JP6851152B2 - Heating device - Google Patents

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JP6851152B2
JP6851152B2 JP2016144594A JP2016144594A JP6851152B2 JP 6851152 B2 JP6851152 B2 JP 6851152B2 JP 2016144594 A JP2016144594 A JP 2016144594A JP 2016144594 A JP2016144594 A JP 2016144594A JP 6851152 B2 JP6851152 B2 JP 6851152B2
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temperature
exhaust
detecting means
burner
abnormality
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JP2018013314A (en
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茂輝 島田
茂輝 島田
誉樹 竹内
誉樹 竹内
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Rinnai Corp
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Description

本発明は、バーナの燃焼排気により加熱される熱交換器を備える暖房装置に関する。 The present invention relates to a heating device including a heat exchanger that is heated by the combustion exhaust of a burner.

暖房装置は、バーナと、バーナの燃焼排気により加熱される熱交換器と、熱交換器により加熱された温水を循環ポンプで循環する循環路とを備える。循環路の途中には、室内に設置されるヒータが設けられている。熱交換器により加熱された温水は、ヒータが設けられた循環路を循環し、ヒータからの放熱により室内の暖房が行われる。 The heating device includes a burner, a heat exchanger heated by the combustion exhaust of the burner, and a circulation path for circulating hot water heated by the heat exchanger with a circulation pump. A heater installed indoors is provided in the middle of the circulation path. The hot water heated by the heat exchanger circulates in a circulation path provided with a heater, and heat is dissipated from the heater to heat the room.

暖房装置には、バーナの燃焼により発生する燃焼排ガスを外部に排出するための排気管が接続されている。特許文献１に記載の熱交換装置では、排気通路（排気管）の内部の温度を検出する排気温センサ（排気温度検出手段）を設けている。排気温センサが短絡や断線した場合には、排気温センサで正常に温度を検出することができず、検出温度が適正温度から外れることがある。特許文献１に記載の熱交換装置では、バーナの燃焼中に排気温センサでの検出温度が適正温度から外れた場合には、バーナへのガス回路に挿入されたガス量調整弁の開度を絞り、バーナの燃焼量を低下させている。このような制御を行い、排気管に流れる燃焼排ガスの温度を下げることで、排気温センサが短絡や断線した場合に対処している。 An exhaust pipe for exhausting the combustion exhaust gas generated by the combustion of the burner to the outside is connected to the heating device. The heat exchange device described in Patent Document 1 is provided with an exhaust temperature sensor (exhaust temperature detecting means) that detects the temperature inside the exhaust passage (exhaust pipe). If the exhaust temperature sensor is short-circuited or disconnected, the exhaust temperature sensor may not be able to detect the temperature normally, and the detected temperature may deviate from the appropriate temperature. In the heat exchange device described in Patent Document 1, when the temperature detected by the exhaust temperature sensor deviates from the appropriate temperature during combustion of the burner, the opening degree of the gas amount adjusting valve inserted in the gas circuit to the burner is adjusted. The amount of combustion of the squeezing and burner is reduced. By performing such control and lowering the temperature of the combustion exhaust gas flowing through the exhaust pipe, a short circuit or disconnection of the exhaust temperature sensor is dealt with.

特開平８−２２６７０３号公報Japanese Unexamined Patent Publication No. 8-226703

特許文献１に記載の熱交換装置では、排気温センサが短絡や断線した場合には対処しているが、排気温センサの故障には、排気温センサの出力値が実際の温度に対して所定値ずれた状態で出力される中間故障もある。この中間故障では、排気温センサでの検出温度が適正温度であると判断されることがあり、この場合、排気温センサの異常を検出することができない。 The heat exchange device described in Patent Document 1 deals with a short circuit or disconnection of the exhaust temperature sensor, but when the exhaust temperature sensor fails, the output value of the exhaust temperature sensor is predetermined with respect to the actual temperature. There is also an intermediate failure that is output in a state where the value is off. In this intermediate failure, it may be determined that the temperature detected by the exhaust temperature sensor is an appropriate temperature, and in this case, the abnormality of the exhaust temperature sensor cannot be detected.

本発明は、このような事情に鑑みてなされたものであり、排出温度を検出する温度センサの故障を確実に検知することができる暖房装置を提供することを目的とする。 The present invention has been made in view of such circumstances, and an object of the present invention is to provide a heating device capable of reliably detecting a failure of a temperature sensor that detects an exhaust temperature.

本発明の暖房装置は、熱媒が流通する循環路と、前記循環路の途中に設けられた暖房端末と、前記循環路の途中の前記暖房端末よりも上流側に設けられた熱交換器と、前記熱交換器を加熱するバーナと、前記バーナの燃焼排ガスを外部に排出する排気管と、前記バーナを燃焼させることにより、前記熱交換器で加熱された熱媒を前記暖房端末に流通させる暖房運転を実行する暖房制御手段と、前記熱交換器に流入する熱媒の温度を検出する流入水温度検出手段と、前記排気管の下流側の内部の温度を検出する排気温度検出手段と、前記暖房運転実行中に、前記排気温度検出手段での検出温度が、前記流入水温度検出手段での検出温度以下となった場合に、前記排気温度検出手段の異常を検知する異常検知手段と、前記バーナを内蔵する缶体と、を備え、前記循環路は、前記熱交換器を通過して前記缶体から出た後に、前記暖房端末よりも上流側で再び前記缶体を通過することを特徴とする。 The heating device of the present invention includes a circulation path through which a heat medium flows, a heating terminal provided in the middle of the circulation path, and a heat exchanger provided in the middle of the circulation path on the upstream side of the heating terminal. By burning the burner that heats the heat exchanger, the exhaust pipe that discharges the combustion exhaust gas of the burner to the outside, and the burner, the heat medium heated by the heat exchanger is circulated to the heating terminal. A heating control means for executing the heating operation, an inflow water temperature detecting means for detecting the temperature of the heat medium flowing into the heat exchanger, and an exhaust temperature detecting means for detecting the temperature inside the downstream side of the exhaust pipe. When the detection temperature by the exhaust temperature detecting means becomes equal to or lower than the detection temperature by the inflow water temperature detecting means during the heating operation, the abnormality detecting means for detecting the abnormality of the exhaust temperature detecting means and the abnormality detecting means. A can body including the burner, and the circulation path passes through the can body again on the upstream side of the heating terminal after passing through the heat exchanger and exiting the can body. It is a feature.

