JP6045451B2

JP6045451B2 - Hot water storage hot water bath equipment

Info

Publication number: JP6045451B2
Application number: JP2013145344A
Authority: JP
Inventors: 広記窪田; 基阿部
Original assignee: Corona Corp
Current assignee: Corona Corp
Priority date: 2013-07-11
Filing date: 2013-07-11
Publication date: 2016-12-14
Anticipated expiration: 2033-07-11
Also published as: JP2015017756A

Description

この発明は、貯湯式給湯風呂装置の凍結予防に関するものである。 The present invention relates to freezing prevention of a hot water storage type hot water bath apparatus.

従来この種の貯湯式給湯風呂装置においては、浴槽水を循環させる風呂循環回路に、貯湯タンク内に設けられた風呂熱交換器を接続し、貯湯タンク内の温水を利用して浴槽水の追い焚きや保温をできるようにし、この風呂循環回路に風呂熱交換器をバイパスして浴槽水を循環させるバイパス管と流路切換手段を設け、冬季等に、外気温度センサで検出される外気温度が低く浴槽水が凍結するおそれがある場合、流路切換手段をバイパス管側に切り換え、風呂循環回路に設けられた風呂循環ポンプを駆動させて浴槽水を循環させることで、風呂循環回路の凍結を予防する風呂凍結予防運転を行うようにしたものがあった（特許文献１）。このものでは、風呂凍結予防運転の際、風呂循環回路を循環する浴槽水の放熱により、貯湯タンクユニット内の雰囲気温度が上昇するため、貯湯タンクユニット内の配管や主要部品に対する凍結予防にもなるものであった。 Conventionally, in this type of hot water storage hot water bath system, a bath heat exchanger provided in the hot water storage tank is connected to a bath circulation circuit for circulating the bath water, and the hot water in the hot water storage tank is used to replenish the bath water. This bath circulation circuit is provided with a bypass pipe that circulates the bath water by bypassing the bath heat exchanger and a flow path switching means in this bath circulation circuit, and the outdoor temperature detected by the outdoor temperature sensor in winter etc. If there is a risk that the bath water will freeze, switch the flow path switching means to the bypass pipe side and drive the bath circulation pump provided in the bath circulation circuit to circulate the bath water, thereby freezing the bath circulation circuit. There was a bath freezing prevention operation to prevent (Patent Document 1). In this case, during bath freeze prevention operation, the atmosphere temperature in the hot water tank unit rises due to the heat radiation of the bathtub water circulating in the bath circulation circuit, so it also prevents freezing of piping and main parts in the hot water tank unit It was a thing.

また、従来この種の貯湯式給湯風呂装置においては、冬季等に、外気温度センサで検出される外気温度が低く、かつ、貯湯温度センサで検出される貯湯タンク内の湯水の温度が低くなった場合に、貯湯タンク内の湯水を沸き上げる凍結予防沸上運転を行うものがあった（特許文献２）。このものでは、凍結予防沸上運転により貯湯タンク内に高温の湯を貯めることで、貯湯タンクユニット内の雰囲気温度が上昇するため、貯湯タンクユニット内の配管や主要部品の凍結を予防できるものであった。 In addition, in this type of hot water storage hot water bath apparatus, the temperature of the outside air detected by the outside air temperature sensor is low and the temperature of the hot water in the hot water storage tank detected by the hot water temperature sensor is low in winter. In some cases, there has been a freeze prevention boiling operation for boiling hot water in a hot water storage tank (Patent Document 2). In this product, hot water is stored in the hot water storage tank by freezing prevention boiling operation, and the atmospheric temperature in the hot water storage tank unit rises. Therefore, freezing of piping and main parts in the hot water storage tank unit can be prevented. there were.

特開２００３−１４８８００号公報JP 2003-148800 A 特開２００９−１５６４９５号公報JP 2009-156495 A

ところで、この従来の貯湯式給湯風呂装置は、風呂凍結予防運転を行う際、風呂循環回路に循環できるほど浴槽内に浴槽水が残っている場合と、風呂循環回路に循環できるほど浴槽内に浴槽水が残っていない場合とがあり、浴槽内に浴槽水が残っている場合は、上述したように、風呂循環回路を循環する浴槽水の放熱によって貯湯タンクユニット内の配管や主要部品の凍結を予防できるが、浴槽内に浴槽水が残っていない場合、風呂循環回路を循環する浴槽水の放熱を得られないので、浴槽内に浴槽水が残っている場合に比べて、貯湯タンクユニット内の配管や主要部品の凍結の危険性が増すものである。ここで、上述した凍結予防沸上運転は、凍結予防沸上運転用に設定された条件のもと実行され、風呂循環回路を循環する浴槽水が浴槽内に残っているか否かに関係ないものである。そうなると、風呂循環回路を循環する浴槽水がない場合には、貯湯タンクユニット内の配管や主要部品の凍結を予防するための処置としては、凍結予防沸上運転しかなく、風呂凍結予防運転分だけ不足するので、最悪の場合、貯湯タンクユニット内の配管や主要部品が凍結するおそれがあるという問題を有するものであった。 By the way, this conventional hot water storage hot-water bath apparatus has a bath tub in the bathtub so that it can be circulated in the bath circulation circuit when the bath water remains in the bathtub so that it can be circulated in the bath circulation circuit when performing bath freezing prevention operation. If there is no water left, and there is still water in the bathtub, as described above, the piping and main parts in the hot water tank unit can be frozen by the heat dissipation of the bathtub water circulating in the bath circulation circuit. This can be prevented, but if there is no bathtub water remaining in the bathtub, heat from the bathtub water circulating in the bath circulation circuit cannot be obtained, so compared to when the bathtub water remains in the bathtub, This increases the risk of freezing piping and major components. Here, the above-described freeze prevention boiling operation is executed under the conditions set for the freeze prevention boiling operation, regardless of whether or not the bathtub water circulating in the bath circulation circuit remains in the bathtub. It is. Then, if there is no bathtub water circulating in the bath circulation circuit, the only measures to prevent freezing of the piping and main parts in the hot water tank unit are freezing prevention boiling operation, only for bath freezing prevention operation. In the worst case, there is a problem that piping and main parts in the hot water storage tank unit may freeze.

そこで、この発明は上記課題を解決するために、特に請求項１ではその構成を、湯水を貯湯する貯湯タンクを有する貯湯タンクユニットと、前記貯湯タンク下部から取り出した湯水を前記貯湯タンク上部に戻す加熱循環回路と、該加熱循環回路の途中に設けられ湯水を加熱する加熱手段と、前記加熱循環回路の途中に設けられ前記貯湯タンク内の湯水を前記加熱循環回路に循環させる加熱循環ポンプと、前記貯湯タンク内の湯水の温度を検出する貯湯温度検出手段と、外気温度を検出する外気温度検出手段と、前記貯湯タンク内の湯水を熱源として浴槽水を加熱する風呂熱交換器と、浴槽と前記風呂熱交換器とを接続した風呂循環回路と、該風呂循環回路に設けられ浴槽水を循環させる風呂循環ポンプと、浴槽水の有無を検出する検出手段と、これらの作動を制御する制御手段とを備え、前記制御手段は、前記外気温度検出手段で検出される外気温度が低く、かつ、前記貯湯温度検出手段で検出される湯水の温度が低いときに、前記加熱手段により前記貯湯タンク内の湯水を所定の目標沸上温度で沸き上げる凍結予防沸上運転を行わせるようにした貯湯式給湯風呂装置において、前記検出手段の検出する浴槽水の有無に基づいて、前記凍結予防沸上運転の運転条件としての前記所定の目標沸上温度、運転開始外気温度条件、運転開始貯湯温度条件、運転終了貯湯温度条件を設定する設定手段を設け、該設定手段は、前記検出手段が浴槽水ありを検出したときよりも、前記検出手段が浴槽水なしを検出したときの方が、前記凍結予防沸上運転の前記運転条件のうち少なくとも一つを凍結を回避する安全側に設定するものとした。 Therefore, in order to solve the above-mentioned problems, the present invention particularly has a configuration according to claim 1 in which a hot water storage tank unit having a hot water storage tank for storing hot water and hot water taken out from the lower part of the hot water storage tank are returned to the upper part of the hot water storage tank. A heating circulation circuit, heating means provided in the middle of the heating circulation circuit for heating hot water, and a heating circulation pump provided in the middle of the heating circulation circuit for circulating hot water in the hot water storage tank to the heating circulation circuit; A hot water storage temperature detecting means for detecting the temperature of the hot water in the hot water storage tank, an outside air temperature detecting means for detecting an outside air temperature, a bath heat exchanger for heating the bath water using the hot water in the hot water storage tank as a heat source, and a bathtub, A bath circulation circuit connected to the bath heat exchanger, a bath circulation pump provided in the bath circulation circuit to circulate bathtub water, and detection means for detecting presence or absence of bathtub water; Control means for controlling these operations, the control means, when the outside air temperature detected by the outside air temperature detection means is low, and when the temperature of hot water detected by the hot water storage temperature detection means is low, In the hot water storage hot water bath apparatus in which the hot water in the hot water storage tank is boiled at a predetermined target boiling temperature by the heating means, based on the presence or absence of bath water detected by the detection means. And setting means for setting the predetermined target boiling temperature, the operation start outside air temperature condition, the operation start hot water temperature condition, and the operation end hot water storage temperature condition as operation conditions of the freeze prevention boiling operation, More preferably, at least one of the operating conditions of the freeze-preventing boiling operation is frozen when the detection means detects no bath water than when the detection means detects the presence of bath water. It was assumed to be set on the safe side to avoid.

また、請求項２では、前記設定手段は、前記検出手段が浴槽水ありを検出したときよりも、前記検出手段が浴槽水なしを検出したときの方が、前記貯湯タンク内の湯水の熱量を増やすように前記凍結予防沸上運転の前記運転条件を設定するものとした。 According to a second aspect of the present invention, the setting means determines the amount of hot water in the hot water storage tank when the detection means detects no bath water than when the detection means detects the presence of bath water. The operating conditions for the freeze-preventing boiling operation are set so as to increase.

また、請求項３では、前記設定手段は、前記検出手段が浴槽水ありを検出したときよりも、前記検出手段が浴槽水なしを検出したときの方が、前記凍結予防沸上運転の運転開始を早めるように前記凍結予防沸上運転の前記運転条件を設定するものとした。 According to a third aspect of the present invention, the setting means starts the operation of the freeze-prevention boiling operation when the detection means detects no bath water than when the detection means detects the presence of bath water. The operating conditions for the freeze-preventing boiling operation are set so as to speed up the operation.

また、請求項４では、前記設定手段は、前記検出手段が浴槽水ありを検出したときよりも、前記検出手段が浴槽水なしを検出したときの方が、前記所定の目標沸上温度が高くなるように前記運転条件を設定するものとした。 According to a fourth aspect of the present invention, the predetermined target boiling temperature is higher when the detection means detects the absence of bath water than when the detection means detects the presence of bath water. The operating conditions were set so that

また、請求項５では、前記貯湯温度検出手段は前記貯湯タンク側面の上下方向に複数個配置され、前記検出手段が浴槽水なしを検出したときに前記設定手段によって設定される前記凍結予防沸上運転の前記運転終了貯湯温度条件を判断する前記貯湯温度検出手段を、前記検出手段が浴槽水ありを検出したときに前記設定手段によって設定される前記凍結予防沸上運転の前記運転終了貯湯温度条件を判断する前記貯湯温度検出手段よりも下方に位置する前記貯湯温度検出手段とするものとした。 Further, in claim 5, a plurality of the hot water storage temperature detection means are arranged in the vertical direction of the hot water storage tank side surface, and the freeze prevention boiling is set by the setting means when the detection means detects the absence of bath water. The hot water storage temperature detection means for determining the operation end hot water storage temperature condition of the operation is set by the setting means when the detection means detects the presence of bath water. It is assumed that the hot water storage temperature detecting means is located below the hot water storage temperature detecting means.

