JP3701595B2

JP3701595B2 - Bathroom heating system

Info

Publication number: JP3701595B2
Application number: JP2001297636A
Authority: JP
Inventors: 圭二加藤; 佳幹可児
Original assignee: Rinnai Corp
Current assignee: Rinnai Corp
Priority date: 2001-09-27
Filing date: 2001-09-27
Publication date: 2005-09-28
Anticipated expiration: 2021-09-27
Also published as: JP2003106547A

Description

【０００１】
【発明の属する技術分野】
本発明は、温水を熱源として浴室を暖房する浴室暖房装置に関する。
【０００２】
【従来の技術】
従来より、熱源として所定温度の温水が供給される温水式の熱交換器を備え、該熱交換器により加熱された空気を温風として浴室内に送風して浴室の暖房を行う浴室暖房装置が知られている。かかる浴室暖房装置においては、暖房運転の開始後、浴室内の温度が温度設定スイッチ等により設定された目標温度に保たれるように、温調制御が行なわれていた。
【０００３】
そして、浴室内の温度を検出する浴室温度センサは、浴室内の空気を前記熱交換器を経由して循環させる循環ファンにより浴室内の空気が吸入される経路に設けられるのが一般的であるが、この場合には、該浴室温度センサにより浴室内の温度を検出するためにはある程度以上の回転数で送風ファンを回転させて浴室内の空気を十分に循環させ、浴室内の空気を浴室温度センサまで導入可能な風量を生じさせる必要がある。
【０００４】
そのため、浴室温度センサにより浴室内の温度を検出しながら暖房運転を行なう場合、暖房運転中は、送風ファンの回転数を、浴室内の空気が十分に循環されて、浴室内の空気を浴室温度センサまで導入するのに必要な風量を生じさせる下限回転数以上に保つことが要求される。
【０００５】
ところが、浴室暖房装置の暖房能力に対して浴室が狭い場合や、目標温度と外気温との差が小さいときには、送風ファンの回転数を前記下限回転数まで低下させても浴室内の温度が目標温度を超えてしまい、浴室内の温度を目標温度に保つことができない場合がある。そこで、かかる場合には、送風ファンを前記下限回転数よりも低い回転数で所定時間回転させることによって、浴室内の温度上昇を抑制することが考えられる。
【０００６】
しかし、本願発明者らは、このように、送風ファンを前記下限回転数よりも低い回転数で所定時間回転させた場合、該所定時間内は浴室温度センサにより浴室内の温度を精度良く検知することができないことから、種々の不都合が生じ得ることを知見した。
【０００７】
【発明が解決しようとする課題】
本発明は上記背景を鑑みてなされたものであり、暖房運転の実行時に、浴室内の温度の検出が可能な風量を生じさせる下限回転数よりも低い回転数で送風ファンを所定時間回転させて浴室内の温度上昇を抑制したとき生じ得る不都合の発生を防止した浴室暖房装置を提供することを目的とする。
【０００８】
【課題を解決するための手段】
本発明は上記目的を達成するためになされたものであり、所定温度で供給される温水を熱源とする熱交換器と、空気を吸引して該熱交換器を通過させると共に該熱交換器を通過した空気を浴室内に送風するファンと、該ファンにより吸引される空気の流入経路中に設けられた浴室温度センサと、前記熱交換器に温水が供給された状態で前記ファンを作動させることにより前記熱交換器を通過して加熱された空気を浴室内に送風し、前記浴室温度センサの検出温度が所定の目標温度と一致するように前記ファンの回転数を制御する暖房運転を実行する暖房制御手段とを備え、前記暖房制御手段は、前記暖房運転の実行時に、前記ファンの回転数を前記浴室温度センサにより浴室内の温度を検出することができる風量を生じさせる下限回転数まで低下させても前記浴室温度センサの検出温度が前記目標温度を超えるときは、前記ファンを前記下限回転数よりも低く設定した低速回転数で所定時間作動させる浴室暖房装置の改良に関する。
【０００９】
そして、本発明の第１の態様は、前記目標温度を設定する目標温度設定手段を備えた場合に生じる不都合を解消することを目的としている。すなわち、前記ファンが前記下限回転数よりも低く設定した前記低速回転数で回転している前記所定時間内に、前記目標温度設定手段により前記目標温度を上げる変更がなされたときに、前記所定時間が経過するまでの間、前記ファンの回転数を前記低速回転数に維持すると、前記目標温度を上げたにも拘わらず前記所定時間が経過するまでの間は浴室暖房装置から供給される熱量が増加しないため、浴室内の温度が上がり始めるまでに時間遅れを生じ、入浴者に違和感を与えてしまうという不都合がある。
【００１０】
そこで、本発明の第１の態様は、前記目標温度を設定する目標温度設定手段を備え、前記暖房制御手段は、前記所定時間内に前記目標温度設定手段により前記目標温度を上げる変更がなされたときに、前記浴室温度センサの検出温度が前記目標温度以上となるまで、前記ファンを前記下限回転数以上の回転数で作動させることを特徴とする。
【００１１】
かかる本発明によれば、前記所定時間内に前記目標温度設定手段により前記目標温度を上げる変更がなされると、前記暖房制御手段は、前記浴室温度センサの検出温度が前記目標温度以上となるまで、前記ファンを前記下限回転数以上の回転数で回転させる。そのため、前記目標温度を上げる変更に応じて、遅れ時間を生じることなく前記浴室暖房装置から浴室内に供給される熱量が増加し、浴室内の温度を速やかに変更後の目標温度まで上昇させることができる。
【００１２】
また、本発明の第２の態様は、前記ファンの回転数の制御範囲を設定する回転数範囲設定手段を備えた場合に生じる不都合を解消することを目的としている。すなわち、前記ファンが前記下限回転数よりも低く設定した前記低速回転数で回転している前記所定時間内に、前記回転数範囲設定手段により前記ファンの回転数の範囲を高回転域に移行する変更がなされると、前記所定時間が経過するまでの間は、前記ファンの回転数の制御範囲を高回転域に移行したにも拘わらず、前記所定時間が経過するまでの間は前記ファンの回転数が前記低速回転数に維持されるため、前記ファンの回転数が上昇し始めるまでに時間遅れが生じ、入浴者に違和感を与えてしまうという不都合がある。
【００１３】
そこで、本発明の第２の態様は、前記暖房運転における前記ファンの回転数の制御範囲を設定する回転数範囲設定手段を備え、前記暖房制御手段は、前記所定時間内に前記回転数範囲設定手段により前記ファンの回転数の制御範囲を高回転方向に移行する変更がなされたときに、前記浴室温度センサの検出温度が前記目標温度以上となるまで、前記ファンを前記下限回転数以上の回転数で作動させることを特徴とする。
