Air conditioner and controlling method thereof

A method of controlling an air conditioner, the method comprising:

• acquiring a reference index value, during an operation, based on
• a reference pressure measured along a first flow path including an outlet of a compressor and an inlet of a heat exchanger, and
• a reference temperature measured along a second flow path including an outlet of the heat exchanger;
• acquiring a measurement index value, during a preset cycle after the operation, based on a measurement pressure measured along the first flow path and a measurement temperature measured along the second flow path;
• controlling displaying of, a status indicating a shortage of a refrigerant based on a comparison of the reference index value and the measurement index value, and
• stopping the compressor based on the reference index value and the measurement index value.

An air conditioner comprising:

• a compressor;
• a heat exchanger connected to the compressor;
• a pressure sensor provided along a first flow path of refrigerant, the first flow path including an outlet of the compressor and an inlet of the heat exchanger;
• a temperature sensor provided along a second flow path of the refrigerant, the second flow path including an outlet of the heat exchanger;
• and
• a processor operatively connected to the compressor, the pressure sensor, and the temperature sensor, the processor configured to:
• in response to an injection of the refrigerant into the air conditioner, acquire a reference index value, during a reference time, based on a first reference pressure measured by the pressure sensor and a first reference temperature measured by the temperature sensor,
• acquire a measurement index value, during a preset cycle after acquiring the reference index value, based on a first measurement pressure measured by the pressure sensor and a first measurement temperature measured by the temperature sensor,
• display a status indicating a shortage of the refrigerant based on a ratio of the measurement index value and the reference index value, and
• stop the compressor based on the reference index value and the measurement index value.