the invention relates to refrigerating systems , primarily , to refrigerating systems employing compressors with economizing inlets and multi - pass condensers . in accordance with the invention a refrigerating system with economizing cycle employs a compressor unit with an economizer inlet and a condenser unit having a first condensation stage , a second condensation stage , and means to remove liquid refrigerant portion between the condensation stages . an intermediate liquid outlet from the first condensation stage feeds a circuit with the evaporator and a liquid outlet from the second condensation stage feeds a circuit with the economizer inlet . the invention provides a high efficiency refrigerating system incorporating of advantages of cost - effectiveness provision of liquid sub - cooling or / and liquid temperature inherent for refrigerating systems with economizing cycle and cost - effectiveness advantages of two - stage condensation condensers .