【００１４】
かかる本発明によれば、前記所定時間内に前記回転数範囲設定手段により前記ファンの回転数の制御範囲を高回転方向に移行する変更がなされると、前記暖房制御手段は、前記浴室温度センサの検出温度が前記目標温度以上となるまで、前記ファンを前記下限回転数以上の回転数で回転させる。そのため、前記ファンの回転数の制御範囲を高回転方向に上げる変更に応じて、遅れ時間を生じることなく前記ファンの回転数を速やかに上昇させることができる。
【００１５】
また、本発明の第３の態様は、前記ファンが前記下限回転数よりも低く設定した前記低速回転数で回転している前記所定時間内に、浴室内の温度が急激に低下した場合に生じる不都合を解消することを目的としている。すなわち、前記所定時間内に、例えば、入浴者が換気のために浴室の窓を開けると、浴室内に外気が流入して浴室内の温度が急激に低下する。そして、この場合、前記所定時間が経過するまでは前記ファンの回転数が前記低速回転数に維持されるため、低下した浴室内の温度が上がり難く、浴室内の温度が低下した状態のままとなって入浴者が寒さを感じてしまうという不都合がある。
【００１６】
そこで、本発明の第３の態様は、前記暖房制御手段は、前記所定時間内に前記浴室温度センサの検出温度が前記目標温度から所定温度幅以上低下したことを把握したときに、前記浴室温度センサの検出温度が前記目標温度以上となるまで、前記ファンを前記下限回転数以上の回転数で作動させることを特徴とする。
【００１７】
かかる本発明によれば、前記所定時間内に前記浴室温度センサの検出温度が前記目標温度から前記所定温度幅以上低下すると、前記暖房制御手段は、前記浴室温度センサの検出温度が前記目標温度以上となるまで、前記ファンを前記下限回転数以上の回転数で作動させる。そのため、浴室内の温度が急激に低下したときに、前記ファンの回転数が上昇し、浴室内の温度を前記目標温度まで速やかに復帰させることができる。
【００１８】
【発明の実施の形態】
本発明の実施の形態の一例について、図１〜図５を参照して説明する。図１は本発明の浴室暖房装置の設置状態を示した図、図２は図１に示した浴室暖房装置の全体構成図、図３は暖房運転時における循環ファンの速数切換えと浴室内の温度の推移を示したグラフ、図４及び図５は暖房運転の実行フローチャートである。
【００１９】
図１を参照して、浴室暖房装置１は浴槽２が備えられた浴室３の天井部分に設置され、商用電源のコンセント４からブレーカ５を介して供給される電力により作動する。また、浴室暖房装置１は熱源機６と熱源機ケーブル７により通信可能に接続され、熱源機６から浴室暖房機１に給湯往き管８ａを介して所定温度の温水が供給され、該温水は給湯戻り管８ｂを介して熱源機６に戻る。
【００２０】
さらに、浴室暖房装置１には、浴室３を換気するための中間ダクト９が連通し、また、リモコンケーブル１０を介して運転モードの設定等を行うためのリモコン１１（本発明の目標温度設定手段及び回転数範囲設定手段の機能を含む）が接続されている。
【００２１】
次に、図２を参照して、浴室暖房装置１は、浴室暖房装置１の全体的な作動を制御するコントローラ２０（本発明の暖房制御手段の機能を含む）、給湯往き管８ａを介して供給される温水を熱源として空気を加熱する熱交換器２１、給湯往き管８ａを開閉する熱動弁２２、吸気口２３から吸入した空気を熱交換器２１で加熱して浴室内に温風として送出する循環ファン２４（本発明のファンに相当する）、循環ファン２４を作動させるファンモータ２５、送出される空気の向きを設定するためのルーパー２６、ルーパー２６を作動させるルーパーモータ２７、熱源機６から供給される温水の温度を検出する温水サーミスタ２８、吸気口２３から吸入される浴室内の空気の温度（＝浴室の温度）を検出する室温サーミスタ２９（本発明の浴室温度センサに相当する）、漏電ブレーカ３０、リモコン用コネクタ３１、熱源機用コネクタ３２、電源用コネクタ３３、及び中間ダクトファン用コネクタ３４を備える。
【００２２】
また、中間ダクト９の途中箇所には中間ダクトファン４０が設置され、コントローラ２０は、中間ダクトファン用コネクタ３４と中間ダクトファンケーブル４１を介して中間ダクトファン４０に制御信号を送信することにより、中間ダクトファン４０の作動／停止を制御する。
【００２３】
コントローラ２０は、リモコン１１に備えられた運転モード切替スイッチ（図示しない）の操作に応じて、以下の表１に示した「暖房」、「涼風」、「乾燥」、「換気」、及び「凍結防止」の各運転モードで浴室暖房装置１を作動させる。
【００２４】
【表１】

【００２５】
また、リモコン１１には、循環ファン２４の風量の制御範囲（本発明の回転数の制御範囲に相当する）を「強」、「弱」、「微」の３段階で設定するための風量切替スイッチ（図示しない、本発明の回転数範囲設定手段に相当する）と、暖房モードにおける目標温度を「高」、「中」、「低」の３段階で設定するための温度切替スイッチ（図示しない、本発明の目標温度設定手段に相当する）が備えられている。
【００２６】
そして、コントローラ２０は、該風量切替スイッチと該温度切替スイッチの操作に応じて、以下の表２に示したように、暖房モードにおいて切換える循環ファン２４の回転数を１速〜６速の６段階で設定する。なお、速数の数字が大きくなるほど循環ファン２４の回転数が高く設定されている。
【００２７】
【表２】

【００２８】
そして、上記表２に示したように、暖房モードにおいては、コントローラ２０は暖房０〜暖房３という４種類のサイクルで循環ファン２４の速数を切換え、各サイクル（暖房０〜暖房３）における風量が上記表２に基づいて設定される。
【００２９】
ここで、室温サーミスタ２９は、循環ファン２４により吸気口２３から吸入される浴室内の空気の流入経路中に設けられており、循環ファン２４の回転数が低いと、浴室内の空気の循環が不十分となって、実際の浴室内の温度と室温サーミスタ２９の検出温度との間で差が生じ、室温を精度良く検知することができなくなる。
【００３０】
そして、本実施の形態では、４速〜６速が、実際の浴室内の温度と室温サーミスタ２９の検出温度とがほぼ一致して、浴室内の温度を精度良く検知することができる風量が確保できる下限回転数よりも高い回転数に設定されている。そのため、コントローラ２０は、基本的には、循環ファン２４が４速以上で回転しているときに、室温サーミスタ２９により浴室内の温度を検知する。
【００３１】
暖房モードにおいて、コントローラ２０は、浴室内の温度を室温サーミスタ２９で検出し、浴室内の温度がリモコン１１で設定される「高」、「中」、「低」に対応して予め設定された目標温度に保たれるように、循環ファン２４の速数を切換える暖房運転を行う。以下、暖房運転におけるコントローラ２０の作動について説明する。
【００３２】
