SiBE04-824Function and Control 15Part 4Function and Control1. Main Functions......................................................................................161.1 Frequency Principle................................................................................161.2 Airflow Direction Control.........................................................................181.3 Fan Speed Control for Indoor Units........................................................191.4 Programme Dry Function .......................................................................201.5 Automatic Operation...............................................................................211.6 Thermostat Control.................................................................................221.7 NIGHT SET Mode ..................................................................................231.8 ECONO Mode ........................................................................................241.9 INTELLIGENT EYE ................................................................................251.10 Inverter POWERFUL Operation .............................................................271.11 Other Functions......................................................................................282. Function of Thermistor ..........................................................................303. Control Specification .............................................................................313.1 Mode Hierarchy ......................................................................................313.2 Frequency Control..................................................................................323.3 Controls at Mode Changing / Start-up....................................................343.4 Discharge Pipe Temperature Control.....................................................363.5 Input Current Control..............................................................................373.6 Freeze-up Protection Control .................................................................383.7 Heating Peak-cut Control .......................................................................383.8 Fan Control.............................................................................................393.9 Liquid Compression Protection Function 2.............................................393.10 Defrost Control .......................................................................................403.11 Electronic Expansion Valve Control .......................................................413.12 Malfunctions ...........................................................................................443.13 Forced Operation Mode .........................................................................453.14 Additional Function.................................................................................453.15 Facility Setting Jumper (cooling at low outdoor temperature) ................46