Air conditioner

An air conditioner comprising

• an indoor unit and an outdoor unit that are coupled by a liquid pipe and a gas pipe,
• the outdoor unit having a compressor, a flow passage switching unit, an outdoor heat exchanger, an outdoor expansion valve, an outdoor fan, a suction pressure detector, a suction temperature detector, and an outdoor unit controller,
• the suction pressure detector detecting suction pressure that is pressure of a refrigerant suctioned into the compressor,
• the suction temperature detector detecting a suction temperature that is a temperature of the refrigerant suctioned into the compressor, and
• the outdoor unit controller controlling the outdoor fan in accordance with the detected suction pressure when the outdoor heat exchanger functions as an evaporator, wherein
• the outdoor unit controller calculates a suction superheating degree that is a superheating degree of the refrigerant suctioned into the compressor by using the detected suction pressure and the detected suction temperature,
• the outdoor unit controller controls the outdoor fan such that the suction pressure becomes equal to or more than first threshold pressure that is higher by a predetermined value than evaporation pressure and lower than second threshold pressure that is higher than the same first threshold pressure when the suction superheating degree is equal to or less than a predetermined threshold superheating degree, the evaporation pressure corresponding to a temperature of the outdoor heat exchanger at which the outdoor heat exchanger is frosted, and
• the outdoor unit controller controls the outdoor fan such that the suction superheating degree becomes equal to or less than the threshold superheating degree when the suction superheating degree is higher than the threshold superheating degree and the suction pressure is lower than the second threshold pressure.