Air conditioning system and management device

An air conditioning system comprising:

• a communication device including
• an electricity generator to generate electricity by receiving light;
• a wireless transmitter to receive a supply of the electricity generated by the electricity generator and to transmit communication data wirelessly;
• and
• a communication controller configured to control the transmitter to transmit the communication data on a periodic basis, and
• an air conditioner including
• an air-conditioner main body to perform air conditioning;
• and
• an operation controller to control the air-conditioner main body, and configured to
• determine, while an operation state of the air-conditioner main body is in a stop, whether the communication data is not transmitted for a predetermined transmission time by the wireless transmitter indicating that light is not being received by the electricity generator of the communication device, and
• responsive to determining that the communication data is not transmitted in the stop, cause the operation state to be in a setback, the setback being a state in which the air conditioning is performed by the air-conditioner main body so that a temperature in a space where the air conditioner is placed does not exceed a predetermined limit temperature, the stop being a state in which the air conditioning is not performed by the air-conditioner main body.