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

SiUS04-924_A
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
34
13˚C (55.4˚F)
Reset zone
7˚C (44.6˚F)
Up zone
5˚C (41˚F)
Keep zone
3˚C (37.4˚F)
Dropping zone
0˚C (32˚F)
Stop zone
B
C
D
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.
A 65°C (149°F)
B 56°C (132.8°F)
C 55°C (131°F)
D 53°C (127.4°F)
E 51°C (123.8°F)
Indoor heat exchanger
thermistor temperature
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
Control
Control Specification
(R14456)
A
E
(R14713)
Function and Control