使用者がリモコン１１に備えられた運転モード切替スイッチ（図示しない）を「暖房」に設定して、運転スイッチ（図示しない）をＯＮ操作すると、コントローラ２０は、熱動弁２２を開弁すると共に、熱源機ケーブル７を介して作動開始を指示する制御信号を熱源機６に送信する。
【００３３】
これにより、熱源機６が作動し、給湯往き管８ａを介して熱源機６から熱交換器２１に所定温度（例えば８０℃）の温水の供給が開始される。そして、コントローラ２０は、浴室内に冷風が供給されることを防止するため、温水サーミスタ２８の検出温度が所定レベル以上（例えば４０℃以上）となるのを待って、循環ファン２４を作動させて浴室への温風の送出を開始する。
【００３４】
図３は、風量が「強」で温度が「高」に設定されて暖房運転が開始されたときの循環ファン２４の速数と室温の推移を示したグラフであり、横軸が時間（ｔ）、縦軸が上から循環ファン２４の速数（１速〜６速）、熱動弁２２のＯＮ／ＯＦＦ、浴室内の温度に設定されている。図３を参照して、暖房運転の指示がなされた時刻ｔ₀で、コントローラ２０は、上述したように熱動弁２２を開弁して熱源機６を作動させる。
【００３５】
そして、温水サーミスタ２８の検出温度が所定レベル以上となった時刻ｔ₁で、循環ファン２４の回転を開始し、室温サーミスタ２９の検出温度が目標温度（Ｔａに達するまで、循環ファン２４を６速で回転させる「暖房２サイクル」を実行する。
【００３６】
次に、コントローラ２０は、室温サーミスタ２９の検出温度が目標温度（Ｔａ）以上となった時刻ｔ₂から、循環ファン２４を４速で時間Ｔ1の間だけ回転させる「暖房３サイクル」を実行し、「暖房３サイクル」が終了した時刻ｔ₃で、室温サーミスタ２９の検出温度を目標温度（Ｔａ）と比較する。このように、循環ファン２４の回転数を段階的に下げて温風の送出風量が急速に減少することを抑制することによって、コントローラ２０は、隙間風や壁面からの冷輻射により入浴者が寒さを感じることを軽減している。
【００３７】
図３のグラフでは、時刻ｔ₃で室温サーミスタ２９の検出温度が目標温度（Ｔａ）を超えている。これは、循環ファン２４の速数を４速に下げてもなお浴室暖房装置１から浴室内に供給される熱量が過剰であることを意味している。そこで、コントローラ２０は、時刻ｔ₃から、循環ファン２４を３速で時間Ｔ2の間だけ回転させる「暖房０サイクル」を実行し、浴室内に供給される熱量を減少させて浴室内の温度上昇を抑制している。
【００３８】
ここで、上述したように、速数３以下では室温サーミスタ２９により浴室内の温度を精度良く検知することができない。そこで、コントローラ２０は、「暖房０サイクル」が終了した時刻ｔ₄から、循環ファン２４を４速で時間Ｔ3の間だけ回転させる「暖房１サイクル」を実行し、「暖房１サイクル」が終了した時刻ｔ₅で、室温サーミスタ２９の検出温度を目標温度（Ｔａ）と比較する。
【００３９】
図３のグラフでは、時刻ｔ₅で室温サーミスタ２９の検出温度が目標温度（Ｔａ）−２℃よりも低くなっている。そこで、コントローラ２０は、時刻ｔ₅から、再び「暖房２サイクル」を実行して浴室内に供給される熱量を増加させ、室温サーミスタ２９の検出温度が目標温度（Ｔａ）に達した時刻ｔ₆で「暖房２サイクル」を終了し、時刻ｔ₆から「暖房３サイクル」を実行する。
【００４０】
一方、時刻ｔ₅で室温サーミスタ２９の検出温度が目標温度（Ｔａ）−２℃以上で目標温度（Ｔａ）以下の範囲内であったときは、浴室内に供給される熱量が適当であると判断できるので、コントローラ２０は、再度「暖房１サイクル」を実行して浴室内に供給される熱量を変更しない。
【００４１】
また、時刻ｔ₅で室温サーミスタ２９の検出温度が目標温度（Ｔａ）を超えていたときには、コントローラ２０は、浴室内の温度を下げるために再度「暖房０サイクル」を実行する。このように、時刻ｔ₅における室温サーミスタ２９の検出温度に応じて、循環ファン２４の速数を設定することにより、コントローラ２０は、浴室内の温度を目標温度（Ｔａ）付近に保っている。
【００４２】
次に、「暖房０サイクル」においては、循環ファン２４は３速で回転しており、次の「暖房１サイクル」に移行するまで、コントローラ２０は室温サーミスタ２９により浴室内の温度を精度良く検知することはできない。
【００４３】
しかし、「暖房０サイクル」の実行中に、使用者がリモコンを操作して風量や温度の設定を変更することが考えられる。そして、この場合に、「暖房０サイクル」が終了するまでの間、変更された設定に応じた処理を行わないとすると、変更結果が暖房運転に反映されるまでに時間遅れを生じ、使用者に違和感を与えてしまうという不都合がある。
【００４４】
また、「暖房０サイクル」の実行中に、使用者が浴室の窓を開けて換気を行うことが考えられる。この場合、外気により浴室内の温度が急激に低下するが、「暖房０サイクル」を継続すると、浴室内の温度が下がったにも拘わらず、循環ファン２４の回転数が低速のままとなって浴室内の温度が低下した状態が回復せず、入浴者が寒さを感じてしまうという不都合がある。
【００４５】
そこで、これらの不都合を解消するため、コントローラ２０は、図４〜図５のフローチャートに示した処理を行って「暖房０サイクル」を実行する。図４を参照して、コントローラ２０は、ＳＴＥＰ１で循環ファン２４の回転数を３速とし、ＳＴＥＰ２で設定時間をＴ2とするタイマ（以下、Ｔ2タイマという）をスタートさせて、「暖房０サイクル」の実行を開始する。
【００４６】
そして、コントローラ２０は、ＳＴＥＰ３で使用者により温度を上げる設定がなされたか否かを確認し、ＳＴＥＰ４で使用者により風量を上げる設定がなされた否かを確認し、ＳＴＥＰ５で室温サーミスタ２９の検出温度が目標温度（Ｔａ）−３℃よりも低くなったか否かを確認しながら、ＳＴＥＰ６でＴ2タイマがタイムアップするのを待つ。
【００４７】
ＳＴＥＰ６でＴ2タイマがタイムアップすると、コントローラ２０は、「暖房０サイクル」を終了し、ＳＴＥＰ７に進んで「暖房１サイクル」を実行する。一方、ＳＴＥＰ３で使用者により温度を上げる変更がなされたとき、ＳＴＥＰ４で使用者により風量を上げる変更がなされたとき、及びＳＴＥＰ５で室温サーミスタ２９の検出温度が目標温度（Ｔａ）−３℃（本発明の所定温度幅に相当する）よりも低くなったときは、図５のＳＴＥＰ１０に分岐する。
【００４８】
そして、コントローラ１０は、ＳＴＥＰ１０で循環ファン２４の回転数を６速に上げ、浴室内の空気が循環して室温サーミスタ２９の検出温度が実際の浴室内の温度とほぼ一致するようになるのを待つため、次のＳＴＥＰ１１で２分タイマをスタートさせる。そして、ＳＴＥＰ１２で、２分タイマがタイムアップしたときに、ＳＴＥＰ１３に進み、コントローラ２０は、室温サーミスタ２９の検出温度が目標温度（Ｔａ）を超えているか否かを確認する。
【００４９】
ＳＴＥＰ１３で室温サーミスタ２９の検出温度が目標温度（Ｔａ）を超えていたときは、目標温度（Ｔａ）に対して現状の浴室内への熱の供給量が過大であると判断できるので、コントローラ２０は、図４のＳＴＥＰ１に戻って「暖房０サイクル」を再び実行する。
