JP6684444B2 - 1 can 2 water type water heater - Google Patents
1 can 2 water type water heater Download PDFInfo
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- JP6684444B2 JP6684444B2 JP2016103938A JP2016103938A JP6684444B2 JP 6684444 B2 JP6684444 B2 JP 6684444B2 JP 2016103938 A JP2016103938 A JP 2016103938A JP 2016103938 A JP2016103938 A JP 2016103938A JP 6684444 B2 JP6684444 B2 JP 6684444B2
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Description
本発明は、給湯加熱と風呂の追い焚き加熱を共通の燃焼部にて行う１缶２水型給湯装置に関し、特に追い焚き通路に備えられた風呂戻り温度を検知する風呂温度検知手段の異常発生を検出することが可能な１缶２水型給湯装置に関する。 The present invention relates to a one-can-two-water hot water supply device that performs hot water heating and bath reheating heating in a common combustion unit, and in particular, an abnormality occurs in a bath temperature detection means provided in a reheating passage for detecting a bath return temperature. The present invention relates to a 1-can / 2-water hot water supply device capable of detecting water.
従来から、注湯温度センサにより注湯温度を検知しながら湯張り運転を行い、風呂温度センサにより風呂戻り温度を検知しながら追い焚き運転を行う給湯装置が広く使用されている。このような給湯装置は、注湯温度センサや風呂温度センサが検知した温度に基づいて風呂設定温度になるように熱源機で湯水を加熱するので、注湯温度センサや風呂温度センサに異常が発生すると浴槽の湯水を風呂設定温度に調節することができない。例えば、風呂戻り温度が実際の温度より低く検知される風呂温度センサの異常が生じた場合には、浴槽の湯水が過剰に追い焚き加熱されるため、浴槽の湯水が風呂設定温度より高温になってユーザに火傷等の危険が生じる虞がある。 2. Description of the Related Art Conventionally, there has been widely used a hot water supply device that performs a filling operation while detecting a pouring temperature by a pouring temperature sensor and performs a reheating operation while detecting a bath return temperature by a bath temperature sensor. In such a water heater, hot water is heated by the heat source device so that the bath temperature reaches the set bath temperature based on the temperature detected by the pouring temperature sensor or the bath temperature sensor, so an abnormality occurs in the pouring temperature sensor or the bath temperature sensor. Then, the water in the bathtub cannot be adjusted to the bath temperature setting. For example, if there is an abnormality in the bath temperature sensor that detects the bath return temperature lower than the actual temperature, the hot and cold water in the bathtub will be overheated and heated, causing the hot and cold water in the bathtub to become hotter than the set bath temperature. As a result, there is a risk that the user may be at risk of burns or the like.
このような温度センサの異常発生の問題に対して、例えば特許文献１の給湯装置のように、湯張り運転の際に、追い焚き通路の風呂往き通路と風呂戻り通路の両方から浴槽に注湯する両搬送を行い、風呂往き通路に備えられた注湯温度センサの検知温度と風呂戻り通路に設けられた風呂温度センサの検知温度とを比較することにより、これらの温度センサの異常発生を検出する給湯装置がある。 For such a problem of abnormal occurrence of the temperature sensor, for example, as in the hot water supply device of Patent Document 1, during the filling operation, pouring water into the bathtub from both the bathing passage and the bathing return passage of the reheating passage. The temperature of the pouring temperature sensor provided in the bath passage is compared with the temperature of the bath temperature sensor provided in the bath return passage to detect the occurrence of an abnormality in these temperature sensors. There is a hot-water supply system that does.
注湯温度センサと風呂温度センサが注湯される湯水の温度を検知するので、温度センサに異常がなければこれらの検知温度は略一致し、検知温度が所定温度以上異なる場合は温度センサに異常が発生していると判定される。通常、湯張り運転は追い焚き運転より前に行われるので、温度センサに異常が発生している場合にはその後の追い焚き運転を制限することができる。 The pouring temperature sensor and bath temperature sensor detect the temperature of the pouring water, so if there is no abnormality in the temperature sensor, these detected temperatures are approximately the same, and if the detected temperatures differ by more than the specified temperature, the temperature sensor has an abnormality. Is determined to have occurred. Usually, the hot water filling operation is performed before the reheating operation, so that when the temperature sensor is abnormal, the reheating operation after that can be restricted.
