JPH05256515A - Hot water feeder and control method thereof - Google Patents
Hot water feeder and control method thereofInfo
- Publication number
- JPH05256515A JPH05256515A JP4055092A JP5509292A JPH05256515A JP H05256515 A JPH05256515 A JP H05256515A JP 4055092 A JP4055092 A JP 4055092A JP 5509292 A JP5509292 A JP 5509292A JP H05256515 A JPH05256515 A JP H05256515A
- Authority
- JP
- Japan
- Prior art keywords
- water
- amount
- temperature
- fuel
- hot water
- 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.)
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Landscapes
- Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Feedback Control In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、家庭用の給湯機及び給
湯付ふろ釜の制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a home water heater and a method for controlling a bath with hot water.
【０００２】[0002]
【従来の技術】図３に、従来の給湯機の基本構成を示
す。ここに示すように、給湯機は複数のバーナ１とバー
ナを収納するためのバーナ室２、燃焼室３、熱交換器
４、排気室５、及び送風機６で構成されている。燃料ガ
ス２１は、燃料流量調節弁１１を通り、マニホールド１
２へ導かれ、各バーナ１の内部へ噴射される。燃焼用空
気２２は送風機６により供給され、バーナ１に火炎２３
が形成されて完全燃焼する。燃焼により発生した高温の
燃焼ガス２４は熱交換器４に入り、水２６を加熱し、湯
２７にする。温度の低下した燃焼ガス２４は排ガス２５
となり、排気室５から外部へ放出される。ここで、熱交
換器４の水経路には、上流側に入水温度検出器７と水量
検出器８が、下流側には、出湯温度検出器９と水量制御
弁１０が設けられている。ここで、水量検出器８と水量
制御弁１０とは熱交換器４に対し、上流側にあるもの、
下流側にあるもの等があり限定されない。さらに、出湯
温度を設定するための温度設定器１３とこれらの信号に
基づいて、燃料流量調節弁１１と送風機６の送風機風量
調節器１４及び水量制御弁１０を駆動調節する為の信号
を出力する制御回路１５を備えている。2. Description of the Related Art FIG. 3 shows a basic structure of a conventional water heater. As shown here, the water heater comprises a plurality of burners 1, a burner chamber 2 for housing the burners, a combustion chamber 3, a heat exchanger 4, an exhaust chamber 5, and a blower 6. The fuel gas 21 passes through the fuel flow rate control valve 11 and passes through the manifold 1
2 and is injected into each burner 1. The combustion air 22 is supplied by the blower 6, and the burner 1 receives the flame 23.
Is formed and burns completely. The high temperature combustion gas 24 generated by the combustion enters the heat exchanger 4 and heats the water 26 into hot water 27. The combustion gas 24 whose temperature has dropped is the exhaust gas 25.
And is discharged from the exhaust chamber 5 to the outside. Here, the water path of the heat exchanger 4 is provided with an inlet water temperature detector 7 and a water amount detector 8 on the upstream side, and a hot water outlet temperature detector 9 and a water amount control valve 10 on the downstream side. Here, the water amount detector 8 and the water amount control valve 10 are located upstream of the heat exchanger 4,
There is something on the downstream side, and there is no limitation. Further, based on the temperature setting device 13 for setting the outlet heated water temperature and these signals, a signal for driving and adjusting the fuel flow rate control valve 11, the blower air flow rate controller 14 of the blower 6 and the water flow control valve 10 is output. The control circuit 15 is provided.
【０００３】このような構成の給湯機に用いられている
従来の制御方法を以下説明する。入水温度検出器７で検
出した入水温度と温度設定器１３で設定した設定温度と
の差に、水量検出器８で検出した水量を乗じた値に比例
した値であるフィードフォワード値により、必要な熱量
を求め、燃料量を決定すると共に、図４の空燃比設定図
に基づいて、その燃料量に対応した風量を決定し、それ
ぞれ、燃料流量調節弁１１と送風機６の送風機風量調節
器１４を調節する。さらに、設定温度に対し出湯温度が
一致しない場合には、設定温度と出湯温度との差に基づ
いて決定されるるフィードバック値により微調節が行わ
れる。また、給湯機の能力が最大燃焼状態であっても、
出湯温度が設定温度以下である場合には、水量制御弁１
０により水量を減少させて、出湯温度が設定温度になる
ように制御していた。A conventional control method used in a water heater having such a structure will be described below. The difference between the incoming water temperature detected by the incoming water temperature detector 7 and the set temperature set by the temperature setting device 13 is multiplied by the amount of water detected by the water amount detector 8 to obtain a feedforward value that is proportional to the required value. The heat quantity is obtained, the fuel quantity is determined, and the air flow rate corresponding to the fuel quantity is determined based on the air-fuel ratio setting diagram of FIG. 4, and the fuel flow rate control valve 11 and the blower air flow rate controller 14 of the blower 6 are respectively set. Adjust. Further, when the hot water outlet temperature does not match the set temperature, fine adjustment is performed by the feedback value determined based on the difference between the set temperature and the hot water outlet temperature. Also, even if the capacity of the water heater is in the maximum combustion state,
If the tap water temperature is below the set temperature, the water flow control valve 1
The amount of water was reduced to 0 to control the outlet heated water temperature to the set temperature.
