Air-conditioner, air-conditioning system, and method for monitoring air-conditioner

An air-conditioner comprising:

• an air channel;
• a fan configured to cause an airflow passing through the air channel;
• a heat exchanger disposed in the air channel to cause a heat-exchange between refrigerant flowing therein and air passing therethrough;
• refrigerant pipes for supplying refrigerant to the heat exchanger and discharging the refrigerant from the heat exchanger;
• a semi-conductor gas sensor disposed in the air channel and reactive to at least predetermined refrigerant to output a detection value indicating a level of intensity of reaction of the semiconductor gas sensor;
• and
• a processor configured to perform
• a first determination to determine that a refrigerant leakage has occurred on condition that the detection value is equal to or greater than a first threshold when the fan is in operation;
• a second determination to, if the detection value is equal to or greater than a second threshold when the fan is not in operation, start operation of the fan as a provisional operation, stop the provisional operation of the fan, and determine that a refrigerant leakage has occurred on condition that the detection value is equal to or greater than a third threshold after stopping the provisional operation of the fan, the second threshold being the same as or different from the first threshold, the third threshold being the same as or different from each of the first threshold and the second threshold;
• and
• detection result utilization to take a predetermined action for outputting alarm information and/or limiting supply of refrigerant to the heat exchanger when a refrigerant leakage is determined to have occurred by any one of the first and second determinations.