Air conditioner capable of performing dehumidification while maintaining a temperature of indoor air at a constant level

An air conditioner, comprising:

• an outdoor unit comprising a liquid pipe through which liquid refrigerant flows and a gas pipe through which gas refrigerant flows;
• a plurality of indoor units comprising a first indoor unit and a second indoor unit each connected to the liquid pipe and the gas pipe to circulate a refrigerant;
• a gas pipe connecting tube that connects the gas pipe and the plurality of indoor units;
• a first gas branch pipe that connects the first indoor unit and the gas pipe connecting tube;
• a second gas branch pipe that connects the second indoor unit and the gas pipe connecting tube;
• an indoor heat exchanger connecting pipe that connects the first indoor unit and the second indoor unit;
• and
• a liquid pipe connecting tube that connects the first indoor unit and the liquid pipe, wherein the first indoor unit comprises:
• a first indoor heat exchanger comprising a first heat exchanger configured to perform heat exchange between indoor air and a refrigerant, and a second heat exchanger configured to perform heat exchange between the indoor air and a refrigerant and arranged in a stacked fashion with the first heat exchanger;
• a first indoor fan configured to blow air to the first heat exchanger and the second heat exchanger;
• a first liquid branch pipe that connects the indoor heat exchanger connecting pipe and the first indoor heat exchanger;
• a first heat exchanger connecting pipe that connects the first liquid branch pipe and the first heat exchanger of the first indoor heat exchanger;
• a second heat exchanger connecting pipe that connects the first liquid branch pipe and the second heat exchanger of the first indoor heat exchanger;
• a first indoor expansion valve disposed at the second heat exchanger connecting pipe, wherein an opening amount of the first indoor expansion valve is opened selectively to expand a flowing refrigerant, wherein the liquid pipe connecting tube connects the first heat exchanger and the liquid pipe, and wherein the first gas branch pipe connects the second heat exchanger and the gas pipe;
• a first bypass pipe that connects the liquid pipe connecting tube and the indoor heat exchanger connecting pipe;
• a first bypass expansion valve disposed at the first bypass pipe, wherein an opening amount of the first bypass expansion valve is opened selectively to expand a flowing refrigerant;
• a second bypass pipe that connects the liquid pipe connecting tube and the second heat exchanger connecting pipe;
• and
• a second bypass expansion valve disposed at the second bypass pipe, wherein an opening amount of the second bypass expansion valve is opened selectively to expand a flowing refrigerant.