上述のように特許文献１の給湯装置は、浴槽の湯張り運転の際に注湯される同じ温度の湯水が風呂往き通路と風呂戻り通路を通ることを利用して温度センサの異常を検知している。しかし、低温の残り湯の追い焚き運転を行って風呂設定温度まで加熱する場合には、湯張り運転時の温度センサの異常検出が行われず、風呂戻り通路には熱源機による加熱前の湯水が流れ、風呂往き通路には熱源機による加熱後の湯水が流れるため、流れる湯水の温度が異なるので特許文献１の給湯装置では風呂温度センサの異常を検出することができない。 As described above, the hot water supply device of Patent Document 1 detects an abnormality in the temperature sensor by utilizing the fact that hot water poured at the same temperature during the filling operation of the bathtub passes through the bath passage and the bath return passage. ing. However, when the low-temperature remaining hot water is reheated to heat the bath to the set temperature, the temperature sensor does not detect an abnormality during the water filling operation, and hot water before heating by the heat source device is placed in the bath return passage. Since the hot water after heating by the heat source device flows in the flow and bath passages, the temperature of the hot water flowing differs, and therefore the hot water supply device of Patent Document 1 cannot detect an abnormality in the bath temperature sensor.
本発明の目的は、湯張り運転時以外に風呂温度センサの異常を検出可能な１缶２水型給湯装置を提供することである。 An object of the present invention is to provide a one-can-two-water hot water supply device capable of detecting an abnormality of a bath temperature sensor other than during a hot water filling operation.
請求項１の発明の１缶２水型給湯装置は、給湯加熱と、風呂の追い焚き加熱を共通の燃焼部にて行う１缶２水型給湯装置において、給湯加熱部の温度を検知する給湯温度検知手段と、風呂戻り温度を検知する浴槽温度検知手段と、風呂を追い焚き加熱する追い焚き単独運転時に給湯加熱部の温度が予め定められた基準温度に最初に到達したときの風呂戻り温度を記憶する記憶手段とを備え、前記追い焚き単独運転時に前記給湯加熱部の温度が前記基準温度に最初に到達したときの風呂戻り温度と、前回以前の追い焚き単独運転時に前記記憶手段に記憶された風呂戻り温度とを比較して、温度差が所定値以上になった場合には前記浴槽温度検知手段に異常が生じていると判定することを特徴としている。 The one-can, two-water hot water supply device according to the invention of claim 1 is a one-can, two-water hot water supply device that performs hot water heating and bath reheating heating in a common combustion unit. Temperature detecting means, bath temperature detecting means for detecting the bath return temperature, and bath returning temperature for heating the bath to reheat it when the temperature of the hot water supply heating part first reaches a predetermined reference temperature during independent operation And a bath return temperature when the temperature of the hot water heating section first reaches the reference temperature during the reheating single operation, and the storage means stores the previous reheating single operation before the previous operation. The bath return temperature is compared, and when the temperature difference exceeds a predetermined value, it is determined that the bath temperature detecting means is abnormal.
請求項２の発明の１缶２水型給湯装置は、請求項１において、前記記憶手段は、給湯加熱部の温度が予め定められた基準温度に最初に到達したときの風呂戻り温度に代えて、給湯加熱部に所定の温度上昇が生じたときの風呂戻り温度を記憶することを特徴としている。 The one-can-two-water hot water supply device according to the invention of claim 2 is the one according to claim 1, wherein the storage means replaces the bath return temperature when the temperature of the hot water heating portion first reaches a predetermined reference temperature. The bath return temperature when a predetermined temperature rise occurs in the hot water supply heating unit is stored.
請求項３の発明の１缶２水型給湯装置は、請求項１または２において、前記１缶２水型給湯装置の内部雰囲気温度を検知する雰囲気温度検知手段を備え、加熱運転停止から予め定められた待機時間が経過した場合に前記風呂戻り温度と前記雰囲気温度とを比較し、前記風呂戻り温度が前記雰囲気温度以下である場合には、前記風呂温度検知手段に異常が生じていると判定することを特徴としている。 According to a third aspect of the present invention, the one-can-two-water hot water supply device according to the first or second aspect is provided with an atmospheric temperature detecting means for detecting an internal atmospheric temperature of the one-can-two water hot water supply device, and the heating operation is stopped in advance. The bath return temperature and the ambient temperature are compared when a predetermined waiting time has elapsed, and when the bath return temperature is equal to or lower than the ambient temperature, it is determined that the bath temperature detection unit has an abnormality. It is characterized by doing.
