Patent ID: 6109534
Filing Date: 2000-08-29
Classification: B60H,F28F

Abstract:
A hot water-type heating device comprising:a heat exchanger for heating air by exchanging heat between hot water supplied from a hot water supply source and the air;a flow control valve for controlling a flow amount of the hot water supplied to the heat exchanger from the hot water supply source;a bypass circuit for allowing the hot water to flow therein while bypassing the heat exchanger; a pressure responsive valve for increasing an opening degree of the bypass circuit corresponding to a pressure rise of the hot water supplied from the hot water supply source;a bypass side hot water passage through which bypass side hot water discharged from the bypass circuit flows;a returning hot water passage through which returning hot water discharged from the heater exchanger flows; anda merging portion for merging the bypass side hot water passage with the returning hot water passage and for blocking flow of the returning hot water from the heat exchanger by fluid pressure of the bypass side hot water from the bypass circuit at the merging portion, whereinthe bypass side hot water and the returning hot water merge with each other at the merging portion and return to the hot water supply source; andthe returning hot water passage is always open regardless of an operation of the presure responsive valve.