TM 9-4120-402-14
Table 3-1. Operator Troubleshooting - continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4.
REDUCED COOLING CAPACITY. - continued
Step 5.
Check that condenser air inlet and outlet are not obstructed.
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/RESET and notify supervisor.
5.
REDUCED HEATING CAPACITY.
Step 1.
Check that all doors, windows, and other openings in room or enclosure are tightly closed.
Tightly close all openings.
Step 2.
Check operation of TEMPERATURE control potentiometer.
Set control to fully WARM then, if condition improves, adjust properly.
3-6
