JP2015021681A

JP2015021681A - Instantaneous hot-water supply system

Info

Publication number: JP2015021681A
Application number: JP2013151346A
Authority: JP
Inventors: 茂輝島田; Shigeteru Shimada; 愛弓削; Ai Yuge
Original assignee: Rinnai Corp
Current assignee: Rinnai Corp
Priority date: 2013-07-22
Filing date: 2013-07-22
Publication date: 2015-02-02
Anticipated expiration: 2033-07-22
Also published as: JP5980176B2

Abstract

PROBLEM TO BE SOLVED: To provide an instantaneous hot-water supply system capable of detecting that hot-water is being supplied without a special sensor.SOLUTION: An instantaneous hot-water supply system 1 comprises: a type P water heater 10 which heats water flowing in a first supply pipe 2; a type N water heater 30 which heats the water flowing in a second supply pipe 3; a check valve 6; and a connection controller 60. The connection controller 60 executes: hot-water supplying operation to activate a first burner 12 or a second burner 32 with a circulation pump 16 stopped when a detected flow rate of a second flow rate sensor 34 is not less than a hot-water supply detection flow rate; and circulating temperature keeping operation to activate the first burner 12 with the circulation pump 16 operated when the detected flow rate of the second flow rate sensor 34 is less than the hot-water supply detection flow rate.

Description

本発明は、出湯栓が開けられたときに、直ちに湯が供給される機能を備えた即時給湯システムに関する。 The present invention relates to an immediate hot water supply system having a function of supplying hot water immediately when a tap is opened.

従来より、一端が上水道に接続されると共に他端が出湯栓に接続された往き管の途中に、往き管を流通する湯水を加熱する複数台の給湯器を接続し、これらの給湯器をバイパスして往き管を連通した戻り管と、往き管及び戻り管から成る循環回路内の湯水を循環させる循環ポンプとを備えた即時給湯システムが知られている（例えば、特許文献１参照）。 Conventionally, a plurality of water heaters for heating the hot water flowing through the forward pipe are connected in the middle of the outgoing pipe whose one end is connected to the water supply and the other end is connected to the hot water tap, and these hot water heaters are bypassed. An immediate hot water supply system is known that includes a return pipe that communicates an outgoing pipe and a circulation pump that circulates hot water in a circulation circuit including the outgoing pipe and the return pipe (see, for example, Patent Document 1).

特許文献１に記載された即時給湯システムにおいては、出湯栓が閉じられて給湯が停止しているときに、循環ポンプを作動させて循環回路内の湯水を循環させながら、給湯器を流通する湯水を加熱する循環保温運転を行っている。このように、循環保温運転を行って循環回路内の湯水を設定温度付近に維持することにより、使用者が出湯栓を開けたときに、出湯栓から直ちに湯が供給されるようにしている。 In the instant hot water supply system described in Patent Document 1, when the hot water tap is closed and the hot water supply is stopped, the hot water flowing through the water heater is operated while circulating the hot water in the circulation circuit by operating the circulation pump. Circulating heat insulation operation is performed to heat the As described above, the hot water in the circulation circuit is maintained in the vicinity of the set temperature by performing the circulating heat insulation operation, so that the hot water is immediately supplied from the hot water tap when the user opens the hot water tap.

また、前記即時給湯システムにおいては、出湯栓から湯が供給されているとき（給湯状態であるとき）に、循環ポンプを停止するようにしている。そのため、給湯状態になったことを検知するために、往き管を流れる湯水の流量を検出する第１流量センサと、戻り管を流れる湯水の流量を検出する第２流量センサと、給水管と戻り管との合流箇所に設けた第３温度センサとを備えている。 In the instant hot water supply system, the circulation pump is stopped when hot water is supplied from the tap (when hot water is supplied). Therefore, in order to detect that the hot water supply state has been reached, a first flow rate sensor that detects the flow rate of hot water flowing through the forward pipe, a second flow rate sensor that detects the flow rate of hot water flowing through the return pipe, the water supply pipe and the return pipe And a third temperature sensor provided at a junction with the pipe.

そして、（ａ）第３温度センサの検出温度が急速に低下したとき、及び（ｂ）第１流量センサの検出流量と第２流量センサの検出流量との差が所定流量以上になったときに、循環ポンプを停止している。 And (a) when the detected temperature of the third temperature sensor rapidly decreases, and (b) when the difference between the detected flow rate of the first flow rate sensor and the detected flow rate of the second flow rate sensor becomes equal to or higher than a predetermined flow rate. The circulation pump is stopped.

特開２００４−２８６３９７号公報Japanese Patent Application Laid-Open No. 2004-286397

上述したように、従来の即時給湯システムにおいては、給湯状態であるときに循環ポンプの作動を停止するのが一般的である。そして、給湯状態であることを検知するために、前記即時給湯システムにように、戻り管を流れる湯水の流量を検出する第２流量センサと、戻り管と給水管の合流箇所に設けた第３温度センサとを、専用に備えた場合には、構成部品の増加により、システムの構成が複雑になると共にシステムのコストが増大するという不都合がある。 As described above, in the conventional immediate hot water supply system, the operation of the circulation pump is generally stopped when the hot water supply state is set. And in order to detect that it is a hot-water supply state, like the said immediate hot-water supply system, the 2nd flow sensor which detects the flow volume of the hot water which flows through a return pipe, and the 3rd provided in the junction of a return pipe and a water supply pipe When the temperature sensor is provided exclusively, there is an inconvenience that the configuration of the system becomes complicated and the cost of the system increases due to an increase in the number of components.

本発明はかかる背景に鑑みてなされたものであり、専用のセンサを備えることなく、給湯状態であることを検知可能な即時給湯システムを提供することを目的とする。 The present invention has been made in view of such a background, and an object thereof is to provide an immediate hot water supply system capable of detecting the hot water supply state without providing a dedicated sensor.

本発明は上記目的を達成するためになされたものであり、本発明の即時給湯システムは、
一端が上水道に接続され、他端が出湯栓に接続された第１往き管と、
前記第１往き管の一端と他端間を連通する戻り管と、
前記第１往き管の途中に接続されて、前記第１往き管を流通する湯水を加熱する第１加熱部と、前記第１往き管と前記戻り管から成る循環回路内の湯水を循環させる循環ポンプとを備えた第１給湯器と、
前記第１往き管の前記第１給湯器の上流側と下流側を連通した第２往き管と、
前記第２往き管の途中に接続されて、前記第２往き管を流通する湯水を加熱する第２加熱部と、前記第２往き管から流入する湯水の流量を検出する第２流量センサとを備えた第２給湯器と、
前記第２往き管から前記第２給湯器への通水を可能にし、前記第２給湯器から前記第２往き管への通水を不能にする逆止弁と、
前記第２流量センサの検出流量が所定の給湯検知流量未満であるときは、前記循環ポンプを作動させた状態で、前記第１加熱部を作動させる循環保温運転を実行し、前記第２流量センサの検出流量が前記給湯検知流量以上であるときには、前記循環ポンプを停止した状態で、前記第１加熱部と前記第２加熱部とのうちの少なくともいずれか一方を作動させる給湯運転を実行する制御部と
を備えたことを特徴とする。 The present invention has been made to achieve the above object, and the instant hot water supply system of the present invention includes:
A first forward pipe having one end connected to the water supply and the other end connected to a tap;
A return pipe communicating between one end and the other end of the first forward pipe;
Circulation connected to the middle of the first forward pipe for circulating hot water in a circulation circuit comprising a first heating section for heating the hot water flowing through the first forward pipe, and the first forward pipe and the return pipe. A first water heater comprising a pump;
A second forward pipe communicating with the upstream side and the downstream side of the first hot water heater of the first forward pipe;
A second heating unit connected in the middle of the second forward pipe for heating the hot water flowing through the second forward pipe; and a second flow rate sensor for detecting a flow rate of hot water flowing from the second forward pipe. A second water heater provided,
A check valve that allows water to flow from the second forward pipe to the second hot water heater and disables water from the second hot water heater to the second forward pipe;
When the detected flow rate of the second flow rate sensor is less than a predetermined hot water supply detection flow rate, a circulation heat retention operation for operating the first heating unit is performed in a state where the circulation pump is operated, and the second flow rate sensor When the detected flow rate is equal to or higher than the detected hot water supply flow rate, a control for executing a hot water supply operation for operating at least one of the first heating unit and the second heating unit with the circulation pump stopped. And a section.

