| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat source device which suppresses heat radiation of a circulation liquid in a secondary heat exchanger during a heating operation.SOLUTION: The heat source device comprises: a burner 4; a primary heat exchanger 6 which heats the circulation liquid flowing in a primary flow channel 5; a secondary heat exchanger 8 which heats the circulation liquid flowing in a secondary flow channel 7; a terminal 18; a circulation pump 25; and a control part 32 by which, during a circulating operation in which the circulation pump 25 is driven and the circulation liquid returned from the terminal 18 is made to flow from the secondary flow channel 7 to the primary flow channel 5 and circulated to the terminal 18 again, a temperature of the circulation liquid is controlled to a preset temperature by executing or stopping combustion of the burner 4. The heat source device also comprises: a bypass flow channel 22 for guiding the circulation liquid to the primary flow channel 5 while bypassing the secondary flow channel 7; and flow channel switching means 23 for switching between an ordinary state in which the circulation liquid is returned to a side of the secondary flow channel 7 and a bypass state in which the circulation liquid is returned to a side of the bypass flow channel 22. While the combustion of the burner 4 is executed during the circulating operation, the control part 32 controls the flow channel switching means 23 into the ordinary state and when the combustion of the burner 4 is stopped during the circulating operation, the control part sets the flow channel switching means 23 into the bypass state.SELECTED DRAWING: Figure 1 |
