JP2015094516A - Hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply device capable of determining whether or not a pipeline between a boiling-up circuit and a heating part is in a reverse connection state, while achieving shortening of time required for a test operation.SOLUTION: In a control unit 100, a hot water filling test operation and a reverse connection determination in which whether or not a pipeline between a boiling-up circuit 12 and a heat pump unit 13 is in a reverse connection state is determined are executed in parallel. Furthermore, during the execution of water level confirmation processing of the hot water filing test operation in which a fluid for heat storage and water for hot water supply do not substantially exchange heat in a bath heat exchanger 42, the control unit 100 operates a bath primary pump 44, which is flow rate adjustment means, and determines whether or not the pipeline between the boiling-up circuit 12 and the heat pump unit 13 is in a reverse connection state.

Description

  The present invention relates to a hot water supply apparatus that heats up a heat storage fluid stored in a tank by a heating unit.

  Conventionally, in a hot water supply apparatus that boiles water (heat storage fluid) stored in a tank with a heat pump unit (heating unit), the water taken out from the lower part of the tank is heated to a predetermined temperature by the heat pump unit and returned to the upper part of the tank. It has a boiling circuit. This elevating circuit has an elevating piping for connecting the lower part of the tank to the inlet pipe of the heat pump unit, and a return pipe for elevating the upper part of the tank connected to the outlet pipe of the heat pump unit. The hot water stored in the tank is taken out from the upper part of the tank and used as a heating source for hot water for use on the heat load side.

  Here, when connecting the elevating circuit to the heat pump unit, such as when installing a hot water supply device, the elevating circuit side piping (boiling egress piping and elevating return piping) and the heat pump unit side piping ( In some cases, the inlet pipe and the outlet pipe) are connected in reverse.

  When such a reverse connection of piping occurs, when a boiling operation is performed in which the water stored in the tank is boiled by the heat pump unit, the water taken out from the upper part of the tank is heated to a predetermined temperature by the heat pump unit. Will return to the bottom of That is, the hot water returned to the lower portion of the tank only warms the water in the entire tank, and the hot water having a desired temperature cannot be taken out from the upper portion of the tank.

  In order to eliminate such problems, for example, Patent Document 1 proposes a method of detecting a reverse connection state of piping between a boiling circuit and a heating unit (heat pump unit).

  In the determination of the reverse connection proposed in Patent Document 1, after the trial operation of the boiling operation, the heat on the heat load side is used so that the water on the upper side of the tank tracks the water in the bathtub. Set the path to flow in the order of exchanger → heat pump unit → forward piping for boiling → lower part of tank. And if the water temperature in the inlet pipe of the heat pump unit when the circulation pump provided in the circuit on the heat load side is circulated and the water on the upper side of the tank is circulated in the above-described path is not higher than the boiling temperature, It is determined that the connection is reverse.

  When the piping between the boiling circuit and the heat pump unit is in a normal connection state, water that has been heated to the boiling temperature or higher by the heat pump unit flows into the inlet piping of the heat pump unit. That is, the water temperature of the inlet pipe of the heat pump unit rises above the boiling temperature.

  On the other hand, if the piping between the boiling circuit and the heat pump unit is reversely connected, the water before passing through the heat pump unit flows into the inlet piping of the heat pump unit, and the water temperature in the inlet piping of the heat pump unit Does not exceed the temperature.

Japanese Patent No. 5133773

  By the way, in the trial operation performed at the time of installation of the hot water supply device, in addition to the determination of the reverse connection performed after the boiling operation, the hot water filling operation in which the water that has passed through the heat exchanger for heat load is stored in the bathtub is performed. If these are performed individually, it takes a long time to complete the trial run. In Patent Literature 1, reverse connection determination is performed after the boiling operation is completed, and the hot water operation is not particularly taken into consideration.

  Therefore, the present inventors diligently studied to shorten the time for trial operation of the hot water supply apparatus, and found that it takes a long time for reverse connection determination and hot water filling operation in the trial operation. Focusing on this point, the present inventors considered performing hot water filling operation (hot water filling test operation) and reverse connection determination in parallel in the test operation.

  However, when the reverse connection determination proposed in Patent Document 1 is performed in parallel with the hot water filling test operation, it may not be possible to determine whether or not the reverse connection state is established. As the cause, when the reverse connection determination is performed in parallel with the hot water filling test operation, the water from the upper side of the tank is cooled by exchanging heat with the water supplied to the bathtub in the heat load heat exchanger, In connection with this, the temperature of the water flowing through the inlet pipe of the heat pump unit may be lowered.

  In other words, even if the piping connection between the boiling circuit and the heat pump unit is in a normal connection state, water below the boiling temperature may flow into the inlet piping of the heat pump unit. If it is determined that the connection is reverse, the wrong determination is made.

  An object of the present invention is to provide a hot water supply apparatus capable of determining whether or not a piping connection between a boiling circuit and a heating unit is in a reverse connection state while shortening the time required for a test operation. To do.

  In order to achieve the above object, according to the first aspect of the present invention, the tank (11) for storing the heat storage fluid therein and the heat storage fluid introduced from the inlet pipe (36) to heat the outlet pipe (37) A heating section (13) led out from the tank, a forward piping (31) for connecting the lower part of the tank and the inlet pipe, a return pipe (32) for raising, which connects the upper part of the tank and the outlet pipe, and the inlet Passing through the elevating circuit (12) having the elevating pump (33) for flowing the heat storage fluid in the order of piping → heating unit → outlet piping, the extraction piping (41) connected to the elevating return piping, and the extraction piping The heat storage fluid (42) for exchanging heat with the hot water used on the heat load side, and the intake pipe (43 for returning the heat storage fluid that has passed through the heat load heat exchanger to the tank) ) And a hot water supply water is supplied. Bathtub introduction pipe (82) for introducing hot water supply water that has passed through the heat load heat exchanger to the tank (51), and a bathtub for supplying hot water supply water that has passed through the heat load heat exchanger to the bathtub via the bathtub introduction pipe A bath circuit (70, 80) having a supply means (71, 84), a flow rate adjusting means (26, 34, 44) for adjusting the flow rate of the heat storage fluid flowing from the return pipe for boiling to the extraction pipe, First temperature detection means (45) for detecting the temperature of the heat storage fluid passing through the inlet pipe, second temperature detection means (13a) for detecting the temperature of the heat storage fluid passing through the inlet pipe, a heating unit, and The outlet pipe is connected to the operation control means (100a) for operating the elevating pump and operating the bathtub supply means to supply hot water supply water to the bathtub, and the elevating forward pipe. In addition, the inlet is arranged in the return pipe for boiling. But provided with a reverse connection determination means (100b) determines whether the reverse connection state of being connected.