【００５０】
また、ＳＴＥＰ１３で室温サーミスタ２９の検出温度が目標温度（Ｔａ）以下であったときは、ＳＴＥＰ２０に分岐し、コントローラ２０は、室温サーミスタ２９の検出温度が目標温度（Ｔａ）−２℃以上であるか否かを確認する。そして、室温サーミスタ２９の検出温度が目標温度（Ｔａ）−２℃以上であったときは、浴室暖房装置１から浴室内への熱の供給が適当であると判断できるので、ＳＴＥＰ２１に進み、コントローラ２０は、循環ファン２４の回転数を１段階上げた「暖房１サイクル」を実行する。
【００５１】
一方、ＳＴＥＰ２０で、室温サーミスタ２９の検出温度が目標温度（Ｔａ）−２℃よりも低かったときには、浴室暖房装置１から浴室内への熱量の供給が不足していると判断できるので、ＳＴＥＰ３０に分岐し、コントローラ２０は、循環ファン２４の回転数を３段階上げた「暖房２サイクル」を実行する。これにより、「暖房０サイクル」において、使用者により温度を上げる変更又は風量を上げる変更がなされたとき、及び浴室内の温度が急に低下したときに、浴室内の温度を目標温度（Ｔａ）まで速やかに上昇させることができる。
【００５２】
なお、本実施の形態では、図４〜図５に示したように、循環ファン２４を前記下限回転数よりも低い回転数で回転させる「暖房０サイクル」を実行中に、使用者により温度を上げる変更がなされたとき（ＳＴＥＰ３）、使用者により風量を上げる変更がなされたとき（ＳＴＥＰ４）、及び、室温サーミスタ２９の検出温度が目標温度（Ｔａ）−３℃よりも低くなったとき（ＳＴＥＰ５）、という３つの条件の成否を確認して、図５に示した処理を行うようにしたが、これらの３つの条件のうちの少なくとも１つの条件の成否を確認する場合であれば本発明の利益を得ることができる。
【００５３】
また、本実施の形態では、浴室の天井面に設置した浴室暖房装置を示したが、浴室の壁面に設置する壁掛け設置型の浴室暖房装置に対しても本発明の適用が可能である。
【００５４】
また、本実施の形態では、暖房運転において循環ファン２４の速数を「暖房０サイクル」〜「暖房３サイクル」の４段階で切換えたが、さらに多くの段階に切換えるようにしてもよい。
【図面の簡単な説明】
【図１】浴室暖房装置の設置状態を示した図。
【図２】図１に示した浴室暖房装置の全体構成図。
【図３】暖房運転時における循環ファンの速数の切換えと浴室の温度の推移を示したグラフ。
【図４】「暖房０サイクル」の実行フローチャート。
【図５】「暖房０サイクル」の実行フローチャート。
【符号の説明】
１…浴室暖房装置、３…浴室、６…熱源機、９…中間ダクト、１１…リモコン、２０…コントローラ、２１…熱交換器、２２…熱動弁、２４…循環ファン、２８…温水サーミスタ、２９…室温サーミスタ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bathroom heating device that heats a bathroom using hot water as a heat source.
[0002]
[Prior art]
Conventionally, there is a bathroom heating apparatus that includes a hot water type heat exchanger that is supplied with hot water at a predetermined temperature as a heat source and that heats the air heated by the heat exchanger into the bathroom as warm air to heat the bathroom. Are known. In such a bathroom heating device, temperature control is performed so that the temperature in the bathroom is maintained at a target temperature set by a temperature setting switch or the like after the start of the heating operation.
[0003]
The bathroom temperature sensor that detects the temperature in the bathroom is generally provided in a path through which the air in the bathroom is sucked by a circulation fan that circulates the air in the bathroom via the heat exchanger. However, in this case, in order to detect the temperature in the bathroom by the bathroom temperature sensor, the blower fan is rotated at a rotation speed of a certain level or more to sufficiently circulate the air in the bathroom, and the air in the bathroom is circulated. It is necessary to generate an air volume that can be introduced to the temperature sensor.
[0004]
Therefore, when heating operation is performed while detecting the temperature in the bathroom by the bathroom temperature sensor, the rotation speed of the blower fan is sufficiently circulated during the heating operation, and the air in the bathroom is sufficiently circulated so that the air in the bathroom is converted into the bathroom temperature. It is required to keep the rotational speed above the lower limit rotational speed that generates the air volume necessary to introduce the sensor.
