AIR CONDITIONING DEVICE

摘要

A safe, highly reliable, and energy saving air conditioning device. An air conditioning device provided with: an indoor unit (2) having utilization heat exchangers (26) for performing heat exchange between heat media and air which is subjected to the heat exchange; a heat medium converter (3) having inter-heat medium heat exchangers (15) for heating or cooling the heat media, pumps (21) each feeding a heat medium, which engages in the heating or cooling by an inter-heat medium heat exchanger (15), to each flow path to circulate the heat medium in the flow path, and heat medium flow path switching devices (22, 23) for performing switching operation for causing the heat medium from a selected flow path to flow into and out of each utilization heat exchanger (26); an expansion tank (60) connected to any one of the flow paths and relaxing a pressure change caused by a change in the volume of the heat medium; and pressure equalizing piping (5c) for connecting with each other the inlet side flow path of a heat medium feeding device of each flow path or connecting with each other the outlet side flow path of the heat medium feeding device of each flow path.