JPH06257853A - Operating method of water amount control valve for hot-water supplier - Google Patents
Operating method of water amount control valve for hot-water supplierInfo
- Publication number
- JPH06257853A JPH06257853A JP7101493A JP7101493A JPH06257853A JP H06257853 A JPH06257853 A JP H06257853A JP 7101493 A JP7101493 A JP 7101493A JP 7101493 A JP7101493 A JP 7101493A JP H06257853 A JPH06257853 A JP H06257853A
- Authority
- JP
- Japan
- Prior art keywords
- water
- amount
- hot water
- temperature
- hot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、再出湯時の湯温の安定
化を行う給湯器の水量制御弁動作方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a water quantity control valve of a water heater for stabilizing the hot water temperature when tapping hot water again.
【０００２】[0002]
【従来の技術】図７には、給湯器の一般的なシステム構
成が示されている。同図において、熱交換器２の入口側
には給水管３が接続されており、この給水管３には給水
温度を検出する入水サーミスタ10と、給水流量を検出す
る流量センサ９とが設けられている。熱交換器２の出口
側には給湯管４が接続され、この給湯管４の出口側には
給湯栓１が設けられている。さらに、給湯管４には水量
制御弁16と、出湯温度を検出する出湯サーミスタ11とが
設けられている。水量制御弁16は、同図に示す回転型の
バルブ方式のものや、上下移動型のシャフト方式のもの
があるが、何れも弁の開弁量を可変することにより熱交
換器２を通る水量を調節するものである。2. Description of the Related Art FIG. 7 shows a general system configuration of a water heater. In the figure, a water supply pipe 3 is connected to the inlet side of the heat exchanger 2, and a water supply thermistor 10 for detecting the water supply temperature and a flow rate sensor 9 for detecting the water supply flow rate are provided in the water supply pipe 3. ing. The hot water supply pipe 4 is connected to the outlet side of the heat exchanger 2, and the hot water supply tap 1 is provided on the outlet side of the hot water supply pipe 4. Further, the hot water supply pipe 4 is provided with a water amount control valve 16 and a hot water discharge thermistor 11 for detecting a hot water discharge temperature. The water amount control valve 16 includes a rotary type valve system shown in the same figure and a vertical moving type shaft type, but in each case, the amount of water passing through the heat exchanger 2 can be changed by changing the valve opening amount. Is to adjust.
【０００３】熱交換器２の下方にはバーナ７、バーナ７
の点火を行うイグナイタ電極18、着火を検知するフレー
ムロッド電極19、および給排気を行う燃焼ファン５が配
設されており、バーナ７のガス導入口にはガスノズル６
が対向配置され、このガスノズル６に通じるガス管８に
はガス供給量を開弁量によって制御するガス比例弁13
と、管路の開閉を行うガス電磁弁12とが介設されてい
る。Below the heat exchanger 2, a burner 7 and a burner 7 are provided.
An igniter electrode 18 for igniting the engine, a frame rod electrode 19 for detecting ignition, and a combustion fan 5 for supplying / exhausting air are provided, and a gas nozzle 6 is provided at a gas inlet of the burner 7.
Are arranged opposite to each other, and a gas proportional valve 13 for controlling the gas supply amount by the valve opening amount in the gas pipe 8 leading to the gas nozzle 6.
And a gas solenoid valve 12 for opening and closing the pipeline.
【０００４】この種の給湯器には制御装置14が備えられ
ており、この制御装置14にはリモコン15が接続され、こ
のリモコン15には給湯温度を設定するボタンや設定温度
の表示部が設けられている。制御装置14は給湯器の給湯
動作を制御しており、図６の（ａ），（ｂ）に示すよう
に、給湯栓１が開けられると流量センサ９が給水量を検
出して、その給水量がある一定以上（最低作動流量）に
なったときに流量センサ９からの信号を受けて制御装置
14は燃焼ファン５を回転させる。そして、燃焼ファン５
の回転が所定の回転領域に入ったときにガス比例弁13を
開けてバーナ７へガスの供給を行い、イグナイタ電極18
による点火動作を行う。フレームロッド電極19がガスの
着火を検出すると、制御装置14はＰＩＤ演算等により出
湯温度を設定温度にするようフィードバック制御を行
い、ガス比例弁13の開弁量を可変し、熱交換器２から出
る湯温の安定化制御を行う。This type of water heater is provided with a control device 14, and a remote controller 15 is connected to the control device 14. The remote controller 15 is provided with buttons for setting the hot water temperature and a display part for the set temperature. Has been. The controller 14 controls the hot water supply operation of the water heater. As shown in FIGS. 6 (a) and 6 (b), when the hot water tap 1 is opened, the flow sensor 9 detects the amount of water supplied, The controller receives a signal from the flow rate sensor 9 when the amount exceeds a certain level (minimum operating flow rate).
14 rotates the combustion fan 5. And the combustion fan 5
When the rotation of the igniter enters a predetermined rotation region, the gas proportional valve 13 is opened to supply the gas to the burner 7, and the igniter electrode 18
Ignition is performed. When the flame rod electrode 19 detects the ignition of the gas, the control device 14 performs feedback control such that the hot water discharge temperature is set to a set temperature by PID calculation or the like, and changes the valve opening amount of the gas proportional valve 13 to change from the heat exchanger 2. Stabilize the temperature of the hot water that comes out.
【０００５】そして、給湯栓１が閉められて流量センサ
９から制御装置14にオフ信号が加えられると、制御装置
14は燃焼加熱を停止して水量制御弁16を全開状態にし、
次の再出湯に備える。When the hot water tap 1 is closed and an OFF signal is applied from the flow sensor 9 to the control device 14, the control device is activated.
14 stops combustion heating and fully opens the water amount control valve 16,
Prepare for the next hot spring.
