Operation Section
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7.10 Anti-Frost Control
• Anti-frost controls activate in accordance with the evaporator pipe inlet thermistor (CTS2)
temperature in order to turn the compressor on and off, and prevent a decrease in cooling
performance resulting from a buildup of frost on the evaporator.
• Compressor off conditions: Evaporator pipe inlet thermistor (CTS2) temperature 27 °F (-3 °C)
• Compressor on (recovery) conditions: CTS2 temperature 43 °F (6 °C)
7.11 Fan Motor Reverse Rotation Protection
• When the motor rotates in reverse due to an external force, electricity is generated inside the
motor. If the fan motor is operated while the electricity is being generated, the relay board built
into the fan motor will be damaged.
To prevent damage to the relay board, the unit automatically turns OFF when the evaporator fan
motor rotates in reverse at speed 760 rpm or above. The unit automatically turns back on when
the evaporator fan motor rotates in reverse at speed less than 760 rpm.
7.12 Automatic Restart After Power Interruption
(Automatic Recovery Function)
• The program within the microprocessor of the unit contains a feature that will automatically
restart the unit after power is lost and then regained. The unit also has memory in order to return
itself back to the operating mode (either manual or preset program) it was in prior to the loss of
power. Any “preset” program will also be retained in the memory in the event power loss occurs.
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