Daikin FTXS09HVJU, Service Manual

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Control Specification (15/18/24 Class) SiUS04-904
54 Function and Control
model).
2. In case the operation mode is heating

The current drops when outdoor air temperature becomes higher than a certain level (model by
model).
4.6 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 figure:
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
4.7 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
shown in the following figure:
Detail
Conditions for Start Controlling
Judge the controlling start with the indoor heat exchanger temperature after 2 minutes from
operation start.
Control in Each Zone
The heat exchange intermediate temperature of indoor unit controls the following.
Dropping zone
Dropping zone