本発明の１缶２水型給湯装置によれば、湯張り運転時以外に風呂温度検知手段の異常を検出することができる。 According to the one-can-two-water hot water supply device of the present invention, it is possible to detect an abnormality in the bath temperature detecting means other than during the filling operation.
以下、本発明を実施するための形態について実施例に基づいて説明する。 Hereinafter, modes for carrying out the present invention will be described based on Examples.
最初に１缶２水型給湯装置１について説明する。
図１に示すように、１缶２水型給湯装置１は、外装ケース２の内部に熱源機３と、制御ユニット４と、熱源機３に上水を供給する給水通路５と、熱源機３で加熱された湯水を出湯する出湯通路６と、浴槽７の湯水を加熱するための風呂追い焚き通路８と、外装ケース２の内部の雰囲気温度を検知する雰囲気温度センサ９（雰囲気温度検知手段に相当する）等を備え、給湯加熱と風呂の追い焚き加熱を共通の燃焼部１０により行う給湯装置である。
First, the 1-can / 2-water hot water supply device 1 will be described.
As shown in FIG. 1, the one-can-two-water hot water supply device 1 includes a heat source device 3, a control unit 4, a water supply passage 5 for supplying clean water to the heat source device 3, and a heat source device 3 inside the outer case 2. Hot water discharge passage 6 for discharging hot and cold water heated by, a bath reheating passage 8 for heating hot water in the bath tub 7, and an ambient temperature sensor 9 for detecting the ambient temperature inside the outer case 2 (in the ambient temperature detecting means, (Corresponding) and the like, and is a hot water supply device that performs hot water heating and bath reheating by a common combustion unit 10.
次に、熱源機３及び給水通路５について説明する。
熱源機３は、燃焼部１０と、給湯１次熱交換器１１（給湯加熱部に相当する）と、風呂熱交換器１２と、給湯２次熱交換器１３と、送風ファン１４と、燃焼ガス通路１５と、燃料通路１６等を備えている。燃料通路１６は液体または気体の公知の燃料を燃焼部１０に供給する。送風ファン１４は、燃焼部１０に外部から取り込んだ燃焼用の空気を供給すると共に、燃焼ガスが給湯１次熱交換器１１等を通過しながら排気口１７に向かって燃焼ガス通路１５を流れるように空気を供給する。尚、図１の熱源機３は燃焼部１０が給湯１次熱交換器１１等の上方に下向きに設けられた下向き燃焼式のものであるが、燃焼部１０が給湯１次熱交換機１１等の下方に上向きに設けられた上向き燃焼式のものであってもよい。
Next, the heat source device 3 and the water supply passage 5 will be described.
The heat source unit 3 includes a combustion unit 10, a hot water supply primary heat exchanger 11 (corresponding to a hot water supply heating unit), a bath heat exchanger 12, a hot water supply secondary heat exchanger 13, a blower fan 14, and a combustion gas. A passage 15 and a fuel passage 16 are provided. The fuel passage 16 supplies a known liquid or gas fuel to the combustion section 10. The blower fan 14 supplies the combustion air taken in from the outside to the combustion unit 10 and causes the combustion gas to flow through the combustion gas passage 15 toward the exhaust port 17 while passing through the hot water supply primary heat exchanger 11 and the like. Supply air to. The heat source unit 3 of FIG. 1 is of a downward combustion type in which the combustion unit 10 is provided downward above the hot water supply primary heat exchanger 11 and the like. It may be an upward combustion type which is provided downward and upward.
