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Control Specification SiUS091628EA
37 Functions and Control
2.6 Freeze-up Protection Control
During cooling operation, the signal sent from the indoor unit determines the frequency upper limit
and prevents freezing of the indoor heat exchanger. (The signal from the indoor unit is divided into
zones.)
The operating frequency limitation is judged with the indoor heat exchanger temperature.
2.7 Heating Peak-cut Control
During heating operation, the indoor heat exchanger temperature determines the frequency upper
limit to prevent abnormal high pressure.
The operating frequency limitation is judged with the indoor heat exchanger temperature.
(R24371)
Reset zone
Indoor heat exchanger
temperature (R2T)
Up zone
Keep zone
Dropping zone
Stop zone
13˚C (55.4˚F)
7˚C (44.6˚F)
5˚C (41.0˚F)
3˚C (37.4˚F)
0˚C (32.0˚F)
09/12 class 15 class 18 class
(°C) (°F) (°C) (°F) (°C) (°F)
A 57.5 135.5 60 140.0 60 140.0
B 55 131.0 54 129.2 55 131.0
C 52 125.6 51 123.8 52 125.6
D 50 122.0 49 120.2 50 122.0
E 45 113.0 44 111.2 45 113.0
Zone Control
Stop zone When the temperature reaches the stop zone, the compressor stops.
Dropping zone The upper limit of frequency decreases.
Keep zone The upper limit of frequency is kept.
Up zone The upper limit of frequency increases.
Reset zone The upper limit of frequency is canceled.
Indoor heat exchanger
temperature
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
(R23928)
D
C
B
A
E