The present invention relates to a refrigerant valve control device and a control method thereof, which adjusts eccentricity of a refrigerant valve during an operation of a refrigerator to prevent overcooling. The suspension includes a forward attachment device between the hub of the intermediate casing and the pylon, a rear attachment device between the exhaust casing and the pylon, and a connection device rigidly connecting the intermediate casing to the pylon. The fuel management system may include installation records of the fuel handling components. The single robot is configured to transfer a first exchangeable object from a loading station to the processing unit and to transfer a second exchangeable object from the processing unit to a discharge station.