Air-conditioner system and control method, with first and second abnormality diagnosis

An air conditioner system comprising:

• a plurality of air-conditioners;
• a management server configured to receive air-conditioner data from the plurality of air-conditioners, to store the received air-conditioner data in a memory of the management server, and to analyze at least a portion of the received air-conditioner data to determine a state of one of the air-conditioners;
• and
• a database configured to store the air-conditioner data,
• wherein the management server is configured to analyze the portion of the air-conditioner data to perform a first diagnosis of the one of the air-conditioners, and the management server is configured to perform a second diagnosis of the one of the air conditioners during a first period, based on a result of the first diagnosis,
• wherein the management server includes:
• a diagnosing unit for analyzing the air-conditioner data to determine whether the portion of the air-conditioner data corresponds to a normal state, an abnormal state, or a failure state,
• wherein when the corresponding air conditioner is determined to be in the abnormal state based on the first diagnosis, the diagnosing unit is to provide a first abnormality-event count and determine abnormality or failure, based on the first abnormality-event count, whether abnormality events occur consecutively during a short term, in the first diagnosis,
• wherein when the abnormality events are determined to occur consecutively based on the first diagnosis, the diagnosing unit is configured to determine that the corresponding air conditioner is in the failure state,
• wherein when a corresponding air conditioner is determined to be in the abnormal state based on the first diagnosis, the diagnosing unit is configured to provide a second abnormality-event count for the second diagnosis and determine abnormality or failure of the air conditioner based on the second abnormality-event count during the first period, in the second diagnosis,
• wherein when the second abnormality-event count equals a reference count during the first period, the diagnosing unit determines that the corresponding air conditioner is in the abnormal state.