熱源機３に上水を供給する給水通路５は給湯２次熱交換器１３に接続され、給湯２次熱交換器１３と給湯１次熱交換器１１とが中間通路１８により接続され、給湯栓１９は出湯通路６により給湯１次熱交換器１１に接続されている。給水通路５は分配弁２０を有し、分配弁２０の下流側に給水量センサ２１を備えている。また、給水バイパス通路２２は、給水通路５から出湯通路６に接続されている。中間通路１８の下流端部分には、給湯１次熱交換器１１の温度を検知する沸騰防止温度センサ２３（給湯温度検知手段に相当する）が設けられている。尚、給水通路５は、フィルタや水抜き栓等を備えていてもよい。 The water supply passage 5 for supplying clean water to the heat source device 3 is connected to the hot water supply secondary heat exchanger 13, the hot water supply secondary heat exchanger 13 and the hot water supply primary heat exchanger 11 are connected by the intermediate passage 18, and a hot water tap 19 is connected to the hot water supply primary heat exchanger 11 through the hot water discharge passage 6. The water supply passage 5 has a distribution valve 20, and a water supply amount sensor 21 is provided downstream of the distribution valve 20. Further, the water supply bypass passage 22 is connected from the water supply passage 5 to the hot water outlet passage 6. A boiling prevention temperature sensor 23 (corresponding to hot water supply temperature detecting means) for detecting the temperature of the hot water supply primary heat exchanger 11 is provided at a downstream end portion of the intermediate passage 18. The water supply passage 5 may be provided with a filter, a water drain plug, or the like.
次に出湯通路６について説明する。
出湯通路６には、給水バイパス通路２２との接続部より下流側に出湯量を調節する水量サーボ２４が設けられ、水量サーボ２４において出湯通路６から分岐した注湯通路２５は、風呂追い焚き通路８の風呂戻り通路２７に接続されている。水量サーボ２４の上流側には給湯温度を検知する給湯出湯温度センサ２６が設けられ、注湯通路２５には注湯電磁弁２９や逆止弁３０等が設けられている。尚、出湯通路６は、水抜き栓等を備えていてもよい。
Next, the hot water passage 6 will be described.
The hot water passage 6 is provided with a water amount servo 24 for adjusting the amount of hot water discharged downstream of the connection with the water supply bypass passage 22, and the pouring passage 25 branched from the hot water passage 6 in the water amount servo 24 is a bath reheating passage. 8 is connected to the bath return passage 27. A hot water supply / outflow temperature sensor 26 for detecting a hot water supply temperature is provided upstream of the water amount servo 24, and a pouring electromagnetic valve 29, a check valve 30 and the like are provided in the pouring passage 25. The tap water passage 6 may be provided with a drain plug or the like.
次に風呂追い焚き通路８について説明する。
風呂追い焚き通路８は、浴槽７の湯水が風呂熱交換器１２へ向かって流れる風呂戻り通路２７と、風呂熱交換器１２で加熱された湯水が浴槽７へ向かって流れる風呂往き通路２８を有し、風呂ポンプ３１と風呂水流スイッチ３２（水流ＳＷ３２）と風呂温度センサ３３（浴槽温度検知手段に相当する）が風呂戻り通路２７に設けられ、風呂ポンプ３１を作動させることにより浴槽７の湯水を浴槽７と風呂熱交換器１２の間で循環させる。尚、風呂追い焚き通路８は、水抜き栓等を備えていてもよい。
Next, the bath reheating passage 8 will be described.
The bath reheating passage 8 has a bath return passage 27 through which hot and cold water in the bathtub 7 flows toward the bath heat exchanger 12, and a bath outgoing passage 28 through which hot and cold water heated by the bath heat exchanger 12 flows toward the bathtub 7. A bath pump 31, a bath water flow switch 32 (water flow SW32), and a bath temperature sensor 33 (corresponding to a bath temperature detecting means) are provided in the bath return passage 27, and the bath pump 31 is operated to remove hot water from the bath 7. It is circulated between the bath tub 7 and the bath heat exchanger 12. The bath reheating passage 8 may be provided with a water drain plug or the like.
次に制御ユニット４について説明する。
制御ユニット４は、制御プログラムや各種の設定値等を記憶可能な記憶手段３５を備え、記憶された設定値や温度センサ等の検知信号に基づいて１缶２水型給湯装置１に備えられたバルブやポンプ等を駆動させて給湯運転や風呂の追い焚き運転等を制御する。給湯設定温度等の設定値は、操作ボタンや表示部等を備えたリモコン３６をユーザ等が操作することにより、制御ユニット４に送信される。また、リモコン３６の表示部には運転状況等が表示され、異常発生等を報知することができる。尚、記憶手段３５としては、停電等においても記憶を保持できる公知の不揮発性の記憶素子が好ましい。
Next, the control unit 4 will be described.
