JP6320226B2

JP6320226B2 - Water heater

Info

Publication number: JP6320226B2
Application number: JP2014155266A
Authority: JP
Inventors: 中西　渉; 渉中西
Original assignee: 株式会社パロマ
Priority date: 2014-07-30
Filing date: 2014-07-30
Publication date: 2018-05-09
Anticipated expiration: 2034-07-30
Also published as: JP2016031219A

Description

本発明は、給湯装置に関するものである。 The present invention relates to a hot water supply apparatus.

従来から提供されている給湯装置は、バーナの燃焼により生じる燃焼熱と熱交換を行う熱交換器を備えており、熱交換器で加熱された水を外部に供給するように構成されている。具体的には、外部から水を取り込むための入水管において通水開始を検知し、その検知をトリガとしてバーナの燃焼運転を行う方式のものが提供されており、このような方式により、通水開始に伴う自動的な給湯を可能としている。 Conventionally provided hot water supply apparatuses include a heat exchanger that exchanges heat with combustion heat generated by combustion of a burner, and are configured to supply water heated by the heat exchanger to the outside. Specifically, there is provided a method for detecting the start of water flow in a water intake pipe for taking in water from the outside, and performing the burner combustion operation using the detection as a trigger. Automatic hot water supply at the start is possible.

特開２００８−１５１４７３号公報JP 2008-151473 A

ところで、この種の給湯装置では、周囲温度が低下した環境下において、装置内での通水停止がある程度長い時間継続した場合に、給湯器内に残存した水が凍結する虞がある。このように給湯器内に残留した水が凍結すると、内部配管等に破損が生じるという問題や、通水検知をトリガとする自動的な燃焼制御ができなくなるという問題など、凍結に起因する問題が生じる。従って、この種の給湯装置では、このような問題に対処するための凍結対策が求められる。 By the way, in this type of hot water supply apparatus, there is a possibility that water remaining in the water heater will freeze if the stop of water flow in the apparatus continues for a long time in an environment where the ambient temperature is lowered. In this way, when water remaining in the water heater is frozen, there are problems caused by freezing, such as problems such as damage to internal piping and the like, and automatic combustion control triggered by water flow detection becomes impossible. Arise. Therefore, in this type of hot water supply apparatus, a countermeasure against freezing for coping with such a problem is required.

凍結対策がなされた技術としては、例えば特許文献１のような技術が存在する。この特許文献１で開示される温水装置では、外気温が所定温度以下まで下がった場合にヒータをオン動作させて伝熱管を加熱することで解氷を試み、伝熱管内での凍結を抑制している。しかしながら、この技術では、凍結が発生した場合、凍結状態が完全に解消するまでの間、相当の時間をかけて電気ヒータを作動させ続ける必要があり、電力消費が非常に大きくなるという問題がある。 As a technique for taking measures against freezing, for example, there is a technique as disclosed in Patent Document 1. In the hot water device disclosed in Patent Document 1, when the outside air temperature falls to a predetermined temperature or lower, the heater is turned on to heat the heat transfer tube and attempt to defrost, thereby suppressing freezing in the heat transfer tube. ing. However, in this technique, when freezing occurs, it is necessary to continue operating the electric heater over a considerable period of time until the frozen state is completely eliminated, and there is a problem that power consumption becomes very large. .

一方、別の凍結対策としては、給湯装置内の水を外部に排出するための水抜き栓を設ける方法が挙げられる。しかしながら、このように水抜き栓によって給湯装置内の水を排出するためには、給湯装置内の配管の径をある程度大きくする必要があり、配管の拡径に起因する不利益（例えば、給湯器の構成の大幅な設計変更など）を被る虞がある。また、熱交換器では、燃焼ガス中の熱量を効率的に内部通水に伝達するために、熱交換器を構成する水管の径をより小さくすることが求められる。そして、このように細径化が求められる水管では、水抜き栓によって水管内の水を抜こうとしても完全に除去しきれずに水が残留する可能性が高くなるため、残留水の凍結によって細い水管につまりが生じる虞がある。このように、水抜き栓を設けるだけでは、残留水に起因する問題（水管の破損や燃焼運転の阻害などの問題）を解消することが難しい。 On the other hand, as another countermeasure against freezing, there is a method of providing a drain plug for discharging the water in the hot water supply apparatus to the outside. However, in order to discharge the water in the hot water supply apparatus by the drain plug in this way, it is necessary to increase the diameter of the pipe in the hot water supply apparatus to some extent, which is disadvantageous due to the expanded diameter of the pipe (for example, a water heater There is a risk of undergoing a major design change in the configuration of Further, in the heat exchanger, in order to efficiently transmit the amount of heat in the combustion gas to the internal water flow, it is required to make the diameter of the water pipe constituting the heat exchanger smaller. And, in such a water pipe that is required to be reduced in diameter, there is a high possibility that water will remain without being completely removed even if it is attempted to drain the water in the water pipe with a drain plug. There is a risk of clogging in the water pipe. Thus, it is difficult to solve problems caused by residual water (problems such as damage to water pipes and obstruction of combustion operation) only by providing a drain plug.

本発明は、上述した課題を解決するためになされたものであり、熱交換器で加熱された水を外部に供給するように構成された給湯装置において、消費電力の増大を抑えつつより短時間で解氷を行うことが可能な構成を提供することを目的とする。 The present invention has been made in order to solve the above-described problem, and in a hot water supply apparatus configured to supply water heated by a heat exchanger to the outside, the increase in power consumption is suppressed in a shorter time. It is an object to provide a configuration capable of performing ice melting in the above.

