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

Control Specification
3.7

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.
3.8

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
68
(Reference)
13°C (55.4°F)
Reset zone
7°C (44.6°F)
Up zone
5°C (41.0°F)
Keep zone
3°C (37.4°F)
Dropping zone
0°C (32.0°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 18/24 class
(°C) (°F) (°C)
62 144 60
54 129 54
50 122 51
48 118 49
44 111 44
Indoor heat exchanger
temperature (R2T)
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
Control
(°F)
140
129
124
120
111
SiUS042113E
R4003644
A
E
(R23928)
Part 4 Functions and Control