【０００６】しかし、断続的に湯を使用した場合、一旦
給湯栓１を閉めて、次に給湯栓１を開いて再出湯させる
と、最初は前回使用時の熱交換器２や給湯管４に残って
いた湯が出るので設定温度に近い温度の湯が出るが、次
に給湯栓１が開けられてから通常のフィードバック制御
が行われるまで時間を要し、しかも、水量制御弁16が全
開状態であるため、熱交換器２にはフィードバック制御
が行われるまでの間に多量の冷たい水が入り込むことと
なり、この多量の水を設定温度まで加熱するにはバーナ
７の火力が追いつかず、設定温度よりかなり低いぬるい
アンダーシュートの湯が出るという現象が起こる。した
がって、再出湯時には、最初は設定温度の湯が出て、次
にぬるい湯が出て、次に正常な設定温度の湯が出るとい
う冷水サンドイッチ現象が生じ、湯の使用者に不快感を
与えるという問題があった。However, when hot water is intermittently used, once the hot water tap 1 is closed, and then the hot water tap 1 is opened to re-open hot water, the heat exchanger 2 and the hot water supply pipe 4 used at the previous time are first used. The remaining hot water comes out, so hot water at a temperature close to the set temperature comes out, but it takes time from the next time the hot water tap 1 is opened until normal feedback control is performed, and the water volume control valve 16 is fully open. Therefore, a large amount of cold water will enter the heat exchanger 2 before the feedback control is performed, and the heating power of the burner 7 cannot catch up with heating the large amount of water to the set temperature. The phenomenon occurs that hot water with a much lower luke undershoot comes out. Therefore, at the time of re-releasing hot water, a cold water sandwich phenomenon occurs in which hot water at the set temperature first comes out, then lukewarm water comes out, and then hot water at the normal set temperature comes out, which causes the user of the hot water to feel uncomfortable. There was a problem.
【０００７】このような問題を解決するために、最近で
は、給湯栓１を閉めたときに水量制御弁16を全開状態に
してから一定量に絞った状態で次の出湯に備えて待機さ
せる方式のものが考えられている。この場合には、再出
湯させると、初めは前記のように前回使用時の給湯管４
や熱交換器２に残っていた湯が出るので設定温度に近い
湯が出て、次に、熱交換器２には水量制御弁16が絞った
状態であるので少量の水が入り込むため、この少量の水
は給湯栓１が開けられてから熱交換器２を出るまでの間
にフィードバック制御によって十分に設定温度まで加熱
されることとなる。したがって、再出湯時には前記の冷
水サンドイッチ現象のような湯温の変動がなくなり、湯
の使用者は不快感を感ずることなく、気持ちよく湯の使
用ができる。In order to solve such a problem, recently, when the hot water tap 1 is closed, the water amount control valve 16 is fully opened and then squeezed to a fixed amount to wait for the next hot water discharge. Things are being considered. In this case, when hot water is re-applied, the hot water supply pipe 4 at the time of previous use is initially set as described above.
And the hot water remaining in the heat exchanger 2 comes out, so hot water close to the set temperature comes out. Then, since the water quantity control valve 16 is squeezed into the heat exchanger 2, a small amount of water enters, so A small amount of water is sufficiently heated to the set temperature by feedback control between the time when the hot water tap 1 is opened and the time when it exits the heat exchanger 2. Therefore, when the hot water is again discharged, there is no change in the hot water temperature like the cold water sandwich phenomenon, and the user of the hot water can comfortably use the hot water without feeling any discomfort.
【０００８】[0008]
【発明が解決しようとする課題】このように、給湯栓１
を閉めたときに、水量制御弁16を全開位置から一定量に
絞った状態（固定絞り状態）で次の出湯に備えて待機さ
せる方式における水量制御弁16の再出湯時の動作が図５
に示されている。同図において、給湯栓１の開栓後、水
量制御弁16は常に一定時間（初期絞り時間）は固定絞り
状態を維持し、フィードバック制御が行われるようにな
っても暫時、水量制御弁16は固定絞り状態を維持してお
り、出湯温度が十分安定した後、水量制御弁16は燃焼能
力を最大に発揮するよう可変絞り制御に移行するように
している。As described above, the hot water tap 1
When the water flow control valve 16 is closed again, the operation of the water flow control valve 16 at the time of re-hot water discharge is shown in FIG.
Is shown in. In the figure, after opening the hot water tap 1, the water amount control valve 16 always maintains a fixed throttle state for a fixed time (initial throttle time), and even if feedback control is performed, The fixed throttle state is maintained, and after the outlet heated water temperature is sufficiently stabilized, the water amount control valve 16 shifts to the variable throttle control so as to maximize the combustion ability.
【０００９】しかしながら、同図に示すように、水量制
御弁16は給湯栓１が開けられてから一定の長い時間固定
絞り状態を維持しているので、湯の使用者にとって、こ
の一定時間内は大量の湯が使用したくとも使用できず不
便であった。このような不便を解消するために、フィー
ドバック制御が行われた直後に水量制御弁16を固定絞り
状態から可変絞り状態に移行する水量制御弁の動作方式
を採用することも考えられる。そうすれば、開栓後短い
時間で大量の湯が使用できるようになる。しかし、この
ようにすると、次に示すように入水温度の高低によって
出湯温度が変動するという新たな問題が生じる。However, as shown in the figure, the water amount control valve 16 maintains a fixed throttle state for a certain long time after the hot water tap 1 is opened. It was inconvenient because I could not use a large amount of hot water. In order to eliminate such inconvenience, it may be possible to adopt an operation method of the water amount control valve that shifts the water amount control valve 16 from the fixed throttle state to the variable throttle state immediately after the feedback control is performed. Then, a large amount of hot water can be used in a short time after opening the stopper. However, this causes a new problem that the hot water outlet temperature fluctuates depending on whether the incoming water temperature is high or low, as shown below.
【００１０】すなわち、給湯燃焼停止後に熱交換器２内
に残留する設定温度以上の湯量は、図３の（ａ），
（ｂ），（ｃ）に示すように、入水温度によって変化す
る。例えば、同図の（ａ）に示すように入水温度が高い
場合は、設定温度以上の熱交換器残留湯量Ａが多く、設
定温度より低い湯量Ｃが少い。また、同図の（ｃ）に示
すように、入水温度がかなり低い場合は、設定温度以上
の熱交換器残留湯量Ａが少くなり、設定温度より低い湯
量Ｃが多くなる。In other words, the amount of hot water remaining in the heat exchanger 2 above the set temperature after the hot water supply combustion is stopped is shown in FIG.