本発明は、ガスバーナと、
水入口からの水が流れ込む経路として構成される入水管と、
湯出口へ湯を送り出す経路として構成される出湯管と、
前記入水管と前記出湯管との間の通水経路として構成された伝熱管を備え、前記伝熱管内を通る水に対して前記ガスバーナで発生した燃焼熱を伝熱して熱交換させる熱交換器と、
前記入水管と前記出湯管とに接続され、前記熱交換器とは異なる通水経路として構成されたバイパス路と、
前記バイパス路を、少なくとも所定の閉塞状態と前記閉塞状態よりも開度を増大させた状態とに移行可能なバイパス弁と、
前記入水管内の通水を検知する通水センサと、
前記バイパス弁及び前記ガスバーナを制御する制御部と、
を備え、
前記制御部は、
前記通水センサが前記入水管内の通水を検知していない非検知状態から前記入水管内の通水を検知した検知状態に変化した通水開始を条件として、前記バイパス路を前記閉塞状態とする構成であり、
前記入水管での通水開始に伴う前記閉塞状態のときに前記通水センサが前記検知状態となる場合に、前記ガスバーナを燃焼状態とする所定の通常燃焼制御を行い、且つ前記ガスバーナの燃焼を停止させて前記通常燃焼制御を終えた後には前記バイパス路を開放状態としておき、
前記入水管での通水開始に伴う前記閉塞状態のときに前記通水センサが前記非検知状態となる場合には、前記バイパス路を開放する開放制御を行い、且つ前記ガスバーナを燃焼させると共に所定の終了条件が成立するまで前記ガスバーナの燃焼状態を継続する凍結解除燃焼制御を行うことを特徴とする。 The present invention comprises a gas burner,
A water inlet pipe configured as a path through which water flows from the water inlet;
A tapping pipe configured as a path for sending hot water to the hot water outlet;
A heat exchanger comprising a heat transfer pipe configured as a water passage between the water inlet pipe and the hot water outlet pipe, and transferring heat by transferring heat of combustion generated in the gas burner to water passing through the heat transfer pipe When,
A bypass path connected to the water inlet pipe and the hot water outlet pipe and configured as a water flow path different from the heat exchanger;
A bypass valve capable of shifting the bypass path to at least a predetermined closed state and a state in which the opening degree is increased more than the closed state;
A water flow sensor for detecting water flow in the water intake pipe;
A control unit for controlling the bypass valve and the gas burner;
With
The controller is
On the condition that the water flow sensor has changed from a non-detected state in which water flow in the water intake pipe is not detected to a detection state in which water flow in the water intake pipe is detected, the bypass path is in the blocked state. And the configuration
When the water flow sensor is in the detection state when the water flow is started in the water intake pipe, predetermined normal combustion control is performed so that the gas burner is in a combustion state, and combustion of the gas burner is performed. After stopping and finishing the normal combustion control, the bypass path is left open,
When the water flow sensor is in the non-detection state when the water flow is started in the water intake pipe, opening control for opening the bypass path is performed, the gas burner is burned, and a predetermined value is set. The freeze release combustion control is performed to continue the combustion state of the gas burner until the end condition is satisfied.

請求項１の発明は、入水管での通水開始に伴ってバイパス路が閉塞状態とされているときに通水センサが検知状態となる場合に、ガスバーナを燃焼状態とする所定の通常燃焼制御を行い、且つガスバーナの燃焼を停止させて通常燃焼制御を終えた後にはバイパス路を開放状態としておく構成となっている。
このように、入水管での通水開始に伴ってバイパス路が閉塞状態とされているときに通水センサが検知状態となる場合、熱交換器の通水経路での通水が確保されていると考えられる。このような場合には、特別な凍結解除運転を行うことなくガスバーナを燃焼状態とする通常燃焼制御を行うことで、通常の給湯動作を速やかに行うことができる。また、通常燃焼制御が終了した後には、バイパス路を開放状態としておくことができるため、器具が使用されない状態では水抜きを行いやすくしておくことができる。
一方、入水管での通水開始に伴ってバイパス路が閉塞状態とされているときに通水センサが非検知状態となる場合、バイパス路を開放する開放制御を行い、且つガスバーナを燃焼させると共に所定の終了条件が成立するまでガスバーナの燃焼状態を継続する凍結解除燃焼制御を行う。
バイパス路が閉塞状態とされているときに通水センサが非検知状態となる場合、熱交換器の通水経路で「つまり」が生じている可能性が高い。このような場合にバイパス路の通水を確保しつつガスバーナの燃焼によって熱交換器付近を加熱すれば、「つまり」の原因が凍結であった場合に、多大な電力消費を伴うことなくより短時間で解氷を行うことができる。しかも、この構成では、燃焼動作によって凍結対策を図ることができるため、凍結対策のために熱交換器付近の配管径の大型化を強いることもない。 According to the first aspect of the present invention, the predetermined normal combustion control is performed so that the gas burner is in a combustion state when the water passage sensor is in a detection state when the bypass passage is in a closed state with the start of water passage through the water intake pipe. In addition, after the combustion of the gas burner is stopped and the normal combustion control is finished, the bypass path is opened.
In this way, when the water flow sensor is in the detection state when the bypass path is closed with the start of water flow through the water intake pipe, water flow in the water flow path of the heat exchanger is ensured. It is thought that there is. In such a case, normal hot water supply operation can be quickly performed by performing normal combustion control in which the gas burner is in a combustion state without performing a special freeze release operation. In addition, after the normal combustion control is completed, the bypass path can be opened, so that water can be easily drained when the instrument is not used.
On the other hand, when the water passage sensor is in a non-detection state when the bypass passage is closed with the start of water passage through the water intake pipe, the opening control for opening the bypass passage is performed, and the gas burner is burned. Freeze release combustion control is performed in which the combustion state of the gas burner is continued until a predetermined end condition is satisfied.
When the water flow sensor is in a non-detection state when the bypass path is closed, there is a high possibility that “that is” occurs in the water flow path of the heat exchanger. In such a case, if the vicinity of the heat exchanger is heated by combustion of the gas burner while ensuring the water flow of the bypass passage, if the cause of “clogging” is freezing, it is shorter without much power consumption. The ice can be melted in time. In addition, in this configuration, since it is possible to take measures against freezing by the combustion operation, it is not necessary to increase the pipe diameter in the vicinity of the heat exchanger in order to prevent freezing.

請求項２の発明では、制御部は、入水管での通水開始に伴うバイパス路の閉塞状態のときに通水センサが非検知状態となる場合、開放制御によるバイパス路の開放状態において通水センサが検知状態となることを条件として凍結解除燃焼制御を行う構成となっている。
このように、熱交換器の「つまり」が想定される場合に、更にバイパス路を開放して通水の有無を確認すれば、その際の機器の状況がより詳細に把握されることになり、機器の状況により適した対応につなげやすくなる。 In the invention of claim 2, when the water passage sensor is in a non-detection state when the bypass passage is closed when the water passage is started in the water inlet pipe, the control portion passes water in the open state of the bypass passage by the opening control. The freeze-release combustion control is performed on condition that the sensor is in a detection state.
In this way, when the heat exchanger is supposed to be “that is”, if the bypass path is further opened and the presence or absence of water flow is confirmed, the status of the equipment at that time will be grasped in more detail. This makes it easier to connect to a response that is more appropriate for the situation of the device.

請求項３の発明では、制御部は、凍結解除燃焼制御が実行された後から所定時間が経過するまでの間に熱交換器の下流側の通水経路内の温度が第１温度以上上昇しない場合、凍結解除燃焼制御を停止させる構成となっている。
このように、凍結解除燃焼制御を行っても熱交換器の下流側の通水経路内の温度が第１温度以上上昇しない場合、「つまり」の原因が凍結ではなく他の要因（スケールや異物など）の可能性が高いため、それ以上燃焼を行っても「つまり」を解消できない可能性が高い。よって、このような場合に凍結解除燃焼制御を停止する構成とすれば、不必要の可能性が高い燃焼動作をより速やかに停止することができる。 In the invention of claim 3, the controller does not raise the temperature in the water flow path on the downstream side of the heat exchanger more than the first temperature until a predetermined time elapses after the freeze release combustion control is executed. In this case, the freeze release combustion control is stopped.
Thus, if the temperature in the water flow path on the downstream side of the heat exchanger does not rise above the first temperature even after performing the freeze release combustion control, the cause of “that is” is not freezing but other factors (scale or foreign matter) Etc.), there is a high possibility that “clogging” cannot be resolved even if combustion is performed further. Therefore, if it is set as the structure which stops freezing cancellation | release combustion control in such a case, the combustion operation | movement with a high possibility of unnecessary can be stopped more rapidly.

