TM9-4120-400-14
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OVERHEATING CHECKS.
This task covers:
Examination
INITIAL SETUP
Equipment
Condition
Unit operating in full cool.
EXAMINATION
NOTE
Bubbles appearing in the sight glass or a reduction in cooling capacity is often caused by
the refrigeration system being overheated. Adequate cooling of the hot, compressed,
refrigerant vapor in the condenser is essential to the proper operation of the air
conditioner.
Painting coils will cause overheating and reduce cooling capacity.
The following checks should be made to ensure that overheating is not the cause of the symptoms before
troubleshooting the pressurized portion of the refrigeration system:
a. Be sure there is no external obstruction to air flow 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 and dirt in the condenser coil.
NOTE
FOLLOW-ON MAINTENANCE:
Turn unit OFF.
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