また、請求項６では、前記検出手段が浴槽水なしを検出したときに前記設定手段によって設定される前記凍結予防沸上運転の前記運転開始外気温度条件を、前記検出手段が浴槽水ありを検出したときに前記設定手段によって設定される前記凍結予防沸上運転の前記運転開始外気温度条件よりも高い温度に設定するものとした。 According to a sixth aspect of the present invention, when the detection means detects the absence of bath water, the operation start outside air temperature condition of the freeze prevention boiling-up operation set by the setting means is detected, and the detection means detects presence of bath water. When this is done, the temperature is set to be higher than the operation start outside air temperature condition of the freeze prevention boiling-up operation set by the setting means.

また、請求項７では、前記貯湯温度検出手段は前記貯湯タンク側面の上下方向に複数個配置され、前記検出手段が浴槽水なしを検出したときに前記設定手段によって設定される前記凍結予防沸上運転の前記運転開始貯湯温度条件を判断する前記貯湯温度検出手段を、前記検出手段が浴槽水ありを検出したときに前記設定手段によって設定される前記凍結予防沸上運転の前記運転開始貯湯温度条件を判断する前記貯湯温度検出手段よりも下方に位置する前記貯湯温度検出手段とするものとした。 Further, according to claim 7, a plurality of the hot water storage temperature detecting means are arranged in the vertical direction of the hot water tank side surface, and the freezing prevention boiling temperature set by the setting means when the detecting means detects the absence of bath water. The hot water storage temperature detection means for determining the operation start hot water storage temperature condition of the operation, the operation start hot water storage temperature condition of the freeze prevention boiling-up operation set by the setting means when the detection means detects the presence of bath water It is assumed that the hot water storage temperature detecting means is located below the hot water storage temperature detecting means.

この発明の請求項１によれば、設定手段は、検出手段が浴槽水ありを検出したときよりも、検出手段が浴槽水なしを検出したときの方が、凍結予防沸上運転の運転条件のうち少なくとも一つ凍結を回避する安全側に設定するので、凍結予防沸上運転を行うことで、貯湯タンクユニット内の雰囲気温度が上昇し、確実に貯湯タンクユニット内の配管や主要部品に対する凍結を予防することができるものである。 According to the first aspect of the present invention, the setting means has the operating condition for the freeze-prevention boiling operation when the detection means detects no bath water than when the detection means detects the presence of bath water. At least one of them is set on the safe side to avoid freezing, so by performing freeze-prevention boiling operation, the atmospheric temperature in the hot water tank unit rises, and freezing of the piping and main parts in the hot water tank unit is ensured. It can be prevented.

また、請求項２によれば、設定手段は、検出手段が浴槽水ありを検出したときよりも、検出手段が浴槽水なしを検出したときの方が、貯湯タンク内の湯水の熱量を増やすように凍結予防沸上運転の運転条件を設定するので、浴槽水があるときに凍結予防に寄与する放熱分を、貯湯タンク内の湯水の熱量を増やすことで補うことができ、貯湯タンクユニット内の雰囲気温度が上昇し、貯湯タンクユニット内の配管や主要部品に対する凍結を予防することができるものである。 According to claim 2, the setting means increases the amount of hot water in the hot water storage tank when the detection means detects the absence of bath water, rather than when the detection means detects the presence of bath water. Since the operating conditions for freezing-prevention boiling operation are set, the heat radiation that contributes to freezing prevention when there is bathtub water can be compensated for by increasing the amount of hot water in the hot water tank. The atmospheric temperature rises, and freezing of piping and main parts in the hot water storage tank unit can be prevented.

また、請求項３によれば、設定手段は、検出手段が浴槽水ありを検出したときよりも検出手段が浴槽水なしを検出したときの方が、凍結予防沸上運転の運転開始を早めるように凍結予防沸上運転の運転条件を設定することで、浴槽水なしの方が凍結予防沸上運転の開始が早くなるので、早めに貯湯タンクユニット内の雰囲気温度を上昇させて、貯湯タンクユニット内の配管や主要部品に対する凍結を予防することができるものである。 According to the third aspect, the setting means accelerates the start of the freeze-preventing boiling-up operation when the detection means detects no bath water than when the detection means detects the presence of bath water. By setting the operating conditions for freeze-prevention boiling operation, the start of the freeze-prevention boiling operation is quicker without bath water, so the temperature of the hot water storage tank unit is raised earlier and the hot water storage tank unit It is possible to prevent freezing of internal pipes and main parts.

また、請求項４によれば、設定手段は、検出手段が浴槽水ありを検出したときよりも、検出手段が浴槽水なしを検出したときの方が、所定の目標沸上温度が高くなるように運転条件を設定するので、浴槽水があるときに凍結予防に寄与する放熱分を、目標沸上温度を高くして貯湯タンク内の湯水の熱量を増やすことで補うことができ、貯湯タンクユニット内の雰囲気温度が上昇し、貯湯タンクユニット内の配管や主要部品に対する凍結を予防することができるものである。 According to claim 4, the setting means is configured such that the predetermined target boiling temperature is higher when the detection means detects the absence of bath water than when the detection means detects the presence of bath water. Since the operating conditions are set in the hot water storage tank unit, the heat release that contributes to freezing prevention when there is bathtub water can be compensated by increasing the target boiling temperature and increasing the amount of hot water in the hot water storage tank. The ambient temperature rises, and freezing of piping and main parts in the hot water storage tank unit can be prevented.

また、請求項５によれば、検出手段が浴槽水なしを検出したときに設定手段によって設定される凍結予防沸上運転の運転終了貯湯温度条件を判断する貯湯温度検出手段を、検出手段が浴槽水ありを検出したときに設定手段によって設定される凍結予防沸上運転の運転終了貯湯温度条件を判断する貯湯温度検出手段よりも下方に位置する貯湯温度検出手段としたので、検出手段が浴槽水なしを検出したときに設定手段によって設定される凍結予防沸上運転の方が貯湯タンク内の湯水の沸き上げ量が増え、浴槽水があるときに凍結予防に寄与する放熱分を、沸き上げ量を多くして貯湯タンク内の湯水の熱量を増やすことで補うことができ、貯湯タンクユニット内の雰囲気温度が上昇し、貯湯タンクユニット内の配管や主要部品に対する凍結を予防することができるものである。 According to a fifth aspect of the present invention, the detection means includes a hot water storage temperature detection means for determining an operation end hot water storage temperature condition set by the setting means when the detection means detects the absence of bath water. Since the hot water storage temperature detecting means positioned below the hot water storage temperature detecting means for determining the operation end hot water storage temperature condition set by the setting means when the presence of water is detected, the detecting means is bath water. In the freezing prevention boiling operation set by the setting means when none is detected, the boiling amount of hot water in the hot water storage tank increases, and when there is bathtub water, the amount of heat released that contributes to freezing prevention is increased. Can be compensated for by increasing the amount of hot water in the hot water tank, increasing the ambient temperature in the hot water tank unit and preventing freezing of the piping and main parts in the hot water tank unit It is those that can Rukoto.

また、請求項６によれば、検出手段が浴槽水なしを検出したときに設定手段によって設定される凍結予防沸上運転の運転開始外気温度条件を、検出手段が浴槽水ありを検出したときに設定手段によって設定される凍結予防沸上運転の運転開始外気温度条件よりも高い温度に設定したことで、貯湯タンク内の湯量が少ない状態となっているときに、検出手段が浴槽水なしを検出したときに設定手段によって設定される凍結予防沸上運転の方が凍結予防沸上運転の開始が早くなるので、早めに貯湯タンクユニット内の雰囲気温度を上昇させて、貯湯タンクユニット内の配管や主要部品に対する凍結を予防することができるものである。 According to the sixth aspect of the present invention, when the detection means detects the presence of bath water, the operation start outside air temperature condition of the anti-freezing boiling operation set by the setting means when the detection means detects the absence of bath water. The detection means detects the absence of bath water when the amount of hot water in the hot water storage tank is low by setting the temperature higher than the outside air temperature condition that is set by the setting means. In the freeze prevention boiling operation set by the setting means, the start of the freeze prevention boiling operation is earlier, so the ambient temperature in the hot water tank unit is raised earlier, and the piping in the hot water storage tank unit It is possible to prevent freezing of main parts.

また、請求項７によれば、検出手段が浴槽水なしを検出したときに設定手段によって設定される凍結予防沸上運転の運転開始貯湯温度条件を判断する貯湯温度検出手段を、検出手段が浴槽水ありを検出したときに設定手段によって設定される凍結予防沸上運転の運転開始貯湯温度条件を判断する貯湯温度検出手段よりも下方に位置する貯湯温度検出手段としたので、貯湯タンク内の湯水の温度分布から貯湯タンク内の下方に向かうほど貯湯されている湯水の温度は低く、運転開始貯湯温度条件が成立しやすい方向となり、検出手段が浴槽水なしを検出したときに設定手段によって設定される凍結予防沸上運転の方が凍結予防沸上運転の運転開始が早くなるので、早めに貯湯タンクユニット内の雰囲気温度を上昇させて、貯湯タンクユニット内の配管や主要部品に対する凍結を予防することができるものである。 According to a seventh aspect of the present invention, the hot water storage temperature detecting means for determining the operation start hot water storage temperature condition of the freeze-preventing boiling operation set by the setting means when the detecting means detects the absence of bath water. Since the hot water storage temperature detecting means is located below the hot water storage temperature detecting means for determining the operation start hot water storage temperature condition set by the setting means when the presence of water is detected, the hot water in the hot water storage tank is The temperature of the hot water stored in the hot water tank decreases from the temperature distribution of the hot water tank to the lower side, and the temperature condition for starting the hot water storage tends to be satisfied, and is set by the setting means when the detection means detects no bath water. Since the freeze-prevention boiling operation starts more quickly, the ambient temperature in the hot water tank unit is raised earlier, It is capable of preventing freezing for piping and key components.

この発明の貯湯式給湯風呂装置の一実施形態の概略構成図。The schematic block diagram of one Embodiment of the hot water storage type hot-water supply bath apparatus of this invention. 同一実施形態の風呂凍結予防運転の動作を示すフローチャート。The flowchart which shows the operation | movement of the bath freezing prevention driving | operation of the same embodiment. 同一実施形態の浴槽水ありの場合の第１凍結予防沸上運転の動作を示すフローチャート。The flowchart which shows operation | movement of the 1st freezing prevention boiling top driving | operation in the case with bathtub water of the same embodiment. 同一実施形態の浴槽水なしの場合の第２凍結予防沸上運転の動作を示すフローチャート。The flowchart which shows the operation | movement of the 2nd freezing prevention boiling top operation in the case of the absence of bathtub water of the same embodiment. 同一実施形態の浴槽水なしの場合の第３凍結予防沸上運転の動作を示すフローチャート。The flowchart which shows the operation | movement of the 3rd freezing prevention boiling top operation in the case of the absence of bathtub water of the same embodiment. 同一実施形態の浴槽水なしの場合の第４凍結予防沸上運転の動作を示すフローチャート。The flowchart which shows the operation | movement of the 4th freezing prevention boiling top operation in the case of the absence of bathtub water of the same embodiment. 同一実施形態の浴槽水なしの場合の第５凍結予防沸上運転の動作を示すフローチャート。The flowchart which shows the operation | movement of the 5th freezing prevention boiling top operation in the case of the absence of bathtub water of the same embodiment.

