Patent ID: 9719691
Date: 2017-08-01
CPC Classifications: F24F,F25B,Y02B

Claim:
1. An air-conditioning apparatus comprising: a heat source unit including a compressor, a first flow passage switching valve that switches a flow passage of a first refrigerant, wherein the heat source unit also includes a heat-source-side heat exchanger; a plurality of indoor units each including a use-side heat exchanger; a relay unit including a plurality of intermediate heat exchangers each of which is operable in either a condenser mode or an evaporator mode, second flow passage switching valves that switch operation of the indoor units between heating and cooling, and third flow passage switching valves that switch connection of the intermediate heat exchangers between the condenser mode and the evaporator mode, the air-conditioning apparatus including a primary-side cycle through which a primary-side heat transfer medium circulates between the heat source unit and the relay unit, and a secondary-side cycle through which a secondary-side heat transfer medium circulates between the relay unit and the indoor units, wherein heat exchange is performed between the primary-side cycle and the secondary-side cycle in the intermediate heat exchangers, wherein when all of operating indoor units out of the plurality of indoor units are performing a cooling operation, the third flow passage switching valves are controlled such that the number of the intermediate heat exchangers operating as evaporators is greater than in a cooling main operation in which, out of said plurality of indoor units, an indoor unit performing cooling and an indoor unit performing heating exist at the same time and the first flow passage switching valve is controlled so that the heat-source-side heat exchanger operates by being connected to a discharge side of the compressor; and control means for controlling a frequency of the compressor and a capacity of the heat-source-side heat exchanger such that, during the cooling main operation, a target value for a suction pressure or an evaporating temperature at the compressor is set lower than the target value for the suction pressure or the evaporating temperature at the compressor in a case where all of the operating indoor units are performing the cooling operation.