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TM 5-4120-377-14
TABLE 3-1. TROUBLESHOOTING (cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 6. 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 window, turn selector
to OFF and contact organizational maintenance.
5. REDUCED HEATING 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. If control panel is remotely located, check to be sure that the sensing bulb is not near a light bulb
or some type of heat producing equipment.
Turn off or move heat source.
Step 3. Check operation of TEMPerature control thermostat.
Set control to fully INCREASE; then, if condition improves, adjust properly.
TS4120-377-14/3-T31-12
3-7
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