請求項４の発明は、凍結解除燃焼制御が実行された後から所定時間が経過するまでの間に熱交換器の下流側の通水経路内の温度が第１温度以上上昇しないことを条件として所定のエラー報知を行う報知部を有する。
このように、凍結解除燃焼制御を行っても熱交換器の下流側の通水経路内の温度が第１温度以上上昇しない場合、熱交換器の「つまり」の原因が凍結ではなく他の要因（スケールや異物など）と考えられるため、このような場合にその旨を報知すれば、報知を受けた主体がより迅速に適切な対応をとりやすくなる。 The invention according to claim 4 is provided on the condition that the temperature in the water flow path on the downstream side of the heat exchanger does not rise above the first temperature until a predetermined time has elapsed after execution of the freeze release combustion control. A notification unit that performs predetermined error notification is provided.
As described above, when the temperature in the water flow path on the downstream side of the heat exchanger does not increase by the first temperature or more even after performing the freeze release combustion control, the cause of the heat exchanger “that is” is not freezing but other factors. (Scaling, foreign matter, etc.), so in such a case, if the fact is notified, the subject who has received the notification can take an appropriate action more quickly.

請求項５の発明では、制御部は、凍結解除燃焼制御の実行中に熱交換器の下流側の通水経路内の温度が所定温度に達した場合、凍結解除燃焼制御を停止させる構成となっている。
このように、凍結解除燃焼制御の実行中に熱交換器の下流側の通水経路内の温度が所定温度に達した場合、凍結が解除されて所期の目的が達成された可能性が高い。従って、このような場合には、それ以上の燃焼を停止させることで、水が加熱されすぎることを防ぐことができる。 In the invention of claim 5, the control unit is configured to stop the freeze release combustion control when the temperature in the water passage on the downstream side of the heat exchanger reaches a predetermined temperature during execution of the freeze release combustion control. ing.
As described above, when the temperature in the water flow path on the downstream side of the heat exchanger reaches a predetermined temperature during execution of the freeze release combustion control, it is highly possible that the intended purpose has been achieved by releasing the freeze. . Therefore, in such a case, it is possible to prevent water from being heated too much by stopping further combustion.

図１は、本発明の第１実施形態に係る給湯装置を例示する風呂・給湯システムの概略回路図である。FIG. 1 is a schematic circuit diagram of a bath / hot water system illustrating a hot water supply apparatus according to the first embodiment of the present invention. 図２は、図１の風呂・給湯システムにおける給湯回路での制御の流れを例示するフローチャートである。FIG. 2 is a flowchart illustrating a control flow in the hot water supply circuit in the bath / hot water system of FIG. 1.

[第１実施形態]
以下、本発明を具現化した第１実施形態について、図面を参照して説明する。
図１で示す風呂・給湯システム１は、本発明に係る給湯装置の一例に相当し、主として、給湯回路２と風呂回路３とによって構成されている。給湯回路２は、主として、水入口１６からの水が流れ込む経路として構成される入水管１２と、湯出口１８へ湯を送り出す経路として構成される出湯管１０と、ガスバーナ（給湯バーナ）４からの燃焼熱を交換する一次熱交換器７及び二次熱交換器８からなる熱交換器６とを備えており、水道水を加熱し出湯させる経路として機能する。また、風呂回路３は、ガスバーナ５４（風呂バーナ）、風呂一次熱交換器５７、風呂二次熱交換器５８などをそれぞれ備えており、風呂の追い炊き等に利用されるものである [First embodiment]
Hereinafter, a first embodiment embodying the present invention will be described with reference to the drawings.
A bath / hot water system 1 shown in FIG. 1 corresponds to an example of a hot water supply apparatus according to the present invention, and is mainly composed of a hot water supply circuit 2 and a bath circuit 3. The hot water supply circuit 2 mainly includes a water inlet pipe 12 configured as a path through which water from the water inlet 16 flows, a hot water outlet pipe 10 configured as a path for sending hot water to the hot water outlet 18, and a gas burner (hot water burner) 4. A heat exchanger 6 including a primary heat exchanger 7 and a secondary heat exchanger 8 for exchanging combustion heat is provided, and functions as a path for heating tap water to discharge hot water. The bath circuit 3 includes a gas burner 54 (a bath burner), a bath primary heat exchanger 57, a bath secondary heat exchanger 58, and the like, and is used for reheating a bath.

給湯回路２では、二次熱交換器８の入口に、水道水を供給する構成で入水管１２が接続されており、この入水管１２には、管内の通水を検出する通水センサ３４（給湯水量センサ）が設けられている。入水管１２の下流側には、二次熱交換器８の伝熱管８ａが接続されており、その下流側には、二次熱交換器８の伝熱管８ａと一次熱交換器７の伝熱管７ａとを連結する通水管２０が接続される。更に、この通水管２０に連結された構成で一次熱交換器７の伝熱管７ａが接続され、一次熱交換器７の出口には、一次熱交換器７で加熱された湯を出湯する構成で出湯管１０が接続されている。この出湯管１０には、管内の水の温度を検出するサーミスタ２６が設けられている。 In the hot water supply circuit 2, a water inlet pipe 12 is connected to the inlet of the secondary heat exchanger 8 so as to supply tap water. The water inlet pipe 12 has a water passage sensor 34 (for detecting water passage in the pipe). A hot water supply amount sensor) is provided. A heat transfer tube 8 a of the secondary heat exchanger 8 is connected to the downstream side of the water intake pipe 12, and a heat transfer tube 8 a of the secondary heat exchanger 8 and a heat transfer tube of the primary heat exchanger 7 are connected to the downstream side thereof. The water flow pipe 20 which connects 7a is connected. Further, the heat transfer pipe 7a of the primary heat exchanger 7 is connected in a configuration connected to the water pipe 20, and the hot water heated by the primary heat exchanger 7 is discharged to the outlet of the primary heat exchanger 7. A tap pipe 10 is connected. The hot water discharge pipe 10 is provided with a thermistor 26 that detects the temperature of water in the pipe.

