ROUTINE MAINTENANCE
All routine maintenance should be handled by skilled, ex-
perienced personnel. Your dealer can help you establish a
standard procedure.
For your safety, keep the unit area clear and free of com-
bustible materials, gasoline, and other flammable liquids and
vapors.
To assure proper functioning of the unit, flow of combus-
tion and ventilating air must not be obstructed from reaching
the unit. Clearance of at least 30 in. is required on all sides
except the duct side.
MAINTENANCE AND CARE FOR THE
EQUIPMENT OWNER
Before proceeding with those things you might want to
maintain yourself, please carefully consider the following:
1. TURN OFF GAS SUPPLY AND ELECTRICAL
POWER TO YOUR UNIT BEFORE SERVICING
OR PERFORMING MAINTENANCE.
2. Do not turn off electrical power to this unit without
first turning off the gas supply.
3. When removing access panels or performing main-
tenance functions inside your unit, be aware of sharp
sheet metal parts and screws. Although special care
is taken to reduce sharp edges to a minimum, be ex-
tremely careful when handling parts or reaching into
the unit.
Air Filters —
Air filter(s) should be checked at least ev-
ery 3 or 4 weeks and changed or cleaned whenever it be-
comes dirty. Dirty filters produce excessive stress on the blower
motor and can cause the motor to overheat and shut down.
Table 1 indicates the correct filter size for your unit. Refer
to Fig. 5 to access the filter(s).
To replace or inspect filter(s) (or accessory filter rack when
supplied):
1. Remove the filter access panel using a
5
⁄
16
-in. nut driver.
2. Remove the filter(s) by pulling the filter(s) out of the unit.
If the filter(s) is dirty, clean or replace with new one.
When installing the new filter(s), note the direction of the
airflow arrows on the filter frame.
If you have difficulty in locating your air filter(s), or if
you have questions concerning proper filter maintenance, con-
tact your dealer for instructions. When replacing filters, al-
ways use the same size and type of filter that was supplied
originally by the installer.
Table 1 — Indoor-Air Filter Data
UNIT SIZE
48SS
018-024
030-036
042
048-060
Filter Size
20 x 20
20 x 24
24 x 24
24 x 30
UNIT SIZE
48SX
024-036
042-060
Filter Size
24 x 24
24 x 30
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 ef-
ficiency and, in some cases, fire.
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