Patent ID: 9103554
Filing Date: 2015-08-11
Classification: F24D,Y02B

Abstract:
1. A hot-water storage type heating unit, comprising: a hot-water storage tank which stores hot water in an inner portion thereof; a hot-water circulation circuit through which the hot water stored in the hot-water storage tank circulates; a radiation circuit to which a radiator is connected and in which a heating medium flows; a liquid-liquid heat exchanger which exchanges heat between the hot water which circulates through the hot-water circulation circuit and the heating medium which flows in the radiation circuit, and is disposed above the hot-water storage tank; a pump which is disposed in the hot-water circulation circuit on the downstream side of the liquid-liquid heat exchanger, and circulates the hot water in the hot-water circulation circuit; a gas-liquid separator which is provided so as to be interposed in the hot-water circulation circuit between the liquid-liquid heat exchanger and the pump; a return passage which communicates with the hot-water storage tank and the gas-liquid separator, and returns gas separated by the gas-liquid separator to the hot-water storage tank; an on-off valve which is provided in the return passage and opens and closes the return passage; and a controller controlling the on-off valve to close the return passage during operation of the pump, wherein said controller is an electronic control unit in communication with the pump and the on-off valve, and is configured to detect operation of the pump and, upon detecting operation of the pump, to control the on-off valve to close.