JP3859846B2

JP3859846B2 - One can two water heater

Info

Publication number: JP3859846B2
Application number: JP32381497A
Authority: JP
Inventors: 節義田畑; 寿久斉藤; 徹哉佐藤
Original assignee: 株式会社ガスター
Priority date: 1997-11-10
Filing date: 1997-11-10
Publication date: 2006-12-20
Anticipated expiration: 2017-11-10
Also published as: JPH11141980A

Description

【０００１】
【発明の属する技術分野】
本発明は、給湯熱交換器と追い焚き熱交換器等の非給湯側熱交換器が一体化され、その一体化した熱交換器を共通のバーナーで加熱する一缶二水路給湯器に関するものである。
【０００２】
【従来の技術】
図３には本出願人らが開発している一缶二水路給湯器の一例である一缶二水路風呂給湯器のシステム構成例が示されている。同図において、この一缶二水路風呂給湯器（器具）は燃焼室１を有し、この燃焼室１にはバーナー２が配設され、このバーナー２の上方には給湯熱交換器３と非給湯側熱交換器としての追い焚き熱交換器４が設けられている。これら給湯熱交換器３と追い焚き熱交換器４は一体化されて配設されている。すなわち、複数の共通のフィンプレート５に給湯側の管路を貫通装着して給湯熱交換器３と成し、同じくフィンプレート５に追い焚き側の管路を貫通装着して追い焚き熱交換器４と成しており、上記バーナー２は給湯熱交換器３と追い焚き熱交換器４を共に加熱する構成になっている。
【０００３】
上記バーナー２の下方側の燃焼室１は給気通路６に連通され、この給気通路６には燃焼ファン７が組み込まれており、燃焼ファン７の回転駆動により外部から給気通路６を介してバーナー２へ空気が送り込まれると共に、バーナー２の燃焼により生じた排気ガスがバーナー２の上方の燃焼室１に連通する排気通路９から外部へ排出される。
【０００４】
上記バーナー２のガス導入口にはガスノズル１９が対向配設され、このガスノズル１９には燃料ガスを導入するためのガス供給通路８が接続されており、このガス供給通路８により導かれた燃料ガスはガスノズル１９を介してバーナー２に供給される。また、上記ガス供給通路８には通路の開閉を行う電磁弁１０，１１ａ，１１ｂと、ガスの供給量を開弁量により制御する比例弁１２とが介設されている。
【０００５】
前記給湯熱交換器３の入側には給水通路１３の一端側が接続され、給湯熱交換器３の出側には給湯通路１４の一端側が接続されており、上記給水通路１３の他端側は外部配管を介して水供給源に接続され、前記給湯通路１４の他端側は外部配管を介して台所等の所望の給湯場所に導かれている。また、上記給湯熱交換器３の入側の給水通路１３と出側の給湯通路１４を短絡するバイパス通路１５が設けられており、上記バイパス通路１５には通路の開閉を行うバイパス弁１６が介設されている。
【０００６】
前記追い焚き熱交換器４の入側には管路１８の一端側が接続され、この管路１８の他端側は循環ポンプ２０の吐出口に接続されており、循環ポンプ２０の吸入口には戻り管２１の一端側が接続され、戻り管２１の他端側は浴槽２２に連接されている。また、追い焚き熱交換器４の出側には管路２３の一端側が接続されており、この管路２３の他端側は前記浴槽２２に連接されている。上記戻り管２１と循環ポンプ２０と管路１８と追い焚き熱交換器４と管路２３により非給湯側循環通路としての追い焚き循環通路２４が構成される。
【０００７】
上記追い焚き循環通路２４の管路１８と前記給湯通路１４は湯張り通路２５により連通されており、この湯張り通路２５には通路の開閉を制御する注湯制御弁２６と、浴槽２２の水位を検出する水位センサ２８とが設けられている。
【０００８】
なお、図中に示す３０は燃焼室１内の風量を検出する風量センサであり、３１は給水通路１３に設けられて給水の流量を検出する水量センサであり、３２は給水通路１３の水の温度を検出する入水温度センサであり、３４は給湯通路１４に設けられて通水流量を制御する流量制御弁であり、３５は給湯通路１４に設けられて給湯が行われていることを水流により検出する給湯確認スイッチであり、３６は追い焚き循環通路２４の水流の有無を検出する流水スイッチであり、３７は追い焚き循環通路２４の湯水温を浴槽湯水の温度（風呂温度）として検出する風呂温度センサであり、３８は給湯熱交換器３で作り出された湯の温度を検出する出湯温度センサである。
【０００９】
この一缶二水路風呂給湯器には制御装置４０が設けられており、この制御装置４０にはリモコン４１が接続されている。このリモコン４１には給湯温度を設定するための給湯温度設定手段や、浴槽２２の風呂の温度を設定する風呂温度設定手段や、浴槽２２の湯水の水位を設定する風呂水位設定手段等が設けられている。
【００１０】
上記制御装置４０は各種センサのセンサ出力信号やリモコン４１の情報を取り込み、それら情報と予め与えられているシーケンスプログラムに従って、給湯運転や、湯張り運転や、追い焚き運転等の各種の器具運転の動作を次のように制御する。
【００１１】
例えば、台所等に導かれた給湯通路の水栓が開けられ、水供給源から給水通路１３に水が流れ込んで水量センサ３１が給水通路１３の通水を検出すると、器具は給湯運転を開始する。まず、燃焼ファン７の回転駆動を開始させ、電磁弁１１ａ，１１ｂの両方又はどちらか一方と電磁弁１０を開動作させガス供給通路８を通してバーナー２に燃料ガスを供給し、図示されていない点着火手段によりバーナー２の点着火を行い燃焼を開始させる。
【００１２】
そして、給湯湯温が前記給湯温度設定手段に設定されている給湯設定温度となるように比例弁１２の開弁量を制御して（バーナー２への供給ガス量を制御して）バーナー２の燃焼能力を制御し、給湯熱交換器３の通水をバーナー２の燃焼火炎により加熱して設定温度の湯を作り出し、この湯を給湯通路１４を通して給湯場所に供給する。
【００１３】
湯の使用が終了して水栓が閉められると、給湯熱交換器３への通水が停止し、水量センサ３１が給水通路１３の通水を検知しなくなったときに、電磁弁１０を閉じてバーナー２の燃焼を停止させる。その後、予め定められたポストパージ期間（例えば、５分間）が経過したときに、燃焼ファン７の回転駆動を停止して給湯運転を終了し次の給湯に備える。
【００１４】
湯張り運転を行うときには、例えば、注湯制御弁２６を開弁し、この注湯制御弁２６の開弁動作により水供給源から給水通路１３に水が流れ込んで水量センサ３１が給水通路１３の通水を検知すると、上記給湯運転と同様にバーナー２の燃焼を開始させる。
【００１５】
このバーナー２の燃焼火炎により給湯熱交換器３で作り出された湯は給湯通路１４と湯張り通路２５を順に介して追い焚き循環通路２４に送り込まれ、追い焚き循環通路２４に流れ込んだ湯は戻り管２１を通る経路と追い焚き熱交換器４を通る経路との２経路で浴槽２２に落とし込まれる。そして、水位センサ２８が検出する浴槽２２の水位がリモコン４１に設定されている設定水位に達したときに、注湯制御弁２６を閉じ、電磁弁１０を閉じてバーナー２の燃焼を停止させ、湯張り運転を終了する。
【００１６】
追い焚き運転を行うときには、循環ポンプ２０を駆動させて熱媒体としての浴槽２２内の湯水を追い焚き循環通路２４を通して循環させ、流水スイッチ３６によって追い焚き循環通路２４の湯水の流れを検知した後、バーナー２の燃焼を開始させる。そして、バーナー２の燃焼火炎により追い焚き熱交換器４の循環湯水を加熱して追い焚きを行い、風呂温度センサ３７により検出される風呂温度が前記風呂温度設定手段により設定されている設定温度に達したときに、バーナー２の燃焼を停止させ、追い焚き運転を終了する。
【００１７】
前記の如く、一缶二水路風呂給湯器は、一体化された給湯熱交換器３と追い焚き熱交換器４を共通のバーナー２を用いて加熱する方式であるので、別体に設けられた給湯熱交換器と追い焚き熱交換器をそれぞれ別個のバーナーを用いて燃焼加熱する方式に比べて、装置構成の簡易化が図れ、これに伴い、装置の小型化とコストの低減が図れることになる。
【００１８】
また、図４には、一缶二水路給湯器としての給湯暖房機の一例が示されており、同図において、図３の一缶二水路風呂給湯器と同一名称部分には同一符号が付してある。また、図中、５７は非給湯側熱交換器としての暖房用熱交換器を示しており、５２は暖房オン・オフバルブ、５３は放熱器、５４はファン、５５はシスターンタンク、５６はバイパス通路をそれぞれ示している。暖房用循環通路５１を循環する熱媒体としては、例えば、エチレングリコールとプロピレングリコールに水を加えたものが用いられる。
【００１９】
【発明が解決しようとする課題】
ところで、上記のような一缶二水路風呂給湯器において、給湯熱交換器３内に水がないにも拘わらず、給湯が行われず追い焚きのみを行う追い焚き単独運転が行われると、給湯熱交換器３が空焚きとなって危険であるため、例えば、特許公報第２５９２４０６号には、給湯用の通水配管に通水センサを設けて通水配管内に通水があったか否かを判断し、通水があったときには通水来歴メモリに通水有りのデータを書き込み、このデータが書き込まれていなかったときには追い焚き単独運転を禁止する装置の提案がなされている。
【００２０】
しかしながら、給湯器の設置時などには通水が行われていないために、このような装置を一缶二水路風呂給湯器に設けることにより、上記給湯熱交換器３の空焚きを防止することはできるが、例えば、給湯熱交換器３の凍結防止などのために、通水配管内の通水確認後に水抜きが行われた場合などは、この装置の前記通水来歴メモリに通水有りのデータがあるために、追い焚き単独運転は禁止されず、したがって、給湯熱交換器３の空焚きが生じてしまうといった問題があった。なお、このような問題は、一缶二水路風呂給湯器のみならず、図４に示した給湯暖房機のような、一缶二水路給湯器においても生じるものであった。
