OVERHEATING CHECKS

TM 9-4120-428-14

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DIRECT SUPPORT MAINTENANCE

AIR CONDITIONER, HORIZONTAL, COMPACT

(NSN 4120-01-502-1319)

OVERHEATING CHECKS

INITIAL SETUP:

Equipment Condition

Unit operating in full COOL mode.

EXAMINATION

NOTE

Bubbles appearing in the sight glass OR a reduction in the cooling capacity is often

caused by an overheated refrigeration system. Adequate cooling of the hot, compressed

refrigerant vapor in the condenser is essential to the proper operation of the air

conditioner.

Painting coils wi ll cause overheating, thereby reducing the cooling capacity.

The following checks should be made to ensure that overheating is not the cause of the symptoms prior to troubleshooting the

pressurized portion of the refrigeration system.

Be sure there is no external obstruction to the airflow into the condenser intake screen and out of the condenser fan

guard.

b) Be sure there is no obstruction within the intake screen and fan guard.

c) Be sure there are no obstructions or an excessive build-up of dust or dirt in the condenser coil.

NOTE

FOLLOW-ON MAINTENANCE:

Turn the unit OFF

END OF WORK PACKAGE

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