SiUS04-702 Control Specification (09/12 Class)
Function and Control 39
3.5 Input Current Control
Outline Detect an input current by the CT during the compressor is running, and set the frequency upper
limit from such input current.
In case of heat pump model, this control is the upper limit control function of the frequency which
takes priority of the lower limit of four way valve activating compensation.
Detail The frequency control will be made within the following zones.
When a “stop current” continues for 2.5 seconds after rushing on the stop zone, the compressor
operation stops.
If a “drooping current” is continues for 1.0 second after rushing on the drooping zone, the frequency
will be 2 Hz drooping.
Repeating the above drooping continues until the current rushes on the drooping zone without
change.
In the keep zone, the frequency limit will remain.
In the return / reset zone, the frequency limit will be cancelled.
Limitation of current drooping and stop value according to the outdoor air temperature
1. In case the operation mode is cooling
The current droops when outdoor air temperature becomes higher than a certain level (model
by model).
2. In case the operation mode is heating
The current droops when outdoor air temperature becomes higher than a certain level (model
by model).
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 the followings.)
Detail Conditions for Start Controlling
Judge the controlling start with the indoor heat exchanger temperature after 2 sec from operation
start.
Control in Each Zone
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