REDUCED COOLING CAPACITY. - TM-5-4120-393-140095

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.

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