【００２１】
本発明は上記課題を解決するためになされたものであり、その目的は、例えば一缶二水路風呂給湯器等の一缶二水路給湯器の設置以降に給湯熱交換器内の水抜きが行われた場合にも給湯熱交換器の空焚きを防止することができる一缶二水路給湯器を提供することにある。
【００２４】
【課題を解決するための手段】
上記目的を達成するために、本発明は次のような構成をもって課題を解決するための手段としている。すなわち、本第１の発明は、給水通路から導かれた水を加熱し給湯通路に湯を供給する給湯熱交換器と、非給湯側循環通路に組み込まれ該非給湯側循環通路を循環する熱媒体を加熱する非給湯側熱交換器とを有し、上記給湯熱交換器と非給湯側熱交換器は一体化され、上記給湯熱交換器と非給湯側熱交換器を共通に加熱するバーナーが設けられている一缶二水路給湯器において、給湯熱交換器内の湯の温度を検出する給湯熱交換器湯温検出手段を設け、給湯が行われず非給湯側の運転のみを行う非給湯側単独運転中に上記給湯熱交換器湯温検出手段により検出される検出温度がバーナー燃焼を停止させる設定温度以上になったときにはバーナーの燃焼を停止させ、上記給湯熱交換器湯温検出手段の検出温度がバーナー燃焼を再開させる設定温度以下になったときにはバーナーの燃焼を再開させる非給湯側単独運転燃焼制御部を有し、該非給湯側単独運転燃焼制御部によるバーナーの燃焼と燃焼停止に伴い給湯熱交換器内に湯がある状態時における当該給湯熱交換器の経時的な湯温変化のパターンが上記給湯熱交換器湯温検出手段の設置位置に対応した基準データとして与えられており、非給湯側単独運転中に上記給湯熱交換器湯温検出手段によって検出される検出温度データの経時的変化が上記基準データの対応する湯温変化パターンと比較して不規則に変化するときには給湯熱交換器内に水がないことを検知する給湯熱交水なし検知手段が設けられている構成をもって課題を解決するための手段としている。
【００２５】
さらに、本第２の発明は、給水通路から導かれた水を加熱し給湯通路に湯を供給する給湯熱交換器と、非給湯側循環通路に組み込まれ該非給湯側循環通路を循環する熱媒体を加熱する非給湯側熱交換器とを有し、上記給湯熱交換器と非給湯側熱交換器は一体化され、上記給湯熱交換器と非給湯側熱交換器を共通に加熱するバーナーが設けられている一缶二水路給湯器において、給湯熱交換器内の湯の温度を検出する給湯熱交換器湯温検出手段を設け、給湯が行われず非給湯側の運転のみを行う非給湯側単独運転中に上記給湯熱交換器湯温検出手段により検出される検出温度がオフ温度以上になったときにはバーナーの燃焼を停止させ、上記給湯熱交換器湯温検出手段の検出温度がバーナー燃焼を再開させる設定温度以下になったときにはバーナーの燃焼を再開させる非給湯側単独運転燃焼制御部を有し、非給湯側単独運転中に上記給湯熱交換器湯温検出手段によって検出される検出温度が上記バーナー燃焼を停止させるオフ温度よりも高い温度となるところの上記給湯熱交換器内に湯があるときの給湯熱交換器内湯温のピーク温度よりもさらに高い予め定められた基準温度に達したときには上記給湯熱交換器内に水がないことを検知する給湯熱交水なし検知手段が設けられている構成をもって課題を解決するための手段としている。
【００２６】
さらに、本第３の発明は、上記本第１又は第２の発明の構成に加えて、給湯熱交水なし検知手段により給湯熱交換器内に水がないことが検知されたときには非給湯側運転を強制的に停止させる非給湯側強制停止手段が設けられている構成をもって課題を解決するための手段としている。
【００２７】
さらに、本第４の発明は、上記本第１の発明乃至第３の発明のいずれか１つの構成に加え、給湯熱交水なし検知手段により給湯熱交換器内に水がないことが検知されたときには非給湯側運転の異常を報知する非給湯側運転異常報知手段が設けられている構成をもって課題を解決するための手段としている。
【００２８】
さらに、非給湯側運転指示が与えられたときに上記非給湯側循環通路に設けられた循環ポンプを駆動させるとともに上記非給湯側循環通路の湯水の流れを検知せずにバーナー燃焼運転を直ちに開始させる非給湯側燃焼強制開始手段が設けられていることも上記本第１の発明から第４の発明の特徴的な構成とされている。
【００２９】
さらに、上記非給湯側循環通路は追い焚き循環通路とし、非給湯側熱交換器は追い焚き熱交換器とし、上記追い焚き循環通路を循環する熱媒体は湯水とし、非給湯側の運転は風呂の追い焚き運転としたことも上記本第１の発明から第５の発明の特徴的な構成とされている。
【００３２】
以上のように、本発明においては、非給湯側単独運転中に検出される給湯熱交換器湯温検出手段の検出温度に基づいて給湯熱交換器内に水がないことを検知するため、たとえ給湯器の設置以降に給湯熱交換器内の水抜きが行われたとしても、給湯熱交換器内に水がないことを正確に検知することができ、それにより、給湯熱交換器側の空焚きを防止することが可能となり、上記課題が解決される。
【００３３】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。なお、本実施形態例の一缶二水路給湯器は一缶二水路風呂給湯器であり、本実施形態例の説明において、提案例の一缶二水路風呂給湯器と同一名称部分には同一符号を付し、その重複説明は省略する。
【００３４】
本実施形態例の一缶二水路風呂給湯器は、図３に示した提案例の一缶二水路風呂給湯器とほぼ同様のシステム構成を有しているが、本実施形態例では、給湯熱交換器３内の湯の温度を検出する給湯熱交換器湯温検出手段である給湯熱交湯温センサ３３を、図３の破線に示すように、給湯熱交換器３のＵ字管に設けており、また、図３において、追い焚き循環通路２４に設けられている流水スイッチ３６を省略して一缶二水路風呂給湯器を構成している。
【００３５】
図１には、本実施形態例に特有な制御構成がブロック図により示されており、同図に示すように、本実施形態例の一缶二水路風呂給湯器の制御装置４０は、追い焚き燃焼強制開始手段４６、燃焼制御部４２、追い焚き単独運転監視部４３、追い焚き単独運転燃焼制御部４５、データ格納部４４、給湯熱交水なし検知手段４９、追い焚き強制停止手段４８を有して構成されている。また、リモコン４１には、追い焚き異常報知手段５０が設けられている。
【００３６】
燃焼制御部４２には、給湯や追い焚きなどの様々な運転のシーケンスプログラムが与えられており、燃焼制御部４２はリモコン４１の情報や風呂温度センサ３７などのセンサ出力を取り込んで、それら取り込んだ情報とシーケンスプログラムに従って給湯器の燃焼運転動作を制御する。
【００３７】
追い焚き燃焼強制開始手段４６は、非給湯側燃焼強制開始手段として機能するものであり、リモコン４１から追い焚き指示が与えられたときに、循環ポンプ２０を駆動させるともに、燃焼制御部４２にバーナー燃焼運転開始指令を加え、それにより、追い焚き循環通路２４の湯水の流れを検知せずにバーナー燃焼運転を直ちに開始させる。
【００３８】
追い焚き単独運転監視部４３は、上記燃焼制御部４２の運転情報を取り込み、この情報に基づき、例えば、循環ポンプ２０の駆動を検知している状態で給湯確認スイッチ３５又は水量センサ３１が通水を検知していないときには、器具が追い焚き単独運転をしていると検知し、それ以外のときには器具は追い焚き単独運転をしていないと検知する。
【００３９】
データ格納部４４には、バーナー燃焼を停止させる設定温度としてのオフ温度とバーナー燃焼を再開させる設定温度としてのオン温度が予め定められて格納されている。上記オフ温度は、追い焚き単独運転中に給湯熱交換器３のピーク温度領域の滞留湯が沸騰に近い状態であることを示す予め定めた湯温（例えば、９０℃）になったときに給湯熱交湯温センサ３３により検出される湯温である。上記オン温度は、上記オフ温度よりも予め定めた温度（例えば、３℃）分だけ低下させた湯温である。
【００４０】
追い焚き単独運転燃焼制御部４５は、非給湯側単独運転燃焼制御部として機能するものであり、時々刻々と、給湯熱交湯温センサ３３のセンサ出力を給湯熱交換器３の湯温として検出し、また、データ格納部４４のオン温度とオフ温度および追い焚き単独運転監視部４３の監視情報を時々刻々と取り込み、取り込まれた検出給湯熱交換器湯温を前記オフ温度に比較し、上記追い焚き単独運転監視部４３の監視情報に基づき追い焚き単独運転中であると検知しているときに、給湯熱交換器３の湯温がオフ温度以上になったと判断したときに、バーナー２の燃焼を停止させる必要があると判断し、電磁弁１０を閉弁させバーナー２の燃焼を停止させる。
【００４１】
また、追い焚き単独運転燃焼制御部４５はバーナー燃焼停止信号を燃焼制御部４２に出力する。燃焼制御部４２は上記バーナー燃焼停止信号を受け、バーナー２の燃焼停止が追い焚き単独運転制御によりなされたものであり、器具の異常ではないと判断し、循環ポンプ２０の駆動等の器具運転動作を継続して行う。このため、上記追い焚き単独運転中のバーナー２の停止期間に循環ポンプ２０の駆動は継続される。
【００４２】
さらに、追い焚き単独運転燃焼制御部４５は、追い焚き単独運転中のバーナー２の燃焼停止中にも引き続き給湯熱交湯温センサ３３のセンサ出力と、データ格納部４４のオフ温度およびオン温度との取り込みを行って、給湯熱交湯温センサ３３により検出される給湯熱交換器３の湯温を前記オン温度に比較し、給湯熱交換器３の湯温がオン温度以下に低下したと判断したときに、バーナー２の燃焼を再開させてもよいと判断し、点着火手段（図示せず）を用いてバーナー２の点着火を行いバーナー２の燃焼を再開させる。
【００４３】
前記データ格納部４４には、前記追い焚き単独運転燃焼制御部４５によるバーナー２の燃焼と燃焼停止に伴う給湯熱交換器３の湯温変化のパターンが、給湯熱交湯温センサ３３の設置位置に対応した基準パターンとして与えられている。この基準パターンは、例えば図２の（ａ）に示すようなグラフデータや表データなどによって与えられており、給湯熱交湯温センサ３３を、図３の破線に示すように給湯熱交換器３のＵ字管に設けた場合の湯温変化パターンは図２の特性線ａとなり、給湯熱交湯温センサ３３を図３の鎖線に示すように給湯熱交換器３の出側に設けた場合の湯温変化パターンは図２の特性線ｂになるといったように、給湯熱交湯温センサ３３の設置位置に対応して各グラフデータ等が与えられている。
