| 摘要 |
In a monitoring system 1, operation data on an air-conditioning apparatus 31 is exchanged between the air-conditioning apparatus 31 and a management apparatus 61. The management apparatus 61 includes a failure cause diagnosis unit 303 that diagnoses the cause of a failure of the air-conditioning apparatus 31 on the basis of the operation data. A refrigeration capacity abnormality determination value for determining whether a refrigeration capacity calculated from the operation data on the air-conditioning apparatus 31 is abnormal and a refrigeration capacity change rate abnormality determination value for determining whether a refrigeration capacity change rate of the refrigeration capacity with respect to time is abnormal are set in the failure cause diagnosis unit 303. The failure cause diagnosis unit 303 determines that the air-conditioning apparatus 31 is in a failed state if the refrigeration capacity is less than or equal to the refrigeration capacity abnormality determination value. The failure cause diagnosis unit 303 determines that the cause of the failure of the air-conditioning apparatus 31 is not aging degradation if the refrigeration capacity change rate of the refrigeration capacity is greater than the refrigeration capacity change rate abnormality determination value, and determines that the cause of the failure of the air-conditioning apparatus 31 is aging degradation if the refrigeration capacity change rate of the refrigeration capacity is not greater than the refrigeration capacity change rate abnormality determination value. |
