TM 9-4120-388-14
Table 4-2. Unit Troubleshooting (Cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 7. Check airflow out of conditioned air (evaporator) discharge grille. if airflow volume is low:
a. Adjust conditioned air (evaporator) intake grille louvers.
b. Clean and service or replace conditioned air filter element. (See para 4-33.)
c. Clean and service, or replace mist eliminator.(see para 4-35.)
d. Clean evaporator coil and entire evaporator system. (See para 4-64.)
Step 8. Check operation of Temperature control thermostat (S2)
a. Inspect sensing bulb and capillary for damage or leakage. (See para 4-39.) Replace entire control if
bulb is damaged or leaking.
b. Test switch in Temperature control thermostat. (See para 4-39.) Replace entire control if defective.
6. REDUCED HEATING CAPACITY.
Step 1. Be sure that all doors, windows, and other openings in the room or enclosure are dosed.
Tightly dose all openings.
Step 2. Check operation of Temperature control thermostat.
Set control to fully INCREASE; then, if condition improves, adjust properly.
Step 3. Be sure the louvers in the conditioned air inlet and outlet grilles are property adjusted.
Adjust louvers properly.
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