| 摘要 |
PURPOSE:To make it possible to carry out rapidly automatic hot-water supply to a desired water level by measuring the dynamic pressure of a pump and storing it in the control unit of a microcomputer and controlling thereby the hot-water supply for the next time. CONSTITUTION:As soon as hot water supply is started, the pressure measurement by a pressure sensor 10 and the water volume measurement by a water volume sensor 4 are carried out. Values of detection by the pressure sensor 10 is substantially constant until the water level reaches a circulation fixture 14a because there is only the dynamic pressure of the pump while the water level of a bath tub is below the circulation fixture 14a. But when the water level in the bath tub comes above the circulation fixture 14a, the detected value of the pressure sensor 10 rises because the dynamic pressure of the pump and the head pressure due to the water positioned above the circulation fixture are added. The time point at which the detected value of the pressure sensor starts climbing from the substantially constant pressure is detected as a reference time, and the hot-water supply is continued to the bath tub as the output of the pressure sensor is kept to be detected until the time from the reference time to the time when the water level reaches a desired water level set in a controller. When the pressure sensor detects the desired water level, solenoid valves 5 and 6 are closed and at the same time the pump 8 is closed. |
