Table 4-10. Air Conditioner Capacity Control Troubles Troubleshooting.

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Table 4-9. Air Conditioner System Noises - Troubleshooting. - continued

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

Table 4-10. Air Conditioner Capacity Control Troubles Troubleshooting. - continued

TM 55-1905-220-14-8

4-5. GENERAL (Continued).

Table 4-10. Air Conditioner Capacity Control Troubles Troubleshooting.

NOTE

Refer to paragraphs 4-29 and 4-30 for air conditioning and compressor

maintenance instructions.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. Compressor will not unload.

Step 1. Capacity control valve inoperative.

Repair or replace.

Step 2. External adjusting stem damage.

Remove stem housing and inspect. Replace if necessary.

2. Compressor will not load.

Step 1. Low oil pressure.

Check oil pressure with capacity control valve adjusting stem turned all the way out. Oil

pressure should be 45 - 55 psi above crankcase pressure.

Step 2. Capacity control valve stuck open.

If control oil pressure is low for all adjustment stem positions, repair or replace control valve.

Step 3. Control valve adjusting stem traveling nut out of guide or stem broken.

Remove stem housing and inspect. Engage nut or replace stem.

Step 4. Control oil strainer blocked.

If control oil pressure cannot be raised by adjusting control valve, clean or replace strainer.

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