| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology capable of easily draining water from a hot water filling control device.SOLUTION: Check valves 104, 105 that are opened when pressure of hot water on a water heater side reaches predetermined pressure or higher are arranged in a hot water supply passage for connecting the water heater with a bathtub. A filter 101 for removing foreign matters is installed on the water heater side of the check valves. An atmosphere release valve 106 that is opened when pressure of clean water supplied to the water heater decreases is connected to the bathtub side of the check valves. A heater 107 is disposed between the check valves and the filter, and when water is drained, a temperature of hot water between the check valves and the filter is increased. Due to this configuration, when the hot water is heated and expanded, the pressure between the check valves and the filter increases, and when the pressure exceeds predetermined pressure, the check valves open. Then, this enables inflow of air, so that the atmospheric pressure is applied to the hot water from the check valve side. In this state, since the weight of the hot water cannot be supported only by the surface tension of water generated in the filter, the hot water is discharged through the filter.SELECTED DRAWING: Figure 7 |
