| 摘要 |
<p>PURPOSE:To simplify the title mechanism, and to minimize a space required therefor by supplying air to respective burners for hot-water supply and for additional heating by means of a single blower and a single supply air distributing member having a specified structure. CONSTITUTION:A vessel body 1 having an orthogonal hexahedron-like shape is provided with an air supply path P1 leading from an inlet side opening 2a opened on the side surface 'a' of the vessel body 1 to and outlet side opening 2b opened on the side surface 'b' thereof, and the side surface 'a' is provided with an air supply path P2 leanding from an inlet side opening 3a opened in a position adjacent to the inlet side opening 2a to an outlet side opening 3c opened on the side surface 'c' of the vessel body 1. The outlet port 4o of a blower 4, which is common to the air feed paths P1 and P2, is connected to the side surface 'a'. Further, air supply ports 5i and 6i leading to combustion chambers 5r and 6r of a burner 5 for hot-water feed and a burner 6 for additional heating are connected to the side surfaces 'b' and 'c', respectively. The ratios of the sectional areas of the inlet side openings 2a and 3a to those of the openings of the paths P1 and P2 are set beforehand in accordance with the respective amounts of air required for the burner 5 for hot water fed and the burner 6 for additional heating. The air blow quantity of the blower 4 can be adjusted correspondingly to the variation of the combustion amounts of the burners 5 and 6.</p> |
