JP3770181B2

JP3770181B2 - Heating and hot water supply device

Info

Publication number: JP3770181B2
Application number: JP2002055507A
Authority: JP
Inventors: 栄一辻; 浩次岸尾
Original assignee: Noritz Corp
Current assignee: Noritz Corp
Priority date: 2002-03-01
Filing date: 2002-03-01
Publication date: 2006-04-26
Anticipated expiration: 2022-03-01
Also published as: JP2003254542A

Description

【０００１】
【発明の属する技術分野】
本発明は、浴室暖房乾燥装置や床暖房装置、ファンヒータ等の温水利用機器に温水を供給するための暖房温水供給装置に関する。
【０００２】
【従来の技術】
（暖房温水供給装置の構成）
図１は暖房温水供給装置の構成を示す概略図である。１はガスを燃焼させて熱交換器２に流れる水又は温水（暖房用熱媒）を加熱するためのガスバーナ（燃焼器）である。熱交換器２の温水出口には高温水往き管３の一端が接続されており、高温水往き管３には、熱交換器２で加熱された高温の温水の温度を計測する出湯温度センサ（サーミスタ）４と、温水を出湯または停止する高温側熱動弁５とが設けられており、高温水往き管３の他端は高温水供給口６となっている。
【０００３】
熱交換器２の温水入口には暖房温水戻り管７の一端が接続されており、暖房温水戻り管７には、熱交換器２の温水入口へ戻る低温の温水の温度を計測する戻り湯温センサ（サーミスタ）８と、湯温変化による管内圧力の変動を吸収させるための膨張タンク９と、循環ポンプ１０とが設けられている。また、暖房温水戻り管７の循環ポンプ１０よりも下流側の位置からは、低温水往き管１１が分岐しており、低温水往き管１１には低温側熱動弁１２が設けられ、低温水往き管１１の他端は低温水供給口１３となっている。暖房温水戻り管７の他端からは高温水戻り管１４と低温水戻り管１５とが分岐しており、高温水戻り管１４の端には高温水回収口１６が設けられ、低温水戻り管１５の端には低温水回収口１７が設けられている。また、高温水往き管３の高温側熱動弁５よりも上流側の位置と暖房温水戻り管７の戻り湯温センサ８よりも上流側の位置との間には、バイパス管１８が接続されている。
【０００４】
しかして、上記機器接続口６と高温水回収口１６との間には、比較的高温の温水を必要とする温水利用機器が接続され、低温水供給口１３と低温水回収口１７との間には、比較的低温の温水を必要とする温水利用機器が接続される。これらの温水利用機器の種類は特に限定されるものではないが、以下の説明においては、高温側の温水利用機器として、浴室の天井や壁に設置されて浴室の暖房、換気、衣類の乾燥等を行なうことができる浴室暖房乾燥装置を機器接続口６と高温水回収口１６の間に接続し、低温側の温水利用機器として、複数枚の床暖房パネルを連結して床暖房を行なう床暖房装置を低温水供給口１３と低温水回収口１７の間に接続している場合を例にとって、従来方式の運転動作を説明する。
【０００５】
（浴室暖房乾燥装置と床暖房装置を運転する場合）
浴室暖房乾燥装置１９と床暖房装置２０の両装置を運転する場合には、循環ポンプ１０を運転開始し、高温側熱動弁５及び低温側熱動弁１２を開弁し、熱交換器２からの出湯温度（出湯温度センサ４の検知温度）が所定の高温設定温度Ｓh（例えば、約８０℃）となるようにガスバーナ１を燃焼制御（以下、高温制御という。）し、図１に矢印で示すような経路で温水を循環させる。すなわち、暖房温水戻り管７から熱交換器２内に入った低温の温水は熱交換器２で加熱され、熱交換器２で加熱された高温の温水は熱交換器２から高温水往き管３へと出湯される。熱交換器２から出湯された高温水は、高温水往き管３を流れ、バイパス管１８が分岐している箇所に達すると、バイパス管１８と浴室暖房乾燥装置１９側とに分岐して流れる。
【０００６】
浴室暖房乾燥装置１９内に流入した温水は、浴室暖房乾燥装置１９内を循環して浴室内の空気と熱交換する。温水と熱交換して加熱された空気は、温風として浴室内に吹き出され、浴室内の暖房等に供される。こうして浴室内の空気と熱交換して温度の下がった温水は、高温水戻り管１４を経て暖房温水戻り管７に流れ込む。一方、高温水往き管３からバイパス管１８へ流れ込んだ高温水は、バイパス管１８を経て、そのまま暖房温水戻り管７に流れ込んでいる。さらに、後述のように、床暖房装置２０から流出した低温水も、低温水回収口１７を経て暖房温水戻り管７に流れ込む。従って、暖房温水戻り管７には、浴室暖房乾燥装置１９を通過して温度の下がった温水と、床暖房装置２０を通過して温度の下がった温水とが回収されており、そこにバイパス管１８からの高温水が混合されることにより混合された温水の温度は、回収された温水の温度よりも高く、バイパス管１８から供給された高温水の温度よりも低くなる。この混合された温水（以下、低温水ということがある。）は、暖房温水戻り管７内を送られ、低温水往き管１１との分岐位置に達すると、低温水往き管１１と熱交換器２側とに分岐して流れる。低温水往き管１１へ流れた低温水は、床暖房装置２０の床暖房パネル内を循環して床暖房パネルを暖めた後、低温水戻り管１５を通って、前記のように暖房温水戻り管７内へ戻る。一方、熱交換器２側へ流れた低温水は、最初に述べたように熱交換器２で加熱されて高温水往き管３へと送られる。この結果、浴室暖房乾燥装置１９には、高温（例えば、８０℃程度）の温水が循環させられ、床暖房装置２０には、低温（例えば、６０℃程度）の温水が循環させられることになる。
【０００７】
（床暖房装置を単独運転する場合）
つぎに、浴室暖房乾燥装置１９を運転停止して床暖房装置２０を単独で運転している場合を説明する。この場合には、循環ポンプ１０を運転開始し、低温側熱動弁１２を開弁し、戻り湯温センサ８の検知温度が所定の低温設定温度Ｓl（例えば、約６０℃）となるようにガスバーナ１を燃焼制御（以下、低温制御という。）し、図２に矢印で示すような経路で温水を循環させる。すなわち、暖房温水戻り管７から熱交換器２内に入った低温の温水は熱交換器２で加熱され、熱交換器２で加熱された温水は熱交換器２から高温水往き管３へ出湯され、高温水往き管３を経てバイパス管１８に流れ、さらに暖房温水戻り管７に流れ込む。一方、床暖房装置２０から流出した温水も、低温水戻り管１５を経て暖房温水戻り管７に流れ込む。従って、暖房温水戻り管７では、床暖房装置２０を通過して温度の下がった温水と、バイパス管１８から供給された温水が混合される。ガスバーナ１は、この混合された温水の温度が上記のように低温設定温度Ｓlとなるように燃焼制御される。この混合された温水（低温水）は、低温水往き管１１との分岐位置に達すると、低温水往き管１１と熱交換器２側とに分岐して流れる。低温水往き管１１へ流れた低温水は、床暖房装置２０の床暖房パネル内を循環して床暖房パネルを暖めた後、低温水戻り管１５を通って、前記のように暖房温水戻り管７内へ戻る。一方、熱交換器２側へ流れた低温水は、最初に述べたように熱交換器２で加熱されて高温水往き管３へと送られる。この結果、床暖房装置２０には、低温（例えば、６０℃程度）の温水が循環させられることになる。
【０００８】
しかし、床暖房装置２０の単独運転を行う場合、戻り湯温センサ８の検知温度が所定の低温設定温度Ｓlとなるようにガスバーナ１を燃焼制御しているだけであると、運転開始時に床暖房装置２０が暖まるまでに時間が掛かり、使用感が悪くなる恐れがある。そのため、従来方式の暖房温水供給装置においては、図３に示すように、床暖房装置２０の単独運転開始時には、所定時間ｔの間は、出湯温度センサ４の検知温度Ｔhが所定の高温設定温度Ｓh（例えば、約８０℃）となるようにガスバーナ１を燃焼制御（以下、これをホットダッシュ制御という。）し、所定時間ｔが経過した後、戻り湯温センサ８の検知温度Ｔlが所定の低温設定温度Ｓlとなるようにガスバーナ１を燃焼させて通常低温制御し、床暖房パネルの温度が速やかに上昇するようにしている。
【０００９】
【発明が解決しようとする課題】
上記のような従来方式の暖房温水供給装置では、床暖房装置２０を単独で定常運転している場合、すなわち戻り湯温センサ８の検知温度Ｔlが低温設定温度Ｓlとなるように制御している場合には、戻り湯温センサ８の検知温度Ｔlが上限温度Ｓl＋αを超えるとガスバーナ１を燃焼停止させ、戻り湯温センサ８の検知温度Ｔlが下限温度Ｓl−βよりも下がるとガスバーナ１を再度点火するように燃焼制御される。
【００１０】
そのため、上記のように床暖房装置２０を単独運転する場合、暖房温水供給装置がホットダッシュ制御から通常低温制御に切り替わった直後には暖房温水戻り管７等の配管内に高温の温水が流れているため、戻り湯温センサ８の検知温度Ｔlが上限温度Ｓl＋αが超えており、そのためホットダッシュ制御から通常低温制御に切り替わった時点でガスバーナ１が消火し、戻り湯温センサ８の検知温度Ｔlが下限温度Ｓl−β以下に下がるまでガスバーナ１が燃焼しないことがあった。
