Refrigerant system and method for controlling the same

PURPOSE: A refrigerant system and a method for controlling the same are provided to perform cooling functions even though a main compressor is malfunctioning. CONSTITUTION: A refrigerant system comprises an air conditioning part(1), cooling parts(2, 3), a refrigerant heat exchanger, a cooling side compressor. The air conditioning part and the cooling parts are operated using a refrigerant cycle. The refrigerant heat exchanger is installed such that the heat is exchanged between the air conditioning part and the cooling parts. The cooling side compressor comprises a main compressor(211) and an auxiliary compressor(212). The main compressor is used for basic cooling of foods. The auxiliary compressor is operated when the main compressor malfunctions.