本発明によれば、バーナを燃焼し、熱交換器により熱媒を加熱（例えば、８０°Ｃ）した際に、排気温度検出手段が正常に作動していれば、排気温度検出手段には、バーナの燃焼排ガスが送られ、排気温度検出手段での検出温度は、熱交換器に流入する流入水温度検出手段での検出温度（例えば、６０°Ｃ）を超える、例えば６５°Ｃ程度となる。この点に着目して、排気温度検出手段での検出温度が、流入水温度検出手段での検出温度以下である場合に、排気温度検出手段の異常を検知するので、容易に排気温度検出手段の異常を検知することができる。さらに、流入水温度検出手段での検出温度（例えば、６０°Ｃ）と、排気温度検出手段での検出温度（例えば、６５°Ｃ）とは温度差が小さいため、排気温度検出手段に異常がある場合に、排気温度検出手段での検出温度が、流入水温度検出手段での検出温度以下になりやすく、異常を早期に検知することができる。 According to the present invention, when the burner is burned and the heat medium is heated by the heat exchanger (for example, 80 ° C.), if the exhaust temperature detecting means is operating normally, the exhaust temperature detecting means may be used. The combustion exhaust gas of the burner is sent, and the detection temperature by the exhaust temperature detecting means exceeds the detection temperature (for example, 60 ° C) by the inflow water temperature detecting means flowing into the heat exchanger, for example, about 65 ° C. .. Focusing on this point, when the detection temperature by the exhaust temperature detecting means is equal to or lower than the detected temperature by the inflow water temperature detecting means, the abnormality of the exhaust temperature detecting means is detected, so that the exhaust temperature detecting means can be easily used. Abnormality can be detected. Further, since the temperature difference between the temperature detected by the inflow water temperature detecting means (for example, 60 ° C) and the temperature detected by the exhaust temperature detecting means (for example, 65 ° C) is small, there is an abnormality in the exhaust temperature detecting means. In some cases, the temperature detected by the exhaust temperature detecting means tends to be equal to or lower than the temperature detected by the inflow water temperature detecting means, and an abnormality can be detected at an early stage.

また、前記排気温度検出手段での検出温度が所定温度以上である場合、又は前記異常検知手段が前記排気温度検出手段の異常を検知した場合に、前記バーナの燃焼を停止する燃焼停止手段を備えることが好ましい。 Further, the combustion stopping means for stopping the combustion of the burner is provided when the detection temperature by the exhaust temperature detecting means is equal to or higher than a predetermined temperature or when the abnormality detecting means detects an abnormality of the exhaust temperature detecting means. Is preferable.

この構成によれば、排気温度検出手段での検出温度が所定温度以上である場合、又は異常検知手段が排気温度検出手段の異常を検知した場合に、バーナの燃焼を停止するので、排気温度検出手段の異常に起因して、高い温度の燃焼排ガスが排気管に流れることがなく、例えば、排気管の材質が塩化ビニールであり、耐熱温度が低い材質である場合でも、加熱によって破損することを防止することができる。 According to this configuration, when the detection temperature by the exhaust temperature detecting means is equal to or higher than a predetermined temperature, or when the abnormality detecting means detects an abnormality in the exhaust temperature detecting means, the combustion of the burner is stopped, so that the exhaust temperature is detected. Due to an abnormality in the means, high-temperature combustion exhaust gas does not flow into the exhaust pipe. For example, even if the material of the exhaust pipe is vinyl chloride and the heat-resistant temperature is low, it will be damaged by heating. Can be prevented.

さらに、前記異常検知手段が前記排気温度検出手段の異常を検知した場合に、前記バーナの燃焼量を所定量低下させる燃焼量制御手段を備えることが好ましい。 Further, it is preferable to provide a combustion amount control means for reducing the combustion amount of the burner by a predetermined amount when the abnormality detecting means detects an abnormality of the exhaust temperature detecting means.

この構成によれば、異常検知手段が排気温度検出手段の異常を検知した場合に、バーナの燃焼量を所定量低下させることにより、一時的な異常検知であれば、再び検出温度による異常判定を行った場合には、異常が検知されないようにすることができる。これにより、恒久的な異常のみ検知することができる。 According to this configuration, when the abnormality detecting means detects an abnormality of the exhaust temperature detecting means, the combustion amount of the burner is reduced by a predetermined amount, and if it is a temporary abnormality detection, the abnormality determination based on the detected temperature is performed again. If so, it is possible to prevent the abnormality from being detected. As a result, only permanent abnormalities can be detected.

本実施形態の暖房装置のシステム構成図。The system configuration diagram of the heating device of this embodiment. 排気温度センサの異常の有無を検知する処理の流れを示すフローチャート。A flowchart showing a flow of processing for detecting the presence or absence of an abnormality in the exhaust temperature sensor.

