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MP-3000a Controller
63
Operating Mode Function Chart - Optional Feature Operation
5
Controller energizes electric heaters for frost protection, heat and defrost modes:
• Frost Protection (during compressor operation): If return air temperature decreases to within 0.3 C (0.5 F) of
setpoint, controller PULSES heaters ON and OFF on a 60 second duty cycle.
• Heat mode (compressor OFF): If supply air temperature is tool low, the controller PULSES heaters ON and
OFF on a 60 second duty cycle.
• Heat mode (compressor OFF): If supply air temperature is too low, the controller PULSES heaters ON and
OFF on a 60 second duty cycle.
• Defrost mode: Controller turn heaters ON until evaporator coil temperature increases to:
-Chill Loads: 30 C (86 F) or exceeds 18 C (65 F) for 15 minutes.
-Frozen Loads: 18 C (65 F) or exceeds 8 C (46 F) for 15 minutes.
Chill Loads Setpoints at
-9.9 C (14.4 F) and Above
Frozen Loads
Setpoints at -10.0 C
(14.0 F) and Below
Cool w/Mod Heat Defrost Cool Null Defrost Unit Function
Economy Mode ON: Evaporator Fans HIGH SPEED
1
•
•
•
Economy Mode ON: Evaporator Fans LOW SPEED
1
•
•
•
Economy Mode ON: Evaporator Fans OFF
1
•
Dehumidify ON: Dehumidify Valve CLOSED (energized)
2
•
Dehumidify ON: Electric Heaters ON (energized)
2
•
•
Humidify ON: Air Compressor ON (energized)
2
1
Economy Mode ON: •On Chill Loads, the evaporator fans operate on low speed when the supply air temperature
is In-range
•On Frozen Loads, the evaporator fans stop during the Null mode when the return air
temperature is In-range. A timer re-starts the evaporator fans on low speed for 5 minutes
every 45 minutes. If cooling is required, the evaporator fans operate until the unit returns to
null mode.
2
Dehumidification Option:
• When the humidity is more than 2% above humidity setpoint and the KVQ valve has reduced the unit cooling
capacity by about 25%, the controller CLOSES (energizes) the dehumidify valve.
• When the humidity is more than 5% above humidity setpoint and the KVQ valve has reduced the unit cooling
capacity by about 50% (40% at setpoint temperatures below 5 C [41 F], the controller also pulses the electric
heaters ON and OFF.
3
Humidification Option: When the container humidity is more than 2% below the humidity setpoint, the controller
operates (energizes) the air compressor to inject atomized water directly into the evaporator supply air stream.
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...