Air conditioner

An air conditioner comprising:

• a refrigerant circuit connecting a first indoor heat exchanger, a second indoor heat exchanger and an outdoor heat exchanger by a refrigerant pipe in which refrigerant is enclosed, the first indoor heat exchanger and the second indoor heat exchanger connected in parallel, the outdoor heat exchanger connected in series to the first indoor heat exchanger and the second indoor heat exchanger, the refrigerant circuit having a compressor, an accumulator and a four-way valve, the compressor, the accumulator and the four-way valve connected between the first and second indoor heat exchangers and the outdoor heat exchanger;
• a first indoor unit casing housing the first indoor heat exchanger;
• a second indoor unit casing housing the second indoor heat exchanger;
• a first leak detector configured to detect a leak of the refrigerant inside the first indoor unit;
• a second leak detector configured to detect a leak of the refrigerant inside the second indoor unit;
• a first isolator configured to isolate the first indoor heat exchanger from the refrigerant circuit;
• a second isolator configured to isolate the second indoor heat exchanger from the refrigerant circuit;
• a controller configured to, when at least one of the first leak detector and the second leak detector detects the leak of the refrigerant, operate the compressor while the four-way valve is set to a cooling direction to perform a pump-down operation in which the refrigerant is collected to a side of the outdoor heat exchanger, and
• a pressure sensor configured to detect pressure of the refrigerant in the refrigerant pipe on the side of the outdoor heat exchanger,
• the controller configured
• to isolate the second indoor heat exchanger from the refrigerant circuit by the second isolator in the pump-down operation when the first leak detector detects the leak of the refrigerant and the second leak detector does not detect the leak of the refrigerant,
• to isolate the first indoor heat exchanger from the refrigerant circuit by the first isolator in the pump-down operation when the second leak detector detects the leak of the refrigerant and the first leak detector does not detect the leak of the refrigerant,
• to end the pump-down operation when the pressure of the refrigerant in the refrigerant pipe on the side of the outdoor heat exchanger has become equal to or lower than a pressure set in advance, and
• to operate the compressor while the four-way valve is set to a heating direction when a time set in advance has elapsed since the pump-down operation is started but the pressure of the refrigerant in the refrigerant pipe on the side of the outdoor heat exchanger has not become equal to or lower than the pressure set in advance.