| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent a risk of supply of high-temperature water exceeding a safe temperature to a hot water supplier (7) at valve opening of a solenoid valve (31) which is open all the time even if clogging progresses in a dust filter (39) for cooling water, in a unit provided with a mixed water passage (29) extended from a merging point between a hot water passage (14) provided with a dust filter (38) for hot water and a cooling water passage (15) provided with the dust filter (39) for cooling water, a water/hot water mixer (20) for temperature conditioning for adjusting mixing proportion of the cooling water against the hot water so that the temperature of mixed water flowing through the mixed water passage (29) is at a mixed target temperature, and a safety valve arranged in a bypass passage (28) connecting the cooling water passage (15) and the mixed water passage (29) and opened at safe operation. <P>SOLUTION: This mixing unit is provided with an actual mixing proportion determining means for determining an actual mixing proportion of the cooling water against the hot water actually mixed by the water/hot water mixer (20), and an upper limit opening of a hot-water volume adjusting valve (25) in temperature conditioning operation is lowered when the actual mixing proportion is smaller than a specified mixing proportion compared to the case where it is larger. <P>COPYRIGHT: (C)2003,JPO</p> |
