Freeze-Up Protection Control; Heating Peak-Cut Control - Daikin SUPER MULTI NX G Series Service Manual

SiUS12-928_A
3.6

Freeze-up Protection Control

Outline
During cooling operation, the signals sent from the indoor unit allow the operating frequency
limitation and prevent freezing of the indoor heat exchanger. (The signal from the indoor unit is
divided into zones.)
Details
The operating frequency limitation is judged with the indoor heat exchanger temperature 2 seconds
after operation starts and 30 seconds after the number of operation room is changed.
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.
 The operating frequency is judged with the indoor heat exchanger temperature 2 minutes after
Detail
 The maximum value of the indoor heat exchanger temperature controls the following (excluding
Function and Control
(Reference)
13°C (55°F)
Reset zone
7°C (45°F)
Up zone
5°C (41°F)
Keep zone
3°C (37°F)
Dropping zone
0°C (32°F)
Stop zone
the operation starts and (
stopped rooms).
Indoor heat exchanger
thermistor temperature
Zone
Stop zone When the temperature reaches the stop zone, the compressor stops.
Dropping zone The timer starts, and the frequency is
Keep zone The upper limit of frequency is kept.
Up zone The upper limit of frequency is increased.
Reset zone The upper limit of frequency is canceled.
18 class
65ºC (149ºF)
50ºC (122ºF)
48ºC (118ºF)
47.5ºC (117.5ºF)
46.5ºC (116ºF)
Indoor heat exchanger
thermistor temperature
) seconds after the number of operation room is changed.
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
(R11595)
Control
24/32 class
65ºC (149ºF)
54ºC (129ºF)
53ºC (127ºF)
51ºC (124ºF)
49ºC (120ºF)
Control Specification
Return from stop
(R12295)
When increase 30
When decrease 2
dropping .
50