PROBLEM TO BE SOLVED: To prevent opening of a mist valve from being prohibited because the pressure of water enclosed between a water supply valve and the mist valve excessively rises when the water supply valve is closed after a check on leak with the rise of water temperature during the preheating operation before the start of the next mist operation in a mist sauna device, which sprays hot water from a mist nozzle by heating water to be fed to the mist nozzle 16 by a heating medium circulating in a mist heating medium circulating pathway 19 in a liquid-liquid heat exchanger 18, and for which the check on leak for determining presence of leak within the liquid-liquid heat exchanger is executed based on the change in temperature detected by a heat medium temperature sensor 15 after opening the water supply valve 21 by temporarily opening the water supply valve 21 after closing the mist valve 23 and the water supply valve 21 and terminating the mist operation.SOLUTION: If the temperature detected by a mist temperature sensor 24 is lower than a prescribed reference temperature when a command to terminate the mist operation is output, execution of the check on leak is prohibited and the water supply valve 21 is closed ahead of the mist valve 23.COPYRIGHT: (C)2011,JPO&INPIT【課題】ミストノズル16に供給する水を液々熱交換器18においてミスト用熱媒循環路19に循環させる熱媒体により加熱し、ミストノズルから温水を噴霧させるミストサウナ装置であって、ミスト弁23と給水弁21とを閉弁してミスト運転を終了した後に、給水弁21を一旦開弁させて、給水弁21の開弁後の熱媒温度センサ15の検出温度の変化に基づいて液々熱交換器内のリーク発生の有無を判定するリーク検査を行うものにおいて、リーク検査後の給水弁の閉弁で給水弁とミスト弁との間に封じ込められた水の水圧が次のミスト運転開始前の予熱運転中の水温上昇で過度に昇圧し、ミスト弁が開弁不能になることを防止する。【解決手段】ミスト運転の終了指令が出されたときに、ミスト温度センサ24の検出温度が所定の基準温度未満の場合は、リーク検査を禁止し、給水弁21をミスト弁23に先行して閉弁させる。【選択図】図1
