be required in some mod-
els if side return ducts are used. The
producedure listed above may be used
to remove side filters.
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.
!
21
22
23
24 25
• 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. 24.)
1. Turn off electrical supply to
furnace. (See Fig. 19.)
2. Remove 2 screws from blower
access door and remove door.
To Next Page
Loading...