次に、本発明の貯湯式給湯風呂装置の一実施形態について図１に基づき説明する。
１は湯水を貯湯する貯湯タンク２を有する貯湯タンクユニット、３は貯湯タンク２内の湯水を加熱する加熱手段としてのヒートポンプ式加熱手段であり、ヒートポンプ式加熱手段３は、冷媒を圧縮する圧縮機４と、圧縮機４から吐出された高温高圧の冷媒と水とを熱交換する凝縮器としての水冷媒熱交換器５と、水冷媒熱交換器５通過後の冷媒を減圧させる減圧器としての膨張弁６と、膨張弁６からの低温低圧の冷媒を蒸発させる蒸発器としての空気熱交換器７とを備え、空気熱交換器７で吸熱した冷媒を圧縮機４で圧縮して水冷媒熱交換器５を介して水を加熱するようにしている。また、８は外気温度を検出する外気温度検出手段としての外気温度センサ、９は圧縮機４等のアクチュエータを制御する制御手段としてのヒーポン制御部である。 Next, an embodiment of the hot water storage hot water bath apparatus of the present invention will be described with reference to FIG.
1 is a hot water storage tank unit having a hot water storage tank 2 for storing hot water, 3 is a heat pump heating means as a heating means for heating hot water in the hot water storage tank 2, and the heat pump heating means 3 is a compressor for compressing refrigerant. 4, a water refrigerant heat exchanger 5 as a condenser for exchanging heat between the high-temperature and high-pressure refrigerant discharged from the compressor 4 and water, and a decompressor for depressurizing the refrigerant after passing through the water refrigerant heat exchanger 5 An expansion valve 6 and an air heat exchanger 7 as an evaporator for evaporating the low-temperature and low-pressure refrigerant from the expansion valve 6 are provided, and the refrigerant absorbed by the air heat exchanger 7 is compressed by the compressor 4 to produce water refrigerant heat. Water is heated through the exchanger 5. Reference numeral 8 denotes an outside air temperature sensor as outside air temperature detecting means for detecting outside air temperature, and 9 denotes a heat-pump control unit as control means for controlling an actuator such as the compressor 4.

１０は貯湯タンク２の下部と水冷媒熱交換器５の水流入口とを接続するヒーポン往き管、１１は水冷媒熱交換器５の水流出口と貯湯タンク２の上部とを接続するヒーポン戻り管で、貯湯タンク２と水冷媒熱交換器５の水側との間をヒーポン往き管１０およびヒーポン戻り管１１とで接続することで貯湯タンク２の下部から取り出した湯水を貯湯タンク２の上部へ戻す加熱循環回路１２を形成するものである。また、１３は加熱循環回路１２に設けられ、貯湯タンク２内の湯水を加熱循環回路１２に循環させる加熱循環ポンプである。 Reference numeral 10 denotes a heat pump forward pipe that connects the lower part of the hot water storage tank 2 and the water inlet of the water refrigerant heat exchanger 5, and 11 is a heatpone return pipe that connects the water outlet of the water refrigerant heat exchanger 5 and the upper part of the hot water storage tank 2. The hot water taken out from the lower part of the hot water storage tank 2 is returned to the upper part of the hot water storage tank 2 by connecting the hot water storage tank 2 and the water side of the water refrigerant heat exchanger 5 with the heat pump forward pipe 10 and the heat pump return pipe 11. The heating circulation circuit 12 is formed. Reference numeral 13 denotes a heating circulation pump provided in the heating circulation circuit 12 for circulating hot water in the hot water storage tank 2 to the heating circulation circuit 12.

１４はヒーポン戻り管１１の途中から分岐したバイパス管で、このバイパス管１４はその一端がヒーポン戻り管１１の途中に流路切替手段としてのバイパス切替弁１５を介して接続され、他端が貯湯タンク２の下部に接続されている。ここで、水冷媒熱交換器５の水流出口と貯湯タンク２の上部とを結ぶヒーポン戻り管１１は、水冷媒熱交換器５の水流出口とバイパス切替弁１５とを結ぶヒーポン戻り管１１ａと、バイパス切替弁１５と貯湯タンク２の上部とを結ぶヒーポン戻り管１１ｂとから構成され、前記バイパス切替弁１５は、例えば電動式の三方弁からなり、前記ヒーポン戻り管１１を流通する湯水を貯湯タンク２の下部に戻すように貯湯タンク２下部側に切り替えた状態、すなわちヒーポン戻り管１１ａとバイパス管１４とを連通させる状態と、ヒーポン戻り管１１を流通する湯水を貯湯タンク２上部に戻すように貯湯タンク２上部側に切り替えた状態、すなわちヒーポン戻り管１１ａとヒーポン戻り管１１ｂとを連通させる状態とに設定可能なものである。なお、１６はヒーポン戻り管１１ａに設けられ、水冷媒熱交換器５で加熱された湯水の温度を検出する熱交出口温度検出手段としての熱交出口温度センサである。 Reference numeral 14 denotes a bypass pipe branched from the middle of the heat pump return pipe 11, and one end of the bypass pipe 14 is connected to the middle of the heat pump return pipe 11 via a bypass switching valve 15 as a flow path switching means, and the other end is stored in hot water. It is connected to the lower part of the tank 2. Here, the heat pump return pipe 11 connecting the water outlet of the water refrigerant heat exchanger 5 and the upper part of the hot water storage tank 2 is a heat pump return pipe 11a connecting the water outlet of the water refrigerant heat exchanger 5 and the bypass switching valve 15; The heat exchanger return pipe 11b connecting the bypass switching valve 15 and the upper part of the hot water storage tank 2 is composed of, for example, an electric three-way valve, and the hot water flowing through the heat pump return pipe 11 is stored in the hot water storage tank. 2 so as to return to the lower side of the hot water storage tank 2 so as to return to the lower part of the hot water tank 2, that is, a state where the heat pump return pipe 11 a and the bypass pipe 14 communicate with each other. The state can be set to the state where the hot water storage tank 2 is switched to the upper side, that is, the state where the heat pump return pipe 11a and the heat pump return pipe 11b communicate with each other. Reference numeral 16 denotes a heat exchange outlet temperature sensor as a heat exchange outlet temperature detection means provided on the heat-pump return pipe 11a for detecting the temperature of hot water heated by the water / refrigerant heat exchanger 5.

１７は貯湯タンク２の下部に接続され貯湯タンク２に給水する給水管、１８は給水管１７の途中に設けられ給水圧を所定の圧力まで減圧する減圧弁、１９は貯湯タンク２の上部に接続され貯湯タンク２の上部から高温水を取り出す出湯管、２０は給水管１７から分岐した第１給水バイパス管、２１は出湯管１９からの高温の湯と第１給水バイパス管２０からの給水とを混合する電動ミキシング弁よりなる給湯混合弁、２２は給湯混合弁２１で混合された湯を所定の給湯箇所に設置された給湯栓２３に供給する給湯管である。 Reference numeral 17 denotes a water supply pipe connected to the lower part of the hot water storage tank 2 to supply water to the hot water storage tank 2, 18 is a pressure reducing valve provided in the middle of the water supply pipe 17 to reduce the water supply pressure to a predetermined pressure, and 19 is connected to the upper part of the hot water storage tank 2. A hot water outlet pipe for extracting hot water from the upper part of the hot water storage tank 2, 20 is a first water supply bypass pipe branched from the water supply pipe 17, and 21 is hot water from the hot water supply pipe 19 and water supply from the first water supply bypass pipe 20. A hot water mixing valve 22 comprising an electric mixing valve for mixing is a hot water supply pipe 22 for supplying hot water mixed by the hot water mixing valve 21 to a hot water tap 23 installed at a predetermined hot water supply location.

２４は貯湯タンク２内の湯水を熱源として浴槽２５の浴槽水を追い焚きするための蛇管よりなる風呂熱交換器、２６は風呂熱交換器２４と浴槽２５とを接続する風呂往き管２７および風呂戻り管２８からなる風呂循環回路、２９は風呂循環回路２６に設けられ浴槽水を循環させる風呂循環ポンプ、３０は風呂循環回路２６に設けられ、風呂循環回路２６での流水の有無を検出することで、風呂循環回路２６に循環できる浴槽水の有無、すなわち浴槽２５内に浴槽２５の循環口（図示せず）以上の残り湯の有無を検出する検出手段としての流水スイッチ、３１は風呂循環回路２６に設けられた浴槽水の温度を検出する風呂温度センサである。 Reference numeral 24 denotes a bath heat exchanger composed of a serpentine tube for chasing the bathtub water in the bathtub 25 using hot water in the hot water storage tank 2 as a heat source. Reference numeral 26 denotes a bath outlet pipe 27 and a bath connecting the bath heat exchanger 24 and the bathtub 25. A bath circulation circuit composed of a return pipe 28, a bath circulation pump 29 provided in the bath circulation circuit 26 for circulating bath water, and 30 provided in the bath circulation circuit 26 for detecting the presence or absence of flowing water in the bath circulation circuit 26. Thus, a running water switch 31 as a detecting means for detecting the presence or absence of bathtub water that can be circulated in the bath circulation circuit 26, that is, the presence or absence of remaining hot water in the bathtub 25 beyond the circulation port (not shown) of the bathtub 25, 26 is a bath temperature sensor that detects the temperature of the bath water provided in 26.

３２は風呂往き管２７と風呂戻り管２８とを接続して風呂熱交換器２４をバイパスする風呂バイパス管、３３は風呂バイパス管３２と風呂循環回路２６との接続部に設けられ、風呂熱交換器２４側に浴槽水を流通させる状態と風呂熱交換器２４をバイパスして風呂バイパス管３２側に浴槽水を流通させる状態とに切り替え可能な電動三方弁よりなる風呂三方弁であり、この風呂三方弁３３は、浴槽２５内の浴槽水を追い焚きするときには、風呂熱交換器２４側に浴槽水を流通させる状態に切り替えられ、浴槽２５へ湯張りを行うとき、または、低外気温時に風呂循環回路２６の凍結を予防するため風呂循環ポンプ２９を駆動させて浴槽水を循環させる風呂凍結予防運転を行うときには、風呂熱交換器２４をバイパスして風呂バイパス管３２側に浴槽水を流通させる状態に切り替えられるものである。 A bath bypass pipe 32 bypasses the bath heat exchanger 24 by connecting the bath outlet pipe 27 and the bath return pipe 28, and 33 is provided at a connection portion between the bath bypass pipe 32 and the bath circulation circuit 26. This is a bath three-way valve comprising an electric three-way valve that can be switched between a state in which bathtub water is circulated on the vessel 24 side and a state in which bath water is circulated on the bath bypass pipe 32 side by bypassing the bath heat exchanger 24. The three-way valve 33 is switched to a state in which the bath water is circulated to the bath heat exchanger 24 side when chasing the bath water in the bath 25, and when bathing is performed on the bath 25 or when the outdoor temperature is low. In order to prevent the freezing of the circulation circuit 26, the bath circulation pump 29 is driven to perform the bath freezing prevention operation for circulating the bath water, and the bath heat exchanger 24 is bypassed and the bath bypass pipe 32 side is bypassed. In which is switched to a state for circulating the bath water.

３４は出湯管１９から分岐し貯湯タンク２上部から高温水を取り出す風呂出湯管、３５は第１給水バイパス管２０から分岐した第２給水バイパス管、３６は風呂出湯管３４からの高温の湯と第２給水バイパス管３５からの給水とを混合する電動ミキシング弁よりなる風呂混合弁、３７は風呂循環回路２６に接続され風呂混合弁３６で混合された湯を浴槽２５へ注湯する湯張り管、３８は湯張り管３７に設けられ浴槽２５への注湯の開始／停止を行う湯張り弁である。 34 is a bath hot water pipe that branches from the hot water pipe 19 and takes out high temperature water from the upper part of the hot water storage tank 2, 35 is a second water supply bypass pipe branched from the first water supply bypass pipe 20, and 36 is hot water from the bath hot water pipe 34. A bath mixing valve 37 comprising an electric mixing valve that mixes the water supplied from the second water supply bypass pipe 35, 37 is connected to the bath circulation circuit 26, and is filled with hot water mixed in the bath mixing valve 36 into the bathtub 25. , 38 are hot water filling valves that are provided in the hot water filling pipe 37 and start / stop pouring water into the bathtub 25.

３９は貯湯タンク２側面の上下方向に複数個配置された貯湯温度検出手段としての貯湯温度センサで、この実施形態では上から順に、貯湯温度センサ３９ａ、第１貯湯温度検出手段としての貯湯温度センサ３９ｂ、貯湯温度センサ３９ｃ、第２貯湯温度検出手段としての貯湯温度センサ３９ｄ、貯湯温度センサ３９ｅ、貯湯温度センサ３９ｆ、貯湯温度センサ３９ｇの７つが配置されているものであり、貯湯温度センサ３９が検出する湯水の温度情報によって、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。 A plurality of hot water storage temperature sensors 39 as hot water storage temperature detecting means arranged in the vertical direction on the side surface of the hot water storage tank 2. In this embodiment, the hot water storage temperature sensor 39a and the hot water storage temperature sensor as the first hot water storage temperature detecting means are arranged in order from the top. Seven hot water storage temperature sensors 39c, a hot water storage temperature sensor 39d as a second hot water storage temperature detection means, a hot water storage temperature sensor 39e, a hot water storage temperature sensor 39f, and a hot water storage temperature sensor 39g are arranged. The amount of heat remaining in the hot water storage tank 2 is detected from the detected hot water temperature information, and the vertical temperature distribution in the hot water storage tank 2 is detected.

