Unit Description, Features & Options
27
The evaporator fan low speed RPM is one-half the high speed RPM.
The controller determines evaporator fan motor speed based on the setpoint temperature and the
Economy mode setting.
NOTE: If Non-Optimized mode is on:
• Chill Loads: Evaporator fans operate on high speed
• Frozen Loads: Evaporator fans operate on low speed
NOTE: If optimized mode is on:
• Chill Loads: Evaporator fans operate on high and low speed - depending on the need for cooling.
• Frozen Loads: Evaporator fans operate on low speed and stops when there is no need for cooling.
Condenser Fan Control
The controller also uses a proportional-integral derivative algorithm to control the condenser temperature
and ensure a constant liquid pressure at the expansion valve. The condenser fan operates continuously in
high ambients. In low ambient conditions, the controller cycles the condenser fan on and off to maintain a
minimum condenser temperature. The controller maintains a minimum 30 C (86 F) condenser
temperature on Chill loads and a minimum 20 C (68 F) condenser temperature on Frozen loads.
USDA Cold Treatment Temperature Recording (standard)
The MP-4000 controller includes provisions for the use of three or four USDA sensors. These sensors
allow temperatures in various areas of the load to be monitored and recorded for United States
Department of Agriculture use in monitoring Cold Treatment shipments.
When USDA sensors are installed, the controller will automatically detect each sensor and activate data
logging. However, the USDA Type screen in the Configuration menu
must
be set to the correct sensor
setting and each USDA sensor
must
be calibrated to comply with USDA temperature recording
requirements.
Figure 10: Water-Cooled Condenser/Receiver Tank
Summary of Contents for 098203
Page 2: ......
Page 3: ...MAGNUM TK 60275 4 MM Rev 3 08 15 Copyright 2012 Ingersoll Rand EMEIA Printed in Ireland...
Page 193: ...Refrigeration Maintenance 191 Figure 163 Filter Drier...
Page 200: ...Refrigeration Maintenance 198 Figure 169 Receiver Tank Figure 170 Water Cooled Condenser Tank...
Page 257: ...255 Schematic Diagram RELEASED 19 Sep 2013...
Page 258: ...256 Wiring Diagram Page 1 of 2 RELEASED 19 Sep 2013...
Page 259: ...257 Wiring Diagram Page 2 of 2 RELEASED 19 Sep 2013...
Page 263: ......