【００４４】
給湯熱交水なし検知手段４９は、時々刻々と、給湯熱交湯温センサ３３のセンサ出力を検出することにより給湯熱交換器３内の湯の温度を検出し、また、前記追い焚き単独運転監視部４３の監視情報を時々刻々と取り込み、追い焚き単独運転監視部４３の監視情報に基づいて追い焚き単独運転中であると検知しているときに、給湯熱交湯温センサ３３によって検出される検出温度データが、上記基準データの対応する湯温変化パターンと比較してランダム波状に変化するときには、給湯熱交換器３内に水がないことを検知する。
【００４５】
すなわち、本実施形態例においては、給湯熱交湯温センサ３３は、給湯熱交換器３のＵ字管に設けられているために、追い焚き単独運転中に給湯熱交湯温センサ３３によって検出される検出温度データを、図２の（ａ）に示した特性線ａと比較し、例えば同図の（ｂ）に示す特性線ａ′のように、検出温度データが前記特性線ａと比較してランダム波状に変化するときには、給湯熱交換器３内に水がないことを検知する。そして、給湯熱交水なし検知手段４９は、給湯熱交換器３内に水がないことを検知したときには、水なし検知信号を、追い焚き強制停止手段４８と追い焚き異常報知手段５０とに加える。
【００４６】
追い焚き強制停止手段４８は、非給湯側強制停止手段として機能するものであり、給湯熱交水なし検知手段４９により、給湯熱交換器３内に水がないことが検知されたときには、追い焚き運転を強制的に停止させるものであり、追い焚き単独運転燃焼制御部４５と燃焼制御部４２とに追い焚き停止指令を加え、追い焚き運転を強制的に停止させる。
【００４７】
追い焚き異常報知手段５０は、非給湯側運転異常報知手段として機能するものであり、給湯熱交水なし検知手段４９により、給湯熱交換器３内に水がないことが検知されたときには、追い焚き運転の異常を報知するものであり、例えばブザーや追い焚き異常ランプの点滅又は点灯などの適宜の報知手段を用いて追い焚き運転の異常を報知する。
【００４８】
なお、本実施形態例では、追い焚き異常報知手段５０は、追い焚き運転の異常をブザーによって報知するとともに、リモコン４１に設けられている表示部（図示せず）に、給湯熱交換器３内に水がないことを報知するエラーメッセージを表示するようにしている。
【００４９】
本実施形態例は以上の様に構成されており、本実施形態例ではリモコン４１の操作により、給湯器に追い焚き指示が与えられると、追い焚き燃焼強制開始手段４６によって、循環ポンプ２０の駆動が行われるとともに、燃焼制御部４２にバーナー燃焼開始指令が加えられ、追い焚き循環通路２４の湯水の流れを検知せずにバーナー燃焼運転が直ちに開始される。そして、給湯器が給湯運転を行っていないときには、追い焚き単独運転監視部４３によって器具が追い焚き単独運転をしていると検知され、追い焚き単独運転燃焼制御部４５によって、給湯熱交湯温センサ３３により検出される給湯熱交換器３の湯温と前記オフ温度およびオン温度に基づいて、前記の如くバーナー２のオン・オフ燃焼制御が行われる。
【００５０】
そして、追い焚き単独運転燃焼制御部４５によるバーナー２のオン・オフ燃焼制御が行えることによって、給湯熱交換器３内に湯があるときには、給湯熱交湯温センサ３３によって、例えば、図２の（ａ）の特性線ａに示した基準データと同様に、温度の緩やかな上昇と緩やかな下降をほぼ定期的に繰り返す温度データが検出され、一方、給湯熱交換器３内に水がないときには、例えば同図の（ｂ）の特性線ａ′に示すように、温度の急激な上昇と下降を不規則に、且つ、頻繁に繰り返すランダム波状の温度データが給湯熱交湯温センサ３３によって検出される。そして、これらの検出温度データが、給湯熱交水なし検知手段４９によって、前記基準データと比較され、検出温度データが基準データの対応する湯温変化パターンと比較してランダム波状に変化するときには、給湯熱交換器３内に水がないことが検知される。
【００５１】
そして、給湯熱交水なし検知手段４９によって給湯熱交換器３内に水がないことが検知されたときには、水なし検知信号が追い焚き強制停止手段４８に加えられ、追い焚き強制停止手段４８によって追い焚き運転が強制的に停止されるとともに、前記水なし検知信号が追い焚き異常報知手段５０に加えられ、ブザーなどの適宜の報知手段によって追い焚き運転の異常が報知される。
【００５２】
本実施形態例によれば、給湯熱交湯温センサ３３の設置位置に対応した基準データの湯温変化パターンと追い焚き単独運転中に給湯熱交湯温センサ３３によって検出される検出温度データとが給湯熱交水なし検知手段４９によって比較され、検出湯温データが前記基準データの湯温変化パターンと比較してランダム波状に変化するときには給湯熱交換器３内に水がないことを検知するために、例えば給湯器の設置以降に給湯運転が行われた後、給湯熱交換器内の水抜きが行われたとしても、追い焚き単独運転中に給湯熱交換器３内に水がないことを即座に検知することができる。
【００５３】
そして、本実施形態例によれば、給湯熱交水なし検知手段４９により給湯熱交換器３に水がないことが検知されたときには、追い焚き強制停止手段４８によって追い焚き運転を強制的に停止させるために、追い焚き単独運転が継続して行われることを抑制し、安全な一缶二水路風呂給湯器とすることができる。
【００５４】
さらに、本実施形態例によれば、給湯熱交水なし検知手段４９により給湯熱交換器３内に水がないことが検知されたときには、追い焚き異常報知手段５０によって追い焚き運転の異常を報知するために、給湯器の利用者に、給湯熱交換器３内に水がないために追い焚き運転の異常が生じたこと報知することが可能となり、それにより、給湯器の利用者に、給湯運転によって給湯熱交換器３内に水を通してから追い焚き運転を行うように注意を促すことができる。
【００５５】
さらに、本実施形態例によれば、追い焚き指示が与えられたときには、循環ポンプ２０を駆動させるとともに、追い焚き循環通路２４の湯水の流れを検知せずにバーナー燃焼運転を直ちに開始させるため、従来行われていた流水スイッチ３６による追い焚き循環通路２４の湯水の流れの検知動作を省略することが可能となり、その分だけ追い焚き運転動作を簡略化することができるし、浴槽湯水中の髪などのゴミが絡みつくことによって比較的故障が生じやすい流水スイッチ３６の誤動作に伴う追い焚き運転開始の誤動作を抑制できる。また、流水スイッチ３６を省略した分だけ給湯器のシステム構成を簡略化することが可能となり、器具のコストダウンを図ることができる。
【００５６】
なお、本発明は上記実施形態例に限定されることはなく、以下のような様々な実施の態様を採り得る。
【００５７】
上記実施形態例のように、追い焚き単独運転燃焼制御部４５によるバーナー２のオン・オフ燃焼制御を行う場合、給湯熱交換器３内に水があれば、例えば図２の（ａ）に示した湯温変化パターンのように、給湯熱交換器３内の温度がオフ温度を大幅に越えて高い温度になることはないが、給湯熱交換器３内に水がないと、例えば給湯熱交換器３の内壁に僅かに付着していた水がバーナー燃焼によって水蒸気となったりすることにより、給湯熱交湯温センサ３３の検出温度がオフ温度を大きく越えて高温になる。
【００５８】
したがって、予め実験等により、給湯熱交換器３内に水があるときに追い焚き単独運転燃焼制御部４５によるバーナー２のオン・オフ燃焼制御を行い、このときの給湯熱交湯温センサ３３の検出温度データを求め、この検出温度データにおけるピーク温度よりも高い温度を上記オフ温度よりも高い基準温度として定め、この基準温度と追い焚き単独運転中の給湯熱交湯温センサ３３の検出温度とを比較し、検出温度が上記オフ温度よりも高い基準温度に達したときに給湯熱交換器３内に水がないことを検知することにより、確実に給湯熱交換器３内の水なし検知を行うことができる。
【００６１】
さらに、上記実施形態例では、給湯熱交湯温センサ３３は給湯熱交換器３のＵ字管に設けられていたが、給湯熱交湯温センサ３３は、図３の鎖線に示すように、給湯熱交換器３の出側に設けるようにしてもよく、給湯熱交湯温センサ３３の設置位置は適宜設定されるものである。なお、給湯熱交水なし検知手段４９により、上記実施形態例のように、上記基準データと給湯熱交湯温センサ３３の検出温度データとの比較によって給湯熱交換器３内に水がないことを検知する場合には、上記検出温度データを、給湯熱交湯温センサ３３の設置位置に対応する湯温変化パターンと比較して給湯熱交換器３内に水がないことを検知する。
【００６２】
例えば、図２の（ａ）の特性線ｂは、給湯熱交湯温センサ３３を給湯熱交換器３の出側に設けた場合の給湯熱交換器３の湯温変化パターンを示しており、同図の（ｂ）の特性線ｂ′には、給湯熱交湯温センサ３３を給湯熱交換器３の出側に設けた場合の給湯熱交湯温センサ３３の検出温度データの一例が示されているが、給湯熱交湯温センサ３３を給湯熱交換器３の出側に設けた場合は給湯熱交水なし検知手段４９は、例えば上記特性線ｂ′を上記特性線ｂと比較して給湯熱交換器３内の水なし検知を行う。
【００６３】
さらに、上記実施形態例では、追い焚き強制停止手段４８を設け、給湯熱交水なし検知手段４９によって給湯熱交換器３内の水がないことが検知されたときには、追い焚き燃焼運転を強制的に停止させるようにしたが、追い焚き強制停止手段４８は省略することもできる。だだし、追い焚き強制停止手段４８を設け、給湯熱交換器３内に水がないときに追い焚き単独運転を強制的に停止させることにより、非常に安全性の高い一缶二水路（風呂）給湯器とすることができる。
【００６４】
さらに、上記実施形態例では、追い焚き異常報知手段５０を設け、給湯熱交水なし検知手段４９によって給湯熱交換器３内に水がないことが検知されたときには、追い焚き運転の異常を報知するようにしたが、追い焚き異常報知手段５０は省略することもできる。ただし、追い焚き異常報知手段５０を設け、追い焚き運転の異常を報知することにより、給湯器の利用者に注意を促すことができるし、さらに、上記実施形態例のように、追い焚き運転の異常報知とともに、給湯熱交換器３内に水がないことをエラーメッセージによって報知することにより、給湯熱交換器３内に水がないことを確実に給湯器の利用者に報知し、給湯熱交換器３内に水を満たした後に追い焚き運転を行うように注意を促すことができる。