  The operation control means executes a water level confirmation process for stopping the operation of the bathtub supply means and confirming a change in the water level of the bathtub relative to the amount of hot water supply to the bathtub during the hot water filling test operation. During the confirmation process, the flow rate adjusting means is controlled so that the heat storage fluid flows from the boiling return pipe to the extraction pipe, and the reverse connection determination means detects the first temperature during the water level confirmation process by the operation control means. If the difference between the detected value of the means and the detected value of the second temperature detecting means is smaller than a predetermined determination threshold value, the reverse connection state is determined.

  According to this, the hot water test operation and the reverse connection determination are performed separately by executing the hot water test operation and the reverse connection determination for determining whether or not the piping between the heating circuit and the heating unit is in the reverse connection state in parallel. Compared with the case where it carries out to this, time required for the test operation of the hot water supply apparatus can be shortened.

  In addition, when the piping between the boiling circuit and the heating unit is in a normally connected state, during the water level confirmation process of the hot water filling test operation, heat storage is performed by controlling the heating unit, the boiling pump, and the flow rate adjusting means. The working fluid flows as follows. That is, the heat storage fluid in the lower part of the tank flows in the order of boiling forward piping → inlet piping → heating section → outlet piping → return heating piping → extraction piping → heat exchanger for heat load → intake piping → tank . At this time, since the heat storage fluid that has been heated in the heating section passes through the intake pipe, the temperature of the heat storage fluid that passes through the intake pipe is equal to the temperature of the heat storage fluid that passes through the inlet pipe. Compared to higher.

  On the other hand, when the piping between the boiling circuit and the heating unit is reversely connected, heat storage is performed by controlling the heating unit, the boiling pump, and the flow rate adjusting means during the water level confirmation process of the hot water filling test operation. The working fluid flows as follows. That is, the heat storage fluid in the upper part of the tank flows to the return pipe for boiling → inlet pipe → heating section → outlet pipe → outgoing pipe for boiling → lower part of the tank, and return pipe for boiling → extraction pipe → heat load It flows in the order of heat exchanger for intake → intake pipe → tank.

  At this time, since the heat storage fluid at the upper part of the tank passes through both the intake pipe and the inlet pipe, the temperature between the temperature of the heat storage fluid passing through the intake pipe and the temperature of the heat storage fluid passing through the inlet pipe There is almost no difference.

  Therefore, when the difference between the detection value of the first temperature detection means and the detection value of the second temperature detection means during execution of the water level confirmation process is small, the piping between the boiling circuit and the heating unit is reversely connected. Can be determined.

  In particular, in the present invention, the reverse connection determination is performed during execution of the water level confirmation process during the hot water filling test operation, that is, in a period in which the heat storage fluid and the hot water supply water are not substantially heat exchanged in the heat load heat exchanger. According to this, even if the heat storage fluid passes through the heat load heat exchanger, the detection values of the first and second temperature detection means hardly change, so the piping between the boiling circuit and the heating unit is reversely connected. It can be appropriately determined whether or not. In addition, during the execution of the water level confirmation process in the hot water filling test operation, the supply of hot water to the heat load heat exchanger and the bathtub is stopped, so that the heat storage fluid and hot water in the heat load heat exchanger The heat exchange is substantially stopped.

  Here, when the water level check process is performed, if the heat storage fluid (high temperature fluid) in the upper part of the tank flows to the extraction pipe via the boiling return pipe in addition to the heat storage fluid flowing through the heating section, the connection is normal. There is a possibility that the temperature difference between the heat storage fluid passing through the intake pipe and the heat storage fluid passing through the inlet pipe in the state becomes small.

  Therefore, in the invention according to claim 3, in the hot water supply device according to claim 2, the apparatus further comprises third temperature detection means (111) for detecting the temperature of the heat storage fluid in the upper part of the tank, and the reverse connection determination means comprises: (3) The determination threshold value is reduced in accordance with an increase in the detection value of the temperature detection means. According to this, it can be determined more appropriately whether the piping between the boiling circuit and the heating unit is in a reverse connection state.

  In addition, the code | symbol in the parenthesis of each means described in this column and the claim shows an example of a correspondence relationship with the specific means described in the embodiment described later.

It is a block diagram which shows schematic structure of the hot water supply apparatus which concerns on 1st Embodiment. It is a block diagram which shows an example of the operation part which concerns on 1st Embodiment. It is a flowchart which shows the flow of the control processing at the time of the hot-water filling test run which the control part of 1st Embodiment performs. In the hot-water supply apparatus which concerns on 1st Embodiment, it is a block diagram which shows the flow of the heat storage fluid at the time of implementing a hot-water filling test operation in a normal connection state, and the hot-water supply water. In the hot-water supply apparatus which concerns on 1st Embodiment, it is a block diagram which shows the flow of the heat storage fluid and the hot water supply water at the time of implementing hot water filling trial operation in a reverse connection state. It is a flowchart which shows the flow of the reverse connection determination process which the control part of 1st Embodiment performs. In the hot water supply apparatus which concerns on 1st Embodiment, it is a block diagram which shows the flow of the heat storage fluid at the time of implementing reverse connection determination processing in a normal connection state. In the hot water supply apparatus which concerns on 1st Embodiment, it is a block diagram which shows the flow of the fluid for thermal storage at the time of implementing reverse connection determination processing in a reverse connection state. It is a block diagram for demonstrating alerting | reporting of the determination result (reverse connection state) of the reverse connection determination process in an operation part. It is a block diagram for demonstrating alerting | reporting of the determination result (normal connection state) of the reverse connection determination process in an operation part. It is a block diagram which shows schematic structure of the hot water supply apparatus which concerns on 2nd Embodiment. It is a flowchart which shows the flow of the reverse connection determination process which the control part of 2nd Embodiment performs.

