Evaporator Fans

MAGNUM PLUS models are equipped with either 2 or 3 evaporator fans. All models feature 2-speed motors. The evaporator fans operate continuously to circulate air inside the container. The evaporator fans operate on the following:

  • High and low speed for chilled cargo at setpoints of -9.9 C (14.1 F) and above.

  • Low speed for frozen cargo at setpoints of -10 C (14 F) and below.

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.

If Non-Optimized mode is on:

  • Chill Loads: Evaporator fans operate on high speed.

  • Frozen Loads: Evaporator fans operate on low speed.

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.

Parent topic: Unit Description