【００６５】
さらに、上記実施形態例では、追い焚き燃焼強制開始手段４６を設け、リモコン４１から追い焚き指示が与えられたときには、循環ポンプ２０を駆動させるとともに、追い焚き循環通路２４の湯水の流れを検知せずに追い焚き運転を開始させるようにしたが、追い焚き燃焼強制開始手段４６を省略し、流水スイッチ３６などを追い焚き循環通路２４に設けて、従来と同様に、流水スイッチ３６などによる流水検知の後に追い焚き運転を開始させるようにしてもよい。
【００６６】
さらに、上記実施形態例のように、追い焚き燃焼強制開始手段４６を設ける場合にも、流水スイッチ３６などの追い焚き循環通路２４の流水検知手段を設けて一缶二水路（風呂）給湯器を構成しても構わない。
【００６７】
さらに、上記実施形態例では、給湯熱交換器３の湯温を給湯熱交湯温センサ３３から直接的に検出していたが、上記給湯熱交換器３の湯温は排気温度に基づき間接的に検出することが可能であることから、排気温度と給湯熱交換器３の湯温との関係データを予め実験や演算等により求めて与えておき、その関係データと排気温度によって給湯熱交換器３の湯温を間接的に検出する給湯熱交換器湯温検出手段を設けるようにしてもよい。より望ましくは、上記関係データと排気温度に基づき検出した給湯熱交換器湯温を、風呂温度センサ３７により検出される追い焚き循環通路の湯温や、予め定まる追い焚き循環湯量や、給気温度を考慮して補正することによって、より正確な給湯熱交換器３の湯温を検出することが可能である。
【００６８】
さらに、上記各実施形態例は図３に示す一缶二水路風呂給湯器を例にして説明したが、一缶二水路タイプで、給湯熱交換器の湯温を検出する給湯熱交換器湯温検出手段が設けられ、給湯機能と追い焚き機能を備えている一缶二水路風呂給湯器であれば、この発明を適用することができる。
【００６９】
さらに、上記実施形態例は一缶二水路風呂給湯器としたが、本発明は、一缶二水路風呂給湯器のみならず、例えば図４に示した給湯暖房機等の一缶二水路給湯器に広く適用できるものである。
【００７０】
【発明の効果】
本発明によれば、給湯熱交水なし検知手段を設け、追い焚き等の非給湯側単独運転中に給湯熱交換器湯温検出手段により検出される検出温度に基づいて、上記検出温度データが給湯熱交換器湯温検出手段の設置位置に対応した基準データの経時的な湯温変化パターンと比較して不規則に変化するときや、上記検出温度がバーナー燃焼をオフするためのたオフ温度よりも高い温度となるところの給湯熱交換器内に湯があるときの給湯熱交換器内湯温のピーク温度よりもさらに高い予め定められた基準温度に達したときに、給湯熱交換器内に水がないことを検知するようにしたものであるから、給湯器の設置以降、給湯運転が行われた後に給湯熱交換器内の水抜きが行われたとしても、非給湯側単独運転中に、迅速、且つ、確実に給湯熱交換器内に水がないことを検知することができる。
【００７１】
そのため、この検知結果を受けて、例えば非給湯側運転停止手段によって非給湯側運転を強制的に停止したり、異常報知手段によって非給湯側運転の異常報知したりすることが可能となり、非常に安全な一缶二水路給湯器とすることができる。
【００７２】
さらに、非給湯側運転指示が与えられたときに上記非給湯側循環通路に設けられた循環ポンプを駆動させるとともに上記非給湯側循環通路の湯水の流れを検知せずにバーナー燃焼運転を直ちに開始させる非給湯側燃焼強制開始手段が設けられている本発明によれば、非給湯側循環通路の湯水の流れを検知する流水スイッチなどを省略して給湯器を構成することが可能となり、その分だけ給湯器のシステム構成の簡略化およびコストダウンを図ることができる。
【００７３】
さらに、非給湯側循環通路は追い焚き循環通路とし、非給湯側熱交換器は追い焚き熱交換器とし、上記追い焚き循環通路を循環する熱媒体は湯水とし、非給湯側の運転は風呂の追い焚き運転とした本発明によれば、上記優れた効果を奏する一缶二水路風呂給湯器を構成することができる。
【図面の簡単な説明】
【図１】本発明に係る一缶二水路給湯器の一実施形態例の制御構成を示すブロック図である。
【図２】上記実施形態例の一缶二水路風呂給湯器に与えられる基準データの一例（ａ）と、給湯熱交換器内に水がないときに追い焚き単独運転中に給湯熱交湯温センサによって検出される検出温度データの一例（ｂ）を示すグラフである。
【図３】一缶二水路風呂給湯器のモデル例を示すシステム構成図である。
【図４】一缶二水路給湯器としての給湯暖房機のシステム構成例を示す説明図である。
【符号の説明】
３給湯熱交換器
３３給湯熱交湯温センサ
４４データ格納部
４５追い焚き単独燃焼制御部
４６追い焚き燃焼強制開始手段
４８追い焚き強制停止手段
４９給湯熱交水なし検知手段
５０追い焚き異常報知手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a canned and two-channel water heater in which a hot water supply heat exchanger and a non-hot water heat exchanger such as a reheating heat exchanger are integrated, and the integrated heat exchanger is heated by a common burner. is there.
[0002]
[Prior art]
FIG. 3 shows a system configuration example of a single can two water bath hot water heater that is an example of a single can two water heater developed by the present applicants. In the figure, this single can two water bath hot water heater (equipment) has a combustion chamber 1, a burner 2 is disposed in the combustion chamber 1, and a hot water supply heat exchanger 3 and a non-heater 3 are disposed above the burner 2. A reheating heat exchanger 4 as a hot water supply side heat exchanger is provided. These hot water supply heat exchangers 3 and reheating heat exchangers 4 are integrated. That is, the hot water supply side pipe line is inserted through a plurality of common fin plates 5 to form the hot water supply heat exchanger 3, and the reheating side pipe line is also inserted through the fin plate 5 to reheat the heat exchanger. The burner 2 is configured to heat both the hot water supply heat exchanger 3 and the reheating heat exchanger 4.
[0003]
The combustion chamber 1 on the lower side of the burner 2 communicates with an air supply passage 6, and a combustion fan 7 is incorporated in the air supply passage 6. Then, air is sent to the burner 2 and exhaust gas generated by the combustion of the burner 2 is discharged to the outside from the exhaust passage 9 communicating with the combustion chamber 1 above the burner 2.
[0004]
A gas nozzle 19 is disposed opposite to the gas inlet of the burner 2, and a gas supply passage 8 for introducing fuel gas is connected to the gas nozzle 19, and the fuel gas introduced by the gas supply passage 8 is connected to the gas nozzle 19. Is supplied to the burner 2 via the gas nozzle 19. The gas supply passage 8 is provided with electromagnetic valves 10, 11a, 11b for opening and closing the passage, and a proportional valve 12 for controlling the gas supply amount by the valve opening amount.