また、給湯燃焼室９０内において、一次熱交換器７はガスバーナ４の燃焼排気経路の上流側に配置され、二次熱交換器８は燃焼排気経路の下流側に配置されている。一次熱交換器７は、一次熱交換器７内の通水経路となる伝熱管７ａを備えており、伝熱管７ａ内を通る水に対してガスバーナ４で発生した燃焼排気に含まれる燃焼熱を伝熱して熱交換する。また、二次熱交換器８は、二次熱交換器８内の通水経路となる伝熱管８ａを備えており、伝熱管８ａ内を通る水に対してガスバーナ４で発生した燃焼排気に含まれる燃焼熱を伝熱して熱交換する。 Further, in the hot water combustion chamber 90, the primary heat exchanger 7 is disposed on the upstream side of the combustion exhaust path of the gas burner 4, and the secondary heat exchanger 8 is disposed on the downstream side of the combustion exhaust path. The primary heat exchanger 7 includes a heat transfer tube 7a serving as a water passage in the primary heat exchanger 7, and the combustion heat contained in the combustion exhaust generated by the gas burner 4 with respect to the water passing through the heat transfer tube 7a. Heat transfer and heat exchange. Further, the secondary heat exchanger 8 includes a heat transfer tube 8a serving as a water passage in the secondary heat exchanger 8, and is included in the combustion exhaust generated by the gas burner 4 with respect to the water passing through the heat transfer tube 8a. The heat of combustion generated is transferred to exchange heat.

また、入水管１２と出湯管１０との間をバイパスする通水経路として、熱交換器６とは異なる通水経路として構成されたバイパス路１４が設けられている。そして、このバイパス路１４には、バイパス路１４の通水を遮断した閉塞状態と、この閉塞状態よりも開度を増大させた開放状態とに移行可能なバイパス弁３２が設けられている。なお、バイパス弁３２は、バイパス路１４を閉塞状態と全開状態の２段階に切り替える構成であってもよく、バイパス路１４を閉塞状態と全開状態との間で、様々な開度に連続的に変更できる構成であってもよい。 In addition, a bypass path 14 configured as a water flow path different from the heat exchanger 6 is provided as a water flow path that bypasses between the water inlet pipe 12 and the hot water discharge pipe 10. The bypass passage 14 is provided with a bypass valve 32 that can shift between a closed state in which water flow through the bypass passage 14 is blocked and an open state in which the opening degree is larger than the closed state. Note that the bypass valve 32 may be configured to switch the bypass passage 14 in two stages, that is, a closed state and a fully open state, and the bypass passage 14 is continuously opened at various opening degrees between the closed state and the fully opened state. The structure which can be changed may be sufficient.

入水管１２において、バイパス路１４が連結する分岐位置よりも上流側には、通水量制御弁３３が設けられている。この通水量制御弁３３は、コントローラ２２からの指示を受けて駆動軸の回転角度が制御されるモータを備えており、入水管１２を閉塞状態と全開状態との間で様々な開度に連続的に変更できる構成となっている。 In the water inlet pipe 12, a water flow rate control valve 33 is provided upstream of the branch position where the bypass path 14 is connected. The water flow rate control valve 33 includes a motor that receives an instruction from the controller 22 and controls the rotation angle of the drive shaft, and continuously opens the water inlet pipe 12 at various degrees of opening between a closed state and a fully opened state. It can be changed automatically.

ガスバーナ４へのガスの供給を行うガス管４０には、上流側からガス元電磁弁４２、給湯ガス比例制御弁４４、各ガスバーナ４への分岐管ごとの給湯切替電磁弁４６，４６・・が夫々設けられている。また、給湯燃焼室９０の下方には、燃焼用空気を各ガスバーナ４（給湯バーナ）及びガスバーナ５４（風呂バーナ）へ供給するファン４８が設けられている。 The gas pipe 40 that supplies the gas to the gas burner 4 includes a gas source solenoid valve 42, a hot water supply gas proportional control valve 44, and hot water supply switching solenoid valves 46, 46,... For each branch pipe to each gas burner 4 from the upstream side. Each is provided. A fan 48 is provided below the hot water combustion chamber 90 to supply combustion air to each gas burner 4 (hot water burner) and gas burner 54 (bath burner).

風呂回路３は、戻り配管６６と、往き配管６８と、風呂熱交換器５６（風呂一次熱交換器５７、風呂二次熱交換器５８）とを備えた構成となっている。戻り配管６６は、風呂二次熱交換器５８と浴槽６０との間に配置されており、この戻り配管６６の経路には、循環ポンプ６２及び風呂サーミスタ６５が設けられている。また、往き配管６８は、風呂一次熱交換器５７と浴槽６０との間に配置されており、この往き配管６８の経路には、風呂サーミスタ６５が設けられている。更に、戻り配管６６には、出湯管１０から分岐された落とし込み管７０が接続されており、この落とし込み管７０には、給湯用電磁弁７２及び落とし込み水量センサ７４が設けられている。そして、落とし込み管７０に設けられた給湯用電磁弁７２を開弁させることで、給湯回路２で加熱された湯を浴槽６０へ供給可能となっている。また、ガスバーナ５４（風呂バーナ）に接続されるガス管からの分岐管には、切替電磁弁５３が設けられている。 The bath circuit 3 includes a return pipe 66, an outgoing pipe 68, and a bath heat exchanger 56 (a bath primary heat exchanger 57 and a bath secondary heat exchanger 58). The return pipe 66 is disposed between the bath secondary heat exchanger 58 and the bathtub 60, and a circulation pump 62 and a bath thermistor 65 are provided on the path of the return pipe 66. Further, the forward piping 68 is disposed between the bath primary heat exchanger 57 and the bathtub 60, and a bath thermistor 65 is provided in the path of the forward piping 68. In addition, a drop pipe 70 branched from the hot water pipe 10 is connected to the return pipe 66, and a hot water solenoid valve 72 and a drop water amount sensor 74 are provided in the drop pipe 70. The hot water heated by the hot water supply circuit 2 can be supplied to the bathtub 60 by opening the hot water supply solenoid valve 72 provided in the dropping pipe 70. A switching solenoid valve 53 is provided in a branch pipe from the gas pipe connected to the gas burner 54 (bath burner).

ここで、風呂・給湯システム１での給湯動作について図２等を参照して説明する。本構成では、図１で示すように制御回路としてのコントローラ２２が設けられ、このコントローラ２２が主体的に動作することで図２に示す制御が行われるようになっている。 Here, the hot water supply operation in the bath / hot water supply system 1 will be described with reference to FIG. In this configuration, a controller 22 as a control circuit is provided as shown in FIG. 1, and the control shown in FIG. 2 is performed by the controller 22 operating principally.

