DAMA-SM-21-001 Control Specification
Functions and Control 41
3.7 Freeze-up Protection Control
Outline During cooling operation, the signals sent from the indoor unit control the operating frequency
limitation and prevent freezing of the indoor heat exchanger. The signal from the indoor unit is
divided into zones.
Details The operating frequency limitation is judged with the indoor heat exchanger temperature.
Frequency control in each zone
Zone Control
Reset zone The upper limit of frequency is cancelled
Up zone The upper limit of frequency increases
Keep zone The upper limit of frequency is kept
Dropping zone The upper limit of frequency decreases
Stop zone When indoor coil temperature <0°C for >80s, compressor is stopped
A (°C) B (°C) C (°C)
All outdoor units 7.0 5.0 3.0
A (°F) B (°F) C (°F)
All outdoor units 44.6 41.0 37.4
Indoor heat exchanger
thermistor temperature
0°C (°F)
C°C (°F)
B°C (°F)
A°C (°F)
13°C (55.4°F)
Reset zone
Up zone
Keep zone
Dropping zone
Stop zone
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