TM 9-4120-404-14
Table 4-1. Direct Support Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. DISCHARGE PRESSURE TOO HIGH.
Step 1.
Clean condenser coil.
Step 2.
Check for refrigerant overcharge.
Step 3.
Check to see if condenser fan is loose on shaft.
2. DISCHARGE PRESSURE TOO LOW.
Step 1.
Check refrigerant pressure for low refrigerant charge.
Step 2.
Step 3.
3. SUCTION PRESSURE TOO HIGH.
Step 1.
Check to see if solenoid valve is stuck open.
Step 2.
Check for defective actuator and actuator cables.
Check for defective actuator cylinder (see para. 4-20) and broken or loose
louver actuator cables (see para. 3-35). Repair or replace actuator cylinder
and/or louver actuator cables.
4-2