Control Specification
SiUS042113E
68
Part 4 Functions and Control
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.
R4003644
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.
Reset zone
Up zone
Keep zone
Dropping zone
Stop zone
13°C (55.4°F)
7°C (44.6°F)
3°C (37.4°F)
0°C (32.0°F)
5°C (41.0°F)
(Reference)
Indoor heat exchanger
temperature (R2T)
Zone
Control
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.
09/12 class
18/24 class
(°C)
(°F)
(°C)
(°F)
A
62
144
60
140
B
54
129
54
129
C
50
122
51
124
D
48
118
49
120
E
44
111
44
111
Indoor heat exchanger
temperat
u
re
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
(R23928)
D
C
B
A
E
Summary of Contents for FTXM-V Series
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