[0005]
One end side of the water supply passage 13 is connected to the inlet side of the hot water supply heat exchanger 3, one end side of the hot water supply passage 14 is connected to the outlet side of the hot water supply heat exchanger 3, and the other end side of the water supply passage 13 is It is connected to a water supply source through an external pipe, and the other end of the hot water supply passage 14 is led to a desired hot water supply place such as a kitchen through the external pipe. Further, a bypass passage 15 for short-circuiting the inlet side water supply passage 13 and the outlet side hot water supply passage 14 of the hot water supply heat exchanger 3 is provided, and a bypass valve 16 for opening and closing the passage is interposed in the bypass passage 15. It is installed.
[0006]
One end of a pipe 18 is connected to the inlet side of the reheating heat exchanger 4, and the other end of the pipe 18 is connected to the discharge port of the circulation pump 20. One end side of the return pipe 21 is connected, and the other end side of the return pipe 21 is connected to the bathtub 22. In addition, one end side of a pipe line 23 is connected to the outlet side of the reheating heat exchanger 4, and the other end side of the pipe line 23 is connected to the bathtub 22. The return pipe 21, the circulation pump 20, the pipe 18, the reheating heat exchanger 4, and the pipe 23 constitute a recirculation circulation path 24 as a non-hot water supply side circulation path.
[0007]
The pipe 18 of the recirculation circulation passage 24 and the hot water supply passage 14 are communicated with each other by a hot water filling passage 25, and the hot water filling passage 25 has a pouring control valve 26 for controlling the opening and closing of the passage, and the water level of the bathtub 22. And a water level sensor 28 for detecting the above.
[0008]
In the figure, 30 is an air volume sensor that detects the air volume in the combustion chamber 1, 31 is a water volume sensor that is provided in the water supply passage 13 and detects the flow rate of the water supply, and 32 is water in the water supply passage 13. A water temperature sensor for detecting temperature, 34 is a flow rate control valve provided in the hot water supply passage 14 to control the flow rate of water flow, and 35 is provided in the hot water supply passage 14 to indicate that hot water is being supplied. A hot water supply confirmation switch to be detected, 36 is a flowing water switch for detecting the presence or absence of a water flow in the recirculation circulation passage 24, and 37 is a bath for detecting the hot water temperature in the recirculation circulation passage 24 as a bath water temperature (bath temperature). A temperature sensor 38 is a tapping temperature sensor that detects the temperature of the hot water produced by the hot water supply heat exchanger 3.
[0009]
A control device 40 is provided in the single can two water bath hot water heater, and a remote controller 41 is connected to the control device 40. The remote control 41 is provided with hot water supply temperature setting means for setting the hot water supply temperature, bath temperature setting means for setting the bath temperature of the bathtub 22, bath water level setting means for setting the hot water level of the bathtub 22, and the like. ing.
[0010]
The control device 40 takes in sensor output signals from various sensors and information from the remote controller 41, and performs various appliance operations such as a hot water supply operation, a hot water filling operation and a reheating operation according to the information and a sequence program given in advance. The operation is controlled as follows.
[0011]
For example, when a faucet of a hot water supply passage led to a kitchen or the like is opened, water flows into the water supply passage 13 from a water supply source, and the water amount sensor 31 detects water passing through the water supply passage 13, the appliance starts a hot water supply operation. . First, the rotational drive of the combustion fan 7 is started, and both or one of the solenoid valves 11a and 11b and the solenoid valve 10 are opened to supply the fuel gas to the burner 2 through the gas supply passage 8, which is not shown. The burner 2 is ignited by ignition means to start combustion.
[0012]
Then, the valve opening amount of the proportional valve 12 is controlled (the amount of gas supplied to the burner 2 is controlled) so that the hot water temperature becomes the hot water setting temperature set in the hot water temperature setting means. The combustion capacity is controlled, and the water flowing through the hot water supply heat exchanger 3 is heated by the combustion flame of the burner 2 to produce hot water having a set temperature, and this hot water is supplied to the hot water supply place through the hot water supply passage 14.
[0013]
When the use of hot water is finished and the faucet is closed, water flow to the hot water supply heat exchanger 3 is stopped, and the electromagnetic valve 10 is closed when the water amount sensor 31 no longer detects water flow through the water supply passage 13. The combustion of the burner 2 is stopped. Thereafter, when a predetermined post-purge period (for example, 5 minutes) elapses, the rotation drive of the combustion fan 7 is stopped, the hot water supply operation is terminated, and the next hot water supply is prepared.
[0014]
When performing the hot water filling operation, for example, the pouring control valve 26 is opened, and by the opening operation of the pouring control valve 26, water flows from the water supply source into the water supply passage 13, and the water amount sensor 31 is connected to the water supply passage 13. When water flow is detected, combustion of the burner 2 is started similarly to the hot water supply operation.
[0015]
Hot water produced in the hot water supply heat exchanger 3 by the combustion flame of the burner 2 is sent to the recirculation circulation passage 24 through the hot water supply passage 14 and the hot water filling passage 25 in order, and the hot water flowing into the recirculation circulation passage 24 returns. It is dropped into the bathtub 22 by two paths, a path passing through the pipe 21 and a path passing through the reheating heat exchanger 4. When the water level of the bathtub 22 detected by the water level sensor 28 reaches the set water level set in the remote controller 41, the pouring control valve 26 is closed, the electromagnetic valve 10 is closed, and the combustion of the burner 2 is stopped. The hot water filling operation is terminated.
[0016]
When the reheating operation is performed, the circulation pump 20 is driven to circulate hot water in the bathtub 22 as a heat medium through the recirculation circulation passage 24, and the flowing water switch 36 detects the flow of hot water in the recirculation circulation passage 24. The combustion of the burner 2 is started. Then, the hot and cold water in the reheating heat exchanger 4 is heated by the combustion flame of the burner 2 to reheat, and the bath temperature detected by the bath temperature sensor 37 becomes the set temperature set by the bath temperature setting means. When it reaches, the combustion of the burner 2 is stopped and the chasing operation is ended.
[0017]
As described above, the single can two water bath hot water heater is a system in which the integrated hot water supply heat exchanger 3 and the reheating heat exchanger 4 are heated by using the common burner 2, and thus are provided separately. Compared with the method in which the hot water supply heat exchanger and the reheating heat exchanger are each heated by combustion using separate burners, the structure of the apparatus can be simplified, and accordingly, the apparatus can be reduced in size and cost can be reduced. Become.
[0018]
FIG. 4 shows an example of a hot water heater as a single can two water heater. In FIG. 4, the same reference numerals are assigned to the same names as the single can two water bath water heater in FIG. It is. Further, in the figure, 57 indicates a heating heat exchanger as a non-hot water supply side heat exchanger, 52 is a heating on / off valve, 53 is a radiator, 54 is a fan, 55 is a cistern tank, and 56 is a bypass passage. Respectively. As the heat medium circulating in the heating circulation passage 51, for example, a solution obtained by adding water to ethylene glycol and propylene glycol is used.
[0019]
[Problems to be solved by the invention]
By the way, in the canned and two-channel bath water heater as described above, when there is no water in the hot water supply heat exchanger 3, no hot water is supplied and only the reheating operation is performed. Since the exchanger 3 is empty and dangerous, for example, in Japanese Patent Publication No. 2592406, a water flow sensor is provided in a water supply water supply pipe to determine whether water has passed through the water supply pipe. On the other hand, there has been proposed a device that writes data with water flow in the water flow history memory when there is water flow, and prohibits chasing and independent operation when this data is not written.
[0020]
However, since water is not passed at the time of installation of the hot water heater, etc., it is possible to prevent the hot water supply heat exchanger 3 from being emptied by providing such a device in the single can two water bath hot water heater. However, for example, if water is drained after checking the water flow in the water flow pipe to prevent freezing of the hot water heat exchanger 3, there is water flow in the water flow history memory of this device. Therefore, there is a problem that the hot water supply heat exchanger 3 is sprinkled. Such a problem occurs not only in a single can two water bath water heater, but also in a single can two water heater such as the hot water heater shown in FIG.
[0021]
The present invention has been made to solve the above-mentioned problems, and its purpose is to drain water from a hot water supply heat exchanger after installation of a single can two water heater such as a single can two water bath water heater. It is an object of the present invention to provide a single-can two-water channel water heater that can prevent the hot water supply heat exchanger from emptying even if it is broken.
[0024]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, the first invention is a hot water heat exchanger that heats water guided from a water supply passage and supplies hot water to the hot water supply passage, and a heat medium that is incorporated in the non-hot water supply side circulation passage and circulates through the non-hot water supply side circulation passage. A non-hot water supply side heat exchanger for heating the hot water supply heat exchanger and the non-hot water supply side heat exchanger, and a burner for heating the hot water supply heat exchanger and the non-hot water supply side heat exchanger in common. The non-hot water supply side that does not perform hot water supply and performs only the operation of the non-hot water supply side, provided with a hot water supply heat exchanger hot water temperature detection means for detecting the temperature of hot water in the hot water supply heat exchanger in the provided single can two-way water heater When the detected temperature detected by the hot water supply heat exchanger hot water temperature detection means during a single operation becomes equal to or higher than a set temperature for stopping the burner combustion, the burner combustion is stopped, and the hot water supply heat exchanger hot water temperature detection means is detected. The set temperature at which the temperature resumes burner combustion Non hot water supply side has islanding combustion control unit, there is a hot water non hot water supply side islanding combustion control unit entailment in the hot water supply heat exchanger to the combustion and the combustion stop of the burner by resuming the combustion of the burner when it is below The pattern of the hot water temperature change over time of the hot water heat exchanger in the state is given as reference data corresponding to the installation position of the hot water heat exchanger hot water temperature detecting means, and the hot water supply side during the non-hot water supply side independent operation When the change over time of the detected temperature data detected by the heat exchanger hot water temperature detecting means changes irregularly compared with the corresponding hot water temperature change pattern of the reference data, it is confirmed that there is no water in the hot water heat exchanger. A configuration provided with a detection means for detecting no hot water supply and hot water is used as means for solving the problem.
