A storage device of a system control device stores grouping information that defines an association among a refrigerant sensor, a plurality of indoor units, at least one outdoor unit, and a plurality of refrigerant leakage suppression devices. When refrigerant leakage is detected by the refrigerant sensor, the system control device performs a process for specifying, from the plurality of indoor units, an indoor unit in which the refrigerant leakage has occurred. Further, the system control device makes reference to the grouping information to operate a refrigerant leakage suppression device corresponding to the indoor unit specified by performing the above-described process.