  Embodiments of the present invention will be described below with reference to the drawings. Note that, in each of the following embodiments, parts that are the same as or equivalent to the matters described in the preceding embodiment are denoted by the same reference numerals, and the description thereof may be omitted. Moreover, in each embodiment, when only a part of the component is described, the component described in the preceding embodiment can be applied to the other part of the component.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. The hot water supply apparatus 10 according to the present embodiment is used for general households, and uses a heat storage fluid stored in the hot water storage tank 11 as a heat source, in addition to a hot water supply function to a kitchen, a washroom, a bathroom, etc. It has a function of chasing hot water to the bathtub 51 and hot-watered bathtub water. In the present embodiment, the same hot water supply water as the hot water supply side (heat load side) is used as the “heat storage fluid”.

  The hot water supply apparatus 10 includes a hot water storage tank unit 20, a heat pump unit 13, a control unit 100, and an operation unit 120 (a main remote controller 121 and a bathroom remote controller 122).

  The hot water storage tank unit 20 includes a hot water storage tank 11, a boiling circuit 12, a thermal load circuit 14, a water supply pipe 15, a hot water supply pipe 27, a bath pouring unit 70, and a bath water circulation circuit 80.

  The hot water storage tank 11 is a tank (container) that stores a heat storage fluid therein. The hot water storage tank 11 is made of a metal having excellent corrosion resistance, for example, stainless steel, and a heat insulating material is provided on the outer peripheral portion thereof. As a result, the hot water storage tank 11 can keep the heat storage fluid warm for a long time.

  The hot water storage tank 11 has a vertically long shape, and in order to detect the amount of hot water stored in the hot water storage tank 11 and the hot water storage temperature, seven first to seventh water temperature thermistors 111 to 117 arranged in the height direction are provided. . Each water temperature thermistor 111-117 is connected to the control part 100 mentioned later, and the temperature information of the heat storage fluid with which the hot water storage tank 11 was filled in each water level is output to the control part 100 mentioned later. In the present embodiment, the first water temperature thermistor 111 that detects the temperature of the heat storage fluid in the upper part of the hot water storage tank 11 constitutes “third temperature detection means”. In addition, the control part 100 mentioned later is based on the temperature information output from each water temperature thermistor 111-117, and the boundary position of the hot water in the hot water storage tank 11 and the water before boiling in the hot water storage tank 11 below, The amount of hot water stored in the hot water storage tank 11 can be detected.

  The hot water storage tank 11 is provided with an introduction port 11a on the bottom surface thereof. A city water inflow pipe 21 for supplying city water into the hot water storage tank 11 is connected to the introduction port 11a. The city water pipe 22 connected to the city water inflow pipe 21 is provided with a pressure reducing valve 23 that adjusts the water pressure of the introduced tap water to a predetermined pressure and prevents the back flow of hot water in the case of water interruption. Yes. The city water pipe 22 is connected to a bath mixing valve 24 and a hot water supply mixing valve 25 described later via a water supply pipe 15.

  Subsequently, the heat pump unit 13 is a “heating unit” that heats the heat storage fluid introduced from the inlet pipe 36 and derives it from the outlet pipe 37. Although not shown, the heat pump unit 13 of the present embodiment is connected so that at least a compressor, a water refrigerant heat exchanger as a radiator, a variable decompressor, an evaporator, and a gas-liquid separator constitute a closed circuit. Have a heat pump cycle. The heat pump cycle of this embodiment employs carbon dioxide as a refrigerant, and constitutes a vapor compression supercritical refrigeration cycle in which the high-pressure side refrigerant pressure exceeds the critical pressure of the refrigerant.

  The heat pump unit 13 is provided with an inflow side thermistor 13 a that detects the temperature of the heat storage fluid that flows into the heat pump unit 13 through the inlet pipe 36. The inflow side thermistor 13a detects temperature information used to adjust the heating capacity of the heat storage fluid by the heat pump unit 13, and is connected to the control unit 100 described later. The control unit 100 described later adjusts the heating capability of the heat pump unit 13 by controlling the operation of the variable pressure reducer and the compressor using the detection information (temperature information) of the inflow side thermistor 13a. In the present embodiment, the inflow side thermistor 13a constitutes “first temperature detecting means”.

  The heat pump unit 13 stores heat by exchanging heat between a high-temperature and high-pressure refrigerant flowing through the refrigerant flow path of the water refrigerant heat exchanger and a heat storage fluid (water) flowing through the water flow path of the water refrigerant heat exchanger. It is possible to boil up the working fluid.

  Further, as in the present embodiment, when the heat pump cycle is configured by a supercritical refrigeration cycle, the heat storage fluid has a higher temperature (for example, about 85 ° C. to 90 ° C.) than a general heat pump cycle (subcritical refrigeration cycle). Can be boiled up. The heat pump cycle mainly boiles hot water in the hot water storage tank 11 when the hot water storage capacity of the hot water storage tank 11 is insufficient or by using midnight power in the midnight time zone where the price setting is inexpensive. The heat pump unit 13 may employ, for example, an ejector refrigeration cycle using an electric ejector as a heat pump cycle, or a subcritical refrigeration cycle using an HFC refrigerant, an HFO refrigerant, or the like as a refrigerant. Good.

  Subsequently, the boiling circuit 12 is a circuit for taking out the heat storage fluid from the lower part of the hot water storage tank 11 and heating it with the heat pump unit 13 and returning the heat storage fluid to the upper part of the hot water storage tank 11 again. The boiling circuit 12 includes a boiling forward pipe 31 that connects the lower part of the hot water storage tank 11 and the inlet pipe 36, and a boiling return pipe 32 that connects the outlet pipe 37 and the upper part of the hot water storage tank 11.

  Further, the boiling circuit 12 supplies the heat storage fluid at the lower part of the hot water storage tank 11 to the boiling forward pipe 31 → the inlet pipe 36 → the heat pump unit 13 → the outlet pipe 37 → the boiling return pipe 32 → the upper part of the hot water storage tank 11. A boiling circulation pump 33 for flowing in this order. The boiling circulation pump 33 according to the present embodiment is disposed in the inlet pipe 36 and is configured by a pump that flows in one direction from the inlet pipe 36 → the heat pump unit 13 → the outlet pipe 37. In the present embodiment, the boiling circulation pump 33 constitutes a “boiling pump”.

  A bypass pipe 35 communicating with the boiling forward pipe 31 is connected to the boiling return pipe 32 of the present embodiment. A flow path switching valve 34 is provided at the junction of the boiling return pipe 32 and the bypass pipe 35.