かかる本発明によれば、前記循環保温運転が実行されているときに、前記第２給湯器については、循環ポンプによる前記第２加熱部への湯水の吸い込みは行われず、また、前記逆止弁により前記第２往き管の下流側から前記第２給湯器への湯水の流入が禁止される。そのため、前記出湯栓が閉栓されていれば、第２流量センサの検出流量は前記給湯検知流量未満になる。 According to the present invention, when the circulation heat insulation operation is being performed, the second water heater is not sucked into the second heating unit by the circulation pump, and the check valve Thus, the inflow of hot water into the second water heater from the downstream side of the second forward pipe is prohibited. Therefore, if the hot-water tap is closed, the detection flow rate of the second flow rate sensor is less than the hot water supply detection flow rate.

そして、前記出湯栓が開栓されると、前記第２往き管から前記第２給湯器を経由して前記出湯栓に湯水が流れるようになるため、前記第２流水センサの検出流量が前記給湯検知流量以上になる。そのため、前記循環保温運転の実行中に、前記第２流量センサの検出流量が前記給湯検知流量以上になったときに、前記出湯栓が開栓されて給湯状態になったと判断することができる。 When the hot water tap is opened, hot water flows from the second forward pipe to the hot water tap through the second hot water supply device, so that the flow rate detected by the second flowing water sensor is the hot water supply temperature. Over the detected flow rate. Therefore, when the detected flow rate of the second flow sensor becomes equal to or higher than the hot water supply detection flow rate during execution of the circulating heat insulation operation, it can be determined that the hot water tap has been opened and the hot water supply state has been entered.

そして、前記第２流量センサは、前記第２給湯器において湯水が流通していない状態での第２加熱部による加熱を禁止するために、一般的に備えられるものである。そのため、専用のセンサを設けることなく、給湯状態であることを検知して、前記制御部により前記給湯運転を実行することができる。 The second flow rate sensor is generally provided to prohibit heating by the second heating unit in a state where hot water is not circulating in the second water heater. Therefore, it is possible to detect the hot water supply state without providing a dedicated sensor and execute the hot water supply operation by the control unit.

また、前記第２給湯器は、前記第２往き管から前記第２加熱部への通水が可能な通水可能状態と、前記第２往き管から前記第２加熱部への通水が不能な通水不能状態とを切換える第２通水切換弁を備え、
前記第２給湯器と前記第２往き管と前記逆止弁とを有する第２給湯ユニットを複数備えて、
前記制御部は、前記複数の第２給湯器のうちの少なくとも１台を前記第２通水切換弁により通水可能状態として、前記循環保温運転を実行し、前記循環保温運転の実行中に、該通水可能状態とした第２給湯器の前記第２流量センサの検出流量が前記給湯検知流量以上になったときに、前記循環保温運転を終了して前記給湯運転を実行し、
前記給湯運転の実行中に、通水可能状態である前記第２給湯器の前記第２流量センサの検出流量の総量に応じて、通水可能状態とする前記第２給湯器の台数を変更することを特徴とする。 Further, the second water heater is capable of passing water from the second forward pipe to the second heating part, and cannot pass water from the second forward pipe to the second heating part. Provided with a second water flow switching valve for switching between a state where water flow is impossible,
A plurality of second hot water supply units having the second water heater, the second forward pipe, and the check valve;
The controller is configured to allow at least one of the plurality of second water heaters to pass through the second water flow switching valve, to perform the circulation heat insulation operation, and during the execution of the circulation heat insulation operation, When the detected flow rate of the second flow rate sensor of the second water heater that is in a water flowable state becomes equal to or higher than the detected hot water flow rate, the circulating heat insulation operation is terminated and the hot water supply operation is executed.
During execution of the hot water supply operation, the number of second water heaters that are allowed to pass water is changed according to the total amount of flow detected by the second flow rate sensor of the second water heater that is allowed to pass water. It is characterized by that.

この構成によれば、前記給湯運転の実行中に、通水可能状態である前記第２給湯器の前記第２流量センサの検出流量の総量に応じて、通水可能状態とする前記第２給湯器の台数を変更することによって、湯の使用流量に応じて効率の良い給湯運転を行うことができる。 According to this configuration, during execution of the hot water supply operation, the second hot water supply that is allowed to pass water according to the total amount of flow detected by the second flow rate sensor of the second water heater that is allowed to pass water. By changing the number of units, an efficient hot water supply operation can be performed according to the hot water flow rate.

また、前記第１給湯器は、前記第１往き管から流入する湯水の流量を検出する第１流量センサと、前記第１往き管から前記第１加熱部への通水が可能な通水可能状態と、前記第１往き管から前記第１加熱部への通水が不能な通水不能状態とを切換える第１通水切換弁とを備え、
前記第１給湯器と前記第１往き管とを有する第１給湯ユニットを複数備えて、
前記制御部は、前記給湯運転の実行中に、通水可能状態である前記第１給湯器の前記第１流量センサの検出流量の総量に応じて、通水可能状態とする前記第１給湯器の台数を変更することを特徴とする。 The first water heater is capable of passing water from a first flow rate sensor that detects a flow rate of hot water flowing from the first forward pipe and from the first forward pipe to the first heating unit. A first water flow switching valve that switches between a state and a water impermeable state in which water cannot be passed from the first forward pipe to the first heating unit,
A plurality of first hot water supply units having the first water heater and the first forward pipe;
The control unit is configured to allow water to flow in accordance with a total amount of flow detected by the first flow rate sensor of the first water heater that is in a water flowable state during execution of the hot water supply operation. The number of units is changed.

この構成によれば、前記給湯運転の実行中に、通水可能状態である前記第１給湯器の前記第１流量センサの検出流量の総量に応じて、通水可能状態とする前記第１給湯器の台数を変更することによって、湯の使用流量に応じて効率の良い給湯運転を行うことができる。 According to this configuration, during the execution of the hot water supply operation, the first hot water supply that is allowed to pass water according to the total amount of flow detected by the first flow rate sensor of the first water heater that is in a water flow enabled state. By changing the number of units, an efficient hot water supply operation can be performed according to the hot water flow rate.

