SiUS04-904 Control Specification (09/12 Class)
Function and Control 41
Detail The frequency control is 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 “
dropping current” continues for 1.0 second after rushing on the dropping zone, the frequency is
reduced by 2 Hz.
Repeating the above
dropping continues until the current remains in the dropping zone without
change.
In the keep zone, the frequency limit remains.
In the return / reset zone, the frequency limit is cancelled.
Limitation of current
dropping and stop value according to the outdoor air temperature
1. In case the operation mode is cooling
The current drops when outdoor air temperature becomes higher than a certain level (model by
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).
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
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