TM9-4120-402-14
5-19. OVERHEATING CHECKS.
This task covers:
Examine
INITIAL SETUP
Equipment Condition
Unit operating in full COOL.
Examine.
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.
(d)
Turn rotary MODE selector switch to OFF/RESET.
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