Control Specification Si12-411A
94 Function and Control
3.4 Discharge Pipe Control
Outline The discharge pipe temperature is used as the compressor's internal temperature. If the
discharge pipe temperature rises above a certain level, the operating frequency upper limit is
set to keep this temperature from going up further.
Detail Divide the Zone
Management within the Zone
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 unchanged 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 (only for heat pump model)
The current droops when outdoor air temperature becomes higher than a certain level
(model by model).
Zone Control contents
Stop zone When the temperature reaches the stop zone, stop the compressor and
correct abnormality.
Drooping zone Start the timer, and the frequency will be drooping.
Keep zone Keep the frequency upper limit.
Return / Reset zone Cancel the frequency upper limit.
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