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Diagnosis
153
Condition
Possible Cause
Remedy
Evaporator fan motor(s)
does not operate
Unit on defrost
Check operating mode indicator LED’s
Unit in Economy Mode (Frozen Load;
Null mode ONLY)
Check setpoint, indicator lights and
Setpoint menu of the controller to verify
that Economy Mode is set to ON
Loose line connection
Tighten connections
Open motor internal thermal overload
protector
Check for seized bearings or defective
thermal overload protector. Repair or
replace as necessary.
Defective motor
Replace motor
Defective low or high speed
evaporator fan contactor
Replace defective contactor
No low or high speed evaporator fan
output signal from controller
Diagnose and replace evaporator fan
relay, main relay board or controller
Unit operating in a vacuum
(unit not cooling)
NOTE: When unit is in
Cool with Modulation or
the return air temperature
is below -18 C (0 F), the
suction pressure will be
less than 0 kPa, 0 bar, 0
psig during normal
operation
Shortage of refrigerant
Repair leak and recharge
Compressor motor contacts frozen
Clean points or replace contactor
Compressor inefficient
Check valves and pistons
Defective liquid line solenoid valve
Repair or replace liquid line solenoid
valve
Partial obstruction in low side or filter
drier
Locate obstruction and repair
Iced or plugged evaporator coil
Defrost or clean evaporator coil
Expansion valve partially closed by
ice, dirt or wax
Clean or replace expansion valve
Expansion valve power element lost
its charge
Replace expansion valve
Defective container insulation
Correct or replace container insulation
Poor fitting container doors
Repair or replace doors
Partial obstruction in high side
Locate obstruction and repair
Suction pressure gauge out of
calibration
Replace service gauge
Evaporator pressure regulator (KVQ)
valve stuck closed or defective
Repair or replace valve
Expansion valve feeler bulb
improperly mounted, poorly insulated
or making poor contact
Correct feeler bulb installation
Summary of Contents for CRR-40 119
Page 4: ......
Page 16: ...Safety Precautions 16...
Page 18: ...Service Guide 18...
Page 20: ...Model Features 20...
Page 32: ...Specifications 32...
Page 120: ...MP 3000a Controller 120...
Page 160: ...Wiring and Schematic Diagrams Index 160...
Page 161: ...161 MPC2000 Wiring Schematic...
Page 162: ...162 MPC2000 High Voltage Wiring Diagram...
Page 163: ...163 MPC2000 Low Voltage Wiring Diagram...
Page 164: ...164 MPC2000 WCC Wiring Schematic...