Patent ID: 7509816

Claim:
An air conditioner comprising: a capacity variable compressor unit; an outdoor side heat exchanger; a pressure reduction valve; an indoor side heat exchanger, said a capacity variable compressor unit, said outdoor side heat exchanger, said pressure reduction valve and said indoor side heat exchanger constituting a cooling medium circulation line; a control unit operatively connected to the capacity variable compressor unit; a temperature setting device electrically connected to the control unit for setting a predetermined temperature; an outdoor temperature sensor electrically connected to the control unit and adapted to detect an outdoor temperature; an indoor temperature sensor electrically connected to the control unit and adapted to detect an indoor temperature; and a humidity sensor electrically connected to the control unit and adapted to detect a humidity of the indoor side, said control unit including: (i) capacity determining means for determining a capacity of the capacity variable compressor unit in accordance with a temperature data from the indoor temperature sensor and the temperature setting device, (ii) memory addressing means into which information of outdoor temperature and indoor humidity is inputted, (iii) memory means in which a maximally allowable capacity to be read out in relation to the indoor humidity is stored, and (iv) maximum capacity limiting means for limiting the capacity of the capacity variable compressor unit determined in accordance with the temperature data to a value less than the maximally allowable capacity read out from the memory means, wherein said temperature data includes temperature difference between the detected indoor temperature and the set temperature along with temperature variation.