| 摘要 |
PURPOSE:To enhance an accuracy of a set water level in a bathtub by excluding an error of a detected pressure by providing a temporary hot water supply route to a hot bath water temperature keeping return route through a three-way valve at a downstream side of a hot water supply pump. CONSTITUTION:When a pump 1 is operated in a state in which a three-way valve 2 of an upstream side selects a selecting port 2a and a three-way valve 3 of a downstream side selects a selecting port 3c, hot water of a hot water supply route 6 passes through a common port 2c from the port 2a of the valve 2, is boosted by the pump 1, and fed from a common port 2a to a temporary hot water supply route 11 through the port 3c. In this case, the route 11 is operated prior to pressure detection by a pressure sensor 12, and hot water is supplied to a bathtub 7 through a hot water temperature keeping return route 8, thereby urging residual bubble in a tube of the route 8. Thus, an error of a detected output of the sensor 12 is removed to enhance an accuracy of a set water level in the bathtub 7. |
