| 摘要 |
PROBLEM TO BE SOLVED: To prevent high temperature hot water from being discharged even in a hot water supply cock being opened when a bypass control valve provided on the side of water inflow of a hot water supply circuit for mixing water is in the failure. SOLUTION: There is provided control means for prohibiting heating combustion in the arrangement of a bypass control valve 8 controlled to a 'full open' position upon heating operation, when a 'full open' position signal of the bypass control valve 8 is not detected. Consequently, the heating for a hot water supply heat exchanger 7 is eliminated, and hence even in the failure of the bypass control valve 8 high temperature hot water from a hot water supply cock 1 is prevented from being discharged. |