図１に示すように、暖房装置１は、バーナ２と、このバーナ２を内蔵する缶体３とを備えている。缶体３は、バーナ２を収容する燃焼室３ａと、燃焼室３ａから延びて燃焼排ガスを排気するための排気路３ｂとを備えている。 As shown in FIG. 1, the heating device 1 includes a burner 2 and a can body 3 incorporating the burner 2. The can body 3 includes a combustion chamber 3a for accommodating the burner 2 and an exhaust passage 3b extending from the combustion chamber 3a to exhaust the combustion exhaust gas.

燃焼室３ａには、バーナ２に点火するための点火プラグ４と、バーナ２の着火を検知するフレームロッド５とが設けられている。排気路３ｂの下流端部には、燃焼排ガスを外部に排出するための例えば塩化ビニール製の排気管６が接続されている。また、排気路３ｂの下流端には、排気路３ｂの内部の温度を検出する排気温度センサ７が設けられている。 The combustion chamber 3a is provided with a spark plug 4 for igniting the burner 2 and a frame rod 5 for detecting the ignition of the burner 2. An exhaust pipe 6 made of, for example, vinyl chloride for exhausting the combustion exhaust gas to the outside is connected to the downstream end of the exhaust passage 3b. Further, at the downstream end of the exhaust passage 3b, an exhaust temperature sensor 7 for detecting the temperature inside the exhaust passage 3b is provided.

缶体３には、燃焼室３ａ内にバーナ２の燃焼用空気を供給する燃焼ファン８が設けられている。 The can body 3 is provided with a combustion fan 8 for supplying combustion air for the burner 2 in the combustion chamber 3a.

バーナ２には、燃料ガス供給管９を介して燃料ガスが供給される。燃料ガス供給管９には、その上流側から順に元ガス電磁弁１０及びガス比例弁１１が設けられている。燃料ガス供給管９は、バーナ用ガス電磁弁１２を介してバーナ２に接続されている。 Fuel gas is supplied to the burner 2 via the fuel gas supply pipe 9. The fuel gas supply pipe 9 is provided with a source gas solenoid valve 10 and a gas proportional valve 11 in this order from the upstream side thereof. The fuel gas supply pipe 9 is connected to the burner 2 via the burner gas solenoid valve 12.

缶体３の内部には、熱交換器１６が設けられている。暖房装置１は、循環路１９と、図示しない上水道に接続されて循環路１９へ水分を補水する補水電磁弁（図示せず）を備えている。熱交換器１６は循環路１９の一部に接続されている。熱交換器１６は、缶体３内の燃焼排ガスから熱を吸収して循環路１９を流通する水を加熱する。 A heat exchanger 16 is provided inside the can body 3. The heating device 1 includes a circulation path 19 and a water replenishment solenoid valve (not shown) connected to a water supply (not shown) to replenish water to the circulation path 19. The heat exchanger 16 is connected to a part of the circulation path 19. The heat exchanger 16 absorbs heat from the combustion exhaust gas in the can body 3 to heat the water flowing through the circulation path 19.

循環路１９は、熱交換器１６に流れ込んだ湯水を流通する。循環路１９には、室内に設置されるヒータ２１と、暖房ポンプ２２とが設けられている。暖房ポンプ２２は、後述するコントローラ３０により駆動が制御される。 The circulation path 19 circulates the hot water that has flowed into the heat exchanger 16. The circulation path 19 is provided with a heater 21 installed in the room and a heating pump 22. The drive of the heating pump 22 is controlled by a controller 30, which will be described later.

暖房ポンプ２２の駆動により、温水がヒータ２１を介して循環路１９を循環し、ヒータ２１からの放熱により室内の暖房が行われる。 By driving the heating pump 22, hot water circulates in the circulation path 19 via the heater 21, and the heat radiated from the heater 21 heats the room.

循環路１９の熱交換器１６よりも上流側には、熱交換器１６に流入する前の温水の温度を検出する流入水温度センサ２５が設けられている。また、循環路１９の熱交換器１６よりも下流側には、熱交換器１６から流出する温水の温度を検出する流出水温度センサ２６が設けられている。 An inflow water temperature sensor 25 for detecting the temperature of hot water before flowing into the heat exchanger 16 is provided on the upstream side of the heat exchanger 16 of the circulation path 19. Further, on the downstream side of the heat exchanger 16 of the circulation path 19, a runoff water temperature sensor 26 for detecting the temperature of the hot water flowing out from the heat exchanger 16 is provided.

暖房装置１は、コントローラ３０により統括的に作動が制御される。コントローラ３０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暖房装置１の制御用プログラムをＣＰＵで実行することによって暖房装置１の作動を制御する。 The operation of the heating device 1 is collectively controlled by the controller 30. The controller 30 is an electronic circuit unit composed of a CPU, a memory, and the like (not shown), and controls the operation of the heating device 1 by executing a control program of the heating device 1 held in the memory on the CPU.

コントローラ３０には、暖房装置１を遠隔操作するためのリモコン３３がリモコンケーブル３４を介して接続されている。リモコン３３には、表示部３５と図示しない操作スイッチ群（暖房温度を設定する温度設定スイッチ等）が設けられている。 A remote controller 33 for remotely controlling the heating device 1 is connected to the controller 30 via a remote controller 34. The remote controller 33 is provided with a display unit 35 and an operation switch group (a temperature setting switch for setting the heating temperature, etc.) (not shown).

