Emergency Run Mode

Use this procedure to run the unit in emergency mode if the Control Module (CM) or Power Module (PM) are found to be defective while under load and no replacement parts are available.

Parent topic: Operating Instructions MP4000

Rotation Check

  1. Unplug unit and turn OFF the main circuit breaker (CB) located in the controller box.

  2. Remove compressor wires CP1, CP2, and CP3 from J5 on the PM and connect them to the output side (left side) of the main CB. Refer to Rotation Check as shown below.

  3. Make up 3 16 GA (2 mm) jumper wires 16” long (400 mm), mark them CF1, CF2, CF3. Connect the wires from J11 terminal on the PM and connect the other end to the input (left side) of the compressor contactor. Verify to maintain the wiring 1-1, 2-2, 3-3. Refer to Rotation Check as shown below.

    		      
      1 3 CF Wires 16 GA 16 in. long (400 mm)
      2 3 Wires 18 GA 3 in. long (75 mm)
         
         
         
         

  4. Locate J1 connector at top left side of PM and disconnect.

    Rotation Check
    		      
      1 J1 Connector Disconnect from PM
      2 CP Wires Connected to Output Side of Main CB
      3 CF Wires Connected at J11 and Input Side of Compressor Contactor
         
         
         

  5. Plug unit in and turn CB ON. Observe the condenser fan rotation to be correct, air out of condenser grille, CCW. If wrong, turn CB OFF and unplug unit. Swap 2 of the CP wires and recheck for correct fan rotation.

FULL COOL Mode

  1. Unplug unit and turn off the CB located in the controller box.

  2. Remove the Condenser Motor wires CF1, CF2, and CF3 from the input side of the compressor contactor, installed during the Rotation Check. Re-tighten input wires.

  3. Remove the Low Speed Evaporator wires EF1, EF2, and EF3 from J10 on the PM.

  4. Connect the CF and EF wires to the output side (right side) of the compressor contactor. Verify to maintain wiring 1-1 2-2 3-3. Refer to Rotation Check as shown above.

  5. Locate J1 connector top left side of PM. Disconnect J1 connector from the PM. Install 3 18 GA 3” long jumper wires on the J1 connector. Leave J1 disconnected during cool mode. Refer to Rotation Check as shown above.

    1. Pin 1 (wire 29VAC 0) to pin 6 (wire CC1).

    2. Pin 2 (wire 29VAC 1) to pin 3 (wire HPCO-0).

    3. Pin 4 (wire HPCO-1) to pin 5 (wire CC0).

  6. Emergency Run Mode for R134a Compressor:

    1. Remove CC3 wire from Pin 3 J9 (Controller Board) and connect to PIN 1 J1 (Power Module).

    2. Remove CC2 wire from PIN 4 J9 (Controller Board) and connect to PIN 2 J1 (Power Module).

  7. Plug unit into, turn main CB ON and OFF to maintain box temperature. If compressor runs backward but the fans run correct, swap the Red and White wires on the output side of the compressor contactor.

If unit is running in high ambient with high box temperature, monitor compressor amperage using a amp probe. Maintain <12 amp by closing suction service to limit capacity.

 
 
1 CP Wires Connected to Output Side of Main CB 3 J1 Connector Disconnect from PM
2 CF and EF Wires Connected to Output of Compressor Contactor    

DEFROST Mode

  1. Unplug unit and turn main CB OFF located in the control box.

  2. Locate J1 connector disconnected in the FULL Cool mode. Disconnect the jumper wire from pin 1 to pin 6.

    		      
      1 Black Heater Wire Connected to Compressor Contactor Input Side
      2 J1 Connector with Pin 1 Wire Disconnected
         
         
         
         

  3. Disconnect CC3 wire from PIN 1 J1 (Power Module).

  4. Disconnect wires from J7 on the PM and connect them to the input side (left side) of the compressor contactor.

  5. Plug unit in and turn main CB ON to defrost coil and OFF once no water is flowing from drains.

    Important DO NOT LEAVE THE HEATERS ON FOR MORE THAN ONE HOUR. When running a unit in Defrost mode, DO NOT leave unit unattended.

  6. To return to the FULL COOL mode, turn main CB OFF and unplug the unit. Remove the heater wires from the compressor contactor and re-tighten the input wires. Reinstall the jumper wire on J1 connector pin 1 to pin 6.

Low Speed Fans Only

    Notice
  • Cargo Loss
  • Running the unit with evaporator fans only will add heat to the box, do not leave unit unattended.

  1. Unplug unit and turn main CB OFF located in the control box. 2. 3. 4. 5.

  2. Locate J1 connector disconnected in the FULL Cool mode. Disconnect the jumper wire from pin 1 to pin 6.

  3. Disconnect EF1, EF2, EF3 for low speed from J10.

  4. Connect the EF to the output side of the compressor contactor (left side).

  5. Plug unit in and turn main CB ON and OFF to maintain box temperature.

      
  1 EF Wire Connected to Input Side of Compressor Contactor
  2 J1 Connector Disconnected from PM