| 摘要 |
PROBLEM TO BE SOLVED: To accurately measure the water level in a bathtub even when a water unstable phenomena occurs and forcibly remove trash stuck in a circulation device by a method wherein a supply pipe and a return pipe of a circulation circuit are changed over to each other by a flow path changeover device and the action of a flow detector is confirmed before and after the flow path changeover operation to detect the pressure. SOLUTION: A flow path changeover device 39 is provided at a position between a return pipe 26a and a supply pipe 26b of a circulation circuit and in the vicinity of a bathtub. For example, the flow path changeover device 39 incorporates a four-way valve where the flow path is changed between the supply and return pipes when a valve disc 39b in a valve body 39s is turned 90 deg.. Therefore, when the valve disc 39b in the valve body 39c of the flow path changeover device 39 is turned 90 deg., the flow path is changed over to the supply pipe 26a from the return pipe 26b and vice versa, and the inlet and the outlet of the circulating device mounted on the bathtub are substantially reversed. |