コントローラ３０には、フレームロッド５、排気温度センサ７、流入水温度センサ２５、及び流出水温度センサ２６の検出信号が入力される。また、コントローラ３０から出力される制御信号によって、点火プラグ４、燃焼ファン８、元ガス電磁弁１０、ガス比例弁１１、バーナ用ガス電磁弁１２の作動が制御される。 The detection signals of the frame rod 5, the exhaust temperature sensor 7, the inflow water temperature sensor 25, and the outflow water temperature sensor 26 are input to the controller 30. Further, the operation of the spark plug 4, the combustion fan 8, the original gas solenoid valve 10, the gas proportional valve 11, and the burner gas solenoid valve 12 is controlled by the control signal output from the controller 30.

コントローラ３０は、暖房装置１に電源が投入されている状態で、使用者によりリモコン３３が操作されて暖房運転を開始する信号をリモコン３３から受信したときに、暖房運転を開始する。 The controller 30 starts the heating operation when the remote controller 33 is operated by the user and receives a signal from the remote controller 33 to start the heating operation while the heating device 1 is powered on.

コントローラ３０は、燃焼ファン８を回転させた状態で、元ガス電磁弁１０、及びバーナ用ガス電磁弁１２を開弁し、点火プラグ４を駆動してバーナ２に点火する。その後、コントローラ３０は、暖房ポンプ２２を作動し、流入水温度センサ２５及び流出水温度センサ２６からの信号に基づいて、ヒータ２１による暖房温度がリモコン３３で設定された温度になるように、ガス比例弁１１やバーナ用ガス電磁弁１２の作動を制御してバーナ２の燃焼量を調節する。 The controller 30 opens the original gas solenoid valve 10 and the burner gas solenoid valve 12 in a state where the combustion fan 8 is rotated, and drives the spark plug 4 to ignite the burner 2. After that, the controller 30 operates the heating pump 22, and the gas is set so that the heating temperature by the heater 21 becomes the temperature set by the remote control 33 based on the signals from the inflow water temperature sensor 25 and the outflow water temperature sensor 26. The operation of the proportional valve 11 and the burner gas solenoid valve 12 is controlled to adjust the combustion amount of the burner 2.

そして、コントローラ３０は、使用者によりリモコン３３が操作されて、暖房を停止する信号をリモコン３３から受信したときに、元ガス電磁弁１０及びバーナ用ガス電磁弁１２を閉弁してバーナ２を消火し、暖房ポンプ２２を停止し、暖房運転を終了する。 Then, when the remote controller 33 is operated by the user and a signal for stopping heating is received from the remote controller 33, the controller 30 closes the original gas solenoid valve 10 and the burner gas solenoid valve 12 to open the burner 2. The fire is extinguished, the heating pump 22 is stopped, and the heating operation is terminated.

［暖房運転中の排気温度センサ異常検知処理］
コントローラ３０は、排気温度センサ７での検出温度に基づいて、塩化ビニール製の排気管６に、排気管６の耐熱温度以上の燃焼ガスが排出されないように制御し、且つ、排気温度センサ７の異常の有無を検知する異常検知処理を行う。 [Exhaust temperature sensor abnormality detection processing during heating operation]
The controller 30 controls the exhaust pipe 6 made of vinyl chloride so that the combustion gas equal to or higher than the heat resistant temperature of the exhaust pipe 6 is not discharged based on the temperature detected by the exhaust temperature sensor 7, and the exhaust temperature sensor 7 Performs anomaly detection processing to detect the presence or absence of anomalies.

図２に示すように、リモコン３３を操作して暖房をオンする（ＳＴＥＰ１）。この暖房オンでは、コントローラ３０は、暖房ポンプ２２をオンし、バーナ２を燃焼させ、且つ、暖房設定温度に応じた加熱設定温度（例えば、８０°Ｃ）で温水を加熱するようにバーナ２の燃焼を制御する。 As shown in FIG. 2, the remote controller 33 is operated to turn on the heating (STEP 1). In this heating on, the controller 30 turns on the heating pump 22, burns the burner 2, and heats the hot water at the heating set temperature (for example, 80 ° C.) according to the heating set temperature. Control combustion.

コントローラ３０は、排気温度センサ７での検出温度Ｔ１が、排気管６の耐熱温度（例えば、７０°Ｃ）以上であるか否かを判定する（ＳＴＥＰ２）。 The controller 30 determines whether or not the temperature T1 detected by the exhaust temperature sensor 7 is equal to or higher than the heat resistant temperature (for example, 70 ° C) of the exhaust pipe 6 (STEP 2).

排気温度センサ７での検出温度Ｔ１が、排気管６の耐熱温度（７０°Ｃ）以上である場合（ＳＴＥＰ２で「ＹＥＳ」）、コントローラ３０は、エラー状態であることを検出し、暖房ポンプ２２をオフし、バーナ２の燃焼を停止するエラー停止処理を行う（ＳＴＥＰ３）。このエラー停止処理では、コントローラ３０は、排気管６に耐熱温度以上の燃焼排ガスが流れるおそれがあるため、バーナ２の燃焼を停止したことを示すコメントを表示部３５に表示することが好ましい。このバーナ燃焼停止処理により、排気管６に耐熱温度以上の燃焼排ガスが流れて破損するのを防止することができる。 When the temperature T1 detected by the exhaust temperature sensor 7 is equal to or higher than the heat resistant temperature (70 ° C) of the exhaust pipe 6 (“YES” in STEP 2), the controller 30 detects that it is in an error state, and the heating pump 22 detects it. Is turned off, and an error stop process for stopping the combustion of the burner 2 is performed (STEP 3). In this error stop processing, since the controller 30 may flow the combustion exhaust gas having a heat resistant temperature or higher through the exhaust pipe 6, it is preferable to display a comment indicating that the combustion of the burner 2 has been stopped on the display unit 35. By this burner combustion stop treatment, it is possible to prevent the combustion exhaust gas having a heat resistant temperature or higher from flowing to the exhaust pipe 6 and being damaged.

