Table 3-3. Troubleshooting

TM 5-4110-217-14

Table 3-3. Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 7.

Check for obstruction to air flow through evaporator.

11.

ENGINE OIL CONSUMPTION EXCESSIVE.

Clean dirt from evaporator or move stored

material that restricts air circulation thru coil.

Step 1.

Check for leaky engine base drain plug

Step 8.

Check thermostat for too low setting.

Tighten or replace drain plug.

Reset thermostat

REFRIGERATION SYSTEM

Step 9.

Check for shorted thermostat.

12.

REFRIGERATION UNIT WILL NOT OPERATE.

Repair wiring or replace thermostat

15.

OPERATION OF UNIT NOISY.

Step 1.

Inspect thermostat for misadjustment

Adjust or replace

Step 1.

Check for loose compressor pulley.

Step 2.

Break or short circuit in wiring

Tighten pulley screws.

Trace wiring and repair.

Step 2

Check bearing lubrication.

13.

REFRIGERATION UNIT RUNS CONTINUOUSLY.

Lubricate bearings.

Step 3.

Inspect for unserviceable bearings.

Step 1

Check for low compressor speed.

Replace bearings

Adjust engine governer, inspect drive belts for

Step 4.

Check for loose drive pulley.

proper tension and adjust

Tighten pulley screws.

Step 2.

Check compressor discharge valve to see If closed

Step 5.

Inspect for worn belts.

too far.

Replace belts.

Turn valve stem out.

Step 6.

Check for loose evaporator fan or condenser fan.

Step 3.

Check for possible abnormally warm product load

Tighten fan screws or replace fans as necessary.

Remove part of load or allow absorption of heat

Step 7.

Check for fan blades striking housing.

Step 4.

Test for leaks through refrigerator walls or joints.

Align blades or orifices; or replace fan.

Seal all leaks.

ELECTRIC MOTOR (Model RMP-J/11-10E)

Step 5.

Check to see if thermostat is set too low.

16. ELECTRIC MOTOR DOES NOT START.

Reset thermostat to desired setting.

Step 1.

Check power supply

Step 6.

Inspect thermostat terminal leads for shorting.

Be sure that power supply is 208-volt, 3 phase,

Repair leads or wiring.

60 cycle.

Step 7.

Inspect thermostat for contacts fused in closed

Step 2.

Check thermostat setting.

position

Thermostat may be set higher than temperature in

Replace thermostat.

refrigerator. Adjust thermostat

Step 8.

Inspect for loose thermostat bulb.

Step 3.

Check fuse on control panel.

Tighten

Replace fuse, if blown.

14.

REFRIGERATION UNIT OPERATES TOO LONG.

17. ELECTRIC MOTOR DOES NOT RUN AT FULL SPEED.

Step 1.

Check power supply.

Step 1.

Check for loose compressor belts

Be sure that power supply is 208-volt, 3-phase

Adjust drive belt tension.

60 cycle.

Step 2.

Check for abnormal heat leakage from refrigerator.

Step 2.

Check for electrical system overload.

Seal cracks, replace gaskets.

Be sure electrical system is not overloaded.

Step 3.

Check for excessive product load.

Step 3.

Check for proper closing of magnetic motor starter

Remove part of load or allow more time for

contacts.

absorption of heat

Replace motor starter.

Step 4.

Check for partially closed receiver inlet valve

Step 4.

Check to see If motor has enough power to get up

Open valve as far as it will go.

speed.

Step 5.

Check for dirty condensor.

Suction pressure regulating valve may not be,

Clean condenser.

operating. Refer to direct support.

Step 6

Check evaporator coil for excessive frost.

Step 5.

Check for worn or dragging motor.

Defrost unit.

Repair or replace motor.

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