Table 4-6. Air Conditioner Abnormal Operating Pressures/Temperatures - Troubleshooting. - continued

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Table 4-6. Air Conditioner Abnormal Operating Pressures/Temperatures - Troubleshooting.

TM-55-1905-220-14-8 Landing Craft Utility LCU 1671-1679 NSN 1905-01-009-1056 Manual

Table 4-6. Air Conditioner Abnormal Operating Pressures/Temperatures - Troubleshooting. - continued

TM 55-1905-220-14-8

4-5. GENERAL (Continued).

Table 4-6. Air Conditioner Abnormal Operating Pressures/Temperatures - Troubleshooting (Continued).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 5. Refrigerant overcharge. Condenser tubes submerged in liquid refrigerant.

Remove excess refrigerant.

Step 6. Compressor discharge stop valve partially closed.

Open valve fully.

2. Low head pressure.

Step 1. Condenser water inlet temperature too low.

Reduce water flow by adjusting water regulating valve.

Step 2. Excessive water flow through condenser.

Adjust water regulating valve.

Step 3. Liquid refrigerant flooding back from evaporator. Defective or improperly set thermal

expansion valve.

Replace or adjust expansion valve to 8- 10 superheat. Examine fastening of thermal bulb.

Close hand expansion valves tightly.

Step 4. Compressor suction stop valve partially closed.

Open valve fully.

Step 5. Leaky compressor discharge valve.

Test for leaks. If leaking, pump down, remove cylinder head, examine valve and replace if

necessary.

Step 6. Leaky compressor suction valves.

Pump down, remove cylinder head, examine valve discs and valve seats.

Replace if

necessary.

Step 7. Worn piston rings.

Replace if worn.

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