Panasonic CU-3Z52TBE - Protection Control; Cooling Protection Functions

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14. Protection Control
14.1 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.
14.2 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.
14.3 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:
Protection
Region
Normal
Region
32°C
30°C
OD temp
o Outdoor unit total curre
nt is above 5.5A
 Control
conten
t
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.
14.4 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:
Protection
Region
Normal
Region
4
.7A
3.3A
Total current
 Control conte
nt
o
Outdoor fan speed is adjusted accordingl
y.
 Control stop conditions
o When total current is back to normal region.
 During this control, outdoor fan speed does not reduce for Quiet operation.
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