Carrier 48HJ004-014 specifications Heat Exchanger

Heat Exchanger

NOTE: To ensure dependable and efficient heating operation, the heat exchanger should be checked by a qualified mainte- nance person before each heating season, and cleaned when necessary.

This checkout should not be attempted by anyone not hav- ing 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. When finished, the gas controls must be reinstalled 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. At the beginning of each cooling/heating season and as conditions require.

Fans and Belts, and Fan Motor — Periodically check the condition of fan wheels and housings, belt tension and fan motor shaft bearings. No lubrication of condenser or evapora- tor fan bearings or motors is required or recommended.

Evaporator and Condenser Coils — Cleaning of the coils should be done by qualified service personnel. Con- tact you 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 could result.

The fan must be kept free of all obstructions to ensure prop- er cooling. Contact your dealer for any required service.

Electrical Controls and Wiring — Ensure wires do not contact refrigerant tubing or sharp edges. Electrical con- trols are difficult to check without proper instrumentation. If in- adequate cooling is suspected, contact your qualified local dealer for service.

Combustion Area and Vent System — The com- bustion area and vent system should be visually inspected be- fore each heating season. The normal accumulation of dirt, soot, rust, and scale can result in loss of efficiency and improp- er performance if allowed to build up.

If your unit makes any unusual or especially loud noises during heating, shut down the heating section and call your qualified Carrier service technician.

See Fig. 1A, 1B, 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; install lockout tag.

3.Remove compressor access panel.

4.Using a flashlight, carefully inspect the burner areas for dirt, soot, or scale.

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.

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. Serious injury could 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 compressor 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.

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