一方、排気温度センサ７での検出温度Ｔ１が、排気管６の耐熱温度（７０°Ｃ）以上ではない場合（ＳＴＥＰ２で「ＮＯ」）、コントローラ３０は、排気温度センサ７での検出温度Ｔ１が、流入水温度センサ２５での検出温度Ｔ２を超えているか否かを判定する（ＳＴＥＰ４）。 On the other hand, when the temperature T1 detected by the exhaust temperature sensor 7 is not equal to or higher than the heat resistant temperature (70 ° C) of the exhaust pipe 6 (“NO” in STEP 2), the controller 30 has a temperature T1 detected by the exhaust temperature sensor 7. , It is determined whether or not the temperature detected by the inflow water temperature sensor 25 exceeds T2 (STEP 4).

排気温度センサ７での検出温度Ｔ１が、流入水温度センサ２５での検出温度Ｔ２を超えていない場合（ＳＴＥＰ４で「ＮＯ」）、コントローラ３０は、排気温度センサ７の異常を検知し、バーナ２による燃焼量を所定量（例えば、１０％）下げる（ＳＴＥＰ５）。なお、排気温度センサ７での検出温度Ｔ１が、流入水温度センサ２５での検出温度Ｔ２を超えている場合（ＳＴＥＰ４で「ＹＥＳ」）、再びＳＴＥＰ２が行われる。 When the detection temperature T1 of the exhaust temperature sensor 7 does not exceed the detection temperature T2 of the inflow water temperature sensor 25 (“NO” in STEP 4), the controller 30 detects an abnormality of the exhaust temperature sensor 7 and burner 2 Reduces the amount of combustion by a predetermined amount (for example, 10%) (STEP 5). If the temperature T1 detected by the exhaust temperature sensor 7 exceeds the temperature T2 detected by the inflow water temperature sensor 25 (“YES” in STEP4), STEP2 is performed again.

バーナ２による燃焼量を１０％下げた（ＳＴＥＰ５）後、上記ＳＴＥＰ４で「ＮＯ」となった異常が、温度センサ７，２５に起因した恒久的なものであるか一時的なものであるかを判断するために、コントローラ３０は、排気温度センサ７での検出温度Ｔ１が、流入水温度センサ２５での検出温度Ｔ２を超え、且つ、排気温度センサ７での検出温度Ｔ１が７０°Ｃ未満であるか否かを判定する（ＳＴＥＰ６）。なお、ＳＴＥＰ６では、排気温度センサ７での検出温度Ｔ１が７０°Ｃ未満であるか否かのみを判定するようにしてもよい。 After reducing the amount of combustion by the burner 2 by 10% (STEP 5), whether the abnormality that became "NO" in STEP 4 is permanent or temporary due to the temperature sensors 7 and 25. In order to determine, in the controller 30, the detection temperature T1 by the exhaust temperature sensor 7 exceeds the detection temperature T2 by the inflow water temperature sensor 25, and the detection temperature T1 by the exhaust temperature sensor 7 is less than 70 ° C. It is determined whether or not there is (STEP 6). In STEP 6, it may be determined only whether or not the temperature T1 detected by the exhaust temperature sensor 7 is less than 70 ° C.

上記ＳＴＥＰ４で「ＮＯ」となった異常が一時的なものである場合、排気温度センサ７での検出温度Ｔ１が、流入水温度センサ２５での検出温度Ｔ２を超え、且つ、排気温度センサ７での検出温度Ｔ１が７０°Ｃ未満であると判定され（ＳＴＥＰ６で「ＹＥＳ」）、コントローラ３０は、暖房オフ操作が行われたこと（ＳＴＥＰ７で「ＹＥＳ」）に応じて、暖房を停止する（ＳＴＥＰ８）。なお、暖房オフ操作が行われていない場合（ＳＴＥＰ７で「ＮＯ」）、再び、ＳＴＥＰ６が行われる。すなわち、上記ＳＴＥＰ４で「ＮＯ」となった異常が一時的なものであり、排気温度センサ７での検出温度Ｔ１が、流入水温度センサ２５での検出温度Ｔ２を超え、且つ、排気温度センサ７での検出温度Ｔ１が７０°Ｃ未満であり（ＳＴＥＰ６で「ＹＥＳ」）、暖房オフ操作が行われていない場合（ＳＴＥＰ７で「ＮＯ」）、暖房が継続して行われる。 When the abnormality of "NO" in STEP 4 is temporary, the temperature T1 detected by the exhaust temperature sensor 7 exceeds the temperature T2 detected by the inflow water temperature sensor 25, and the exhaust temperature sensor 7 is used. It is determined that the detected temperature T1 is less than 70 ° C (“YES” in STEP 6), and the controller 30 stops heating in response to the heating off operation (“YES” in STEP 7). STEP8). If the heating off operation has not been performed (“NO” in STEP 7), STEP 6 is performed again. That is, the abnormality of "NO" in STEP 4 is temporary, the temperature T1 detected by the exhaust temperature sensor 7 exceeds the temperature T2 detected by the inflow water temperature sensor 25, and the exhaust temperature sensor 7 If the detected temperature T1 in is less than 70 ° C (“YES” in STEP 6) and the heating off operation is not performed (“NO” in STEP 7), heating is continuously performed.