【００１１】
この結果、ホットダッシュ制御により速やかに床暖房パネルの温度を上昇させようとしながら、却ってガスバーナ１の消火により床暖房パネルの温度上昇が遅れるという結果になっていた。
【００１２】
また、このような現象は、床暖房装置２０を単独運転してホットダッシュ制御を行う場合に限らない。ホットダッシュ制御を行わない暖房温水供給装置において、浴室暖房乾燥装置１９と床暖房装置２０を同時に運転している状態（あるいは、浴室暖房乾燥装置１９を単独で運転している状態）から床暖房装置２０の単独運転に切り替えた場合にも、制御温度が出湯温度センサ４による高温設定温度Ｓhから戻り湯温センサ８による低温設定温度Ｓlに切り替わるので、同様な現象が起きる。
【００１３】
本発明は上記のような技術的背景に鑑みてなされたものであり、その第１の目的とするところは、ホットダッシュ制御の機能を有する暖房温水供給装置において、低温の温水を利用する側の温水利用装置がホットダッシュ制御から通常低温制御に切り替わったときに暖房温水供給装置がバーナーの消火等によって温水温度が却って低下してしまうのを防止することにある。
【００１４】
また、本発明の第２の目的とするところは、ホットダッシュ制御が働かない場合に、高温の温水を利用する側の温水利用装置が運転状態から運転停止状態に切り替わったときに、バーナーの消火等によって温水温度が急に低下してしまうのを防止することにある。
【００１５】
【発明の開示】
本発明の請求項１にかかる暖房温水供給装置は、少なくとも２つの制御温度で燃焼器を燃焼させて温水供給温度を切り換えることができると共に、温度センサにより所定箇所の温水温度を検知して該検知温度と所定温度とを比較することによって燃焼器の燃焼を停止させる機能を備えた暖房温水供給装置において、制御温度が高温側から低温側に切り替わった後の所定時間の間は、前記温度センサで検知した前記温水温度と前記所定温度との比較を行なわず、所定時間が経過した後に、前記温度センサで検知した前記温水温度が前記所定温度を越えた時に燃焼器の燃焼を停止させることを特徴としている。
【００１６】
本発明の暖房温水供給装置は、少なくとも２つの制御温度で燃焼器を燃焼させて温水供給温度を切り換えることができるものであって、床暖房装置、浴室暖房乾燥装置、ファンヒータ等の複数台の温水利用機器を接続して各機器に温水を供給するものである。請求項１にいうように、高温側の制御温度から低温側の制御温度へ切り換わる場合としては、高温の温水を必要とする温水利用機器（例えば、浴室暖房乾燥装置）が運転停止されたような場合に限らず、例えば、１台の温水利用機器を運転する場合でも、急速暖房のため運転開始時に通常運転時の温水温度よりも高温の温水を供給することがあり、このような高温の温水が一時的に供給された後、通常運転に戻るような場合（例えば、ホットダッシュ制御と呼ばれる運転方式）も含まれる。
【００１７】
本発明の暖房温水供給装置によれば、高温側の制御温度から低温側の制御温度へ切り換わった後、所定時間の間は、温度センサで検知した温水温度と所定温度との比較を行なわないので、当該所定時間経過後に比べて所定時間の間は燃焼が停止しにくくなっている。従って、高温側の制御温度から低温側の制御温度に切り替わった直後で、高温側の制御温度で運転されていた時の高温水が配管内に残っている場合でも、燃焼停止が起こりにくくなり、暖房用の燃焼利用機器の場合では、燃焼停止によって暖房が停止して室温等が却って低下する不都合を解消することができる。
【００１８】
本発明の請求項３にかかる暖房温水供給装置は、少なくとも２つの制御温度で燃焼器を燃焼させて温水供給温度を切り換えることができると共に、温度センサにより所定箇所の温水温度を検知して該検知温度と所定温度とを比較することによって燃焼器の燃焼を停止させる機能を備えた暖房温水供給装置において、制御温度が高温側から低温側に切り替わった後の所定時間において用いられる燃焼停止のための前記所定温度が、前記所定時間経過後において用いられる燃焼停止のための前記所定温度よりも大きな値となるようにしている。
【００１９】
本発明の請求項２に記載の実施態様においては、低温の温水が流れる箇所に設置された前記温度センサである低温側温度センサと、高温の温水が流れる箇所に設置された高温側温度センサとを備え、制御温度が高温側から低温側へ切り替わった後の所定時間の間は、高温側温度センサの検知温度が所定温度を超えた時に燃焼器の燃焼を停止させ、前記所定時間が経過した後は、高温側温度センサの検知温度及び低温側温度センサの検知温度のうち少なくとも一方の検知温度が、対応するそれぞれの所定温度を超えたときに燃焼器の燃焼を停止させるようにしている。
【００２０】
請求項２の実施態様では、所定時間内では低温側温度センサの検知温度によって燃焼停止させないので、高温側の制御温度から低温側の制御温度に切り替わった際に低温側温度センサが高温水を検知することによって燃焼停止する恐れがない。しかも、この所定時間内でも、高温側温度センサの検知温度が所定温度を超えたときには燃焼器の燃焼を停止させるようにしているので、配管内の温水の沸騰を防止することができ、暖房温水供給装置を安全に運転させることができる。
【００２１】
本発明の請求項４に記載の実施態様においては、低温の温水が流れる箇所に設置された前記温度センサである低温側温度センサと、高温の温水が流れる箇所に設置された高温側温度センサとを備え、制御温度が高温側から低温側へ切り替わった後の所定時間が経過した後は、高温側温度センサの検知温度が第１の所定温度を超えるか、低温側温度センサの検知温度が第２の所定温度を超えるかした場合に燃焼器の燃焼を停止させ、前記所定時間の間は、高温側温度センサの検知温度が第１の所定温度とほぼ等しい所定温度を超えるか、低温側温度センサの検知温度が第２の所定温度よりも大きな値を持つ所定温度を超えるかした場合に燃焼器の燃焼を停止させるようにしている。
【００２２】
請求項４の実施態様では、所定時間内では低温側温度センサの検知温度と比較する所定温度の値を大きくして燃焼停止しにくくしているので、高温側の制御温度から低温側の制御温度に切り替わった際に低温側温度センサが高温水を検知することによって燃焼停止しにくくなる。しかも、この所定時間内でも、高温側温度センサの検知温度が所定温度を超えたときには燃焼器の燃焼を停止させるようにしているので、配管内の温水の沸騰を防止することができ、暖房温水供給装置を安全に運転させることができる。
【００２３】
【発明の実施の形態】
以下、本発明の実施形態を図面に基づいて説明する。本発明にかかる暖房温水供給装置の概略構成や温水の循環経路は、図１及び図２に示したのと同じであるので、冗長を避けるために重複した図面の呈示と再度の説明を省略し、図１及び図２で用いた符号を引用しながら本発明の実施形態を説明する。
【００２４】
（第１の実施形態）
図４及び図５は本発明の一実施形態であって、それぞれ図１及び図２に示したような構成を有するホットダッシュ制御の機能を備えた暖房温水供給装置において、制御部（マイクロプロセッサ及びメモリ）により実行される暖房燃焼停止処理と暖房燃焼開始（再開）処理の各制御手順を表している。まず、暖房温水供給装置が燃焼運転を開始した後、温水温度が上昇し過ぎたことを検知してガスバーナ１の燃焼を一時的に停止するまでの処理（燃焼停止処理）を説明する。暖房温水供給装置が燃焼運転を開始すると、まず、浴室暖房乾燥装置１９がオンになっていて図１のような高温制御を行なうのか、浴室暖房乾燥装置１９がオフになっていて図２のような低温制御を行なうのか、いずれの制御を行なうかによって処理が分岐する（ステップＳ１）。
【００２５】
暖房温水供給装置が図１のような高温制御を行なう場合（ステップＳ１でYESの場合）には、ガスバーナ１は出湯温度センサ４の検知温度Ｔhが高温設定温度Ｓh（例えば、約８０℃）となるように燃焼制御されており、出湯温度センサ４の検知温度Ｔhがその上限温度Ｓh＋α（例えば、α＝７℃）を超えていないか監視されている（ステップＳ２）。出湯温度センサ４の検知温度Ｔhが上限温度Ｓh＋αを超えると、遅延タイマを初期値にリセットした（ステップＳ３）後、ガスバーナ１の燃焼を停止させる（ステップＳ４）。
【００２６】
また、暖房温水供給装置が図２のような低温制御を行なう場合（ステップＳ２でNOの場合）には、暖房温水供給装置の運転開始から所定時間ｔの間は、ホットダッシュ制御を行なう。ここで、ホットダッシュ制御とは、図２のような経路で温水を循環させながら、出湯温度センサ４の検知温度Ｔhが高温設定温度Ｓhとなるように制御するものである。低温制御を開始してから所定時間ｔ内であって、暖房温水供給装置がまだホットダッシュ制御している場合（ステップＳ５において、YESの場合）には、床暖房装置２０に高温の温水が循環するので、床暖房パネルは急速に昇温される。また、ホットダッシュ制御中には、遅延タイマの値Ｎが初期値（例えば、Ｎ＝１００）に設定される（ステップＳ６）ので、遅延タイマは初期値に保持される。このホットダッシュ制御中においては、出湯温度センサ４の検知温度Ｔhがその上限温度Ｓh＋αを超えていないか監視されており（ステップＳ２）、出湯温度センサ４の検知温度が上限温度Ｓh＋αを超えると、遅延タイマを初期値にリセットした（ステップＳ３）後、ガスバーナ１の燃焼が停止させられる（ステップＳ４）。
