JP2550094B

PURPOSE:To improve the followability to a set temperature and comfortableness by carrying out a maximum capacity operation which makes the compressor rotational speed maximum, releasing the maximum capacity operation at a point in time where the room temperature reaches a predetermined value, and transferring the rotational speed to a control of the rotational speed determined by the temperature difference between the room temperature and the set temperature after passing a time for fixing the rotational speed higher than a minimum value. CONSTITUTION:Inputs which becomes objects of the control of the rotational number of a compressor are room temperature data (a) and a set value (b). The difference between both two data is calculated by a data editing circuit (c) and transferred to a control circuit (d) and sent into a compressor motor (e), thus outputting a rotational speed output value (f). Whether or not a maximum capacity operation, in which the maximum compressor rotational speed is to be carried out, is determined by the room temperature data (a), the set temperature (b) and the data editing circuit (c). In the case of the operation, the later release of the operation is determined by the data editing circuit (c) depending on time and previously described two inputs. Thereafter, a function to continue to send an illustrated rotational speed during a fixed rotational time T1 for a predetermine time within the large capacity operational time T is provided in the data editing circuit (c), and therefore, the operation can be stopped or generation of the temperature difference can be reduced.