SiUS04-924 Control Specification
34 Function and Control
3.6 Freeze-up Protection Control
Outline During cooling operation, the signals being sent from the indoor unit allow the operating frequency
limitation and then prevent freezing of the indoor heat exchanger. The signal from the indoor unit
must be divided into the zones as shown in the following diagram:
Detail Conditions for Start Controlling
Judge the controlling start with the indoor heat exchanger temperature after 2 seconds from
operation start.
Control in Each Zone Heating Peak-cut Control
3.7 Heating Peak-Cut Control
Outline During heating operation, the signals being sent from the indoor unit allow the operating frequency
limitation and prevent abnormal high pressure. The signal from the indoor unit must be divided as
follows:
Detail Conditions for Start Controlling
Judge the controlling start with the indoor heat exchanger temperature.
Control in Each Zone
The heat exchanger’s intermediate indoor unit temperature controls the following:
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