４０はヒートポンプ式加熱手段３の駆動開始・停止制御や、貯湯タンクユニット１内の各センサの入力やリモコン（図示せず）の各種スイッチの入力を受けて各アクチュエータの作動を制御する制御手段としての貯湯制御部であり、ヒーポン制御部９と有線にて通信可能に接続されているものである。 40 is a control means for controlling the operation of each actuator in response to the start / stop control of the heat pump type heating means 3, the input of each sensor in the hot water tank unit 1 and the input of various switches of a remote controller (not shown). The hot water storage control unit is connected to the heat-pump control unit 9 in a communicable manner by wire.

前記貯湯制御部４０は、低外気温時に、風呂循環ポンプ２９を駆動させ風呂循環回路２６に浴槽水を循環させる風呂凍結予防運転や、低外気温時かつ貯湯タンク２内の湯温が低い場合に、圧縮機４および加熱循環ポンプ１３を駆動させ、水冷媒熱交換器５において冷媒と湯水との熱交換により貯湯タンク２内の湯水を所定の目標沸上温度に沸き上げ、高温の湯を貯湯タンク２に貯留することで、貯湯タンクユニット１内の配管や主要部品の凍結を予防する凍結予防沸上運転を行うものであり、貯湯制御部４０は前記凍結予防沸上運転の運転条件を設定する設定手段４１を備えているものである。 The hot water storage control unit 40 drives the bath circulation pump 29 at low outside temperature to circulate bath water in the bath circulation circuit 26, or when the hot water temperature in the hot water storage tank 2 is low at low outside temperature. Then, the compressor 4 and the heating circulation pump 13 are driven, and the water / refrigerant heat exchanger 5 heats the hot water in the hot water storage tank 2 to a predetermined target boiling temperature by heat exchange between the refrigerant and the hot water. By storing in the hot water storage tank 2, the freezing prevention boiling operation for preventing freezing of the piping and main parts in the hot water storage tank unit 1 is performed, and the hot water storage control unit 40 determines the operating conditions of the freezing prevention boiling operation. A setting means 41 for setting is provided.

前記設定手段４１は、風呂循環回路２６に循環できる浴槽水の有無を検出する検出手段（ここでは流水スイッチ３０）で検出した浴槽水の有無に基づき、凍結予防沸上運転の運転条件として、目標沸上温度、運転開始外気温度条件、運転開始貯湯温度条件、運転終了貯湯温度条件を設定するものであり、検出手段が浴槽水ありを検出したときよりも浴槽水なしを検出したときの方が、凍結予防沸上運転の運転条件を凍結を回避する安全側に設定するものである。 The setting means 41 is based on the presence / absence of bath water detected by the detection means (here, running water switch 30) for detecting the presence / absence of bath water that can be circulated in the bath circulation circuit 26. It sets boiling temperature, operation start outside air temperature condition, operation start hot water storage temperature condition, operation end hot water storage temperature condition, and when detection means detects no bath water than when bath water is detected The operating conditions for the freeze-prevention boiling operation are set to the safe side to avoid freezing.

なお、図１中の２点鎖線で囲まれた四角の枠内の配管（第１給水バイパス管２０や第２給水バイパス管３５等）や主要部品（風呂混合弁３６）は、他の配管や他の主要部品に比べて、低外気温時に凍結する可能性が高いものである。 In addition, piping (the 1st water supply bypass pipe 20, the 2nd water supply bypass pipe 35, etc.) and main parts (bath mixing valve 36) in the square frame enclosed with the dashed-two dotted line in FIG. Compared to other main parts, it is more likely to freeze at low outside temperatures.

次に、図１に示した一実施形態の貯湯式給湯風呂装置の動作を説明する。
まず、貯湯タンク２内の湯水をヒートポンプ式加熱手段３により所定の目標沸上温度に沸き上げる沸上運転について説明すると、時間帯別契約電力の電力単価が安価な深夜電力時間帯になって、貯湯温度センサ３９が貯湯タンク２内に翌日に必要な熱量が残ってないことを検出すると、深夜電力時間帯の所定の時刻において貯湯制御部４０はヒーポン制御部９に対して沸上運転開始を指示する。 Next, the operation of the hot water storage hot water bath apparatus of one embodiment shown in FIG. 1 will be described.
First, the boiling operation in which hot water in the hot water storage tank 2 is heated to a predetermined target boiling temperature by the heat pump type heating means 3 will be described. When the hot water storage temperature sensor 39 detects that the required amount of heat does not remain in the hot water storage tank 2 the next day, the hot water storage control unit 40 starts the boiling operation for the heat pump control unit 9 at a predetermined time in the midnight power time zone. Instruct.

そして、指示を受けたヒーポン制御部９は圧縮機４や加熱循環ポンプ１３を駆動させ、沸上運転を開始し、貯湯タンク２下部から供給される湯水を加熱して熱交出口温度センサ１６で検出される温度が所定の目標沸上温度になるようにするものである。ここで、熱交出口温度センサ１６で検出される温度が所定の目標沸上温度より低い場合は、バイパス切替弁１５はバイパス管１４側に切り替えた状態であり、貯湯タンク２下部から取り出された湯水は、ヒーポン往き管１０、水冷媒熱交換器５の水側、ヒーポン戻り管１１ａ、バイパス管１４を循環し、再び貯湯タンク２の下部に戻るものである。ここで、熱交出口温度センサ１６で検出される温度が所定の目標沸上温度に到達すると、バイパス切替弁１５をヒーポン戻り管１１ｂ側に切り替え、貯湯タンク２下部から取り出された湯水は、ヒーポン往き管１０、水冷媒熱交換器５の水側、ヒーポン戻り管１１ａ、ヒーポン戻り管１１ｂを循環し、貯湯タンク２上部に戻し、貯湯タンク２上部から順次積層して高温水を貯湯していく。そして、貯湯温度センサ３９が必要な熱量が貯湯タンク２内に貯湯されたことを検出すると、貯湯制御部４０はヒーポン制御部９に対して沸上運転停止を指示し、指示を受けたヒーポン制御部９は圧縮機４や加熱循環ポンプ１３の駆動を停止させ、沸上運転を終了するものである。 Upon receiving the instruction, the heat pump control unit 9 drives the compressor 4 and the heating circulation pump 13 to start the boiling operation, heats the hot water supplied from the lower part of the hot water storage tank 2, and uses the heat exchange outlet temperature sensor 16. The detected temperature is set to a predetermined target boiling temperature. Here, when the temperature detected by the heat exchange outlet temperature sensor 16 is lower than a predetermined target boiling temperature, the bypass switching valve 15 is switched to the bypass pipe 14 side and is taken out from the lower part of the hot water storage tank 2. The hot water circulates through the heat pump forward pipe 10, the water side of the water refrigerant heat exchanger 5, the heat pump return pipe 11 a, and the bypass pipe 14, and returns to the lower part of the hot water storage tank 2 again. Here, when the temperature detected by the heat exchange outlet temperature sensor 16 reaches a predetermined target boiling temperature, the bypass switching valve 15 is switched to the side of the heat pump return pipe 11b, and the hot water taken out from the lower part of the hot water storage tank 2 Circulating the forward pipe 10, the water side of the water refrigerant heat exchanger 5, the heat pump return pipe 11a, and the heat pump return pipe 11b, return to the upper part of the hot water storage tank 2, and sequentially stack from the upper part of the hot water storage tank 2 to store hot water. . When the hot water storage temperature sensor 39 detects that the necessary amount of heat has been stored in the hot water storage tank 2, the hot water storage control unit 40 instructs the heat pump control unit 9 to stop the boiling operation, and the heat pump control that has received the instruction The unit 9 stops driving the compressor 4 and the heating circulation pump 13 and ends the boiling operation.

次に、風呂循環ポンプ２９を駆動させて風呂循環回路２６に浴槽水を循環させる風呂凍結予防運転の動作について、図２に示したフローチャートに基づき説明すると、貯湯制御部４０は外気温度センサ８の検出する外気温度が第１外気温度としての３℃より低いか否か判断し（ステップＳ１）、外気温度センサ８の検出する外気温度が３℃より低いと判断すると、風呂三方弁３３を風呂バイパス管３２側に切り替え（ステップＳ２）、風呂循環ポンプ２９を駆動させるものである（ステップＳ３）。 Next, the operation of the bath freezing prevention operation in which the bath circulation pump 29 is driven to circulate bath water in the bath circulation circuit 26 will be described based on the flowchart shown in FIG. It is determined whether or not the detected outside air temperature is lower than 3 ° C. as the first outside air temperature (step S1), and if it is determined that the outside air temperature detected by the outside air temperature sensor 8 is lower than 3 ° C., the bath three-way valve 33 is bypassed. Switching to the pipe 32 side (step S2), the bath circulation pump 29 is driven (step S3).

前記貯湯制御部４０は、前記ステップ３で風呂循環ポンプ２９を駆動させた後、流水スイッチ３０がＯＮしたか否か、すなわち、風呂循環回路２６に循環できる浴槽水があるか否かを判断し（ステップＳ４）、流水スイッチ３０がＯＮした、すなわち、浴槽２５内に浴槽２５の循環口（図示せず）以上の残り湯があり、風呂循環回路２６に循環できる浴槽水があると判断すると、風呂温度センサ３１の検出する浴槽水の温度が１０℃より高いか否か判断し（ステップＳ５）、風呂温度センサ３１の検出する浴槽水の温度が１０℃より高いと判断すると、浴槽水の凍結のおそれがないとして、風呂循環ポンプ２９を停止させ（ステップＳ６）、風呂凍結予防運転を終了するものである。また、前記ステップＳ５で、風呂温度センサ３１の検出する浴槽水の温度が１０℃以下であると判断すると、浴槽水の凍結のおそれがあるとして、風呂循環ポンプ２９の駆動を継続させステップＳ５の処理を繰り返すものである。なお、前記貯湯制御部４０は、前記ステップＳ４で流水スイッチ３０がＯＦＦである、すなわち、浴槽２５内に浴槽２５の循環口以上の残り湯がなく、風呂循環回路２６に循環できる浴槽水がないと判断すると、前記ステップＳ６の処理にとび、風呂循環ポンプ２９を停止させ（ステップＳ６）、風呂凍結予防運転を終了するものである。 The hot water storage control unit 40 determines whether or not the running water switch 30 is turned on after the bath circulation pump 29 is driven in Step 3, that is, whether or not there is bathtub water that can be circulated in the bath circulation circuit 26. (Step S4), when it is determined that the running water switch 30 is turned on, that is, there is remaining hot water in the bathtub 25 or more than the circulation port (not shown) of the bathtub 25 and there is bathtub water that can be circulated in the bath circulation circuit 26, It is determined whether or not the temperature of the bath water detected by the bath temperature sensor 31 is higher than 10 ° C. (step S5), and when the temperature of the bath water detected by the bath temperature sensor 31 is determined to be higher than 10 ° C., the bath water is frozen. The bath circulation pump 29 is stopped (step S6), and the bath freeze prevention operation is terminated. If it is determined in step S5 that the temperature of the bath water detected by the bath temperature sensor 31 is 10 ° C. or less, the bath circulation pump 29 is continuously driven because the bath water may be frozen. The process is repeated. In the hot water storage control unit 40, the flowing water switch 30 is OFF in step S4, that is, there is no remaining hot water in the bathtub 25 beyond the circulation port of the bathtub 25, and there is no bathtub water that can be circulated to the bath circulation circuit 26. If it is determined, step S6 is skipped, the bath circulation pump 29 is stopped (step S6), and the bath freeze prevention operation is terminated.