  The flow path switching valve 34 is a three-way valve that switches the flow path of the heat storage fluid flowing through the boiling return pipe 32 to a flow path toward the upper part of the hot water storage tank 11 and a flow path toward the bypass pipe 35. In addition, the flow path switching valve 34 of the present embodiment is configured to be able to adjust the flow rate ratio between the flow rate of the heat storage fluid flowing toward the upper part of the hot water storage tank 11 and the flow rate of the heat storage fluid flowing in the bypass pipe 35.

  Subsequently, the heat load circuit 14 is a circuit for performing heat exchange between the heat storage fluid in the hot water storage tank 11 and the bathtub water (hot water supply water) stored in the bathtub 51, and chasing the bathtub water in the bathtub 51. . The thermal load circuit 14 of the present embodiment includes an extraction pipe 41, a bath heat exchanger 42, an intake pipe 43, a bath primary pump 44, a bath primary thermistor 45, and a bath primary check valve 46.

  The extraction pipe 41 is a pipe for taking out the heat storage fluid from the upper part of the hot water storage tank 11 through the boiling return pipe 32, and is connected to the upstream side of the flow path switching valve 34 in the boiling return pipe 32. The pipe 410 extending from the flow path switching valve 34 to the upper part of the hot water storage tank 11 in the return pipe 32 for boiling also functions as a pipe (auxiliary extraction pipe) for taking out the heat storage fluid from the upper part of the hot water storage tank 11 to the extraction pipe 41. To do.

  The extraction pipe 41 of the present embodiment is provided with a bath primary check valve 46. The bath primary check valve 46 is provided to prevent the heat storage fluid from flowing backward from the intake pipe 43 side to the extraction pipe 41 side via the bath heat exchanger 42. The bath primary check valve 46 also functions as a flow resistance that prevents the heat storage fluid in the return return pipe 32 from flowing into the extraction pipe 41 when the bath primary pump 44 is stopped.

  The bath heat exchanger 42 is a “heat load heat exchanger” that exchanges heat between the heat storage fluid that has passed through the extraction pipe 41 and bath water (hot water supply water) that is used on the bath side (heat load side). Specifically, the bath heat exchanger 42 includes a first circulation part 42a through which heat storage fluid circulates and a second circulation part 42b through which bathtub water circulates, and fluids flowing through the circulation parts 42a and 42b are connected to each other. It is configured to exchange heat.

  The intake pipe 43 is a pipe that returns the heat storage fluid that has passed through the bath heat exchanger 42 to the hot water storage tank 11. The intake pipe 43 is provided with a bath primary pump 44 and a bath primary thermistor 45 that detects the temperature of the heat storage fluid passing through the intake pipe 43.

  The bath primary pump 44 is a heat load circulation pump for flowing the heat storage fluid of the boiling return pipe 32 in the order of the extraction pipe 41 → the bath heat exchanger 42 → the intake pipe 43 → the hot water storage tank 11.

  The bath primary pump 44 has a heat storage fluid flowing through the heat pump unit 13 and an upper portion of the hot water storage tank 11 when the return piping 32 for boiling and the upper portion of the hot water storage tank 11 communicate with each other through the flow path switching valve 34. Each of the heat storage fluids is caused to flow to the extraction pipe 41 via the boiling return pipe 32.

  The bath primary pump 44 returns only the heat storage fluid flowing through the heat pump unit 13 when the return switching pipe 32 is not in communication with the upper part of the hot water storage tank 11 by the flow path switching valve 34. It flows to the extraction pipe 41 through the pipe 32.

  When the operation of the bath primary pump 44 is stopped, the bath primary check valve 46 becomes a flow resistance that prevents the heat storage fluid in the return piping 32 for boiling from flowing into the extraction piping 41 side. The heat storage fluid in the return pipe 32 hardly flows into the extraction pipe 41.

  As described above, in the present embodiment, the flow rate of the heat storage fluid that flows from the boiling return pipe 32 to the extraction pipe 41 is adjusted by the operation of the bath primary pump 44 and the setting of the flow path switching valve 34. Therefore, in this embodiment, the bath primary pump 44 and the flow path switching valve 34 constitute “flow rate adjusting means” that adjusts the flow rate of the heat storage fluid that flows from the return piping 32 for boiling to the extraction piping 41.

  The bath primary thermistor 45 detects temperature information used for adjusting the heat exchange capability of the bath heat exchanger 42 and is connected to the control unit 100 described later. The control unit 100 described later adjusts the heat exchange capability of the bath heat exchanger 42 by controlling the number of revolutions of the bath primary pump 44 using temperature information detected by the bath primary thermistor 45. In the present embodiment, the bath primary thermistor 45 constitutes “second temperature detecting means”.

  Subsequently, the hot water supply pipe 27 is connected to the upper part of the hot water storage tank 11, and the heat storage fluid (high temperature water) at the upper part of the hot water storage tank 11 is used as the shower 54 in the bathroom provided on the most downstream side, the faucet in the kitchen and the washroom. It is a pipe for leading to the hot water usage side terminal.

  A discharge pipe 53 provided with a relief valve 52 is connected to the hot water supply pipe 27 in the middle of the route to the hot water use side terminal. This relief valve 52 discharges the heat storage fluid (high temperature water) in the upper part of the hot water storage tank 11 to the outside when the pressure in the hot water storage tank 11 rises above a predetermined pressure.

  In addition, an intermediate hot water pipe 29 is connected downstream of the discharge pipe 53 in the hot water supply pipe 27. The intermediate hot water pipe 29 is a pipe for deriving a heat storage fluid (intermediate hot water) that is an intermediate temperature in the hot water storage tank 11 from an intermediate hot water portion that constitutes a middle stage in the hot water storage tank 11.

  An intermediate temperature water mixing valve 30 is provided at the junction of the hot water supply pipe 27 and the intermediate temperature water pipe 29. This intermediate temperature water mixing valve 30 is configured to be able to adjust the mixing ratio of the high temperature water taken out from the hot water supply pipe 27 and the intermediate temperature water taken out from the intermediate temperature water pipe 29, and by adjusting the mixing ratio of the high temperature water and the intermediate temperature water, It is a temperature adjustment valve that adjusts the temperature of the heat storage fluid flowing through the hot water supply pipe 27. The intermediate temperature water pipe 29 is provided with intermediate temperature water for preventing the heat storage fluid (high temperature water) in the upper part of the hot water storage tank 11 from flowing back to the intermediate temperature water section of the hot water storage tank 11 via the intermediate temperature water mixing valve 30. A check valve 17 is provided.

