SiENBE07-618_C
Control Specification
Function and Control
35
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)
Return from stop
Reset zone
Up zone
Keep zone
Drooping zone
Stop zone
0°C
3°C
5°C
7°C
13°C
Indoor heat exchanger
thermistor temperature
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.
(°C)
65
(°C)
56
(°C)
55
(°C)
53
(°C)
51
°
C
°
C
°
C
°
C
°
C
Indoor heat exchanger
thermistor temperature
Stop zone
Keep zone
Up zone
Reset zone
Drooping zone
(R1380)
SIENBE07-618_C_FRONT.pdf 47
9/02/2011 9:25:05