【００２７】
ホットダッシュ制御開始後、所定時間ｔが経過すると、ホットダッシュ制御が終了する。従来方式であれば、ホットダッシュ制御が終了すると、ただちに制御温度と燃焼停止判定を通常低温制御に移行させ、戻り湯温センサ８による検知温度Ｔlが低温設定温度Ｓlとなるように燃焼制御すると共に、戻り湯温センサ８の検知温度Ｔlが上限温度Ｔl＋αを超えたときに燃焼停止させている。これに対し、ここで説明している実施形態では、次に説明するように、ホットダッシュ制御が終了すると、制御温度のみをただちに通常低温制御に移行させ、燃焼停止判定は所定時間遅延させてから通常低温制御に移行させている。
【００２８】
すなわち、当該実施形態では、ホットダッシュ制御が終了すると（ステップＳ５でNOの場合）、暖房温水供給装置は、戻り湯温センサ８の検知温度Ｔlが低温設定温度Ｓlとなるようにガスバーナ１を低温で燃焼制御する。ついで、遅延タイマの値がＮ＝０となってカウントアップしているか判定する（ステップＳ７）。ホットダッシュ制御が終了した時点では、遅延タイマの値Ｎは初期値に設定されているから、図４のフローの処理サイクル毎に遅延タイマの値Ｎが１ずつカウントダウン（デクリメント）されてゆく（ステップＳ８）。この遅延期間中においては、戻り湯温センサ８の検知温度Ｔlは監視されていないので、低温側の検知温度Ｔlが上限温度Ｓl＋αを超えていても従来方式のように燃焼停止することはない。しかし、出湯温度センサ４で検知されている高温側の検知温度Ｔhが、余熱等によって上限温度Ｓh＋αを超えた場合には（ステップＳ２）、ガスバーナ１の燃焼は停止させられる（ステップＳ３、Ｓ４）。
【００２９】
ホットダッシュ制御終了後、所定時間が経過して遅延タイマの値がＮ＝０となってカウントアップすると（ステップＳ７でYESの場合）、暖房温水供給装置は通常低温制御に完全に移行し、出湯温度センサ４の検知温度Ｔhがその上限温度Ｓh＋αを超えていないか（ステップＳ９）、更に、戻り湯温センサ８の検知温度Ｔlがその上限温度Ｓl＋αを超えていないか（ステップＳ１０）を監視する。そして、出湯温度センサ４の検知温度Ｔhがその上限温度Ｓh＋αを超えるか（ステップＳ９でYESの場合）、あるいは、戻り湯温センサ８の検知温度Ｔlがその上限温度Ｓl＋αを超えるか（ステップＳ１０でYESの場合）すると燃焼を停止する（ステップＳ３、Ｓ４）が、そうでない限り（ステップＳ９及びＳ１０がいずれもNOの場合）通常低温制御を続ける。
【００３０】
よって、この実施形態による暖房温水供給装置によれば、ホットダッシュ制御終了時に燃焼が停止してしまい、却って床暖房装置２０の昇温が妨げられるといった不都合を避けることができる。しかも、ホットダッシュ制御終了後の所定時間の間も高温側にある出湯温度センサ４の検知温度を監視して上限温度Ｓh＋αを超えた場合には燃焼停止させるようにしているので、配管内の温水の沸騰を防止することができ、安全性を損なうことなく快適な暖房制御を行なうことができる。
【００３１】
次に、暖房温水供給装置が燃焼停止した後、ガスバーナ１の燃焼を再開するまでの処理を図５により説明する。暖房温水供給装置が高温制御されている場合（ステップＳ１１でYESの場合）には、出湯温度センサ４の検知温度Ｔhが下限温度Ｓh−β（例えば、β＝７℃）を下回ったときにガスバーナ１の燃焼を開始する（ステップＳ１２、Ｓ１３）。また、暖房温水供給装置が低温制御で、ホットダッシュ制御中にも（ステップＳ１４でYESの場合）にも、出湯温度センサ４の検知温度Ｔhが下限温度Ｓh−β（例えば、β＝７℃）を下回ったときにガスバーナ１の燃焼を開始する（ステップＳ１２、Ｓ１３）。一方、低温制御中で、ホットダッシュ制御の期間が終了している場合には、戻り湯温センサ８の検知温度Ｔlが下限温度Ｓl−βを下回ったときにガスバーナ１の燃焼を開始する。
【００３２】
（第２の実施形態）
図６は本発明の別な実施形態による暖房温水供給装置における燃焼停止時の処理手順を示すフロー図である。この実施形態でも、高温制御中や、低温制御時でホットダッシュ制御中や、低温制御時でホットダッシュ制御後の遅延時間が経過した後の処理は、第１の実施形態の場合と同じである（ステップＳ１〜Ｓ７、Ｓ９〜Ｓ１０）。しかし、低温制御時でホットダッシュ制御終了直後の遅延時間の経過前においては、この実施形態では、出湯温度センサ４の検知温度Ｔhがその上限温度Ｓh＋αを超えていないか（ステップＳ２１）、更に、戻り湯温センサ８の検知温度Ｔlがその上限温度Ｓl＋γ（ここで、γ＞＞α）を超えていないか（ステップＳ２２）を監視する。そして、出湯温度センサ４の検知温度Ｔhがその上限温度Ｓh＋αを超えるか（ステップＳ２１でYESの場合）、あるいは、戻り湯温センサ８の検知温度Ｔlがその上限温度Ｓl＋γを超えるか（ステップＳ２２でYESの場合）すると燃焼を停止する（ステップＳ３、Ｓ４）。
【００３３】
この実施形態では、ステップダッシュ制御後の遅延時間が経過した後も（ステップＳ７でYESの場合）、出湯温度センサ４の検知温度Ｔhがその上限温度Ｓh＋αを超えていないか（ステップＳ９）、更に、戻り湯温センサ８の検知温度Ｔlがその上限温度Ｓl＋αを超えていないか（ステップＳ１０）を監視する。そして、出湯温度センサ４の検知温度Ｔhがその上限温度Ｓh＋αを超えるか（ステップＳ９でYESの場合）、あるいは、戻り湯温センサ８の検知温度Ｔlがその上限温度Ｓl＋αを超えるか（ステップＳ１０でYESの場合）すると燃焼を停止する（ステップＳ３、Ｓ４）。
【００３４】
この実施形態にあっては、上記のようにホットダッシュ制御後の遅延時間経過前においては、燃焼停止のための上限温度Ｓｌ＋γを遅延時間経過後における燃焼停止のための上限温度Ｓｌ＋αよりも十分に高い値に設定しているので、ホットダッシュ制御の終了直後に配管内に残っている高温水を戻り湯温センサ８が検知することによって燃焼停止しにくくなる。
【００３５】
（第３の実施形態）
図７は本発明のさらに別な実施形態による暖房温水供給装置における燃焼停止時の処理手順を示すフロー図である。この実施形態は、高温制御から低温制御に移行した場合には、低温制御におけるホットダッシュ制御を行わないようにし、しかも、その場合に配管内に残っている高温水を戻り湯温センサ８が検知してガスバーナ１が燃焼停止させられる不都合を防止できるようにしたものである。
【００３６】
この実施形態において、暖房温水供給装置が燃焼運転を開始した後、温水温度が上昇し過ぎたことを検知してガスバーナ１の燃焼を一時的に停止するまでの処理（燃焼停止処理）を説明する。暖房温水供給装置が燃焼運転を開始すると、まず、浴室暖房乾燥装置１９がオンになっていて図１のような高温制御を行なうのか、浴室暖房乾燥装置１９がオフになっていて図２のような低温制御を行なうのか、いずれの制御を行なうかによって処理が分岐する（ステップＳ１）。
【００３７】
暖房温水供給装置が図１のような高温制御を行なう場合（ステップＳ１でYESの場合）には、ガスバーナ１は出湯温度センサ４の検知温度Ｔhが高温設定温度Ｓh（例えば、約８０℃）となるように燃焼制御されており、出湯温度センサ４の検知温度Ｔhがその上限温度Ｓh＋α（例えば、α＝７℃）を超えていないか監視されている（ステップＳ２）。出湯温度センサ４の検知温度Ｔhが上限温度Ｓh＋αを超えると、遅延タイマを初期値にリセットした（ステップＳ３）後、ガスバーナ１の燃焼を停止させる（ステップＳ４）。
【００３８】
また、暖房温水供給装置が図２のような低温制御を行なう場合（ステップＳ２でNOの場合）には、高温制御から低温制御に移行したのか（即ち、浴室暖房乾燥装置１９がオンからオフになった場合）、低温制御で運転開始したのか（即ち、初めから床暖房装置２０が単独運転した場合）によって処理が異なる（ステップＳ３１）。低温制御で運転開始した場合（ステップＳ３１でNOの場合）には、暖房温水供給装置は、ホットダッシュ制御を経た後、通常低温制御で運転される（ステップＳ３６）。例えば、図４のステップＳ５以下のような処理が実行され、ホットダッシュ制御終了直後の燃焼停止が防止される。
【００３９】
一方、浴室暖房乾燥装置１９がオフになって高温制御から低温制御に切り替わった場合（ステップＳ３１でYESの場合であって、このとき、遅延タイマの値Ｎは初期値に設定されている〔ステップＳ３〕）には、制御温度のみをただちに通常低温制御に移行させ、燃焼停止判定は所定時間遅延させてから通常低温制御に移行させる。
【００４０】
すなわち、当該実施形態では、高温制御から低温制御に移行すると（ステップＳ３１でYESの場合）、暖房温水供給装置は、戻り湯温センサ８の検知温度Ｔlが低温設定温度Ｓlとなるようにガスバーナ１を低温で燃焼制御する。ついで、遅延タイマの値がＮ＝０となってカウントアップしているか判定する（ステップＳ３２）。低温制御に移行した時点では、遅延タイマの値Ｎは初期値に設定されているから、図７のフローの処理サイクル毎に遅延タイマの値Ｎが１ずつカウントダウンされてゆく（ステップＳ３３）。この遅延期間中においては、戻り湯温センサ８の検知温度Ｔlは監視されていないので、低温側の検知温度Ｔlが上限温度Ｓl＋αを超えていても燃焼停止することはない。しかし、出湯温度センサ４で検知されている高温側の検知温度Ｔhが、余熱等によって上限温度Ｓh＋αを超えた場合には（ステップＳ２）、ガスバーナ１の燃焼は停止させられる（ステップＳ３、Ｓ４）。
