| 摘要 |
PURPOSE:To maintain an adequate water level without having influence of actions of a pump by controlling a water valve according to the detected signals of a water level sensor only when the pump is out of operation and an on-off valve is closed. CONSTITUTION:Hot-water filling control starts only when an on-off valve 24 is closed and a pump 23 is out of operation. A hot-water filling valve 18 is opened after the on-off valve 24 is closed, and after a specified time period passes, the water level is detected by a water level sensor 36 to continue hot-water filling. The on-off valve 24 is opened and the pump 23 operates at specified time intervals, and when the hot-water temperature in a bathtub B drops below a specified temperature, additional heating is carried out by a bath burner 5. At this time, the hot-water filling valve 18 is not opened and hot-water filling is not carried out even if a wrong hot-water filling instruction is issued because the on-off valve 24 is opened and the pump 23 is in operation. As the hot-water filling valve 18 is controlled only when the water level in the bathtub B is allowed to be accurately detected, the water level in the bathtub is accurately maintained. |