上述した風呂凍結予防運転では、浴槽２５内に浴槽２５の循環口以上の残り湯があり、浴槽２５からの浴槽水を風呂戻り管２８から風呂バイパス管３２を介して風呂往き管２７に循環させ浴槽２５内に戻すことができる浴槽水がある場合、風呂循環ポンプ２９を駆動させて循環させた浴槽水により上記の循環経路の凍結を予防することができ、また、そのときの浴槽水の放熱により、貯湯タンクユニット１内の雰囲気温度が上昇するため、貯湯タンクユニット１内の配管や主要部品、特に、２点鎖線で囲まれた四角の枠内の配管や主要部品に対する凍結を予防することができるものである。 In the bath freezing prevention operation described above, there is remaining hot water in the bathtub 25 that exceeds the circulation port of the bathtub 25, and the bathtub water from the bathtub 25 is circulated from the bath return pipe 28 to the bath outlet pipe 27 through the bath bypass pipe 32. When there is bathtub water that can be returned to the bathtub 25, the bath circulation pump 29 is driven to circulate the bathtub water to prevent the circulation path from being frozen. As a result, the atmospheric temperature in the hot water storage tank unit 1 rises, so that the piping and main parts in the hot water storage tank unit 1, in particular, the piping and main parts in the square frame surrounded by the two-dot chain line should be prevented from freezing. It is something that can be done.

なお、前記ステップＳ４で、流水スイッチ３０がＯＮとなり流水ありを検出して、風呂循環回路２６に循環できる浴槽水があることを検出すると、浴槽水ありという情報に基づいて設定手段４１は前記凍結予防沸上運転の運転条件を設定すると共に、前記ステップＳ４で、流水スイッチ３０がＯＮとならずＯＦＦで流水なしを検出して、風呂循環回路２６に循環できる浴槽水がないことを検出すると、浴槽水なしという情報に基づいて設定手段４１は前記凍結予防沸上運転の運転条件を設定するものである。 In step S4, when the flowing water switch 30 is turned ON to detect the presence of flowing water and to detect that there is bathtub water that can be circulated in the bath circulation circuit 26, the setting means 41 determines whether the freezing water is present or not. In addition to setting the operating conditions for the preventive boiling operation, and detecting that there is no flowing water in the bath circulation circuit 26 by detecting that the flowing water switch 30 is not ON and detecting no flowing water in step S4, Based on the information that there is no bath water, the setting means 41 sets the operating condition for the freeze-prevention boiling operation.

次に、低外気温かつ貯湯タンク２内の湯温が低い場合に、圧縮機４および加熱循環ポンプ１３を駆動させて貯湯タンク２内の湯水を沸き上げ、高温の湯を貯湯タンク２に貯留し貯湯タンクユニット１内の配管や主要部品の凍結を予防する凍結予防沸上運転の動作について、図３に示したフローチャートに基づき第１凍結予防沸上運転について説明するが、この第１凍結予防沸上運転は、前記風呂凍結予防運転において、流水スイッチ３０がＯＮで流水ありを検出して、風呂循環回路２６に循環できる浴槽水があることを検出した結果に基づき、設定手段４１が設定した運転条件で行われる凍結予防沸上運転である。 Next, when the outdoor temperature is low and the hot water temperature in the hot water storage tank 2 is low, the compressor 4 and the heating circulation pump 13 are driven to boil hot water in the hot water storage tank 2, and hot hot water is stored in the hot water storage tank 2. The operation of the freeze-prevention boiling operation for preventing the freezing of the piping and main parts in the hot water storage tank unit 1 will be described with reference to the flowchart shown in FIG. The boiling operation is set by the setting means 41 based on the result of detecting that there is water that can be circulated in the bath circulation circuit 26 in the bath freezing prevention operation when the water flow switch 30 is ON and the presence of water is detected. This is a freeze-prevention boiling operation performed under operating conditions.

前記第１凍結予防沸上運転では、設定手段４１により目標沸上温度が６５℃に設定され、凍結予防沸上運転の運転開始外気温度条件として、外気温度＜−５℃が設定され、運転開始貯湯温度条件として、貯湯温度センサ３９ｂの検出湯温＜４０℃が設定され、運転終了貯湯温度条件として、貯湯温度センサ３９ｂの検出湯温≧４５℃が設定されるものであり、貯湯制御部４０は、まず、目標沸上温度を６５℃とし（ステップＳ７）、外気温度センサ８で検出される外気温度が第２外気温度としての−５℃より低いか否か判断し（ステップＳ８）、外気温度が−５℃より低いと判断すると、貯湯温度センサ３９ｂで検出される温度が第１所定温度としての４０℃より低いか否か判断し（ステップＳ９）、貯湯温度センサ３９ｂで検出される温度が４０℃以上の場合は前記ステップＳ８の処理に戻り、貯湯温度センサ３９ｂで検出される温度が４０℃より低いと判断すると、圧縮機４を駆動させると共に加熱循環ポンプ１３を駆動させ（ステップＳ１０）、貯湯タンク２内の湯水の沸き上げを開始するものである。 In the first freeze-prevention boiling operation, the target boiling temperature is set to 65 ° C. by the setting means 41, and the outdoor temperature <−5 ° C. is set as the operation start outside air temperature condition of the freeze-prevention boiling operation, and the operation is started. The detected hot water temperature of the hot water storage temperature sensor 39b <40 ° C. is set as the hot water storage temperature condition, and the detected hot water temperature of the hot water storage temperature sensor 39b ≧ 45 ° C. is set as the hot water storage temperature condition of the operation. First, the target boiling temperature is set to 65 ° C. (step S7), and it is determined whether or not the outside air temperature detected by the outside air temperature sensor 8 is lower than −5 ° C. as the second outside air temperature (step S8). If it is determined that the temperature is lower than −5 ° C., it is determined whether or not the temperature detected by the hot water storage temperature sensor 39b is lower than 40 ° C. as the first predetermined temperature (step S9), and the temperature detected by the hot water storage temperature sensor 39b. If it is 40 ° C. or higher, the process returns to step S8. If it is determined that the temperature detected by the hot water storage temperature sensor 39b is lower than 40 ° C., the compressor 4 is driven and the heating circulation pump 13 is driven (step S10). The boiling of hot water in the hot water storage tank 2 is started.

貯湯タンク２内の湯水の沸き上げが開始されると、熱交出口温度センサ１６で検出される温度が目標沸上温度（ここでは６５℃）より低い場合は、バイパス切替弁１５はバイパス管１４側に切り替えた状態であり、沸き上げた湯水は貯湯タンク２の下部に戻され、熱交出口温度センサ１６で検出される温度が目標沸上温度に到達すると、バイパス切替弁１５をヒーポン戻り管１１ｂ側に切り替え、沸き上げた湯水を貯湯タンク２上部に戻し、貯湯タンク２上部から高温水を貯湯していくものである。 When boiling of hot water in the hot water storage tank 2 is started, if the temperature detected by the heat exchange outlet temperature sensor 16 is lower than the target boiling temperature (here, 65 ° C.), the bypass switching valve 15 is connected to the bypass pipe 14. When the temperature detected by the heat exchange outlet temperature sensor 16 reaches the target boiling temperature, the bypass switching valve 15 is connected to the heat pump return pipe. It switches to 11b side, returns the boiled hot water to the hot water storage tank 2 upper part, and stores hot water from the hot water storage tank 2 upper part.

そして、貯湯制御部４０は、貯湯温度センサ３９ｂの検出する温度が第２所定温度としての４５℃以上であるか否かを判断し（ステップＳ１０）、貯湯温度センサ３９ｂの検出する温度が４５℃以上であると判断すると、圧縮機４を停止させると共に加熱循環ポンプ１３を停止させ、第１凍結予防沸上運転を終了するものである。 And the hot water storage control part 40 judges whether the temperature which the hot water storage temperature sensor 39b detects is 45 degreeC or more as 2nd predetermined temperature (step S10), and the temperature which the hot water storage temperature sensor 39b detects is 45 degreeC. If it is judged as above, the compressor 4 is stopped, the heating circulation pump 13 is stopped, and the first freeze prevention boiling operation is ended.

以上説明した第１凍結予防沸上運転によれば、貯湯タンク２内の湯水を沸き上げて貯湯タンク２内に高温の湯を貯めることで、貯湯タンクユニット１内の雰囲気温度が上昇するため、貯湯タンクユニット１内の配管や主要部品、特に、２点鎖線で囲まれた四角の枠内の配管や主要部品に対する凍結を予防することができるものである。 According to the first freeze prevention boiling operation described above, the hot water in the hot water storage tank 2 is boiled and hot water is stored in the hot water storage tank 2, so that the atmospheric temperature in the hot water storage tank unit 1 increases. It is possible to prevent freezing of pipes and main parts in the hot water storage tank unit 1, particularly pipes and main parts in a square frame surrounded by a two-dot chain line.

次に、図４に示したフローチャートに基づき第２凍結予防沸上運転について説明するが、この第２凍結予防沸上運転は、前記風呂凍結予防運転において、流水スイッチ３０がＯＦＦで流水なしを検出して、風呂循環回路２６に循環できる浴槽水がないことを検出した結果に基づいて設定手段４１が設定した運転条件で行われる凍結予防沸上運転である。 Next, the second freeze prevention boiling operation will be described based on the flowchart shown in FIG. 4. This second freeze prevention boiling operation detects that there is no running water when the flowing water switch 30 is OFF in the bath freezing prevention operation. Thus, it is a freeze-prevention boiling-up operation performed under the operating conditions set by the setting means 41 based on the result of detecting that there is no bathtub water that can be circulated in the bath circulation circuit 26.

前記第２凍結予防沸上運転では、設定手段４１により目標沸上温度が８０℃に設定され、凍結予防沸上運転の運転開始外気温度条件として、外気温度＜−５℃が設定され、運転開始貯湯温度条件として、貯湯温度センサ３９ｂの検出湯温＜４０℃が設定され、運転終了貯湯温度条件として、貯湯温度センサ３９ｂの検出湯温≧４５℃が設定されるものであり、貯湯制御部４０は、まず、目標沸上温度を８０℃とし（ステップＳ１２）、外気温度センサ８で検出される外気温度が第２外気温度としての−５℃より低いか否か判断し（ステップＳ１３）、外気温度が−５℃より低いと判断すると、貯湯温度センサ３９ｂで検出される温度が第１所定温度としての４０℃より低いか否か判断し（ステップＳ１４）、貯湯温度センサ３９ｂで検出される温度が４０℃以上の場合は前記ステップＳ１３の処理に戻り、貯湯温度センサ３９ｂで検出される温度が４０℃より低いと判断すると、圧縮機４を駆動させると共に加熱循環ポンプ１３を駆動させ（ステップＳ１５）、貯湯タンク２内の湯水の沸き上げを開始するものである。 In the second freezing prevention boiling operation, the target boiling temperature is set to 80 ° C. by the setting means 41, and the outside temperature <−5 ° C. is set as the outside start temperature condition for the freeze prevention boiling operation, and the operation is started. The detected hot water temperature of the hot water storage temperature sensor 39b <40 ° C. is set as the hot water storage temperature condition, and the detected hot water temperature of the hot water storage temperature sensor 39b ≧ 45 ° C. is set as the hot water storage temperature condition of the operation. First, the target boiling temperature is set to 80 ° C. (step S12), and it is determined whether or not the outside air temperature detected by the outside air temperature sensor 8 is lower than −5 ° C. as the second outside air temperature (step S13). If it is determined that the temperature is lower than −5 ° C., it is determined whether or not the temperature detected by the hot water storage temperature sensor 39b is lower than 40 ° C. as the first predetermined temperature (step S14), and is detected by the hot water storage temperature sensor 39b. If the temperature is 40 ° C. or higher, the process returns to step S13. If it is determined that the temperature detected by the hot water storage temperature sensor 39b is lower than 40 ° C., the compressor 4 is driven and the heating circulation pump 13 is driven (step S15), boiling of hot water in the hot water storage tank 2 is started.

