Carrier Essential Maintenance Tips for Heating Systems

Air Filter(s) Ð Air ®lter(s) should be checked at least every 3 or 4 weeks and changed or cleaned when necessary. Table 1 indicates the correct ®lter size for your unit. See Fig. 4 for ®lter access door location.

To replace or inspect ®lters:

1.Lift up and remove ®lter access panel.

2.While holding ®lter, tilt upper ®lter rack.

3.Remove ®lters by pulling up and out toward you from the track.

4.Inspect or replace ®lters.

5.Return ®lters to ®lter track. Note direction of air¯ow ar- rows on ®lter frame.

6.Replace ®lter access panel.

If you have difficulty in locating your air ®lter, or if you have questions concerning proper ®lter maintenance, con- tact your dealer for instructions. When replacing your unit ®lters, always use the same size and type of ®lter that was originally supplied by the installer.

Units with outdoor air capability have a cleanable ®lter for the outdoor air. This ®lter should be checked annually and cleaned as necessary with steam or hot water and a mild detergent. Do not use throwaway ®lters in place of cleanable ®lters.

Never operate your unit without ®lters 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- ®ciency and, in some cases, ®re.

Table 1 Ð Indoor-Air Filter Data

UNIT SIZE	INDOOR-AIR FILTERS
	(Throwaway Fiberglass)
48TJ
	QUANTITY	SIZE (in.)
004-007	2	16 x 25 x 2
008,009	4	16 x 20 x 2
012,014	4	20 x 20 x 2

NOTE: Replacement ®lters should be UL (Underwriters' Laborato- ries) certi®ed or equivalent.

FILTER ACCESS PANEL

Heat Exchanger Ð To ensure dependable and efficient heating operation, the heat exchanger should be checked by a quali®ed 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 ¯ue collector box cover and, when com- pleted, reinstalling the gas controls assembly for proper op- eration. Also, the ¯ue 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 Ð 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 Ð Cleaning of the coils should be done by quali®ed service personnel. Contact your dealer for the required annual maintenance.

Condensate Drain Ð 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 Ð 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 Ð 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 Ð 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.

FILTER ACCESS PANEL

48TJ004-007 48TJ008-014

Fig. 4 Ð Typical Filter Access Panel Location

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