即時給湯システムの構成図（循環保温運転状態）。The block diagram of an immediate hot water supply system (circulation heat insulation operation state). 即時給湯システムの構成図（給湯運転状態）。The block diagram of a hot water supply system (hot water supply operation state). 循環保温運転のフローチャート。Flowchart of circulating heat insulation operation. 給湯運転のフローチャート。The flowchart of a hot water supply driving | operation. 各給湯器の優先度の説明図。Explanatory drawing of the priority of each water heater.

本発明の実施形態について、図１〜図５を参照して説明する。図１を参照して、本実施形態の即時給湯システム１は連結給湯型であり、５台の給湯器１０，２０，３０，４０，５０と、各給湯器１０，２０，３０，４０，５０と通信可能に接続された連結コントローラ６０と、連結コントローラ６０と通信可能に接続されたリモコン７０とを備えている。 An embodiment of the present invention will be described with reference to FIGS. Referring to FIG. 1, an immediate hot water supply system 1 of the present embodiment is a connected hot water supply type, and includes five water heaters 10, 20, 30, 40, 50 and each water heater 10, 20, 30, 40, 50. And a remote controller 70 communicatively connected to the connection controller 60.

また、即時給湯システム１は、一端が上水道に接続されると共に他端が出湯栓９に接続された第１往き管２と、第１往き管２の出湯栓９との接続箇所及び第１往き管２と上水道との接続箇所間を連通した戻り管４と、戻り管４に設けられて戻り管４から第１往き管２への通水を可能にすると共に第１往き管２から戻り管４への通水を不能とする逆止弁５とを備えている。 Further, the immediate hot water supply system 1 includes a first outgoing pipe 2 whose one end is connected to the water supply and the other end is connected to the hot water tap 9, and a connection place between the hot water tap 9 of the first outgoing pipe 2 and the first outgoing line. A return pipe 4 communicating between the connection points of the pipe 2 and the water supply, and a return pipe provided on the return pipe 4 to allow water to pass from the return pipe 4 to the first forward pipe 2 and from the first forward pipe 2 to the return pipe 4 is provided with a check valve 5 that disables water flow to 4.

給湯器１０は、第１往き管２の途中に接続された第１熱交換器１１と、第１熱交換器１１を加熱する第１バーナ１２と、第１往き管２の開度を調節する第１水量サーボ１３（本発明の第１通水切換弁の機能を含む）と、第１往き管２から供給される湯水の流量を検出する第１流量センサ１４と、第１往き管２に流出する湯水の温度を検出する第１温度センサ１５と、第１往き管２から湯水を吸入して第１往き管２と戻り管４から成る循環回路内の湯水を循環させる循環ポンプ１６と、給湯器１０の作動を制御する第１給湯コントローラ１７とを備えている。 The water heater 10 adjusts the opening degree of the first heat exchanger 11 connected in the middle of the first forward pipe 2, the first burner 12 that heats the first heat exchanger 11, and the first forward pipe 2. A first water quantity servo 13 (including the function of the first water flow switching valve of the present invention), a first flow rate sensor 14 for detecting the flow rate of hot water supplied from the first forward pipe 2, and the first forward pipe 2 A first temperature sensor 15 that detects the temperature of the flowing hot water, a circulation pump 16 that sucks hot water from the first forward pipe 2 and circulates the hot water in the circulation circuit composed of the first forward pipe 2 and the return pipe 4; And a first hot water controller 17 for controlling the operation of the water heater 10.

なお、第１熱交換器１１と第１バーナ１２とにより、本発明の第１加熱部が構成される。また、第１給湯コントローラ１７は、図示しないＣＰＵ、メモリ等により構成された電子回路ユニットであり、メモリに保持された給湯器１０の制御用プログラムをＣＰＵで実行することによって、給湯器１０の作動を制御する機能を果たす。また、第１往き管２と、給湯器１０とにより、本発明の第１給湯ユニットが構成される。 The first heat exchanger 11 and the first burner 12 constitute a first heating unit of the present invention. The first hot water controller 17 is an electronic circuit unit configured by a CPU, a memory, and the like (not shown). The CPU operates a control program for the hot water heater 10 held in the memory, thereby operating the hot water heater 10. It fulfills the function of controlling. The first forward pipe 2 and the hot water heater 10 constitute a first hot water supply unit of the present invention.

給湯器２０は、第１往き管２から分岐して給湯器１０の上流側と下流側とを連通した分岐管２９の途中に接続されている。給湯器２０は、給湯器１０と同様に、第１熱交換器２１と、第１バーナ２２と、第１水量サーボ２３（本発明の第１通水切換弁の機能を含む）と、第１流量センサ２４と、第１温度センサ２５と、循環ポンプ２６と、給湯コントローラ２７とを備えている。 The water heater 20 is connected to a branch pipe 29 that branches from the first forward pipe 2 and communicates the upstream side and the downstream side of the water heater 10. As with the water heater 10, the water heater 20 includes a first heat exchanger 21, a first burner 22, a first water amount servo 23 (including the function of the first water flow switching valve of the present invention), a first A flow rate sensor 24, a first temperature sensor 25, a circulation pump 26, and a hot water supply controller 27 are provided.

なお、第１熱交換器２１と第１バーナ２２とにより、本発明の第１加熱部が構成される。また、給湯コントローラ２７は、図示しないＣＰＵ、メモリ等により構成された電子回路ユニットであり、メモリに保持された給湯器２０の制御用プログラムをＣＰＵで実行することによって、給湯器２０の作動を制御する機能を果たす。また、分岐管２９（本発明の第１往き管に相当する）と、給湯器１０とにより、本発明の第１給湯ユニットが構成される。 The first heat exchanger 21 and the first burner 22 constitute the first heating unit of the present invention. The hot water controller 27 is an electronic circuit unit configured by a CPU, a memory, and the like (not shown), and controls the operation of the water heater 20 by executing a control program for the water heater 20 held in the memory by the CPU. Fulfills the function of Further, the branch pipe 29 (corresponding to the first forward pipe of the present invention) and the water heater 10 constitute the first hot water supply unit of the present invention.

また、以下では、循環ポンプ１６，２６を備えた給湯器１０，２０をＰ給湯器（ポンプ有り給湯器、本発明の第１給湯器に相当する）１０，２０という。 In the following, the water heaters 10 and 20 provided with the circulation pumps 16 and 26 are referred to as P water heaters (water heaters with pumps, corresponding to the first water heater of the present invention) 10 and 20, respectively.

