Air conditioner

An air conditioner, comprising:

• an outdoor unit comprising a compressor;
• a plurality of indoor units connected to the outdoor unit, each having an indoor heat exchanger and disposed in a different space;
• a low pressure pipe that connects the indoor heat exchanger and the compressor and in which a low pressure gaseous refrigerant flows;
• a switching device comprising a low pressure valve disposed between the indoor heat exchanger and the low pressure pipe;
• an indoor temperature sensor that measures a temperature of a space in which an indoor unit of the plurality of indoor units is disposed;
• and
• a controller that is electrically connected to the indoor temperature sensor and adjusts an opening degree of the low pressure valve, wherein the controller adjusts the opening degree of the low pressure valve based on a difference between a temperature measured by the indoor temperature sensor and a previously input set temperature, and wherein the controller calculates a target evaporation pressure (Pf) of a refrigerant pressure that is heat exchanged in the indoor heat exchanger of the respective indoor unit, and adjusts the opening degree of the low pressure valve based on the target evaporation pressure.