JP5009743B2 - Hot water storage water heater - Google Patents

Hot water storage water heater Download PDF

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JP5009743B2
JP5009743B2 JP2007277143A JP2007277143A JP5009743B2 JP 5009743 B2 JP5009743 B2 JP 5009743B2 JP 2007277143 A JP2007277143 A JP 2007277143A JP 2007277143 A JP2007277143 A JP 2007277143A JP 5009743 B2 JP5009743 B2 JP 5009743B2
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mixing valve
water
pipe
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JP2009103386A (en
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誠 本間
洋 菊池
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Corona Corp
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Description

この発明は貯湯タンク内の中温水を積極的に使用するための中温水混合弁を備えたもので、給湯用或いは風呂用混合弁の故障時に安全側に制御する貯湯式給湯装置に関するものである。   BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water storage hot water supply device that is provided with a medium temperature water mixing valve for actively using medium temperature water in a hot water storage tank and that is controlled to be safe when a hot water supply or bath mixing valve fails. .

従来よりこの種のものに於いては、貯湯タンク内に貯湯された高温水を取り出して暖房や風呂の追焚きの熱源として用いるものが提案されており、熱交換によって温度低下した中温水が貯湯タンク内に戻されると共に、貯湯タンクの中間部からこの中温水を取り出して給湯に用いるものがあった。そして、この中温水は貯湯タンク上部からの高温水と合流し給湯設定温度以上の温度に混合されて給湯されるものであった。（例えば、特許文献１参照。）
特許第３８５４１６９号公報 Conventionally, in this type of water, hot water stored in a hot water storage tank has been taken out and used as a heat source for heating or reheating the hot water. Some returned to the inside of the tank, and the intermediate hot water was taken out from the middle part of the hot water storage tank and used for hot water supply. And this middle temperature water merged with the high temperature water from the hot water storage tank upper part, was mixed with the temperature more than the hot water supply preset temperature, and was supplied. (For example, refer to Patent Document 1.)
Japanese Patent No. 3854169

ところでこの従来のものでは、給湯用の第１混合弁が高温側で故障した場合、中温水混合弁からの混合水はリモコンの設定温度より所定温度高い温度の温水がそのまま給湯されることとなり、火傷の危険を有するものであった。   By the way, in this conventional one, when the first mixing valve for hot water supply fails on the high temperature side, the mixed water from the intermediate hot water mixing valve is supplied with hot water as it is at a predetermined temperature higher than the set temperature of the remote controller. There was a risk of burns.

この発明はこの点に着目し上記課題を解決するために、特にその構成を、請求項１では、給水管が下端部に接続されていると共に貯湯している高温水を流出させる出湯管が上端部に接続されている貯湯タンクと、この貯湯タンク内の湯水を高温に加熱する加熱手段と、熱交換により生成された中温水を前記貯湯タンクから流出させるための中温水出湯管と、前記出湯管からの高温水と前記中温水出湯管からの中温水を任意の所定温度に混合する中温水混合弁と、前記中温水混合弁で混合された湯と前記給水管から分岐された第１バイパス管からの低温水とを任意の第１給湯設定温度に混合して第１給湯端から給湯させる第１混合弁と、前記中温水混合弁で混合された湯と前記給水管から分岐された第２バイパス管からの低温水とを任意の第２給湯設定温度に混合して第２給湯端から給湯させる第２混合弁とを備えたものに於いて、前記第１混合弁或いは第２混合弁の少なくてもどちらか一方の低温側での故障では、通常の制御とし、高温側での故障では、中温水混合弁を出湯管側を絞り中温水出湯管側を優先の制御としたものである。 This invention pays attention to this point, and in order to solve the above-mentioned problem , in particular, in claim 1, the water supply pipe is connected to the lower end portion and the hot water discharge pipe for discharging the hot water stored in the hot water is at the upper end. A hot water storage tank connected to the hot water storage unit, heating means for heating the hot water in the hot water storage tank to a high temperature, an intermediate temperature hot water discharge pipe for allowing the intermediate temperature water generated by heat exchange to flow out of the hot water storage tank, and the hot water supply An intermediate temperature water mixing valve for mixing hot water from a pipe and intermediate temperature water from the intermediate temperature water discharge pipe to an arbitrary predetermined temperature, a first bypass branched from the hot water mixed by the intermediate temperature water mixing valve and the water supply pipe A first mixing valve that mixes low-temperature water from a pipe with an arbitrary first hot water supply set temperature and supplies hot water from a first hot water supply end; hot water mixed by the intermediate temperature water mixing valve; 2 Optional low temperature water from the bypass pipe In that a second mixing valve for hot water from the second hot-water supply terminal by mixing the hot water set temperature, failure at the first mixing valve or fewer or either the low temperature side of the second mixing valve Then, normal control is used, and in the case of a failure on the high temperature side, the intermediate hot water mixing valve is throttled on the side of the hot water pipe and the control on the side of the intermediate hot water hot water pipe is prioritized.

又請求項２では、給水管が下端部に接続されていると共に貯湯している高温水を流出させる出湯管が上端部に接続されている貯湯タンクと、この貯湯タンク内の湯水を高温に加熱する加熱手段と、熱交換により生成された中温水を前記貯湯タンクから流出させるための中温水出湯管と、前記出湯管からの高温水と前記中温水出湯管からの中温水を任意の所定温度に混合する中温水混合弁と、前記中温水混合弁で混合された湯と前記給水管から分岐された第１バイパス管からの低温水とを任意の第１給湯設定温度に混合して第１給湯端から給湯させる第１混合弁と、前記中温水混合弁で混合された湯と前記給水管から分岐された第２バイパス管からの低温水とを任意の第２給湯設定温度に混合して第２給湯端から給湯させる第２混合弁とを備えたものに於いて、前記第１混合弁或いは第２混合弁の少なくてもどちらか一方の低温側での故障では、通常の制御とし、高温側での故障では、中温水混合弁を出湯管側閉塞で中温水出湯管側全開としたものである。 Further, in claim 2, a hot water storage tank having a hot water supply pipe connected to the upper end of the hot water storage pipe connected to the lower end of the hot water and a hot water stored in the hot water storage tank is heated to a high temperature. Heating means, intermediate temperature hot water discharge pipe for allowing intermediate temperature water generated by heat exchange to flow out of the hot water storage tank, high temperature water from the hot water discharge pipe, and intermediate temperature water from the intermediate temperature water discharge pipe at any predetermined temperature A first hot water mixing valve, a hot water mixed by the intermediate hot water mixing valve, and a low-temperature water from the first bypass pipe branched from the water supply pipe to an arbitrary first hot water supply set temperature. A first mixing valve for supplying hot water from a hot water supply end, hot water mixed by the intermediate temperature water mixing valve, and low-temperature water from a second bypass pipe branched from the water supply pipe are mixed at an arbitrary second hot water supply set temperature. A second mixing valve for supplying hot water from the second hot water supply end In those, wherein in the failure of the first mixing valve or fewer or either the low temperature side of the second mixing valve, with a normal control, the failure of the high-temperature side, hot water pipe side medium hot water mixing valve The middle hot water discharge pipe side is fully opened due to the blockage.

以上のようにこの発明によれば、給湯用の第１混合弁或いは風呂用の第２混合弁のどちらか一方の低温側での故障では、火傷の危険がないので通常の制御とするが、高温側で故障した時には、出来るだけ高温水を出湯しないように中温水混合弁を制御することで、火傷の危険がない中温水を給湯や風呂に使用出来、修理業者が来るまで使用出来ない不具合が解消されるものであり、常に安心して使用出来るものである。 As described above, according to the present invention, in the failure on the low temperature side of either the first mixing valve for hot water supply or the second mixing valve for bath , there is no risk of burns. In the event of a malfunction on the high temperature side, the medium temperature water mixing valve is controlled so that hot water is not discharged as much as possible, so that medium temperature water without the risk of burns can be used for hot water and baths, and cannot be used until a repairer arrives. Is eliminated and can always be used with peace of mind.

又請求項２によれば、更に確実に中温水が使用されることで、安全であると共に加熱手段による加熱が低温水から行われることによるＣＯＰ（エネルギー消費効率）の向上を得ることが出来るものである。   According to the second aspect of the present invention, it is possible to obtain COP (energy consumption efficiency) improvement by using medium-temperature water more reliably and safely and by heating from the low-temperature water. It is.

次に、本発明の一実施形態の貯湯式給湯装置を図１〜図１０に基づき説明する。なお、図２〜図１０中の貯湯タンク内にハッチングした斜線は低温水、二重斜線は中温水、三重斜線は高温水を示し、矢印は湯水の流れ方向を示すものである。   Next, a hot water storage type hot water supply apparatus according to an embodiment of the present invention will be described with reference to FIGS. 2 to 10, hatched hatched lines in the hot water storage tank indicate low temperature water, double hatched lines indicate medium hot water, triple hatched lines indicate hot water, and arrows indicate the flow direction of hot water.

この貯湯式給湯装置は、時間帯別契約電力の電力単価が安価な深夜時間帯に湯水を沸き上げて貯湯し、この貯湯した湯水を給湯に用いるもので、１は湯水を貯湯する貯湯タンク２を備えた貯湯タンクユニット、３は貯湯タンク内の湯水を加熱するヒートポンプユニット、４は台所や洗面所等に設けられた第１給湯端たる給湯栓、５はこの給湯栓４の近傍に設けられた給湯リモコン、６は浴槽、７は浴室に設けられた風呂リモコンである。   This hot water storage type hot water supply device boils and stores hot water in the midnight hours when the unit price of contracted power by time is low, and uses the hot water stored for hot water supply. 1 is a hot water storage tank 2 for storing hot water. 3 is a heat pump unit for heating hot water in the hot water storage tank, 4 is a hot water tap as a first hot water supply end provided in a kitchen or a washroom, and 5 is provided in the vicinity of the hot water tap 4. A hot water supply remote control, 6 is a bathtub, and 7 is a bath remote control provided in the bathroom.