次に、給湯器３０は、第１往き管２から分岐して、Ｐ給湯器１０，２０の上流側と下流側を連通する第２往き管３の途中に接続されている。給湯器３０は、第２往き管３の途中に接続された第２熱交換器３１と、第２熱交換器３１を加熱する第２バーナ３２と、第２往き管の開度を変更する第２水量サーボ３３（本発明の第２通水切換弁の機能を含む）と、第２往き管３から流入する湯水の流量を検出する第２流量センサ３４と、第２往き管３に流出する湯水の温度を検出する第２温度センサ３５と、給湯器３０の作動を制御する第２給湯コントローラ３７とを備えている。第２往き管３には、第２往き管３から給湯器３０への通水を可能にすると共に、給湯器３０から第２往き管３への通水を不能にする止水弁６が設けられている。 Next, the water heater 30 is branched from the first forward pipe 2 and connected to the middle of the second forward pipe 3 that communicates the upstream side and the downstream side of the P water heaters 10 and 20. The water heater 30 includes a second heat exchanger 31 connected in the middle of the second forward pipe 3, a second burner 32 for heating the second heat exchanger 31, and a second forward pipe for changing the opening degree of the second forward pipe. 2-water quantity servo 33 (including the function of the second water flow switching valve of the present invention), a second flow rate sensor 34 for detecting the flow rate of hot water flowing in from the second forward pipe 3, and the second forward pipe 3 flowing out. A second temperature sensor 35 that detects the temperature of the hot water and a second hot water controller 37 that controls the operation of the water heater 30 are provided. The second forward pipe 3 is provided with a water stop valve 6 that allows water to flow from the second forward pipe 3 to the hot water heater 30 and disables water from the hot water heater 30 to the second forward pipe 3. It has been.

なお、第２熱交換器３１と第２バーナ３２とにより、本発明の第２加熱部が構成される。また、第２給湯コントローラ３７は、図示しないＣＰＵ、メモリ等により構成された電子回路ユニットであり、メモリに保持された給湯器３０の制御用プログラムを実行することによって、給湯器３０の作動を制御する機能を果たす。また、第２往き管３と給湯器３０とにより、本発明の第２給湯ユニットが構成される。 The second heat exchanger 31 and the second burner 32 constitute a second heating unit of the present invention. The second hot water controller 37 is an electronic circuit unit that includes a CPU, a memory, and the like (not shown), and controls the operation of the water heater 30 by executing a control program for the water heater 30 held in the memory. Fulfills the function of The second forward pipe 3 and the hot water heater 30 constitute a second hot water supply unit of the present invention.

給湯器４０は、第２往き管３から分岐して給湯器３０の上流側と下流側とを連通した分岐管４９の途中に接続されている。給湯器４０は、給湯器３０と同様に、第２熱交換器４１と、第２バーナ４２と、第２水量サーボ４３（本発明の第２通水切換弁の機能を含む）と、第２流量センサ４４と、第２温度センサ４５と、第２給湯コントローラ４７とを備えている。 The water heater 40 is connected in the middle of a branch pipe 49 that branches from the second forward pipe 3 and communicates the upstream side and the downstream side of the water heater 30. As with the water heater 30, the water heater 40 includes a second heat exchanger 41, a second burner 42, a second water quantity servo 43 (including the function of the second water flow switching valve of the present invention), a second A flow sensor 44, a second temperature sensor 45, and a second hot water controller 47 are provided.

なお、第２熱交換器４１と第２バーナ４２とにより、本発明の第２加熱部が構成される。また、第２給湯コントローラ４７は、図示しないＣＰＵ、メモリ等により構成された電子回路ユニットであり、メモリに保持された給湯器４０の制御用プログラムを実行することによって、給湯器４０の作動を制御する機能を果たす。また、分岐管４９（本発明の第２往き管に相当する）と、給湯器４０とにより、本発明の第２給湯ユニットが構成される。 In addition, the 2nd heat exchanger 41 and the 2nd burner 42 comprise the 2nd heating part of this invention. The second hot water controller 47 is an electronic circuit unit configured with a CPU, a memory, and the like (not shown), and controls the operation of the hot water heater 40 by executing a control program for the hot water heater 40 held in the memory. Fulfills the function of Further, the branch pipe 49 (corresponding to the second forward pipe of the present invention) and the water heater 40 constitute a second hot water supply unit of the present invention.

給湯器５０は、第２往き管３から分岐して給湯器３０，４０の上流側と下流側とを連通した分岐管５９の途中に接続されている。給湯器５０は、給湯器３０，４０と同様に、第２熱交換器５１と、第２バーナ５２と、第２水量サーボ５３（本発明の第２通水切換弁の機能を含む）と、第２流量センサ５４と、第２温度センサ５５と、給湯コントローラ５７とを備えている。 The water heater 50 is connected to a branch pipe 59 that branches from the second forward pipe 3 and communicates the upstream side and the downstream side of the water heaters 30 and 40. Similarly to the water heaters 30 and 40, the water heater 50 includes a second heat exchanger 51, a second burner 52, a second water amount servo 53 (including the function of the second water flow switching valve of the present invention), A second flow rate sensor 54, a second temperature sensor 55, and a hot water supply controller 57 are provided.

なお、第２熱交換器５１と第２バーナ５２とにより、本発明の第２加熱部が構成される。また、給湯コントローラ５７は、図示しないＣＰＵ、メモリ等により構成された電子回路ユニットであり、メモリに保持された給湯器５０の制御用プログラムを実行することによって、給湯器５０の作動を制御する機能を果たす。また、分岐管５９（本発明の第２往き管に相当する）と給湯器５０とにより、本発明の第２給湯ユニットが構成される。 The second heat exchanger 51 and the second burner 52 constitute a second heating unit of the present invention. The hot water controller 57 is an electronic circuit unit configured by a CPU, a memory, and the like (not shown), and functions to control the operation of the water heater 50 by executing a control program for the water heater 50 held in the memory. Fulfill. Further, the branch pipe 59 (corresponding to the second forward pipe of the present invention) and the water heater 50 constitute the second hot water supply unit of the present invention.

また、以下では、循環ポンプを備えていない給湯器３０，４０，５０をＮ給湯器（ポンプ無し給湯器、本発明の第２給湯器に相当する）３０，４０，５０という。 Hereinafter, the water heaters 30, 40, and 50 that are not provided with the circulation pump are referred to as N water heaters (no-pump water heaters, corresponding to the second water heater of the present invention) 30, 40, and 50.

連結コントローラ６０は、図示しないＣＰＵ、メモリ等を備えた電子回路ユニットであり、各給湯器１０，２０，３０，４０，５０の第１給湯コントローラ１７，２７及び第２給湯コントローラ３７，４７，５７との間で通信を行って、各給湯器１０，２０，３０，４０，５０に対する作動の指示と、各給湯器１０，２０，３０，４０，５０の状態の検知を行う。 The connection controller 60 is an electronic circuit unit including a CPU, a memory, and the like (not shown). The first hot water controller 17, 27 and the second hot water controller 37, 47, 57 of each hot water heater 10, 20, 30, 40, 50. Are communicated with each other to detect the operation of each water heater 10, 20, 30, 40, 50 and the state of each water heater 10, 20, 30, 40, 50.

連結コントローラ６０にはリモコン７０が接続されており、使用者はリモコン７０を操作することによって、出湯栓９から供給される湯の温度（目標給湯温度）、循環保温運転を実行する時間帯（循環保温時間帯）等を設定することができる。 A remote controller 70 is connected to the connection controller 60, and the user operates the remote controller 70, so that the temperature of the hot water supplied from the hot water tap 9 (target hot water supply temperature) and the time zone during which the circulation heat insulation operation is performed (circulation) It is possible to set a heat retention time zone).

