Si21-205Function and Control 73Part 7Function and Control1. Indoor Unit.............................................................................................741.1 Function Outline .................................................................................... 741.2 Electric Function Parts........................................................................... 751.3 Function Details..................................................................................... 762. Outdoor Unit (25/35 class) ....................................................................862.1 Function of Thermistor........................................................................... 862.2 Mode Hierarchy ..................................................................................... 882.3 Frequency Control ................................................................................. 892.4 Controls at Mode Changing / Start-up ................................................... 912.5 Discharge Pipe Temperature Control .................................................... 922.6 Input Current Control ............................................................................. 922.7 Freeze-up Protection Control ................................................................ 932.8 Heating Peak-cut Control ...................................................................... 932.9 Fan Control............................................................................................ 942.10 Moisture Protection Function 1(Securing of Differential Pressure and Blown Air Temperature)............ 942.11 Moisture Protection Function 2.............................................................. 952.12 Defrost Control ...................................................................................... 962.13 Electronic Expansion Valve Control ...................................................... 972.14 Malfunctions ........................................................................................ 1002.15 Forced Operation Mode....................................................................... 1012.16 Voltage Detection Function ................................................................. 1013. Outdoor Unit (50/60 class) ..................................................................1023.1 Function of Thermistor......................................................................... 1023.2 Mode Hierarchy ................................................................................... 1043.3 Frequency Control ............................................................................... 1053.4 Controls at Mode Changing / Start-up ................................................. 1073.5 Discharge Pipe Temperature Control .................................................. 1083.6 Input Current Control ........................................................................... 1083.7 Freeze-up Protection Control .............................................................. 1093.8 Heating Peak-cut Control .................................................................... 1093.9 Fan Control.......................................................................................... 1103.10 Moisture Protection Function 2............................................................ 1103.11 Low Hz High Pressure Limit ................................................................ 1113.12 Defrost Control .................................................................................... 1113.13 Electronic Expansion Valve Control .................................................... 1123.14 Malfunctions ........................................................................................ 1153.15 Forced Operation Mode....................................................................... 1163.16 Voltage Detection Function ................................................................. 116
