Air-conditioning apparatus

An air-conditioning apparatus comprising:

• a refrigerant circuit, in which a compressor, a refrigerant flow switching device, a heat source-side heat exchanger, an expansion device, and a use-side heat exchanger are connected via a refrigerant pipe to form a refrigeration cycle;
• a pressure sensor configured to detect a pressure on a suction side of the compressor;
• and
• a controller configured to, in a defrosting operation, control the refrigerant flow switching device to supply compressed refrigerant from the compressor to the heat source-side heat exchanger, compare a value detected by the pressure sensor with a first threshold value, and change a defrosting operation time period based on a result of the comparison, the defrosting operation time period comprising a first defrosting operation time period and a second defrosting operation time period which is shorter than the first defrosting operation time period,
• periodically perform processing of comparing the value detected by the pressure sensor with a second threshold value which is more than the first threshold value, and decrease a frequency of the compressor when the value detected by the pressure sensor is less than the second threshold value,
• the controller being configured to
• set the defrosting operation time period to the first defrosting operation time period when the value detected by the pressure sensor is the first threshold value or more, and
• set the defrosting operation time period to the second defrosting operation time period when the value detected by the pressure sensor is less than the first threshold value.