【００４１】
低温制御開始後、所定時間が経過して遅延タイマの値がＮ＝０となってカウントアップすると（ステップＳ３２でYESの場合）、暖房温水供給装置は通常低温制御に完全に移行し、出湯温度センサ４の検知温度Ｔhがその上限温度Ｓh＋αを超えていないか（ステップＳ３４）、更に、戻り湯温センサ８の検知温度Ｔlがその上限温度Ｓl＋αを超えていないか（ステップＳ３５）を監視する。そして、出湯温度センサ４の検知温度Ｔhがその上限温度Ｓh＋αを超えるか（ステップＳ３４でYESの場合）、あるいは、戻り湯温センサ８の検知温度Ｔlがその上限温度Ｓl＋αを超えるか（ステップＳ３５でYESの場合）すると燃焼を停止する（ステップＳ３、Ｓ４）が、そうでない限り（ステップＳ３４及びＳ３５がいずれもNOの場合）通常低温制御を続ける。
【００４２】
よって、この実施形態による暖房温水供給装置によれば、暖房温水供給装置が高温制御の状態から低温制御の状態に移行した直後に燃焼が停止してしまい、床暖房装置２０の昇温が妨げられるといった不都合を避けることができる。
【００４３】
なお、この実施形態では、初めから低温制御する場合には、初めにホットダッシュ制御するようにしているが、このようなホットダッシュ制御の機能を持たない暖房温水供給装置にも当該実施形態は適用可能である。
【００４４】
【発明の効果】
本発明の暖房温水供給装置によれば、高温側の制御温度から低温側の制御温度へ切り換わった後、所定時間の間は、前記燃焼停止機能を動作させるための条件を設けているので、当該所定時間経過後に比べて所定時間の間は燃焼が停止しにくくなっている。従って、高温側の制御温度から低温側の制御温度に切り替わった直後で、高温側の制御温度で運転されていた時の高温水が配管内に残っている場合でも、燃焼停止が起こりにくくなる。特に、暖房用の燃焼利用機器の場合では、燃焼停止によって暖房が停止して室温等が却って低下する不都合を解消することができ、快適な暖房を行なうことができる。
【図面の簡単な説明】
【図１】暖房温水供給装置の構成と、該暖房温水供給装置における高温制御時の温水の流れを示す概略図である。
【図２】同上の暖房温水供給装置における低温制御時の温水の流れを示す概略図である。
【図３】低温制御時のホットダッシュ制御を説明する図である。
【図４】本発明の一実施形態にかかる暖房温水供給装置における、燃焼停止処理時の制御手順を表したフロー図である。
【図５】同上の暖房温水供給装置における、暖房燃焼開始（再開）処理時の制御手順を表したフロー図である。
【図６】本発明の別な実施形態にかかる暖房温水供給装置における、燃焼停止処理時の制御手順を表したフロー図である。
【図７】本発明のさらに別な実施形態にかかる暖房温水供給装置における、燃焼停止処理時の制御手順を表したフロー図である。
【符号の説明】
１ガスバーナ
２熱交換器
３高温水往き管
４出湯温度センサ
７暖房温水戻り管
８戻り湯温センサ
１０循環ポンプ
１１低温水往き管
１４高温水戻り管
１５低温水戻り管
１８バイパス管
１９浴室暖房乾燥装置
２０床暖房装置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heating and hot water supply device for supplying hot water to hot water using devices such as a bathroom heating and drying device, a floor heating device, and a fan heater.
[0002]
[Prior art]
(Configuration of heating and hot water supply device)
FIG. 1 is a schematic view showing a configuration of a heating / warm water supply device. Reference numeral 1 denotes a gas burner (combustor) for heating gas or hot water (heating medium for heating) flowing into the heat exchanger 2 by burning gas. One end of a hot water outlet pipe 3 is connected to the hot water outlet of the heat exchanger 2, and the hot water outlet pipe 3 has a hot water temperature sensor (for measuring the temperature of hot hot water heated by the heat exchanger 2). A thermistor) 4 and a high-temperature side thermal valve 5 for discharging or stopping hot water, and the other end of the high-temperature water discharge pipe 3 is a high-temperature water supply port 6.
[0003]
One end of a heating / warming water return pipe 7 is connected to the warm water inlet of the heat exchanger 2, and the return hot water temperature for measuring the temperature of the low temperature warm water returning to the warm water inlet of the heat exchanger 2 is connected to the heating / warming water return pipe 7. A sensor (thermistor) 8, an expansion tank 9 for absorbing fluctuations in the pipe pressure due to changes in hot water temperature, and a circulation pump 10 are provided. Further, a low temperature water outlet pipe 11 branches from a position downstream of the circulation pump 10 of the heating / warm water return pipe 7, and the low temperature water outlet pipe 11 is provided with a low temperature side thermal valve 12, and the low temperature water is supplied. The other end of the forward pipe 11 is a low-temperature water supply port 13. A hot water return pipe 14 and a low temperature water return pipe 15 are branched from the other end of the heating hot water return pipe 7, and a high temperature water recovery port 16 is provided at the end of the high temperature water return pipe 14. A low temperature water recovery port 17 is provided at the end of 15. In addition, a bypass pipe 18 is connected between a position upstream of the high temperature water moving valve 5 in the high temperature water discharge pipe 3 and a position upstream of the return hot water temperature sensor 8 in the heating hot water return pipe 7. ing.
