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TM 5-4120-393-14
Table 4-2. Unit Maintenance Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
12. REDUCED COOLING CAPACITY.
Step 1.
Check condition of refrigerant displayed in sight glas s.
a. If indicator color is yellow or light chartreuse, or if numerous bubbles appear, turn air
conditioner OFF, and contact Intermediate Direct Support Maintenance for refrigeration
system servicing.
b. If indicator color is green or a dark chartreuse, or if refrigerant has a milky appearance,
or more than an occasional bubble appears, thoroughly clean the condenser intake screen,
condenser fan guard, condenser coil, and entire condenser section to remove all
obstruc tions.
Step 2.
Check air flow out of conditioned air (evaporator) discharge grille. If air flow volume is low:
a. Adjust conditioned air (evaporator) intake grille louvers.
b. Clean and service, or replace, conditioned air filters. (See para 4-30.)
c. Clean and service, or replace, mist eliminator. (See para 4-32.)
d. Clean evaporator coil and entire evaporator section. (See para 4-62.)
Step 3.
Check adjustment of fresh air damper and/or CBR filter if installed.
Adjust properly.
Step 4.
Check operation of TEMPerature control thermostat (S1).
a. Inspect sensing bulb and capillary for damage or leakage. Replace entire control if bulb
is damaged or leaking.
b. Test switch in TEMPerature control thermostat (S1). (See para 4-37.) Replace entire
control if defective.
Step 5.
Contact Intermediate Direct Support Maintenance for refrigeration system troubleshooting.
4-43

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