| 摘要 |
PROBLEM TO BE SOLVED: To suppress the composition difference between a sealed nonazeotropic mixture refrigerant and a circulating refrigerant to a minimum at either air cooling or heating mode. SOLUTION: A compressor 1 is inserted and connected through a first refrigerant passage switchover unit 2 in one refrigerant passage connecting an indoor heat exchanger 3 and an outdoor heat exchanger 10, a liquid receiver 8 and a decompressor 9 are inserted and connected through second refrigerant passage changeover units (4, 5, 6, 7) in another refrigerant passage connecting the indoor heat exchanger and the outdoor heat exchanger, whereby the nonazeotropic mixture refrigerant of at least two kinds of refrigerants is circulated in the refrigerant passage and the first and second refrigerant passage changeover units are changed over to form an air cooling/heating refrigeration cycle. A capacitance detector 20 is provided for detecting the capacitance of the refrigerant flowing from the receiver to the decompressor, and the compressor is stopped when the detector detects the gas refrigerant being flowing, thereby suppressing the composition difference between the sealed refrigerant and the circulating refrigerant to a minimum and preventing damage due to feeding of the gas refrigerant to the compressor. |
