| 摘要 |
PURPOSE:To prevent water from freezing and to improve operability by discharging remaining water in a hopper when an automatic operation switch is opened, and circulating the hot water in a bathtub to a circulation passage to purge the air in the passage. CONSTITUTION:A three-way valve 8 is switched to a hopper 5 side, and a pump 9 is operated to discharge remaining water in the hopper 5 to a circulation passage 7. When the facts that the float switches 51 of the hopper 5 are all OFF and the water is completely discharged are detected, the valve 8 is switched to the passage 7 side to circulate the hot water in a bathtub 6 for a predetermined period of time thereby to discharge the air sucked into the passage 7 into the bathtub 6. Even if an automatic operation switch 25 is opened to be stopped, the hot water does not remain in the hopper 5, and the passage 7 is set to the state that the water level of the bathtub 7 can be detected by a pressure sensor 12 by purging the air by the circulation of the hot water. Accordingly, when the switch 25 is closed, the water level can be initially detected, and the water level is not wastefully raised even if the hot water is already stored at the set water level or more in the bathtub 6. |