一方、上記ＳＴＥＰ４で「ＮＯ」となった異常が、温度センサ７，２５に起因した恒久的なものである場合、排気温度センサ７での検出温度Ｔ１が、流入水温度センサ２５での検出温度Ｔ２を超えていない（例えば、Ｔ１が４０°Ｃ、Ｔ２が５５°Ｃ）、又は、排気温度センサ７での検出温度Ｔ１が、７０°Ｃ未満ではないと判定され（ＳＴＥＰ６で「ＮＯ」）、コントローラ３０は、エラー停止処理を行う（ＳＴＥＰ３）。なお、ＳＴＥＰ５〜ＳＴＥＰ８を削除し、ＳＴＥＰ４で「ＮＯ」の場合にＳＴＥＰ３（エラー停止）を行うようにしてもよい。また、ＳＴＥＰ２を削除してもよい。 On the other hand, when the abnormality of "NO" in STEP 4 is a permanent one caused by the temperature sensors 7 and 25, the temperature T1 detected by the exhaust temperature sensor 7 is the temperature detected by the inflow water temperature sensor 25. It is determined that the temperature does not exceed T2 (for example, T1 is 40 ° C and T2 is 55 ° C), or the temperature detected by the exhaust temperature sensor 7 is not less than 70 ° C (“NO” in STEP 6). , The controller 30 performs an error stop process (STEP 3). Note that STEP5 to STEP8 may be deleted, and STEP3 (error stop) may be performed when STEP4 is "NO". Moreover, STEP2 may be deleted.

本実施形態では、排気温度センサ７が正常に作動し、且つ、排気温度センサ７での検出温度Ｔ１が、排気管６の耐熱温度（７０°Ｃ）以上ではない場合（ＳＴＥＰ２で「ＮＯ」）、排気温度センサ７での検出温度Ｔ１は６５°Ｃ程度、流入水温度センサ２５での検出温度Ｔ２は６０°Ｃ程度となる。したがって、排気温度センサ７での検出温度Ｔ１が、流入水温度センサ２５での検出温度Ｔ２を超えていると判定され（ＳＴＥＰ４で「ＹＥＳ」）、再びＳＴＥＰ２が行われ、以降は、ＳＴＥＰ２及びＳＴＥＰ４が繰り返し行われ、暖房が継続して行われる。 In the present embodiment, when the exhaust temperature sensor 7 operates normally and the temperature T1 detected by the exhaust temperature sensor 7 is not equal to or higher than the heat resistant temperature (70 ° C) of the exhaust pipe 6 (“NO” in STEP 2). The detection temperature T1 of the exhaust temperature sensor 7 is about 65 ° C, and the detection temperature T2 of the inflow water temperature sensor 25 is about 60 ° C. Therefore, it is determined that the temperature T1 detected by the exhaust temperature sensor 7 exceeds the temperature T2 detected by the inflow water temperature sensor 25 (“YES” in STEP4), STEP2 is performed again, and thereafter, STEP2 and STEP4 Is repeated, and heating is continued.

また、排気温度センサ７での検出温度Ｔ１が、流入水温度センサ２５での検出温度Ｔ２を超えていない場合（ＳＴＥＰ４で「ＮＯ」）でも、排気温度センサ７又は流入水温度センサ２５の異常に起因した恒久的な異常検知であるか、他の要因に起因した一時的な異常検知であるかは、直ぐには判断することができない。このため、ＳＴＥＰ４で「ＮＯ」となった場合には、コントローラ３０は、バーナ２による燃焼量を１０％下げる（ＳＴＥＰ５）。 Further, even when the detection temperature T1 of the exhaust temperature sensor 7 does not exceed the detection temperature T2 of the inflow water temperature sensor 25 (“NO” in STEP 4), the exhaust temperature sensor 7 or the inflow water temperature sensor 25 is abnormal. Whether it is a permanent abnormality detection caused by the cause or a temporary abnormality detection caused by another factor cannot be immediately determined. Therefore, when the result is "NO" in STEP 4, the controller 30 reduces the amount of combustion by the burner 2 by 10% (STEP 5).

本実施形態では、排気温度センサ７での検出温度Ｔ１が、流入水温度センサ２５での検出温度Ｔ２を超えていない状態（ＳＴＥＰ４で「ＮＯ」）が一時的な異常検知であり、排気温度センサ７が正常に作動している場合、バーナ２による燃焼量を１０％下げる（ＳＴＥＰ５）と、排気温度センサ７での検出温度Ｔ１は６０°Ｃ程度、流入水温度センサ２５での検出温度Ｔ２は５５°Ｃ程度となる。したがって、排気温度センサ７での検出温度Ｔ１が、流入水温度センサ２５での検出温度Ｔ２を超え、且つ、排気温度センサ７での検出温度Ｔ１が７０°Ｃ未満であると判定され（ＳＴＥＰ６で「ＹＥＳ」）、暖房オフ操作が行われていない場合（ＳＴＥＰ７で「ＮＯ」）、暖房が継続して行われる。 In the present embodiment, a state in which the detection temperature T1 of the exhaust temperature sensor 7 does not exceed the detection temperature T2 of the inflow water temperature sensor 25 (“NO” in STEP 4) is a temporary abnormality detection, and the exhaust temperature sensor When 7 is operating normally, when the amount of combustion by the burner 2 is reduced by 10% (STEP 5), the detection temperature T1 by the exhaust temperature sensor 7 is about 60 ° C, and the detection temperature T2 by the inflow water temperature sensor 25 is about 60 ° C. It will be about 55 ° C. Therefore, it is determined that the detection temperature T1 by the exhaust temperature sensor 7 exceeds the detection temperature T2 by the inflow water temperature sensor 25, and the detection temperature T1 by the exhaust temperature sensor 7 is less than 70 ° C (in STEP 6). If the heating off operation is not performed (“NO” in STEP 7), the heating is continuously performed.