以下、図３〜図４に示したフローチャートに従って、連結コントローラ６０による「循環保温運転」と「給湯運転」の実行手順について説明する。なお、連結コントローラ６０が「循環保温運転」と「給湯運転」を実行する構成は、本発明の制御部に相当する。 Hereinafter, in accordance with the flowcharts shown in FIGS. 3 to 4, the execution procedure of the “circulation heat insulation operation” and the “hot water supply operation” by the connection controller 60 will be described. In addition, the structure in which the connection controller 60 performs "circulation heat insulation operation" and "hot water supply operation" corresponds to the control unit of the present invention.

図３は「循環保温運転」のフローチャートである。連結コントローラ６０は、ＳＴＥＰ１で、各給湯器１０，２０，３０，４０，５０の優先度を、循環保温運転用に設定する。連結コントローラ６０は、各給湯器１０，２０，３０，４０，５０の優先度を、図５（ａ）に示した設定表に従って設定する。 FIG. 3 is a flowchart of the “circulation heat retention operation”. The connection controller 60 sets the priority of each water heater 10, 20, 30, 40, 50 for circulation heat insulation operation in STEP1. The connection controller 60 sets the priority of each water heater 10, 20, 30, 40, 50 according to the setting table shown in FIG.

図５（ａ）に示したように、本実施形態では、連結コントローラ６０の接続コネクタＮｏ．１〜Ｎｏ．５に対して、Ｎｏ．４にＰ給湯器１０が接続され、Ｎｏ．５にＰ給湯器２０が接続され、Ｎｏ．１にＮ給湯器３０が接続され、Ｎｏ．２にＮ給湯器４０が接続され、Ｎｏ．３にＮ給湯器５０が接続されている。 As shown in FIG. 5A, in this embodiment, the connection connector No. 1-No. No. 5, no. 4 is connected to the P water heater 10. 5 is connected to the P water heater 20. 1 is connected to the N water heater 30. 2 is connected to an N water heater 40, 3 is connected to an N water heater 50.

そして、連結コントローラ６０は、図５（ａ）の設定表に従って、給湯運転時は、優先順位を、Ｐ給湯器１０→Ｐ給湯器２０→Ｎ給湯器３０→Ｎ給湯器４０→Ｎ給湯器５０の順に優先順位を高くして設定する（給湯運転用の優先順位）。 Then, according to the setting table of FIG. 5A, the connection controller 60 sets the priority order during the hot water supply operation in the order of P water heater 10 → P water heater 20 → N water heater 30 → N water heater 40 → N water heater 50. The priority is set in the order of increasing (priority for hot water supply operation).

また、連結コントローラ６０は、循環保温運転時には、優先順位を、Ｐ給湯器１０，２０→Ｎ給湯器３０→Ｎ給湯器４０→Ｎ給湯器５０の順に優先順位を高くして設定する（循環保温運転用の優先順位）。この場合は、Ｐ給湯器１０，２０は同じ優先順位となる。 Moreover, the connection controller 60 sets the priority order in the order of the P water heaters 10, 20 → N water heater 30 → N water heater 40 → N water heater 50 in the order of circulation heat insulation operation (circulation heat insulation). Driving priority). In this case, the P water heaters 10 and 20 have the same priority.

続くＳＴＥＰ２で、連結コントローラ６０は、優先順位に応じて、Ｐ給湯器１０，２０については、第１水量サーボ１３，２３の開弁を指示する制御を送信する。さらに、連結コントローラ６０は、Ｎ給湯器４０，５０に対して、第２水量サーボ４３，５３の閉弁を指示する制御信号を送信する。 In subsequent STEP 2, the connection controller 60 transmits a control for instructing the valve opening of the first water quantity servos 13 and 23 for the P water heaters 10 and 20 according to the priority order. Furthermore, the connection controller 60 transmits a control signal that instructs the N water heaters 40 and 50 to close the second water amount servos 43 and 53.

これにより、図１及び図５（ａ）に示したように、Ｐ給湯器１０，１１及びＮ給湯器３０については、第１水量サーボ１３，２３及び第２水量サーボ３３が開弁した状態（通水可能状態、図２，３では白抜きの三角で示している）になる。また、Ｎ給湯器４０，５０については、第２水量サーボ４３，５３が閉弁した状態（通水不能状態、図２，３では黒抜きの三角で示している）になる。 Thereby, as shown in FIG.1 and FIG.5 (a), about the P water heaters 10 and 11 and the N water heater 30, the 1st water quantity servos 13 and 23 and the 2nd water quantity servo 33 have opened the valve ( The water can be passed, which is indicated by white triangles in FIGS. Further, the N water heaters 40 and 50 are in a state in which the second water amount servos 43 and 53 are closed (in a state where water cannot flow, which are indicated by black triangles in FIGS. 2 and 3).

次のＳＴＥＰ３で、連結コントローラ６０は、Ｐ給湯器１０，２０の第１給湯コントローラ１７，２７に対して、循環開始を指示する制御信号を送信する。この制御信号を受信した第１給湯コントローラ１７，２７は、循環ポンプ１６，２６の作動を開始し、これにより、図１に示したように、第１往き管２及び分岐管２９と戻り管４から成る循環回路内の湯水の循環が開始される。 In the next STEP 3, the connection controller 60 transmits a control signal instructing the start of circulation to the first hot water supply controllers 17 and 27 of the P water heaters 10 and 20. The first hot water supply controllers 17 and 27 that have received this control signal start the operation of the circulation pumps 16 and 26, and as a result, as shown in FIG. 1, the first forward pipe 2, the branch pipe 29 and the return pipe 4. Circulation of hot water in the circulation circuit consisting of

第１給湯コントローラ１７は、第１流量センサ１４の検出流量が給湯検知流量（点火流量）以上であるときに、第１温度センサ１５の検出温度が目標給湯温度となるように、第１バーナ１２の火力を制御する。同様に、給湯コントローラ２７は、第１流量センサ２４の検出流量が給湯検知流量以上であるときに、第１温度センサ２５の検出流量が目標給湯温度となるように、第１バーナ２２の火力を制御する。 When the detected flow rate of the first flow sensor 14 is equal to or higher than the detected hot water supply flow rate (ignition flow rate), the first hot water controller 17 controls the first burner 12 so that the detected temperature of the first temperature sensor 15 becomes the target hot water temperature. Control the firepower. Similarly, the hot water controller 27 reduces the heating power of the first burner 22 so that the detected flow rate of the first temperature sensor 25 becomes the target hot water temperature when the detected flow rate of the first flow sensor 24 is equal to or higher than the detected hot water flow rate. Control.

これにより、第１往き管２及び分岐管２９と戻り管４から成る循環回路内の湯水が、Ｐ給湯器１０，２０で加熱されながら循環する「循環保温運転」が開始される。 As a result, the “circulation heat insulation operation” is started in which hot water in the circulation circuit composed of the first forward pipe 2 and the branch pipe 29 and the return pipe 4 is circulated while being heated by the P water heaters 10 and 20.

