Patent ID: 8713951

Claim:
An air conditioning apparatus comprising: a plurality of use-side heat exchangers; a heating inter-heat-medium heat exchanger and a cooling inter-heat-medium heat exchanger that exchange heat between a heat medium circulated in a heat medium circulating circuit including at least one of the use-side heat exchangers and a heat source fluid fed from a heat source unit to respectively heat and cool the heat medium; a heat medium feeding unit corresponding to each of the inter-heat-medium heat exchangers; outside air temperature detecting means for detecting outside air temperature; and a controller that controls the flow path of the heat medium, the air conditioning apparatus configured to simultaneously operate cooling and heating in which each of the use-side heat exchangers connects to either the heating inter-heat-medium heat exchanger or the cooling inter-heat-medium heat exchanger and in which the heating inter-heat-medium heat exchanger and the cooling inter-heat-medium heat exchanger operate simultaneously, wherein: the controller compares the outside air temperature detected by the outside air temperature detecting means with a predetermined temperature at a preset time, preheats part of the plurality of use-side heat exchangers by driving the heat medium feeding unit connected to the heat medium circulating circuit corresponding with the part thereof to perform heat-up operation of the heat medium for the part of the plurality of use-side heat exchangers when the outside air temperature is lower than the first predetermined temperature, and selects the use-side heat exchangers to be preheated out of all the use-side heat exchangers in descending order of length of a heat medium pipe between each of the use-side heat exchangers and a unit including the heating inter-heat-medium heat exchanger.