Filter
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Air Filter(s) — Air filter(s) should be checked at least
every 3 or 4 weeks and changed or cleaned when necessary.
Table 1 indicates the correct filter size for your unit. See Fig. 4
for filter access door location.
To replace or inspect filters:
1. Lift up and remove filter access panel.
2. While holding filter, tilt upper filter rack.
3. Remove filters by pulling up and out toward you from
the track.
4. Inspect or replace filters.
5. Return filters to filter track. Note direction of airflow ar-
rows on filter frame.
6. Replace filter access panel.
If you have difficulty in locating your air filter, or if you
have questions concerning proper filter maintenance, con-
tact 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.
Units with outdoor air capability have a cleanable filter
for the outdoor air. This filter should be checked annually
and cleaned as necessary with steam or hot water and a mild
detergent. Do not use throwaway filters in place of cleanable
filters.
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.
Table 1 — Indoor-Air Filter Data
UNIT SIZE
48TJ
INDOOR-AIR FILTERS
(Throwaway Fiberglass)
QUANTITY SIZE (in.)
004-007 2 16x25x2
008,009 4 16x20x2
012,014 4 20x20x2
NOTE: Replacement filters should be UL (Underwriters’ Laborato-
ries) certified or equivalent.
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
attempted 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 as-
sembly and the flue collector box cover and, when com-
pleted, reinstalling the gas controls assembly for proper op-
eration. Also, the flue collector box cover must be replaced
correctly so that a proper seal is maintained. Contact your
dealer for the required periodic maintenance.
Fans, Belts and Fan Motor — Periodically check the
condition of the fan wheels and housings, belt tension and
fan motor shaft bearings. No lubrication of condenser or evapo-
rator fan bearings or motors is required or recommended.
Evaporator and Condenser Coils — Cleaning of
the coils should be done by qualified service personnel. Contact
your dealer for the required annual maintenance.
Condensate Drain — The drain pan and condensate
drain line should be checked and cleaned at the same time
the cooling coils are checked by your dealer.
Compressor — All compressors are factory supplied with
a normal charge of the correct type refrigeration-grade oil in
them and should not require additional oil.
Condenser Fan
Do not poke sticks, screwdrivers, or any other
object into revolving fan blades. Severe bodily injury
may result.
The fan must be kept free of all obstructions to ensure
proper cooling. Contact your dealer for any required service.
Electrical Controls and Wiring — Electrical con-
trols are difficult to check without proper instrumentation;
therefore, if there are any discrepancies in the operating cycle,
contact your dealer and request service.
Refrigerant Circuit — The refrigerant circuit is diffi-
cult to check for leaks without the proper equipment; there-
fore, if inadequate cooling is suspected, contact your local
dealer for service.
48TJ004-007 48TJ008-014
Fig.4—Typical Filter Access Panel Location
FILTER ACCESS PANEL
FILTER ACCESS PANEL
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