これに対して、排気温度センサ７が正常に作動していない場合（中間故障）、バーナ２による燃焼量を１０％下げる制御（ＳＴＥＰ５）を行っても、排気温度センサ７での検出温度Ｔ１は４０°Ｃ程度（所定の中間値）、流入水温度センサ２５での検出温度Ｔ２は５５°Ｃ程度となる。このため、排気温度センサ７での検出温度Ｔ１が、流入水温度センサ２５での検出温度Ｔ２を超えていないと判定され（ＳＴＥＰ６で「ＮＯ」）、コントローラ３０は、エラー停止処理を行う（ＳＴＥＰ３）。 On the other hand, when the exhaust temperature sensor 7 is not operating normally (intermediate failure), the temperature T1 detected by the exhaust temperature sensor 7 is still high even if the burner 2 controls to reduce the combustion amount by 10% (STEP5). The temperature detected by the inflow water temperature sensor 25 is about 40 ° C (a predetermined intermediate value), and the temperature T2 is about 55 ° C. Therefore, it is determined that the detection temperature T1 of the exhaust temperature sensor 7 does not exceed the detection temperature T2 of the inflow water temperature sensor 25 (“NO” in STEP 6), and the controller 30 performs an error stop process (STEP 3). ).

このように、排気温度センサ７での検出温度Ｔ１が、流入水温度センサ２５での検出温度Ｔ２を超えていないと判定された場合には、排気温度センサ７が正常に作動していないこと（中間故障）を検知するので、容易に排気温度センサ７の異常（中間故障）を検知することができる。 In this way, when it is determined that the detection temperature T1 by the exhaust temperature sensor 7 does not exceed the detection temperature T2 by the inflow water temperature sensor 25, the exhaust temperature sensor 7 is not operating normally ( Since the intermediate failure) is detected, the abnormality (intermediate failure) of the exhaust temperature sensor 7 can be easily detected.

なお、流入水温度センサ２５での検出温度Ｔ２以外の検出温度、例えば、燃焼室３ａ内に供給する燃焼用空気の温度（給気温度）を検出し、排気温度センサ７での検出温度Ｔ１が、検出給気温度（例えば、２５°Ｃ）を超えていないと判定された場合に、排気温度センサ７の異常（中間故障）を検知することも考えられる。しかし、排気温度センサ７が正常に作動している場合、排気温度センサ７での検出温度Ｔ１は６５°Ｃ程度であり、検出給気温度（２５°Ｃ）との差は大きい（４０°Ｃ程度）。このため、排気温度センサ７に異常（中間故障）が発生した場合でも、排気温度センサ７での検出温度Ｔ１が、検出給気温度（２５°Ｃ）以下になるまでに時間がかかり、排気温度センサ７の異常を早期に検知することはできない。 It should be noted that the detection temperature other than the detection temperature T2 by the inflow water temperature sensor 25, for example, the temperature of the combustion air supplied into the combustion chamber 3a (supply air temperature) is detected, and the detection temperature T1 by the exhaust temperature sensor 7 is set. It is also conceivable to detect an abnormality (intermediate failure) of the exhaust temperature sensor 7 when it is determined that the detected supply air temperature (for example, 25 ° C.) is not exceeded. However, when the exhaust temperature sensor 7 is operating normally, the detected temperature T1 by the exhaust temperature sensor 7 is about 65 ° C, and the difference from the detected supply air temperature (25 ° C) is large (40 ° C). degree). Therefore, even if an abnormality (intermediate failure) occurs in the exhaust temperature sensor 7, it takes time for the detection temperature T1 of the exhaust temperature sensor 7 to fall below the detected supply air temperature (25 ° C), and the exhaust temperature. The abnormality of the sensor 7 cannot be detected at an early stage.

これに対して、本実施形態では、排気温度センサ７が正常に作動している場合、排気温度センサ７での検出温度Ｔ１は６５°Ｃ程度、流入水温度センサ２５での検出温度Ｔ２は６０°Ｃ程度であり、その差は小さい（５°Ｃ程度）。これにより、排気温度センサ７に異常（中間故障）が発生した場合に、排気温度センサ７での検出温度Ｔ１が、流入水温度センサ２５での検出温度Ｔ２（６０°Ｃ）以下となるまでの時間が、給気温度を用いて検知するものに比べて短くなり、異常を早期に検知することができる。 On the other hand, in the present embodiment, when the exhaust temperature sensor 7 is operating normally, the detection temperature T1 by the exhaust temperature sensor 7 is about 65 ° C, and the detection temperature T2 by the inflow water temperature sensor 25 is 60. It is about ° C, and the difference is small (about 5 ° C). As a result, when an abnormality (intermediate failure) occurs in the exhaust temperature sensor 7, the temperature T1 detected by the exhaust temperature sensor 7 becomes equal to or less than the temperature T2 (60 ° C) detected by the inflow water temperature sensor 25. The time is shorter than that detected using the supply air temperature, and the abnormality can be detected at an early stage.