前記貯湯タンクユニット１の貯湯タンク２は、上端に出湯管８と、下端に給水管９とが接続され、さらに、下部にヒーポン往き管１０と、上部にヒーポン戻り管１１とか接続され、前記ヒートポンプユニット３によってヒーポン往き管１０から取り出した貯湯タンク２内の湯水を沸き上げてヒーポン戻り管１１から貯湯タンク２内に戻して貯湯され、給水管９からの給水により貯湯タンク２内の湯水が押し上げられて貯湯タンク２内上部の高温水が出湯管８から押し出されて給湯されるものである。   The hot water storage tank 2 of the hot water storage tank unit 1 has a hot water discharge pipe 8 connected to the upper end, a water supply pipe 9 connected to the lower end, a heat pump forward pipe 10 connected to the lower part, and a heat pump return pipe 11 connected to the upper part. The hot water in the hot water storage tank 2 taken out from the heat pump forward pipe 10 by the unit 3 is boiled and returned to the hot water storage tank 2 from the heat pump return pipe 11 to be stored, and hot water in the hot water storage tank 2 is pushed up by the water supply from the water supply pipe 9. The hot water in the upper part of the hot water storage tank 2 is pushed out from the hot water discharge pipe 8 to supply hot water.

前記ヒートポンプユニット３は、圧縮機１２と凝縮器としての冷媒−水熱交換器１３と電子膨張弁１４と強制空冷式の蒸発器１５で構成された加熱手段としてのヒートポンプ回路１６と、貯湯タンク２内の湯水を前記ヒーポン往き管１０およびヒーポン戻り管１１を介して冷媒−水熱交換器１３に循環させるヒーポン循環ポンプ１７と、それらの駆動を制御するヒーポン制御部１８とを備えており、ヒートポンプ回路１６内には冷媒として二酸化炭素が用いられて超臨界ヒートポンプサイクルを構成しているものである。なお、冷媒に二酸化炭素を用いているので、低温水を電熱ヒータなしで約９０℃の高温まで沸き上げることが可能なものである。   The heat pump unit 3 includes a compressor 12, a refrigerant-water heat exchanger 13 as a condenser, an electronic expansion valve 14, a forced air-cooled evaporator 15, a heat pump circuit 16 as a heating means, and a hot water storage tank 2. A heat pump circulating pump 17 for circulating the hot water in the refrigerant to the refrigerant-water heat exchanger 13 via the heat pump forward pipe 10 and the heat pump return pipe 11, and a heat pump controller 18 for controlling the driving of the heat pump. In the circuit 16, carbon dioxide is used as a refrigerant to constitute a supercritical heat pump cycle. Since carbon dioxide is used as the refrigerant, low-temperature water can be boiled up to a high temperature of about 90 ° C. without an electric heater.

ここで、前記冷媒−水熱交換器１３は冷媒と被加熱水たる貯湯タンク２内の湯水とが対向して流れる対向流方式を採用しており、超臨界ヒートポンプサイクルでは熱交換時において冷媒は超臨界状態のまま凝縮されるため効率良く高温まで被加熱水を加熱することができ、被加熱水の冷媒−水熱交換器１３入口温度と冷媒の出口温度との温度差が一定になるように前記減圧器１４または圧縮機１２を制御することで、被加熱水の冷媒−水熱交換器１３の入口温度が５〜２０℃程度の低い温度であるとＣＯＰ（エネルギー消費効率）が３．０以上のとても良い状態で被加熱水を加熱することが可能なものである。   Here, the refrigerant-water heat exchanger 13 employs a counter flow system in which the refrigerant and hot water in the hot water storage tank 2 that is heated water face each other, and in the supercritical heat pump cycle, the refrigerant is exchanged during heat exchange. Since the water to be heated can be efficiently heated to a high temperature because it is condensed in a supercritical state, the temperature difference between the refrigerant-water heat exchanger 13 inlet temperature and the refrigerant outlet temperature is made constant. By controlling the pressure reducer 14 or the compressor 12, the COP (energy consumption efficiency) is 3.3 when the inlet temperature of the refrigerant-water heat exchanger 13 to be heated is a low temperature of about 5 to 20 ° C. It is possible to heat the water to be heated in a very good state of 0 or more.

１９は前記浴槽６の湯水を加熱するための熱交換器で、その一次側には貯湯タンク２上部に接続された高温水往き管２０と貯湯タンク２下部に接続された中温水戻り管２１とが接続されて熱交循環回路２２を構成し、中温水戻り管２１途中に設けられた熱交循環ポンプ２３の作動により貯湯タンク２から取り出した高温水を熱交換器１９に循環させ、熱交換により温度低下した中温水を再び貯湯タンク２内に戻すものである。   Reference numeral 19 denotes a heat exchanger for heating the hot water in the bathtub 6, and on the primary side thereof, there are a high temperature water discharge pipe 20 connected to the upper part of the hot water storage tank 2 and an intermediate hot water return pipe 21 connected to the lower part of the hot water storage tank 2. Is connected to form a heat exchanger circuit 22, and high-temperature water taken out from the hot water storage tank 2 is circulated to the heat exchanger 19 by operating a heat exchanger pump 23 provided in the middle hot water return pipe 21 to exchange heat. Accordingly, the medium-temperature water whose temperature has been lowered by the above is returned to the hot water storage tank 2 again.

前記熱交換器１９の二次側には、浴槽６の湯水を循環可能に風呂往き管２４と風呂戻り管２５より構成される風呂循環回路２６が接続され、風呂戻り管２５途中に設けられた風呂循環ポンプ２７の作動により浴槽６の湯水が熱交換器１９に循環されて、一次側の高温水により加熱されて浴槽６内の湯水の保温あるいは追焚きが行われるものである。なお、２８は風呂戻り管２５を循環する浴槽６の湯水の温度を検出する風呂温度センサである。   On the secondary side of the heat exchanger 19, a bath circulation circuit 26 composed of a bath outlet pipe 24 and a bath return pipe 25 is connected so as to be able to circulate hot water in the bathtub 6, and is provided in the middle of the bath return pipe 25. The hot water in the bathtub 6 is circulated to the heat exchanger 19 by the operation of the bath circulation pump 27 and heated by the high temperature water on the primary side, so that the hot water in the bathtub 6 is kept warm or chased. Reference numeral 28 denotes a bath temperature sensor that detects the temperature of hot water in the bathtub 6 circulating through the bath return pipe 25.

次に、２９は前記中温水戻り管２１より高く前記出湯管８より低い貯湯タンク２の中間位置に接続された中温水出湯管で、前記熱交換器１９で二次側と熱交換して温度低下した中温水を貯湯タンク２から出湯するものである。   Next, 29 is an intermediate temperature hot water discharge pipe connected to an intermediate position of the hot water storage tank 2 which is higher than the intermediate hot water return pipe 21 and lower than the hot water discharge pipe 8, and exchanges heat with the secondary side in the heat exchanger 19. The lowered medium temperature water is discharged from the hot water storage tank 2.

３０は、前記中温水出湯管２９の下流に設けられた中温水混合弁で、貯湯タンク２中間位置付近の中温水と貯湯タンク２上端に接続された出湯管８からの高温水とを、その下流の第１出湯管３１に設けた出湯温度センサ３２で検出する湯温が、給湯リモコン５または風呂リモコン７でユーザーが設定した給湯設定温度（第１給湯設定温度）または風呂設定温度（第２給湯設定温度）より一定温度（例えば５℃）高い温度である任意の所定温度になるように混合比率を制御するものである。   Reference numeral 30 denotes an intermediate temperature water mixing valve provided downstream of the intermediate temperature hot water discharge pipe 29. The intermediate temperature water mixing valve near the intermediate position of the hot water storage tank 2 and hot water from the hot water discharge pipe 8 connected to the upper end of the hot water storage tank 2 are The hot water temperature detected by the hot water temperature sensor 32 provided on the downstream first hot water pipe 31 is the hot water supply set temperature (first hot water set temperature) or the bath set temperature (second temperature) set by the user using the hot water remote controller 5 or the bath remote controller 7. The mixing ratio is controlled to be an arbitrary predetermined temperature that is a constant temperature (for example, 5 ° C.) higher than the (hot water supply set temperature).

ここで、前記中温水出湯管２９は出湯口切換弁３３を介して貯湯タンク２の中間位置の上下に設けられた第１中温水出湯口３４と第２中温水出湯口３５に接続され、何れか一方の出湯口から貯湯タンク２の中間位置付近に貯められている中温水を中温水混合弁３０に向けて出湯するものであり、下方の第１中温水出湯口３４より少し下方の貯湯タンク２側面に設けられた中温水温度センサ３６の検出する温度に応じて出湯口切換弁３３を切換えるようにしている。   Here, the intermediate hot water outlet pipe 29 is connected via a hot water outlet switching valve 33 to a first intermediate hot water outlet 34 and a second intermediate hot water outlet 35 provided above and below an intermediate position of the hot water storage tank 2. Middle hot water stored near the intermediate position of the hot water storage tank 2 from one of the hot water outlets is discharged toward the intermediate hot water mixing valve 30, and the hot water storage tank slightly below the first intermediate warm water hot water outlet 34 below. The hot water outlet switching valve 33 is switched according to the temperature detected by the medium hot water temperature sensor 36 provided on the two side surfaces.

