Freeze-Up Protection Control; Heating Peak-Cut Control - Daikin FTXN25KEV1B Service Manual

Control Specification
3.6

Freeze-up Protection Control

Outline During cooling operation, the signal sent from the indoor unit controls the operating frequency
limitation and prevents freezing of the indoor heat exchanger. (The signal from the indoor unit is
divided into zones.)
Detail The operating frequency limitation is judged with the indoor heat exchanger temperature.
3.7

Heating Peak-cut Control

Outline During heating operation, the indoor heat exchanger temperature determines the frequency
upper limit to prevent abnormal high pressure.
Detail
A (°C)
B (°C)
C (°C)
D (°C)
E (°C)
28
13˚C
Reset zone
11˚C
Up zone
9˚C
Keep zone
7˚C
Dropping zone
0˚C
Stop zone
B˚C
C˚C
D˚C
Indoor heat exchanger
thermistor temperature
Zone
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.
61
55
52
50
45
Indoor heat exchanger
thermistor temperature
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
Control
SiBE041102_A
(R14841)
A˚C
E˚C
(R14842)
Function and Control