Air-conditioning apparatus and refrigerant leakage detection method

An air-conditioning apparatus comprising:

• an outdoor unit including at least a compressor and an outdoor pipe;
• an indoor unit including at least an indoor heat exchanger, an indoor fan, and an indoor pipe;
• an extension pipe connecting the outdoor pipe and the indoor pipe to each other;
• a first temperature sensor disposed under a plurality of brazed portions connecting the indoor heat exchanger and the indoor pipe to each other;
• and
• a control unit configured to determine whether a refrigerant having a higher specific gravity than indoor air is leaking from any of the brazed portions, on the basis of a change in a temperature detected by the first temperature sensor, while the indoor fan is stopped,
• wherein a first leaked refrigerant receiver is disposed under the plurality of brazed portions and the first temperature sensor is disposed in the first leaked refrigerant receiver,
• the indoor heat exchanger includes a radiator plate and a heat-transfer pipe extending through the radiator plate,
• the indoor pipe comprises a gas-side indoor pipe and a liquid-side indoor pipe,
• a header main pipe and a header branch pipe that is connected to the header main pipe are positioned between the gas-side indoor pipe and the indoor heat exchanger,
• an indoor refrigerant branch pipe is positioned between the liquid-side indoor pipe and the indoor heat exchanger, and
• the plurality of brazed portions includes a brazed portion between the header main pipe and the header branch pipe, a brazed portion between the header branch pipe and a first end of the heat-transfer pipe, a brazed portion between a second end of the heat-transfer pipe and the indoor refrigerant branch pipe, and a brazed portion between the indoor refrigerant branch pipe and the liquid-side indoor pipe.