Freeze-Up Protection Control; Heating Peak-Cut Control - Daikin FTXR-T Series Service Manual

Control Specification
3.6

Freeze-up Protection Control

Outline During cooling operation, the signal sent from the indoor unit determines the frequency upper limit
and prevents freezing of the indoor heat exchanger. The signals from the indoor unit are divided
into zones.
Details
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.
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
A
B
C
D
E
52
(Reference)
13°C (55.4°F)
Reset zone
6.5°C (44°F)
Up zone
6°C (43°F)
Keep zone
5.5°C (41.9°F)
Dropping zone
0°C (32°F)
Stop zone
B
C
D
Indoor heat exchanger
temperature
Zone
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.
09/12 class
(°C) (°F) (°C)
57.5 135.5 60
55 131.0 55
52 125.6 52
50 122.0 50
45 113.0 45
Indoor heat exchanger
temperature (R2T)
Control
18 class
(°F)
140.0
131.0
125.6
122.0
113.0
SiUS041829E
Stop zone
A
Dropping zone
Keep zone
Up zone
E
Reset zone
(R23928)
Part 4 Functions and Control
R4003563