次のＳＴＥＰ４で、連結コントローラ６０は、各給湯器１０，２０，３０，４０，５０の第１給湯コントローラ１７，２７及び第２給湯コントローラ３７，４７，５７に対して、流量センサ（第１流量センサ１４，２４、第２流量センサ３４，４４，５４）の検出流量のデータ送信を要求する制御信号を送信する。そして、第１給湯コントローラ１７，２７及び第２給湯コントローラ３７，４７，５７から、流量センサ（第１流量センサ１４，２４、第２流量センサ３４，４４，５４）の検出流量のデータを受信する。 In the next STEP 4, the connection controller 60 sends a flow sensor (first flow rate) to the first hot water controller 17, 27 and the second hot water controller 37, 47, 57 of each hot water heater 10, 20, 30, 40, 50. A control signal requesting data transmission of the detected flow rate of the sensors 14, 24 and the second flow rate sensors 34, 44, 54) is transmitted. And the data of the detected flow volume of the flow sensor (1st flow sensor 14, 24, 2nd flow sensor 34, 44, 54) is received from the 1st hot water controller 17,27 and the 2nd hot water controller 37,47,57. .

続くＳＴＥＰ５で、連結コントローラ６０は、「循環保温運転」の実行中に、循環保温条件が成立しているか否かを判断する。循環保温条件としては、以下の二つの条件の少なくともいずれかが満たされることが設定されている。 In subsequent STEP 5, the connection controller 60 determines whether or not the circulation heat insulation condition is satisfied during the execution of the “circulation heat insulation operation”. As the circulation heat insulation condition, it is set that at least one of the following two conditions is satisfied.

（ａ）リモコン７０により設定された循環保温時間帯である、
（ｂ）リモコン７０により循環保温の開始操作がなされた。 (A) It is a circulation heat insulation time zone set by the remote controller 70.
(B) An operation to start circulating heat insulation was performed by the remote controller 70.

循環保温条件が成立しているときはＳＴＥＰ６に進み、連結コントローラ６０は、Ｎ給湯器３０の第２流量センサ３４の検出流量が、給湯検知流量以上であるか否かを判断する。 When the circulation heat insulation condition is established, the process proceeds to STEP 6 and the connection controller 60 determines whether or not the detected flow rate of the second flow rate sensor 34 of the N water heater 30 is equal to or higher than the detected hot water flow rate.

ＳＴＥＰ６で、第２流量センサ３４の検出流量が給湯検知流量未満であるときは、第２往き管３からＮ給湯器３０に湯水が流入していない状態であるので、出湯栓９が閉栓されていると判断することができる。そのため、この場合はＳＴＥＰ５に戻り、連結コントローラ６０は、「循環保温運転」の制御を継続する。 In STEP 6, when the detected flow rate of the second flow rate sensor 34 is less than the hot water supply detection flow rate, the hot water tap 9 is closed because no hot water is flowing from the second forward pipe 3 into the N water heater 30. Can be determined. Therefore, in this case, the process returns to STEP 5 and the connection controller 60 continues the control of the “circulation heat insulation operation”.

一方、ＳＴＥＰ６で、第２流量センサ３４の検出流量が給湯検知流量以上であるときには、第２往き管３からＮ給湯器３０に湯水が流入している状態であるので、出湯栓９が開栓されていると判断することができる。 On the other hand, when the detected flow rate of the second flow rate sensor 34 is equal to or higher than the hot water supply detection flow rate in STEP 6, hot water is flowing from the second forward pipe 3 into the N water heater 30, so that the hot water tap 9 is opened. Can be determined.

そのため、この場合はＳＴＥＰ７に進み、連結コントローラ６０は、Ｐ給湯器１０の第１給湯コントローラ１７及びＰ給湯器２０の第１給湯コントローラ２７に対して、循環ポンプ１６，２６の停止を指示する制御信号を送信して、循環ポンプ１６，２６を停止させる。 Therefore, in this case, the process proceeds to STEP 7, and the connection controller 60 instructs the first hot water controller 17 of the P water heater 10 and the first hot water controller 27 of the P water heater 20 to stop the circulation pumps 16 and 26. A signal is transmitted to stop the circulation pumps 16 and 26.

続くＳＴＥＰ８で、連結コントローラ６０は、各給湯器１０，２０，３０，４０，５０の優先順位を、図５（ａ）に示した給湯運転用の優先順位に設定する。次のＳＴＥＰ９で、連結コントローラ６０は、優先順位に従って、優先順位が最も高いＰ給湯器１０の第１給湯コントローラ１７に対して、第１水量サーボ１３の開弁を指示する信号を送信し、他の給湯器２０，３０，４０，５０の第１給湯コントローラ２７及び第２給湯コントローラ３７，４７，５７に対しては、水量サーボ２３，３３，４３、５３の閉弁を指示する制御信号を送信する。 In subsequent STEP 8, the connection controller 60 sets the priority order of the water heaters 10, 20, 30, 40, 50 to the priority order for the hot water supply operation shown in FIG. In the next STEP 9, the connection controller 60 transmits a signal instructing the valve opening of the first water quantity servo 13 to the first hot water supply controller 17 of the P water heater 10 having the highest priority according to the priority order. A control signal instructing the valve closing of the water amount servos 23, 33, 43, 53 is transmitted to the first hot water controller 27 and the second hot water controllers 37, 47, 57 of the hot water heaters 20, 30, 40, 50. To do.

これにより、Ｐ給湯器１０の第１水量サーボ１３のみが開弁して、他の給湯器２０，３０，４０，５０の水量サーボ２３，３３，４３，５３が閉弁した状態となる。そして、続くＳＴＥＰ９に進んで、連結コントローラ６０は「循環保温運転」から「給湯運転」の制御に移行する。 As a result, only the first water amount servo 13 of the P water heater 10 is opened, and the water amount servos 23, 33, 43, 53 of the other water heaters 20, 30, 40, 50 are closed. Then, proceeding to STEP 9, the connection controller 60 shifts from “circulation heat insulation operation” to “hot water supply operation” control.

また、ＳＴＥＰ５で循環保温運転が成立していなかったときにも、ＳＴＥＰ７に分岐し、連結コントローラ６０は、「循環保温運転」から「給湯運転」の制御に移行する。 Further, even when the circulation heat insulation operation is not established in STEP 5, the process branches to STEP 7, and the connection controller 60 shifts from “circulation heat insulation operation” to “hot water supply operation” control.

次に、図４を参照して、連結コントローラ６０による「給湯運転」の実行手順について説明する。 Next, referring to FIG. 4, the execution procedure of the “hot water supply operation” by the connection controller 60 will be described.

図４のＳＴＥＰ２０で、優先度１〜３のＰ給湯器１０，２０の第１給湯コントローラ１７，２７及びＮ給湯器３０の第２給湯コントローラ３７に対して、水量サーボ（第１水量サーボ１３，２３、第２水量サーボ３３）の開弁を指示する信号を送信し、優先度４〜５のＰ給湯器４０，５０の第２給湯コントローラ４７，５７に対して水量サーボ（第２水量サーボ４３，５３）の閉弁を指示する制御信号を送信する。これにより、図２に示したように、Ｐ給湯器１０，２０の第１水量サーボ１３，２３及びＮ給湯器３０の第２水量サーボ３３が開弁し、Ｐ給湯器４０，５０の第２水量サーボ４３，５３が閉弁した状態となる。 In STEP 20 of FIG. 4, the water amount servo (the first water amount servo 13, the first water amount servo 13, the first hot water controller 17, 27 of the P water heaters 10, 20 of priority 1 to the second hot water controller 37 of the N water heater 30 is selected. 23, a second water amount servo 33) is transmitted, and a water amount servo (second water amount servo 43) is transmitted to the second hot water controllers 47 and 57 of the P water heaters 40 and 50 having the priorities 4 to 5. , 53) is transmitted. As a result, as shown in FIG. 2, the first water amount servos 13 and 23 of the P water heaters 10 and 20 and the second water amount servo 33 of the N water heater 30 are opened, and the second water amount servos 33 of the P water heaters 40 and 50 are opened. The water quantity servos 43 and 53 are closed.