[0005]
However, when the bathroom is narrow with respect to the heating capacity of the bathroom heater or when the difference between the target temperature and the outside air temperature is small, the temperature in the bathroom is the target even if the rotational speed of the blower fan is reduced to the lower limit rotational speed. The temperature may be exceeded and the temperature in the bathroom may not be maintained at the target temperature. Therefore, in such a case, it is conceivable to suppress an increase in the temperature in the bathroom by rotating the blower fan at a rotation speed lower than the lower limit rotation speed for a predetermined time.
[0006]
However, the inventors of the present application, as described above, when the blower fan is rotated at a rotation speed lower than the lower limit rotation speed for a predetermined time, the bathroom temperature sensor accurately detects the temperature in the bathroom during the predetermined time. It has been found that various inconveniences can occur because it is impossible.
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above background, and when the heating operation is performed, the blower fan is rotated for a predetermined time at a rotation speed lower than a lower limit rotation speed that generates an air volume capable of detecting the temperature in the bathroom. It is an object of the present invention to provide a bathroom heating apparatus that prevents the occurrence of inconvenience that may occur when the temperature rise in the bathroom is suppressed.
[0008]
[Means for Solving the Problems]
The present invention has been made in order to achieve the above-described object, and includes a heat exchanger using hot water supplied at a predetermined temperature as a heat source, and sucking air through the heat exchanger and the heat exchanger. A fan that blows the air that has passed into the bathroom, a bathroom temperature sensor provided in an inflow path of air sucked by the fan, and the fan being operated in a state where hot water is supplied to the heat exchanger The air heated by passing through the heat exchanger is blown into the bathroom, and a heating operation is performed to control the rotational speed of the fan so that the temperature detected by the bathroom temperature sensor matches a predetermined target temperature. Heating control means, and when the heating operation is performed, the heating control means reduces the rotation speed of the fan to a lower limit rotation speed that generates an air volume capable of detecting the temperature in the bathroom by the bathroom temperature sensor. When the detected temperature of Do not the full temperature sensor even exceeds the target temperature, an improvement of bathroom heating device for actuating a predetermined time at a low speed rotational speed of the fan is set lower than the lower limit engine speed.
[0009]
And the 1st aspect of this invention aims at eliminating the problem which arises when the target temperature setting means which sets the said target temperature is provided. That is, when the target temperature setting means is changed to increase the target temperature within the predetermined time during which the fan is rotating at the low-speed rotation speed set lower than the lower limit rotation speed, the predetermined time If the rotation speed of the fan is maintained at the low speed rotation speed until the time elapses, the amount of heat supplied from the bathroom heating device is maintained until the predetermined time elapses despite the increase in the target temperature. Since it does not increase, there is an inconvenience that a time delay occurs until the temperature in the bathroom starts to rise, causing the bather to feel uncomfortable.
[0010]
Therefore, the first aspect of the present invention includes a target temperature setting means for setting the target temperature, and the heating control means has been changed to increase the target temperature by the target temperature setting means within the predetermined time. Sometimes, the fan is operated at a rotational speed equal to or higher than the lower limit rotational speed until the temperature detected by the bathroom temperature sensor becomes equal to or higher than the target temperature.
[0011]
According to the present invention, when the target temperature setting means is changed to increase the target temperature within the predetermined time, the heating control means until the temperature detected by the bathroom temperature sensor becomes equal to or higher than the target temperature. The fan is rotated at a rotational speed equal to or higher than the lower limit rotational speed. Therefore, according to the change to raise the target temperature, the amount of heat supplied from the bathroom heating device to the bathroom increases without causing a delay time, and the temperature in the bathroom is quickly raised to the changed target temperature. Can do.
[0012]
The second aspect of the present invention aims to eliminate the inconvenience caused when a rotation speed range setting means for setting the rotation speed control range of the fan is provided. That is, the rotational speed range of the fan is shifted to a high rotational speed range by the rotational speed range setting means within the predetermined time during which the fan is rotating at the low speed rotational speed set lower than the lower limit rotational speed. When the change is made, until the predetermined time elapses, the fan rotation speed control range is shifted to the high rotation range, but the fan is in the period until the predetermined time elapses. Since the rotational speed is maintained at the low rotational speed, there is a disadvantage that a time delay occurs until the rotational speed of the fan starts to increase, which gives the bather an uncomfortable feeling.
[0013]
Therefore, a second aspect of the present invention includes a rotation speed range setting unit that sets a control range of the rotation speed of the fan in the heating operation, and the heating control unit sets the rotation speed range within the predetermined time. When the change of the control range of the rotation speed of the fan in the high rotation direction is made by the means, the fan is rotated at the rotation speed equal to or higher than the lower limit rotation speed until the temperature detected by the bathroom temperature sensor becomes equal to or higher than the target temperature. It is characterized by operating with numbers.
[0014]
According to the present invention, when the rotation speed range setting means changes the fan rotation speed control range to a high rotation direction within the predetermined time, the heating control means is configured to transmit the bathroom temperature sensor. Until the detected temperature becomes equal to or higher than the target temperature, the fan is rotated at a rotational speed equal to or higher than the lower limit rotational speed. Therefore, according to the change which raises the control range of the rotation speed of the said fan to a high rotation direction, the rotation speed of the said fan can be raised rapidly, without producing delay time.
[0015]
In addition, the third aspect of the present invention occurs when the temperature in the bathroom is drastically decreased within the predetermined time during which the fan is rotating at the low speed rotation speed set lower than the lower limit rotation speed. The purpose is to eliminate the inconvenience. That is, for example, when a bather opens a bathroom window for ventilation within the predetermined time, outside air flows into the bathroom and the temperature in the bathroom rapidly decreases. And in this case, since the rotation speed of the fan is maintained at the low-speed rotation speed until the predetermined time elapses, it is difficult for the temperature in the lowered bathroom to rise, and the temperature in the bathroom remains lowered. There is a disadvantage that the bather feels cold.
[0016]
Therefore, according to a third aspect of the present invention, when the heating control means grasps that the detected temperature of the bathroom temperature sensor has decreased by a predetermined temperature range or more from the target temperature within the predetermined time, the bathroom temperature The fan is operated at a rotational speed equal to or higher than the lower limit rotational speed until a temperature detected by the sensor becomes equal to or higher than the target temperature.