貯湯タンク２内の湯水の沸き上げが開始されると、熱交出口温度センサ１６で検出される温度が目標沸上温度（ここでは８０℃）より低い場合は、バイパス切替弁１５はバイパス管１４側に切り替えた状態であり、沸き上げた湯水は貯湯タンク２の下部に戻され、熱交出口温度センサ１６で検出される温度が目標沸上温度に到達すると、バイパス切替弁１５をヒーポン戻り管１１ｂ側に切り替え、沸き上げた湯水を貯湯タンク２上部に戻し、貯湯タンク２上部から高温水を貯湯していくものである。 When boiling of hot water in the hot water storage tank 2 is started, if the temperature detected by the heat exchange outlet temperature sensor 16 is lower than the target boiling temperature (80 ° C. in this case), the bypass switching valve 15 is connected to the bypass pipe 14. When the temperature detected by the heat exchange outlet temperature sensor 16 reaches the target boiling temperature, the bypass switching valve 15 is connected to the heat pump return pipe. It switches to 11b side, returns the boiled hot water to the hot water storage tank 2 upper part, and stores hot water from the hot water storage tank 2 upper part.

そして、貯湯制御部４０は、貯湯温度センサ３９ｂの検出する温度が第２所定温度としての４５℃以上であるか否かを判断し（ステップＳ１６）、貯湯温度センサ３９ｂの検出する温度が４５℃以上であると判断すると、圧縮機４を停止させると共に加熱循環ポンプ１３を停止させ、第２凍結予防沸上運転を終了するものである。 And the hot water storage control part 40 judges whether the temperature which the hot water storage temperature sensor 39b detects is 45 degreeC or more as 2nd predetermined temperature (step S16), and the temperature which the hot water storage temperature sensor 39b detects is 45 degreeC If it judges that it is the above, while stopping compressor 4, heating circulation pump 13 is stopped and the 2nd freezing prevention boiling top operation is ended.

以上説明した第２凍結予防沸上運転によれば、風呂循環回路２６に循環できる浴槽水なしの場合に設定手段４１によって設定される第２凍結予防沸上運転の目標沸上温度を、風呂循環回路２６に循環できる浴槽水ありの場合に設定手段４１によって設定される第１凍結予防沸上運転の目標沸上温度よりも高い温度に設定し、貯湯タンク２内の湯水の熱量を増やす方向で凍結を回避する安全側に条件が設定され、風呂循環回路２６に循環できる浴槽水があるときに風呂凍結予防運転で凍結予防に寄与する放熱分を、目標沸上温度を高くして貯湯タンク２内の湯水の熱量を増やすことで補うことができ、貯湯タンクユニット１内の雰囲気温度が上昇し、貯湯タンクユニット１内の配管や主要部品、特に、２点鎖線で囲まれた四角の枠内の配管や主要部品に対する凍結を予防することができるものである。 According to the second freeze prevention boiling operation described above, the target boiling temperature of the second freeze prevention boiling operation set by the setting means 41 when there is no bathtub water that can be circulated to the bath circulation circuit 26 is set to the bath circulation. In the direction of increasing the amount of hot water in the hot water storage tank 2 by setting the temperature higher than the target boiling temperature of the first freeze prevention boiling operation set by the setting means 41 when there is bathtub water that can circulate in the circuit 26. Conditions are set on the safety side to avoid freezing, and when there is bathtub water that can be circulated in the bath circulation circuit 26, the heat release tank contributing to freezing prevention in the bath freezing prevention operation is increased by raising the target boiling temperature 2 It can be compensated by increasing the amount of hot water in the interior, the ambient temperature in the hot water tank unit 1 rises, and the piping and main parts in the hot water tank unit 1, especially in the square frame surrounded by the two-dot chain line Piping and main It is capable of preventing freezing for parts.

次に、図５に示したフローチャートに基づき第３凍結予防沸上運転について説明するが、この第３凍結予防沸上運転は、前記風呂凍結予防運転において、流水スイッチ３０がＯＦＦで流水なしを検出して、風呂循環回路２６に循環できる浴槽水がないことを検出した結果に基づいて設定手段４１が設定した運転条件で行われる凍結予防沸上運転であり、先に説明した第２凍結予防沸上運転とは別の動作を示した実施形態である。 Next, the third freeze prevention boiling operation will be described based on the flowchart shown in FIG. 5. This third freeze prevention boiling operation detects that there is no running water when the flowing water switch 30 is OFF in the bath freezing prevention operation. Then, the second freeze prevention boiling described above is the freeze prevention boiling operation performed under the operation condition set by the setting means 41 based on the detection result that there is no bathtub water that can be circulated in the bath circulation circuit 26. This is an embodiment showing an operation different from the upper operation.

前記第３凍結予防沸上運転では、設定手段４１により目標沸上温度が６５℃に設定され、凍結予防沸上運転の運転開始外気温度条件として、外気温度＜−５℃が設定され、運転開始貯湯温度条件として、貯湯温度センサ３９ｂの検出温度＜４０℃が設定され、運転終了貯湯温度条件として、貯湯温度センサ３９ｄの検出湯温≧４５℃が設定されるものであり、貯湯制御部４０は、まず、目標沸上温度を６５℃とし（ステップＳ１７）、外気温度センサ８で検出される外気温度が第２外気温度としての−５℃より低いか否か判断し（ステップＳ１８）、外気温度が−５℃より低いと判断すると、貯湯温度センサ３９ｂで検出される温度が第１所定温度としての４０℃より低いか否か判断し（ステップＳ１９）、貯湯温度センサ３９ｂで検出される温度が４０℃以上の場合は前記ステップＳ１８の処理に戻り、貯湯温度センサ３９ｂで検出される温度が４０℃より低いと判断すると、圧縮機４を駆動させると共に加熱循環ポンプ１３を駆動させ（ステップＳ２０）、貯湯タンク２内の湯水の沸き上げを開始するものである。 In the third freeze prevention boiling operation, the target boiling temperature is set to 65 ° C. by the setting means 41, and the outside temperature <−5 ° C. is set as the operation start outside temperature condition of the freeze prevention boiling operation, and the operation is started. The detection temperature of the hot water storage temperature sensor 39b <40 ° C. is set as the hot water storage temperature condition, and the detection hot water temperature of the hot water storage temperature sensor 39d ≧ 45 ° C. is set as the operation hot water storage temperature condition. First, the target boiling temperature is set to 65 ° C. (step S17), and it is determined whether or not the outside temperature detected by the outside temperature sensor 8 is lower than −5 ° C. as the second outside temperature (step S18). Is determined to be lower than −5 ° C., it is determined whether or not the temperature detected by the hot water storage temperature sensor 39b is lower than 40 ° C. as the first predetermined temperature (step S19), and is detected by the hot water storage temperature sensor 39b. If the temperature is 40 ° C. or higher, the process returns to step S18. If it is determined that the temperature detected by the hot water storage temperature sensor 39b is lower than 40 ° C., the compressor 4 is driven and the heating circulation pump 13 is driven (step S20), boiling of hot water in the hot water storage tank 2 is started.

そして、貯湯制御部４０は、貯湯温度センサ３９ｄの検出する温度が第２所定温度としての４５℃以上であるか否かを判断し（ステップＳ２１）、貯湯温度センサ３９ｄの検出する温度が４５℃以上であると判断すると、圧縮機４を停止させると共に加熱循環ポンプ１３を停止させ、第３凍結予防沸上運転を終了するものである。 And the hot water storage control part 40 judges whether the temperature which the hot water storage temperature sensor 39d detects is 45 degreeC or more as 2nd predetermined temperature (step S21), and the temperature which the hot water storage temperature sensor 39d detects is 45 degreeC If it judges that it is above, while stopping compressor 4, heating circulation pump 13 is stopped and the 3rd freezing prevention boiling top operation is ended.

以上説明した第３凍結予防沸上運転によれば、凍結予防沸上運転の運転終了貯湯温度条件の温度は、第２所定温度（ここでは４５℃）で変更せず、風呂循環回路２６に循環できる浴槽水なしの場合に設定手段４１によって設定される第３凍結予防沸上運転の運転終了貯湯温度条件を判断する貯湯温度センサ３９を、風呂循環回路２６に循環できる浴槽水ありの場合に設定手段４１によって設定される第１凍結予防沸上運転の運転終了貯湯温度条件を判断する第１貯湯温度検出手段としての貯湯温度センサ３９ｂよりも下方に位置する第２貯湯温度検出手段としての貯湯温度センサ３９ｄとしたことにより、第３凍結予防沸上運転の方が第１凍結予防沸上運転よりも貯湯タンク２内の湯水の沸き上げ量が増え、貯湯タンク２内の湯水の熱量を増やす方向で凍結を回避する安全側に条件が設定され、風呂循環回路２６に循環できる浴槽水があるときに風呂凍結予防運転で凍結予防に寄与する放熱分を、沸き上げ量を多くして貯湯タンク２内の湯水の熱量を増やすことで補うことができ、貯湯タンクユニット１内の雰囲気温度が上昇し、貯湯タンクユニット１内の配管や主要部品、特に、２点鎖線で囲まれた四角の枠内の配管や主要部品に対する凍結を予防することができるものである。 According to the third freeze prevention boiling operation described above, the temperature of the hot water storage temperature condition at the end of the freeze prevention boiling operation is not changed at the second predetermined temperature (here, 45 ° C.) and circulates in the bath circulation circuit 26. The hot water storage temperature sensor 39 for determining the hot water storage temperature condition for the end of the third freeze-preventing boiling operation set by the setting means 41 when there is no bathtub water that can be set is set when there is bathtub water that can be circulated to the bath circulation circuit 26. The hot water storage temperature as the second hot water storage temperature detection means located below the hot water storage temperature sensor 39b as the first hot water storage temperature detection means for judging the operation end hot water storage temperature condition set by the means 41. By using the sensor 39d, the amount of boiling water in the hot water storage tank 2 increases in the third freezing prevention boiling operation and the amount of hot water in the hot water storage tank 2 increases compared to the first freezing prevention boiling operation. When there is bath water that can be circulated in the bath circulation circuit 26, the heat radiation that contributes to freezing prevention in the bath freezing prevention operation is increased by increasing the amount of boiling and the hot water storage. It can be compensated by increasing the amount of hot water in the tank 2, the ambient temperature in the hot water tank unit 1 rises, and the piping and main parts in the hot water tank unit 1, especially the square surrounded by a two-dot chain line It is possible to prevent freezing of piping and main parts in the frame.

次に、図６に示したフローチャートに基づき第４凍結予防沸上運転について説明するが、この第４凍結予防沸上運転は、前記風呂凍結予防運転において、流水スイッチ３０がＯＦＦで流水なしを検出して、風呂循環回路２６に循環できる浴槽水がないことを検出した結果に基づいて設定手段４１が設定した運転条件で行われる凍結予防沸上運転であり、先に説明した第２凍結予防沸上運転および第３凍結予防沸上運転とは別の動作を示した実施形態である。 Next, the fourth freeze prevention boiling operation will be described based on the flowchart shown in FIG. 6. This fourth freeze prevention boiling operation detects that there is no running water when the flowing water switch 30 is OFF in the bath freezing prevention operation. Then, the second freeze prevention boiling described above is the freeze prevention boiling operation performed under the operation condition set by the setting means 41 based on the detection result that there is no bathtub water that can be circulated in the bath circulation circuit 26. This is an embodiment showing an operation different from the upper operation and the third freeze prevention boiling operation.

