SiUS12-814 Control Specification
Function and Control 45
3.6 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 shown in the following diagram:
Detail Conditions for Start Controlling
Judge the controlling start with the indoor heat exchanger temperature after 2 seconds from
operation start and after 30 seconds from changing the number of the operation room.
Control in Each Zone
3.7 Heating Peak-cut Control
Outline Heat Pump Only
During heating operation, the signals being sent from the indoor unit allow the operating frequency
limitation and prevent abnormally high pressure. The signal from the indoor unit must be divided as
shown in the following diagram:
Detail Conditions for Start Controlling
Judge the controlling start with the indoor heat exchanger temperature after 2 minutes from
operation start and after (A) seconds from changing number of operation room.
Control in Each Zone
The maximum value of heat exchange intermediate temperatures of each indoor unit controls the
following (excluding stopped rooms):
Keep zone
Dropping zone
A
30
2
When increase
When decrease
(R4579)
Keep zone
Dropping zone
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