Control Specification
SiBE12-908
34
Function and Control
3.7
Freeze-up Protection Control
Outline
During cooling operation, the signals being sent from the indoor unit allow the operating
frequency limitation and then prevent freezing of the indoor heat exchanger. (The signal from
the indoor unit must be divided into the zones as the followings.
Detail
Conditions for Start Controlling
Judge the controlling start with the indoor heat exchanger temperature after 2 sec from
operation start and after 30 sec from changing number of operation room.
Control in Each Zone
3.8
Heating Peak-cut Control
Outline
During heating operation, the signals being sent from the indoor unit allow the operating
frequency limitation and prevent abnormal high pressure. (The signal from the indoor unit must
be divided as follows.)
Detail
Conditions for Start Controlling
Judge the controlling start with the indoor heat exchanger temperature after 2 min from
operation start and
sec from changing number of operation room.
Control in Each Zone
The maximum value of heat exchange intermediate temperature of each indoor unit controls the
following (excluding stopped rooms).
(R4561)
Return from stop
(Reference)
Reset zone
Heat exchanger
thermistor temperature
Up zone
Keep zone
Drooping zone
Stop zone
0˚C
3˚C
5˚C
7˚C
13˚C
When increase
30
When decrease
2
(Reference)
65˚C
55˚C
54˚C
52˚C
50˚C
Stop zone
Drooping zone
Keep zone
Up zone
Reset zone
Heat exchanger
thermistor
temperature
(R9851)