次に、３７は第１出湯管３１からの湯水と給水管９から分岐された第１バイパス管３８からの低温水を混合する電動ミキシング弁より構成された給湯混合弁（第１混合弁）であり、その下流の給湯管３９に設けた給湯温度センサ４０で検出した湯温が給湯リモコン５または風呂リモコン７でユーザーが設定した給湯設定温度になるように混合比率を制御するものである。   Next, 37 is a hot water supply mixing valve (first mixing valve) constituted by an electric mixing valve that mixes hot water from the first hot water discharge pipe 31 and low temperature water from the first bypass pipe 38 branched from the water supply pipe 9. The mixing ratio is controlled so that the hot water temperature detected by the hot water temperature sensor 40 provided in the downstream hot water supply pipe 39 becomes the hot water set temperature set by the user using the hot water remote controller 5 or the bath remote controller 7.

また、４１は前記第１出湯管３１から分岐された第２出湯管４２からの湯水と、給水管９から分岐された第２バイパス管４３からの低温水とを混合する電動ミキシング弁より構成された風呂混合弁（第２混合弁）であり、その下流側の前記風呂循環回路２６に連通された第２給湯端たる湯張り管４４に設けた湯張り温度センサ４５で検出した湯温が風呂リモコン７でユーザーが設定した風呂設定温度になるように混合比率を制御するものである。   Reference numeral 41 denotes an electric mixing valve that mixes hot water from the second hot water pipe 42 branched from the first hot water pipe 31 and low-temperature water from the second bypass pipe 43 branched from the water supply pipe 9. The hot water temperature detected by the hot water temperature sensor 45 provided in the hot water pipe 44 as the second hot water supply end connected to the bath circulation circuit 26 on the downstream side of the bath mixing valve (second mixing valve) is the bath temperature. The mixing ratio is controlled so that the remote controller 7 sets the bath set temperature set by the user.

そして、前記湯張り管４４には、風呂循環回路２６を介した浴槽６への湯張りの開始／停止を行う湯張り弁４６と、浴槽６への湯張り量をカウントする風呂流量カウンタ４７が設けられているものである。   The hot water filling pipe 44 has a hot water filling valve 46 for starting / stopping hot water filling to the bathtub 6 via the bath circulation circuit 26 and a bath flow rate counter 47 for counting the amount of hot water filling to the bathtub 6. It is provided.

次に、４８は貯湯タンク２の上下方向に複数個配置された貯湯温度センサで、この貯湯温度センサ４８が検出する温度情報によって、貯湯タンク２内にどれだけの熱量が残っているかを検知し、そして貯湯タンク２内の上下方向の温度分布を検知するものである。   Next, a plurality of hot water storage temperature sensors 48 are arranged in the vertical direction of the hot water storage tank 2, and the amount of heat remaining in the hot water storage tank 2 is detected based on temperature information detected by the hot water storage temperature sensor 48. And the temperature distribution of the up-down direction in the hot water storage tank 2 is detected.

前記給湯リモコン５および風呂リモコン７には、給湯設定温度（第１給湯設定温度）を設定する給湯温度設定スイッチ４９、５０、および風呂設定温度（第２給湯設定温度）を設定する風呂温度設定スイッチ５１、５２がそれぞれ設けられていると共に、浴槽６へ風呂設定温度（第２給湯設定温度）の湯を風呂リモコン７の湯張り量設定スイッチ（図示せず）で設定された湯張り量だけ湯張りし所定時間保温させる風呂自動スイッチ５３、５４がそれぞれ設けられているものである。   The hot water remote controller 5 and the bath remote controller 7 include hot water temperature setting switches 49 and 50 for setting a hot water set temperature (first hot water set temperature), and a bath temperature setting switch for setting a bath set temperature (second hot water set temperature). 51 and 52 are provided, respectively, and hot water of a bath set temperature (second hot water supply set temperature) is supplied to the bathtub 6 by a hot water amount set by a hot water amount setting switch (not shown) of the bath remote controller 7. Bath automatic switches 53 and 54 that are stretched and kept warm for a predetermined time are respectively provided.

５５は貯湯タンクユニット１内の各センサの入力を受け各アクチュエータの駆動を制御するマイコンを有した給湯制御部である。この給湯制御部５５に前記給湯リモコン５および風呂リモコン７が無線または有線により接続されユーザーが任意の給湯設定温度（第１給湯設定温度）および風呂設定温度（第２給湯設定温度）を設定できるようにしているものである。   Reference numeral 55 denotes a hot water supply control unit having a microcomputer that receives the input of each sensor in the hot water storage tank unit 1 and controls the drive of each actuator. The hot water remote controller 5 and the bath remote controller 7 are connected to the hot water controller 55 by radio or wire so that the user can set an arbitrary hot water set temperature (first hot water set temperature) and bath set temperature (second hot water set temperature). It is what you are doing.

又前記給湯制御部５５は、給湯温度センサ４０が給湯設定温度（第１給湯設定温度）より数度高い温度ここでは３℃以上を所定時間以上ここでは５秒以上検出することで、給湯混合弁（第１混合弁）３７が高温側で故障したと判断して、給湯混合弁３７の高温側故障エラーを出力し、各リモコン５、７に給湯混合弁３７の高温側故障のエラー表示させると共に、中温水混合弁３０を出湯管８側を絞って高温水の出湯を少なくし、中温水出湯管２９側から優先して火傷の危険がない中温水を多く出湯するように固定制御するものである。   The hot water supply control unit 55 detects the temperature of the hot water supply temperature sensor 40 at a temperature several degrees higher than the hot water supply set temperature (first hot water set temperature), here 3 ° C. or more, for a predetermined time or more, here 5 seconds or more. (First mixing valve) 37 is determined to have failed on the high temperature side, a high temperature side failure error of hot water supply mixing valve 37 is output, and each remote controller 5, 7 displays an error on the high temperature side failure of hot water supply mixing valve 37. The hot water mixing valve 30 is squeezed on the side of the hot water pipe 8 to reduce hot water hot water, and the hot water is preferentially controlled from the hot water hot water pipe 29 side so as to discharge hot water with no danger of burns. is there.

一方給湯制御部５５は、給湯温度センサ４０が給湯設定温度（第１給湯設定温度）より数度低い温度ここでは−３℃以上を所定時間以上ここでは５秒以上検出することで、給湯混合弁（第１混合弁）３７が低温側で故障したと判断して、給湯混合弁３７の低温側故障エラーを出力し、各リモコン５、７に給湯混合弁３７の低温側故障のエラー表示させると共に、通常の制御でも火傷の心配がないので中温水混合弁３０の固定制御は行わないものである。   On the other hand, the hot water supply control unit 55 detects a temperature that is several degrees lower than the hot water supply set temperature (first hot water set temperature), here -3 ° C. or more, for a predetermined time or more, here 5 seconds or more. (First mixing valve) 37 is determined to have failed on the low temperature side, a low temperature side failure error of hot water supply mixing valve 37 is output, and each remote controller 5, 7 displays an error of low temperature side failure of hot water supply mixing valve 37. The normal warm water mixing valve 30 is not fixedly controlled because there is no risk of burns even under normal control.

更に給湯制御部５５は、湯張り温度センサ４５が風呂設定温度（第２給湯設定温度）より数度高い温度ここでは３℃以上を所定時間以上ここでは５秒以上検出することで、風呂混合弁（第２混合弁）４１が高温側で故障したと判断して、風呂混合弁４１の高温側故障エラーを出力し、各リモコン５、７に風呂混合弁４１の高温側故障のエラー表示させると共に、中温水混合弁３０を出湯管８側を絞って高温水の出湯を少なくし、中温水出湯管２９側から優先して火傷の危険がない中温水を多く出湯するように固定制御するものである。   Furthermore, the hot water supply control unit 55 detects the temperature that the hot water temperature sensor 45 is several degrees higher than the bath set temperature (second hot water set temperature), here 3 ° C. or more, for a predetermined time or more, here 5 seconds or more. It is determined that the (second mixing valve) 41 has failed on the high temperature side, a high temperature side failure error of the bath mixing valve 41 is output, and each remote controller 5, 7 displays an error of the high temperature side failure of the bath mixing valve 41. The hot water mixing valve 30 is squeezed on the side of the hot water pipe 8 to reduce hot water hot water, and the hot water is preferentially controlled from the hot water hot water pipe 29 side so as to discharge hot water with no danger of burns. is there.

更に又給湯制御部５５は、湯張り温度センサ４５が風呂設定温度（第２給湯設定温度）より数度低い温度ここでは−３℃以上を所定時間以上ここでは５秒以上検出することで、風呂混合弁（第２混合弁）４１が低温側で故障したと判断して、風呂混合弁４１の低温側故障エラーを出力し、各リモコン５、７に風呂混合弁４１の低温側故障のエラー表示させると共に、通常の制御でも火傷の心配がないので中温水混合弁３０の固定制御は行わないものである。   Furthermore, the hot water supply control unit 55 detects the temperature that the hot water filling temperature sensor 45 is several degrees lower than the bath set temperature (second hot water set temperature), here, −3 ° C. or more for a predetermined time or more, here 5 seconds or more. It is determined that the mixing valve (second mixing valve) 41 has failed on the low temperature side, a low temperature side failure error of the bath mixing valve 41 is output, and an error display of the low temperature side failure of the bath mixing valve 41 is displayed on each remote controller 5, 7. In addition, since there is no risk of burns even under normal control, the middle temperature water mixing valve 30 is not fixedly controlled.

なお、５６は貯湯タンク２の過圧を逃す過圧逃し弁、５７は給水の温度を検出する給水温度センサ、５８は給水の圧力を減圧する減圧弁、５９は給湯する湯水の量をカウントする給湯流量カウンタである。   Note that 56 is an overpressure relief valve for releasing the overpressure of the hot water storage tank 2, 57 is a water supply temperature sensor for detecting the temperature of the water supply, 58 is a pressure reducing valve for reducing the pressure of the water supply, and 59 is for counting the amount of hot water supplied. This is a hot water flow rate counter.

