Table 5-l. Direct support troubleshooting-Continued.

TM 5-4120-386-14

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

6. SUCTION PRESSURE TOO LOW OR TOO HIGH

Stop compressor and check expansion valve as follows:

Step 1.

a. Remove remote bulb from well in suction line.

b. Place bulb in ice water for 1-2 minutes.

c. Start compressor.

Do not let liquid flood back into compressor or compressor will be

seriously damaged.

d. Remove bulb from ice water and hold it in one hand

to warm it. At the same time, check the suction

line for rapid change of temperature, which

indicates flood-through of liquid refrigerant. If

liquid floods through valve, it is operating

satisfactorily. If not, valve or remote bulb is

faulty.

e. Replace faulty expansion valve. (Refer to

Feel dehydrator for temperature difference. Discharge end will feel

Step 2.

cooler than input end if clogged, or discharged end may be frosty or

sweaty.

Replace dehydrator. (Refer to paragraph 5-17.)

7. LOW HEAT OR NO HEAT

Step 1.

Check heater wiring and control circuit for loose connections or broken

wires.

a. Tighten loose connections.

b. Replace or repair broken wires (Refer to paragraphs

4-33, 4-24 and 4-26.)

Step 2. Check continuity of mode selector switch and temperature selector

switch. (Refer to paragraph 4-24.)

5-6