As shown in (b) and (c), it changes depending on the incoming water temperature. For example, when the incoming water temperature is high as shown in (a) of the same figure, the amount A of residual hot water in the heat exchanger above the set temperature is large, and the amount C of hot water below the set temperature is small. Further, as shown in (c) of the same figure, when the incoming water temperature is considerably low, the heat exchanger residual hot water amount A above the set temperature becomes small, and the hot water amount C lower than the set temperature becomes large.
【００１１】同図の（ｂ）の場合は、入水温度が同図の
（ａ）に示したものよりも低く、同図の（ｃ）に示した
ものよりも高くなっており、設定温度以上の熱交換器残
留湯量Ａは熱交換器２のＢ位置まで満たされていて、そ
の湯量は同図の（ａ）に示すものよりも少く、同図の
（ｃ）に示すものよりも多くなっている。再出湯時に、
この熱交換器２内のＢ位置まで満たされている設定温度
以上の湯Ａが熱交換器２から出終わる時点（排出時点）
で、丁度水量制御弁16が固定絞り状態から可変絞り制御
に移行するよう初期絞り時間が設定されていたとする。
この場合には、開栓後、排出時点までは水量制御弁16は
固定絞り状態であるため熱交換器２での火力は弱いので
設定温度以上の熱交換器残留湯量Ａはあまり加熱され
ず、出湯するので、湯温に大きなオーバーシュートは生
じない。湯Ａの排出時点を過ぎると、水量制御弁16は可
変絞り制御に移行するので、燃焼能力は最大に発揮され
熱交換器２に残留していた設定温度より低い湯量Ｃと、
開栓から排出時点までの間に熱交換器２に入り込んだ水
は素早く設定温度まで加熱されるため、出湯温度の変動
がない。したがって、図３の（ｂ）の場合の入水温のと
きは、湯Ａの排出時点と水量制御弁16の初期絞り時間経
過時点が一致しているため、出湯温度はアンダーシュー
トやオーバーシュートのほとんど生じない安定したもの
となる。In the case of (b) in the same figure, the water temperature is lower than that shown in (a) of the same figure and higher than that shown in (c) of the same figure, which is above the set temperature. The amount A of remaining hot water in the heat exchanger is filled up to the position B of the heat exchanger 2, and the amount of hot water is smaller than that shown in (a) of the same figure and larger than that shown in (c) of the same figure. ing. When the hot water is reapplied,
When hot water A having a temperature equal to or higher than the set temperature, which is filled up to the position B in the heat exchanger 2, finishes leaving the heat exchanger 2 (at the time of discharging)
Then, it is assumed that the initial throttle time is set so that the water flow control valve 16 just shifts from the fixed throttle state to the variable throttle control.
In this case, since the water amount control valve 16 is in a fixed throttle state until the time of discharge after opening the plug, the heat power in the heat exchanger 2 is weak, so the amount A of residual hot water in the heat exchanger above the set temperature is not heated so much. Since hot water is discharged, there is no large overshoot in the hot water temperature. After the discharge time of the hot water A, the water quantity control valve 16 shifts to the variable throttle control, so that the combustion capacity is maximized and the hot water quantity C is lower than the set temperature remaining in the heat exchanger 2,
Since the water that has entered the heat exchanger 2 is quickly heated to the set temperature from the time when the plug is opened to the time when it is discharged, there is no fluctuation in the hot water outlet temperature. Therefore, at the incoming water temperature in the case of FIG. 3 (b), the discharge time of the hot water A and the time point at which the initial throttle time of the water amount control valve 16 elapses coincide, so that the hot water discharge temperature is almost undershoot or overshoot. It will be stable and will not occur.
【００１２】しかしながら、同図の（ａ）のように入水
温度が高く、熱交換器２内に残留する設定温度以上の湯
量ＡがＡ１だけ多く満たされているときには、開栓後、
水量制御御弁16が固定絞り状態にある初期絞り時間まで
の間に熱交換器２に残留する設定温度以上の湯量Ａは熱
交換器２の出口からＢ位置までの部分が出湯するが、そ
の後、水量制御弁16は可変制御に移行し、Ｂ位置を越え
るＡ１部分の湯は強い火力で加熱されることになる。し
たがって、この場合にはＡ１部分の湯がオーバーシュー
トとなり、湯の使用者に不快感をあたえることになる。However, when the water temperature is high and the amount A of hot water remaining above the set temperature in the heat exchanger 2 is large by A1 as shown in FIG.
The amount of hot water A above the set temperature that remains in the heat exchanger 2 during the initial throttle time when the water amount control valve 16 is in the fixed throttle state is discharged from the outlet of the heat exchanger 2 to the position B, but thereafter. The water amount control valve 16 shifts to the variable control, and the hot water in the A1 portion that exceeds the B position is heated by a strong heating power. Therefore, in this case, the hot water in the A1 portion becomes an overshoot, which gives a discomfort to the user of the hot water.
【００１３】また、同図の（ｃ）のように、入水温度が
低い場合には、熱交換器２内に残留する設定温度以上の
湯量Ａは非常に少くなっており、この状態で再出湯の開
栓を行うと、水量制御弁16が固定絞り状態にある初期絞
り時間までの間に、熱交換器２に残留する設定温度より
低いＣ２部分が設定温度まで加熱されずに熱交換器２か
ら出ることになる。したがって、この場合にはＣ２部分
の冷たい湯がアンダーシュートとなり、前記同様に湯の
使用者に不快感を与えることになる。Further, as shown in (c) of the figure, when the incoming water temperature is low, the amount A of hot water remaining in the heat exchanger 2 above the set temperature is very small, and in this state the hot water is re-outflowed. When the plug is opened, the C2 portion lower than the preset temperature remaining in the heat exchanger 2 is not heated to the preset temperature until the initial throttle time in which the water amount control valve 16 is in the fixed throttle state, and the heat exchanger 2 is not heated. Will come out of. Therefore, in this case, the cold water in the portion C2 becomes an undershoot, which causes the user of the hot water to feel uncomfortable in the same manner as described above.
【００１４】本発明は上記従来の課題を解決するために
なされたものであり、その目的は、再出湯時に短い時間
で大量の湯が使用可能となり、さらに、入水温の高低に
かかわらず湯温が変動が小さく、オーバーシュートやア
ンダーシュートを小さく抑えることができる給湯器の水
量制御弁動作方法を提供することである。The present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to be able to use a large amount of hot water in a short time at the time of re-spouting hot water, and further to make the hot water temperature high or low. It is an object of the present invention to provide a method for operating a water amount control valve of a water heater, which has a small fluctuation and suppresses overshoot and undershoot.
