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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
12. HIGH DISCHARGE PRESSURE LIGHT (DS3) ON - Continued
Step 6. Check operation of relay (K1) 11-pin socket.
Test socket (para 4-50). Replace socket, if defective.
Step 7. Check operation of suppression diode (CR6).
Test diode (para 4-47). Replace diode, if defective.
Step 8. If high discharge pressure light (DS3) is still on, contact Direct Support Maintenance for refrigeration
system troubleshooting.
13. LOW SUCTION PRESSURE LIGHT (DS4) ON.
Step 1. With unit operating in COOL mode, check condition of refrigerant in sight glass (Table 4-1, item 28).
a. Check sight glass (Table 4-1, item 28).
b. Clean evaporator coil (para 4-91).
Step 2. Feel outlet line of drier filter (1-9).
If outlet line is much cooler than inlet line, contact Direct Support Maintenance.
Step 3. Check all piping and connections for leaks.
If leaks are suspected, contact Direct Support Maintenance for refrigeration system troubleshooting.
Step 4. Check operation of low pressure relay (K2).
Test relay (para 4-49). Replace relay, if defective.
Step 5. Check operation of relay socket (K2).
Test socket (para 4-50). Replace socket, if defective.
Step 6. Check operation of suppression diode (CR7).
Test diode (para 4-47). Replace diode, if defective.
Step 7. If low suction pressure light (DS4) is still on, contact Direct Support Maintenance.
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