前記第４凍結予防沸上運転では、設定手段４１により目標沸上温度が６５℃に設定され、凍結予防沸上運転の運転開始外気温度条件として、外気温度＜−３℃が設定され、運転開始貯湯温度条件として、貯湯温度センサ３９ｂの検出温度＜４０℃が設定され、運転終了貯湯温度条件として、貯湯温度センサ３９ｂの検出湯温≧４５℃が設定されるものであり、貯湯制御部４０は、まず、目標沸上温度を６５℃とし（ステップＳ２２）、外気温度センサ８で検出される外気温度が第３外気温度としての−３℃より低いか否か判断し（ステップＳ２３）、外気温度が−３℃より低いと判断すると、貯湯温度センサ３９ｂで検出される温度が第１所定温度としての４０℃より低いか否か判断し（ステップＳ２４）、貯湯温度センサ３９ｂで検出される温度が４０℃以上の場合は前記ステップＳ２３の処理に戻り、貯湯温度センサ３９ｂで検出される温度が４０℃より低いと判断すると、圧縮機４を駆動させると共に加熱循環ポンプ１３を駆動させ（ステップＳ２５）、貯湯タンク２内の湯水の沸き上げを開始するものである。 In the fourth freeze prevention boiling operation, the target boiling temperature is set to 65 ° C. by the setting means 41, and the outside temperature <−3 ° C. is set as the outside start temperature condition for the freeze prevention boiling operation, and the operation is started. The detection temperature of the hot water storage temperature sensor 39b <40 ° C. is set as the hot water storage temperature condition, and the detection hot water temperature of the hot water storage temperature sensor 39b ≧ 45 ° C. is set as the operation hot water storage temperature condition. First, the target boiling temperature is set to 65 ° C. (step S22), and it is determined whether or not the outside temperature detected by the outside temperature sensor 8 is lower than −3 ° C. as the third outside temperature (step S23). Is determined to be lower than −3 ° C., it is determined whether or not the temperature detected by the hot water storage temperature sensor 39b is lower than 40 ° C. as the first predetermined temperature (step S24), and is detected by the hot water storage temperature sensor 39b. If the temperature is 40 ° C. or higher, the process returns to step S23. If it is determined that the temperature detected by the hot water storage temperature sensor 39b is lower than 40 ° C., the compressor 4 is driven and the heating circulation pump 13 is driven (step S25), boiling of hot water in the hot water storage tank 2 is started.

そして、貯湯制御部４０は、貯湯温度センサ３９ｂの検出する温度が第２所定温度としての４５℃以上であるか否かを判断し（ステップＳ２６）、貯湯温度センサ３９ｂの検出する温度が４５℃以上であると判断すると、圧縮機４を停止させると共に加熱循環ポンプ１３を停止させ、第４凍結予防沸上運転を終了するものである。 And the hot water storage control part 40 judges whether the temperature which the hot water storage temperature sensor 39b detects is 45 degreeC or more as 2nd predetermined temperature (step S26), and the temperature which the hot water storage temperature sensor 39b detects is 45 degreeC If it is judged as above, the compressor 4 is stopped and the heating circulation pump 13 is stopped, and the fourth freeze prevention boiling-up operation is ended.

以上説明した第４凍結予防沸上運転によれば、風呂循環回路２６に循環できる浴槽水なしの場合に設定手段４１によって設定される第４凍結予防沸上運転の運転条件としての運転開始外気温度条件を、風呂循環回路２６に循環できる浴槽水ありの場合に設定手段４１で設定される第１凍結予防沸上運転の運転開始外気温度条件よりも高い温度に設定（第２外気温度＜第３外気温度）、すなわち凍結予防沸上運転の運転開始を早めるように設定したことで、貯湯タンク２内の湯量が少ない、すなわち貯湯温度センサ３９ｂで検出される温度が４０℃より低い状態となっているときに、第４凍結予防沸上運転の方が第１凍結予防沸上運転よりも凍結予防沸上運転の開始が早くなるので、凍結を回避する安全側に条件が設定され、早めに貯湯タンクユニット１内の雰囲気温度を上昇させて、貯湯タンクユニット１内の配管や主要部品、特に、２点鎖線で囲まれた四角の枠内の配管や主要部品に対する凍結を予防することができるものである。 According to the above-described fourth freeze prevention boiling operation, the operation start outside air temperature as the operation condition of the fourth freeze prevention boiling operation set by the setting means 41 when there is no bathtub water that can be circulated to the bath circulation circuit 26. The condition is set to a temperature higher than the operation start outside air temperature condition of the first freeze prevention boiling-up operation set by the setting means 41 when there is bathtub water that can be circulated to the bath circulation circuit 26 (second outside air temperature <third (Outside air temperature), that is, by setting so as to accelerate the start of the freeze prevention boiling operation, the amount of hot water in the hot water storage tank 2 is small, that is, the temperature detected by the hot water temperature sensor 39b is lower than 40 ° C. In the fourth freeze prevention boiling operation, the start of the freeze prevention boiling operation is earlier than in the first freeze prevention boiling operation, so conditions are set on the safe side to avoid freezing and hot water is stored earlier. tank By increasing the ambient temperature in the knit 1, it is possible to prevent freezing of piping and main parts in the hot water storage tank unit 1, particularly piping and main parts in a square frame surrounded by a two-dot chain line. is there.

次に、図７に示したフローチャートに基づき第５凍結予防沸上運転について説明するが、この第５凍結予防沸上運転は、前記風呂凍結予防運転において、流水スイッチ３０がＯＦＦで流水なしを検出して、風呂循環回路２６に循環できる浴槽水がないことを検出した結果に基づいて設定手段４１が設定した運転条件で行われる凍結予防沸上運転であり、先に説明した第２凍結予防沸上運転、第３凍結予防沸上運転、第４凍結予防沸上運転とは別の動作を示した実施形態である。 Next, the fifth freeze-prevention boiling operation will be described based on the flowchart shown in FIG. 7. This fifth freeze-prevention boiling operation detects that there is no running water when the running water switch 30 is OFF in the bath freezing prevention operation. Then, the second freeze prevention boiling described above is the freeze prevention boiling operation performed under the operation condition set by the setting means 41 based on the detection result that there is no bathtub water that can be circulated in the bath circulation circuit 26. This is an embodiment showing operations different from the upper operation, the third freeze prevention boiling operation, and the fourth freeze prevention boiling operation.

前記第５凍結予防沸上運転では、設定手段４１により目標沸上温度が６５℃に設定され、凍結予防沸上運転の運転開始外気温度条件として、外気温度＜−５℃が設定され、運転開始貯湯温度条件として、貯湯温度センサ３９ｄの検出温度＜４０℃が設定され、運転終了貯湯温度条件として、貯湯温度センサ３９ｄの検出温度≧４５℃が設定されるものであり、貯湯制御部４０は、まず、目標沸上温度を６５℃とし（ステップＳ２７）、外気温度センサ８で検出される外気温度が第２外気温度としての−５℃より低いか否か判断し（ステップＳ２８）、外気温度が−５℃より低いと判断すると、貯湯温度センサ３９ｄで検出される温度が第１所定温度としての４０℃より低いか否か判断し（ステップＳ２９）、貯湯温度センサ３９ｄで検出される温度が４０℃以上の場合は前記ステップＳ２８の処理に戻り、貯湯温度センサ３９ｄで検出される温度が４０℃より低いと判断すると、圧縮機４を駆動させると共に加熱循環ポンプ１３を駆動させ（ステップＳ３０）、貯湯タンク２内の湯水の沸き上げを開始するものである。 In the fifth freezing prevention boiling operation, the target boiling temperature is set to 65 ° C. by the setting means 41, the outside temperature <−5 ° C. is set as the outside air temperature condition for starting the freezing prevention boiling operation, and the operation is started. The detection temperature of the hot water storage temperature sensor 39d <40 ° C. is set as the hot water storage temperature condition, and the detection temperature of the hot water storage temperature sensor 39d ≧ 45 ° C. is set as the operation hot water storage temperature condition. First, the target boiling temperature is set to 65 ° C. (step S27), and it is determined whether or not the outside air temperature detected by the outside air temperature sensor 8 is lower than −5 ° C. as the second outside air temperature (step S28). If it is determined that the temperature is lower than −5 ° C., it is determined whether or not the temperature detected by the hot water storage temperature sensor 39d is lower than 40 ° C. as the first predetermined temperature (step S29), and is detected by the hot water storage temperature sensor 39d. When the temperature is 40 ° C. or higher, the process returns to step S28. When it is determined that the temperature detected by the hot water storage temperature sensor 39d is lower than 40 ° C., the compressor 4 is driven and the heating circulation pump 13 is driven (step S30), boiling of hot water in the hot water storage tank 2 is started.

そして、貯湯制御部４０は、貯湯温度センサ３９ｄの検出する温度が第２所定温度としての４５℃以上であるか否かを判断し（ステップＳ３１）、貯湯温度センサ３９ｄの検出する温度が４５℃以上であると判断すると、圧縮機４を停止させると共に加熱循環ポンプ１３を停止させ、第５凍結予防沸上運転を終了するものである。 And the hot water storage control part 40 judges whether the temperature which the hot water storage temperature sensor 39d detects is 45 degreeC or more as 2nd predetermined temperature (step S31), and the temperature which the hot water storage temperature sensor 39d detects is 45 degreeC If it judges that it is the above, the compressor 4 will be stopped, the heating circulation pump 13 will be stopped, and the 5th freezing prevention boiling operation will be complete | finished.

以上説明した第５凍結予防沸上運転によれば、凍結予防沸上運転の運転開始貯湯温度条件の温度は、第１所定温度（ここでは４０℃）で変更せず、風呂循環回路２６に循環できる浴槽水なしの場合に設定手段４１によって設定される第５凍結予防沸上運転の運転開始貯湯温度条件を判断する貯湯温度センサ３９を、風呂循環回路２６に循環できる浴槽水ありの場合に設定手段４１によって設定される第１凍結予防沸上運転の運転開始貯湯温度条件を判断する第１貯湯温度検出手段としての貯湯温度センサ３９ｂよりも下方に位置する第２貯湯温度検出手段としての貯湯温度センサ３９ｄとしたことにより、貯湯タンク２内の湯水の温度分布から貯湯タンク２内の下方に向かうほど貯湯されている湯水の温度は低く、運転開始貯湯温度条件が成立しやすい方向となり、第５凍結予防沸上運転の運転開始貯湯温度条件が第１凍結予防沸上運転の運転開始貯湯温度条件よりも緩く設定、すなわち、凍結予防沸上運転の運転開始を早めるように凍結を回避する安全側に条件が設定され、第５凍結予防沸上運転の方が第１凍結予防沸上運転よりも凍結予防沸上運転の開始が早くなるので、早めに貯湯タンクユニット１内の雰囲気温度を上昇させて、貯湯タンクユニット１内の配管や主要部品、特に、２点鎖線で囲まれた四角の枠内の配管や主要部品に対する凍結を予防することができるものである。 According to the fifth freeze prevention boiling operation described above, the temperature of the operation start hot water storage temperature condition for the freeze prevention boiling operation is not changed at the first predetermined temperature (here, 40 ° C.) and circulates in the bath circulation circuit 26. The hot water storage temperature sensor 39 for determining the operation start hot water storage temperature condition set by the setting means 41 when there is no bathtub water that can be set is set when there is bathtub water that can be circulated to the bath circulation circuit 26. The hot water storage temperature as the second hot water storage temperature detection means positioned below the hot water storage temperature sensor 39b as the first hot water storage temperature detection means for judging the operation start hot water storage temperature condition of the first freeze prevention boiling operation set by the means 41. By using the sensor 39d, the temperature of the hot water stored in the hot water storage tank 2 decreases from the temperature distribution of the hot water in the hot water storage tank 2 toward the lower side of the hot water storage tank 2, so that the operation start hot water storage temperature condition is satisfied. So that the temperature at the start of hot water storage in the fifth freeze-prevention boiling operation is set to be lower than the temperature at the start of hot water storage in the first freeze-prevention boiling operation, that is, the start of operation in the freeze-free boiling operation is accelerated. Since the conditions are set on the safety side to avoid freezing and the start of the freeze-prevention boiling operation is earlier than that of the first freeze-prevention boiling operation, the hot water storage tank unit 1 is earlier. It is possible to prevent the freezing of the piping and main components in the hot water storage tank unit 1, particularly the piping and main components in the square frame surrounded by the two-dot chain line by raising the ambient temperature inside.