【０００４】[0004]
【発明が解決しようとする課題】従来の制御方法では、
あるガス質の中で発熱量が高い燃料ガスの場合と、発熱
量が低い燃料ガスの場合で、実際に給湯機に入る熱量に
差が生じる。つまり、燃料流量調節弁１１の開度設定は
発熱量が低い燃料ガスに合わせて設定するため、発熱量
が高い燃料ガスの場合には、その給湯機の最大能力以上
の過剰入力が行われることになる。ここで、発熱量が高
い燃料ガスは燃焼性能が悪いため、燃焼用空気量が多く
必要となる。図４には、発熱量が高いガスと低いガスで
燃焼に必要な燃焼用空気量の関係も模式的に示してい
る。しかし、実際の給湯機の制御回路では、同一のガス
質の中で各燃料ガスの発熱量に合わせて、図４のような
複数の空燃比設定を行うことは不可能であり、１本の空
燃比設定しか出来ない。以下、ガス質ＬＰの場合、発熱
量が高いブタンと発熱量が低いプロパンとを例にとって
説明する。ブタンとプロパンでは、燃料流量調節弁１１
の開度が同一でも発熱量の違いにより、給湯機に入力さ
れる熱量はブタンの方が約１５％多くなる。例えば、給
湯機の最大能力が１６号の場合、プロパンでの入熱量は
３０，０００kcal/hであるのに対し、ブタンでは３３，
９００kcal/hとなる。即ち、ブタンの場合には１８号相
当の過剰入力となってしまう。そのため、最大時の燃焼
用空気量は、ブタンで３３，９００kcal/hの場合に必要
な量である図４の（イ）に設定することになる。つまり
空燃比の設定は、図４の（イ）を通る実線のように設定
する必要があるため、同一の燃料流量調節弁１１の開度
でプロパンの場合は（ロ）の風量で十分であるにもかか
わらず、（イ）の風量に設定されることになる。一般に
給湯機の騒音は入熱量と風量に支配されているため、従
来の制御方法では、ガス質ＬＰの場合にはブタンの最大
燃焼時に騒音レベルが最大となる。また、プロパンの場
合も燃焼に必要な風量（（ロ）の風量）に比べ、（イ）
の風量に設定されるので騒音レベルが高くなるという問
題があった。SUMMARY OF THE INVENTION In the conventional control method,
There is a difference in the amount of heat that actually enters the water heater between a fuel gas having a high calorific value and a fuel gas having a low calorific value in a certain gas quality. That is, since the opening degree of the fuel flow rate control valve 11 is set according to the fuel gas having a low calorific value, in the case of the fuel gas having a high calorific value, an excessive input exceeding the maximum capacity of the water heater is performed. become. Here, since the combustion performance of fuel gas having a high calorific value is poor, a large amount of combustion air is required. FIG. 4 also schematically shows the relationship between the amount of combustion air required for combustion with a gas having a high calorific value and a gas with a low calorific value. However, in the actual control circuit of the water heater, it is impossible to set a plurality of air-fuel ratios as shown in FIG. Only the air-fuel ratio can be set. In the case of the gas quality LP, butane having a high calorific value and propane having a low calorific value will be described below as examples. For butane and propane, the fuel flow rate control valve 11
Butane has the same amount of heat input to the water heater, but the amount of heat input to the hot water heater is about 15% higher. For example, when the maximum capacity of the water heater is 16, the heat input with propane is 30,000 kcal / h, while with butane it is 33,
It becomes 900 kcal / h. That is, in the case of butane, an excessive input corresponding to No. 18 will occur. Therefore, the maximum combustion air amount is set to (a) in FIG. 4, which is the amount required when the butane is 33,900 kcal / h. That is, since it is necessary to set the air-fuel ratio as shown by the solid line passing through (a) in FIG. 4, in the case of propane with the same opening of the fuel flow rate control valve 11, the air volume of (b) is sufficient. Nevertheless, the air volume will be set to (a). Generally, the noise of the water heater is governed by the heat input and the air flow, so that the conventional control method maximizes the noise level when the butane is maximally burned when the gas quality is LP. Also, in the case of propane, compared to the air volume required for combustion (the air volume in (b)), (a)
However, there is a problem that the noise level becomes high because it is set to the air flow rate.
