TM 9-4120-405-13&P
Table 3-1. Operator Troubleshooting. (Cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 5. Check that condenser air inlet guard or discharge air louver are not obstructed.
Remove obstruction.
Step 6. Check condition of refrigerant in sight glass.
If refrigerant color is in the yellow zone or numerous bubbles appear in window, turn selector to OFF and
contact your supervisor.
3.
Step 1. See that MODE SELECTOR switch is properly set.
Set switch on LOW or HIGH HEAT.
Step 2. Check operation of TEMPERATURE SELECTOR switch.
Set control to fully WARMER then, if condition improves, adjust properly.
Step 3. Check that all doors, windows, and other openings in shelter are tightly closed.
Tightly close all openings.
4.
TOO MUCH HEAT.
Step 1. See that MODE SELECTOR switch is properly set.
Set switch on LOW HEAT. (When MODE SELECTOR switch is set for HIGH HEAT, half of the heaters will
operate all of the time.)
Step 2. Check operation of TEMPERATURE SELECTOR switch.
Adjust to a slightly COOLER setting.
5.
ENGINE FAILS TO CRANK WHEN MASTER SWITCH IS HELD IN THE START POSITION.
Step 1. Check to see that DC CONTROL CIRCUIT on the control panel is set.
Set circuit breaker. If circuit breaker will not stay set, notify supervisor.
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