| 摘要 |
PURPOSE:To eliminate an influence of a circulation pump against a hydraulic pressure and enable the accurate termination of hot water feeding at a predetermined water level by a method wherein a timer means for prohibiting a water level sensing operation for a desired period of time just after an energization of the circulation pump is started and just after the operation of the circulation pump is stopped and means for storing a water level data before entering a prohibiting period are provided. CONSTITUTION:Water level data got from a water level sensing means 6 are normally stored in a water level data, memory means compared with a water level set value 10 and then a turned-on or turned-off condition of a hot water feeding valve 1 is controlled. A circulation pump for use of circulating water in a bath tub 5 is operated in response to a driving signal from a circulation pump controlling means 13. The circulation pump controlling means 13 may trigger a water level sensing prohibition timer means 14 just before the driving signal is inverted. The water level sensing prohibition timer means 14 starts to operate the timer with a signal from the circulation pump controlling means 13 and prohibits, during operation of the timer, the signal from being inputted into the water level data memory means 9 form the water level sensing means 6 and further being updated. |