本構成では、例えば、電源投入などの所定開始条件の成立に伴い、図２に示す給湯制御が実行される。制御部に相当するコントローラ２２は、図２の制御が開始することに伴い、通水センサ３４での検出結果を継続的に確認し、入水管１２での通水状態を監視する（Ｓ１１）。本構成では、後述するように、通水センサ３４での通水検出量が所定値以下の通水停止時にバイパス弁３２が開状態で保たれ、バイパス路１４が開放状態で維持されることが前提となっている。そして、通水センサ３４での通水検出量が所定値を超えた通水状態であること（即ち、通水センサ３４が設けられた位置での水の流量が所定値を超えていること）が確認されると、Ｓ１１でＹｅｓに進み、バイパス弁３２を閉状態に切り替えてバイパス路１４を閉塞状態とする。なお、通水センサ３４での通水検出量が所定値を超えない通水停止状態では、所定の短時間毎に行われるＳ１１の処理において繰り返しＮｏに進み続けることになる。 In this configuration, for example, hot water control shown in FIG. 2 is executed in accordance with establishment of a predetermined start condition such as power-on. As the control of FIG. 2 starts, the controller 22 corresponding to the control unit continuously checks the detection result of the water flow sensor 34 and monitors the water flow state in the water inlet pipe 12 (S11). In this configuration, as will be described later, the bypass valve 32 is maintained in the open state and the bypass path 14 is maintained in the open state when the water flow detection amount in the water flow sensor 34 is less than a predetermined value. It is a premise. And it is the water flow state where the water flow detection amount in the water flow sensor 34 exceeds a predetermined value (that is, the flow rate of water at the position where the water flow sensor 34 is provided exceeds the predetermined value). Is confirmed, the process proceeds to Yes in S11, the bypass valve 32 is switched to the closed state, and the bypass passage 14 is closed. In addition, in the water flow stop state where the water flow detection amount by the water flow sensor 34 does not exceed the predetermined value, the process proceeds to No repeatedly in the process of S11 performed every predetermined short time.

Ｓ１２でバイパス弁３２を閉状態とし、バイパス路１４を閉塞状態とした後には、再び、通水センサ３４での通水検出結果に基づいて入水管１２が通水状態であるか否かを監視する（Ｓ１３）。そして、通水センサ３４での通水検出量が所定値を超えた通水状態であること（即ち、通水センサ３４が設けられた位置での水の流量が所定値を超えていること）が確認されると、Ｓ１３でＹｅｓに進み、給湯回路２及びバイパス路１４のいずれにも「つまり」が生じていない正常状態であるとして通常の燃焼制御を行う（Ｓ１４）。 After the bypass valve 32 is closed in S12 and the bypass passage 14 is closed, it is monitored again whether or not the water inlet pipe 12 is in a water flow state based on the water flow detection result in the water flow sensor 34. (S13). And it is the water flow state where the water flow detection amount in the water flow sensor 34 exceeds a predetermined value (that is, the flow rate of water at the position where the water flow sensor 34 is provided exceeds the predetermined value). Is confirmed, the process proceeds to Yes in S13, and normal combustion control is performed assuming that there is no “that is” in either the hot water supply circuit 2 or the bypass path 14 (S14).

このＳ１４での通常燃焼制御では、まず、コントローラ２２がファン４８を所定時間回転させて、燃焼室９０内に貯留している燃焼排気を排出させる（プリパージ）。その後、ガス管４０のガス元電磁弁４２、各給湯切替電磁弁４６を開弁させ、給湯ガス比例制御弁４４を所定開度で開弁させて、各ガスバーナ４（給湯バーナ）へガスを供給すると共に、イグナイタを作動させて各ガスバーナ４（給湯バーナ）に点火する。すると、各ガスバーナ４（給湯バーナ）は燃焼状態となり、各ガスバーナ４からの燃焼排気は、まず一次熱交換器７を通過して伝熱管７ａの通水と熱交換した後、二次熱交換器８を通過して伝熱管８ａの通水と熱交換して外部へ排出される。そして、コントローラ２２は、出湯管１０のサーミスタ２６によって出湯温度を監視し、出湯温度が図示しない給湯リモコン又は風呂リモコンによって指示された設定温度となるように、給湯切替電磁弁４６の開閉制御と、給湯ガス比例制御弁４４の開度調整とを行うと共に、ファン４８の回転数制御によって空気量を連続的に変化させる。 In the normal combustion control in S14, first, the controller 22 rotates the fan 48 for a predetermined time to discharge the combustion exhaust gas stored in the combustion chamber 90 (pre-purge). Thereafter, the gas source solenoid valve 42 and each hot water supply switching solenoid valve 46 of the gas pipe 40 are opened, the hot water supply gas proportional control valve 44 is opened at a predetermined opening, and gas is supplied to each gas burner 4 (hot water supply burner). At the same time, the igniter is operated to ignite each gas burner 4 (hot water supply burner). Then, each gas burner 4 (hot water supply burner) is in a combustion state, and the combustion exhaust from each gas burner 4 first passes through the primary heat exchanger 7 and exchanges heat with water passing through the heat transfer tubes 7a, and then the secondary heat exchanger. 8 is exchanged with the water passing through the heat transfer tube 8a and discharged to the outside. Then, the controller 22 monitors the hot water temperature by the thermistor 26 of the hot water pipe 10, and controls the opening and closing of the hot water switching electromagnetic valve 46 so that the hot water temperature becomes a set temperature indicated by a hot water remote controller or a bath remote controller (not shown). The opening amount of the hot water supply gas proportional control valve 44 is adjusted, and the air amount is continuously changed by controlling the rotational speed of the fan 48.

また、このＳ１４の通常燃焼制御中には、通水センサ３４での検出結果が通水停止状態となることを継続的に確認し続けており、Ｓ１５の終了確認処理を所定の短時間毎に定期的に行っている。そして、通水センサ３４での通水検出量が所定値を超えて通水センサ３４での検出結果が通水検出状態である間（即ち、通水センサ３４が設けられた位置での水の流量が所定値を超えている間）はＳ１５でＮｏに進み続け、Ｓ１４の通常燃焼制御を継続することになる。一方、湯出口１８側での閉栓などによって入水管１２での通水が停止し、通水センサ３４での通水検出量が所定値以下となるように通水センサ３４での検出結果が通水停止状態となった場合（即ち、通水センサ３４が設けられた位置での水の流量が所定値以下となった場合）には、Ｓ１５にてＹｅｓに進み、コントローラ２２は、ガスバーナ４を停止する制御を行う（Ｓ１６）。具体的には、ガス元電磁弁４２及び給湯切替電磁弁４６を閉じてガスバーナ４を消火させ、所定時間ファン４８を回転させる（ポストパージ）。更に、このＳ１６での停止制御の後には、バイパス弁３２を所定の開放状態（例えば、全開状態）に切り替えておく（Ｓ１７）。このように、通常燃焼制御の停止後にバイパス路１４が開放状態とされるため、上述したように、通水センサ３４での通水検出量が所定値以下となるような通水停止時にはバイパス路１４が開放状態で維持されることになる。そして、次の通水開始時には、バイパス路１４が開放していることを前提として通水が開始する。なお、Ｓ１７の処理後には、再びスタートに戻って図２の処理が実行され、Ｓ１１にて通水を監視することになる。 During the normal combustion control in S14, it is continuously confirmed that the detection result of the water flow sensor 34 is in the water flow stop state, and the end confirmation process in S15 is performed every predetermined short time. I go regularly. Then, while the amount of water detected by the water flow sensor 34 exceeds a predetermined value and the detection result by the water flow sensor 34 is in the water flow detection state (that is, water at the position where the water flow sensor 34 is provided). While the flow rate exceeds the predetermined value), the process continues to No in S15, and the normal combustion control in S14 is continued. On the other hand, the water flow through the water intake pipe 12 is stopped by plugging at the hot water outlet 18 side, and the detection result of the water flow sensor 34 passes so that the amount of water flow detected by the water flow sensor 34 is below a predetermined value. When the water stop state occurs (that is, when the flow rate of water at the position where the water flow sensor 34 is provided becomes equal to or less than a predetermined value), the process proceeds to Yes in S15, and the controller 22 turns off the gas burner 4. Control to stop is performed (S16). Specifically, the gas source solenoid valve 42 and the hot water supply switching solenoid valve 46 are closed to extinguish the gas burner 4, and the fan 48 is rotated for a predetermined time (post purge). Further, after the stop control in S16, the bypass valve 32 is switched to a predetermined open state (for example, fully open state) (S17). As described above, since the bypass passage 14 is opened after the normal combustion control is stopped, as described above, the bypass passage can be used when the water flow detection amount in the water flow sensor 34 is less than a predetermined value. 14 will be maintained in an open state. And at the time of the next water flow start, water flow starts on the assumption that the bypass 14 is open. In addition, after the process of S17, it returns to a start again and the process of FIG. 2 is performed, and water flow is monitored in S11.

