| 摘要 |
PURPOSE:To prevent generation of seizure or the like in a bearing metal of a compressor with less operating power by providing a control means which temporarily stops operation of a fixed power type compressor when a power variable type compressor is operated for a predetermined time with operating power less than the operating power of the fixed power type compressor. CONSTITUTION:At the time of performing simultaneously room-cooling and room-heating operations, for instance, by comparing two-horsepower operation of room-heating in-room unit 5a with seven-horsepower total value of operating power of room-heating in-room units 5b, 5c, the operation is performed so as to be suited for the larger power of seven-horsepower with a fixed power type compressor 2a by four-horsepower and a power variable type compressor 2b by three-horsepower. After a 90-minute operation time in which operating power of the power variable type compressor 2b is thus less than the operating power of the fixed power type compressor 2a, it is stopped for three minutes by a signal from a control means 21. Thus by guiding lubricating oil, accumulated in the fixed power type compressor 2a, to the power variable type compressor 2b via an oil-equalizer pipe 17, possibility of seizure in a bearing metal or the like of the power variable type compressor 2b is eliminated. |
