| 摘要 |
PURPOSE:To enable a cheap and high accurate water level sensor device to be used by a method wherein when hot water is fed to a bath tub through a return pipe and a going pipe, an additional boiling three-way valve is intermittently changed over from the going pipe to the water level detector device during hot water feeding, a signal from the water level sensor is received to detect a water level of a bath tub and the hot water is fed to a set water level. CONSTITUTION:Opening or closing valve 11 is opened, hot water heated by a hot water feeder 7 passes through a hot water feeding three-way valve 22 and a pump 14 and flows in a going pipe 16, branches to a branch pipe 20a, an additional-heating three-way valve 20 and a return pipe 15 and then hot water is fed from an additional-heating circuit 17 to a bath tub 18 by the additional-boiling circuit 17 through the return pipe 15 and the going pipe 16. Then, the additional-boiling three-way valve 20 is intermittently operated under a control of a control device 23 and then the return pipe 15 and the water level sensor device 21 are communicated to each other. The water level sensor device 21 detects a water level in the bath tub 18 through the return pipe 15 and then the control device 23 receives its signal. In case that a water level in the bath tub 18 does not reach a set level, the additional-boiling three-way valve 21 is operated again to communicate the return pipe 15 with the going pipe 16 so as to feed hot water. That is, under operation of the additional-boiling three-way valve 20, the pump 14 and the water level detector device 21 are not always communicated with each other and a discharging pressure of the pump 14 is prevented from being applied directly to the water level detector 21. |
