| 摘要 |
PROBLEM TO BE SOLVED: To provide a drain unit for a hot-water pouring circuit, capable of surely draining the pouring circuit which contains remaining water, to a water heating circuit side. SOLUTION: Hot water is poured from the water-heating circuit 2 in a reheating circulating circuit 3 of a bathtub water, through the hot water pouring circuit 5, to enable hot water to be filled in a bathtub 4 by a double-conveying type. As the pouring circuit, a first hot water pouring duct 53 is made to branch at the downstream side position of a hot water flow rate sensor 52, with a filter 52a being inserted into a hot water pouring duct 51 via a first hot water pouring solenoid valve 55, to communicate with a supply duct 34 at its downstream end. A second hot-water pouring duct 54 is extended to the downstream side position, passed the valve 55 via a second hot-water pouring solenoid valve 57 to communicate with a return duct 33 at its downstream end. The duct 51 communicates with a duct part 51a between the first hot water pouring solenoid part and a second hot-water pouring solenoid valve at one end and communicates with a branched part vicinity position to a hot-water output duct 13 of the hot-water pouring duct at the other end. When a draining plug 15a, attached to a hot-water pouring fitting 15 of the downstream end of the hot water pouring duct, is opened, the air introduced into the plug is introduced from the other end side of a connecting duct to the duct part. Thus, the remaining water of the duct part is discharged from the plug through the pouring duct.
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