| 摘要 |
PURPOSE:To reduce the time necessary for hot water feeding to correctly detect the water level in a bathtub by repeating open and close cycles of many times consisting of a first period in which an on-off solenoid valve is opened to perform hot water feeding from a hot water supply device to the bathtub and a second period in which the valve is closed and detecting the water level in the bathtub in the second period by the use of a pressure sensor. CONSTITUTION:Hot water feeding from a hot water supply device 30 to a bathtub 10 is performed through a supply pipe 23, a return pipe 22 and a bypass pipe 50 in a first period in which a solenoid valve 51 is opened and executed through the supply pipe alone in a second period in which the solenoid valve 51 is closed. Accordingly, pipe line resistance from a pump 24 to the bathtub 10 is large in the second period, but in the first period the pipe line resistance is small enough to parallelly connect the supply pipe 22 and the bypass pipe 50 and the average flow of the hot water increases. The open and close cycles of the solenoid valve 51 are repeated through approximately the whole period of the hot water supply and the detection of the water level of the bathtub 10 is conducted by a pressure sensor 52 in the second period. |
