Control Specification (09/12 Class) SiUS04-702
40 Function and Control
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 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 sec. from operation
start.
Control in Each Zone
The heat exchange intermediate temperature of indoor unit controls the following.
3.8 Fan Control
Outline Fan control is carried out according to the following priority.
1. Fan control when defrosting
2. Fan OFF delay when stopped
3. ON/OFF control when cooling operation
4. Tap control when drooping function is working
5. Fan control when forced operation
6. Fan control in low noise mode
7. Fan control during heating operation
8. Fan control in the quiet mode
9. Fan control in the powerful mode
10.Fan control for pressure difference upkeep
Detail Fan OFF Control when Stopped
Fan OFF delay for 60 seconds must be made when the compressor is stopped.
3.9 Liquid Compression Protection Function 2
Outline In order to obtain the dependability of the compressor, the compressor must be stopped according
to the conditions of the temperature of the outdoor air and outdoor heat exchanger.
Detail
Operation stop depending on the outdoor air temperature.
Compressor operation turns OFF under the conditions that the system is in cooling operation and
outdoor air temperature is below 14°F.
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