The control unit 4 includes a storage unit 35 capable of storing a control program, various set values, etc., and is provided in the one-can-two-water hot water supply device 1 based on the stored set values, detection signals from the temperature sensor, and the like. It drives valves and pumps to control hot water supply operation and bath reheating operation. The set values such as the hot water supply set temperature are transmitted to the control unit 4 when the user or the like operates the remote controller 36 including the operation buttons and the display unit. In addition, the operating condition and the like are displayed on the display unit of the remote controller 36, and it is possible to notify the occurrence of an abnormality or the like. The storage unit 35 is preferably a known non-volatile storage element that can retain storage even in the event of a power failure.
次に、給湯運転について説明する。
給湯栓１９が開けられて給湯運転が開始されると、制御ユニット４は送風ファン１４を作動させ、燃焼部１０に燃料を供給し、点火装置により点火して燃焼部１０の燃焼を開始させる。給湯１次熱交換器１１は燃焼ガスの顕熱を回収して上水を加熱し、給湯２次熱交換器１３は燃焼ガスの潜熱を回収して上水を加熱する。こうして熱源機３で加熱され出湯通路６を流れる湯水は、制御ユニット４が分配弁２０の分配率や水量サーボ２４を調節することにより、給水バイパス通路２２から供給される上水と混合されて給湯設定温度に調節されて給湯栓１９に供給される。尚、湯張り運転は、給湯運転と同様に風呂設定温度に調整された湯水を注湯電磁弁２９を開けて注湯通路２５から浴槽7へ設定水量注湯するものである。
Next, the hot water supply operation will be described.
When the hot water supply plug 19 is opened and the hot water supply operation is started, the control unit 4 operates the blower fan 14, supplies fuel to the combustion unit 10, and ignites the ignition device to start combustion in the combustion unit 10. The hot water supply primary heat exchanger 11 recovers the sensible heat of the combustion gas to heat the tap water, and the hot water supply secondary heat exchanger 13 recovers the latent heat of the combustion gas to heat the tap water. The hot and cold water heated by the heat source device 3 and flowing through the hot water supply passage 6 is mixed with the clean water supplied from the water supply bypass passage 22 by the control unit 4 adjusting the distribution ratio of the distribution valve 20 and the water amount servo 24. The temperature is adjusted to the set temperature and supplied to the hot water tap 19. In the hot water filling operation, as in the hot water supply operation, hot water adjusted to the bath set temperature is opened by opening the solenoid valve 29 for pouring water from the pouring passage 25 to the bath 7.
このとき、燃焼ガスに含まれる水蒸気は給湯２次熱交換器１３で凝縮して酸性のドレン水となり、このドレン水は中和器３７により中和されてドレン排水口３８から外部に排出される。 At this time, the water vapor contained in the combustion gas is condensed in the hot water supply secondary heat exchanger 13 to become acidic drain water, and this drain water is neutralized by the neutralizer 37 and discharged from the drain drain port 38 to the outside. .
次に、湯張り運転後の風呂の追い焚き運転について説明する。
リモコン３６の操作等により追い焚き運転が開始されると、風呂ポンプ３１が作動して浴槽７の湯水が風呂戻り通路２７を通って風呂熱交換器１２へ送られる。水流ＳＷ３２がこの湯水の流れを検知すると、上述の給湯運転と同様に燃焼部１０において燃焼が開始され、燃焼ガスが風呂熱交換器１２へ送られる。風呂熱交換器１２において燃焼ガスの顕熱により加熱された浴槽７の湯水は、風呂往き通路２８を通って浴槽７に貯留される。
Next, the reheating operation of the bath after the hot water filling operation will be described.
When the reheating operation is started by operating the remote controller 36 or the like, the bath pump 31 is activated and the hot and cold water of the bathtub 7 is sent to the bath heat exchanger 12 through the bath return passage 27. When the water flow SW32 detects the flow of the hot water, combustion is started in the combustion section 10 and the combustion gas is sent to the bath heat exchanger 12 as in the hot water supply operation described above. Hot water in the bathtub 7 heated by the sensible heat of the combustion gas in the bath heat exchanger 12 is stored in the bathtub 7 through the bath passage 28.