[0004]
Thus, a hot water use device that requires relatively high temperature hot water is connected between the device connection port 6 and the high temperature water recovery port 16, and between the low temperature water supply port 13 and the low temperature water recovery port 17. Is connected to a hot water use device that requires relatively low temperature hot water. The types of these hot water use devices are not particularly limited. However, in the following explanation, as hot water use devices on the high temperature side, they are installed on the ceiling or wall of the bathroom and are used for heating the bathroom, ventilation, drying clothes, etc. A bathroom heating / drying apparatus capable of performing heating is connected between the equipment connection port 6 and the high temperature water recovery port 16, and floor heating is performed by connecting a plurality of floor heating panels as a low temperature side hot water utilization device. The operation of the conventional method will be described by taking the case where the apparatus is connected between the low-temperature water supply port 13 and the low-temperature water recovery port 17 as an example.
[0005]
(When operating a bathroom heater / dryer and floor heater)
When both the bathroom heating / drying device 19 and the floor heating device 20 are operated, the circulation pump 10 is started to operate, the high temperature side thermal valve 5 and the low temperature side thermal valve 12 are opened, and the heat exchanger 2 is operated. The gas burner 1 is subjected to combustion control (hereinafter referred to as high temperature control) so that the temperature of the hot water discharged from the hot water (detected temperature of the hot water temperature sensor 4) becomes a predetermined high temperature set temperature Sh (for example, about 80 ° C.). Circulate hot water through the route shown in. That is, the low temperature hot water that has entered the heat exchanger 2 from the heating hot water return pipe 7 is heated by the heat exchanger 2, and the high temperature hot water heated by the heat exchanger 2 is transferred from the heat exchanger 2 to the high temperature water discharge pipe 3. It is poured out into hot water. The hot water discharged from the heat exchanger 2 flows through the high-temperature water outlet pipe 3 and reaches the location where the bypass pipe 18 branches off, and then flows into the bypass pipe 18 and the bathroom heating / drying device 19 side.
[0006]
The hot water flowing into the bathroom heating / drying device 19 circulates in the bathroom heating / drying device 19 and exchanges heat with the air in the bathroom. The air heated by exchanging heat with warm water is blown into the bathroom as warm air, and used for heating in the bathroom. The hot water whose temperature has been lowered by exchanging heat with the air in the bathroom in this way flows into the heating hot water return pipe 7 via the high temperature water return pipe 14. On the other hand, the high-temperature water flowing into the bypass pipe 18 from the high-temperature water going-out pipe 3 passes through the bypass pipe 18 and flows into the heating / hot water return pipe 7 as it is. Furthermore, as will be described later, the low-temperature water flowing out from the floor heating device 20 also flows into the heating / hot water return pipe 7 via the low-temperature water recovery port 17. Therefore, the warm water returning to the heating / warming water return pipe 7 collects warm water that has passed through the bathroom heating / drying device 19 and the temperature has decreased, and has passed through the floor heating device 20 and has been recovered. The temperature of the hot water mixed by mixing the high temperature water from 18 is higher than the temperature of the recovered hot water and lower than the temperature of the high temperature water supplied from the bypass pipe 18. The mixed hot water (hereinafter sometimes referred to as low-temperature water) is sent through the heating / hot water return pipe 7 and reaches the branching position with the low-temperature water discharge pipe 11. It branches and flows to the 2nd side. The low-temperature water that has flowed to the low-temperature water discharge pipe 11 circulates in the floor heating panel of the floor heating device 20 to heat the floor heating panel, and then passes through the low-temperature water return pipe 15 and is heated as described above. Return to 7. On the other hand, the low-temperature water that has flowed to the heat exchanger 2 side is heated by the heat exchanger 2 and sent to the high-temperature water discharge pipe 3 as described above. As a result, hot water having a high temperature (for example, about 80 ° C.) is circulated through the bathroom heating / drying device 19, and hot water having a low temperature (for example, about 60 ° C.) is circulated through the floor heating device 20. .
[0007]
  (When the floor heater is operated alone)
  Next, the case where the bathroom heating / drying device 19 is stopped and the floor heating device 20 is operated alone will be described. In this case, the operation of the circulation pump 10 is started, the low temperature side thermal valve 12 is opened, and the temperature detected by the return hot water temperature sensor 8 becomes a predetermined low temperature set temperature Sl (for example, about 60 ° C.). The gas burner 1 is subjected to combustion control (hereinafter referred to as low temperature control), and hot water is circulated through a path as indicated by an arrow in FIG. That is, the low temperature hot water that has entered the heat exchanger 2 from the heating hot water return pipe 7 is heated by the heat exchanger 2, and the hot water heated by the heat exchanger 2 is discharged from the heat exchanger 2 to the high temperature water discharge pipe 3. Then, it flows into the bypass pipe 18 via the hot water outlet pipe 3 and further flows into the heating hot water return pipe 7. On the other hand, the hot water flowing out from the floor heating device 20 also flows into the heating / hot water return pipe 7 through the low-temperature water return pipe 15. Therefore, in the heating / hot water return pipe 7, the hot water that has passed through the floor heating device 20 and has fallen in temperature is mixed with the hot water supplied from the bypass pipe 18. The gas burner 1 is subjected to combustion control so that the temperature of the mixed hot water becomes the low temperature setting temperature Sl as described above. When the mixed hot water (low temperature water) reaches a branch position with the low temperature water outlet pipe 11, it branches and flows into the low temperature water outlet pipe 11 and the heat exchanger 2 side. The low-temperature water that has flowed to the low-temperature water discharge pipe 11 circulates in the floor heating panel of the floor heating device 20 to heat the floor heating panel, and then passes through the low-temperature water return pipe 15 and is heated as described above. Return to 7. On the other hand, the low-temperature water that has flowed to the heat exchanger 2 side is heated by the heat exchanger 2 and sent to the high-temperature water discharge pipe 3 as described above. As a result,Floor heating device 20In this case, low-temperature (for example, about 60 ° C.) hot water is circulated.
[0008]
However, when the floor heating device 20 is operated alone, the floor heating is performed at the start of the operation if the gas burner 1 is only subjected to combustion control so that the temperature detected by the return hot water temperature sensor 8 becomes a predetermined low temperature setting temperature Sl. It may take time for the device 20 to warm up, and the feeling of use may deteriorate. Therefore, in the heating / warm water supply device of the conventional system, as shown in FIG. 3, when the floor heating device 20 starts an independent operation, the detection temperature Th of the tapping temperature sensor 4 is a predetermined high temperature setting temperature for a predetermined time t. Combustion control of the gas burner 1 so as to be Sh (for example, about 80 ° C.) (hereinafter, this is referred to as hot dash control), and after a predetermined time t has elapsed, the detection temperature Tl of the return hot water temperature sensor 8 is a predetermined temperature. The gas burner 1 is combusted so as to reach the low temperature setting temperature Sl and normally controlled at a low temperature so that the temperature of the floor heating panel rises quickly.
[0009]
[Problems to be solved by the invention]
In the conventional heating / warm water supply device as described above, when the floor heating device 20 is steadily operated alone, that is, the detection temperature Tl of the return hot water temperature sensor 8 is controlled to be the low temperature setting temperature Sl. In this case, when the detected temperature Tl of the return hot water temperature sensor 8 exceeds the upper limit temperature Sl + α, the gas burner 1 is stopped burning, and when the detected temperature Tl of the returned hot water temperature sensor 8 falls below the lower limit temperature Sl−β, the gas burner 1 is turned on again. Combustion control is performed to ignite.
[0010]
Therefore, when the floor heating device 20 is operated alone as described above, high-temperature hot water flows into the piping such as the heating / warming water return pipe 7 immediately after the heating / hot water supply device is switched from the hot dash control to the normal low temperature control. Therefore, the detection temperature Tl of the return hot water temperature sensor 8 exceeds the upper limit temperature Sl + α, and therefore the gas burner 1 is extinguished when the hot dash control is switched to the normal low temperature control, and the detection temperature Tl of the return hot water temperature sensor 8 is The gas burner 1 sometimes did not burn until the temperature fell below the lower limit temperature Sl-β.
[0011]
As a result, while the temperature of the floor heating panel is quickly increased by hot dash control, the temperature increase of the floor heating panel is delayed by extinguishing the gas burner 1.