[0025]
Further, the second invention, the heat medium circulating and hot-water supply heat exchanger for supplying hot water to the hot water supply passage heated derived from the water supply passage of water, a non-hot-water-supply-side circulation path incorporated in the non-hot-water-supply-side circulation path A non-hot water supply side heat exchanger for heating the hot water supply heat exchanger and the non-hot water supply side heat exchanger, and a burner for heating the hot water supply heat exchanger and the non-hot water supply side heat exchanger in common. The non-hot water supply side that does not perform hot water supply and performs only the operation of the non-hot water supply side, provided with a hot water supply heat exchanger hot water temperature detection means for detecting the temperature of hot water in the hot water supply heat exchanger in the provided single can two-way water heater When the detected temperature detected by the hot water supply heat exchanger hot water temperature detecting means becomes the off temperature or higher during the single operation, combustion of the burner is stopped, and the detected temperature of the hot water heat exchanger hot water temperature detecting means is burner combustion. When the temperature drops below the set temperature Has a non-hot-water-supply-side islanding combustion control unit to restart the combustion over, from off temperature of the temperature detected in the non-hot-water-supply-side islanding is detected by the hot water supply heat exchanger water temperature detecting means stops the burner combustion When a predetermined reference temperature that is higher than the peak temperature of the hot water in the hot water supply heat exchanger when hot water is present in the hot water heat exchanger where the temperature is higher than that in the hot water supply heat exchanger, A means for solving the problem is provided with a configuration in which there is no hot water / hot water / water detection means for detecting the absence of hot water.
[0026]
Further, in the third invention, in addition to the configuration of the first or second invention described above, when no hot water hot water exchange detection means detects that there is no water in the hot water heat exchanger, the non-hot water supply side The non-hot water supply side forced stop means for forcibly stopping the operation is provided as means for solving the problem.
[0027]
Further, in the fourth invention, in addition to any one of the first to third inventions described above, it is detected that there is no water in the hot water supply heat exchanger by the hot water supply no-hot water exchange detection means. In such a case, the non-hot water supply side operation abnormality notifying means for notifying the abnormality of the non-hot water supply side operation is provided as means for solving the problem.
[0028]
Further, when a non-hot water supply side operation instruction is given, the circulation pump provided in the non-hot water supply side circulation passage is driven and the burner combustion operation is immediately started without detecting the flow of hot water in the non-hot water supply side circulation passage. The non-hot water supply side forced combustion start means is also a characteristic feature of the first to fourth inventions.
[0029]
Further, the non-hot water supply side circulation passage is a reheating circulation passage, the non-hot water supply side heat exchanger is a reheating heat exchanger, the heat medium circulating in the reheating circulation passage is hot water, and the operation on the non-hot water supply side is a bath. Further, it is the characteristic configuration of the first to fifth aspects of the invention.
[0032]
As described above, in the present invention, in order to detect the absence of water in the hot water supply heat exchanger based on the detected temperature of the hot water supply heat exchanger hot water temperature detecting means detected during the non-hot water supply side single operation, Even if water in the hot water heat exchanger is drained after the hot water heater is installed, it can be accurately detected that there is no water in the hot water heat exchanger, and thus the empty space on the hot water heat exchanger side can be detected. It is possible to prevent whispering, and the above problem is solved.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, one can two water channel water heater of this embodiment example is a can two water channel bath water heater, and in the description of this embodiment example, the same reference numerals are used for the same names as one can two water channel bath water heater. The duplicate explanation is omitted.
[0034]
One can two water bath hot water heater of this embodiment example has a system configuration substantially the same as the one can two water bath hot water heater of the proposed example shown in FIG. 3, but in this embodiment, As shown by the broken line in FIG. 3, a hot water supply heat exchanger temperature sensor 33 which is a hot water supply heat exchanger hot water temperature detecting means for detecting the temperature of hot water in the exchanger 3 is provided in the U-shaped tube of the hot water supply heat exchanger 3. Further, in FIG. 3, the canned water switch bath water heater is configured by omitting the flowing water switch 36 provided in the recirculation circulation passage 24.
[0035]
FIG. 1 is a block diagram showing a control configuration peculiar to the present embodiment example. As shown in FIG. 1, the control device 40 of the single can two-way bath water heater of the present embodiment Combustion forced start means 46, combustion control section 42, reheating isolated operation monitoring section 43, reheating isolated operation combustion control section 45, data storage section 44, no hot water hot water / water detection means 49, reheating forced stop means 48 Configured. Further, the remote control 41 is provided with a chasing abnormality notification means 50.
[0036]
The combustion control unit 42 is provided with various operation sequence programs such as hot water supply and reheating, and the combustion control unit 42 takes in information from the remote controller 41 and sensor output from the bath temperature sensor 37 and the like. The combustion operation of the water heater is controlled according to the information and the sequence program.
[0037]
The reheating combustion forcible start means 46 functions as non-hot water supply side combustion forcible start means. When a reheating instruction is given from the remote control 41, the recirculation pump 20 is driven and the combustion control unit 42 is caused to burn. A combustion operation start command is added, whereby the burner combustion operation is immediately started without detecting the flow of hot water in the recirculation circulation passage 24.
[0038]
The reheating independent operation monitoring unit 43 takes in the operation information of the combustion control unit 42, and based on this information, for example, the hot water supply confirmation switch 35 or the water amount sensor 31 detects water flow while detecting the driving of the circulation pump 20. When it is not detected, it is detected that the appliance is in a reciprocal single operation, and in other cases, it is detected that the device is not in a replenishment single operation.
[0039]
In the data storage unit 44, an off temperature as a set temperature for stopping the burner combustion and an on temperature as a set temperature for restarting the burner combustion are determined and stored. When the off-temperature reaches a predetermined hot water temperature (for example, 90 ° C.) indicating that the staying hot water in the peak temperature region of the hot water supply heat exchanger 3 is close to boiling during the reheating independent operation, This is the hot water temperature detected by the hot water temperature sensor 33. The ON temperature is a hot water temperature that is lower than the OFF temperature by a predetermined temperature (for example, 3 ° C.).
[0040]
The reheating independent operation combustion control unit 45 functions as a non-hot water supply side independent operation combustion control unit, and detects the sensor output of the hot water supply hot / cold hot water temperature sensor 33 as the hot water temperature of the hot water supply heat exchanger 3 every moment. In addition, the on- and off-temperatures of the data storage unit 44 and the monitoring information of the follow-up single operation monitoring unit 43 are captured every moment, and the detected hot water supply heat exchanger hot water temperature is compared with the off temperature, When it is determined that the reheating independent operation is being performed based on the monitoring information of the reheating independent operation monitoring unit 43, It is determined that it is necessary to stop the combustion, and the solenoid valve 10 is closed to stop the combustion of the burner 2.
[0041]
Further, the reheating independent operation combustion control unit 45 outputs a burner combustion stop signal to the combustion control unit 42. The combustion control unit 42 receives the burner combustion stop signal, determines that the combustion stop of the burner 2 has been made by the follow-up single operation control, and that it is not an abnormality of the appliance, and the appliance operation operation such as driving of the circulation pump 20 is performed. To continue. For this reason, the drive of the circulation pump 20 is continued during the stop period of the burner 2 during the above-mentioned reheating independent operation.
[0042]
Further, the reheating independent operation combustion control unit 45 continues the sensor output of the hot water supply hot water temperature sensor 33 and the off temperature and on temperature of the data storage unit 44 even while the combustion of the burner 2 during reheating independent operation is stopped. The hot water temperature of the hot water supply heat exchanger 3 detected by the hot water supply hot water temperature sensor 33 is compared with the ON temperature, and it is determined that the hot water temperature of the hot water supply heat exchanger 3 has dropped below the ON temperature. In this case, it is determined that the combustion of the burner 2 may be resumed, and the ignition of the burner 2 is performed using a spot ignition means (not shown) to resume the combustion of the burner 2.
[0043]
In the data storage unit 44, the hot water temperature change pattern of the hot water supply heat exchanger 3 that accompanies combustion and stop of combustion of the burner 2 by the reheating single operation combustion control unit 45 is indicated by the installation position of the hot water supply hot water temperature sensor 33. Is given as a reference pattern. The reference pattern is given by, for example, graph data or table data as shown in FIG. 2A, and the hot water supply / hot water temperature sensor 33 is connected to the hot water supply heat exchanger 3 as shown by a broken line in FIG. 2 is a characteristic line a in FIG. 2, and a hot water hot water temperature sensor 33 is provided on the outlet side of the hot water heat exchanger 3 as shown by a chain line in FIG. Each hot water temperature change pattern is indicated by a characteristic line b in FIG. 2, and each graph data and the like is given corresponding to the installation position of the hot water supply hot water temperature sensor 33.
[0044]
The no hot water supply hot water exchange detection means 49 detects the temperature of the hot water in the hot water supply heat exchanger 3 by detecting the sensor output of the hot water supply hot water supply hot water temperature sensor 33 from time to time. When the monitoring information of the monitoring unit 43 is taken in every moment and it is detected that the reheating independent operation is being performed based on the monitoring information of the reheating isolated operation monitoring unit 43, the hot water supply hot / cold hot water temperature sensor 33 detects it. When the detected temperature data changes in a random wave pattern as compared with the corresponding hot water temperature change pattern of the reference data, it is detected that there is no water in the hot water supply heat exchanger 3.