次に、この一実施形態の作動を説明する。
まず、図２に示す沸き上げ運転について説明すると、深夜電力時間帯になって貯湯温度センサ４８が貯湯タンク２内に翌日に必要な熱量が残っていないことを検出すると、給湯制御部５５はヒーポン制御部１８に対して沸き上げ開始指令を発する。指令を受けたヒーポン制御部１８は圧縮機１２を起動した後にヒーポン循環ポンプ１７を駆動開始し、貯湯タンク２下部に接続されたヒーポン往き管１０から取り出した５〜２０℃程度の低温水を冷媒−水熱交換器１３で７０〜９０℃程度の高温に加熱し、貯湯タンク２上部に接続されたヒーポン戻り管１１から貯湯タンク２内に戻し、貯湯タンク２の上部から順次積層して高温水を貯湯していく。貯湯温度センサ４８が必要な熱量が貯湯されたことを検出すると、給湯制御部５５はヒーポン制御部１８に対して沸き上げ停止指令を発し、ヒーポン制御部１８は圧縮機１２を停止すると共にヒーポン循環ポンプ１７も停止して沸き上げ動作を終了するものである。 Next, the operation of this embodiment will be described.
First, the boiling operation shown in FIG. 2 will be described. When the hot water storage temperature sensor 48 detects that the required amount of heat does not remain in the hot water storage tank 2 in the midnight electric power time zone, the hot water supply control section 55 A boiling start command is issued to the control unit 18. Upon receiving the command, the heat pump controller 18 starts driving the heat pump circulation pump 17 after starting the compressor 12, and cools the low temperature water of about 5 to 20 ° C. taken out from the heat pump forward pipe 10 connected to the lower part of the hot water storage tank 2 as a refrigerant. -Heated to a high temperature of about 70 to 90 ° C in the water heat exchanger 13, returned to the hot water storage tank 2 from the heat pump return pipe 11 connected to the upper part of the hot water storage tank 2, and stacked in order from the upper part of the hot water storage tank 2 Store hot water. When the hot water storage temperature sensor 48 detects that the necessary amount of heat has been stored, the hot water supply control unit 55 issues a boiling stop command to the heat pump control unit 18, and the heat pump control unit 18 stops the compressor 12 and heat pump circulation. The pump 17 is also stopped and the boiling operation is finished.

次に、図３に示す給湯運転について説明すると、給湯栓４を開くと、給水管９からの給水が貯湯タンク２内に流れ込む。そしてこのとき、貯湯タンク２内の中温水温度センサ３６の位置には沸き上げられた高温水が貯められているので、中温水温度センサ３６は所定値以上の温度を検出し、給湯制御部５５によって中温水切換弁３３が下側の第１中温水出湯口３４側に切換えられて、第１中温水出湯口３４から中温水出湯管２９を介して中温水混合弁３０へ高温水が押し出される。なお、貯湯タンク２内には上部に高温水、下部に低温水が貯められているが、その温度差により比重差が発生し、温度境界層を形成して比重の軽い高温水が上部に、比重の重い低温水が下部に位置するので、互いに混じり合うことはないものである。   Next, the hot water supply operation shown in FIG. 3 will be described. When the hot water tap 4 is opened, the water supplied from the water supply pipe 9 flows into the hot water storage tank 2. At this time, since the boiled high-temperature water is stored at the position of the medium temperature water temperature sensor 36 in the hot water storage tank 2, the medium temperature water temperature sensor 36 detects a temperature equal to or higher than a predetermined value, and the hot water supply control unit 55. As a result, the intermediate warm water switching valve 33 is switched to the lower first intermediate warm water outlet 34, and hot water is pushed out from the first intermediate warm water outlet 34 to the intermediate warm water mixing valve 30 through the intermediate warm water outlet pipe 29. . In the hot water storage tank 2, high temperature water is stored in the upper part and low temperature water is stored in the lower part. However, a specific gravity difference is generated due to the temperature difference, and a high temperature water having a low specific gravity is formed on the upper part by forming a temperature boundary layer. Since low-temperature water with a high specific gravity is located at the lower part, they do not mix with each other.

ここで、給湯制御部５５は中温水出湯管２９からの湯水と出湯管８からの湯水を混合して中温水混合弁３０にて給湯リモコン５または風呂リモコン７で設定された給湯設定温度（第１給湯設定温度）より一定温度以上高い温度となるように中温水混合弁３０を適当な比率に調整する。なお、ここでは、中温水出湯管２９から流入する湯が高温で給湯設定温度（第１給湯設定温度）より高いため、中温水混合弁３０の出湯管８側を閉じることとなる。   Here, the hot water supply control unit 55 mixes hot water from the hot water tap pipe 29 and hot water from the hot pipe 8 and sets the hot water set temperature (first temperature) set by the hot water remote controller 5 or the bath remote controller 7 at the hot water mixing valve 30. The intermediate temperature water mixing valve 30 is adjusted to an appropriate ratio so that the temperature is higher than a certain temperature by 1 hot water supply set temperature). Here, since the hot water flowing in from the intermediate temperature hot water outlet pipe 29 is hot and higher than the hot water supply set temperature (first hot water supply set temperature), the outlet hot water pipe 8 side of the intermediate temperature water mixing valve 30 is closed.

そして、中温水混合弁３０から流出した湯は第１出湯管３１を介して給湯混合弁（第１混合弁）３６へ流入し、第１バイパス管３８からの低温水と混合され、給湯制御部５５が給湯混合弁（第１混合弁）３６の混合比率を調整し給湯設定温度（第１給湯設定温度）の湯が給湯栓４から給湯される。そして、給湯栓４の閉止によって給湯が終了するものである。   And the hot water which flowed out from the intermediate temperature water mixing valve 30 flows into the hot water supply mixing valve (first mixing valve) 36 through the first hot water discharge pipe 31, and is mixed with the low temperature water from the first bypass pipe 38, and the hot water supply control section. 55 adjusts the mixing ratio of the hot water supply mixing valve (first mixing valve) 36, and hot water at a hot water supply set temperature (first hot water set temperature) is supplied from the hot water tap 4. Then, the hot water supply is completed by closing the hot water tap 4.

ここで、中温水温度センサ３６が所定値以下の温度を検出すると、図４に示すように給湯制御部５５が出湯口切換弁３３を上側の第２中温水出湯口３５側に切換え、第２中温水出湯口３５から高温水を出湯するようにしている。よって、下側の第１中温水出湯口３４付近に高温水あるいは中温水が貯められている場合には第１中温水出湯口３４から出湯し、第１中温水出湯口３４付近に給水管９からの低温水が貯められている場合は第２中温水出湯口３５から出湯されることとなり、貯湯タンク２内の中温水を余すことなく給湯に用いることが可能となるものである。   Here, when the intermediate hot water temperature sensor 36 detects a temperature equal to or lower than a predetermined value, the hot water supply control unit 55 switches the hot water outlet switching valve 33 to the upper second intermediate hot water hot water outlet 35 side as shown in FIG. Hot water is discharged from the intermediate temperature water outlet 35. Therefore, when high temperature water or medium temperature water is stored near the lower first intermediate hot water outlet 34, hot water is discharged from the first intermediate hot water outlet 34, and the water supply pipe 9 is provided near the first intermediate hot water outlet 34. When the low-temperature water from the hot water is stored, the hot water is discharged from the second intermediate hot water outlet 35, and the hot water in the hot water storage tank 2 can be used for hot water supply without being left over.

また、前記中温水混合弁３０は給湯設定温度（第１給湯設定温度）よりも一定温度以上高い温度の湯を第１出湯管３１に供給するようにしているので、第１中温水出湯口３４および第２中温水出湯口３５から出湯する湯水の温度が給湯設定温度（第１給湯設定温度）よりも低い場合は、図５に示すように給湯制御部５５により中温水混合弁３０の混合比率が調整されて出湯管８からの高温水を用いて給湯設定温度（第１給湯設定温度）よりも一定温度高い温度の湯を第１出湯管３１に供給するようにし、貯湯タンク２の中間位置からの出湯を優先し、貯湯タンク２の上部に貯められている高温水の使用を最小限に留め、熱源となる高温水をより多く確保することが可能となる。   Further, since the intermediate warm water mixing valve 30 supplies hot water having a temperature higher than a predetermined hot water supply temperature (first hot water supply set temperature) to the first hot water discharge pipe 31, the first intermediate warm water hot water outlet 34 is provided. When the temperature of the hot water discharged from the second intermediate hot water outlet 35 is lower than the hot water supply set temperature (first hot water supply set temperature), the mixing ratio of the intermediate hot water mixing valve 30 is controlled by the hot water supply control unit 55 as shown in FIG. Is adjusted so that hot water having a constant temperature higher than the hot water supply set temperature (first hot water set temperature) is supplied to the first hot water discharge pipe 31 using the high temperature water from the hot water discharge pipe 8, and the intermediate position of the hot water storage tank 2 Priority is given to the hot water from the hot water, the use of the high temperature water stored in the upper part of the hot water storage tank 2 is minimized, and more hot water as a heat source can be secured.

次に、図６に示す浴槽６への湯張り運転について説明すると、給湯リモコン５または風呂リモコン７の風呂自動スイッチ５３、５４の何れかが操作されると、給湯制御部５５が湯張り弁４６を開弁する。そして、給水管９からの給水が貯湯タンク２内に流れ込む。そしてこのとき、貯湯タンク２内の中温水温度センサ３６の位置には沸き上げられた高温水が貯められているので、中温水温度センサ３６は所定値以上の温度を検出し、給湯制御部５５によって中温水切換弁３３が下側の第１中温水出湯口３４側に切換えられて、第１中温水出湯口３４から中温水出湯管２９を介して中温水混合弁３０へ高温水が押し出される。   Next, the hot water filling operation to the bathtub 6 shown in FIG. 6 will be described. When any of the hot water remote control 5 or the bath automatic switches 53 and 54 of the bath remote control 7 is operated, the hot water supply control unit 55 makes the hot water filling valve 46. Open the valve. Then, the water supply from the water supply pipe 9 flows into the hot water storage tank 2. At this time, since the boiled high-temperature water is stored at the position of the medium temperature water temperature sensor 36 in the hot water storage tank 2, the medium temperature water temperature sensor 36 detects a temperature equal to or higher than a predetermined value, and the hot water supply control unit 55. As a result, the intermediate warm water switching valve 33 is switched to the lower first intermediate warm water outlet 34, and hot water is pushed out from the first intermediate warm water outlet 34 to the intermediate warm water mixing valve 30 through the intermediate warm water outlet pipe 29. .

