Patent ID: 6868681

Claim:
An air conditioner comprising: an outdoor unit including a plurality of compressors for compressing a coolant, an outdoor heat exchanger connected to each of the compressors for condensing or evaporating the coolant as a condenser or an evaporator during cooling or heating a room of a house, and an expander connected to the outdoor heat exchanger for expanding the coolant; and an indoor unit including an indoor heat exchanger connected to the outdoor unit for evaporating or condensing the coolant as an evaporator or a condenser during cooling or heating the room of the house, the outdoor and indoor units together constituting a cooling cycle, wherein the outdoor unit comprises: a plurality of discharging pipes connected to the compressors for discharging the coolants compressed in the compressors, respectively; a connection pipe for gathering the coolants leaving the discharging pipes to guide the gathered coolants via the condenser, the expander, and the evaporator; a plurality of introducing pipes each branched off the end of the connection pipe for introducing the coolants into the compressors, respectively; and an oil separator disposed between the connection pipe and the introducing pipes for separating oil from the coolants discharged from the compressors, and wherein the air conditioner further comprises at least one auxiliary indoor unit including an indoor heat exchanger detachably attached to the outdoor unit.