図２では、開弁状態にある第１水量サーボ１３，２３及び第２水量サーボ３３を白抜きの三角で表し、閉弁状態にある第２水量サーボ４３，５３を黒抜きの三角で表している。図２の状態では、Ｐ給湯器１０，２０の第１熱交換器１１，２１及びＮ給湯器３０の第２熱交換器３１で加熱された湯が、出湯栓９から供給される。 In FIG. 2, the first water volume servos 13 and 23 and the second water volume servo 33 in the valve open state are represented by white triangles, and the second water volume servos 43 and 53 in the valve closed state are represented by black triangles. Yes. In the state of FIG. 2, hot water heated by the first heat exchangers 11, 21 of the P water heaters 10, 20 and the second heat exchanger 31 of the N water heater 30 is supplied from the hot water tap 9.

続くＳＴＥＰ２１で、連結コントローラ６０は、Ｐ給湯器１０，２０及びＮ給湯器３０，４０，５０の第１給湯コントローラ１７，２７及び第２給湯コントローラ３７，４７，５７に対して、第１流量センサ１４，２４及び第２流量センサ３４，４４，５４の検出流量のデータを要求する信号をそれぞれ送信する。 In subsequent STEP 21, the connection controller 60 detects the first flow rate sensor for the first hot water controller 17, 27 and the second hot water controller 37, 47, 57 of the P water heater 10, 20 and the N water heater 30, 40, 50. 14 and 24 and signals for requesting data of the detected flow rates of the second flow rate sensors 34, 44 and 54, respectively.

そして、連結コントローラ６０は、第１給湯コントローラ１７，２７及び第２給湯コントローラ３７，４７，５７から、第１流量センサ１４，２４及び第２流量センサ３４，４４，５４の検出流量のデータをそれぞれ受信して、第１流量センサ１４，２４及び第２流量センサ３４，４４，５４の検出流量を認識する。 Then, the connection controller 60 receives the detected flow rate data of the first flow rate sensors 14, 24 and the second flow rate sensors 34, 44, 54 from the first hot water supply controllers 17, 27 and the second hot water supply controllers 37, 47, 57, respectively. It receives and recognizes the detected flow rates of the first flow sensors 14, 24 and the second flow sensors 34, 44, 54.

続くＳＴＥＰ２２で、連結コントローラ６０は、第１流量センサ１４，２４及び第２流量センサ３４，４４，５４の検出流量の総量が、水無し（検出流量の総量がゼロ）であるか否かを判断する。そして、検出流量の総流量が水無しでなかったときはＳＴＥＰ２３に進み、連結コントローラ６０は、検出流量の総量に基づいて給湯能力が不足しているか否かを判断している。また、ＳＴＥＰ２２で、検出流量の総量が水無しであったときには、ＳＴＥＰ３０に分岐し、連結コントローラ６０は、循環保温条件の成立の有無を判断する。 In subsequent STEP 22, the connection controller 60 determines whether or not the total amount of the detected flow rate of the first flow rate sensors 14, 24 and the second flow rate sensors 34, 44, 54 is no water (the total amount of the detected flow rate is zero). To do. Then, when the total detected flow rate is not water, the process proceeds to STEP 23, and the connection controller 60 determines whether or not the hot water supply capacity is insufficient based on the total detected flow rate. In STEP 22, when the total amount of the detected flow rate is no water, the process branches to STEP 30, and the connection controller 60 determines whether or not the circulation heat insulation condition is satisfied.

具体的は、連結コントローラ６０は、検出流量の総量が予め設定された複数段階の閾値を超えるごとに、給湯能力が不足していると判断してＳＴＥＰ２４に進む。そして、連結コントローラ６０は、５台の給湯器１０，２０，３０，４０，５０について、水量サーボ（第１水量サーボ１３，２３、第２水量サーボ３３，４３，５３）が閉栓されている給湯器のうち、優先度が最も高い給湯器の水量サーボを開栓して、運転状態（流通する水の加熱を行う状態）である給湯器の台数を増加させて、ＳＴＥＰ２２に戻る。 Specifically, the connection controller 60 determines that the hot water supply capacity is insufficient every time the total amount of the detected flow rate exceeds a preset threshold value in a plurality of stages, and proceeds to STEP24. And the connection controller 60 is the hot water supply with which the water quantity servo (1st water quantity servo 13,23, 2nd water quantity servo 33,43,53) is plugged about five water heaters 10,20,30,40,50. Among the water heaters, the water amount servo of the water heater with the highest priority is opened to increase the number of water heaters in the operating state (the state of heating the circulating water), and the process returns to STEP 22.

一方、ＳＴＥＰ２３で、給湯能力が不足してないと判断したときにはＳＴＥＰ４０に分岐し、連結コントローラ６０は、給湯能力が過剰であるか否かを判断する。具体的には、連結コントローラ６０は、第１流量センサ１４，２４及び第２流量センサ３４，４４，５４の検出流量の総量が前記複数段階の閾値よりも少なくなるごとに、給湯能力が過剰であると判断してＳＴＥＰ４１に進む。 On the other hand, if it is determined in STEP 23 that the hot water supply capacity is not insufficient, the process branches to STEP 40, and the connection controller 60 determines whether the hot water supply capacity is excessive. Specifically, the connection controller 60 has an excessive hot water supply capacity each time the total amount of the detected flow rate of the first flow rate sensors 14, 24 and the second flow rate sensors 34, 44, 54 becomes smaller than the threshold value in the plurality of stages. It judges that there exists, and progresses to STEP41.

そして、連結コントローラ６０は、５台の給湯器１０，２０，３０，４０，５０について、水量サーボ（第１水量サーボ１３，２３、第２水量サーボ３３，４３，５３）が開栓されている給湯器（運転状態にある給湯器）のうち、優先度が最も低い給湯器の水量サーボを閉栓して、運転状態である給湯器の台数を減少させる。 In the connection controller 60, the water quantity servos (first water quantity servos 13, 23, second water quantity servos 33, 43, 53) are opened for the five water heaters 10, 20, 30, 40, 50. Among the water heaters (water heaters in the operating state), the water amount servo of the water heater with the lowest priority is closed to reduce the number of water heaters in the operating state.

また、ＳＴＥＰ４０で給湯能力が過剰でないと判断したときにはＳＴＥＰ４０からＳＴＥＰ２２に進み、この場合は、運転状態にある給湯器の台数は変更されない。 If it is determined in STEP 40 that the hot water supply capacity is not excessive, the process proceeds from STEP 40 to STEP 22. In this case, the number of water heaters in the operating state is not changed.

なお、本実施形態では、図５（ａ）に示したように、Ｐ給湯器１０，２０と、Ｎ給湯器３０，４０，５０とに対して、連続して優先度を設定したが、図５（ｂ）に示したように、Ｐ給湯器１０，２０とＮ給湯器３０，４０，５０を区別して、優先順位を設定してもよい。 In addition, in this embodiment, as shown to Fig.5 (a), although the priority was continuously set with respect to P water heater 10,20 and N water heater 30,40,50, As shown in FIG. 5B, the priority order may be set by distinguishing between the P water heaters 10, 20 and the N water heaters 30, 40, 50.

