COMPRESSOR FAILS TO OPERATE

TM 5-4110-234-14

TO 40R7-5-7-1

Table 4-2. MODEL F10000R-6 TROUBLESHOOTING (cont.)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

WARNING

Disconnect power from the refrigeration unit before doing maintenance work on the internal parts. The

voltage used can be dangerous to life.

Step 2.

Evaporator fan loose, binding or damaged.

Tighten setscrews or relieve binding as necessary. Replace damaged fan.

Step 3.

Drive belt is loose or broken.

Adjust or replace (para 4-43).

Step 4.

Check evaporator coil for dirt.

Clean the coil.

Step 5.

Check evaporator coil for iced-up condition. If icing is found, it will usually indicate a low cooling

load or that the thermostat is set too low or that the air flow is blocked.

Do not use steam, open flame, heat gun or any other high-temperature heat source to thaw an iced coil.

Thaw an iced coil with a lamp bulb (75-watt maximum), hair drier, electric fan or by leaving the unit shut

down until ice melts.

5. COMPRESSOR FAILS TO OPERATE

Step 1.

Make sure refrigerator switch is set to ON.

Place switch in ON position.

Step 2.

Check if thermostat is not set at low enough temperature.

Adjust thermostat (fig. 4-2).

Step 3.

Check for loose connections in wiring.

Tighten loose connections.

Step 4.

Inspect compressor motor controller for breaks, cracks, corrosion, rust and loose electrical

connections. Also check continuity after removing controller.

Replace defective controller (para 4-39).

Step 5.

Check for defective compressor.

Report to direct support maintenance.

6. UNIT RUNS CONTINUOUSLY

Step 1.

Check for defective electric motor.

Adjust or replace (para 4-76).

Step 2.

Check whether fans are operating.

Adjust drive belt or replace (4-43).

Step 3.

Check for defective relay.

Replace relay (para 4-33).

Step 4.

Check whether compressor service valves are stuck open or leaking.

Report to direct support maintenance.

Step 5.

With unit operating in cooling cycle check the refrigerant sight glass.

If center indicator is pink or if numerous bubbles appear contact direct support

maintenance.

4-23