Patent ID: 8733119

Claim:
An air conditioning equipment, comprising: a refrigerant pipe; an in-room unit which is connected to one end of the refrigerant pipe; and an out-room unit which is connected to the other end of the refrigerant pipe; wherein the out-room unit includes a coupler which couples an electric control signal for controlling the in-room unit to the refrigerant pipe so as to transmit a first radio wave signal which is radiated from the refrigerant pipe due to generation of an electromagnetic field owing to the coupling, to the in-room unit through a free space, and which extracts a second radio wave signal transmitted along a surface layer of the refrigerant pipe from the in-room unit and then converts the second radio wave signal into an electric control signal for controlling the out-room unit; and wherein the in-room unit includes a radio-wave transmission/reception portion which excites the second radio wave signal in the refrigerant pipe through the free space so as to transmit the excited second radio-wave signal to the out-room unit along the surface layer of the refrigerant pipe, and which receives the first radio wave signal radiated from the out-room unit into the free space.