なお、上記実施形態では、ＳＴＥＰ５でバーナ２による燃焼量を１０％下げ、ＳＴＥＰ６で一時的な異常であるかを確認し、ＳＴＥＰ６で「ＮＯ」と判定（恒久的な異常である判定）された場合、エラー停止処理（ＳＴＥＰ３）を行っているが、バーナ２による燃焼量を複数回下げ、一時的な異常であるかの確認を複数回行うようにしてもよい。この場合、ＳＴＥＰ６で「ＮＯ」と判定された後に、その判定が所定回数（例えば、３回）に達したか否かを判定し、３回に達していない（１回目や２回目）場合には、再度ＳＴＥＰ５を行う。そして、３回に達した場合には、エラー停止処理（ＳＴＥＰ３）を行う。また、燃焼量を下げる割合は１０％に限らず、燃焼量を下げるようにすればよく、例えば、燃焼量が大、中、小の３段階に設定され、燃焼量が大又は中の場合には、燃焼量を小に変更するようにしてもよい。 In the above embodiment, the amount of combustion by the burner 2 is reduced by 10% in STEP5, it is confirmed in STEP6 whether it is a temporary abnormality, and it is determined as "NO" in STEP6 (determination that it is a permanent abnormality). In this case, although the error stop processing (STEP3) is performed, the amount of combustion by the burner 2 may be reduced a plurality of times to confirm whether or not the abnormality is temporary. In this case, after the determination in STEP 6 is "NO", it is determined whether or not the determination has reached a predetermined number of times (for example, 3 times), and if the determination has not reached 3 times (1st or 2nd time). Performs STEP 5 again. Then, when the number reaches three times, an error stop process (STEP3) is performed. Further, the rate of reducing the combustion amount is not limited to 10%, and the combustion amount may be reduced. For example, when the combustion amount is set to three stages of large, medium, and small, and the combustion amount is large or medium. May change the amount of combustion to a small amount.

上記実施形態では、１個のバーナ２と、熱交換器１６とを備える暖房装置１に本発明を実施しているが、２個のバーナと２個の熱交換器とを備え、それぞれを個別に制御する暖房装置にも本発明は実施可能である。また、複数の暖房端末に温水を流通させる暖房装置にも本発明は実施可能である。 In the above embodiment, the present invention is implemented in a heating device 1 including one burner 2 and a heat exchanger 16, but two burners and two heat exchangers are provided, and each of them is individually provided. The present invention can also be applied to a heating device controlled by the above. The present invention can also be applied to a heating device that distributes hot water to a plurality of heating terminals.

１…暖房装置、２…バーナ、３…缶体、３ａ…燃焼室、３ｂ…排気路、６…排気管、７…排気温度センサ、１６…熱交換器、１９…循環路、２５…流入水温度センサ、３０…コントローラ 1 ... Heating device, 2 ... Burner, 3 ... Can body, 3a ... Combustion chamber, 3b ... Exhaust path, 6 ... Exhaust pipe, 7 ... Exhaust temperature sensor, 16 ... Heat exchanger, 19 ... Circulation path, 25 ... Inflow water Temperature sensor, 30 ... controller

Claims (3)

熱媒が流通する循環路と、
前記循環路の途中に設けられた暖房端末と、
前記循環路の途中の前記暖房端末よりも上流側に設けられた熱交換器と、
前記熱交換器を加熱するバーナと、
前記バーナの燃焼排ガスを外部に排出する排気管と、
前記バーナを燃焼させることにより、前記熱交換器で加熱された熱媒を前記暖房端末に流通させる暖房運転を実行する暖房制御手段と、
前記熱交換器に流入する熱媒の温度を検出する流入水温度検出手段と、
前記排気管の下流側の内部の温度を検出する排気温度検出手段と、
前記暖房運転実行中に、前記排気温度検出手段での検出温度が、前記流入水温度検出手段での検出温度以下となった場合に、前記排気温度検出手段の異常を検知する異常検知手段と、
前記バーナを内蔵する缶体と、
を備え、
前記循環路は、前記熱交換器を通過して前記缶体から出た後に、前記暖房端末よりも上流側で再び前記缶体を通過することを特徴とする暖房装置。 The circulation path through which the heat medium circulates,
A heating terminal provided in the middle of the circulation path and
A heat exchanger provided on the upstream side of the heating terminal in the middle of the circulation path, and
A burner that heats the heat exchanger and
An exhaust pipe that discharges the combustion exhaust gas of the burner to the outside,
A heating control means for executing a heating operation in which a heat medium heated by the heat exchanger is distributed to the heating terminal by burning the burner.
Inflow water temperature detecting means for detecting the temperature of the heat medium flowing into the heat exchanger, and
Exhaust temperature detecting means for detecting the temperature inside the downstream side of the exhaust pipe, and
When the temperature detected by the exhaust temperature detecting means becomes equal to or lower than the temperature detected by the inflow water temperature detecting means during the heating operation, the abnormality detecting means for detecting the abnormality of the exhaust temperature detecting means and the abnormality detecting means.
The can body containing the burner and
Equipped with a,
The heating device is characterized in that the circulation path passes through the heat exchanger, exits from the can body, and then passes through the can body again on the upstream side of the heating terminal. 請求項１に記載の暖房装置において、
前記排気温度検出手段での検出温度が所定温度以上である場合、又は前記異常検知手段が前記排気温度検出手段の異常を検知した場合に、前記バーナの燃焼を停止する燃焼停止手段を備えることを特徴とする暖房装置。 In the heating device according to claim 1,
When the detection temperature by the exhaust temperature detecting means is equal to or higher than a predetermined temperature, or when the abnormality detecting means detects an abnormality of the exhaust temperature detecting means, the combustion stopping means for stopping the combustion of the burner is provided. A characteristic heating device. 請求項１に記載の暖房装置において、
前記異常検知手段が前記排気温度検出手段の異常を検知した場合に、前記バーナの燃焼量を所定量低下させる燃焼量制御手段を備えることを特徴とする暖房装置。 In the heating device according to claim 1,
A heating device including a combustion amount control means for reducing the combustion amount of the burner by a predetermined amount when the abnormality detecting means detects an abnormality of the exhaust temperature detecting means.
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