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 TM 55-1905-219-14-8
4-5. GENERAL (Continued).
Table 4-10. Air Conditioner Capacity Control
Troubles Troubleshooting (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 5.
Bellows of control valve leaking refrigerant into the atmosphere.
Leak test valve. Replace valve if bellows leak.
Step 6.
Foaming in crankcase due to oil dilution.
Examine thermal expansion valves and piping for cause of flooding.
3. Any one cylinder will not unload.
Step 1.
Unloader power element stuck.
Repair or replace.
Step 2.
Plugged oil pressure line to power element.
Clean out line.
Step 3.
Suction valve lifter mechanism defective. Insufficient valve lifter pin or spring lift.
Remove cylinder heads and valve plates. Valve lifter springs should project at least
.33 inch above valve seats for 5F compressors. Remove cylinder sleeve and replace
lifter parts, if defective.
4. Any one cylinder will not load.
Step 1.
Unloader power element stuck.
Repair or replace.
Step 2.
Broken oil pressure line to power element.
Low control oil pressure, with a drop in pressure at one step of unloading, indicates a
broken oil line to a power element. Repair line.
Step 3.
Plugged oil pressure line to power element.
Clean out line.
4-44
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