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TM 5-4120-377-14
Table 4-2. TROUBLESHOOTING (Cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 4. With unit operating in COOL mode, check condition of refrigerant in sight glass.
If indicator color is in the yellow zone or numerous bubbles appear in the window, turn
selector switch to OFF and contact direct support maintenance.
Step 5. Reset (PUSH) PRESSURE CUT-OUT switch(s) and restart unit.
If unit does not start contact direct support maintenance.
5. REDUCED COOLING CAPACITY.
Step 1. Check that all doors, windows, and other openings in the room or enclosure are tightly closed.
Tightly close all openings.
Step 2. Check operation of TEMPerature control thermostat.
Set control at maximum DECREASE; then, if condition improves, adjust properly.
TS4120-377-14/4-T42-10
4-44
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