| 摘要 |
PURPOSE:To maintain a bathtub water level under stabilized state constantly by allowing a first comparison means to start an air purge start signal when the water level reaches a first set value after having started hot water fill up operation and continuously filling up the bathtub until a pressure sensor detects a second set value after air purge. CONSTITUTION:When a first set value H1 is detected, this device judges that the water level in a bathtub has reached a predetermined water level L and compares with a second set value H2. When this device fails to detect a specified value, this device judges that air is present in a return pipe 9, which forces a pressure sensor carry out a wrong detection and allows the operation return to filling up from a forward pipe 8. In this manner, air purge F5 is carried out every time when the pressure sensor 11 detects a specified value. When the sensor fails to detect the first set value H1, the operation returns to filling up F3 from the forward pipe 8. When it is confirmed that hot water is filled up to the first set value H1, the filling up continues up to the second set value H2 whose water level is higher than the first set value H1. When a detection value HB becomes larger than H2, a fill up valve 6 is closed and the fill up operation comes to a halt. |