【０００５】本発明は、あるガス質の中で、発熱量が高
い燃料ガスの場合でも発熱量が低い燃料ガスの場合で
も、給湯機への入熱量を同一として騒音が低減できる制
御方法を提供するものである。The present invention provides a control method capable of reducing noise with the same heat input to the water heater regardless of whether the fuel gas has a high calorific value or a low calorific value in a certain gas quality. To do.
【０００６】[0006]
【課題を解決するための手段】本発明はの給湯機は、熱
交換器を通過する水通路には、入水温度検出器と出湯温
度検出器及び水量検出器と水量制御弁を備え、バーナに
至る燃料ガス通路には燃料流量調節弁を備え、また、燃
焼用空気を供給するための送風機と送風機風量調節器を
備え、さらに、出湯温度を設定するための温度設定器及
びこれらの制御を行う制御回路を備えた給湯機におい
て、燃料量に対する風量の関係をある一定値までは燃料
量の増加と共に風量を増加させ、それ以上の燃料量に対
しては風量を一定にすると共に、設定温度と入水温度及
び水量とから求められるフィードフォワード値が、給湯
機の最大能力以上の場合には、そのフィードフォワード
値に基づいて、水量制御弁により給湯機の最大能力でそ
の設定温度が得られるまで、水量を絞り込む制御手段を
有することを特徴とする。The water heater of the present invention comprises a burner equipped with an inlet water temperature detector, an outlet water temperature detector, a water amount detector and a water amount control valve in a water passage passing through a heat exchanger. The fuel gas passage to reach is equipped with a fuel flow rate control valve, a blower for supplying combustion air and a blower air flow rate controller, and further, a temperature setter for setting the outlet heated water temperature and these controls. In a water heater equipped with a control circuit, the amount of air flow increases with increasing fuel amount until the amount of air flow has a constant value. If the feedforward value obtained from the incoming water temperature and water volume is greater than or equal to the maximum capacity of the water heater, the water temperature control valve can obtain the set temperature at the maximum capacity of the water heater based on the feedforward value. Until, characterized in that it has a control means to narrow the amount of water.
【０００７】[0007]
【実施例】図１に本発明の制御方法のブロック図を示
す。給湯機の構成は先に説明した図３と同じである。本
発明では、まず、従来例と同様に設定温度と入水温度と
水量に基づいて求められたフィードフォワード値によ
り、給湯機の最大能力（例えば、１６号の場合には３
０，０００kcal/hであり、ガス質ＬＰではプロパンの場
合もブタンの場合も同一である。）に対し、そのフィー
ドフォワード値がそれ以上であれば、最大能力で設定温
度となる水量にまで、水量制御弁１０により水量を減少
させると共に、フィードフォワード値に基づく信号によ
り、燃料流量調節弁１１と送風機６とを制御する。さら
に、出湯温度が設定温度に一致しない場合には、その偏
差に基づいたフィードバック値により、燃料流量調節弁
１１と送風機６とを制御する。また、この様にフィード
フォワード値により水量制御弁１０を駆動させると共
に、空燃比設定を図２のように設定することが本発明の
ポイントである。本発明の空燃比設定は、ある一定値ま
では燃料量の増加と共に風量を増加させ、それ以上の燃
料量に対しては、風量を一定にしている。本発明の制御
方法によれば、フィードフォワード値に基づいて水量を
調節するので、発熱量の高い燃料ガスが用いられた場合
には、出湯温度が設定温度以上となるため、フィードバ
ック値に基づいて燃料流量調節弁１１が絞られることに
なる。ここで、１６号給湯機でガス質ＬＰを例にとって
作用の詳細を説明する。この場合には、まずフィードフ
ォワード値に基づいて、その値が１６号以上相当であれ
ば、１６号相当の水量になるよう水量制御弁１０を閉方
向に駆動する。これは、実際の入熱量では３０，０００
kcal/hに相当する水量に絞られる訳であり、プロパンの
場合には、燃料量と風量とが図２の（Ａ）点に調節さ
れ、さらに設定温度と出湯温度の偏差に基づいたフィー
ドバック値により微調節される。また、ブタンの場合に
は、まずプロパンと同様（Ａ）の点に調節されるが、発
熱量が高いため、この状態では入熱量がプロパンに対し
約１５％多くなり、設定温度より出湯温度が高くなるの
で、フィードバック値により約１５％燃料量を少なく調
節することになる。結局、ブタンの場合は図２の（Ｂ）
点に調節される。また、ここでは空燃比の設定を燃料量
が（Ｂ）点以上では、風量が一定になるようにしている
ので、ブタンの最大燃焼は燃料量が（Ｂ）点、風量は最
大となり、プロパン最大燃焼では燃料量が（Ａ）点、風
量は最大となる。また、この空燃比の設定での最大風量
は、従来制御の値に対し約１５％少ないが、燃焼性が悪
いブタンは、燃料量が（Ｂ）点であるので、十分な燃焼
性能が得られる風量になっており、この風量であれば、
プロパンの（Ａ）点における燃焼性能に対しても、何ら
問題はない。1 is a block diagram of a control method according to the present invention. The structure of the water heater is the same as that of FIG. 3 described above. In the present invention, first, as in the conventional example, the maximum capacity of the water heater (for example, in the case of No. 16 is 3 by the feedforward value obtained based on the set temperature, the incoming water temperature, and the amount of water).
