Unit Control
1.2 Control Flowchart
2 Main Control Logics
2.1 Cooling
2.1.1 Control to the Compressor
When the unit is controlled by the leaving water temperature, the operating frequency of the
compressor will be adjusted by the temperature difference in the way that it increases as the
temperature difference goes up and it decreases as the temperature difference goes down.
(Temperature difference= actual leaving water temperature-leaving water temperature set point).
2.1.2 Freeze Protection
When it is detected that the leaving water temperature of the plate heat exchanger is lower than the
freeze protection temperature, the compressor will drop its operating frequency until it reaches the
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