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TM5-4120-383-14
Table 3-1.
OPERATOR TROUBLESHOOTING-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Check operation of TEMPERATURE SELECTOR.
Set control at maximum COOLER, then, if
condition improves, adjust properly.
Step 3.
Check that supply and return air louvers are
properly adjusted.
Adjust louvers properly.
Step 4.
Check that excessive hot, outside air is not being
introduced through fresh air damper.
Fully close damper, then, if condition improves,
adjust properly.
Step 5.
Check that all doors, windows, and other openings
in room or enclosure are tightly closed.
Tightly close all openings.
Step 6.
Check if EVAPORATOR FAN SPEED switch is set at LOW
speed.
Set switch to HIGH speed.
Check that condenser air inlet guard or discharge
Step 7.
air louver are not obstructed.
Remove obstruction.
Step 8.
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 direct support maintenance.
3. REDUCED HEATING CAPACITY.
Step 1.
See that MODE SELECTOR switch is properly set.
Set switch on LOW or HIGH HEAT.
3-3

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