Refrigeration system comprising A) an ejector circuit comprising in the direction of flow of a circulating refrigerant: Aa) a high pressure compressor unit comprising at least one compressor (2a, 2b, 2c, 2d); Ab) a heat rejecting heat exchanger/gas cooler; Ac) an ejector having a primary inlet fluidly connected to an outlet of the heat rejecting heat exchanger/gas cooler; a secondary inlet; and an outlet, which is fluidly connected to Ad) a receiver having a gas outlet which is connected to an inlet of the high pressure compressor unit; B) a normal cooling temperature flowpath comprising in the direction of flow of the refrigerant: Ba) a normal cooling temperature expansion device fluidly connected to a liquid outlet of the receiver; Bb) a normal cooling temperature evaporator; Bc) an ejector secondary inlet line with an ejector inlet valve fluidly connecting an outlet of the normal cooling temperature evaporator to the secondary inlet of the ejector; and Bd) a normal cooling temperature flowpath valve unit configured for fluidly connecting the inlet of the high pressure compressor unit selectively either to the gas outlet of the receiver or to the outlet of the normal cooling temperature evaporator; characterized in that the refrigeration system further comprises: C) a freezing temperature flowpath comprising in the direction of flow of the refrigerant: Ca) a freezing temperature expansion device fluidly connected to the liquid outlet of the receiver; Cb) a freezing temperature evaporator; Cc) a freezing temperature compressor unit comprising at least one freezing temperature compressor (18a, 18b); and Cd) a freezing temperature flowpath valve unit configured for fluidly connecting the outlet of the freezing temperature compressor unit selectively either to the inlet of the high pressure compressor unit or to the ejector inlet valve. A) an ejector circuit comprising in the direction of flow of a circulating refrigerant: Aa) a high pressure compressor unit comprising at least one compressor (2a, 2b, 2c, 2d); Ab) a heat rejecting heat exchanger/gas cooler; Ac) an ejector having a primary inlet fluidly connected to an outlet of the heat rejecting heat exchanger/gas cooler; a secondary inlet; and an outlet, which is fluidly connected to Ad) a receiver having a gas outlet which is connected to an inlet of the high pressure compressor unit; Aa) a high pressure compressor unit comprising at least one compressor (2a, 2b, 2c, 2d); Ab) a heat rejecting heat exchanger/gas cooler; Ac) an ejector having a primary inlet fluidly connected to an outlet of the heat rejecting heat exchanger/gas cooler; a secondary inlet; and an outlet, which is fluidly connected to Ad) a receiver having a gas outlet which is connected to an inlet of the high pressure compressor unit; B) a normal cooling temperature flowpath comprising in the direction of flow of the refrigerant: Ba) a normal cooling temperature expansion device fluidly connected to a liquid outlet of the receiver; Bb) a normal cooling temperature evaporator; Bc) an ejector secondary inlet line with an ejector inlet valve fluidly connecting an outlet of the normal cooling temperature evaporator to the secondary inlet of the ejector; and Bd) a normal cooling temperature flowpath valve unit configured for fluidly connecting the inlet of the high pressure compressor unit selectively either to the gas outlet of the receiver or to the outlet of the normal cooling temperature evaporator; Ba) a normal cooling temperature expansion device fluidly connected to a liquid outlet of the receiver; Bb) a normal cooling temperature evaporator; Bc) an ejector secondary inlet line with an ejector inlet valve fluidly connecting an outlet of the normal cooling temperature evaporator to the secondary inlet of the ejector; and Bd) a normal cooling temperature flowpath valve unit configured for fluidly connecting the inlet of the high pressure compressor unit selectively either to the gas outlet of the receiver or to the outlet of the normal cooling temperature evaporator; Ca) a freezing temperature expansion device fluidly connected to the liquid outlet of the receiver; Cb) a freezing temperature evaporator; Cc) a freezing temperature compressor unit comprising at least one freezing temperature compressor (18a, 18b); and Cd) a freezing temperature flowpath valve unit configured for fluidly connecting the outlet of the freezing temperature compressor unit selectively either to the inlet of the high pressure compressor unit or to the ejector inlet valve.