Patent ID: 7946121

Claim:
An air conditioner comprising: a refrigerant circuit divided into a plurality of portions, the refrigerant circuit being configured to interconnect a compressor, a heat source side heat exchanger, and a utilization side heat exchanger; a refrigerant quantity calculating section configured to use a relational expression between the refrigerant quantity in each portion of the refrigerant circuit and an operation state quantity of constituent equipment or refrigerant flowing in the refrigerant circuit in order to calculate the refrigerant quantity in each of the portions from the operation state quantity of constituent equipment or refrigerant flowing in the refrigerant circuit; and a refrigerant quantity judging section configured to use the refrigerant quantity in each of the portions calculated by the refrigerant quantity calculating section in order to judge the adequacy of the refrigerant quantity in the refrigerant circuit, the refrigerant circuit including a refrigerant communication pipe that interconnects a heat source unit and a utilization unit, the heat source unit including the compressor and the heat source side heat exchanger, and the utilization unit including the utilization side heat exchanger, and the relational expressions being separately set for the refrigerant communication pipe and a portion other than the refrigerant communication pipe, and the refrigerant circuit being divided into these portions.