ここで、給湯制御部５５は風呂自動スイッチ５３、５４の入力を受けると、中温水出湯管２９からの湯水と出湯管８からの湯水を混合して中温水混合弁３０にて給湯リモコン５または風呂リモコン７で設定された風呂設定温度（第２給湯設定温度）より一定温度以上高い温度となるように中温水混合弁３０を適当な比率に調整するようにしている。なお、ここでは、中温水出湯管２９から流入する湯が高温で風呂設定温度（第２給湯温度）より高い温度であるため、中温水混合弁３０の出湯管８側を閉じることとなる。   Here, upon receiving input from the automatic bath switches 53 and 54, the hot water supply control unit 55 mixes hot water from the intermediate hot water outlet pipe 29 and hot water from the outlet pipe 8, and uses the intermediate hot water mixing valve 30 to supply the hot water remote controller 5 or 5. The intermediate hot water mixing valve 30 is adjusted to an appropriate ratio so that the temperature is higher than a certain temperature by a bath set temperature (second hot water set temperature) set by the bath remote controller 7. Here, since the hot water flowing from the intermediate temperature hot water outlet pipe 29 is hot and higher than the bath set temperature (second hot water temperature), the outlet hot water pipe 8 side of the intermediate temperature water mixing valve 30 is closed.

そして、中温水混合弁３０から流出した湯は第１出湯管３１を介して第２出湯管４２へ出湯される。そして第２出湯管４２からの高温水は風呂混合弁（第２混合弁）４１へ流入し、第２バイパス管４３からの低温水と混合され、給湯制御部５５が風呂混合弁（第２混合弁）４１の混合比率を調整し、風呂設定温度（第２給湯設定温度）の湯が湯張り管４４から風呂循環回路２６を介して浴槽６へ湯張りされる。ここで、中温水温度センサ３６が所定値以下の温度を検出すると、図４で説明した給湯動作の場合と同じく給湯制御部５５が出湯口切換弁３３を上方の第２中温水出湯口３４側に切換え、第２中温水出湯口３４から高温水を出湯するようにしている。   The hot water flowing out from the intermediate hot water mixing valve 30 is discharged to the second hot water discharge pipe 42 via the first hot water discharge pipe 31. And the high temperature water from the 2nd hot water pipe 42 flows into the bath mixing valve (2nd mixing valve) 41, is mixed with the low temperature water from the 2nd bypass pipe 43, and the hot water supply control part 55 carries out the bath mixing valve (2nd mixing valve). The mixing ratio of the valve 41 is adjusted, and hot water at the bath setting temperature (second hot water supply setting temperature) is filled from the hot water filling tube 44 to the bathtub 6 through the bath circulation circuit 26. Here, when the medium hot water temperature sensor 36 detects a temperature equal to or lower than a predetermined value, the hot water supply control unit 55 moves the hot water outlet switching valve 33 to the upper side of the second intermediate hot water hot water outlet 34 as in the case of the hot water supply operation described in FIG. The hot water is discharged from the second intermediate hot water outlet 34.

そして、湯張り管４４途中に設けられた風呂流量カウンタ４７が所定の湯張り量をカウントすると給湯制御部５５が湯張り弁４６を閉弁して湯張り運転を終了し、中温水混合弁３０での任意の混合温度を給湯設定温度（第１給湯設定温度）よりも一定温度高い温度となるようにするものである。   Then, when a bath flow counter 47 provided in the middle of the hot water filling pipe 44 counts a predetermined hot water filling amount, the hot water supply control unit 55 closes the hot water filling valve 46 and ends the hot water filling operation. Is set to a temperature that is higher by a certain temperature than the hot water supply set temperature (first hot water supply set temperature).

次に、図７に示す風呂の保温運転あるいは追焚き運転について説明すると、前記の浴槽６への湯張り運転に引き続き、給湯制御部５５は一定時間毎に風呂循環ポンプ２７を駆動し、浴槽６内の湯温を風呂温度センサ２８により検出する。そして風呂温度センサ２８の検出する温度が風呂設定温度（第２給湯設定温度）より所定値以上低下していると、給湯制御部５５は熱交循環ポンプ２３および風呂循環ポンプ２６を駆動開始し、高温水往き管２０から取り出した高温水を熱交換器１９に流入させ、二次側の浴槽水と熱交換させ風呂の保温運転あるいは追焚き運転を行う。そして、熱交換により温度低下した中温水が中温水戻り管２１を介して貯湯タンク２下部に戻り、高温水と入れ替わる形で高温水と中温水の境界面を押し上げるようにして中温水が貯湯されるものである。なお、貯湯タンク２内には上部に高温水、中間部に中温水、下部に低温水が貯められているが、その温度差が２０℃程度あれば比重差が発生し、温度境界層を形成して比重の軽い高温水が上部に、中間の中間水が中間部に、比重の重い低温水が下部に位置するので、互いに混じり合うことはないものである。   Next, the heat insulation operation or reheating operation of the bath shown in FIG. 7 will be described. Following the hot water filling operation to the bathtub 6, the hot water supply control unit 55 drives the bath circulation pump 27 at regular intervals, and the bathtub 6 The bath temperature sensor 28 detects the hot water temperature inside. When the temperature detected by the bath temperature sensor 28 is lower than the bath set temperature (second hot water supply set temperature) by a predetermined value or more, the hot water supply control unit 55 starts driving the heat exchange circulation pump 23 and the bath circulation pump 26. The hot water taken out from the hot water outlet pipe 20 is caused to flow into the heat exchanger 19 to exchange heat with the secondary-side bathtub water, and the bath is kept warm or operated. Then, the intermediate temperature water whose temperature has decreased due to the heat exchange returns to the lower part of the hot water storage tank 2 via the intermediate temperature water return pipe 21 and the hot water is stored in such a way as to push up the boundary surface between the high temperature water and the intermediate temperature water. Is. In the hot water storage tank 2, high temperature water is stored in the upper part, medium temperature water is stored in the middle part, and low temperature water is stored in the lower part. If the temperature difference is about 20 ° C, a specific gravity difference occurs and a temperature boundary layer is formed. Since the high-temperature water having a low specific gravity is located at the upper part, the intermediate intermediate water is located at the intermediate part, and the low-temperature water having a high specific gravity is located at the lower part, they are not mixed with each other.

そして、二次側では、熱交換器１９にて加熱された浴槽水が浴槽６へ戻って浴槽６内を昇温し、風呂温度センサ２８で検出する温度が風呂設定温度（第２給湯設定温度）に達すると、給湯制御部５５は熱交循環ポンプ２３および風呂循環ポンプ２６を駆動停止して保温運転あるいは追焚き運転を停止する。   On the secondary side, the bathtub water heated by the heat exchanger 19 returns to the bathtub 6 to raise the temperature in the bathtub 6, and the temperature detected by the bath temperature sensor 28 is the bath set temperature (second hot water set temperature). ), The hot water supply control unit 55 stops driving the heat exchange circulation pump 23 and the bath circulation pump 26 to stop the heat insulation operation or the chasing operation.

次に、貯湯タンク２内に中温水が貯められた後の給湯運転について説明する。図８に示すように、第１中温水出湯口３４付近に中温水が貯められて中温水温度センサ３６が中温水を検出している場合は、出湯口切換弁３３は第１中温水出湯口３４側に切換えられ、給湯混合水栓３の開栓により、給水管９からの給水が貯湯タンク２内に流れ込むと同時に、第１中温水出湯口３４から中温水が押し出されて中温水出湯管２９を介して中温水混合弁３０へ流入する。   Next, a hot water supply operation after intermediate hot water is stored in the hot water storage tank 2 will be described. As shown in FIG. 8, when intermediate warm water is stored near the first intermediate warm water outlet 34 and the intermediate warm water temperature sensor 36 detects intermediate warm water, the outlet switching valve 33 is set to the first intermediate warm water outlet. When the hot water supply mixing tap 3 is opened, the water supply from the water supply pipe 9 flows into the hot water storage tank 2 and at the same time, the intermediate hot water is pushed out from the first intermediate hot water outlet 34 and the intermediate hot water outlet pipe. It flows into the warm water mixing valve 30 through 29.

ここで、第１中温水出湯口３４から押し出される湯水の温度が給湯設定温度（第１給湯設定温度）よりも低い場合は、中温水混合弁３０の混合比率が調整されて貯湯タンク２上端部の出湯管８からの高温水と混合されて給湯設定温度より一定温度高い温度の湯を供給するようにしている。   Here, when the temperature of the hot water pushed out from the first intermediate hot water outlet 34 is lower than the hot water supply set temperature (first hot water supply set temperature), the mixing ratio of the intermediate hot water mixing valve 30 is adjusted and the upper end of the hot water storage tank 2 is adjusted. The hot water is mixed with the hot water from the hot water discharge pipe 8 and supplied at a temperature higher than the preset hot water supply temperature.

