PROBLEM TO BE SOLVED: To prevent hot water from a heat exchanger for mist immediately after heating sterilization from being sprayed inside a bathroom after performing hot water return temperature monitoring control at the start of a water mist operation, and to eliminate water discharge without the need of residual water discharging operation.SOLUTION: The mist spraying system 3 for performing the hot water return temperature monitoring control for heating sterilization of the heat exchanger 11 for mist includes blowing means for sucking air inside the bathroom 13 from the air suction port 33 of an apparatus casing 25 and blowing off the air from an air blow-off port 30 and a cooling water supply pipe line 20c to be cooled by the air inside the bathroom 13 when the blowing means is driven. After performing the hot water return temperature monitoring control at the start of the operation of the mist spraying system 3, in the state of stopping hot water supply to the heat exchanger 11 for the mist and driving the blowing means, a water mist operation of spraying non-heated water for the mist from the heat exchanger 11 for the mist from a mist nozzle 10 through the cooling water supply pipe line 20c is performed.COPYRIGHT: (C)2012,JPO&INPIT【課題】水ミスト運転開始時に温水戻り温度監視制御を実行した後に、加熱殺菌直後のミスト用熱交換器からの温水が浴室内に噴霧されるのを防止すると共に、残水の排水操作が不要な排水レス仕様にする。【解決手段】ミスト用熱交換器11の加熱殺菌用の温水戻り温度監視制御を実行するミスト噴霧装置3において、機器ケーシング25の空気吸込口33から浴室13内の空気を吸い込み、空気吹出口30から空気を吹き出す送風手段と、送風手段の駆動時に浴室13内の空気により冷却される冷却用給水管路20cとを設け、ミスト噴霧装置3の運転開始時に温水戻り温度監視制御を実行した後で、ミスト用熱交換器11への温水供給を停止し且つ送風手段を駆動した状態で、ミスト用熱交換器11からの非加熱のミスト用水を冷却用給水管路20cを経由してミストノズル10から噴霧させる水ミスト運転を実行する。【選択図】図1
