Control Specification SiENBE04-808_A
53 Function and Control
3.6 Freeze-up Protection Control
Outline During cooling operation, the signal sent from the indoor unit controls the operating frequency
limitation and prevents freezing of the indoor heat exchanger. (The signal from the indoor unit is
divided into zones.)
Detail The operating frequency limitation is judged with the indoor heat exchanger temperature.
3.7 Heating Peak-cut Control
Outline During heating operation, the indoor heat exchanger temperature determines the frequency
upper limit to prevent abnormal high pressure.
Detail
(R4561)
Reset zone
Indoor heat exchanger
thermistor temperature
Up zone
Keep zone
Drooping zone
Stop zone
0°C
5.5°C
7.5°C
9.5°C
13°C
(Reference)
Zone Control
Stop zone When the temperature reaches the stop zone, the compressor stops.
Drooping zone The timer starts, and the frequency is drooping.
Keep zone The upper limit of frequency is kept.
Up zone The upper limit of frequency is increased.
Reset zone The upper limit of frequency is canceled.
20/25/35 class 42 class 50 class
(°C) 65 65 65
(°C) 56 55 56
(°C) 53 54 55
(°C) 51 52 53
(°C) 46 50 51
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