【００１５】[0015]
【課題を解決するための手段】本発明は上記目的を達成
するために、次のように構成されている。すなわち、本
発明は、給湯器の給湯燃焼停止以後次の再出湯までの間
に、出湯水量を制御する水量制御弁を固定的に絞った状
態で待機させ、次の再出湯時に水量制御弁をこの固定の
絞り状態で所定時間出湯し、この所定の絞り時間が経過
したときに、水量制御弁を固定の絞り状態から可変絞り
制御に移行する給湯器の水量制御弁動作方法において、
給湯器を給湯燃焼停止させたときに熱交換器内に残留す
るほぼ設定温度以上となる湯量を入水温度に対する関係
データとして与えておき、給湯燃焼停止後次の再出湯時
に入水温と入水量を検出し、前記関係データに基づき検
出入水温に対応する設定温度以上の熱交換器残留湯量を
求め、さらに、入水量の検出に基づき前記設定温度の熱
交換器残留湯量が熱交換器から出きる基準排出時点を求
め、この基準排出時点又はこの基準排出時点の前後近傍
時点で水量制御弁を固定の絞り状態から可変絞り制御に
移行することを特徴としている。In order to achieve the above object, the present invention is constructed as follows. That is, the present invention waits in a state in which the water amount control valve for controlling the amount of tap water is fixedly squeezed between the stop of hot water supply combustion of the water heater and the next tapping hot water, and the water amount control valve is set at the time of tapping again next time. In this fixed throttle state, hot water is discharged for a predetermined time, and when this predetermined throttle time has elapsed, in the water quantity control valve operating method of the water heater, which shifts the water quantity control valve from the fixed throttle state to the variable throttle control,
The amount of hot water remaining in the heat exchanger above the set temperature when the hot water supply is stopped is given as the relational data for the incoming water temperature. The amount of residual hot water in the heat exchanger above the set temperature corresponding to the detected incoming water temperature is detected based on the above-mentioned relational data, and the amount of residual hot water in the heat exchanger at the set temperature comes out of the heat exchanger based on the detection of the incoming water amount. It is characterized in that the standard discharge time is obtained, and the water amount control valve is changed from the fixed throttle state to the variable throttle control at the standard discharge time or in the vicinity of this standard discharge time.
【００１６】[0016]
【作用】再出湯時に入水温と入水量が検出され、この検
出入水温と関係データ（給湯燃焼停止したとき熱交換器
内に残留する設定温度以上の湯量と入水温度の関係を示
したデータ）とから給湯燃焼停止時に熱交換器内に残留
する設定温度以上となる湯量を求める。さらに、検出入
水量に基づき、前記設定温度の熱交換器残留湯量が熱交
換器から出終わる時を基準排出時点として求める。この
基準排出時点又はこの基準排出時点の前後近傍時点で水
量制御弁は固定絞り状態から可変絞り制御に移行する。[Function] The incoming water temperature and the incoming water amount are detected at the time of re-hot water, and the detected incoming water temperature and related data (data showing the relationship between the amount of hot water remaining above the set temperature in the heat exchanger and the incoming water temperature when hot water supply combustion is stopped) From this, the amount of hot water that remains above the set temperature in the heat exchanger when hot water combustion is stopped is determined. Further, based on the detected amount of water input, the time when the amount of residual hot water in the heat exchanger at the set temperature ends from the heat exchanger is determined as the reference discharge time. The water amount control valve shifts from the fixed throttle state to the variable throttle control at the time of this standard discharge or in the vicinity of this standard discharge time.
【００１７】したがって、開栓後、基準排出時点までの
間に設定温度以上の熱交換器残留湯量があまり加熱され
ないまま出湯するので出湯温度は設定温度付近を保ち、
大きなオーバーシュートを生じることがない。また、基
準排出時点を過ぎると水量制御弁は可変絞り制御に移行
するので、熱交換器での燃焼能力は最大に発揮され熱交
換器に残留していた設定温度より低い湯量と開栓後基準
排出時点までの間に入り込んだ水は設定温度まで加熱さ
れるため、出湯温度にほとんどアンダーシュートを生じ
ることがなく、再出湯時の湯温変動が制御される。Therefore, since the hot water remaining in the heat exchanger above the set temperature is not heated so much after the plug is opened up to the reference discharge time, the hot water temperature is kept near the set temperature.
No big overshoot. In addition, since the water flow control valve shifts to variable throttle control after the standard discharge time, the combustion capacity in the heat exchanger is maximized and the amount of hot water lower than the set temperature remaining in the heat exchanger and the standard after opening the tap Since the water that has entered up to the point of discharge is heated to the set temperature, the hot water temperature hardly causes undershoot, and fluctuations in hot water temperature at the time of hot water discharge are controlled.
【００１８】[0018]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。なお、本実施例における給湯器システムは図７に
示すものと同様であり、従来例と同一の名称部分には同
一符号を付し、その重複説明は省略する。Embodiments of the present invention will be described below with reference to the drawings. The water heater system in the present embodiment is the same as that shown in FIG. 7, and the same names as those in the conventional example are designated by the same reference numerals, and the duplicate description thereof will be omitted.
【００１９】図１には、本発明に係る給湯器の水量制御
弁動作方法を行う初期絞り時間制御部30のブロック構成
図が示されている。初期絞り時間制御部30は制御装置14
内に形成されており、入水検出部25と、基準排出時点設
定部26と、データ格納部27と、水量制御弁駆動部29と、
複数のタイマ28とを有して構成されている。FIG. 1 is a block diagram of an initial throttle time control unit 30 for carrying out the method for operating a water amount control valve of a water heater according to the present invention. The initial aperture time control unit 30 is the control device 14
It is formed in the inside, the water input detection unit 25, the reference discharge time setting unit 26, the data storage unit 27, the water amount control valve drive unit 29,
It is configured to have a plurality of timers 28.