[0017]
According to the present invention, when the temperature detected by the bathroom temperature sensor falls within the predetermined time from the target temperature by the predetermined temperature range or more, the heating control means detects the temperature detected by the bathroom temperature sensor above the target temperature. The fan is operated at a rotational speed equal to or higher than the lower limit rotational speed until Therefore, when the temperature in the bathroom rapidly decreases, the rotation speed of the fan increases, and the temperature in the bathroom can be quickly returned to the target temperature.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
An example of an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing an installation state of the bathroom heating device of the present invention, FIG. 2 is an overall configuration diagram of the bathroom heating device shown in FIG. 1, and FIG. The graph which showed transition of temperature, FIG.4 and FIG.5 are execution flowcharts of heating operation.
[0019]
Referring to FIG. 1, a bathroom heating device 1 is installed on a ceiling portion of a bathroom 3 provided with a bathtub 2, and is operated by electric power supplied from a commercial power outlet 4 through a breaker 5. The bathroom heater 1 is communicably connected to the heat source unit 6 and the heat source unit cable 7, and hot water of a predetermined temperature is supplied from the heat source unit 6 to the bathroom heater 1 via the hot water supply pipe 8 a. It returns to the heat source machine 6 through the return pipe 8b.
[0020]
Further, the bathroom heating device 1 communicates with an intermediate duct 9 for ventilating the bathroom 3, and a remote controller 11 (target temperature setting means of the present invention) for setting an operation mode or the like via a remote control cable 10. And the function of the rotation speed range setting means) are connected.
[0021]
Next, referring to FIG. 2, the bathroom heating device 1 includes a controller 20 (including the function of the heating control means of the present invention) that controls the overall operation of the bathroom heating device 1, and a hot water supply pipe 8 a. The heat exchanger 21 that heats air using the supplied hot water as a heat source, the thermal valve 22 that opens and closes the hot water supply pipe 8a, and the air sucked from the air inlet 23 is heated by the heat exchanger 21 as hot air in the bathroom. Circulating fan 24 to be sent out (corresponding to the fan of the present invention), fan motor 25 for operating the circulating fan 24, looper 26 for setting the direction of the air to be sent out, looper motor 27 for operating the looper 26, heat source machine 6, a hot water thermistor 28 for detecting the temperature of hot water supplied from 6, and a room temperature thermistor 29 for detecting the temperature of the air in the bathroom (= bathroom temperature) sucked from the air inlet 23 (the bath room temperature of the present invention). Corresponding to the sensor), earth leakage breaker 30 comprises a remote control connector 31, the heat source equipment connector 32, power supply connector 33, and an intermediate duct fan connector 34.
[0022]
In addition, an intermediate duct fan 40 is installed in the middle of the intermediate duct 9, and the controller 20 transmits a control signal to the intermediate duct fan 40 via the intermediate duct fan connector 34 and the intermediate duct fan cable 41. The operation / stop of the intermediate duct fan 40 is controlled.
[0023]
The controller 20 performs “heating”, “cool air”, “drying”, “ventilation”, and “freezing” shown in Table 1 below according to the operation of an operation mode changeover switch (not shown) provided in the remote controller 11. The bathroom heating device 1 is operated in each operation mode of “prevention”.
[0024]
[Table 1]

[0025]
The remote controller 11 also has an air volume switching for setting the air volume control range of the circulation fan 24 (corresponding to the rotational speed control range of the present invention) in three stages of “strong”, “weak”, and “fine”. A switch (not shown, corresponding to the rotational speed range setting means of the present invention) and a temperature changeover switch (not shown) for setting the target temperature in the heating mode in three stages of “high”, “medium”, and “low” , Corresponding to the target temperature setting means of the present invention).
[0026]
Then, as shown in Table 2 below, the controller 20 changes the rotation speed of the circulation fan 24 in the heating mode into six stages from 1st to 6th according to the operation of the air volume changeover switch and the temperature changeover switch. Set with. It should be noted that the rotational speed of the circulation fan 24 is set higher as the speed number increases.
[0027]
[Table 2]

[0028]
As shown in Table 2 above, in the heating mode, the controller 20 switches the speed of the circulation fan 24 in four types of cycles of heating 0 to heating 3, and the air volume in each cycle (heating 0 to heating 3). Is set based on Table 2 above.
[0029]
Here, the room temperature thermistor 29 is provided in the inflow path of the air in the bathroom sucked from the air inlet 23 by the circulation fan 24. When the rotation speed of the circulation fan 24 is low, the circulation of the air in the bathroom is performed. Insufficient, a difference occurs between the actual temperature in the bathroom and the detected temperature of the room temperature thermistor 29, and the room temperature cannot be detected accurately.
[0030]
In the present embodiment, the 4th to 6th speeds ensure that the actual temperature in the bathroom and the detected temperature of the room temperature thermistor 29 substantially coincide with each other, and the air volume capable of accurately detecting the temperature in the bathroom is secured. The rotation speed is set higher than the lower limit rotation speed that can be achieved. Therefore, the controller 20 basically detects the temperature in the bathroom by the room temperature thermistor 29 when the circulation fan 24 rotates at the fourth speed or higher.
[0031]
In the heating mode, the controller 20 detects the temperature in the bathroom with the room temperature thermistor 29, and the temperature in the bathroom is set in advance corresponding to “high”, “medium”, and “low” set by the remote controller 11. A heating operation for switching the speed of the circulation fan 24 is performed so that the target temperature is maintained. Hereinafter, the operation of the controller 20 in the heating operation will be described.
[0032]
When the user sets an operation mode switch (not shown) provided on the remote controller 11 to “heating” and turns on the operation switch (not shown), the controller 20 opens the thermal valve 22 and Then, a control signal for instructing the start of operation is transmitted to the heat source unit 6 via the heat source unit cable 7.
[0033]
As a result, the heat source unit 6 is activated, and supply of hot water at a predetermined temperature (for example, 80 ° C.) is started from the heat source unit 6 to the heat exchanger 21 via the hot water supply pipe 8a. Then, the controller 20 waits for the temperature detected by the hot water thermistor 28 to become a predetermined level or higher (for example, 40 ° C. or higher) in order to prevent cold air from being supplied into the bathroom, and then operates the circulation fan 24. Start sending warm air to the bathroom.
[0034]
FIG. 3 is a graph showing changes in the speed and room temperature of the circulation fan 24 when the airflow is “strong” and the temperature is set to “high” and the heating operation is started, and the horizontal axis represents time (t ), The vertical axis is set from the top to the speed of the circulation fan 24 (1st to 6th speed), ON / OFF of the thermal valve 22 and the temperature in the bathroom. Referring to FIG. 3, at time t ₀ when the heating operation instruction is given, the controller 20 opens the thermal valve 22 and operates the heat source unit 6 as described above.
