5
Air Filter(s) —
Air filter(s) should be checked monthly
and changed when necessary. Units may have either 2-in. or
4-in. thick filters. For units with 2-in. thick filters, all filters will
be 20 x 24 x 2-in. size. For units with 4-in. thick filters, filters
may be 20 x 24 x 4-in. size or 20 x 20 x 4-in. size. The filter ac-
cess panel is located at the end of the unit opposite of the con-
denser section. The access door is labeled to indicate that it is
the filter access door. Units with energy conservation wheel
will have additional filters which must also be replaced.
To replace or inspect filters:
1. Loosen the 3 latches securing the filter access door (and
optional energy conservation wheel section door if in-
stalled) and open door. See Fig. 1.
2. Remove filters by pulling filter out toward you and away
from the filter track.
3. Inspect or replace filters.
4. Return filters to filter tracks. Note direction of airflow
arrows on filter frame.
5. Close filter access panel and tighten latches.
If you have difficulty in locating your air filter or if you
have questions concerning proper filter maintenance, contact
your dealer for instructions. When replacing your unit filters,
always use the same size and type of filter that was originally
supplied by the installer.
Heat Exchanger —
To ensure dependable and efficient
heating operation, the heat exchanger should be checked by a
qualified maintenance person before each heating season and
cleaned when necessary. This checkout should not be attempt-
ed by anyone not having the required expertise and equipment
to do the job properly. Checking and/or cleaning the heat
exchanger involves removing the gas controls assembly, the
flue collector box, and the flue collector box cover. When
finished, the gas controls assembly must be reinstalled for
proper operation. Also, the flue collector box cover must be
replaced correctly so that a proper seal is maintained. Refer to
unit installation instructions for correct procedure. Contact
your dealer for the required periodic maintenance.
Fans and Belts —
Periodically check the condition of
the fan wheels and housings, and belt tension. When service is
necessary, call your dealer.
STEP 1
Fig. 4 — To Shut Unit Off
STEP 5
STEP 4
STEP 3
STEP 2
STEP 6
a48-924tf
a48-925tf
N
A
T N
A
T
ON
OFF
WARNING
Never operate your unit without filters in place. Failure to
heed this warning may result in damage to the blower
motor and/or compressor. An accumulation of dust and lint
on internal parts of your unit can cause loss of efficiency
and, in some cases, fire.
