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ARMY TM 9-4120-381-14
NAVY EE-000- CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
Table 4-2. Unit Maintenance Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
11. LOW OIL PRESSURE LIGHT (DS6) ON.
Step 1. Check operation of low oil pressure relay (K4).
Test relay (para 4-49). Replace relay, if defective.
Step 2. Check operation of relay (v(4) 11-pin socket.
Test socket (para 4-50). Replace socket, if defective.
Step 3. Check operation of suppression diode (CR9).
Test diode (para 4-47). Replace diode, if defective.
Step 4. Check operation of low oil pressure switch (S7).
To test switch contact Direct Support Maintenance.
Step 5. Check operation of time delay relay (K22).
Test relay (para 4-54). Replace relay, if defective.
Step 6. If low oil pressure light is still on, notify Direct Support Maintenance that compressor crankcase has low
oil pressure.
12. HIGH DISCHARGE PRESSURE LIGHT (DS3) ON.
Step 1. Check that condenser fan motor (B3) runs.
Go to malfunction No. 7.
WARNING
Disconnect input power before performing internal electrical troubleshooting.
Voltages used can be deadly.
Step 2. Feel condenser coil.
If coil is exceptionally hot, contact Direct Support Maintenance for refrigeration system troubleshooting.
Step 3. Check condenser coil for cleanliness.
If dirty, clean coil (para 4-90).
Step 4. With unit operating in COOL mode, check condition of refrigerant in sight glass (Table 4-1, item 28).
Check sight glass (Table 4-1, item 28).
Step 5. Check operation of high discharge pressure relay (K1).
Test relay (para 4-49). Replace relay, if defective.
4-28
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