このように、制御部に相当するコントローラ２２は、通水センサ３４が入水管１２内の通水を検知していない非検知状態から入水管１２内の通水を検知した検知状態に変化したこと（即ち、Ｓ１１でＹｅｓに進む場合）を条件として、バイパス弁３２を閉状態に制御し、これによりバイパス路１４を閉塞状態としている。そして、このコントローラ２２は、入水管１２での通水開始に伴う上記閉塞状態（Ｓ１２）のときに通水センサ３４が検知状態となる場合（即ち、Ｓ１３でＹｅｓに進む場合）に、ガスバーナ４を燃焼状態とする所定の通常燃焼制御（Ｓ１４）を行い、更に、その通常燃焼制御がなされた後のガスバーナ４の燃焼停止（Ｓ１６）に伴って、バイパス路１４を再び開放状態（Ｓ１７）に戻すように制御を行っている。 As described above, the controller 22 corresponding to the control unit has changed from a non-detection state in which the water flow sensor 34 has not detected water flow in the water inlet pipe 12 to a detection state in which water flow in the water inlet pipe 12 is detected. On the condition that the process proceeds to Yes in S11, the bypass valve 32 is controlled to be closed, and thereby the bypass path 14 is closed. And this controller 22 is the gas burner 4 when the water flow sensor 34 will be in a detection state in the said obstruction | occlusion state (S12) accompanying the water flow start in the water intake pipe 12 (namely, when progressing to Yes by S13). The predetermined normal combustion control (S14) is performed so that the combustion state of the gas burner 4 is stopped, and the bypass passage 14 is again opened (S17) when the combustion of the gas burner 4 after the normal combustion control is stopped (S16). Control is performed to return.

一方で、Ｓ１２でバイパス路１４を閉塞したときに、通水センサ３４によって通水が確認されない場合（即ち、通水センサ３４での通水検出量が所定値以下のままであり、通水センサ３４が設けられた位置での水の流量が所定値以下のままである場合）には、Ｓ１３にてＮｏに進み、この場合、バイパス弁３２を開状態に制御することで、バイパス路１４を開放状態とする（Ｓ１８）。そして、Ｓ１８でバイパス路１４を開放状態とした後には、再び、通水センサ３４での通水検出結果に基づいて入水管１２が通水状態であるか否かを確認する（Ｓ１９）。そして、通水センサ３４での通水検出量が所定値を超えた通水状態であること（即ち、通水センサ３４が設けられた位置での水の流量が所定値を超えていること）が確認されると、Ｓ１９でＹｅｓに進み、給湯回路２のつまり状態（バイパス路１４には「つまり」が生じていないが、給湯回路２に「つまり」が生じている状態）であるとして凍結解除のための燃焼制御を行う（Ｓ２０）。 On the other hand, when the bypass passage 14 is closed in S12, if water passage is not confirmed by the water passage sensor 34 (that is, the amount of water passage detected by the water passage sensor 34 remains below a predetermined value, the water passage sensor In the case where the flow rate of water at the position where 34 is provided remains below a predetermined value), the process proceeds to No in S13, and in this case, the bypass valve 32 is controlled to be opened, thereby bypassing the bypass 14. An open state is set (S18). Then, after the bypass path 14 is opened in S18, it is confirmed again whether or not the water inlet pipe 12 is in a water flow state based on the water flow detection result in the water flow sensor 34 (S19). And it is the water flow state where the water flow detection amount in the water flow sensor 34 exceeds a predetermined value (that is, the flow rate of water at the position where the water flow sensor 34 is provided exceeds the predetermined value). Is confirmed, the process proceeds to Yes in S19, where the hot water supply circuit 2 is in a clogged state (“that is, there is no“ that is ”in the bypass passage 14, but“ that ”is generated in the hot water circuit 2)” is frozen. Combustion control for release is performed (S20).

このＳ２０の凍結解除燃焼制御でも、コントローラ２２がファン４８を所定時間回転させて、燃焼室９０内に貯留している燃焼排気の排出（プリパージ）を行い、その後、ガス管４０のガス元電磁弁４２、各給湯切替電磁弁４６を開弁させ、給湯ガス比例制御弁４４を所定開度で開弁させて、各ガスバーナ４（給湯バーナ）へガスを供給すると共に、イグナイタを作動させて各ガスバーナ４（給湯バーナ）に点火する。これにより、各ガスバーナ４（給湯バーナ）が燃焼状態となり、一次熱交換器７及び二次熱交換器８がその燃焼熱によって加熱される。 Also in this freezing release combustion control of S20, the controller 22 rotates the fan 48 for a predetermined time to discharge (pre-purge) the combustion exhaust gas stored in the combustion chamber 90, and then the gas source solenoid valve of the gas pipe 40 42, each hot water supply switching electromagnetic valve 46 is opened, the hot water supply gas proportional control valve 44 is opened at a predetermined opening, gas is supplied to each gas burner 4 (hot water supply burner), and each igniter is operated to operate each gas burner. Ignite 4 (hot water burner). Thereby, each gas burner 4 (hot-water supply burner) will be in a combustion state, and the primary heat exchanger 7 and the secondary heat exchanger 8 will be heated with the combustion heat.

