SiUS12-928_Bii Table of Contents1. Indoor Unit.................................................................................................171.1 CTXS07JVJU, CTXS09/12HVJU, FTXS15/18HVJU.................................. 171.2 CTXS07LVJU, FTXS09/12LVJU ................................................................ 191.3 FTXS15/18LVJU ........................................................................................ 221.4 FDXS09/12DVJU ....................................................................................... 251.5 FDXS09/12LVJU, CDXS15/18LVJU .......................................................... 272. Outdoor Unit..............................................................................................292.1 2MXS18GVJU ............................................................................................ 292.2 3MXS24JVJU, 4MXS32GVJU.................................................................... 32Part 4Function and Control........................................................... 341. Main Functions..........................................................................................351.1 Temperature Control .................................................................................. 351.2 Frequency Principle.................................................................................... 351.3 Airflow Direction Control (CTXS/FTXS Series) .......................................... 371.4 Fan Speed Control for Indoor Unit ............................................................. 391.5 Program Dry Operation .............................................................................. 401.6 Automatic Operation................................................................................... 411.7 Thermostat Control..................................................................................... 421.8 NIGHT SET Mode ...................................................................................... 441.9 ECONO Operation ..................................................................................... 451.10 HOME LEAVE Operation ........................................................................... 461.11 INTELLIGENT EYE Operation (CTXS/FTXS Series)................................. 471.12 Inverter POWERFUL Operation ................................................................. 481.13 Other Functions.......................................................................................... 492. Function of Thermistor ..............................................................................513. Control Specification .................................................................................543.1 Mode Hierarchy .......................................................................................... 543.2 Frequency Control...................................................................................... 553.3 Controls at Mode Changing / Start-up........................................................ 573.4 Discharge Pipe Temperature Control......................................................... 583.5 Input Current Control.................................................................................. 593.6 Freeze-up Protection Control ..................................................................... 593.7 Heating Peak-cut Control ........................................................................... 603.8 Outdoor Fan Control................................................................................... 613.9 Liquid Compression Protection Function.................................................... 613.10 Defrost Control ........................................................................................... 623.11 Low Hz High Pressure Limit ....................................................................... 633.12 Outdoor Electronic Expansion Valve Control ............................................. 633.13 Malfunctions ............................................................................................... 68Part 5Operation Manual ................................................................ 701. System Configuration................................................................................712. CTXS-J, CTXS-H, FTXS-H Series ............................................................72