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TM 9-4120-428-14
0008 00
MALFUNCTION 2
REDUCED COOLING CAPACITY
SYMPTOM
Air conditioner is not cooling properly.
MALFUNCTION
Air conditioner is not cooling properly.
CORRECTIVE ACTION
1. Check that the MODE SELECTOR switch is turned to COOL. If not, turn
the switch to cool at this time.
2. Check the operation of the TEMPERATURE SELECTOR. Set the
maximum control a COOLER; then, if the condition improves, adjust
properly.
3. Check that the supply and air return louvers are properly adjusted. Re-adjust
louvers when necessary.
4. Check that excessive hot, outside air is not entering through the fresh air
damper. If so, fully close the damper and adjust properly when the
condition improves.
5. Check that all doors, windows, and other openings in the room or enclosed
area are tightly closed. Close all openings when necessary.
6. Check the speed of the EVAPORATOR FAN. Set the switch to HIGH
speed.
7. Check the condenser air inlet guard and discharge air louver for obstruction.
Remove obstruction as necessary.
8. Check the condition of the refrigerant in the sight glass. If the refrigerant
color is yellow in color or numerous bubble appear in the window, turn the
selector to OFF and contact direct support maintenance.
0008 00-2

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