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Manafacture: Carrier File size: 525.32 kb File name: Language of manual:

S. 50 60 70 80 STEP 1 STEP 4 48D J D, LJ D005-009 48D J E, LJ E004-007 48DJD.LJD012,014 48DJE.LJE008-012 STEP 5 Fig. 3 — To Shut Unit Off 4 48DJD.DJE Fig. 4 — Filter Access Door/Panel Location 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 assembly and the flue collector box cover and, when completed, reinstalling the gas controls assembly for proper operation. 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 evaporator 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 shipped with a normal charge of the correct type of refrigeration-grade oil in them and should not require additional oil. Condenser Fan A WARNING 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 controls 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 difficult to check for leaks without the proper equipment; therefore, if inadequate cooling is suspected, contact your local dealer for service. Combustion Area and Vent System — The combustion area and vent system should be visually inspected before each heating season. The normal accumulation of dirt, soot, rust, and scale can result in loss of efficiency and improper performance if allowed to build up. A CAUTION If your unit makes any unusual or especially loud noises during heating, shut down the heating section and call your dealer. See Fig. 4 and 5 and proceed as follows to inspect the combustion area and power-venting system of your unit. 1. Turn off gas supply to your unit. 2. Turn off electrical power to your unit. 3. Remove burner compartment access panel. 4. Using a flashlight, carefully inspect the burner areas for dirt, soot, rust or scale. A CAUTION If dirt, soot, rust, or scale accumulations are found, call your dealer and do not operate your heating section. 5. When you have completed your inspection, follow the start-up procedures in this manual to restore your unit to operation. 6. Observe unit heating operation. A WARNING Components in heat section may be hot after unit has been started up. When observing flame, be careful not to get close to or touch heating components or serious personal injury may result. Watch the burner flame to see if it is bright blue. If you observe a suspected malfunction or that the burner flame is not bright blue, call your dealer. 7. Replace burner compartment access panel. Unit Panels — After performing any maintenance or service on the unit, be sure all panels are securely fastened in place to prevent rain from entering unit cabinet and to prevent disruption of the correct unit airflow pattern. 5 INDUCED-DRAFT BLOWER INDUCED-DRAFT MOTOR GAS VALVE a. 48DJD005-007, 48DJE,LJE004-007, 48LJD004-007 INDUCED-DRAFT BLOWER INDUCED-DRAFT MOTOR GAS VALVE (HIDDEN) REGULAR DEALER MAINTENANCE In addition to the type of routine maintenance you might be willing to perform, your unit should be inspected re...

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