この場合は、例えば、循環保温運転時に、循環負荷に応じてＰ給湯器１０の循環ポンプ１６のみを作動させる場合と、Ｐ給湯器１０の循環ポンプ１６及びＰ給湯器２０の循環ポンプ２６の双方を作動させる場合とを切換える制御を行うことができる。また、給湯運転時に、Ｎ給湯器３０，４０，５０をＰ給湯器１０，２０よりも優先的に作動させて、各給湯器１０，２０，３０，４０，５０の総稼働時間の均一化を図る制御を行うことができる。 In this case, for example, when only the circulation pump 16 of the P water heater 10 is operated according to the circulation load during the circulation heat insulation operation, both the circulation pump 16 of the P water heater 10 and the circulation pump 26 of the P water heater 20 are used. It is possible to perform control to switch between the cases where the is operated. In addition, during the hot water supply operation, the N water heaters 30, 40, 50 are preferentially operated over the P water heaters 10, 20, so that the total operation time of each of the water heaters 10, 20, 30, 40, 50 is made uniform. Control can be performed.

また、本実施形態では、連結コントローラ６０を、給湯器１０，２０，３０，４０，５０とは別に設けた例を示したが、連結コントローラ６０の機能をいずれかの給湯器の給湯コントローラに持たせた構成としてもよい。この場合、リモコンは給湯コントローラに接続される構成となる。 Moreover, although the example which provided the connection controller 60 separately from the water heaters 10, 20, 30, 40, 50 was shown in this embodiment, it has the function of the connection controller 60 in the hot water controller of one of the water heaters. It is good also as the structure which made it. In this case, the remote controller is connected to the hot water supply controller.

また、本実施形態ではＰ給湯器２台とＮ給湯器３台を備えた即時給湯システムを示したが、Ｐ給湯器とＮ給湯器を少なくとも１台ずつ備えた即時給湯システムであれば、本発明の適用が可能である。 In the present embodiment, an instant hot water supply system including two P water heaters and three N water heaters is shown. However, if an immediate hot water system includes at least one P water heater and one N water heater, The invention can be applied.

また、本実施形態では、バーナ（ガスバーナ、灯油バーナ等）を備えた給湯器を示したが、電気等の他の種類の熱源を使用する給湯器を用いてもよい。 Moreover, although the water heater provided with the burner (a gas burner, a kerosene burner, etc.) was shown in this embodiment, you may use the water heater using other types of heat sources, such as electricity.

１…即時給湯システム、２…第１往き管、３…第２往き管、４…戻り管、５，６…逆止弁、２９，３９，４９，５９…分岐管、１０，２０…Ｐ（循環ポンプ有り）給湯器、１７，２７…第１給湯コントローラ、３０，４０，５０…Ｎ（循環ポンプ無し）給湯器、１１，１２…第１熱交換器、１２，２２…第１バーナ、１３，２４…第１水量サーボ、１４，２４…第１流量センサ、１５，２５…第１温度センサ、１６，２６…循環ポンプ、３１，４１，５１…第２熱交換器、３２，４２，５２…第２バーナ、３３，４３，５３…第２水量サーボ、３４，４４，５４…第２流量センサ、３７，４７，５７…第２給湯コントローラ、６０…連結コントローラ、７０…リモコン。 DESCRIPTION OF SYMBOLS 1 ... Instant hot water supply system, 2 ... 1st forward pipe, 3 ... 2nd forward pipe, 4 ... Return pipe, 5,6 ... Check valve, 29, 39, 49, 59 ... Branch pipe, 10, 20 ... P ( Water heater, with circulation pump) 17, 27 ... First hot water controller, 30, 40, 50 ... N (without circulation pump) Water heater, 11, 12 ... First heat exchanger, 12, 22 ... First burner, 13 , 24 ... 1st water quantity servo, 14, 24 ... 1st flow sensor, 15, 25 ... 1st temperature sensor, 16, 26 ... Circulation pump, 31, 41, 51 ... 2nd heat exchanger, 32, 42, 52 ... 2nd burner, 33, 43, 53 ... 2nd water quantity servo, 34, 44, 54 ... 2nd flow sensor, 37, 47, 57 ... 2nd hot water supply controller, 60 ... Connection controller, 70 ... Remote control.

Claims

A first forward pipe having one end connected to the water supply and the other end connected to a tap;
A return pipe communicating between one end and the other end of the first forward pipe;
Circulation connected to the middle of the first forward pipe for circulating hot water in a circulation circuit comprising a first heating section for heating the hot water flowing through the first forward pipe, and the first forward pipe and the return pipe. A first water heater comprising a pump;
A second forward pipe communicating with the upstream side and the downstream side of the first hot water heater of the first forward pipe;
A second heating unit connected in the middle of the second forward pipe for heating the hot water flowing through the second forward pipe; and a second flow rate sensor for detecting a flow rate of hot water flowing from the second forward pipe. A second water heater provided,
A check valve that allows water to flow from the second forward pipe to the second hot water heater and disables water from the second hot water heater to the second forward pipe;
When the detected flow rate of the second flow rate sensor is less than a predetermined hot water supply detection flow rate, a circulation heat retention operation for operating the first heating unit is performed in a state where the circulation pump is operated, and the second flow rate sensor When the detected flow rate is equal to or higher than the detected hot water supply flow rate, a control for executing a hot water supply operation for operating at least one of the first heating unit and the second heating unit with the circulation pump stopped. An instant hot water supply system characterized by comprising a part.

In the instant hot water supply system according to claim 1,
The second water heater includes a water flowable state in which water can be passed from the second forward pipe to the second heating unit, and a water passage incapable of passing water from the second forward pipe to the second heating unit. A second water flow switching valve that switches between water-impossible states,
A plurality of second hot water supply units having the second water heater, the second forward pipe, and the check valve;
The controller is configured to allow at least one of the plurality of second water heaters to pass through the second water flow switching valve, to perform the circulation heat insulation operation, and during the execution of the circulation heat insulation operation, When the detected flow rate of the second flow rate sensor of the second water heater that is in a water flowable state becomes equal to or higher than the detected hot water flow rate, the circulating heat insulation operation is terminated and the hot water supply operation is executed.
During execution of the hot water supply operation, the number of second water heaters that are allowed to pass water is changed according to the total amount of flow detected by the second flow rate sensor of the second water heater that is allowed to pass water. Instant hot water supply system characterized by that.

In the immediate hot water supply system according to claim 1 or claim 2,
The first water heater includes a first flow rate sensor that detects a flow rate of hot water flowing from the first forward pipe, and a flowable state in which water can be passed from the first forward pipe to the first heating unit. A first water flow switching valve that switches between a water non-flowable state in which water cannot be passed from the first forward pipe to the first heating unit,
A plurality of first hot water supply units having the first water heater and the first forward pipe;
The control unit is configured to allow water to flow in accordance with a total amount of flow detected by the first flow rate sensor of the first water heater that is in a water flowable state during execution of the hot water supply operation. Instant hot water supply system characterized by changing the number of units.