Method for controlling air conditioner system

A method for controlling an air conditioner system which comprises one or more network groups for a wireless communication, each of the one or more network-groups comprising an outdoor unit and a plurality of indoor units connected via a refrigerant pipe, the method comprising:

• receiving, from the outdoor unit or the plurality of indoor units of a particular network group of the one or more network groups, a setting command;
• transmitting, by the outdoor unit belonging to the particular network group, a channel scan command to the plurality of indoor units belonging to the particular network group;
• performing channel scans by the outdoor unit and each of the plurality of indoor units;
• transmitting, by the plurality of indoor units, results of the channel scans to the outdoor unit;
• determining, by the outdoor unit, a communications channel to be used for the particular network group based on a result of the channel scan performed by the outdoor unit and the results of the channel scans received from the plurality of indoor units;
• and
• outputting, by the outdoor unit, information on the determined communications channel to the plurality of indoor units, wherein the performing of the channel scan comprises measuring a load occupancy rate of a plurality of channels, and the determining of the communications channel to be used comprises, when there is only one channel of the plurality of channels having a load occupancy rate of 0%, selecting the channel having the load occupancy rate of 0%.