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MP-3000a Controller
97
•
Position 3: Not Used (Moduload Units Only)
•
Position 4: Not Used (Moduload Units Only)
•
Position 5: Defrost: Heaters are activated
(evaporator fans off).
•
Position 6: Heat: Evaporator fans operate at
high speed to introduce fan motor heat only
into the container (no electric heater
operation).
NOTE: The unit cooling capacity on Chill loads
can be reduced by almost closing the suction
service valve when Cool 1 is selected. If the
compressor overheats, select Cool 2.
To select Manual Control:
1. Turn the Unit On/Off switch to OFF.
2. Disconnect the unit power cord from the
power supply.
3. Disconnect cable no. 2 from the controller and
main relay board (see electrical schematic).
The main relay board will now control the unit
based on the manual control setting.
NOTE: MUST check 2-pin plug location on
J501 connections of main relay board to
ensure correct unit operation.
4. If necessary, remove 2-pin plug from J501
(see decal on main relay board) and re-locate
based on the unit operating mode required.
5. Connect the unit power cord to the proper
power supply.
6. Turn the Unit On/Off switch to ON. Unit will
start and operate.
7. Check for correct rotation of condenser fan
and evaporator fans. Condenser air should be
blowing out from the center of the grille.
Evaporator air should be blowing down
through the evaporator coil. If the fans are
running back-wards, the power supply phase
must be changed. To reverse power phase:
a. Turn On/Off switch OFF.
b. Disconnect unit power cord from power
supply.
c. Relocate the phase selector terminal plug
from J18 (see decal on main relay board).
Relocate from A to B (B to A) as required.
d. Connect unit power cord to the proper
power supply.
e. Turn the Unit On/Off switch to ON. Check
condenser and evaporator airflow again to
confirm correct fan rotation.
Replacing the Controller
1. Turn the unit On/Off switch OFF. Then
unplug the unit power cord from the power
supply.
2. Disconnect battery power connection from the
controller (top plug on the controller).
3. Disconnect the communication cables from
the controller and remote monitoring modem.
4. Remove the screws that secure the remote
monitoring modem to the controller.
5. Remove the screws that secure the controller
to the inside of the control box door.
6. Remove the controller from the door.
7. Install the replacement controller in the door
using the existing hardware. Connect the
keyboard cable to the controller.
8. Install the remote monitoring modem on the
back of the controller.
9. Connect the communication cables to the
remote monitoring modem and controller.
10. Set the software selection switch on the back
of the controller to position “2”.
CAUTION: The unit must be cycled
manually to maintain the desired
temperature. Monitor container
temperature with an external
thermometer.
WARNING: High voltage (460/380 volts)
is present on the contactors and relays in
the control box. To prevent dangerous
electrical shock, disconnect the supply
power to the unit whenever possible when
working in this area.
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...