multi-concected split type Flexible system control-multple outdoor units commectes with multiple insoor units,makes room temperature adjustment possible,cnve-nient and flexible. Intellctual microcomputer control-advanced microcomputer control is adopted,functions of selt-fetection of fault,anti-cold wind protection,automatic defrosting in winter,automatic starting of electric heater,remote indoor operation and monitoring are enabled. Convenient installation and maintenance,effective space saving-the indoor unit,compactand super thin,can be installed inside the ceiling,can save space;installation and maintenance made convenient by the flexible wiring system.