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Control Specification
DAMA-SM-21-003
38
Functions and Control
3.6 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
DAMA-SM-21-003 -Inverter Multi Split-CTX Series.book Page 38 Wednesday, September 1, 2021 5:44 PM
Summary of Contents for 2MX18AXVJU
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