【００２０】入水検出部25は、給湯栓１が開けられて、
流量センサ９から流量検出信号が加えられたとき、所定
時間タイマ28を動作させ、そのタイマ時間内において流
量センサ９からの検出流量を積算し、その積算値を検出
入水量として検出する。その一方で、入水サーミスタ10
により入水温を検出し、これら、検出入水量と検出入水
温を基準排出時点設定部26に加える。When the hot water tap 1 is opened,
When a flow rate detection signal is applied from the flow rate sensor 9, the timer 28 is operated for a predetermined time, the detected flow rate from the flow rate sensor 9 is integrated within the timer time, and the integrated value is detected as the detected water input amount. On the other hand, water thermistor 10
The input water temperature is detected by, and the detected water input amount and the detected water input temperature are added to the reference discharge time setting unit 26.
【００２１】一方、データ格納部27には、図２に示すよ
うな給湯燃焼停止後に熱交換器２内に残留するほぼ設定
温度（本明細書中でほぼ設定温度という言葉は設定温度
に対して±３℃の範囲も含む概念で用いる）以上の湯量
Ａと入水温度との関係を示した関係データが実験等によ
り求められ、グラフデータの形で記憶されている。On the other hand, in the data storage unit 27, almost the set temperature that remains in the heat exchanger 2 after the hot water supply combustion is stopped as shown in FIG. 2 (in this specification, the term "set temperature" refers to the set temperature). The relational data showing the relation between the amount A of hot water and the temperature of the incoming water above is used by the experiment etc. and is stored in the form of graph data.
【００２２】基準排出時点設定部26には、演算回路が形
成されており、基準排出時点設定部26では、まず、デー
タ格納部27に格納されている関係データを用いて、入水
検出部25から受けた検出入水温に基づき熱交換器２内に
残留する設定温度以上の湯量を求める。例えば、検出入
水温がＴN （℃）のとき、設定温度以上の熱交換器残留
湯量はＡN （cc）となる。設定温度以上の熱交換器残留
湯温Ａ（Ａ＝ＡN ）が熱交換器２から出終わる時点を基
準排出時点ｔK として検出入水量Ｒに基づき、例えば、
ＴK ＝Ｒ／ＡN のように演算によって求める。そして、
この基準排出時点ｔK をデータ格納部27に記憶する。An arithmetic circuit is formed in the reference discharge time point setting unit 26, and the reference discharge time point setting unit 26 first uses the relational data stored in the data storage unit 27 from the water intrusion detection unit 25. The amount of hot water remaining in the heat exchanger 2 equal to or higher than the set temperature is calculated based on the detected incoming water temperature. For example, when the detected incoming water temperature is T N (° C.), the amount of residual hot water in the heat exchanger above the set temperature is A N (cc). Based on the detected water amount R as the reference discharge time t K , the time when the heat exchanger residual hot water temperature A (A = A N ) above the set temperature ends from the heat exchanger 2,
Calculated as T K = R / A N. And
The reference discharge time t K is stored in the data storage unit 27.
【００２３】水量制御弁駆動部29では、給湯栓１が開栓
されて、流量センサ９からオン信号を受けたときを起点
としてデータ格納部27に記憶されている基準排出時点ま
でタイマ28を動作させ、このタイマ動作期間内では水量
制御弁16の開弁量を一定量に絞った固定絞り状態を維持
し、タイマ28からタイムアップ信号が出たときに水量制
御弁16は固定絞り状態から、燃焼能力を最大に発揮する
よう可変絞り制御に移行する。In the water amount control valve drive unit 29, the timer 28 is operated until the reference discharge time stored in the data storage unit 27 starting from the time when the hot water tap 1 is opened and the ON signal is received from the flow rate sensor 9. Then, within this timer operation period, the fixed amount of opening of the water control valve 16 is maintained at a fixed throttle state, and when the time-up signal is output from the timer 28, the water amount control valve 16 is released from the fixed throttle state. Shift to variable throttle control to maximize combustion performance.
【００２４】本実施例によれば、再出湯時の入水温度か
ら関係データを用いて熱交換器２内の設定温度以上の湯
量が求められ、この設定温度以上の湯量と検出入水量と
により、この設定温度以上の湯量が熱交換器２より出終
わる時点が基準排出時点として求められ、この基準排出
時点を境に水量制御弁16は固定絞り状態から可変絞り制
御へと移行する。つまり、給湯栓１が開栓されて流量セ
ンサ９がオン信号を発してから前記基準排出時点までに
熱交換器２内に残留していた設定温度以上の湯量Ａは強
く加熱されないまま熱交換器２から出終わることになる
ので、出湯温度は設定温度付近を保ち大きなオーバーシ
ュートを生じることがない。次に、基準排出時点を過ぎ
ると水量制御弁16は燃焼能力を最大に発揮するよう可変
制御に移行するため、熱交換器２内に残留していた設定
温度より低い湯と開栓後基準排出時点までの間に熱交換
器に入り込んだ水は、設定温度まで素早く加熱されるの
で、出湯温度にほとんどアンダーシュートを生じること
がない。したがって、本実施例によれば、再出湯時の出
湯温度は常に設定温度を保ちアンダーシュートやオーバ
ーシュートのほとんどない安定した湯温の湯を出湯する
ことができる。According to the present embodiment, the amount of hot water above the set temperature in the heat exchanger 2 is obtained from the incoming water temperature at the time of re-leaving hot water, and the amount of hot water above the set temperature and the detected incoming water amount The time when the amount of hot water above the set temperature ends from the heat exchanger 2 is determined as the standard discharge time, and the water quantity control valve 16 shifts from the fixed throttle state to the variable throttle control after the reference discharge time. That is, the hot water amount A above the set temperature, which remains in the heat exchanger 2 from the time when the hot water tap 1 is opened and the flow rate sensor 9 outputs the ON signal to the time when the reference discharge occurs, is not strongly heated but remains in the heat exchanger. Since the discharge is finished from 2, the hot water discharge temperature is kept around the set temperature and a large overshoot does not occur. Next, after the reference discharge time passes, the water amount control valve 16 shifts to a variable control so that the combustion capacity is maximized, so hot water lower than the set temperature remaining in the heat exchanger 2 and the reference discharge after opening. Since the water that has entered the heat exchanger up to that point is quickly heated to the set temperature, there is almost no undershoot in the tap water temperature. Therefore, according to the present embodiment, it is possible to constantly discharge the hot water at the time of hot-water discharge at the set temperature and to stably discharge hot water with almost no undershoot or overshoot.
