6
22 23
4. Remove the control access door on your furnace. (See
Fig. 10 or 11.) On upflow furnaces, removing the blower
access door is not required.
5. Turn the control knob or switch on the gas valve to the
OFF position. (See Fig. 22 or 23.)
6. Replace the control access door. (See Fig. 16 or 17.)
7. If the furnace is being shut down because of a malfunc-
tion, call your dealer as soon as possible.
PERFORMING ROUTINE
MAINTENANCE
With 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 begin-
ning maintenance, follow these safety precautions:
FILTERING OUT TROUBLE
A dirty filter will cause excessive stress on the furnace, heat
exchanger, and blower motor and can cause it to overheat
and automatically shut down. The furnace filter should be
checked every 3 or 4 weeks and cleaned if necessary.
If installed with factory specified disposable media filter,
check or replace filter before each heating and cooling sea-
son. Replace disposable media filter at least once a year.
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 normally located in the
blower compartment. (See Fig. 3) or in the factory-supplier
filter cabinet attached to the side or bottom of the blower cab-
inet. Filters for the downflow furnaces are normally located
in the return-air plenum above the blower. 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:
•
Upflow Furnaces Only—
1. Turn off the electrical supply to the furnace. (See
Fig. 21.)
2. Remove door/access panel
• AIR FILTER(S) LOCATED IN BLOWER COMPART-
MENT
Remove control and blower access doors. (See Fig. 11)
• AIR FILTER LOCATED IN FILTER CABINET
Remove filter cabinet door (See Fig. 30 and 31)
NOTE: It will be necessary to remove 1 thumbscrew
24 25
3. Remove air filter from furnace.
• AIR FILTER LOCATED IN BLOWER COMPART-
MENT:
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 FILTER CABINET:
a. Slide air filter out of furnace. Keep dirty side up (if
dirty) to avoid spilling dirt. (See Fig. 32 and 33)
4. Inspect the filter. If torn, replace it.
26
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 having 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.
WARNING
Turn off electrical power supply to your furnace
before removing the access doors to service or
perform maintenance. A failure to follow this
warning could result in personal injury or death.
CAUTION
Although special care has been taken to minimize
sharp edges, be extremely careful when handling
parts or reaching into the furnace.
CAUTION
Never operate your furnace without a filter in place.
Doing so may damage the furnace blower motor.
An accumulation of dust and lint on internal parts
of your furnace can cause a loss of efficiency.
F
F
O
O
F
F
M
C
HI
ON
O
F
F
!
!
!
To Next Page
Loading...