[0045]
That is, in the present embodiment, since the hot water supply hot water temperature sensor 33 is provided in the U-shaped tube of the hot water supply heat exchanger 3, it is detected by the hot water supply hot water temperature sensor 33 during the reheating independent operation. The detected temperature data is compared with the characteristic line a shown in FIG. 2A. For example, the detected temperature data is compared with the characteristic line a as shown by the characteristic line a ′ shown in FIG. When it changes to a random wave shape, it is detected that there is no water in the hot water supply heat exchanger 3. When the hot water supply / hot water exchange detection means 49 detects that there is no water in the hot water supply heat exchanger 3, the hot water supply heat exchanger 3 applies a no water detection signal to the reheating forced stop means 48 and reheating abnormality notification means 50. .
[0046]
The reheating forced stop means 48 functions as a non-hot water supply side forced stop means. When the absence of hot water in the hot water supply heat exchanger 3 is detected by the hot water supply heat exchange / no-water detection means 49, the renewal forced stop means 48 is reheated. The operation is forcibly stopped, and a refueling stop command is added to the reheating isolated operation combustion control unit 45 and the combustion control unit 42 to forcibly stop the reheating operation.
[0047]
The reheating abnormality notifying means 50 functions as a non-hot water supply side operation abnormality notifying means, and when the absence of hot water in the hot water supply heat exchanger 3 is detected by the hot water supply / hot water exchange detection means 49, An abnormality in the whirling operation is notified, and the abnormality in the chasing operation is notified by using an appropriate notifying means such as a buzzer or a blinking or lighting error lamp.
[0048]
In the present embodiment, the reheating abnormality notifying means 50 notifies the abnormality of the reheating operation with a buzzer, and the display unit (not shown) provided in the remote controller 41 has the inside of the hot water supply heat exchanger 3. An error message notifying that there is no water is displayed.
[0049]
The present embodiment is configured as described above. In this embodiment, when the reheating instruction is given to the water heater by the operation of the remote controller 41, the recirculation combustion forcible start means 46 drives the circulation pump 20. In addition, a burner combustion start command is added to the combustion control unit 42, and the burner combustion operation is immediately started without detecting the flow of hot water in the recirculation circulation passage 24. When the water heater is not performing a hot water supply operation, the reheating isolated operation monitoring unit 43 detects that the appliance is retreating, and the reheating independent operation combustion control unit 45 detects the hot water supply hot water temperature. On / off combustion control of the burner 2 is performed based on the hot water temperature of the hot water supply heat exchanger 3 detected by the sensor 33 and the off temperature and on temperature as described above.
[0050]
When the hot water in the hot water supply heat exchanger 3 is hot by performing the on / off combustion control of the burner 2 by the reheating single operation combustion control unit 45, the hot water supply hot water temperature sensor 33, for example, in FIG. Similar to the reference data indicated by the characteristic line a in (a), temperature data is detected that repeats a gradual rise and fall of the temperature almost regularly. On the other hand, when there is no water in the hot water supply heat exchanger 3 For example, as shown by the characteristic line a ′ in FIG. 5B, random temperature-like temperature data that irregularly and frequently repeats a rapid rise and fall in temperature is detected by the hot water supply hot water temperature sensor 33. Is done. And these detected temperature data are compared with the said reference data by the detection means 49 without hot water supply hot water exchange, and when the detected temperature data changes in a random wave shape compared with the corresponding hot water temperature change pattern of the reference data, It is detected that there is no water in the hot water supply heat exchanger 3.
[0051]
When it is detected that there is no water in the hot water supply heat exchanger 3 by the hot water supply / hot water exchange detection means 49, a water absence detection signal is applied to the follow-up forced stop means 48, and the follow-up forced stop means 48 The chasing operation is forcibly stopped, the waterless detection signal is added to the chasing abnormality notifying means 50, and the abnormality of the chasing operation is notified by an appropriate notifying means such as a buzzer.
[0052]
According to the present embodiment, the hot water temperature change pattern of the reference data corresponding to the installation position of the hot water hot water temperature sensor 33 and the detected temperature data detected by the hot water hot water temperature sensor 33 during the reheating independent operation, Are compared by the no-hot-water hot water exchange detection means 49, and when the detected hot water temperature data changes in a random wave pattern as compared with the hot water temperature change pattern of the reference data, it is detected that there is no water in the hot water supply heat exchanger 3. For this reason, for example, even after the hot water supply operation is performed after the water heater is installed and the water is drained from the hot water heat exchanger, there is no water in the hot water heat exchanger 3 during the reheating independent operation. Can be detected immediately.
[0053]
Then, according to this embodiment, when the hot water supply heat exchanger 3 detection means 49 detects that there is no water in the hot water supply heat exchanger 3, the reheating forced stop means 48 forcibly stops the reheating operation. For this reason, it is possible to suppress the continuous isolated operation from being continued and to provide a safe one-can two-water bath water heater.
[0054]
Furthermore, according to the present embodiment, when no hot water supply / hot water detection means 49 detects that there is no water in the hot water supply heat exchanger 3, the reheating abnormality notification means 50 notifies the abnormality of the reheating operation. Therefore, it becomes possible to notify the user of the hot water heater that the abnormality in the reheating operation has occurred because there is no water in the hot water supply heat exchanger 3. It is possible to urge the driver to perform the chasing operation after passing water through the hot water supply heat exchanger 3 by the operation.
[0055]
Furthermore, according to this embodiment, when the reheating instruction is given, the circulation pump 20 is driven, and the burner combustion operation is immediately started without detecting the hot water flow in the recirculation circulation passage 24. It is possible to omit the operation of detecting the flow of hot water in the recirculation circulation passage 24 by the flowing water switch 36 which has been conventionally performed, and the reheating operation can be simplified by that much, and the hair in the bathtub hot water can be simplified. It is possible to suppress a malfunction at the start of a reheating operation associated with a malfunction of the flowing water switch 36, which is likely to cause a failure due to entanglement of dust such as. In addition, the system configuration of the water heater can be simplified by the amount that the running water switch 36 is omitted, and the cost of the appliance can be reduced.
[0056]
In addition, this invention is not limited to the said embodiment example, The following various aspects can be taken .
[0057]
As above Symbol embodiment, when performing on-off combustion control of the burner 2 by islanding combustion control unit 45 reheating, if there is water in the hot water supply heat exchanger 3, for example, in FIG. 2 (a) As shown in the hot water temperature change pattern, the temperature in the hot water supply heat exchanger 3 does not greatly exceed the off temperature and becomes high, but if there is no water in the hot water supply heat exchanger 3, for example, the hot water supply heat The water slightly adhering to the inner wall of the exchanger 3 becomes steam due to burner combustion, so that the temperature detected by the hot water supply hot water temperature sensor 33 greatly exceeds the off temperature and becomes high.
[0058]
Therefore, when there is water in the hot water supply heat exchanger 3 by experiments or the like in advance, the on / off combustion control of the burner 2 is performed by the follow-up single operation combustion control unit 45, and the hot water supply hot water temperature sensor 33 at this time The detected temperature data is obtained, a temperature higher than the peak temperature in the detected temperature data is set as a reference temperature higher than the off temperature, and the detected temperature of the hot water supply hot / cold hot water temperature sensor 33 during the reheating independent operation is determined. And detecting that there is no water in the hot water supply heat exchanger 3 when the detected temperature reaches a reference temperature higher than the off temperature, thereby reliably detecting the absence of water in the hot water supply heat exchanger 3. It can be carried out.
[0061]
Further, in the above-described embodiment, the hot water supply hot water temperature sensor 33 is provided in the U-shaped tube of the hot water supply heat exchanger 3, but the hot water supply hot water supply temperature sensor 33 is as shown by a chain line in FIG. It may be provided on the outlet side of the hot water supply heat exchanger 3, and the installation position of the hot water supply hot water temperature sensor 33 is appropriately set. It should be noted that there is no water in the hot water supply heat exchanger 3 by comparing the reference data with the temperature data detected by the hot water supply hot water temperature sensor 33 by the hot water supply hot water exchange detection means 49 as in the above embodiment. Is detected, the detected temperature data is compared with a hot water temperature change pattern corresponding to the installation position of the hot water supply hot water temperature sensor 33 to detect that there is no water in the hot water supply heat exchanger 3.
[0062]
For example, the characteristic line b in FIG. 2A shows the hot water temperature change pattern of the hot water supply heat exchanger 3 when the hot water supply hot water temperature sensor 33 is provided on the outlet side of the hot water supply heat exchanger 3. The characteristic line b ′ in FIG. 5B shows an example of temperature detection data detected by the hot water supply / hot water temperature sensor 33 when the hot water supply / hot water temperature sensor 33 is provided on the outlet side of the hot water supply heat exchanger 3. However, when the hot water supply / hot water temperature sensor 33 is provided on the outlet side of the hot water supply heat exchanger 3, the hot water / hot water exchange detection means 49 compares the characteristic line b 'with the characteristic line b, for example. Then, waterless detection in the hot water supply heat exchanger 3 is performed.
[0063]
Further, in the above-described embodiment, the reheating forced stop means 48 is provided, and the reheating combustion operation is forcibly performed when the absence of water in the hot water supply heat exchanger 3 is detected by the hot water supply / hot water exchange detection means 49. However, the follow-up forced stop means 48 can be omitted. However, by providing a forced renewal stop means 48 and forcibly stopping the reheating independent operation when there is no water in the hot water supply heat exchanger 3, a very safe single can two water channel (bath) It can be a water heater.
[0064]
Further, in the above embodiment, the reheating abnormality notifying means 50 is provided, and when the absence of water in the hot water supply heat exchanger 3 is detected by the hot water hot water exchange detection means 49, the renewal operation abnormality is notified. However, the chasing abnormality notifying means 50 can be omitted. However, it is possible to alert the user of the water heater by providing a chasing abnormality notification means 50 and notifying the chasing operation abnormality. Further, as in the above-described embodiment, Along with anomaly notification, an error message notifies the user of the hot water supply heat exchanger 3 that there is no water, thereby reliably informing the user of the hot water supply device that there is no water in the hot water heat exchanger 3, and hot water heat exchange. Attention can be urged to carry out a chasing operation after filling the vessel 3 with water.