  On the downstream side of the hot / cold water mixing valve 30 in the hot water supply pipe 27, a bath pipe 28 that guides the heat storage fluid flowing in the hot water supply pipe 27 to the bathtub 51 through a bath outlet pipe 81 described later is connected. A water supply pipe 15 is connected to the bath pipe 28, and a bath mixing valve 24 is provided at a junction with the water supply pipe 15.

  The bath mixing valve 24 is configured to be capable of adjusting a flow rate ratio between the flow rate of hot water supplied by the intermediate temperature water mixing valve 30 and the flow rate of water introduced from the city water pipe 22. Thus, the temperature adjustment valve adjusts the temperature of the hot water supplied from the end of the bath pipe 28. The flow rate ratio in the bath mixing valve 24 is adjusted according to the detection value of the bath thermistor 73 provided on the outlet side of the bath mixing valve 24.

  A bath pouring unit 70 for pouring hot water into the bathtub 51 is provided on the downstream side of the bath mixing valve 24 in the bath piping 28. The bath pouring unit 70 includes a bath solenoid valve 71, a backflow prevention valve 72, a bath thermistor 73 that detects the temperature of hot water flowing through the bath piping 28, and a bath flow counter that detects the flow rate of hot water flowing through the bath piping 28. 74 and two check valves 75 for baths.

  The bath solenoid valve 71 is opened when the bathtub 51 is filled with hot water, hot water or additional hot water. The bath solenoid valve 71 is controlled by the control unit 100 so that the mixed hot water of a predetermined flow rate is discharged based on the flow rate information detected by the bath flow rate counter 74. When the flow rate of water in the bath pipe 28 is detected by the bath flow rate counter 74, the bath electromagnetic valve 71 is opened and hot water supply water is being discharged.

  The two check valves 75 for bath are provided to prevent backflow of bath water in the bath water circulation circuit 80 described later to the bath mixing valve 24 side. Between the two check valves 75 for bath, a check valve 72 having an upstream end connected to the discharge path and a pressure guiding pipe connected downstream of the bath mixing valve 24 is provided. The backflow prevention valve 72 operates the backflow prevention valve 72 according to the pressure difference between the two connection points when there is bathtub water to enter the hot water supply pipe 27 side, and the bathtub water is supplied to the outside of the bath pouring unit 70. Can be discharged.

  A water supply pipe 15 is connected to a downstream side of the hot water supply pipe 27 with respect to the connection with the bath pipe 28, and a hot water supply mixing valve 25 is provided at a junction with the water supply pipe 15. The hot water supply mixing valve 25 is configured to be able to adjust the flow rate ratio between the flow rate of hot water supplied by the hot water mixing valve 30 and the flow rate of water introduced from the city water pipe 22. Thus, the temperature adjustment valve adjusts the temperature of the hot water to be discharged at the end of the hot water supply pipe 27. The flow rate ratio in the hot water supply mixing valve 25 is adjusted according to the detection value of the hot water supply thermistor 61 provided on the outlet side of the hot water supply mixing valve 25.

  On the downstream side of the hot water supply mixing valve 25 in the hot water supply pipe 27, a hot water supply thermistor 61 that detects the temperature of hot water flowing through the hot water supply pipe 27, a hot water supply flow rate counter 62 that detects the flow rate of hot water flowing through the hot water supply pipe 27, and hot water supply A check valve 63 is provided.

  The hot water check valve 63 is provided to prevent the backflow of the heat storage fluid from the shower 54 at the end of the hot water supply pipe 27 to the hot water supply mixing valve 25 side. When the flow of water in the hot water supply pipe 27 is detected by the hot water supply flow rate counter 62, the hot water supply water is being discharged from the shower 54 or the like at the end of the hot water supply pipe 27.

  Next, the bath water circulation circuit 80 will be described. The bath water circulation circuit 80 is a circuit for circulating the bathtub water stored in the bathtub 51 to the bath heat exchanger 42 to track the bathtub water in the bathtub 51. In the present embodiment, the bath pouring unit 70 and the bath water circulation circuit 80 constitute a “bathtub circuit”.

  The bath water circulation circuit 80 of the present embodiment has a bath outlet pipe 81 that guides the bath water in the bathtub 51 to the upstream end of the bath heat exchanger 42, and the bath water heat-exchanged in the bath heat exchanger 42 in the bathtub 51. A bath return pipe 82 is provided. In the present embodiment, the bath return pipe 82 constitutes a “tub introduction pipe”.

  In the bath-out piping 81, a water level sensor 87, a bath circulation sensor 83 that detects whether or not the bath water is flowing to the bath heat exchanger 42 side, and a bath that detects the bath water temperature of the bath 51 in order from the bath 51 side. A reheating thermistor 85 and a bath circulation pump 84 are provided. The bath return pipe 82 is provided with a bath heat exchange thermistor 86 that detects the outlet temperature of the bath heat exchanger 42.

  The bath circulation pump 84 is a pump for flowing the bathtub water in the bathtub 51 in the order of the bath outlet pipe 81 → the bath heat exchanger 42 → the bath return pipe 82 → the bathtub 51 when chasing the bathtub water in the bathtub 51. .

  The water level sensor 87 is water level detection means for detecting the water level in the bathtub 51. Since the water pressure (static pressure) in the bath outlet pipe 81 increases as the water level in the bathtub 51 rises, in this embodiment, a pressure sensor that detects the water pressure in the bath outlet pipe 81 is adopted as the water level sensor 87. doing.

  Here, the downstream end of the bath pipe 28 is connected between the bath circulation pump 84 and the bath heat exchanger 42. Accordingly, when the bath solenoid valve 71 is opened during the hot water filling operation of the bathtub 51, hot water supply water adjusted to a desired temperature by the bath mixing valve 24 is supplied from the bath outlet pipe 81 to the bathtub 51. At the same time, the water is supplied from the bath outlet pipe 81 to the bathtub 51 through the bath heat exchanger 42 and the bath return pipe 82. In the present embodiment, the bath solenoid valve 71 and the bath circulation pump 84 supply “tub supply means” for supplying hot water passing through the bath heat exchanger 42 to the bathtub 51 via the bath return pipe 82. Configure.

