Operation Section
37
5.13 Internal Drain Pump Operation
• The internal drain pump evacuates evaporator
condensation accumulated in the drain pan.
This pump turns on only when the compressor
is turned on.
• After the compressor turns OFF, the internal
drain pump continues to operate for 2.5
minutes before it turns OFF.
5.14 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)
5.15 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 electricity is being generated, the relay board built into
the fan motor will be damaged.
To prevent damage to the relay board, the unit turns OFF when either the evaporator fan motor,
or condenser fan motor rotates in reverse.
- Unit OFF conditions: Reverse rotation speed is at or above 760 rpm
- Unit ON conditions: Automatic recovery when reverse rotation speed is below 760 rpm
5.16 Automatic Restart After Power Interruption
(Automatic Recovery Function)
• The program within the CM 25 microprocessor 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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