Control system in variable air volume type air conditioner

A variable air volume type air conditioner is provided to mount human existence sensors in respective spaces for preventing cooling and heating operations from being driven for an unoccupied space, thereby improving energy consumption. A variable air volume type air conditioner includes a variable air volume control unit(40) having a human existence sensor(110) mounted in each space for determining existence of a human being therein. A room temperature sensor(50) measures a current room temperature and transmits the sensing result to a variable air volume controller(43). A variable air volume type damper(41) is controlled in opening degree according to a signal output from the human existence sensor. A damper actuator(42) controls opening or closing of the variable air volume type damper. An existence controller(120) is to carry out cooling or heating operation by manual control regardless of the operation of the human existence sensor.