Freeze-Up Protection Control; Heating Peak-Cut Control - Daikin FTKN09NMVJU Service Manual

Control Specification
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.
A
B
C
D
E
41
(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
thermistor temperature
09/12 class
(°C) (°F)
59 138.2
55 131.0
52 125.6
50 122.0
45 113.0
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.
Indoor heat exchanger
thermistor temperature
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
RXN18NMVJU
RX18NMVJU
24 class
(°C) (°F)
60 140.0
54 129.2
51 123.8
49 120.2
44 111.2
Control
SiUS041501E
(R21660)
A
E
(R14665)
Function and Control