このように、本構成では、制御部に相当するコントローラ２２は、入水管１２での通水開始に伴う上記閉塞状態（Ｓ１２）のときに通水センサ３４が非検知状態となる場合には、バイパス弁３２の開度を上記閉塞状態のときよりも増大させる開放制御（Ｓ１８）を行い、その後、ガスバーナ４を燃焼させると共に所定の終了条件が成立するまでガスバーナ４の燃焼状態を継続する凍結解除燃焼制御を行うようになっている。このような制御により、「つまり」が生じている可能性が高い熱交換器６付近を加熱し、凍結の解除を試みることができる。 As described above, in this configuration, the controller 22 corresponding to the control unit, when the water flow sensor 34 is in a non-detection state in the closed state (S12) accompanying the start of water flow in the water inlet pipe 12, Open control (S18) is performed to increase the opening degree of the bypass valve 32 as compared with that in the closed state, and then the gas burner 4 is burned and the combustion state of the gas burner 4 is continued until a predetermined end condition is satisfied. Combustion control is performed. By such control, it is possible to heat the vicinity of the heat exchanger 6 where there is a high possibility that “that is” occurs, and to attempt to release the freeze.

そして、Ｓ２０で凍結解除燃焼制御が開始された後には、出湯管１０の温度が一定温度以上上昇したか否かを継続的に監視している（Ｓ２１）。例えば、Ｓ２０で凍結解除燃焼制御が実行され始めた時点におけるサーミスタ２６での検出温度をＴ１とした場合、Ｓ２１では、サーミスタ２６の温度がこのＴ１から第１温度θ以上上昇しているか否かを判定する。そして、サーミスタ２６の温度がＴ１＋θに達している場合には、Ｓ２１にてＹｅｓに進み、Ｓ２２にてガスバーナ４の停止制御を行う。一方、サーミスタ２６の温度がＴ１＋θに達していない場合には、Ｓ２１にてＮｏに進み、Ｓ２０の制御を継続することになる。 Then, after the freeze release combustion control is started in S20, it is continuously monitored whether or not the temperature of the tapping pipe 10 has risen above a certain temperature (S21). For example, when the detected temperature of the thermistor 26 at the time when the freeze release combustion control starts to be executed in S20 is T1, in S21, it is determined whether or not the temperature of the thermistor 26 has increased from this T1 by the first temperature θ or more. judge. If the temperature of the thermistor 26 has reached T1 + θ, the process proceeds to Yes in S21, and stop control of the gas burner 4 is performed in S22. On the other hand, if the temperature of the thermistor 26 has not reached T1 + θ, the process proceeds to No in S21 and the control in S20 is continued.

このように制御部に相当するコントローラ２２は、Ｓ２０での凍結解除燃焼制御の実行中に熱交換器６の下流側における通水経路内の温度が所定温度に達した場合、Ｓ２２に進んで凍結解除燃焼制御を停止させる構成となっている。Ｓ２０での凍結解除燃焼制御の実行中に熱交換器６の下流側において通水経路内の温度が所定温度に達した場合、凍結が解除されて所期の目的が達成された可能性が高いため、このような場合に、それ以上の燃焼を停止させることで、水が加熱されすぎることを防ぐことができる。 As described above, when the temperature in the water passage on the downstream side of the heat exchanger 6 reaches the predetermined temperature during the execution of the freeze release combustion control in S20, the controller 22 corresponding to the control unit proceeds to S22 and freezes. The release combustion control is stopped. When the temperature in the water passage reaches a predetermined temperature on the downstream side of the heat exchanger 6 during the execution of the freeze release combustion control in S20, it is highly possible that the intended purpose has been achieved by releasing the freeze. Therefore, in such a case, it is possible to prevent water from being heated excessively by stopping further combustion.

また、本構成では、上述したように、Ｓ１９での開放制御によってバイパス路１４の開放状態となったときに通水センサ３４が通水検知状態となることを条件としてＳ２０での凍結解除燃焼制御を行っているが、Ｓ１９での開放制御によってバイパス路１４が開放状態となったときに通水センサ３４が通水検知状態とならない場合には、Ｓ２３にて非通水対応処理を行っている。このように、Ｓ１８でバイパス路１４を開放しても通水センサ３４で通水が確認されない場合、急遽のつまりやその他の異常（センサ異常やその他の機器異常）などが考えられる。従って、このような場合に、Ｓ２３にて適切な対応処理を行えば、機器の現状に合ったより適切な対応が可能となる。なお、Ｓ２３での非通水対応処理は、例えば、図示しない表示部によって所定のエラーコードやエラーメッセージなどを表示するような表示処理であってもよく、ブザーや音声メッセージなどでエラーを伝えるような音声処理であってもよい。また、このようなエラー報知処理に代えて、又はエラー報知処理と共に、ヒータによって機器全体又は機器の所定部分（例えば、バイパス路１４付近）を温めるように凍結解除を試みてもよい。なお、Ｓ２３の非通水対応処理が行われる場合でも、Ｓ２２で凍結解除燃焼制御が停止する場合でも、バイパス路１４は開放状態で終了するため、その後の通水停止時にはバイパス路１４が開放状態で維持されることになる。そして、次の通水開始時には、上述したようにバイパス路１４が開放していることを前提として通水が開始する。なお、Ｓ２２又はＳ２３の処理後には、再びスタートに戻って図２の処理が実行され、Ｓ１１にて通水を監視することになる。 Further, in this configuration, as described above, the freeze release combustion control in S20 is performed on condition that the water flow sensor 34 enters the water flow detection state when the bypass passage 14 is opened by the opening control in S19. However, if the water passage sensor 34 does not enter the water passage detection state when the bypass passage 14 is opened by the opening control in S19, the non-water passage processing is performed in S23. . Thus, if water passage is not confirmed by the water passage sensor 34 even if the bypass passage 14 is opened in S18, a sudden or other abnormality (sensor abnormality or other equipment abnormality) may be considered. Therefore, in such a case, if an appropriate response process is performed in S23, a more appropriate response corresponding to the current state of the device can be achieved. The non-water-passing process in S23 may be, for example, a display process in which a predetermined error code or error message is displayed on a display unit (not shown), and an error is reported by a buzzer or a voice message. Voice processing may be used. Further, instead of such an error notification process or together with the error notification process, the freeze release may be attempted so that the entire device or a predetermined part of the device (for example, the vicinity of the bypass 14) is heated by a heater. Even when the non-water-passing process of S23 is performed or when the freeze release combustion control is stopped in S22, the bypass path 14 ends in an open state. Will be maintained. And at the time of the next water flow start, water flow starts on the assumption that the bypass 14 is open as mentioned above. In addition, after the process of S22 or S23, it returns to a start again and the process of FIG. 2 is performed, and water flow is monitored in S11.