[0012]
Such a phenomenon is not limited to the case where the floor heating device 20 is operated alone to perform hot dash control. In the heating / warm water supply device that does not perform hot dash control, the floor heating device from the state in which the bathroom heating / drying device 19 and the floor heating device 20 are simultaneously operated (or the state in which the bathroom heating / drying device 19 is operated alone). Even in the case of switching to the 20 independent operation, the control temperature is switched from the high temperature set temperature Sh by the hot water temperature sensor 4 to the low temperature set temperature Sl by the hot water temperature sensor 8, and the same phenomenon occurs.
[0013]
The present invention has been made in view of the technical background as described above. The first object of the present invention is to provide a heating / warming water supply device having a function of hot dash control on the side using low-temperature warm water. This is to prevent the hot water supply device from being lowered due to fire extinguishing of the burner or the like when the hot water use device is switched from the hot dash control to the normal low temperature control.
[0014]
The second object of the present invention is to extinguish a burner when hot dash control does not work and the hot water use device on the side using high temperature hot water is switched from the operation state to the operation stop state. This is to prevent the hot water temperature from suddenly decreasing due to the above.
[0015]
DISCLOSURE OF THE INVENTION
  The heating and hot water supply device according to claim 1 of the present invention can switch the hot water supply temperature by burning the combustor at at least two control temperatures,By temperature sensorIn the heating and hot water supply device having a function of stopping the combustion of the combustor by detecting the hot water temperature at a predetermined location and comparing the detected temperature and the predetermined temperature,Control temperature from high temperature to low temperatureAfter switchingofDuring the predetermined timeWithout comparing the hot water temperature detected by the temperature sensor with the predetermined temperature, the combustion of the combustor is stopped when the hot water temperature detected by the temperature sensor exceeds the predetermined temperature after a predetermined time has elapsed. MakeIt is characterized by that.
[0016]
  The heating / warming water supply device of the present invention can switch the warm water supply temperature by burning a combustor at at least two control temperatures, and includes a plurality of floor heating devices, bathroom heating / drying devices, fan heaters, and the like. Hot water using equipment is connected to supply hot water to each equipment. As described in claim 1, when switching from the high temperature side control temperature to the low temperature side control temperature, the hot water use equipment (for example, bathroom heating and drying apparatus) that requires high temperature hot water seems to have been shut down. For example, even when operating a single hot water use device, hot water that is higher than the hot water temperature during normal operation may be supplied at the start of operation for rapid heating. In some cases, after hot water is temporarily supplied, the system returns to normal operation (for example, an operation method called hot dash control).The
[0017]
  According to the heating / warm water supply device of the present invention, after switching from the control temperature on the high temperature side to the control temperature on the low temperature side, for a predetermined time,Do not compare the hot water temperature detected by the temperature sensor with the specified temperatureTherefore, combustion is less likely to stop for a predetermined time than after the predetermined time has elapsed. Therefore, immediately after switching from the control temperature on the high temperature side to the control temperature on the low temperature side, even if the high temperature water remaining in the piping when operating at the control temperature on the high temperature side remains less likely to stop combustion, In the case of a combustion-use device for heating, it is possible to eliminate the inconvenience that the heating stops due to the combustion stop and the room temperature or the like decreases instead.
[0018]
  According to a third aspect of the present invention, there is provided a heating / hot water supply device capable of switching a hot water supply temperature by burning a combustor at at least two control temperatures, and detecting the hot water temperature at a predetermined location by a temperature sensor. In the heating and hot water supply device having a function of stopping the combustion of the combustor by comparing the temperature with a predetermined temperature,The predetermined temperature for stopping combustion used for a predetermined time after the control temperature is switched from the high temperature side to the low temperature side is larger than the predetermined temperature for stopping combustion used after the predetermined time has elapsed. I am doing so.
[0019]
  Claims of the invention2In the embodiment described inlow temperatureIt was installed in the place where hot water flowsLow temperature that is the temperature sensorSide temperature sensor,high temperatureIt was installed in the place where hot water flowshigh temperatureSide temperature sensor,Control temperature from high temperature side to low temperature sideAfter switchingofDuring the predetermined time, the combustion of the combustor is stopped when the temperature detected by the high temperature side temperature sensor exceeds the predetermined temperature, and the predetermined timeHas passedAfter that, at least one of the detection temperature of the high temperature side temperature sensor and the detection temperature of the low temperature side temperature sensor corresponds.eachCombustion of the combustor is stopped when a predetermined temperature is exceeded.
[0020]
  Claim2In this embodiment, the combustion is not stopped by the detection temperature of the low temperature side temperature sensor within a predetermined time, so that the low temperature side temperature sensor detects the high temperature water when the control temperature is switched from the high temperature side control temperature to the low temperature side control temperature. There is no fear of stopping the combustion. In addition, even within this predetermined time, the combustion of the combustor is stopped when the detected temperature of the high temperature side temperature sensor exceeds the predetermined temperature, so that boiling of the hot water in the pipe can be prevented, and the heating hot water The supply device can be operated safely.
[0021]
  Claims of the invention4In the embodiment described inlow temperatureIt was installed in the place where hot water flowsLow temperature that is the temperature sensorSide temperature sensor,high temperatureIt was installed in the place where hot water flowsHigh temperature sideA temperature sensor,Control temperature from high temperature side to low temperature sideAfter switchingAfter a predetermined time ofThe combustion of the combustor is stopped when the detected temperature of the high temperature side temperature sensor exceeds the first predetermined temperature or the detected temperature of the low temperature side temperature sensor exceeds the second predetermined temperature. The detected temperature of the high temperature side temperature sensor exceeds a predetermined temperature substantially equal to the first predetermined temperature, or the detected temperature of the low temperature side temperature sensor exceeds a predetermined temperature having a value greater than the second predetermined temperature. In this case, the combustion of the combustor is stopped.
[0022]
  Claim4In this embodiment, since the value of the predetermined temperature to be compared with the temperature detected by the low temperature side temperature sensor is increased within the predetermined time to make it difficult to stop the combustion, the control temperature is switched from the high temperature side control temperature to the low temperature side control temperature. At this time, the low temperature side temperature sensor detects the high temperature water, so that it becomes difficult to stop combustion. In addition, even within this predetermined time, the combustion of the combustor is stopped when the detected temperature of the high temperature side temperature sensor exceeds the predetermined temperature, so that boiling of the hot water in the pipe can be prevented, and the heating hot water The supply device can be operated safely.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Since the schematic configuration of the heating and hot water supply device and the circulation path of the hot water according to the present invention are the same as those shown in FIGS. 1 and 2, the redundant drawings are not shown and repeated in order to avoid redundancy. Embodiments of the present invention will be described with reference to the reference numerals used in FIGS.
[0024]
(First embodiment)
4 and 5 show an embodiment of the present invention. In the heating and hot water supply apparatus having the hot dash control function having the configuration as shown in FIGS. 1 and 2, respectively, a control unit (microprocessor and Each control procedure of the heating combustion stop process and the heating combustion start (restart) process executed by the memory) is shown. First, a process (combustion stop process) from when the heating / warm water supply device starts combustion operation until it detects that the warm water temperature has risen excessively and temporarily stops the combustion of the gas burner 1 will be described. When the heating / hot water supply device starts a combustion operation, first, the bathroom heating / drying device 19 is turned on and the high-temperature control as shown in FIG. 1 is performed, or the bathroom heating / drying device 19 is turned off and as shown in FIG. The process branches depending on whether the low temperature control is performed or which control is performed (step S1).
[0025]
When the heating / warm water supply device performs high temperature control as shown in FIG. 1 (YES in step S1), the gas burner 1 has a detection temperature Th detected by the tapping temperature sensor 4 as a high temperature set temperature Sh (for example, about 80 ° C.). Combustion control is performed so that the detected temperature Th of the hot water temperature sensor 4 is monitored whether it exceeds the upper limit temperature Sh + α (for example, α = 7 ° C.) (step S2). When the detected temperature Th of the hot water temperature sensor 4 exceeds the upper limit temperature Sh + α, the delay timer is reset to the initial value (step S3), and then the combustion of the gas burner 1 is stopped (step S4).