このとき、給湯１次熱交換器１１も同時に加熱されるが、給湯１次熱交換器１１内の上水が沸騰する前に沸騰防止温度センサ２３が予め定められた第１の基準温度（例えば９５℃）に達すると燃焼を停止させ、予め定められた第２の基準温度（例えば９０℃）以下に降温すると燃焼を開始させる。この燃焼の開始と停止を追い焚き運転の間繰り返して、風呂設定温度になるまで浴槽７の湯水を追い焚き加熱する。 At this time, the hot water supply primary heat exchanger 11 is also heated at the same time, but before the clean water in the hot water supply primary heat exchanger 11 boils, the boiling prevention temperature sensor 23 has a predetermined first reference temperature (for example, When the temperature reaches 95 ° C., the combustion is stopped, and when the temperature is lowered to a predetermined second reference temperature (for example, 90 ° C.) or lower, the combustion is started. This start and stop of combustion is repeated during the reheating operation, and the hot and cold water of the bathtub 7 is reheated and heated until the bath set temperature is reached.
次に、浴槽７の低温の残り湯を追い焚き加熱する追い焚き単独運転の際に実施される風呂温度センサ３３の異常検知について説明する。 Next, the abnormality detection of the bath temperature sensor 33, which is carried out during the reheating single operation in which the low temperature remaining hot water in the bathtub 7 is reheated and heated, will be described.
上述の追い焚き運転と同様に、追い焚き単独運転が開始されると燃焼部１０において燃焼が開始され、風呂熱交換器１２において浴槽７の水が加熱され、沸騰防止温度センサ２３が第１の基準温度に達すると燃焼を停止し、第２の基準温度以下に降温すると燃焼を開始する。この燃焼の開始と停止を追い焚き単独運転の間繰り返して、風呂設定温度になるまで浴槽７の水を追い焚き加熱する。 Similar to the above-described reheating operation, when the reheating single operation is started, combustion is started in the combustion unit 10, the water in the bathtub 7 is heated in the bath heat exchanger 12, and the boiling prevention temperature sensor 23 is set to the first. When the reference temperature is reached, the combustion is stopped, and when the temperature is lowered below the second reference temperature, the combustion is started. The start and stop of the combustion are repeated during the reheating-only operation, and the water in the bathtub 7 is reheated and heated until the bath set temperature is reached.
追い焚き単独運転を開始してから最初に第１の基準温度に達したときに、風呂温度センサ３３に検知された風呂戻り温度を記憶手段３５に記憶させる。追い焚き単独運転開始後に沸騰防止温度センサ２３の検知温度が所定の温度（例えば５０℃）以上上昇したときに、対応する風呂戻り温度を記憶手段３５に記憶させるようにしてもよい。 The bath return temperature detected by the bath temperature sensor 33 is stored in the storage means 35 when the first reference temperature is reached for the first time after the start of the additional heating operation. When the temperature detected by the boiling prevention temperature sensor 23 increases by a predetermined temperature (for example, 50 ° C.) or more after the start of the additional heating operation, the corresponding bath return temperature may be stored in the storage unit 35.
記憶手段３５に記憶された風呂戻り温度は、次回以降の風呂追い焚き単独運転時の異常判定基準として使用される。異常判定基準として記憶手段３５に記憶させる風呂戻り温度は、１缶２水型給湯装置１の設置工事後またはメンテナンス後に行う試運転時の風呂戻り温度であるが、複数回の風呂追い焚き単独運転に対応させて複数個の風呂戻り温度を記憶させてもよく、古い風呂戻り温度を消去して新たに風呂戻り温度を記憶させるように更新可能にしてもよい。また、複数の風呂戻り温度を記憶している場合は、その平均温度等を異常判定基準とすることもできる。 The bath return temperature stored in the storage means 35 is used as a criterion for abnormality in the bath reheating independent operation after the next time. The bath return temperature to be stored in the storage means 35 as the abnormality determination reference is the bath return temperature during the trial operation performed after the installation work or the maintenance of the one-can-two-water hot water supply device 1. A plurality of bath return temperatures may be stored in association with each other, or an old bath return temperature may be erased and updated so that a new bath return temperature is stored. When a plurality of bath return temperatures are stored, the average temperature or the like can be used as the abnormality determination standard.