It is 50,000 kcal / h, which is the same for propane and butane for the gas quality LP. On the other hand, if the feedforward value is more than that, the water amount is reduced by the water amount control valve 10 up to the water amount that reaches the set temperature with the maximum capacity, and the fuel flow rate control valve 11 is supplied by the signal based on the feedforward value. And the blower 6 are controlled. Further, when the outlet heated water temperature does not match the set temperature, the fuel flow rate control valve 11 and the blower 6 are controlled by the feedback value based on the deviation. The point of the present invention is to drive the water amount control valve 10 by the feedforward value and set the air-fuel ratio as shown in FIG. According to the air-fuel ratio setting of the present invention, the air flow rate is increased with the increase of the fuel amount up to a certain fixed value, and the air flow rate is kept constant for the fuel amount higher than that. According to the control method of the present invention, since the amount of water is adjusted based on the feedforward value, when a fuel gas with a high calorific value is used, the outlet heated water temperature becomes equal to or higher than the set temperature, and therefore, based on the feedback value. The fuel flow rate control valve 11 is throttled. Here, the details of the operation will be described by taking the gas quality LP in the No. 16 water heater as an example. In this case, first, based on the feedforward value, if the value is equivalent to No. 16 or more, the water amount control valve 10 is driven in the closing direction so that the amount of water is equivalent to No. 16. This is 30,000 in actual heat input
This means that the amount of water is equivalent to kcal / h, and in the case of propane, the fuel amount and air amount are adjusted to point (A) in Fig. 2, and the feedback value based on the deviation between the set temperature and the tap water temperature. Fine-tuned by. Also, in the case of butane, first, it is adjusted to the point (A) similar to propane, but since the calorific value is high, the heat input amount is about 15% more than propane in this state, and the tapping temperature is higher than the set temperature. Since it becomes higher, the fuel amount is adjusted to be smaller by about 15% depending on the feedback value. After all, in the case of butane, (B) of FIG.
Adjusted to the point. Further, here, the air quantity is set so that the air quantity becomes constant when the fuel quantity is above the (B) point, so the maximum combustion of butane is the maximum fuel quantity at the (B) point, the maximum air quantity, and the propane maximum quantity. In combustion, the amount of fuel becomes the point (A) and the amount of air becomes maximum. Further, the maximum air volume at the setting of this air-fuel ratio is about 15% less than the value of the conventional control, but since the fuel amount is the point (B) for butane having poor combustibility, sufficient combustion performance can be obtained. It is the air volume, and if it is this air volume,
There is no problem with the combustion performance of propane at point (A).