[0026]
When the heating / warm water supply device performs low temperature control as shown in FIG. 2 (NO in step S2), hot dash control is performed for a predetermined time t from the start of operation of the heating / warm water supply device. Here, the hot dash control is to control the detection temperature Th of the hot water temperature sensor 4 to be the high temperature set temperature Sh while circulating the hot water through a route as shown in FIG. If the heating / hot water supply device is still performing hot dash control within the predetermined time t after the start of the low temperature control (YES in step S5), the hot water is circulated through the floor heating device 20. Therefore, the temperature of the floor heating panel is rapidly increased. During hot dash control, the value N of the delay timer is set to an initial value (for example, N = 100) (step S6), so the delay timer is held at the initial value. During this hot dash control, it is monitored whether or not the detected temperature Th of the tapping temperature sensor 4 exceeds the upper limit temperature Sh + α (step S2), and if the detected temperature of the tapping temperature sensor 4 exceeds the upper limit temperature Sh + α, After the delay timer is reset to the initial value (step S3), the combustion of the gas burner 1 is stopped (step S4).
[0027]
After the start of the hot dash control, when the predetermined time t has elapsed, the hot dash control ends. In the conventional system, immediately after the hot dash control is completed, the control temperature and the combustion stop determination are shifted to the normal low temperature control, and the combustion control is performed so that the detected temperature Tl by the return hot water temperature sensor 8 becomes the low temperature set temperature Sl. The combustion is stopped when the detected temperature Tl of the return hot water temperature sensor 8 exceeds the upper limit temperature Tl + α. On the other hand, in the embodiment described here, as will be described next, when the hot dash control is finished, only the control temperature is immediately shifted to the normal low temperature control, and the combustion stop determination is delayed for a predetermined time. Usually, it is shifted to low temperature control.
[0028]
That is, in this embodiment, when the hot dash control is finished (NO in step S5), the heating / hot water supply device lowers the gas burner 1 so that the detected temperature Tl of the return hot water temperature sensor 8 becomes the low temperature set temperature Sl. To control combustion. Next, it is determined whether the delay timer value is N = 0 and the count is up (step S7). Since the delay timer value N is set to the initial value when the hot dash control is completed, the delay timer value N is counted down (decremented) by 1 for each processing cycle of the flow of FIG. S8). During this delay period, the detected temperature Tl of the return hot water temperature sensor 8 is not monitored, so even if the detected temperature Tl on the low temperature side exceeds the upper limit temperature Sl + α, the combustion is not stopped as in the conventional method. However, when the detected temperature Th on the high temperature side detected by the tapping temperature sensor 4 exceeds the upper limit temperature Sh + α due to residual heat or the like (step S2), the combustion of the gas burner 1 is stopped (steps S3 and S4). .
[0029]
When the predetermined time has elapsed after the hot dash control is over and the delay timer value is N = 0 and counting up (in the case of YES in step S7), the heating / hot water supply device is completely shifted to normal low temperature control, Whether the detected temperature Th of the temperature sensor 4 does not exceed the upper limit temperature Sh + α (step S9), and further, whether the detected temperature Tl of the return hot water temperature sensor 8 exceeds the upper limit temperature Sl + α (step S10) is monitored. . Then, whether the detected temperature Th of the hot water temperature sensor 4 exceeds the upper limit temperature Sh + α (in the case of YES in step S9), or whether the detected temperature Tl of the return hot water temperature sensor 8 exceeds the upper limit temperature Sl + α (in step S10). If YES, combustion is stopped (steps S3 and S4), but unless otherwise (both steps S9 and S10 are NO), normal low temperature control is continued.
[0030]
Therefore, according to the heating / warm water supply device according to this embodiment, it is possible to avoid the inconvenience that combustion is stopped at the end of hot dash control and the temperature rise of the floor heating device 20 is hindered. Moreover, since the temperature detected by the hot water temperature sensor 4 on the high temperature side is monitored for a predetermined time after the end of the hot dash control and the upper limit temperature Sh + α is exceeded, the combustion is stopped. Boiling can be prevented, and comfortable heating control can be performed without sacrificing safety.
[0031]
Next, a process until the combustion of the gas burner 1 is restarted after the heating / hot water supply device stops burning will be described with reference to FIG. When the heating / warm water supply device is controlled at a high temperature (YES in step S11), the gas burner is detected when the detected temperature Th of the tapping temperature sensor 4 falls below the lower limit temperature Sh-β (for example, β = 7 ° C.). 1 combustion is started (steps S12 and S13). Further, even when the heating / hot water supply device is under low temperature control and during hot dash control (YES in step S14), the detected temperature Th of the tapping temperature sensor 4 is the lower limit temperature Sh−β (for example, β = 7 ° C.). When it falls below, combustion of the gas burner 1 is started (steps S12 and S13). On the other hand, when the period of the hot dash control is ended during the low temperature control, the combustion of the gas burner 1 is started when the detected temperature Tl of the return hot water temperature sensor 8 falls below the lower limit temperature Sl-β.
[0032]
(Second Embodiment)
FIG. 6 is a flowchart showing a processing procedure when combustion is stopped in a heating / hot water supply device according to another embodiment of the present invention. Also in this embodiment, the processing after the delay time after hot dash control has elapsed during high temperature control, during low temperature control, during hot dash control, or during low temperature control is the same as in the case of the first embodiment. (Steps S1 to S7, S9 to S10). However, before the delay time immediately after the end of the hot dash control during the low temperature control, in this embodiment, the detected temperature Th of the tapping temperature sensor 4 does not exceed the upper limit temperature Sh + α (step S21), It is monitored whether the detection temperature Tl of the return hot water temperature sensor 8 exceeds the upper limit temperature Sl + γ (here, γ >> α) (step S22). Whether the detected temperature Th of the hot water temperature sensor 4 exceeds the upper limit temperature Sh + α (in the case of YES in step S21), or whether the detected temperature Tl of the return hot water temperature sensor 8 exceeds the upper limit temperature Sl + γ (in step S22). If YES, combustion is stopped (steps S3 and S4).
[0033]
In this embodiment, even after the delay time after the step dash control has elapsed (in the case of YES at step S7), whether or not the detected temperature Th of the tapping temperature sensor 4 exceeds the upper limit temperature Sh + α (step S9), Then, it is monitored whether or not the detected temperature Tl of the return hot water temperature sensor 8 exceeds the upper limit temperature Sl + α (step S10). Then, whether the detected temperature Th of the hot water temperature sensor 4 exceeds the upper limit temperature Sh + α (in the case of YES in step S9), or whether the detected temperature Tl of the return hot water temperature sensor 8 exceeds the upper limit temperature Sl + α (in step S10). If YES, combustion is stopped (steps S3 and S4).
[0034]
In this embodiment, before the lapse of the delay time after the hot dash control as described above, the upper limit temperature S1 + γ for stopping the combustion is sufficiently higher than the upper limit temperature S1 + α for stopping the combustion after the lapse of the delay time. Since the high value is set, the hot water remaining in the pipe immediately after the end of the hot dash control is returned and the hot water temperature sensor 8 detects the hot water so that it is difficult to stop the combustion.
[0035]
(Third embodiment)
FIG. 7 is a flowchart showing a processing procedure when combustion is stopped in a heating / hot water supply device according to still another embodiment of the present invention. In this embodiment, when the control is shifted from the high temperature control to the low temperature control, the hot dash control is not performed in the low temperature control, and in that case, the hot water remaining in the pipe is returned and the hot water temperature sensor 8 detects the hot water. Thus, it is possible to prevent the inconvenience that the gas burner 1 is stopped from burning.
[0036]
In this embodiment, after the heating / warm water supply device starts the combustion operation, a process (combustion stop process) until it is detected that the warm water temperature has risen excessively and the combustion of the gas burner 1 is temporarily stopped will be described. . When the heating / hot water supply device starts a combustion operation, first, the bathroom heating / drying device 19 is turned on and the high-temperature control as shown in FIG. 1 is performed, or the bathroom heating / drying device 19 is turned off and as shown in FIG. The process branches depending on whether the low temperature control is performed or which control is performed (step S1).
[0037]
When the heating / warm water supply device performs high temperature control as shown in FIG. 1 (YES in step S1), the gas burner 1 has a detection temperature Th detected by the tapping temperature sensor 4 as a high temperature set temperature Sh (for example, about 80 ° C.). Combustion control is performed so as to monitor whether the detected temperature Th of the tapping temperature sensor 4 exceeds the upper limit temperature Sh + α (for example, α = 7 ° C.) (step S2). When the detected temperature Th of the hot water temperature sensor 4 exceeds the upper limit temperature Sh + α, the delay timer is reset to the initial value (step S3), and then the combustion of the gas burner 1 is stopped (step S4).
[0038]
When the heating / warm water supply device performs the low temperature control as shown in FIG. 2 (in the case of NO in step S2), has the transition from the high temperature control to the low temperature control (ie, the bathroom heating / drying device 19 is switched from on to off)? The process differs depending on whether the operation is started with the low temperature control (that is, when the floor heating device 20 is operated independently from the beginning) (step S31). When the operation is started with the low temperature control (NO in step S31), the heating / warm water supply device is operated with the normal low temperature control after the hot dash control (step S36). For example, a process such as step S5 and subsequent steps in FIG. 4 is executed, and the combustion stop immediately after the hot dash control ends is prevented.
