Function and Control
6.7 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
| Stop zone | |
| Drooping zone | |
| Keep zone | |
| Up zone | |
Heat exchanger | Reset zone | |
thermistor | ||
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temperature |
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Management within the Zones | ||
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Zone | Control contents | |
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Stop zone | When the temperature reaches the stop zone, stop the compressor and | |
| correct abnormality. | |
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Drooping zone | Start the timer, and the frequency will be drooping. | |
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Keep zone | Keep the upper limit of frequency. | |
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Return / Reset zone | Cancel the upper limit of frequency. | |
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6.8 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.
2 Hz drooping |
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1.0second after |
| After 2.5 seconds | ||
rushing in the |
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| Compressor stops |
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drooping zone |
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1 |
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| Stop zone |
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2 |
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| Drooping zone |
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3 |
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| Keep zone |
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| Reset zone | ||
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).
6.9 Freeze-up Protection Control
Outline
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