【発明の効果】本発明の制御方法によれば、あるガス質
の中で発熱量が高い燃料が用いられた場合も、発熱量が
低い燃料が用いられた場合も、給湯機の最大能力は同一
となり、過剰入力が防止できると共に、風量を少なく設
定できるため、従来の制御方法に比べ、騒音レベルを低
くすることができる。例として、１６号給湯機のＬＰ仕
様の場合、従来の制御方式では、ブタン燃焼時に５０ｄ
Ｂ、プロパン燃焼時に４９ｄＢであったものが、本制御
の採用により、ブタン燃焼時、プロパン燃焼時共４５ｄ
Ｂとなり、大幅な騒音低減が可能である。EFFECTS OF THE INVENTION According to the control method of the present invention, the maximum capacity of the water heater can be obtained regardless of whether a fuel having a high calorific value in a certain gas quality is used or a fuel having a low calorific value is used. Since they are the same, excessive input can be prevented, and the air volume can be set to be small, so that the noise level can be lowered as compared with the conventional control method. As an example, in the case of the LP specification of the 16th water heater, the conventional control method causes 50d during butane combustion.
B and 49 dB at the time of propane combustion, but 45d both at the time of butane combustion and propane combustion by adopting this control
It becomes B, and it is possible to significantly reduce noise.
【図１】本発明の一実施例を説明するための制御手段の
ブロック線図である。FIG. 1 is a block diagram of control means for explaining an embodiment of the present invention.
【図２】本発明の一実施例の効果を説明するための空燃
比設定を示す線図である。FIG. 2 is a diagram showing an air-fuel ratio setting for explaining the effect of one embodiment of the present invention.
【図３】従来例の給湯機の基本構成を示すブロック図で
ある。FIG. 3 is a block diagram showing a basic configuration of a conventional water heater.
【図４】従来例の効果を説明するための空燃比設定を示
す線図である。FIG. 4 is a diagram showing the air-fuel ratio setting for explaining the effect of the conventional example.
１．バーナ ２．バーナ室 ３．燃焼室 ４．熱交換器 ５．排気室 ６．送風機 ７．入水温度検出器 ８．水量検出器 ９．出湯温度検出器 １０．水量制御弁 １１．燃料流量調節弁 １２．マニホール
ド １３．温度設定器 １４．送風機風量
調節器 １５．制御回路 ２１．燃料ガス ２２．燃焼用空気 ２３．火炎 ２４．燃焼ガス ２５．排ガス ２６．水 ２７．湯1. Burner 2. Burner room 3. Combustion chamber 4. Heat exchanger 5. Exhaust chamber 6. Blower 7. Water temperature detector 8. Water amount detector 9. Hot water temperature detector 10. Water flow control valve 11. Fuel flow control valve 12. Manifold 13. Temperature setter 14. Blower air flow controller 15. Control circuit 21. Fuel gas 22. Combustion air 23. Flame 24. Combustion gas 25. Exhaust gas 26. Water 27. Hot water
Claims (2)
検出器と出湯温度検出器及び水量検出器と水量制御弁を
備え、バーナに至る燃料ガス通路には燃料流量調節弁を
備え、また、燃焼用空気を供給するための送風機と送風
機風量調節器を備え、さらに、出湯温度を設定するため
の温度設定器及びこれらの制御を行う制御回路を備えた
給湯機において、燃料量に対する風量の関係をある一定
値までは燃料量の増加と共に風量を増加させ、それ以上
の燃料量に対しては風量を一定にすると共に、設定温度
と入水温度及び水量とから求められるフィードフォワー
ド値が、給湯機の最大能力以上の場合には、そのフィー
ドフォワード値に基づいて、水量制御弁により給湯機の
最大能力でその設定温度が得られるまで、水量を絞り込
む制御手段を有することを特徴とする給湯機。1. A water passage passing through the heat exchanger is provided with an inlet water temperature detector, an outlet hot water temperature detector, a water amount detector and a water amount control valve, and a fuel flow rate control valve is provided in a fuel gas passage leading to the burner. In addition, in a water heater provided with a blower for supplying combustion air and a blower air flow rate controller, and further provided with a temperature setter for setting the outlet heated water temperature and a control circuit for controlling these, The amount of air flow increases with the increase of fuel amount up to a certain fixed value, and the amount of air flow becomes constant for higher fuel amount, and the feedforward value calculated from the set temperature, the inlet temperature and the water amount is If the capacity of the water heater is higher than the maximum capacity, the water quantity control valve has a control means for narrowing the amount of water until the set temperature is obtained with the maximum capacity of the water heater based on the feedforward value. Water heater, characterized in that.
