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TM 5-4120-386-14
Table 5-1. Direct support troubleshooting-Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. COMPRESSOR STARTS, BUT STOPS AT ONCE - "SHORT CYCLES" - Continued
Install pressure gages in system (paragraph 5-16) and check system
Step 6.
pressures to see whether an overcharge of refrigerant is indicated.
If overcharge is indicated, partially discharge the system and
retest.
3. INSUFFICIENT COOLING
Feel dehydrator to see whether it is cold to the touch, or is frosted or
Step 1.
sweating.
If so, replace dehydrator. (Refer to paragraph 5-17.)
Step 2. Check input and discharge sides of solenoid valves for temperature
difference, Abnormally cold discharge indicates leakage or obstruction.
Replace faulty solenoid valves. (Refer to paragraph 5-20.)
Step 3. Check evaporator coil for over-all temperature.
If part of coil is relatively warm, and evaporator inlet is sweaty
or frosty, expansion valve may be obstructed or damaged.
Step 4. Check liquid sight indicator for bubbles or cloudiness, which indicates
insufficient refrigerant.
Recharge system after checking for and repairing leaks. (Refer
to paragraphs 5-15 through 5-16.)
Step 5. Check for low discharge pressure to see whether compressor is
pumping. (Refer to table 5-2 for normal pressures.)
Replace faulty compressor. (Refer to paragraph 5-28.)
5-4

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