[0035]
Then, at the time t ₁ when the detected temperature of the hot water thermistor 28 becomes equal to or higher than a predetermined level, the circulation fan 24 starts to rotate, and the circulation fan 24 is moved to the sixth speed until the detected temperature of the room temperature thermistor 29 reaches the target temperature (Ta). Execute “Heating 2 Cycles” rotating at
[0036]
Next, the controller 20 executes “heating 3 cycle” in which the circulation fan 24 is rotated at the 4th speed for the time T1 from time t ₂ when the temperature detected by the room temperature thermistor 29 becomes equal to or higher than the target temperature (Ta). At time t ₃ when the “heating 3 cycle” is completed, the detected temperature of the room temperature thermistor 29 is compared with the target temperature (Ta). In this way, by reducing the rotational speed of the circulation fan 24 step by step and suppressing the rapid decrease in the amount of warm air delivered, the controller 20 makes the bather cold due to the gap air and cold radiation from the wall surface. To reduce the feeling.
[0037]
In the graph of FIG. 3, the detected temperature of the room temperature thermistor 29 exceeds the target temperature (Ta) at time t ₃ . This means that even if the speed of the circulation fan 24 is lowered to the fourth speed, the amount of heat supplied from the bathroom heating device 1 into the bathroom is still excessive. Therefore, from time t ₃ , the controller 20 executes “heating 0 cycle” in which the circulation fan 24 is rotated at the third speed for the time T 2, and the amount of heat supplied into the bathroom is decreased to increase the temperature in the bathroom. Is suppressed.
[0038]
Here, as described above, at a speed of 3 or less, the room temperature thermistor 29 cannot accurately detect the temperature in the bathroom. Therefore, the controller 20 executes “heating 1 cycle” in which the circulation fan 24 is rotated at the fourth speed for the time T3 from the time t ₄ when the “heating 0 cycle” is completed, and the “heating 1 cycle” is completed. At time t ₅ , the temperature detected by the room temperature thermistor 29 is compared with the target temperature (Ta).
[0039]
In the graph of FIG. 3, the detected temperature of the room temperature thermistor 29 is lower than the target temperature (Ta) −2 ° C. at time t ₅ . Therefore, the controller 20 executes “heating 2 cycle” again from time t ₅ to increase the amount of heat supplied into the bathroom, and time t ₆ when the temperature detected by the room temperature thermistor 29 reaches the target temperature (Ta). Then, the “heating 2 cycle” is completed, and the “heating 3 cycle” is executed from time t ₆ .
[0040]
On the other hand, when the detected temperature of the room temperature thermistor 29 is within the range of the target temperature (Ta) −2 ° C. to the target temperature (Ta) at time t ₅ , the amount of heat supplied to the bathroom is appropriate. Since the determination can be made, the controller 20 does not change the amount of heat supplied into the bathroom by executing “heating 1 cycle” again.
[0041]
When the detected temperature of the room temperature thermistor 29 exceeds the target temperature (Ta) at time t ₅ , the controller 20 executes the “heating 0 cycle” again to lower the temperature in the bathroom. Thus, the controller 20 maintains the temperature in the bathroom near the target temperature (Ta) by setting the speed of the circulation fan 24 according to the temperature detected by the room temperature thermistor 29 at time t ₅ .
[0042]
Next, in the “heating 0 cycle”, the circulation fan 24 rotates at the third speed, and the controller 20 accurately detects the temperature in the bathroom by the room temperature thermistor 29 until the next “heating 1 cycle” is started. I can't do it.
[0043]
However, it is conceivable that the user changes the settings of the air volume and temperature by operating the remote controller during the “heating 0 cycle”. In this case, if the process according to the changed setting is not performed until the “heating 0 cycle” is completed, a time delay occurs until the change result is reflected in the heating operation. There is an inconvenience that gives a sense of incongruity.
[0044]
In addition, it is conceivable that a user opens a bathroom window and performs ventilation during execution of the “heating 0 cycle”. In this case, the temperature in the bathroom suddenly decreases due to the outside air. However, if the “heating 0 cycle” is continued, the rotational speed of the circulation fan 24 remains low even though the temperature in the bathroom has decreased. There is an inconvenience that the bath temperature does not recover and the bather feels cold.
[0045]
Therefore, in order to eliminate these inconveniences, the controller 20 performs the “heating 0 cycle” by performing the processing shown in the flowcharts of FIGS. Referring to FIG. 4, the controller 20 starts a timer (hereinafter referred to as a T2 timer) in which the rotation speed of the circulation fan 24 is set to the third speed in STEP 1 and the set time is T2 in STEP 2, and “heating 0 cycle” is started. Start running.
[0046]
Then, the controller 20 confirms whether or not the setting for raising the temperature is made by the user in STEP3, confirms whether or not the setting for raising the air volume is made by the user in STEP4, and detects the temperature detected by the room temperature thermistor 29 in STEP5. Is waiting for the T2 timer to expire in STEP 6 while confirming whether the temperature has become lower than the target temperature (Ta) -3 ° C.
[0047]
When the T2 timer expires in STEP 6, the controller 20 ends the “heating 0 cycle” and proceeds to STEP 7 to execute the “heating 1 cycle”. On the other hand, when the temperature is changed by the user in STEP 3, when the air volume is changed by the user in STEP 4, and in STEP 5, the detected temperature of the room temperature thermistor 29 is the target temperature (Ta) -3 ° C. (this When the temperature falls below (corresponding to the predetermined temperature range of the invention), the process branches to STEP 10 in FIG.
[0048]
Then, the controller 10 increases the rotation speed of the circulation fan 24 to 6th speed in STEP 10 so that the air in the bathroom circulates and the detected temperature of the room temperature thermistor 29 becomes substantially equal to the actual temperature in the bathroom. To wait, the 2-minute timer is started at the next STEP11. Then, in STEP12, when the 2-minute timer expires, the process proceeds to STEP13, where the controller 20 checks whether or not the detected temperature of the room temperature thermistor 29 exceeds the target temperature (Ta).
[0049]
When the detected temperature of the room temperature thermistor 29 exceeds the target temperature (Ta) in STEP 13, it can be determined that the current supply amount of heat into the bathroom is excessive with respect to the target temperature (Ta). Returns to STEP 1 in FIG. 4 and executes the “heating 0 cycle” again.
