(57) The composition of a refrigerant within the refrigeration cycle in which a non-azeotrope
refrigerant is used is controlled to a predetermined composition. Further, the amount
of the refrigerant is detected, and the composition and amount of the refrigerant
within the refrigeration cycle are displayed, facilitating the maintenance of the
refrigerant. The refrigeration cycle includes a compressor (1), a heat-source-side
heat exchanger (2), use-side heat exchangers (20a,20b), and a pressure reducing apparatus
(7,21a,21b), in which cycle a non-azeotrope refrigerant is used as a refrigerant.
The refrigeration cycle further includes a sensor (8), disposed in a pipe portion
where a liquid phase is formed, for detecting the composition of the non-azeotrope
refrigerant circulating within the refrigeration cycle, and devices (5,6,10) for controlling
the composition to a predetermined composition, a sensor for detecting the amount
of refrigerant and a device for displaying the amount of the refrigerant. Since the
composition of the refrigerant circulating within the refrigeration cycle is detected
and control appropriate for the detected composition is performed, it becomes possible
to perform a stable operation even when the refrigerant leaks outside and the composition
of the refrigerant varies.
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