そして、中温水混合弁３０から流出した湯は第１出湯管３１を介して給湯混合弁（第１混合弁）３６へ流入し、第１バイパス管３８からの低温水と混合され、給湯制御部５５が給湯混合弁（第１混合弁）３６の混合比率を調整し給湯設定温度（第１給湯設定温度）の湯が給湯栓４から給湯される。そして、給湯栓４の閉止によって給湯が終了するものである。   And the hot water which flowed out from the intermediate temperature water mixing valve 30 flows into the hot water supply mixing valve (first mixing valve) 36 through the first hot water discharge pipe 31, and is mixed with the low temperature water from the first bypass pipe 38, and the hot water supply control section. 55 adjusts the mixing ratio of the hot water supply mixing valve (first mixing valve) 36, and hot water at a hot water supply set temperature (first hot water set temperature) is supplied from the hot water tap 4. Then, the hot water supply is completed by closing the hot water tap 4.

ここで、中温水温度センサ３６が所定値以下の温度を検出すると、図９に示すように、給湯制御部５５が出湯口切換弁３３を上側の第２中温水出湯口３５側に切換え、第２中温水出湯口３５から高温水を出湯するようにしている。よって、下側の第１中温水出湯口３４付近に高温水あるいは中温水が貯められている場合には第１中温水出湯口３４から出湯し、第１中温水出湯口３４付近に給水管９からの低温水が貯められている場合は第２中温水出湯口３５から出湯されることとなり、貯湯タンク２内の中温水を余すことなく給湯に用いることが可能となるものである。   Here, when the medium hot water temperature sensor 36 detects a temperature equal to or lower than a predetermined value, the hot water supply control unit 55 switches the hot water outlet switching valve 33 to the upper second intermediate hot water hot water outlet 35 side, as shown in FIG. 2. Hot water is discharged from the medium hot water outlet 35. Therefore, when high temperature water or medium temperature water is stored near the lower first intermediate hot water outlet 34, hot water is discharged from the first intermediate hot water outlet 34, and the water supply pipe 9 is provided near the first intermediate hot water outlet 34. When the low-temperature water from the hot water is stored, the hot water is discharged from the second intermediate hot water outlet 35, and the hot water in the hot water storage tank 2 can be used for hot water supply without being left over.

また、前記中温水混合弁３０は給湯設定温度（第１給湯設定温度）よりも一定温度以上高い温度の湯を第１出湯管３１に供給するようにしているので、第１中温水出湯口３４および第２中温水出湯口３５から出湯する湯水の温度が給湯設定温度（第１給湯設定温度）よりも低い場合は、給湯制御部５５により中温水混合弁３０の混合比率が調整されて出湯管８からの高温水を用いて給湯設定温度（第１給湯設定温度）よりも一定温度高い温度の湯を第１出湯管３１に供給するようにし、貯湯タンク２の中間位置からの出湯を優先し、貯湯タンク２の上部に貯められている高温水の使用を最小限に留め、熱源となる高温水をより多く確保することが可能となる。   Further, since the intermediate warm water mixing valve 30 supplies hot water having a temperature higher than a predetermined hot water supply temperature (first hot water supply set temperature) to the first hot water discharge pipe 31, the first intermediate warm water hot water outlet 34 is provided. When the temperature of the hot water discharged from the second intermediate hot water outlet 35 is lower than the hot water supply set temperature (first hot water set temperature), the mixing ratio of the intermediate hot water mixing valve 30 is adjusted by the hot water control unit 55 and the hot water pipe Hot water at a constant temperature higher than the hot water supply set temperature (first hot water set temperature) is supplied to the first hot water discharge pipe 31 using the high temperature water from 8, and the hot water from the intermediate position of the hot water storage tank 2 is given priority. It is possible to minimize the use of high-temperature water stored in the upper part of the hot water storage tank 2 and to secure more high-temperature water as a heat source.

次に、図１０に示す給湯動作中に湯張り運転が開始されるかまたは湯張り運転中に給湯動作が開始される同時給湯時は、給湯制御部５５が給湯設定温度（第１給湯設定温度）と風呂設定温度（第２給湯設定温度）を比較し、高い方の温度よりも一定温度高い温度を中温水混合弁３０での任意の所定温度とするようにしている。   Next, when the hot water filling operation is started during the hot water supply operation shown in FIG. 10 or the hot water supply operation is started during the hot water filling operation, the hot water supply control unit 55 performs the hot water supply set temperature (first hot water supply set temperature). ) And the bath set temperature (second hot water supply set temperature), and a temperature higher than the higher temperature by a certain temperature is set as an arbitrary predetermined temperature in the intermediate temperature water mixing valve 30.

このように、その時々の任意の給湯設定温度に応じて熱源として利用した中温水を可能な限り多く使って給湯を行うことができ、給湯が行われていない側の給湯設定温度が高い場合であっても、中温水混合弁で混合される任意の所定温度を、給湯設定温度の実際に給湯されている側の給湯設定温度よりも一定温度高い温度としているので、中温水を可能な限り多く使って給湯を行うことができると共に、複数の給湯端から同時給湯の要求がある時であっても、中温水混合弁３０が高い方の設定温度よりも一定温度高い温度の湯を出湯するので、中温水を有効に使いつつ各々の設定温度の湯を同時に給湯できるもので、熱源となる高温水を無駄に使用することを抑制して熱源としての能力を多く確保できるものである。   In this way, hot water can be supplied using as much hot water as possible as the heat source according to any hot water set temperature at that time, and the hot water set temperature on the side where hot water is not supplied is high Even if it exists, since the arbitrary predetermined temperature mixed with the intermediate temperature water mixing valve is set to a constant temperature higher than the hot water supply set temperature on the side where the hot water supply temperature is actually supplied, the amount of intermediate temperature water is increased as much as possible. Since hot water can be used, and even when there is a need for simultaneous hot water supply from a plurality of hot water supply ends, the hot water mixing valve 30 discharges hot water at a constant temperature higher than the higher set temperature. In addition, hot water of each set temperature can be simultaneously supplied while effectively using medium temperature water, and use of high temperature water as a heat source can be suppressed, and a large capacity as a heat source can be secured.

なお、前記中温水戻り管２１は貯湯タンク２最下端の給水管９および下部のヒーポン往き管１０よりも高い位置に接続されているため、貯湯タンク２内に熱源として使われた中温水が戻されても、給湯の使用により貯湯タンク２下端から給水管からの低温水が流入することで貯湯タンク２の最下端には低温水が確保されることとなり、次回の沸き上げの際には必ず低温水から沸き上げることができるという効果がある。   The intermediate hot water return pipe 21 is connected to a position higher than the water supply pipe 9 at the lowermost end of the hot water storage tank 2 and the lower heat pump forward pipe 10, so that the intermediate hot water used as a heat source is returned to the hot water storage tank 2. Even if the hot water is used, low temperature water flows from the lower end of the hot water storage tank 2 and the low temperature water is secured at the lowermost end of the hot water storage tank 2. There is an effect that it can be boiled from low-temperature water.

また、第１中温水出湯口３４および第２中温水出湯口３５が中温水戻り管２１よりも高い位置に設けられているので、中温水戻り管２１と第１中温水出湯口３４および第２中温水出湯口３５との間にある程度の容量を確保でき、熱交換器１９で温度低下した中温水をその容量分だけ一時的に貯めておくことができることとなり、中温水出湯管２９から出湯させることができない中温水を極力少なくすることができるもので、しかも、第１中温水取出し口３４及び第２中温水取出し口３５を上下に設けているため、下側の第１中温水取出し口３４よりも上に中温水が貯められても、上側の第２中温水取出し口３５で中温水を出湯させることができ、熱源として利用されてできた中温水を貯湯タンク２内に無駄に貯めてしまうことなく給湯に有効に利用することができる。   Further, since the first intermediate warm water outlet 34 and the second intermediate warm water outlet 35 are provided at a position higher than the intermediate warm water return pipe 21, the intermediate warm water return pipe 21, the first intermediate warm water outlet 34, and the second A certain amount of capacity can be secured between the hot water outlet 35 and the hot water whose temperature has been lowered by the heat exchanger 19 can be temporarily stored by that capacity, and the hot water is discharged from the hot water outlet pipe 29. The medium temperature water that cannot be reduced can be reduced as much as possible. Moreover, since the first medium temperature water outlet 34 and the second medium temperature water outlet 35 are provided vertically, the lower first medium temperature water outlet 34 is provided. Even if the intermediate warm water is stored above, the intermediate warm water can be discharged from the upper second intermediate warm water outlet 35, and the intermediate warm water used as a heat source is wasted in the hot water storage tank 2. Effective for hot water supply It can be used.

ここで、もし中温水戻り管２１と第１中温水出湯口３４または第２中温水出湯口３５とが同じ高さにあった場合には、中温水が中温水戻り管２１より高い位置に貯められてしまう場合があり、これを中温水戻り管２１と同じ高さにある第１中温水出湯口３４または第２中温水出湯口３５から取り出すことができないため、中温水が発生すると全く同時にこの中温水を給湯に用いる必要があり、さもなければ多量に給湯を行って中温水が貯湯タンク２上端部に接続された出湯管８にまで押し上げられるまで貯湯タンク２内に中温水が貯湯されてしまうこととなる。しかし、この一実施形態では上記のように中温水戻り管２１よりも高い位置に第１中温水出湯口３４または第２中温水出湯口３５が設けられているため、この高さの差分の容量だけ中温水の発生から利用までの容量的あるいは時間的余裕ができ、中温水をある程度の容量分発生させてから時間的間隔をおいて給湯を行っても中温水を給湯に用いることができる効果がある。   Here, if the intermediate warm water return pipe 21 and the first intermediate warm water outlet 34 or the second intermediate warm water outlet 35 are at the same height, the intermediate warm water is stored at a higher position than the intermediate warm water return pipe 21. Since this cannot be taken out from the first intermediate hot water outlet 34 or the second intermediate hot water outlet 35 that is at the same height as the intermediate hot water return pipe 21, the intermediate hot water is generated at the same time. It is necessary to use medium-temperature water for hot water supply, otherwise hot water is stored in the hot water storage tank 2 until hot water is supplied and the hot water is pushed up to the hot water discharge pipe 8 connected to the upper end of the hot water storage tank 2. It will end up. However, in this embodiment, since the first intermediate hot water outlet 34 or the second intermediate hot water outlet 35 is provided at a position higher than the intermediate warm water return pipe 21 as described above, the difference capacity of this height is provided. The effect of being able to use medium-temperature water for hot water supply even if hot water is supplied at a time interval after generating a certain volume of medium-temperature water from the generation or use of medium-temperature water. There is.