検出器と出湯温度検出器及び水量検出器と水量制御弁を
備え、バーナに至る燃料ガス通路には燃料流量調節弁を
備え、また、燃焼用空気を供給するための送風機と送風
機風量調節器を備え、さらに、出湯温度を設定するため
の温度設定器及びこれらの制御を行う制御回路を備えた
給湯機において、燃料量に対する風量の関係をある一定
値までは燃料量の増加と共に風量を増加させ、それ以上
の燃料量に対しては風量を一定にすると共に、設定温度
と入水温度及び水量とから求められるフィードフォワー
ド値が、給湯機の最大能力以上の場合には、そのフィー
ドフォワード値に基づいて、水量制御弁により給湯機の
最大能力でその設定温度が得られるまで、水量を絞り込
むことを特徴とする給湯機の制御方法。2. A water passage passing through the heat exchanger is provided with an inlet water temperature detector, an outlet hot water temperature detector, a water amount detector and a water amount control valve, and a fuel flow rate control valve is provided in a fuel gas passage leading to the burner. In addition, in a water heater provided with a blower for supplying combustion air and a blower air flow rate controller, and further provided with a temperature setter for setting the outlet heated water temperature and a control circuit for controlling these, The amount of air flow increases with the increase of fuel amount up to a certain fixed value, and the amount of air flow becomes constant for higher fuel amount, and the feedforward value calculated from the set temperature, the inlet temperature and the water amount is In the case where the water heater has the maximum capacity or more, the amount of water is narrowed down based on the feedforward value until the set temperature is obtained with the maximum capacity of the water heater by the water amount control valve. Method of controlling a water heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4055092A JPH05256515A (en) | 1992-03-13 | 1992-03-13 | Hot water feeder and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4055092A JPH05256515A (en) | 1992-03-13 | 1992-03-13 | Hot water feeder and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05256515A true JPH05256515A (en) | 1993-10-05 |
Family
ID=12989097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4055092A Pending JPH05256515A (en) | 1992-03-13 | 1992-03-13 | Hot water feeder and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05256515A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010090898A3 (en) * | 2009-02-03 | 2011-04-14 | Sridhar Deivasigamani | Apparatus and control method for a hybrid tankless water heater |
| US8971694B2 (en) | 2009-02-03 | 2015-03-03 | Intellihot Green Technologies, Inc. | Control method for a hybrid tankless water heater |
| KR20160082941A (en) | 2013-11-07 | 2016-07-11 | 세키스이가가쿠 고교가부시키가이샤 | Adhesive tape |
| US10247446B2 (en) | 2007-03-09 | 2019-04-02 | Lochinvar, Llc | Control system for modulating water heater |
-
1992
- 1992-03-13 JP JP4055092A patent/JPH05256515A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10247446B2 (en) | 2007-03-09 | 2019-04-02 | Lochinvar, Llc | Control system for modulating water heater |
| US10955169B2 (en) | 2007-03-09 | 2021-03-23 | Lochinvar, Llc | Control system for modulating water heater |
| WO2010090898A3 (en) * | 2009-02-03 | 2011-04-14 | Sridhar Deivasigamani | Apparatus and control method for a hybrid tankless water heater |
| US8498523B2 (en) | 2009-02-03 | 2013-07-30 | Intellihot, Inc. | Apparatus and control method for a hybrid tankless water heater |
| US8971694B2 (en) | 2009-02-03 | 2015-03-03 | Intellihot Green Technologies, Inc. | Control method for a hybrid tankless water heater |
| US9062895B2 (en) | 2009-02-03 | 2015-06-23 | Intellihot Green Technologies, Inc. | Gas control method for a hybrid tankless water heater |
| US9234679B2 (en) | 2009-02-03 | 2016-01-12 | Intellihot Green Technologies, Inc. | Apparatus and control method for a hybrid tankless water heater |
| KR20160082941A (en) | 2013-11-07 | 2016-07-11 | 세키스이가가쿠 고교가부시키가이샤 | Adhesive tape |
| KR20210125101A (en) | 2013-11-07 | 2021-10-15 | 세키스이가가쿠 고교가부시키가이샤 | Adhesive tape |
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