Service Manual

SiUS121502E
Function and Control 33
Part 4
Function and Control
1. Function of CTXS, FTXS, CDXS, FDXS, FVXS Series ............................34
1.1 Temperature Control .................................................................................. 34
1.2 Frequency Principle.................................................................................... 34
1.3 Airflow Direction Control (CTXS, FTXS, FVXS Series) .............................. 36
1.4 Fan Speed Control for Indoor Unit ............................................................. 39
1.5 Program Dry Operation .............................................................................. 40
1.6 Automatic Operation................................................................................... 41
1.7 Thermostat Control..................................................................................... 42
1.8 NIGHT SET Mode ...................................................................................... 43
1.9 ECONO Operation ..................................................................................... 43
1.10 INTELLIGENT EYE Operation (CTXS, FTXS Series)................................ 44
1.11 Inverter POWERFUL Operation ................................................................. 45
1.12 Clock Setting .............................................................................................. 46
1.13 WEEKLY TIMER Operation (CTXS, FTXS, FVXS series) ......................... 47
1.14 Other Functions.......................................................................................... 53
2. Function of FFQ Series .............................................................................54
2.1 Drain Pump Control.................................................................................... 54
2.2 Thermostat Sensor in Remote Controller................................................... 56
2.3 Freeze Prevention Control ......................................................................... 58
2.4 Hot Start Control (In Heating Operation Only)............................................ 59
3. Control Specification .................................................................................60
3.1 Function of Thermistor ............................................................................... 60
3.2 Mode Hierarchy .......................................................................................... 62
3.3 Frequency Control...................................................................................... 63
3.4 Controls at Mode Changing / Start-up........................................................ 65
3.5 Discharge Pipe Temperature Control......................................................... 66
3.6 Input Current Control.................................................................................. 67
3.7 Freeze-up Protection Control ..................................................................... 68
3.8 Heating Peak-cut Control ........................................................................... 68
3.9 Outdoor Fan Control................................................................................... 69
3.10 Liquid Compression Protection Function.................................................... 69
3.11 Defrost Control ........................................................................................... 70
3.12 Low Hz High Pressure Limit ....................................................................... 71
3.13 Electronic Expansion Valve Control ........................................................... 72
3.14 Malfunctions ............................................................................................... 77