Motor vehicle air conditioning system has conditioning control unit that controls the circulation switching unit and switches to hot gas heating cycle when outside air temperature is equal or smaller than predetermined value

摘要

The air conditioning system includes a normal refrigerating cycle, a hot gas heating cycle. A circulation switching unit switches between the refrigerating cycle and the hot gas heating cycle. The outer temperature is detected by an outside air temperature detection unit (46). A conditioning control unit controls the circulation switching unit and switches to the hot gas heating cycle when the outside air temperature is equal or smaller than a predetermined value.