異常判定基準として前回以前の風呂戻り温度が１つ記憶されている場合に、その記憶されている風呂戻り温度と、今回の追い焚き単独運転を開始後に最初に第１の基準温度に達したときの風呂戻り温度とを比較する。比較した温度差が予め定められた所定値未満（例えば１℃未満）の場合は、風呂温度センサ３３は正常であると判定して風呂戻り温度が風呂設定温度になるまで追い焚き単独運転を継続する。温度差が予め定められた所定値以上（例えば１℃以上）となった場合には、風呂温度センサ３３に異常が発生していると判定して、追い焚き単独運転を停止し、ユーザに風呂温度センサ３３の異常を報知する。尚、風呂温度センサ３３の異常と判定された場合には、風呂の追い焚き運転は制限されるが、給湯運転については実行可能としてもよく、制限してもよい。 When one bath return temperature before the last time is stored as the abnormality determination reference, and the stored bath return temperature and the first reference temperature is first reached after starting this reheating independent operation Compare with the bath return temperature. When the compared temperature difference is less than a predetermined value (for example, less than 1 ° C.) set in advance, the bath temperature sensor 33 determines that the bath temperature is normal and continues the additional heating operation until the bath return temperature reaches the bath set temperature. To do. When the temperature difference is equal to or higher than a predetermined value (for example, 1 ° C. or higher), it is determined that an abnormality has occurred in the bath temperature sensor 33, the additional heating operation is stopped, and the bath is instructed to the user. The abnormality of the temperature sensor 33 is notified. When it is determined that the bath temperature sensor 33 is abnormal, the bath reheating operation is limited, but the hot water supply operation may be executable or may be limited.
次に、追い焚き運転を停止してから予め定められた待機時間の経過後に実施される風呂温度センサ３３の異常検知について説明する。
上述の給湯運転や追い焚き運転を停止してから予め定められた待機時間（例えば５時間）が経過すると、出湯通路６や風呂追い焚き通路８に滞留した湯水は放熱して外装ケース２の内部の雰囲気温度に近づくが、外装ケース２の内部の雰囲気温度以下になることは通常あり得ない。
Next, the abnormality detection of the bath temperature sensor 33, which is performed after the elapse of a predetermined waiting time after stopping the reheating operation, will be described.
When a predetermined waiting time (for example, 5 hours) elapses after stopping the hot water supply operation or the reheating operation, the hot water that has accumulated in the hot water outlet passage 6 or the bath reheating passage 8 radiates heat and the inside of the outer case 2 However, it is not possible for the ambient temperature of the inside of the outer case 2 to become lower than the ambient temperature.
従って、待機時間経過後に雰囲気温度センサ９により検知された外装ケース２の内部の雰囲気温度と、風呂温度センサ３３により検知された風呂戻り温度とを比較して、風呂戻り温度が雰囲気温度以下である場合には風呂温度センサ３３に異常が発生していると判定して、これ以降の風呂追い焚き運転を制限し、風呂温度センサ３３の異常を報知する。尚、風呂温度センサ３３以外の沸騰防止温度センサ２３や給湯出湯温度センサ２６等についても、同様の異常検出を行うことができる。 Therefore, by comparing the ambient temperature inside the exterior case 2 detected by the ambient temperature sensor 9 after the lapse of the standby time with the bath return temperature detected by the bath temperature sensor 33, the bath return temperature is equal to or lower than the ambient temperature. In this case, it is determined that an abnormality has occurred in the bath temperature sensor 33, the subsequent bath reheating operation is limited, and the abnormality of the bath temperature sensor 33 is notified. The same abnormality detection can be performed on the boiling prevention temperature sensor 23 and the hot water supply / outflow temperature sensor 26 other than the bath temperature sensor 33.