【００２５】また、従来では、再出湯時には水量制御弁
16が常に一定の長い時間は固定絞り状態であったため、
この一定時間は大量の湯が使用できず不便であったが、
本実施例では熱交換器２に残留する設定温度以上の湯量
が熱交換器２を出終わる基準排出時点を過ぎれば、水量
制御弁16が可変絞り制御へと移行し、開栓後短い時間で
大量の湯の使用が可能となるので、湯の使用者にとって
便利なものとなる。Further, in the past, the water amount control valve was used when tapping hot water again.
Since 16 was always in a fixed aperture for a long time,
It was inconvenient to use a large amount of hot water for a certain period of time, but
In this embodiment, when the amount of hot water remaining in the heat exchanger 2 equal to or higher than the set temperature exceeds the reference discharge time point at which the heat exchanger 2 is discharged, the water amount control valve 16 shifts to the variable throttle control, and in a short time after opening the cap. A large amount of hot water can be used, which is convenient for users of hot water.
【００２６】なお、本発明は上記実施例に限定されるこ
となく様々な実施の態様を採り得る。例えば、上記実施
例では基準排出時点を境に水量制御弁16の固定絞り状態
から可変絞り制御への移行を行ったが、基準排出時点の
前後近傍時点で固定絞り状態から可変絞り制御へ移行す
るようにしてもよい。The present invention is not limited to the above-mentioned embodiments, and various embodiments can be adopted. For example, in the above-mentioned embodiment, the fixed throttle state of the water amount control valve 16 is changed to the variable throttle control at the time of the reference discharge time, but the fixed throttle state is changed to the variable throttle control in the vicinity of before and after the reference discharge time. You may do it.
【００２７】さらに、給湯器のシステム構成は図７に示
すものに限定されない。Further, the system configuration of the water heater is not limited to that shown in FIG.
【００２８】さらに、水量制御弁16は、バルブ方式やシ
ャフト方式のギアモータを用いたものに限定されるもの
ではなく、その他の種類のものでもよい。Further, the water quantity control valve 16 is not limited to the one using a valve type or shaft type gear motor, but may be other types.
【００２９】さらに、上記実施例では、給湯燃焼停止後
に熱交換器２に残留する設定温度以上の湯量Ａと入水温
度との関係を図２に示すようなグラフデータで与えたが
表データ、演算データ（演算式）等で与えてもよい。例
えば、演算式で与える場合には、入水温度Ｔが０℃のと
きに熱交換器２に残留する設定温度以上の湯量をＡ0と
したとき、Ａ＝ａＴ＋Ａ0 （ａは定数）として与えられ
る。また、給湯燃焼停止後に給湯器に残留する設定温度
より低い湯量Ｃは、入水温度Ｔの関数Ｗ（Ｔ）として表
すこともでき、熱交換器２の入口から出口までの全容量
をＱとしたとき、設定温度以上の残留湯量を、Ａ＝Ｑ−
Ｗ（Ｔ）として与えることもできる。Further, in the above embodiment, the relationship between the amount of hot water A remaining above the set temperature and the incoming water temperature in the heat exchanger 2 after the hot water supply combustion is stopped is given by the graph data as shown in FIG. It may be given by data (calculation formula) or the like. For example, when given by an arithmetic expression, when the amount of hot water above the set temperature remaining in the heat exchanger 2 when the incoming water temperature T is 0 ° C. is A 0 , it is given as A = aT + A 0 (a is a constant). . Further, the amount C of hot water that remains below the set temperature in the water heater after the hot water combustion is stopped can also be expressed as a function W (T) of the incoming water temperature T, and the total capacity from the inlet to the outlet of the heat exchanger 2 is Q. At this time, the amount of residual hot water above the set temperature is
It can also be given as W (T).
【００３０】さらに、上記実施例では、給湯燃焼停止後
に熱交換器２に残留する設定温度以上の湯量Ａを入水温
度と残留湯量Ａとの関係を示す関係データを用いて求め
たが、以下に示す点を考慮に入れると、より正確な残留
湯量Ａを求めることができる。Further, in the above embodiment, the amount A of hot water remaining in the heat exchanger 2 after the combustion of the hot water supply was stopped was found using the relational data showing the relationship between the incoming water temperature and the amount A of remaining hot water. If the points shown are taken into consideration, a more accurate residual hot water amount A can be obtained.
【００３１】第１は、燃焼停止後、再出湯時までの待機
時間を考慮するものである。すなわち、給湯燃焼停止時
に設定温度以上であった熱交換器２内の残留湯量Ａの湯
温は、給湯燃焼停止後に図４に示すように変化する。同
図に示すように、燃焼停止後の後沸き（燃焼停止後、熱
交換器２に保有されている熱量が熱交換器２に残留して
いる湯に伝わって湯温が設定温度以上に上昇する現象）
によって、熱交換器２内の湯量Ａは設定温度以上に上昇
し、ｔ1 時点でピークとなり、その後、自然放熱により
湯温は低下していき、ｔ2 時点を過ぎると湯温は設定温
度以下に下がる。つまり、燃焼停止後、ｔ1 時点を含む
Ｅ期間で熱交換器２内の残留湯量Ａは最も多くなり、ｔ
2 時点を過ぎるＧ期間では、残留湯量Ａは時間の経過と
ともに減っていく。したがって、燃焼停止後の経過時間
を例えば四区分したＤ，Ｅ，Ｆ，Ｇ期間毎に、これらの
期間における残留湯量Ａとの相関係数を実験や演算等か
ら待機時間相関データとして求めることにより、残留湯
量Ａをより正確に求められる。First, the waiting time after the combustion is stopped and before the hot water is re-exposed is taken into consideration. That is, the hot water temperature of the residual hot water amount A in the heat exchanger 2 which is equal to or higher than the set temperature when the hot water supply combustion is stopped changes as shown in FIG. 4 after the hot water supply combustion is stopped. As shown in the figure, after-boiling after combustion is stopped (after combustion is stopped, the amount of heat retained in the heat exchanger 2 is transferred to the hot water remaining in the heat exchanger 2 and the hot water temperature rises above the set temperature. Phenomenon)
As a result, the amount A of hot water in the heat exchanger 2 rises above the set temperature, reaches a peak at time t 1 , and then the temperature of the hot water decreases due to natural heat dissipation. After the time t 2, the temperature of the hot water falls below the set temperature. Go down to. That is, after the combustion is stopped, the amount A of residual hot water in the heat exchanger 2 becomes the maximum during the period E including the time t 1 ,
In the G period after the 2nd time point, the residual hot water amount A decreases with the passage of time. Therefore, for each of the D, E, F, and G periods in which the elapsed time after the combustion stop is divided into four, for example, the correlation coefficient with the residual hot water amount A in these periods is obtained as standby time correlation data from experiments and calculations. The residual hot water amount A can be obtained more accurately.