[0065]
Further, in the above embodiment, the reheating combustion forced start means 46 is provided, and when the reheating instruction is given from the remote controller 41, the circulation pump 20 is driven and the flow of hot water in the recirculation circulation passage 24 is detected. Although the reheating operation is started, the reheating combustion forcible start means 46 is omitted, and the water flow switch 36 and the like are provided in the recirculation circulation passage 24, and the water flow detection by the water flow switch 36 and the like is performed as in the conventional case. After that, the chasing operation may be started.
[0066]
Further, as in the above embodiment, even when the reheating combustion forcible starting means 46 is provided, the water flow detecting means for the recirculation circulation passage 24 such as the water flow switch 36 is provided to provide a single can two water channel (bath) water heater. You may comprise.
[0067]
Further, in the above embodiment, the hot water temperature of the hot water supply heat exchanger 3 is detected directly from the hot water supply hot water temperature sensor 33, but the hot water temperature of the hot water supply heat exchanger 3 is indirectly based on the exhaust gas temperature. Therefore, the relationship data between the exhaust temperature and the hot water temperature of the hot water supply heat exchanger 3 is obtained in advance through experiments and calculations, and the hot water supply heat exchanger is determined according to the relationship data and the exhaust temperature. The hot water supply heat exchanger hot water temperature detecting means for indirectly detecting the hot water temperature 3 may be provided. More preferably, the hot water temperature of the hot water supply heat exchanger detected based on the relational data and the exhaust gas temperature is determined based on the hot water temperature of the recirculation circulation path detected by the bath temperature sensor 37, the predetermined recirculation hot water volume, and the supply air temperature. Therefore, the hot water temperature of the hot water supply heat exchanger 3 can be detected more accurately.
[0068]
Further, each of the above-described embodiments has been described by taking the single-can two-water bath water heater shown in FIG. 3 as an example. However, the single-can two-water channel type is a hot water heater for detecting the hot water temperature of the hot water heat exchanger. The present invention can be applied to any one can two water channel bath water heater provided with detection means and having a hot water supply function and a reheating function.
[0069]
Furthermore, although the above embodiment is a single can two water bath hot water heater, the present invention is not limited to a single can two water bath hot water heater, but a single can two water heater such as the hot water heater shown in FIG. It can be widely applied to.
[0070]
【The invention's effect】
According to the present invention, the hot water supply heat交水no detection means is provided, based on the detected temperature detected by the hot water supply heat exchanger water temperature detecting means during the non-hot-water-supply-side independent operation of such reheating, the upper Symbol detected temperature data When the detected temperature changes irregularly compared to the time-dependent hot water temperature change pattern of the reference data corresponding to the installation location of the hot water heat exchanger hot water temperature detecting means, or when the detected temperature is turned on for turning off the burner combustion. The hot water supply heat exchanger when a predetermined reference temperature higher than the peak temperature of the hot water temperature in the hot water supply heat exchanger when hot water is in the hot water supply heat exchanger where the temperature is higher than the hot water temperature is reached. Since there is no water in the water heater, after the hot water heater is installed, even if water is removed from the hot water heat exchanger after the hot water heater is operated, the non-hot water heater is operated independently. Inside the hot water heat exchanger quickly and reliably It is possible to detect that there is no water.
[0071]
Therefore, in response to this detection result, for example, it is possible to forcibly stop the non-hot water supply side operation by the non-hot water supply side operation stop means, or to notify the abnormality notification of the non-hot water supply side operation by the abnormality notification means. It can be set as a safe canned and double water heater.
[0072]
Further, when a non-hot water supply side operation instruction is given, the circulation pump provided in the non-hot water supply side circulation passage is driven and the burner combustion operation is immediately started without detecting the flow of hot water in the non-hot water supply side circulation passage. According to the present invention in which the non-hot water supply side combustion forced start means is provided, it is possible to configure a hot water heater by omitting a flowing water switch that detects the flow of hot water in the non-hot water supply side circulation passage. Only the system configuration of the water heater can be simplified and the cost can be reduced.
[0073]
Furthermore, the non-hot water supply side circulation passage is a reheating circulation passage, the non-hot water supply side heat exchanger is a reheating heat exchanger, the heat medium circulating in the reheating circulation passage is hot water, and the operation on the non-hot water supply side is a bath. According to the present invention, which is a reheating operation, it is possible to configure a single can / two water bath hot water heater that exhibits the above-described excellent effects.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a control configuration of an embodiment of a single can / two water heater according to the present invention.
FIG. 2 shows an example (a) of reference data given to a single can two-way bath water heater in the above embodiment, and a hot water hot water temperature during a single operation when there is no water in the hot water heat exchanger. It is a graph which shows an example (b) of the detection temperature data detected by a sensor.
FIG. 3 is a system configuration diagram showing a model example of a single can / two water bath hot water heater.
FIG. 4 is an explanatory diagram showing a system configuration example of a hot water heater as a single can two water channel hot water heater.
[Explanation of symbols]
3 Hot water supply heat exchanger 33 Hot water supply hot water temperature sensor 44 Data storage unit 45 Reheating single combustion control unit 46 Reheating combustion forced start means 48 Reheating forced stop means 49 Hot water hot water non-detection means 50 Reheating abnormality notification means

Claims

A hot water supply heat exchanger that heats water guided from a water supply passage and supplies hot water to the hot water supply passage, and a non-hot water supply side heat exchanger that heats a heat medium that is incorporated in the non-hot water supply side circulation passage and circulates through the non-hot water supply side circulation passage And a hot water supply heat exchanger and a non-hot water supply side heat exchanger are integrated, and a canner / two-channel hot water supply provided with a burner for heating the hot water supply heat exchanger and the non-hot water supply side heat exchanger in common A hot water supply heat exchanger for detecting the temperature of hot water in the hot water supply heat exchanger, and the hot water supply heat exchanger during non-hot water supply side independent operation in which only hot water supply side operation is performed without hot water supply. When the detected temperature detected by the hot water temperature detecting means becomes equal to or higher than the set temperature for stopping the burner combustion, the burner combustion is stopped, and the detected temperature of the hot water supply heat exchanger hot water temperature detecting means is the set temperature for restarting the burner combustion. Bar when It has a non-hot-water-supply-side islanding combustion control unit to restart the combustion over, the hot water at the time there is a hot state to the non-hot-water-supply-side islanding combustion control unit entailment hot water supply heat exchanger to the combustion and the combustion stop of the burner by The pattern of the hot water temperature change over time of the heat exchanger is given as reference data corresponding to the installation position of the hot water heat exchanger hot water temperature detecting means, and the hot water heat exchanger hot water temperature during the non-hot water supply side independent operation is given. Hot water supply heat exchange for detecting the absence of water in the hot water supply heat exchanger when the change over time of the detected temperature data detected by the detection means changes irregularly compared with the corresponding hot water temperature change pattern of the reference data. A can and two water channel water heater, characterized in that waterless detection means is provided.

A hot water supply heat exchanger that heats water guided from a water supply passage and supplies hot water to the hot water supply passage, and a non-hot water supply side heat exchanger that heats a heat medium that is incorporated in the non-hot water supply side circulation passage and circulates through the non-hot water supply side circulation passage And a hot water supply heat exchanger and a non-hot water supply side heat exchanger are integrated, and a canner / two-channel hot water supply provided with a burner for heating the hot water supply heat exchanger and the non-hot water supply side heat exchanger in common A hot water supply heat exchanger for detecting the temperature of hot water in the hot water supply heat exchanger, and the hot water supply heat exchanger during non-hot water supply side independent operation in which only hot water supply side operation is performed without hot water supply. When the detected temperature detected by the hot water temperature detecting means is equal to or higher than the off temperature, the combustion of the burner is stopped, and when the detected temperature of the hot water supply heat exchanger hot water temperature detecting means is equal to or lower than the set temperature at which burner combustion is resumed. Non-resuming burner combustion Has a hot water side islanding combustion control unit, the non-hot-water-supply-side islanding detection temperature detected by the hot water supply heat exchanger water temperature detecting means during the at which the temperature higher than the off temperature for stopping the burner combustion Hot water supply that detects the absence of water in the hot water heat exchanger when a predetermined reference temperature that is higher than the peak temperature of the hot water temperature in the hot water heat exchanger when hot water is in the hot water heat exchanger is reached One can two water channel water heater, characterized in that a means for detecting no heat exchange water is provided.

A non-hot-water supply side forced stop means for forcibly stopping the non-hot-water supply side operation when the absence of water in the hot-water supply heat exchanger is detected by the hot water supply no-hot water detection means is provided. The single can two-way water heater according to claim 1 or 2 .

A non-hot-water supply side operation abnormality notifying means for notifying the abnormality of the non-hot-water supply side operation is provided when the absence of hot water in the hot-water supply heat exchanger is detected by the no-hot-water hot water exchange detection means. Any one of Claims 1 to 3 is a single can two-way water heater.

Non-hot water supply that drives the circulation pump provided in the non-hot water supply side circulation passage when a non-hot water supply side operation instruction is given and immediately starts the burner combustion operation without detecting the flow of hot water in the non-hot water supply side circulation passage The canned two-way water heater according to any one of claims 1 to 4, wherein a side combustion forcible start means is provided.

The non-hot water supply side circulation passage is a reheating circulation passage, the non-hot water supply side heat exchanger is a reheating heat exchanger, the heat medium circulating in the reheating circulation passage is hot water, and the operation on the non-hot water supply side is a reheating bath. The can of two-way water heater according to any one of claims 1 to 5 , wherein the water heater is operated.