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TM 5-4110-217-14
Table 3-3. Troubleshooting - Continued
MALFUNCTION
MALFUNCTION
TEST OR INSPECTION
TEST OR INSPECTION
CORRECTIVE ACTION
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.
3-10

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