Heating and hot water supply device

Abstract

In a heating and hot water supply device comprising a burning means, a first heat exchanger, a circulation passage for circulating a heating thermal medium, a circulation pump, a first bypass passage, a second heat exchanger for hot water supply, a hot water supply passage, a second bypass passage bypassing the second heat exchanger, and a control unit, a distribution means is provided at a first branching portion of the first bypass passage and is capable of adjusting its distribution ratio for heating, or hot water supply, or simultaneous heating/hot water supply, during heating operation, the hot water supply passage is closed by a flow rate adjustment means provided in the hot water supply passage.

1 . A heating and hot water supply device, comprising a combustion means, a main heat exchanger, a circulation passage connected to the main heat exchanger and to a heating apparatus, a circulation pump provided in the circulation passage, a first bypass passage that branches off from the circulation passage and bypasses the heating apparatus, a heat exchanger for hot water supply provided in the first bypass passage, and a hot water supply passage for supplying cold water to the heat exchanger for hot water supply, and for supplying hot water heated by the heat exchanger for hot water supply to a predetermined set hot water supply temperature, wherein:
 a distribution means is provided at a first branching portion of the first bypass passage, and a distribution ratio of the distribution means can be adjusted so that heating operation, or hot water supply operation, or simultaneous heating operation and hot water supply operation, become possible; and   a second bypass passage that bypasses the heat exchanger for hot water supply is provided in the hot water supply passage; a flow rate detection means is provided on an upstream side than a second branching portion of the second bypass passage; a flow rate adjustment means for the hot water supply passage is provided at the second branching portion or on the downstream side than the second branching portion and also at an upstream side than the heat exchanger for hot water supply; and, during heating operation, the hot water supply passage is closed by the flow rate adjustment means.   
     
     
         2 . The heating and hot water supply device according to  claim 1 , wherein the flow rate adjustment means is a distribution valve provided at the second branching portion. 
     
     
         3 . The heating and hot water supply device according to  claim 1 , wherein the flow rate adjustment means is a flow rate regulation valve provided more downstream than the second branching portion and moreover on the upstream side than the heat exchanger for hot water supply, and the bypass flow rate regulation valve is provided in the second bypass passage; and in that, during heating operation, the bypass flow rate regulation valve is opened.