  Then, the control part 100 which is an electronic control part of the hot water supply apparatus of this embodiment is demonstrated. The control unit 100 is configured mainly with a microcomputer, and preset control programs and updatable control programs are stored in various memories (ROM, RAM, EEPROM, etc.) built in as storage means.

  On the input side of the control unit 100, there is a sensor group for hot water supply such as each thermistor 111 to 117, 13a, 45, 61, 73, 85, 86, each flow counter 62, 74, bath circulation sensor 83, water level sensor 87, and the like. It is connected. In addition, a main remote controller 121, a bathroom remote controller 122, and the like, which will be described later, are connected to the control unit 100 so as to be capable of bidirectional communication.

  Various control devices such as the heat pump unit 13, the mixing valves 24, 25, 30, the bath electromagnetic valve 71, the flow path switching valve 34, and the circulation pumps 33, 44, 84 are connected to the output side of the control unit 100. ing. The control unit 100 controls various control devices based on detection information of the hot water supply sensor group, operation signals from the remote controllers 121 and 122, and the like.

  Next, the main remote controller 121 and the bathroom remote controller 122 will be described. Each of the remote controllers 121 and 122 is an operation unit 120 for the user to request the control unit 100 to perform various operations such as a boiling operation, a memorial operation, and a hot water operation.

  The main remote controller 121 is an operation unit 120 that is installed in a place (kitchen or the like) other than the bathroom to operate the entire hot water supply device. On the other hand, the bathroom remote controller 122 is an operation unit 120 that is installed in a bathroom and mainly operates a bath function.

  As shown in FIG. 2, each remote controller 121, 122 displays various information such as an operation switch 120a for requesting the control unit 100 to perform various operations, an operation state, various temperatures, an operation guide, and an error. A display unit 120b for performing various operations and a speaker 120c for outputting various types of information are provided. In the present embodiment, the display unit 120b and the speaker 120c constitute “notification means” for notifying the worker of various types of information. The remote controllers 121 and 122 illustrated in FIG. 2 are examples, and the arrangement form of the operation switch 120a, the display unit 120b, and the speaker 120c is not limited to that illustrated in FIG. In addition, in each of the remote controllers 121 and 122, the arrangement form and the number of the operation switches 120a, the display unit 120b, and the speakers 120c may be different.

  Next, the operation of the hot water supply apparatus 10 will be described. In the present embodiment, a typical operation after the completion of installation of the hot water supply device 10 (after the trial operation) will be described, and then an operation of the hot water filling test operation performed when the hot water supply device 10 is installed will be described. In the operation after the installation of the hot water supply device 10 is completed, it is assumed that the connection state of the piping between the boiling circuit 12 and the heat pump unit 13 is a normal connection state.

  First, the boiling operation of the heat storage fluid in the hot water storage tank 11 after the installation of the hot water supply device 10 is completed will be described. This boiling operation is performed by the control unit 100 in a specific boiling time zone (for example, a night time zone of a lighting system according to time zone).

  During the boiling operation, the control unit 100 controls the flow path switching valve 34 so that the flow path of the heat storage fluid flowing through the boiling return pipe 32 becomes a flow path toward the upper part of the hot water storage tank 11. Thereafter, the control unit 100 operates the heat pump unit 13 and the boiling circulation pump 33 so that the preset amount of hot water or the hot water for the entire amount of the hot water storage tank 11 is stored on the upper side of the hot water storage tank 11.

  Thereby, the heat storage fluid in the lower part of the hot water storage tank 11 flows in the order of the boiling forward pipe 31 → the inlet pipe 36 → the heat pump unit 13 → the outlet pipe 37 → the boiling return pipe 32 → the upper part of the hot water storage tank 11. Then, the heat storage fluid in the lower part of the hot water storage tank 11 is boiled up to a predetermined boiling temperature when passing through the heat pump unit 13, and is stored in the upper part of the hot water storage tank 11.

  Next, a hot water supply operation using the heat storage fluid in the hot water storage tank 11 after the installation of the hot water supply apparatus 10 is completed will be described. This hot water supply operation is executed when the control unit 100 receives a request signal for requesting execution of the hot water supply operation from each of the remote controllers 121 and 122, for example.

  During the hot water supply operation, the control unit 100 opens a hot water tap or the like disposed at the end of the hot water supply pipe 27. The heat storage fluid in the hot water storage tank 11 is pushed out to the hot water supply pipe 27 side by the water supply pressure at this time, and the heat storage fluid from the hot water storage tank 11 and the water from the city water inflow pipe 21 are connected to each mixing valve 25 through each pipe. , 30 and adjusted to a desired temperature (hot water supply set temperature). Thereafter, hot water for which the temperature is adjusted by the mixing valves 25 and 30 is supplied to the shower 54 and the like at the end of the hot water supply pipe 27.

  Next, the hot water filling operation of the bathtub 51 after the installation of the hot water supply apparatus 10 is completed will be described. This hot water filling operation is executed when the control unit 100 receives a request signal for requesting execution of the hot water filling operation from each of the remote controllers 121 and 122, for example.

  During the hot water operation, the control unit 100 opens the bath solenoid valve 71. The heat storage fluid in the hot water storage tank 11 is pushed out to the hot water supply pipe 27 side by the water supply pressure at this time, and the heat storage fluid from the hot water storage tank 11 and the water from the city water inflow pipe 21 are mixed by the bath mixing valve 24 and desired. Is adjusted to the temperature of the hot water (set temperature). The hot water supply water whose temperature is adjusted by the bath mixing valve 24 is supplied to the bathtub 51 via the bath water circulation circuit 80.

  After that, when the hot water filling is completed by supplying the hot water supply of the target hot water amount to the bathtub 51, the control unit 100 closes the bath electromagnetic valve 71. And the control part 100 operates the bath circulation pump 84 every predetermined time, circulates the bath water of the bathtub 51 in the bath water circulation circuit 80, detects the temperature of bath water with the bath reheating thermistor 85, and heat-retains. It is necessary to monitor whether there is a need for reworking.

  The control unit 100 automatically performs a chasing operation when the temperature of the bath water is lower than the set temperature. Note that the control unit 100 also performs the chasing operation when receiving a request signal for requesting the chasing operation from each of the remote controllers 121 and 122.