【００３２】第２は、燃焼ファン５のポストパージ期間
（給湯燃焼停止後も引き続き燃焼ファン５を回転してい
る期間）における回転速度を考慮するものである。つま
り、燃焼ファン５の回転速度が速いほど湯は冷やされて
設定温度上の残留湯量Ａは減るので、この回転速度と残
留湯量Ａとの関係を前記同様実験や演算等により求めて
おくと、より正確に残留湯量Ａは求められる。Secondly, the rotational speed of the combustion fan 5 during the post-purge period (the period during which the combustion fan 5 continues to rotate after the hot-water supply combustion is stopped) is taken into consideration. That is, as the rotation speed of the combustion fan 5 is faster, the hot water is cooled and the residual hot water amount A at the set temperature is reduced. Therefore, if the relationship between the rotary speed and the residual hot water amount A is obtained by the same experiment or calculation as described above, The residual hot water amount A can be obtained more accurately.
【００３３】第３は、給湯器の外周囲温度（環境温度）
を考慮するものである。環境温度が低ければ当然湯量の
低下率も大きいので、前記同様、実験や演算により環境
温度と残留湯量Ａの相関係数を求めておけば、より正確
に残留湯量Ａが求められる。環境温度は外気温を検出す
る外気サーミスタを給湯器に配設することによって検出
することができる。Third, the ambient temperature of the water heater (environmental temperature)
Is to be considered. If the environmental temperature is low, the rate of decrease in the amount of hot water is naturally large. Therefore, if the correlation coefficient between the environmental temperature and the amount A of residual hot water is obtained by experiments or calculations, the amount A of residual hot water can be obtained more accurately. The ambient temperature can be detected by disposing an outside air thermistor for detecting the outside air temperature in the water heater.
【００３４】このように、入水温度の他に、再出湯待機
時間と周囲温度およびポストパージ期間における燃焼フ
ァン５の回転速度等を、残留湯量Ａを求める条件に加え
ることにより、より正確な残留湯量Ａを求めることがで
きる。したがって、このように得られた残留湯量Ａと検
出入水量より求められる基準排出時点は一層正確なもの
となり、出湯温度にアンダーシュートが生じないよう水
量制御弁16のより精巧な制御が行われることとなる。As described above, in addition to the incoming water temperature, the re-outlet hot water standby time, the ambient temperature, the rotation speed of the combustion fan 5 in the post-purge period, etc. are added to the condition for obtaining the residual hot water amount A, so as to obtain a more accurate residual hot water amount. You can ask for A. Therefore, the reference discharge time point obtained from the residual hot water amount A and the detected incoming water amount obtained in this way becomes more accurate, and more precise control of the water amount control valve 16 is performed so that undershoot does not occur in the hot water outlet temperature. Becomes
【００３５】[0035]
【発明の効果】本発明は、再出湯時に入水温と入水量を
検出して、この入水温のときに熱交換器に残留する設定
温度以上の湯量が熱交換器から出終わる時点としての基
準排出時点を求め、開栓から基準排出時点に至るまでは
水量制御弁は固定絞り状態となっているので、熱交換器
内の設定温度以上の湯量は強く加熱されないまま出湯さ
れるため、出湯温度に大きなオーバーシュートが起こら
ない。また、基準排出時点を過ぎれば水量制御弁は燃焼
能力を最大に発揮するよう可変制御に移行するので、熱
交換器内の設定温度より低い湯や水は設定温度まで素早
く加熱されるため、出湯温度にほとんどアンダーシュー
トは生じない。したがって、本発明によれば、入水温に
かかわらず再出湯時の湯温は安定しており、湯の使用者
は不快な思いをすることなく気持ちよく使用できる。EFFECT OF THE INVENTION The present invention detects the incoming water temperature and the incoming water amount at the time of re-opening hot water, and at the time of this incoming water temperature, it is the standard as the time when the amount of hot water remaining in the heat exchanger above the set temperature ends from the heat exchanger. Since the water amount control valve is in a fixed throttle state from the time when the discharge time is calculated to the time when the standard discharge time is reached, the amount of hot water above the set temperature in the heat exchanger is discharged without being strongly heated. No big overshoot. Also, after the standard discharge time, the water volume control valve shifts to variable control so that the combustion capacity is maximized, so hot water or water below the set temperature in the heat exchanger is quickly heated to the set temperature. Almost no undershoot occurs in temperature. Therefore, according to the present invention, the hot water temperature at the time of returning hot water is stable regardless of the hot water temperature, and the hot water user can comfortably use the hot water without feeling uncomfortable.
【００３６】さらに、従来では、開栓後、一定の長い時
間にわたって水量制御弁は固定絞り状態であったため大
量の湯が使用できなかったが、本発明では、熱交換器か
ら設定温度以上の残留湯量が出終わる基準排出時点を過
ぎれば水量制御弁は可変絞り制御に移行するので、開栓
後短い時間で大量の湯が使用できるようになる。Further, in the past, a large amount of hot water could not be used because the water amount control valve was in a fixed throttle state for a certain long time after opening the plug. However, in the present invention, the heat exchanger remains above the set temperature. Since the water amount control valve shifts to the variable throttle control after the reference discharge time at which the amount of hot water has been discharged, a large amount of hot water can be used within a short time after opening.
【図１】本発明に係る給湯器の水量制御弁動作方法を行
う一実施例のブロック構成図である。FIG. 1 is a block diagram of an embodiment of a method for operating a water amount control valve of a water heater according to the present invention.