[0039]
On the other hand, when the bathroom heating / drying device 19 is turned off and switched from the high temperature control to the low temperature control (YES in step S31, at this time, the value N of the delay timer is set to the initial value [step In S3]), only the control temperature is immediately shifted to the normal low-temperature control, and the combustion stop determination is delayed for a predetermined time and then shifted to the normal low-temperature control.
[0040]
In other words, in the present embodiment, when the high temperature control is shifted to the low temperature control (YES in step S31), the heating / hot water supply device is configured so that the detected temperature Tl of the return hot water temperature sensor 8 becomes the low temperature set temperature Sl. Is controlled at low temperature. Next, it is determined whether the delay timer value is N = 0 and the count is up (step S32). Since the delay timer value N is set to the initial value at the time of shifting to the low temperature control, the delay timer value N is counted down by 1 for each processing cycle of the flow of FIG. 7 (step S33). During this delay period, the detected temperature Tl of the return hot water temperature sensor 8 is not monitored, so that the combustion is not stopped even if the detected temperature Tl on the low temperature side exceeds the upper limit temperature Sl + α. However, when the detected temperature Th on the high temperature side detected by the tapping temperature sensor 4 exceeds the upper limit temperature Sh + α due to residual heat or the like (step S2), the combustion of the gas burner 1 is stopped (steps S3 and S4). .
[0041]
When a predetermined time has elapsed after the start of the low temperature control and the value of the delay timer is N = 0 and the counter is counted up (in the case of YES in step S32), the heating / hot water supply device normally shifts completely to the low temperature control and the hot water temperature It is monitored whether the detected temperature Th of the sensor 4 does not exceed the upper limit temperature Sh + α (step S34), and further whether the detected temperature Tl of the return hot water temperature sensor 8 exceeds the upper limit temperature Sl + α (step S35). Whether the detected temperature Th of the hot water temperature sensor 4 exceeds the upper limit temperature Sh + α (in the case of YES in step S34), or whether the detected temperature Tl of the return hot water temperature sensor 8 exceeds the upper limit temperature Sl + α (in step S35). When YES, combustion is stopped (steps S3 and S4), but unless otherwise (when both steps S34 and S35 are NO), normal low temperature control is continued.
[0042]
Therefore, according to the heating / warm water supply device according to this embodiment, combustion stops immediately after the heating / warm water supply device shifts from the high temperature control state to the low temperature control state, and the temperature increase of the floor heating device 20 is hindered. Such inconveniences can be avoided.
[0043]
In this embodiment, when the low temperature control is performed from the beginning, the hot dash control is performed first. However, the embodiment is also applied to a heating / hot water supply apparatus that does not have such a hot dash control function. Is possible.
[0044]
【The invention's effect】
According to the heating / warm water supply device of the present invention, after switching from the control temperature on the high temperature side to the control temperature on the low temperature side, a condition for operating the combustion stop function is provided for a predetermined time period. Combustion is less likely to stop for a predetermined time than after the predetermined time has elapsed. Therefore, immediately after switching from the control temperature on the high temperature side to the control temperature on the low temperature side, even if the high temperature water remaining in the pipe is operating at the control temperature on the high temperature side, combustion is less likely to stop. In particular, in the case of a combustion-use device for heating, it is possible to eliminate the inconvenience that the heating stops due to the combustion stop and the room temperature or the like decreases, and comfortable heating can be performed.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a configuration of a heating / warming water supply device and a flow of warm water during high-temperature control in the heating / warming water supply device.
FIG. 2 is a schematic diagram showing the flow of hot water during low-temperature control in the heating and hot water supply apparatus same as above.
FIG. 3 is a diagram illustrating hot dash control during low temperature control.
FIG. 4 is a flowchart showing a control procedure during combustion stop processing in the heating / hot water supply device according to the embodiment of the present invention.
FIG. 5 is a flowchart showing a control procedure at the time of heating combustion start (restart) processing in the heating / warm water supply apparatus same as above.
FIG. 6 is a flowchart showing a control procedure at the time of combustion stop processing in a heating and hot water supply apparatus according to another embodiment of the present invention.
FIG. 7 is a flowchart showing a control procedure during a combustion stop process in a heating / hot water supply device according to still another embodiment of the present invention.
[Explanation of symbols]
1 Gas burner
2 Heat exchanger
3 Hot water outlet pipe
4 Hot water temperature sensor
7 Heating hot water return pipe
8 Return hot water temperature sensor
10 Circulation pump
11 Low temperature water pipe
14 Hot water return pipe
15 Low temperature water return pipe
18 Bypass pipe
19 Bathroom heating / drying equipment
20 Floor heating system

Claims

The combustor is combusted at at least two control temperatures to switch the hot water supply temperature, and the temperature of the combustor is detected by detecting the hot water temperature at a predetermined location and comparing the detected temperature with the predetermined temperature. In the heating and hot water supply device with the function of stopping
During the predetermined time after the control temperature is switched from the high temperature side to the low temperature side, the hot water temperature detected by the temperature sensor is not compared with the predetermined temperature, and after the predetermined time has elapsed, the temperature sensor sensed the hot water temperature is the predetermined temperature warm humor hot water supply apparatus you characterized by stopping the combustion of the combustor when exceeded.

A low temperature side temperature sensor, which is the temperature sensor installed at a location where low temperature hot water flows, and a high temperature side temperature sensor installed at a location where high temperature hot water flows,
During a predetermined time after the control temperature is switched from the high temperature side to the low temperature side, the combustion of the combustor is stopped when the detection temperature of the high temperature side temperature sensor exceeds the predetermined temperature,
After said predetermined time has elapsed, at least one of the detected temperature of the temperature detected by the detected temperature and the low temperature-side temperature sensor of the high-temperature side temperature sensor, corresponding stop combustion of the combustor when it exceeds a respective predetermined temperature The heating / hot water supply device according to claim 1, wherein the heating / warm water supply device is provided.

The combustor is combusted at at least two control temperatures to switch the hot water supply temperature, and the temperature of the combustor is detected by detecting the hot water temperature at a predetermined location and comparing the detected temperature with the predetermined temperature. In the heating and hot water supply device with the function of stopping
The predetermined temperature for stopping the combustion used in a predetermined time after the control temperature is switched from the high temperature side to the low temperature side is a value larger than the predetermined temperature for stopping the combustion used after the predetermined time has elapsed. warm tufts hot water supply apparatus you wherein a.

A low temperature side temperature sensor, which is the temperature sensor installed at a location where low temperature hot water flows, and a high temperature side temperature sensor installed at a location where high temperature hot water flows,
After a predetermined time after the control temperature is switched from the high temperature side to the low temperature side, the detection temperature of the high temperature side temperature sensor exceeds the first predetermined temperature, or the detection temperature of the low temperature side temperature sensor is the second predetermined temperature. If the temperature is exceeded, the combustion of the combustor is stopped,
During the predetermined time, the detected temperature of the high temperature side temperature sensor exceeds a predetermined temperature substantially equal to the first predetermined temperature, or the detected temperature of the low temperature side temperature sensor has a value higher than the second predetermined temperature. The heating / hot water supply device according to claim 3 , wherein combustion of the combustor is stopped when the temperature exceeds.

A heat exchanger that heats water that passes through the heat of the combustor, and hot water using equipment that is supplied with hot water heated by the heat exchanger,
When the hot water utilization device starts operation, the combustor is controlled at the control temperature on the high temperature side for the predetermined time, and after the predetermined time has elapsed, the combustor is controlled at the control temperature on the low temperature side. The heating / warm water supply device according to claim 2, wherein the heating / warm water supply device is controlled.

A heat exchanger that heats water passing by the heat of the combustor, a high-temperature hot water use device that is supplied with high-temperature hot water heated by the heat exchanger, and a high-temperature hot water heated by the heat exchanger. With low-temperature hot water equipment that is supplied with low-temperature hot water hydrated in hot water,
When the high temperature hot water use device is operated, the combustor is controlled at a control temperature on the high temperature side, the high temperature hot water use device is not operated, and the low temperature hot water is operated. When the user equipment starts operation, the combustor is controlled at the control temperature on the high temperature side for the predetermined time, and the combustor is controlled at the control temperature on the low temperature side after the predetermined time has elapsed. In the heating / warm water supply device according to claim 2 or 4,
When the low-temperature hot water use device starts operation when the high-temperature hot water use device that was being operated is stopped, the combustor is immediately controlled at the low-temperature control temperature. Heating hot water supply device.