Freeze-Up Protection Control; Heating Peak-Cut Control - Daikin FTXM-K Series Service Manual

SiBE041434E
3.6

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.
35/42/50 class
3.7

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.
Function and Control
13˚C
Reset zone
A˚C
Up zone
B˚C
Keep zone
C˚C
Dropping zone
0˚C
Stop zone
A (°C)
20/25 class 11
9.5
B˚C
C˚C
D˚C
Indoor heat exchanger
thermistor temperature
20/25/35 class
A (°C) 58
B (°C) 52
C (°C) 49
D (°C) 47
E (°C) 44.5
Zone
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
Indoor heat exchanger
thermistor temperature
B (°C) C (°C)
9 7
7.5 5.5
42/50 class
53
50
47
45
42.5
When the temperature reaches the stop zone, the compressor stops.
The upper limit of frequency decreases.
The upper limit of frequency is kept.
The upper limit of frequency increases.
The upper limit of frequency is canceled.
Control Specification
(R14718)
Stop zone
A˚C
Dropping zone
Keep zone
Up zone
E˚C
Reset zone
(R14645)
Control
44