以上、説明したように、本発明の１缶２水型給湯装置１は、湯張り運転時以外に給湯の湯水と風呂の湯水、または雰囲気と風呂の湯水のように異なる検知対象の温度を検知して、風呂温度センサ３３の異常を検出することができる。 As described above, the one-can / two-water hot water supply device 1 of the present invention detects different temperature of a detection target such as hot water for hot water supply and hot water for bath, or atmosphere and hot water for bath, except during the filling operation. Then, the abnormality of the bath temperature sensor 33 can be detected.
尚、本発明の１缶２水型給湯装置１は、熱源機３で加熱された湯水により浴槽７に湯張りをする際には、給湯出湯温度センサ２６で検知される温度と両搬送により風呂追い焚き通路８を流れる湯水の風呂温度センサ３３で検知される温度とを比較することにより、給湯出湯温度センサ２６と風呂温度センサ３３の異常を検知することも可能である。 In addition, when filling the bathtub 7 with hot water heated by the heat source device 3, the one-can-two-water hot water supply device 1 of the present invention has a temperature detected by the hot water supply and discharge hot water temperature sensor 26 and a bath due to both conveyances. By comparing the temperature detected by the bath temperature sensor 33 of the hot water flowing through the reheating passage 8 with the hot water supply temperature sensor 26 and the bath temperature sensor 33, it is possible to detect an abnormality.
その他、当業者であれば、本発明の趣旨を逸脱することなく、前記実施例に種々の変更を付加した形態で実施可能であり、本発明はそのような変更形態を包含するものである。 In addition, those skilled in the art can implement various modifications to the embodiment without departing from the spirit of the present invention, and the present invention includes such modifications.
１ １缶２水型給湯装置
２ 外装ケース
３ 熱源機
４ 制御ユニット
５ 給水通路
６ 出湯通路
７ 浴槽
８ 風呂追い焚き通路
９ 雰囲気温度センサ（雰囲気温度検知手段）
１０ 燃焼部
１１ 給湯１次熱交換器（給湯加熱部）
１２ 風呂熱交換器
２３ 沸騰防止温度センサ（給湯温度検知手段）
２６ 給湯出湯温度センサ
２７ 風呂戻り通路
２８ 風呂往き通路
３３ 風呂温度センサ（浴槽温度検知手段）
３５ 記憶手段
1 1 can 2 water type hot water supply device 2 exterior case 3 heat source device 4 control unit 5 water supply passage 6 hot water passage 7 bath 8 bath reheating passage 9 atmosphere temperature sensor (atmosphere temperature detection means)
10 Combustion Section 11 Hot Water Supply Primary Heat Exchanger (Hot Water Supply Heating Section)
12 Bath heat exchanger 23 Boiling prevention temperature sensor (hot water temperature detection means)
26 Hot Water Supply Hot Water Depth Sensor 27 Bath Return Passage 28 Bath Passage Passage 33 Bath Temperature Sensor (Bath Temperature Detection Means)
35 storage means
Claims (3)
給湯加熱部の温度を検知する給湯温度検知手段と、風呂戻り温度を検知する浴槽温度検知手段と、風呂を追い焚き加熱する追い焚き単独運転時に給湯加熱部の温度が予め定められた基準温度に最初に到達したときの風呂戻り温度を記憶する記憶手段とを備え、
前記追い焚き単独運転時に前記給湯加熱部の温度が前記基準温度に最初に到達したときの風呂戻り温度と、前回以前の追い焚き単独運転時に前記記憶手段に記憶された風呂戻り温度とを比較して、温度差が所定値以上になった場合には前記浴槽温度検知手段に異常が生じていると判定することを特徴とする１缶２水型給湯装置。 In a one-can-two-water hot water supply device that heats hot water and heats the bath by heating in a common combustion section,
Hot water supply temperature detecting means for detecting the temperature of the hot water supply heating section, bath temperature detecting means for detecting the bath return temperature, and hot water heating section for heating and reheating the bath to a predetermined reference temperature during independent operation. And a storage means for storing the bath return temperature when the temperature is first reached,
The bath return temperature when the temperature of the hot water supply heating unit first reaches the reference temperature during the reheating single operation is compared with the bath return temperature stored in the storage unit during the previous reheating single operation. The one-can-two-water hot water supply device is characterized in that when the temperature difference exceeds a predetermined value, it is determined that the bath temperature detecting means is abnormal.
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