【図２】同実施例に用いられる基本データを示すグラフ
である。FIG. 2 is a graph showing basic data used in the same example.
【図３】給湯燃焼停止時の入水温度に対する熱交換器内
の設定温度以上の湯量の関係を示す説明図である。FIG. 3 is an explanatory diagram showing a relationship of an amount of hot water equal to or higher than a set temperature in the heat exchanger with respect to an incoming water temperature when hot water supply combustion is stopped.
【図４】給湯燃焼停止後の熱交換器内の湯温の経時変化
を示すグラフである。FIG. 4 is a graph showing changes with time in hot water temperature in the heat exchanger after the hot water supply combustion is stopped.
【図５】ガス量の経時変化と水量制御弁の動作を示す説
明図である。FIG. 5 is an explanatory diagram showing changes over time in the gas amount and the operation of the water amount control valve.
【図６】流水量と出湯温度との経時変化を示すグラフで
ある。FIG. 6 is a graph showing changes over time in the amount of flowing water and the temperature of discharged hot water.
【図７】給湯器のシステムを示す構成図である。FIG. 7 is a configuration diagram showing a system of a water heater.
２ 熱交換器 16 水量制御弁 2 Heat exchanger 16 Water flow control valve
───────────────────────────────────────────────────── フロントページの続き (72)発明者 林 均 神奈川県大和市深見台３丁目４番地 株式 会社ガスター内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Hayashi, 3-4 Fukamidai, Yamato City, Kanagawa Prefecture, inside Gaster Co., Ltd.
Claims (1)
での間に、出湯水量を制御する水量制御弁を固定的に絞
った状態で待機させ、次の再出湯時に水量制御弁をこの
固定の絞り状態で所定時間出湯し、この所定の絞り時間
が経過したときに、水量制御弁を固定の絞り状態から可
変絞り制御に移行する給湯器の水量制御弁動作方法にお
いて、給湯器を給湯燃焼停止させたときに熱交換器内に
残留するほぼ設定温度以上となる湯量を入水温度に対す
る関係データとして与えておき、給湯燃焼停止後次の再
出湯時に入水温と入水量を検出し、前記関係データに基
づき検出入水温に対応する設定温度以上の熱交換器残留
湯量を求め、さらに、入水量の検出に基づき前記設定温
度の熱交換器残留湯量が熱交換器から出きる基準排出時
点を求め、この基準排出時点又はこの基準排出時点の前
後近傍時点で水量制御弁を固定の絞り状態から可変絞り
制御に移行する給湯器の水量制御弁動作方法。1. A water amount control valve for controlling the amount of water discharged from the water heater after the combustion stop of hot water supply until the next re-hot water is kept on standby in a fixed state, and the water amount control valve is turned on at the time of the next re-hot water discharge. In a method of operating a water quantity control valve of a water heater, in which hot water is discharged in a fixed throttle state for a predetermined time, and when the predetermined throttle time elapses, the water quantity control valve shifts from a fixed throttle state to a variable throttle control. The amount of hot water remaining in the heat exchanger above the preset temperature when the combustion is stopped is given as relational data with respect to the incoming water temperature, and the incoming water temperature and the incoming water amount are detected at the time of the next re-opening of hot water after the hot water supply is stopped. The amount of residual hot water in the heat exchanger above the set temperature corresponding to the detected incoming water temperature is calculated based on the relevant data, and based on the detection of the amount of incoming water, the standard discharge time at which the amount of residual hot water in the heat exchanger at the set temperature comes out of the heat exchanger Seeking this standard A method for operating a water amount control valve of a water heater, which shifts the water amount control valve from a fixed throttle state to a variable throttle control at the time of discharge or near the time before and after this standard discharge time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7101493A JPH06257853A (en) | 1993-03-05 | 1993-03-05 | Operating method of water amount control valve for hot-water supplier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7101493A JPH06257853A (en) | 1993-03-05 | 1993-03-05 | Operating method of water amount control valve for hot-water supplier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06257853A true JPH06257853A (en) | 1994-09-16 |
Family
ID=13448236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7101493A Pending JPH06257853A (en) | 1993-03-05 | 1993-03-05 | Operating method of water amount control valve for hot-water supplier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06257853A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009270730A (en) * | 2008-04-30 | 2009-11-19 | Gastar Corp | Combustion device |
-
1993
- 1993-03-05 JP JP7101493A patent/JPH06257853A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009270730A (en) * | 2008-04-30 | 2009-11-19 | Gastar Corp | Combustion device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2689797B2 (en) | Instant hot water heater | |
| JPS60245947A (en) | Hot-water supply control device | |
| JPH06257853A (en) | Operating method of water amount control valve for hot-water supplier | |
| JPS6144111Y2 (en) | ||
| JP3308349B2 (en) | Initial water flow correction setting method of water flow control valve in water heater | |
| JP3315209B2 (en) | Control method of rising water amount at the time of re-water supply in water heater | |
| JPH06272960A (en) | Setting method for learning initial water flow rate at water flow control valve in hot-water apparatus | |
| JPH074741A (en) | Method for setting initial water quantity of water flow rate control valve in hot water supply system | |
| JPH025988B2 (en) | ||
| JPH06257855A (en) | Initial water flow rate setting method of water amount control valve in hot-water supplier | |
| JP3240929B2 (en) | Water heater | |
| JP3776959B2 (en) | Water heater | |
| JPH01208653A (en) | Feed hot water controller | |
| JPH0123072Y2 (en) | ||
| JP3240203B2 (en) | Water heater and its combustion control method | |
| JP3834352B2 (en) | Combined water heater | |
| JP2603425Y2 (en) | Water heater | |
| JPS6123251Y2 (en) | ||
| JPS6220465B2 (en) | ||
| JP3754494B2 (en) | Combustion equipment | |
| JPH1026412A (en) | Hot water feeding device | |
| JPH051826A (en) | Hot-water supply apparatus with improved performance of re-delivery of hot-water | |
| JPH07180908A (en) | Method and apparatus for controlling reoutput hot water temperature of hot water supplying apparatus | |
| JPH07151380A (en) | Hot water temperature controlling method for hot water supplying apparatus | |
| JPH0317466A (en) | Protecting method for water quantity regulator upon freezing for automatic control hot water supplying apparatus |