このように、給湯の際に熱源として利用された中温水を高温水よりも優先して貯湯タンク２の途中から取り出して給湯するので、高温水を給湯しきるまで中温水を給湯できないと行った不具合がなく、給湯を行う度に貯湯タンク２内の中温水が減って給水管９からの低温水に入れ替わって、深夜の沸き上げ動作を行う時には沸き上げ効率の悪い中温水ではなく、温度の低い低温水をヒートポンプ回路１６で沸き上げることとなり、沸き上げの効率が向上しヒートポンプ式給湯装置としてのＣＯＰ（エネルギー消費効率）が良くなるものである。   Thus, since the hot water used as a heat source during hot water supply is taken out from the hot water storage tank 2 in preference to the hot water and hot water is supplied, the hot water cannot be supplied until the hot water is fully supplied. Whenever hot water is supplied, the medium temperature water in the hot water storage tank 2 decreases and is replaced with the low temperature water from the water supply pipe 9, and when performing a boiling operation at midnight, the temperature is not low but the temperature is not low. The low-temperature water is boiled by the heat pump circuit 16, which improves the boiling efficiency and improves the COP (energy consumption efficiency) as the heat pump type hot water supply apparatus.

次に図３〜図５および図８〜図１０に示すように給湯中に給湯混合弁（第１混合弁）３７が高温側でロックし故障した場合では、図１１のフローチャートに示す如く、ステップ６０で給湯温度センサ４０の検出する給湯温度が、給湯設定温度（第１給湯設定温度）＋３℃以上かを判断し、ＹＥＳではステップ６１に進み誤検知防止の為に、これが５秒以上継続したかを判断して、ＹＥＳで給湯混合弁（第１混合弁）３７が高温側で故障したとして、給湯制御部５５が給湯混合弁３７の高温側故障エラーを出力することにより、ステップ６２に進んで各リモコン５、７に給湯混合弁３７の高温側故障エラーを表示させ、そしてステップ６３に進んで中温水混合弁３０を出湯管８側を絞り中温水出湯管２９側を優先させて固定制御を行い、火傷の危険がなく中温水も多く出湯出来、しかもＣＯＰ（エネルギー消費効率）も図ることが出来るものである。   Next, as shown in FIGS. 3 to 5 and FIGS. 8 to 10, when the hot water supply mixing valve (first mixing valve) 37 is locked on the high temperature side and fails during hot water supply, as shown in the flowchart of FIG. At 60, it is determined whether the hot water temperature detected by the hot water temperature sensor 40 is equal to or higher than the hot water supply set temperature (first hot water set temperature) + 3 ° C. If YES, the process proceeds to step 61, and this continues for 5 seconds or more to prevent false detection. If it is determined that the hot water supply mixing valve (first mixing valve) 37 has failed on the high temperature side and the hot water supply control unit 55 outputs a high temperature side failure error of the hot water mixing valve 37, the process proceeds to step 62. In step 63, the remote controller 5 and 7 display a hot water side failure error of the hot water mixing valve 37, and the process proceeds to step 63 where the intermediate hot water mixing valve 30 is squeezed on the side of the hot water outlet 8 and fixed control is given priority on the intermediate hot water hot water outlet pipe 29 side. Of burns Ken warm water many can pouring in without, moreover COP (energy consumption efficiency) is also one in which it can be achieved.

更に給湯混合弁（第１混合弁）３７が高温側でロックし故障した場合では、ステップ６０でＮＯとなり、ステップ６４に進み給湯設定温度（第１給湯設定温度）−３℃以下かを判断し、ＹＥＳではステップ６５に進み同じく誤検知防止用に、これが５秒以上継続したかを判断して、ＹＥＳで給湯混合弁（第１混合弁）３７が低温側で故障したとして、給湯制御部５５が給湯混合弁３７の低温側故障エラーを出力することにより、ステップ６６に進んで各リモコン５、７に給湯混合弁３７の低温側故障エラー表示のみ行わせるものであり、低温側では火傷の危険がないのでエラー表示のみで、中温水混合弁３０の固定制御は行わず通常の制御としているものである。   Further, if the hot water supply mixing valve (first mixing valve) 37 is locked on the high temperature side and fails, NO is determined in step 60, and the process proceeds to step 64 to determine whether the hot water supply set temperature (first hot water set temperature) is −3 ° C. or less. If YES, the process proceeds to step 65, and it is determined whether this has continued for 5 seconds or more, and if YES, it is determined that the hot water supply mixing valve (first mixing valve) 37 has failed on the low temperature side. Outputs the low temperature side failure error of the hot water supply mixing valve 37, and proceeds to step 66 to cause each of the remote controllers 5 and 7 to display only the low temperature side failure error of the hot water supply mixing valve 37. On the low temperature side, there is a risk of burns. Since there is no error, only the error display is performed, and the fixed control of the intermediate hot water mixing valve 30 is not performed and the normal control is performed.

次に図６と図１０に示すように風呂の湯張り中に風呂混合弁（第２混合弁）４１が高温側でロックし故障した場合では、図１２のフローチャートに示す如く、ステップ６７で湯張り温度センサ４５の検出する湯張り温度が、風呂設定温度（第２給湯設定温度）＋３℃以上かを判断し、ＹＥＳではステップ６８に進み誤検知防止の為に、これが５秒以上継続したかを判断して、ＹＥＳで風呂混合弁（第２混合弁）４１が高温側で故障したとして、給湯制御部５５が風呂混合弁４１の高温側故障エラーを出力することにより、ステップ６９に進んで各リモコン５、７に風呂混合弁４１の高温側故障エラーを表示させ、そしてステップ７０に進んで中温水混合弁３０を出湯管８側を絞り中温水出湯管２９側を優先させて固定制御を行い、火傷の危険がなく中温水も多く出湯出来、しかもＣＯＰ（エネルギー消費効率）も図ることが出来るものである。   Next, as shown in FIGS. 6 and 10, when the bath mixing valve (second mixing valve) 41 is locked on the high temperature side and malfunctions during bath filling, as shown in the flowchart of FIG. It is determined whether the hot water temperature detected by the hot water temperature sensor 45 is higher than the bath set temperature (second hot water supply set temperature) + 3 ° C. If YES, the process proceeds to step 68, and is this continued for 5 seconds or longer to prevent false detection? If the bath mixing valve (second mixing valve) 41 has failed on the high temperature side and the hot water supply control unit 55 outputs a high temperature side failure error of the bath mixing valve 41, the process proceeds to step 69. The remote controller 5 or 7 displays a high-temperature failure error of the bath mixing valve 41, and proceeds to step 70 to squeeze the hot water mixing valve 30 on the side of the hot water pipe 8 and give priority to the hot water hot water outlet pipe 29 side for fixed control. Danger of burns done Hot water many can pouring in without, moreover COP (energy consumption efficiency) is also one in which it can be achieved.

更に風呂混合弁（第２混合弁）４１が高温側でロックし故障した場合では、ステップ６７でＮＯとなり、ステップ７１に進み風呂設定温度（第２給湯設定温度）−３℃以下かを判断し、ＹＥＳではステップ７２に進み同じく誤検知防止用に、これが５秒以上継続したかを判断して、ＹＥＳで風呂混合弁（第２混合弁）４１が低温側で故障したとして、給湯制御部５５が風呂混合弁４１の低温側故障エラーを出力することにより、ステップ７３に進んで各リモコン５、７に風呂混合弁４１の低温側故障エラー表示のみ行わせるものであり、低温側では火傷の危険がないのでエラー表示のみで、中温水混合弁３０の固定制御は行わず通常の制御としているものである。   Further, when the bath mixing valve (second mixing valve) 41 is locked on the high temperature side and fails, NO is determined in step 67, and the flow proceeds to step 71 to determine whether the bath set temperature (second hot water supply set temperature) is −3 ° C. or less. If YES, the process proceeds to step 72, and it is determined whether this has continued for 5 seconds or more to prevent erroneous detection. If YES, it is determined that the bath mixing valve (second mixing valve) 41 has failed on the low temperature side. Outputs the low temperature side failure error of the bath mixing valve 41, and proceeds to step 73 to cause each of the remote controllers 5 and 7 to display only the low temperature side failure error of the bath mixing valve 41. On the low temperature side, there is a risk of burns. Since there is no error, only the error display is performed, and the fixed control of the intermediate hot water mixing valve 30 is not performed and the normal control is performed.

次に図１３と図１４のフローチャートに示す他の実施形態について説明するが、図１１と図１２との同一部分には同じ符号を付して説明も省略し、相違部分のみ説明すると、最後のステップ７４で、中温水混合弁３０を出湯管８側を閉塞し中温水出湯管２９側を全開にして固定するように給湯制御部５５が制御し、給湯混合弁（第１混合弁）３７或いは風呂混合弁（第２混合弁）４１とが高温側で故障した場合には、完全に高温水側を閉じて中温水のみとして確実に火傷の危険を回避して、使い勝手より安全性を重視するようにしたものである。   Next, other embodiments shown in the flowcharts of FIGS. 13 and 14 will be described. However, the same parts in FIGS. 11 and 12 are denoted by the same reference numerals and description thereof is omitted, and only the different parts will be described. In step 74, the hot water supply control unit 55 controls the hot water mixing valve 30 so as to close the hot water discharge pipe 8 side and fix the intermediate hot water hot water discharge pipe 29 side fully open, and the hot water supply mixing valve (first mixing valve) 37 or If the bath mixing valve (second mixing valve) 41 breaks down on the high temperature side, the hot water side is completely closed and only the medium temperature water is used to reliably avoid the risk of burns, placing importance on safety over ease of use. It is what I did.

