![background image](http://html.mh-extra.com/html/thermo-king/crr-40-119/crr-40-119_manual_1104388105.webp)
MP-3000a Controller
105
Code
Description
Corrective Action
24
Evaporator Coil Temperature Too High
(Check Alarm)
• During Chill or Frozen Mode: Evaporator coil
temperature is too high compared to return
air temperature under operating conditions.
• Indicates:
• Low refrigerant charge.
• Defective evaporator coil or return air
sensor
• incorrect connection or location of
evaporator coil or return air sensor
• Check for sensor alarm codes.
• Check discharge and suction pressure gauge
readings and check refrigerant charge.
• Check evaporator coil and return air sensor
connections and locations.
25
Return Air Temperature Too High (Check
Alarm)
• During Defrost: Return air temperature
increases above 40 C (104 F).
• Indicates:
-Defective return or evaporator coil sensor
-Return and evaporator coil sensor connections
are reversed
• Check for sensor alarm codes.
• Check supply and return sensor connections
and locations.
26
Evaporator Coil Temperature Too Low
(Check Alarm)
• During Chill or Frozen Mode: Evaporator coil
temperature is tool low compared to return air
temperature under actual operating
conditions.
• Controller initiates defrost if not recent
defrost.
• Indicates:
• Air flow is blocked in the container
• Evaporator fans do not operate
• Fresh air exchange vent open too much on
frozen load
• Defective evaporator coil or return air
sensor
• Check for sensor or evaporator fan alarm codes.
• Open evaporator door. Inspect coil for ice or
frost and initiate manual defrost if necessary.
Check for correct evaporator fan rotation and
operation.
• Inspect return air flow and cargo load. Remove
any debris or cargo from blocking return air
grille.
• At setpoints below 5 C (41 F0, maximum air vent
setting is not allowed.
• Check evaporator coil and return air sensor
connections and locations.
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...