[0050]
If the detected temperature of the room temperature thermistor 29 is equal to or lower than the target temperature (Ta) in STEP 13, the process branches to STEP 20, and the controller 20 detects that the detected temperature of the room temperature thermistor 29 is equal to or higher than the target temperature (Ta) -2 ° C. Check whether or not. When the temperature detected by the room temperature thermistor 29 is equal to or higher than the target temperature (Ta) −2 ° C., it can be determined that the supply of heat from the bathroom heating device 1 to the bathroom is appropriate. 20 executes “heating 1 cycle” in which the rotational speed of the circulation fan 24 is increased by one stage.
[0051]
On the other hand, when the detected temperature of the room temperature thermistor 29 is lower than the target temperature (Ta) −2 ° C. in STEP 20, it can be determined that the amount of heat supplied from the bathroom heating device 1 to the bathroom is insufficient. The controller 20 branches and executes the “heating 2 cycle” in which the rotational speed of the circulation fan 24 is increased by three stages. Thus, in the “heating 0 cycle”, when the temperature is changed or the air volume is changed by the user and when the temperature in the bathroom is suddenly lowered, the temperature in the bathroom is set to the target temperature (Ta). Can be quickly raised.
[0052]
In the present embodiment, as shown in FIGS. 4 to 5, the temperature is set by the user during the “heating 0 cycle” in which the circulation fan 24 is rotated at a rotation speed lower than the lower limit rotation speed. When a change to increase (STEP 3), a change to increase the air volume by the user (STEP 4), and a detected temperature of the room temperature thermistor 29 becomes lower than the target temperature (Ta) -3 ° C. (STEP 5) 5), the process shown in FIG. 5 is performed. If the success or failure of at least one of these three conditions is confirmed, the process of the present invention is performed. You can make a profit.
[0053]
Further, in the present embodiment, the bathroom heating device installed on the ceiling surface of the bathroom is shown, but the present invention can also be applied to a wall-mounted bathroom heating device installed on the wall surface of the bathroom.
[0054]
In the present embodiment, the speed of the circulation fan 24 is switched in four stages of “heating 0 cycle” to “heating 3 cycle” in the heating operation, but it may be switched to more stages.
[Brief description of the drawings]
FIG. 1 is a diagram showing an installation state of a bathroom heating device.
FIG. 2 is an overall configuration diagram of the bathroom heating apparatus shown in FIG.
FIG. 3 is a graph showing the change in the speed of the circulation fan and the transition of the bathroom temperature during heating operation.
FIG. 4 is an execution flowchart of “heating 0 cycle”;
FIG. 5 is an execution flowchart of “heating 0 cycle”.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Bathroom heating apparatus, 3 ... Bathroom, 6 ... Heat source machine, 9 ... Intermediate duct, 11 ... Remote control, 20 ... Controller, 21 ... Heat exchanger, 22 ... Thermal valve, 24 ... Circulation fan, 28 ... Hot water thermistor, 29 ... Room temperature thermistor

Claims

A heat exchanger that uses hot water supplied at a predetermined temperature as a heat source, a fan that sucks air through the heat exchanger and blows the air that has passed through the heat exchanger into the bathroom, and is sucked by the fan A bathroom temperature sensor provided in the inflow path of the air to be heated, and air heated through the heat exchanger by operating the fan while hot water is supplied to the heat exchanger. Heating control means for performing a heating operation for controlling the number of rotations of the fan so that the detected temperature of the bathroom temperature sensor matches a predetermined target temperature,
Even when the heating control means reduces the rotation speed of the fan to the lower limit rotation speed that generates an air volume that can detect the temperature in the bathroom by the bathroom temperature sensor during the heating operation, the bathroom temperature sensor When the detected temperature exceeds the target temperature, in the bathroom heating device that operates the fan for a predetermined time at a low rotational speed set lower than the lower limit rotational speed,
Comprising target temperature setting means for setting the target temperature;
The heating control means lowers the fan until the temperature detected by the bathroom temperature sensor becomes equal to or higher than the target temperature when the target temperature is changed by the target temperature setting means within the predetermined time. A bathroom heating device that is operated at a rotational speed equal to or higher than the rotational speed.

A heat exchanger that uses hot water supplied at a predetermined temperature as a heat source, a fan that sucks air through the heat exchanger and blows the air that has passed through the heat exchanger into the bathroom, and is sucked by the fan A bathroom temperature sensor provided in the inflow path of the air to be heated, and air heated through the heat exchanger by operating the fan while hot water is supplied to the heat exchanger. Heating control means for performing a heating operation for controlling the number of rotations of the fan so that the detected temperature of the bathroom temperature sensor matches a predetermined target temperature,
Even if the heating control means reduces the rotation speed of the fan to the lower limit rotation speed that generates an air volume that can detect the temperature in the bathroom by the bathroom temperature sensor during the heating operation, the bathroom temperature sensor When the detected temperature exceeds the target temperature, in the bathroom heating device that operates the fan for a predetermined time at a low rotational speed set lower than the lower limit rotational speed,
A rotation speed range setting means for setting a control range of the rotation speed of the fan in the heating operation;
The heating control means detects the temperature detected by the bathroom temperature sensor when the change of the rotation speed control range of the fan in the high rotation direction is made by the rotation speed range setting means within the predetermined time. The bathroom heating device, wherein the fan is operated at a rotational speed equal to or higher than the lower limit rotational speed until the temperature reaches a temperature or higher.

A heat exchanger that uses hot water supplied at a predetermined temperature as a heat source, a fan that sucks air through the heat exchanger and blows the air that has passed through the heat exchanger into the bathroom, and is sucked by the fan A bathroom temperature sensor provided in the inflow path of the air to be heated, and air heated through the heat exchanger by operating the fan while hot water is supplied to the heat exchanger. Heating control means for performing a heating operation for controlling the number of rotations of the fan so that the detected temperature of the bathroom temperature sensor matches a predetermined target temperature,
Even when the heating control means reduces the rotation speed of the fan to the lower limit rotation speed that generates an air volume that can detect the temperature in the bathroom by the bathroom temperature sensor during the heating operation, the bathroom temperature sensor When the detected temperature exceeds the target temperature, in the bathroom heating device that operates the fan for a predetermined time at a low rotational speed set lower than the lower limit rotational speed,
When the heating control means grasps that the detected temperature of the bathroom temperature sensor has fallen from the target temperature by a predetermined temperature width or more within the predetermined time, the detected temperature of the bathroom temperature sensor becomes equal to or higher than the target temperature. Until the fan is operated at a rotational speed equal to or higher than the lower limit rotational speed.