AIR CONDITIONER

摘要

In an air-conditioning apparatus including a refrigerant circulating circuit A and a heat medium circulating circuit B that performs passing of heat to and from the refrigerant circulating circuit A, the heat medium circulating circuit is a closed circuit, the maximum pump head Pp of a pump 21 of the heat medium circulating circuit is 150 kPa or more, and a pressure near at least a suction side of the pump 21 is set to a charged pressure that is maintained equal to or higher than the atmospheric pressure during operation of the pump 21.