| 摘要 |
PURPOSE:To reduce the amount of hot water effluent from an air discharge outlet of a back-flow prevention device by interrupting hot water supply control when a flow rate detected by flow rate detector means is less than a predetermined valve over a predetermined time during the hot water supply control. CONSTITUTION:In automated hot water supply control, it is judged whether or not a water level in a bathtub B reaches a level set by remote control when hot water is decided to be existent, and when the set water level is not reached one-way carrying operation is performed on the basis of a water level detected by a water level sensor 35 provided on an opposite direction pipe line 30b. Provided the changeover valve 33 is not closed, the same valve 33 is closed, while provided it is closed, it is judged whether or not the opening/closing valve 28 is opened. Provided the valve 28 is closed, the same valve 28 is opened, while provided it is opened, a hot water amount servo 16 is closed to limit the flow rate when a hot water supply valve 19 is opened, and thereafter the same valve 19 is opened. In the case the detected flow rate does not reach a reference one, it is judged whether or not the flow rate not reaching the reference one continues for a predetermined time, and provided the flow rate does not reach the reference one for the predetermined time, the hot water supply is interrupted and the hot water supply valve 19 is closed. |