  At the time of the memorial operation, the control unit 100 first operates the bath circulation pump 84 to take the bath water into the bath water circulation circuit 80 and circulate it to the bath heat exchanger 42. In this state, the control unit 100 controls the flow path switching valve 34 so that the boiling return pipe 32 and the upper part of the hot water storage tank 11 communicate with each other, and operates the bath primary pump 44.

  Thereby, the heat storage fluid directly supplied from the heat pump unit 13 and the heat storage fluid in the hot water storage tank 11 flow to the bath heat exchanger 42 through the extraction pipe 41. At this time, in the bath heat exchanger 42, the heat storage fluid and the bathtub water from the bathtub 51 exchange heat, and the temperature of the bathtub water rises. Note that the heat storage fluid that has passed through the bath heat exchanger 42 and has a temperature drop returns to the hot water storage tank 11 through the intake pipe 43.

  Further, the control unit 100 detects the temperature of the bath water that has passed through the bath heat exchanger 42 with the bath heat exchanger thermistor 86 and the temperature of the heat storage fluid that has passed through the bath heat exchanger 42 with the bath primary thermistor 45. To detect. Then, based on the detected temperatures detected by the thermistors 45 and 86, the bath primary pump 44 is set so that the temperature of the bath water that has passed through the bath heat exchanger 42 becomes a target temperature determined according to the set temperature. The number of rotations is controlled, and the temperature of the bathtub water in the bathtub 51 is raised to the set temperature.

  Next, the operation of the hot water filling test operation that is performed when the hot water supply apparatus 10 is installed or when the components are replaced will be described. In the hot water filling test operation of the hot water supply apparatus 10 of the present embodiment, when the heat storage fluid in the hot water storage tank 11 is boiled by the heat pump unit 13, the hot water filling is performed on the bathtub 51 and the amount of hot water supply to the bathtub 51 is supplied. And the water level change of the hot water supply water in the bathtub 51 is confirmed. Since this hot water filling trial operation actually fills the bathtub 51, it takes a long time (for example, about 30 minutes) to be completed after the operation is started.

  Therefore, in the present embodiment, in order to shorten the time required for the test run, the reverse connection determination process, which is a process that requires a long time, is performed in the same manner as the test for the hot water filling test.

  Here, the reverse connection determination process is a process of determining whether or not the piping between the boiling circuit 12 and the heat pump unit 13 is in a reverse connection state. The reverse connection state is a state where the outlet pipe 37 is connected to the boiling forward pipe 31 and the inlet pipe 36 is connected to the boiling return pipe 32. On the other hand, the normal connection state is a state where the inlet pipe 36 is connected to the boiling forward pipe 31 and the outlet pipe 37 is connected to the boiling return pipe 32 as shown in FIG. .

  Each of the hot water filling test operation and the reverse connection determination process is executed by a control process by the control unit 100. In the present embodiment, the configuration (hardware, software) for executing the hot water filling test operation in the control unit 100 constitutes the operation control means 100a, and the configuration (hardware, software) for executing the reverse connection determination processing in the control unit 100 is reverse connection. The determination unit 100b is configured.

  First, the control process of the hot water filling test run performed by the control unit 100 of the present embodiment will be described with reference to the flowchart shown in FIG. 3 and the configuration diagram of the hot water supply apparatus 10 shown in FIGS. 4 and 5. In the control routine shown in FIG. 3, the hot water supply device 10 is turned on after the piping of the hot water supply device 10 and the electrical system are connected and the hot water supply tank 11 is supplied with water (breaker is turned on). This is executed by the control unit 100.

  As shown in FIG. 3, it is determined whether or not a request signal requesting execution of a hot water filling test operation has been received from one of the main remote controller 121 and the bathroom remote controller 122 (S10). A request signal for requesting execution of the hot water filling test operation is transmitted to the control unit 100 by an operation of the main remote controller 121 or the bathroom remote controller 122 by an operator (construction contractor or service person).

  If it is determined in step S10 that the request signal for requesting execution of the hot water filling test is received, a test start process is executed (S11). In this test operation start process, the temperature information of the thermistors 111 to 117, 13a, 45, 61, 73, 85, 86 at the start of the test operation is stored in the memory, and the target boiling temperature, target hot water amount, etc. in the test operation The target value is determined. The target values such as the target boiling temperature and the target hot water filling amount are determined as initial values stored in the memory in advance or set values set by the operator by operating the main remote controller 121 or the bathroom remote controller 122.

  Here, when a predetermined amount of water circulates in the boiling circuit 12 as a heat storage fluid when water is supplied to the hot water storage tank 11, the boiling circuit 12 has a long piping. Air may stay. The retention of air in the boiling circuit 12 is not preferable because it causes an increase in the load on the circulating pump 33 for boiling during the boiling operation and the heating capability of the heat pump unit 13 becomes unstable.

  For this reason, after the trial run start process is completed, an air bleeding process is performed to remove air staying in the boiling circuit 12 (S12). In this air venting process, for example, the flow path of the heat storage fluid flowing through the boiling return pipe 32 by the flow path switching valve 34 is set as a flow path toward the upper part of the hot water storage tank 11 or a flow path toward the bypass pipe 35. In this state, the boiling circulation pump 33 and the bath primary pump 44 are operated at a low speed. Thereby, the air staying in the boiling circuit 12 is pushed out into the hot water storage tank 11 by the water forcedly fed into the boiling circuit 12 and is discharged to the outside through the relief valve 52.

  When the air bleeding process is completed, the boiling operation and the hot water filling operation are started (S13). Specifically, the heat pump unit 13 and the boiling circulation pump 33 are operated, and the flow path of the heat storage fluid flowing through the boiling return pipe 32 is a flow path toward the upper part of the hot water storage tank 11. The path switching valve 34 is controlled and the bath solenoid valve 71 is opened.

  At this time, when the piping between the boiling circuit 12 and the heat pump unit 13 is in a normal connection state, the heat storage fluid in the hot water storage tank 11 flows as follows. That is, as shown by the white arrow in FIG. 4, the heat storage fluid in the hot water storage tank 11 is the lower part of the hot water storage tank 11 → the forward piping 31 for boiling → the inlet piping 36 → the heat pump unit 13 → the outlet piping 37 → for boiling. It flows in the order of the return pipe 32 → the upper part of the hot water storage tank 11. In this case, the heat storage fluid in the lower part of the hot water storage tank 11 is heated up to a predetermined boiling temperature when passing through the heat pump unit 13, and then stored in the upper part of the hot water storage tank 11.

