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13. Protection
Control
13.1 Freeze Prevention control (Cool)
When received freeze prevention signal from indoor unit, the compressor frequency changes according to indoor
heat exchanger temperature.
When indoor unit request capability OFF due to freeze condition, immediately the capability supply to targeted
indoor unit stops.
13.2 Dew Prevention control (Cool)
When received dew prevention signal from indoor unit, which according to indoor intake temperature and indoor
heat exchanger temperature the compressor frequency changes.
13.3 Electronic Parts Temperature Rise Protection 1 (Cool)
This control prevents electronic parts temperature rise during cooling overload condition.
Start
conditions:
o
Outdoor ambient temperature is at protection region as shown in figure below:
o
Outdoor unit total current is above 5.5A (3E), 5.0A (2E18/2E15/2E12)
Control
content
o
Outdoor fan speed is adjusted accordingly.
Control
stop
condition
o
When outdoor ambient temperature is back to normal region.
During this control, outdoor fan speed does not reduce for Quiet operation.
13.4 Electronic Parts Temperature Rise Protection 2 (Cool)
This control prevents electronic parts temperature rise during cooling/dry operation.
Start
conditions:
o
Total current is at protection region as shown in figure below:
Control
content
o
Outdoor fan speed is adjusted accordingly.
Control
stop
conditions
o
When total current is back to normal region.
During this control, outdoor fan speed does not reduce for Quiet operation.
Protection
Region
Normal
Region
32°C
30°C
OD temp
Protection
Region
Normal
Region
4.7A
3.3A
Total current
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