| 摘要 |
PURPOSE:To prevent a post-boiling phenomenon in the case where a water flow switch is actuated in a short time by providing the hot water feeder with a heat exchanger, a gas burner for heating it, a fan for exhausting exhaust gas, a water flow switch for detecting water feed for the heat exchanger and a control circuit for performing sequence control for hot water supply. CONSTITUTION:When control circuit 17 stops flowing-out hot water, a water flow switch 8 stop actuation to detect it and electromagnetic closing valves 11, 12 are closed to stop burning of a gas burner 4, but an exhaust fan 5 is continued to rotate for a prescribed time and a post-purge is performed. On the other hand, in the case where the water flow switch 8 is actuated in the post-purge, after according to the normal sequence operation a lighter is actuated to perform ignition operation, an operation state of the water flow switch 8 is detected, if this is turned off, it is judged as temporary operation of the water flow switch 8 due to the closing, opening and the like of the other faucets and the ignition operation is ended, but it is continued if a post-purge time does not end. Therefore, the post-boiling by the suspension of the post-purge can be prevented surely. |