なお、本発明は先に説明した一実施形態に限定されるものでなく、本実施形態では、風呂循環回路２６に循環できる浴槽水の有無を検出する検出手段として流水スイッチ３０を用いたが、風呂循環回路２６に検出手段としての水位センサを設け、水位センサにより浴槽水の水圧から浴槽２５内の浴槽水の水位を検出することで風呂循環回路２６に循環できる浴槽水の有無を検出するようにしてもよく、水位センサを用いる場合は、風呂凍結防止運転時に限らず、随時浴槽２５内の水位を監視して浴槽水の有無を検出するようにし、その結果に基づいて設定手段４１が凍結予防沸上運転の運転条件を設定するようにしてもよいものである。また、風呂循環ポンプ２９を駆動させてその回転数により、通常使用する回転数の範囲内であれば浴槽水あり、通常使用しない異常な高回転数であれば空回りしていると判断し浴槽水なしと検出するような検出手段を備え、風呂循環回路２６に循環できる浴槽水の有無を検出するようにしてもよいものであり、特に限定されるものではない。 The present invention is not limited to the above-described embodiment, and in this embodiment, the water flow switch 30 is used as a detection means for detecting the presence or absence of bathtub water that can be circulated in the bath circulation circuit 26. A water level sensor as a detecting means is provided in the bath circulation circuit 26, and the presence or absence of bathtub water that can be circulated to the bath circulation circuit 26 is detected by detecting the water level of the bathtub water in the bathtub 25 from the water pressure of the bathtub water by the water level sensor. In the case of using the water level sensor, not only during the bath freezing prevention operation, the water level in the bathtub 25 is monitored at any time to detect the presence or absence of the bath water, and the setting means 41 is frozen based on the result. The operating conditions for the preventive boiling operation may be set. Further, the bath circulation pump 29 is driven and the number of rotations thereof determines that there is bathtub water if it is within the range of rotations that are normally used, and that the bath water is determined to be idle if it is an abnormally high rotation number that is not normally used. It is possible to detect the presence or absence of bathtub water that can be circulated in the bath circulation circuit 26, and is not particularly limited.

また、本実施形態では、風呂凍結予防運転の運転開始外気温度条件（外気温度＜３℃）を、凍結予防沸上運転の運転開始外気温度条件（外気温度＜−５℃または外気温度＜−３℃）よりも緩い条件としているため、必ず風呂凍結予防運転が凍結予防沸上運転よりも先に運転が始まることになり、設定手段４１は確実に浴槽水の有無に基づいた凍結予防沸上運転の運転条件を設定できるものである。 In this embodiment, the operation start outside air temperature condition (outside air temperature <3 ° C.) for the bath freezing prevention operation is changed to the operation start outside air temperature condition (outside air temperature <−5 ° C. or outside air temperature <−3 ° C.). Therefore, the bath freezing prevention operation always starts before the freezing prevention boiling operation, and the setting means 41 surely performs the freezing prevention boiling operation based on the presence or absence of bath water. The operating conditions can be set.

また、本実施形態では、制御手段としてヒーポン制御部９と貯湯制御部４０の２つを備え、ヒーポン制御部９がヒートポンプ式加熱手段３側の制御を、貯湯制御部４０が貯湯タンクユニット１側の制御を行うものとしたが、ヒーポン制御部９と貯湯制御部４０とを１つの制御手段として、貯湯タンクユニット１側およびヒートポンプ式加熱手段３側の双方の制御を行うようにしてもよいものである。 In the present embodiment, two control units, a heat pump control unit 9 and a hot water storage control unit 40, are provided. The heat pump control unit 9 controls the heat pump heating means 3 and the hot water control unit 40 controls the hot water tank unit 1 side. However, the heat pump control unit 9 and the hot water storage control unit 40 may be used as one control means to control both the hot water tank unit 1 side and the heat pump heating means 3 side. It is.

１貯湯タンクユニット
２貯湯タンク
３ヒートポンプ式加熱手段
８外気温度センサ
９ヒーポン制御部
１２加熱循環回路
１３加熱循環ポンプ
２４風呂熱交換器
２５浴槽
２６風呂循環回路
２９風呂循環ポンプ
３０流水スイッチ
３９貯湯温度センサ
４０貯湯制御部
４１設定手段 DESCRIPTION OF SYMBOLS 1 Hot water storage tank unit 2 Hot water storage tank 3 Heat pump type heating means 8 Outside air temperature sensor 9 Heat pump control part 12 Heating circulation circuit 13 Heating circulation pump 24 Bath heat exchanger 25 Bathtub 26 Bath circulation circuit 29 Bath circulation pump 30 Flow switch 39 Hot water temperature sensor 40 Hot water storage control unit 41 Setting means

Claims

湯水を貯湯する貯湯タンクを有する貯湯タンクユニットと、前記貯湯タンク下部から取り出した湯水を前記貯湯タンク上部に戻す加熱循環回路と、該加熱循環回路の途中に設けられ湯水を加熱する加熱手段と、前記加熱循環回路の途中に設けられ前記貯湯タンク内の湯水を前記加熱循環回路に循環させる加熱循環ポンプと、前記貯湯タンク内の湯水の温度を検出する貯湯温度検出手段と、外気温度を検出する外気温度検出手段と、前記貯湯タンク内の湯水を熱源として浴槽水を加熱する風呂熱交換器と、浴槽と前記風呂熱交換器とを接続した風呂循環回路と、該風呂循環回路に設けられ浴槽水を循環させる風呂循環ポンプと、浴槽水の有無を検出する検出手段と、これらの作動を制御する制御手段とを備え、前記制御手段は、前記外気温度検出手段で検出される外気温度が低く、かつ、前記貯湯温度検出手段で検出される湯水の温度が低いときに、前記加熱手段により前記貯湯タンク内の湯水を所定の目標沸上温度で沸き上げる凍結予防沸上運転を行わせるようにした貯湯式給湯風呂装置において、前記検出手段の検出する浴槽水の有無に基づいて、前記凍結予防沸上運転の運転条件としての前記所定の目標沸上温度、運転開始外気温度条件、運転開始貯湯温度条件、運転終了貯湯温度条件を設定する設定手段を設け、該設定手段は、前記検出手段が浴槽水ありを検出したときよりも、前記検出手段が浴槽水なしを検出したときの方が、前記凍結予防沸上運転の前記運転条件のうち少なくとも一つを凍結を回避する安全側に設定するようにしたことを特徴とする貯湯式給湯風呂装置。 A hot water storage tank unit having a hot water storage tank for storing hot water, a heating circulation circuit for returning the hot water taken out from the lower part of the hot water storage tank to the upper part of the hot water storage tank, a heating means provided in the middle of the heating circulation circuit for heating the hot water, A heating circulation pump provided in the middle of the heating circulation circuit for circulating hot water in the hot water storage tank to the heating circulation circuit, hot water storage temperature detecting means for detecting the temperature of the hot water in the hot water storage tank, and detecting the outside air temperature. Outside air temperature detection means, a bath heat exchanger that heats bathtub water using hot water in the hot water storage tank as a heat source, a bath circulation circuit that connects the bathtub and the bath heat exchanger, and a bath provided in the bath circulation circuit A bath circulation pump for circulating water, a detection means for detecting the presence or absence of bath water, and a control means for controlling the operation thereof, wherein the control means is configured to detect the outside air temperature. When the outside air temperature detected by the means is low and the temperature of the hot water detected by the hot water storage temperature detection means is low, the heating means freezes the hot water in the hot water tank at a predetermined target boiling temperature. In the hot water storage hot water bath apparatus configured to perform the preventive boiling operation, based on the presence or absence of bath water detected by the detection means, the predetermined target boiling temperature as the operation condition of the freeze prevention boiling operation, Setting means for setting an operation start outside air temperature condition, an operation start hot water storage temperature condition, and an operation end hot water storage temperature condition is provided, and the setting means detects the presence of bathtub water rather than when the detection means detects the presence of bath water. The hot water storage hot water bath apparatus is characterized in that at least one of the operating conditions of the freeze-preventing boiling operation is set to a safe side to avoid freezing when none is detected

前記設定手段は、前記検出手段が浴槽水ありを検出したときよりも、前記検出手段が浴槽水なしを検出したときの方が、前記貯湯タンク内の湯水の熱量を増やすように前記凍結予防沸上運転の前記運転条件を設定するようにしたことを特徴とする請求項１記載の貯湯式給湯風呂装置。 The setting means is configured to increase the amount of hot water in the hot water storage tank when the detecting means detects that there is no bath water, rather than when the detecting means detects that there is bath water. The hot water storage hot water bath apparatus according to claim 1, wherein the operation condition for the upper operation is set.

前記設定手段は、前記検出手段が浴槽水ありを検出したときよりも、前記検出手段が浴槽水なしを検出したときの方が、前記凍結予防沸上運転の運転開始を早めるように前記凍結予防沸上運転の前記運転条件を設定するようにしたことを特徴とする請求項１記載の貯湯式給湯風呂装置。 The setting means prevents the freeze prevention so that the start of the freeze prevention boiling operation is accelerated when the detection means detects no bath water than when the detection means detects the presence of bath water. 2. The hot water storage hot water bath apparatus according to claim 1, wherein the operating condition of the boiling operation is set.

前記設定手段は、前記検出手段が浴槽水ありを検出したときよりも、前記検出手段が浴槽水なしを検出したときの方が、前記所定の目標沸上温度が高くなるように前記運転条件を設定するようにしたことを特徴とする請求項２記載の貯湯式給湯風呂装置。 The setting means sets the operating condition so that the predetermined target boiling temperature is higher when the detection means detects no bath water than when the detection means detects the presence of bath water. The hot water storage hot water bath apparatus according to claim 2, wherein the hot water storage hot water bath apparatus is set.

前記貯湯温度検出手段は前記貯湯タンク側面の上下方向に複数個配置され、前記検出手段が浴槽水なしを検出したときに前記設定手段によって設定される前記凍結予防沸上運転の前記運転終了貯湯温度条件を判断する前記貯湯温度検出手段を、前記検出手段が浴槽水ありを検出したときに前記設定手段によって設定される前記凍結予防沸上運転の前記運転終了貯湯温度条件を判断する前記貯湯温度検出手段よりも下方に位置する前記貯湯温度検出手段としたことを特徴とする請求項２記載の貯湯式給湯風呂装置。 A plurality of hot water storage temperature detection means are arranged in the vertical direction of the hot water tank side surface, and the operation end hot water storage temperature of the freeze prevention boiling operation set by the setting means when the detection means detects the absence of bath water. The hot water storage temperature detection means for determining the condition, the hot water storage temperature detection for determining the operation end hot water storage temperature condition of the freeze-preventing boiling operation set by the setting means when the detection means detects the presence of bath water The hot water storage hot water bath apparatus according to claim 2, wherein the hot water storage temperature detecting means is located below the means.

前記検出手段が浴槽水なしを検出したときに前記設定手段によって設定される前記凍結予防沸上運転の前記運転開始外気温度条件を、前記検出手段が浴槽水ありを検出したときに前記設定手段によって設定される前記凍結予防沸上運転の前記運転開始外気温度条件よりも高い温度に設定するようにしたことを特徴とする請求項３記載の貯湯式給湯風呂装置。 The operation start outside air temperature condition of the freeze-preventing boiling-up operation set by the setting unit when the detection unit detects the absence of bath water is set by the setting unit when the detection unit detects presence of bath water. 4. The hot water storage hot water bath apparatus according to claim 3, wherein the temperature is set to be higher than the operation start outside air temperature condition of the set freeze-prevention boiling operation.

前記貯湯温度検出手段は前記貯湯タンク側面の上下方向に複数個配置され、前記検出手段が浴槽水なしを検出したときに前記設定手段によって設定される前記凍結予防沸上運転の前記運転開始貯湯温度条件を判断する前記貯湯温度検出手段を、前記検出手段が浴槽水ありを検出したときに前記設定手段によって設定される前記凍結予防沸上運転の前記運転開始貯湯温度条件を判断する前記貯湯温度検出手段よりも下方に位置する前記貯湯温度検出手段としたことを特徴とする請求項３記載の貯湯式給湯風呂装置。 A plurality of hot water storage temperature detection means are arranged in the vertical direction of the hot water storage tank side surface, and the operation start hot water storage temperature of the freeze prevention boiling operation set by the setting means when the detection means detects no bath water. The hot water storage temperature detection means for determining the condition, the hot water storage temperature detection for determining the operation hot water storage temperature condition of the freeze-preventing boiling-up operation set by the setting means when the detection means detects the presence of bath water 4. The hot water storage hot water bath apparatus according to claim 3, wherein the hot water storage temperature detecting means is located below the means.