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MP-3000a Controller
113
Code
Description
Corrective Action
23
Capacity Test 2 Error (Check Alarm)
• Occurs during Pretrip (PTI) test only.
• Difference between supply and return air
temperature is too small with high speed
evaporator fans (less than approximately 3.0 C
(5.4 F); or temperature difference is less than in
test P1.15.
• Return air temperature does not reach 0 C (32 F)
within preset time.
• Indicates:
• Incorrect location of supply or return air sensor
• Air leakage at supply, return or defrost
(evaporator coil) sensor cable
• Defective supply or return air sensor
• Interchanged sensor connections
• Incorrect evaporator fan rotation or low speed
operation
• Incorrect refrigeration system operation
• Container/side panels defective, damaged or
leaking
• Enter Manual Function Test and start evaporator
fans on HIGH speed. Then select Sensor
Checks test and operate fans 2 to 5 minutes.
Check supply, return and evaporator coil
(defrost) sensor temperatures. Sensor readings
should be the same (evaporator coil may be 0.5
C [1.0 F] lower due to fan motor heat).
NOTE: This sensor check does not detect air
leakage around the sensor cables.
• Open evaporator door and inspect evaporator
fan rotation. Make sure fans are rotating correctly
on high speed.
• Check the sensor connections.
• Enter Manual Function Test menu. Start and
check current draw of the following components
separately and together: compressor,
compressor 100%, condenser fan and
evaporator fans (high). Check discharge and
suction pressure readings. Also check the
refrigerant charge.
NOTE: Alarm can be activated in ambient
temperatures below -10 C (14 F), even under
normal conditions.
24
Capacity Test 3 Error (Check Alarm)
• Occurs during Pretrip (PTI) test only.
• Difference between supply and return air
temperature is too high with KVQ valve almost
closed and high speed evaporator fans (more
than 1.5 C [2.7 F]).
• Indicates:
• Defective KVQ valve
• Two gaskets (or thick gasket) in KVQ valve
actuator
• Incorrect location of supply or return air sensor
• Defective supply or return air sensor
• Expansion valve open too much
• Incorrect refrigeration system operation
• Container/side panels defective, damaged or
leaking.
• Enter Manual Function Test and start the
following components: Condenser fan,
evaporator fan (high), compressor and
compressor 25%. Check to be sure the KVQ
valve closes (suction pressure below 0 kPa, 0
bar, 0 psig).
• Check the supply and return air sensor
connections.
• Check the supply and return air sensor
calibration.
• Check expansion valve superheat setting.
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...