AIR CONDITIONER AND CONTROLLING METHOD THEREOF

PROBLEM TO BE SOLVED: To enable stable execution of a control and a refrigerating cycle operation by determining the amount of change of a control means in the lower priority order by an operation of a control means in the higher priority order out of first, second and third control means and by modifying the amount of operation of the control means in the lower priority order in accordance with the amount of change. SOLUTION: A control device 20 determines the amount of change of a control means in the lower priority order by an operation of a control means in the higher priority order out of a first control means which regulates the capacity of a compressor 1 in accordance with a difference between an indoor temperature detected by an indoor temperature sensor 15 and a set value of the indoor temperature and controls the indoor temperature, a second control means which regulates the quantity of airflow of an indoor-side blower 13 in accordance with a difference between an outlet air temperature detected by an outlet temperature sensor 16 and a set value of the outlet air temperature and controls the outlet air temperature and a third control means which determines the opening of an expansion valve 5. In accordance with the amount of change thus determined, the amount of operation of the control means in the lower priority order is modified. Accordingly, a control and a refrigerating cycle operation being free from a phenomenon of hunting can be executed stably.