Freeze-Up Protection Control; Heating Peak-Cut Control - Daikin FTXG20LV1BW Service Manual

SiBE041401E
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.
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) B (°C)
9.5 7.5
B˚C
C˚C
D˚C
Indoor heat exchanger
thermistor temperature
Zone
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
20/25/35 class
A (°C) 65
B (°C) 56
C (°C) 53
D (°C) 51
E (°C) 46
Indoor heat exchanger
thermistor temperature
C (°C)
5.5
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.
50 class
65
56
55
53
51
Control Specification
(R14718)
Stop zone
A˚C
Dropping zone
Keep zone
Up zone
E˚C
Reset zone
(R14645)
Control
42