また、Ｓ２０の処理では、Ｓ２０での凍結解除燃焼制御の実行が開始されてから所定時間ｔが経過するまでの間に熱交換器６の下流側の通水経路内の温度が第１温度θ以上上昇しないことを条件として所定のエラー報知を行うようにしてもよい。例えば、Ｓ２０で凍結解除燃焼制御の実行が開始された時点でのサーミスタ２６での検出温度をＴ１とした場合、Ｓ２０で凍結解除燃焼制御の実行が開始されてから所定時間ｔを経過しても、サーミスタ２６の検出温度がＴ１＋θに達しない場合、Ｓ２０の処理を中止してＳ２２に進み、所定のエラー報知を行うようにしてもよい。このように、Ｓ２０で凍結解除燃焼制御を行っても熱交換器６の下流側における通水経路内の温度が第１温度θ以上上昇しない場合、熱交換器６の加熱によって「つまり」が解消されておらず、熱交換器６の「つまり」の原因が凍結ではなく他の要因（スケールや異物など）と考えられる。よって、このような場合にその旨を報知すれば、報知を受けた主体がより迅速に適切な対応をとりやすくなる。なお、この場合のエラー報知（即ち、凍結解除燃焼制御を行ってもつまりが解消できないことを示すエラー報知）は、例えば、コントローラ２２や給湯リモコン、風呂リモコンなどに設けられた表示部にて所定のエラーメッセージやエラーコードを表示するような所定表示による報知であってもよく、例えば、コントローラ２２や給湯リモコン、風呂リモコンに設けられたスピーカなどからブザー音やエラーメッセージなどを発音する報知などであってもよい。これらの場合、コントローラ２２及び上記報知媒体（上記表示部や上記スピーカなど）が報知部の一例に相当する。また、このように、Ｓ２０で凍結解除燃焼制御の実行が開始されてから所定時間ｔが経過するまでの間に熱交換器６の下流側の通水経路内の温度が第１温度θ以上上昇しない場合、Ｓ２２に進んで凍結解除燃焼制御を停止させる構成とすれば、不必要の可能性が高い燃焼動作をより速やかに停止することができる。 In the process of S20, the temperature in the water flow path on the downstream side of the heat exchanger 6 is the first temperature θ between the start of execution of the freeze release combustion control in S20 and the elapse of the predetermined time t. You may make it perform a predetermined | prescribed error alert | report on condition that it does not rise above. For example, if the temperature detected by the thermistor 26 at the time when execution of the freeze release combustion control is started in S20 is T1, even if a predetermined time t has elapsed since the execution of the freeze release combustion control was started in S20. If the detected temperature of the thermistor 26 does not reach T1 + θ, the process of S20 may be stopped and the process may proceed to S22 to perform a predetermined error notification. As described above, if the temperature in the water flow path on the downstream side of the heat exchanger 6 does not increase by the first temperature θ or more even after performing the freeze release combustion control in S20, the “that is” is eliminated by heating the heat exchanger 6. In other words, the cause of the heat exchanger 6 “clogging” is not freezing but is considered to be other factors (scale, foreign matter, etc.). Therefore, in such a case, if the fact is notified, it becomes easier for the subject who has received the notification to take an appropriate action more quickly. Note that the error notification in this case (that is, the error notification indicating that clogging cannot be resolved even if the freeze release combustion control is performed) is performed on a display unit provided in the controller 22, a hot water remote controller, a bath remote controller, or the like. For example, a notification such as a buzzer sound or an error message may be generated from a speaker or the like provided in the controller 22, a hot water remote controller, or a bath remote controller. There may be. In these cases, the controller 22 and the notification medium (the display unit, the speaker, etc.) correspond to an example of the notification unit. As described above, the temperature in the water flow path on the downstream side of the heat exchanger 6 rises by the first temperature θ or more after the predetermined time t elapses after the execution of the freeze release combustion control is started in S20. If not, if the configuration proceeds to S22 to stop the freeze release combustion control, the combustion operation that is highly likely to be unnecessary can be stopped more quickly.

１…風呂・給湯システム（給湯装置）
４…ガスバーナ
７…一次熱交換器（熱交換器）
７ａ…伝熱管
８…二次熱交換器（熱交換器）
８ａ…伝熱管
１０…出湯管
１２…入水管
１４…バイパス路
１６…水入口
２２…コントローラ（制御部）
３２…バイパス弁
３４…通水センサ 1 ... Bath / hot water system (hot water supply system)
4 ... Gas burner 7 ... Primary heat exchanger (heat exchanger)
7a ... Heat transfer tube 8 ... Secondary heat exchanger (heat exchanger)
8a ... Heat transfer pipe 10 ... Hot water pipe 12 ... Inlet pipe 14 ... Bypass path 16 ... Water inlet 22 ... Controller (control part)
32 ... Bypass valve 34 ... Water flow sensor

Claims

With a gas burner,
A water inlet pipe configured as a path through which water flows from the water inlet;
A tapping pipe configured as a path for sending hot water to the hot water outlet;
A heat exchanger comprising a heat transfer pipe configured as a water passage between the water inlet pipe and the hot water outlet pipe, and transferring heat by transferring heat of combustion generated in the gas burner to water passing through the heat transfer pipe When,
A bypass path connected to the water inlet pipe and the hot water outlet pipe and configured as a water flow path different from the heat exchanger;
A bypass valve capable of shifting the bypass path to at least a predetermined closed state and a state in which the opening degree is increased more than the closed state;
A water flow sensor for detecting water flow in the water intake pipe;
A control unit for controlling the bypass valve and the gas burner;
With
The controller is
On the condition that the water flow sensor has changed from a non-detected state in which water flow in the water intake pipe is not detected to a detection state in which water flow in the water intake pipe is detected, the bypass path is in the blocked state. And the configuration
When the water flow sensor is in the detection state when the water flow is started in the water intake pipe, predetermined normal combustion control is performed so that the gas burner is in a combustion state, and combustion of the gas burner is performed. After stopping and finishing the normal combustion control, the bypass path is left open,
When the water flow sensor is in the non-detection state when the water flow is started in the water intake pipe, opening control for opening the bypass path is performed, the gas burner is burned, and a predetermined value is set. A hot water supply apparatus that performs freeze-release combustion control for continuing the combustion state of the gas burner until an end condition is satisfied.

When the water flow sensor is in the non-detection state when the control unit is in the closed state due to the start of water flow through the water intake pipe, the water flow sensor is in the open state of the bypass path by the open control. The hot water supply apparatus according to claim 1, wherein the freeze release combustion control is performed on condition that the detection state is reached.

When the temperature in the water flow path on the downstream side of the heat exchanger does not rise above the first temperature after the predetermined time has elapsed after the freeze release combustion control is executed, the control unit The hot water supply apparatus according to claim 1 or 2, wherein the release combustion control is stopped.

A predetermined error occurs on the condition that the temperature in the water flow path on the downstream side of the heat exchanger does not rise above the first temperature between the execution of the freeze release combustion control and the elapse of the predetermined time. The hot water supply device according to claim 3, further comprising a notification unit that performs notification.

The said control part stops the said freeze release combustion control, when the temperature in the water flow path of the downstream of the said heat exchanger reaches predetermined temperature during execution of the said freeze release combustion control. The hot water supply device according to any one of claims 1 to 4.