| 摘要 |
PURPOSE:To facilitate construction and to widen a set adjustment range by detecting the water level in a bathtub by a pressure sensor outside the bath room. CONSTITUTION:When automatic hot-water supply is commanded, a solenoid valve 17 for automatic hot-water supply and a solenoid valve 22 are opened, a pump 7 is started, and a solenoid valve 8 is opened. Hot water supplied form the hot-water supply circuit B consisting of an inhalant siphon 13, a heat exchanger 2 for hot-water supply, a hopper 16, etc., reaches the bathtub 4 through a by-pass pipe 10 and a return pipe 6 and the path from the pressure sensor 9 to the bathtub 4 is purged with air. The valve 8 is closed a constant time later and the hot water flows in the bathtub 4 from an onward pipe 5; and a comparator is powered no to compare the output value of the sensor 9 based upon the water level i the bathtub with a partial pressure value set with a bathtub water level variation switch 27 by using the pipes 6 and 10 as pressure-detected pipes. When the both coincides with each other, the hot water supply is stopped with a signal from the comparator.
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