TM 9-4120-408-14
Table 4-4. Unit Troubleshooting Table. (continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3 Insufficient Cooling Capacity. (Continued)
WARNING
Serious damage may result to compressor if liquid enters compression chamber. It is indicated by
liquid/moisture indicator showing wet condition or bubbles in the sight glass.
If liquid/moisture indicator shows wet condition or numerous bubbles appear in refrigerant, immediately turn air
conditioner OFF and notify your direct support maintenance.
4. High Pressure Warning Light on Control Module is Lit.
Inspect refrigerant out line from condenser assembly for damage or kinks which could cause a restriction in refrigerant
flow.
a. Ensure condenser inlet and outlet are not obstructed.
b. Adjust refrigerant out line to remove kinks or restrictions.
c. Remove upper access panel (paragraph 4-10) and reset high pressure cut out switch.
d. Notify direct support maintenance.
5. Low Pressure Warning Light on Control Module is Lit.
Notify direct support maintenance.
6. Air Filter Warning Light on Control Module is Lit.
c. Notify direct support maintenance.
7. Condensate Drain Warning Light on Control Module is Lit.
Remove front (air inlet) EMI/RFI ventilation panel (paragraph 4-29) and inspect condensate drain pan for water build up.
WARNING
Wear eye protection when using compressed air. Air pressure should not exceed 30 pounds per
square inch (psi) (206.7 kilopascals (kPa)). Personal injury may result if eye protection is not used.
a. Back flush condensate drain line using compressed air.
4-10