なお、この一実施形態では、熱交換器１９と熱交循環ポンプ２３と風呂循環ポンプ２７とを貯湯タンクユニット１内に設けているが、貯湯タンクユニット１とは別体のユニット体に設けるようにしても良く、本発明の要旨を変更しない範囲での実施形態の変更をすることを妨げるものではない。   In this embodiment, the heat exchanger 19, the heat exchange circulation pump 23, and the bath circulation pump 27 are provided in the hot water storage tank unit 1, but are provided in a separate unit body from the hot water storage tank unit 1. However, it does not preclude changing the embodiment without changing the gist of the present invention.

また、この一実施形態では、熱交換器１９の二次側に風呂循環回路２６を設けているが、床暖房パネルや温水式温風暖房器や温水式パネルコンベクタ、温水式パネルラジエータ等の暖房循環回路を設けても良く、要は貯湯タンク１６内の高温水の熱を熱交換器１９で熱交換して利用する熱機器であれば何でも良いものである。   In this embodiment, a bath circulation circuit 26 is provided on the secondary side of the heat exchanger 19, but a floor heating panel, a hot water hot air heater, a hot water panel convector, a hot water panel radiator, etc. A heating circulation circuit may be provided. In short, any heat equipment that uses heat of the hot water in the hot water storage tank 16 by exchanging heat with the heat exchanger 19 may be used.

さらに、貯湯タンク２内の湯水を加熱する手段としてヒートポンプ回路１６を例示しているが、これに限られず、貯湯タンク２内に直接配置した電熱ヒータや、貯湯タンク２内の湯水を循環させて電熱ヒータで加熱するようにしても良いものである。   Furthermore, although the heat pump circuit 16 is illustrated as a means for heating the hot water in the hot water storage tank 2, the heat pump circuit 16 is not limited to this, and an electric heater directly disposed in the hot water storage tank 2 or hot water in the hot water storage tank 2 is circulated. Heating may be performed with an electric heater.

この発明の一実施形態の概略構成図。The schematic block diagram of one Embodiment of this invention. 同一実施形態の沸き上げ運転の作動を説明する図。The figure explaining the action | operation of the boiling operation of the same embodiment. 同一実施形態の給湯運転の作動を説明する図。The figure explaining the action | operation of the hot water supply driving | operation of the same embodiment. 同一実施形態の給湯運転の作動を説明する図。The figure explaining the action | operation of the hot water supply driving | operation of the same embodiment. 同一実施形態の給湯運転の作動を説明する図。The figure explaining the action | operation of the hot water supply driving | operation of the same embodiment. 同一実施形態の湯張り運転の作動を説明する図。The figure explaining the action | operation of the filling operation of the same embodiment. 同一実施形態の保温／追焚き運転の作動を説明する図。The figure explaining the action | operation of the heat retention / chase operation of the same embodiment. 同一実施形態の貯湯タンク内に中温水が存在する場合の給湯運転の作動を説明する図。The figure explaining the action | operation of the hot water supply driving | running | working in case medium temperature water exists in the hot water storage tank of the same embodiment. 同一実施形態の貯湯タンク内に中温水が存在する場合の給湯運転の作動を説明する図。The figure explaining the action | operation of the hot water supply driving | running | working in case medium temperature water exists in the hot water storage tank of the same embodiment. 同一実施形態の貯湯タンク内に中温水が存在する場合の給湯／湯張り同時運転の作動を説明する図。The figure explaining the action | operation of the hot water supply / hot water filling simultaneous operation in case medium temperature water exists in the hot water storage tank of the same embodiment. 同一実施形態の給湯運転中に給湯混合弁（第１混合弁）が故障した時のフローチャート。The flowchart when the hot water supply mixing valve (1st mixing valve) fails during the hot water supply operation of the same embodiment. 同一実施形態の風呂運転中に風呂混合弁（第２混合弁）が故障した時のフローチャート。The flowchart when a bath mixing valve (2nd mixing valve) fails during the bath operation of the same embodiment. 他の実施形態の給湯運転中に給湯混合弁（第１混合弁）が故障した時のフローチャート。The flowchart when the hot water supply mixing valve (1st mixing valve) fails during the hot water supply driving | operation of other embodiment. 他の実施形態の風呂運転中に風呂混合弁（第２混合弁）が故障した時のフローチャート。The flowchart when a bath mixing valve (2nd mixing valve) fails during the bath operation of other embodiment.

符号の説明Explanation of symbols

２ 貯湯タンク
４ 給湯栓（第１給湯端）
８ 出湯管
９ 給水管
１６ ヒートポンプ回路（加熱手段）
２９ 中温水出湯管
３０ 中温水混合弁
３７ 給湯混合弁（第１混合弁）
３８ 第１バイパス管
４１ 風呂混合弁（第２混合弁）
４３ 第２バイパス管
４４ 湯張り管（第２給湯端） 2 Hot water storage tank 4 Hot water tap (first hot water supply end)
8 Hot water pipe 9 Water supply pipe 16 Heat pump circuit (heating means)
29 Medium-temperature water tap pipe 30 Medium-temperature water mixing valve 37 Hot-water supply mixing valve (first mixing valve)
38 First bypass pipe 41 Bath mixing valve (second mixing valve)
43 Second bypass pipe 44 Hot water filling pipe (second hot water supply end)

Claims (2)

給水管が下端部に接続されていると共に貯湯している高温水を流出させる出湯管が上端部に接続されている貯湯タンクと、この貯湯タンク内の湯水を高温に加熱する加熱手段と、熱交換により生成された中温水を前記貯湯タンクから流出させるための中温水出湯管と、前記出湯管からの高温水と前記中温水出湯管からの中温水を任意の所定温度に混合する中温水混合弁と、前記中温水混合弁で混合された湯と前記給水管から分岐された第１バイパス管からの低温水とを任意の第１給湯設定温度に混合して第１給湯端から給湯させる第１混合弁と、前記中温水混合弁で混合された湯と前記給水管から分岐された第２バイパス管からの低温水とを任意の第２給湯設定温度に混合して第２給湯端から給湯させる第２混合弁とを備えたものに於いて、前記第１混合弁或いは第２混合弁の少なくてもどちらか一方の低温側での故障では、通常の制御とし、高温側での故障では、中温水混合弁を出湯管側を絞り中温水出湯管側を優先の制御とした事を特徴とする貯湯式給湯装置。 A hot water storage tank having a hot water tank connected to the upper end, a hot water storage tank connected to the lower end of the hot water stored in the hot water, and a heating means for heating the hot water in the hot water storage tank to a high temperature. Intermediate temperature water mixing pipe for mixing medium temperature water from the hot water storage tank, high temperature water from the discharge pipe and medium temperature water from the intermediate temperature water discharge pipe to any given temperature A hot water mixed by the valve, the hot water mixing valve and the low-temperature water from the first bypass pipe branched from the water supply pipe are mixed at an arbitrary first hot water supply set temperature to supply hot water from the first hot water supply end. 1 mixing valve, hot water mixed by the intermediate temperature water mixing valve and low temperature water from the second bypass pipe branched from the water supply pipe are mixed at an arbitrary second hot water supply set temperature to supply hot water from the second hot water supply end. With a second mixing valve Serial The failure of the first mixing valve or fewer or either the low temperature side of the second mixing valve, with a normal control, the failure of the high-temperature side, the hot water tapping in squeezing the hot water pipe side medium hot water mixing valve Hot water storage hot water supply system characterized by priority control on the pipe side. 給水管が下端部に接続されていると共に貯湯している高温水を流出させる出湯管が上端部に接続されている貯湯タンクと、この貯湯タンク内の湯水を高温に加熱する加熱手段と、熱交換により生成された中温水を前記貯湯タンクから流出させるための中温水出湯管と、前記出湯管からの高温水と前記中温水出湯管からの中温水を任意の所定温度に混合する中温水混合弁と、前記中温水混合弁で混合された湯と前記給水管から分岐された第１バイパス管からの低温水とを任意の第１給湯設定温度に混合して第１給湯端から給湯させる第１混合弁と、前記中温水混合弁で混合された湯と前記給水管から分岐された第２バイパス管からの低温水とを任意の第２給湯設定温度に混合して第２給湯端から給湯させる第２混合弁とを備えたものに於いて、前記第１混合弁或いは第２混合弁の少なくてもどちらか一方の低温側での故障では、通常の制御とし、高温側での故障では、中温水混合弁を出湯管側閉塞で中温水出湯管側全開とした事を特徴とする貯湯式給湯装置。 A hot water storage tank having a hot water tank connected to the upper end, a hot water storage tank connected to the lower end of the hot water stored in the hot water, and a heating means for heating the hot water in the hot water storage tank to a high temperature. Intermediate temperature water mixing pipe for mixing medium temperature water from the hot water storage tank, high temperature water from the discharge pipe and medium temperature water from the intermediate temperature water discharge pipe to any given temperature A hot water mixed by the valve, the hot water mixing valve and the low-temperature water from the first bypass pipe branched from the water supply pipe are mixed at an arbitrary first hot water supply set temperature to supply hot water from the first hot water supply end. 1 mixing valve, hot water mixed by the intermediate temperature water mixing valve and low temperature water from the second bypass pipe branched from the water supply pipe are mixed at an arbitrary second hot water supply set temperature to supply hot water from the second hot water supply end. With a second mixing valve Serial The failure of the first mixing valve or fewer or either the low temperature side of the second mixing valve, with a normal control, the failure of the high-temperature side, medium-temperature water tapping the medium-temperature water mixing valve in hot water tube occlusion Hot water storage type hot water supply device characterized by the tube side being fully open.
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