  Moreover, when the piping between the boiling circuit 12 and the heat pump unit 13 is in a normal connection state, the heat storage fluid in the upper part of the hot water storage tank 11 and the water from the city water inflow piping 21 flow as follows. That is, the heat storage fluid in the upper part of the hot water storage tank 11 and the water from the city water inflow pipe 21 are mixed by the bath mixing valve 24 and then the bath of the bath water circulation circuit 80 as shown by the thick black arrows in FIG. It flows to the bathtub 51 through both the outgoing pipe 81 and the bath return pipe 82. In addition, by flowing hot water supply water through both the bath-out piping 81 and the bath return piping 82, the air staying in the bath water circulation circuit 80 can be discharged from the bathtub 51 side to the outside.

  On the other hand, when the piping between the boiling circuit 12 and the heat pump unit 13 is in a reverse connection state, the heat storage fluid in the hot water storage tank 11 flows as follows. That is, the heat storage fluid in the hot water storage tank 11 is, as shown by the white arrow in FIG. 5, the upper part of the hot water storage tank 11 → the return return pipe 32 → the inlet pipe 36 → the heat pump unit 13 → the outlet pipe 37 → It flows in the order of the forward piping 31 → the lower part of the hot water storage tank 11.

  In this case, the heat storage fluid in the upper part of the hot water storage tank 11 is heated to a predetermined boiling temperature when passing through the heat pump unit 13 and then stored in the lower part of the hot water storage tank 11. That is, the water in the hot water storage tank 11 is only warmed by the heat storage fluid returned to the lower part of the hot water storage tank 11, and hot water having a desired temperature cannot be taken out from the upper part of the hot water storage tank 11.

  When the piping between the boiling circuit 12 and the heat pump unit 13 is in a reverse connection state, the heat storage fluid in the upper part of the hot water storage tank 11 and the water from the city water inflow piping 21 are indicated by thick black arrows in FIG. Thus, the flow is the same as in the normal connection state.

  Subsequently, after starting the boiling operation and the hot water filling operation, it is determined whether or not a preset reference amount of water has been supplied to the bathtub 51 (S14). In this determination process, for example, the determination is made based on the total flow rate after the hot water filling operation of the detected flow rate of the bath flow rate counter 74 is started.

  In the determination process of step S14, when it is determined that the reference amount of water has been supplied to the bathtub 51, the reference water level confirmation for checking the water level change of the bathtub 51 with respect to the amount of water supplied to the bathtub 51 (reference amount). Processing is executed (S15).

  This reference water level confirmation process is performed in order to confirm the relationship between the amount of water supplied to the bathtub 51 (reference amount) and the water level change of the bathtub 51 and to grasp the horizontal cross-sectional area of the bathtub 51. In the reference water level confirmation process, first, the bath electromagnetic valve 71 is closed, and the supply of hot water to the bathtub 51 is stopped. After the hot water supply water flow in the bath water circulation circuit 80 stops, the water level sensor 87 detects the water level of the bathtub 51. And after calculating the horizontal cross-sectional area of the bathtub 51 from the detected value of the water level sensor 87 and the supply amount of the water to the bathtub 51, the solenoid valve 71 for baths is opened, and the hot water supply water to the bathtub 51 is supplied. To resume. The detected value of the water level sensor 87, the amount of water supplied to the bathtub 51, and the horizontal sectional area of the bathtub 51 are stored in a memory (for example, EEPROM) of the control unit 100 so that it can be referred to even after the trial run. The

  After completion of the reference water level confirmation process, it is determined whether or not the target hot water filling amount (> reference amount) determined in the trial operation start process (S11) has been supplied to the bathtub 51 (S16). In this determination process, for example, the determination is made based on the total flow rate after the hot water filling operation of the detected flow rate of the bath flow rate counter 74 is started.

  If it is determined in step S16 that the target hot water amount of water has been supplied to the bathtub 51, a change in the water level of the bathtub 51 relative to the amount of water supplied to the bathtub 51 (target hot water amount) is confirmed. A set water level confirmation process is executed (S17).

  This set water level confirmation process confirms the relationship between the amount of water supplied to the bathtub 51 (target hot water amount) and the change in the water level of the bathtub 51, as well as the reference level confirmation process, and the horizontal disconnection of the bathtub 51. This is done to grasp the area.

  In the set water level confirmation process, the electromagnetic valve 71 for bath is closed and the supply of hot water to the bathtub 51 is stopped. And after the flow of the hot water supply water in the bath water circulation circuit 80 stops, the water level of the bathtub 51 is detected by the water level sensor 87. Then, the horizontal sectional area of the bathtub 51 is calculated from the detection value of the water level sensor 87 and the amount of water supplied to the bathtub 51. The detected value of the water level sensor 87, the amount of water supplied to the bathtub 51, and the horizontal sectional area of the bathtub 51 are stored in a memory (for example, EEPROM) of the control unit 100 so that it can be referred to even after the trial run. The

  Subsequently, it is determined whether or not the boiling of the heat storage fluid in the hot water storage tank 11 is completed with the bath electromagnetic valve 71 closed (S18). In this determination process, the temperature of the heat storage fluid in the hot water storage tank 11 (for example, the detected values of the first and second water temperature thermistors 111 and 112) is equal to or higher than the target boiling temperature determined in the trial operation start process (S11). It is determined whether the boiling operation is completed when the temperature is equal to or higher than the target boiling temperature.

  When it is determined in the determination process of step S18 that the boiling of the heat storage fluid has been completed, a test run end process is executed (S19), and the hot water filling test run is ended. In this trial operation end process, the heat pump unit 13 and the boiling circulation pump 33 are stopped, and the operator is notified by the display unit 120b and the speaker 120c of the operation unit 120 that the trial operation has been completed.

  Next, reverse connection determination processing executed by the control unit 100 of the present embodiment will be described with reference to the flowchart shown in FIG. 6 and the configuration diagrams shown in FIGS. Note that the control routine shown in FIG. 6 is executed by the control unit 100 in parallel with the aforementioned hot water filling test operation.

As shown in FIG. 6, first, it is determined whether or not a reverse connection determination start condition is satisfied (S30). In step S30, it is determined that the reverse connection determination start condition is satisfied if at least all of the following conditions 1 to 3 are satisfied.
・ Condition 1: “Set water level confirmation process is being executed in the hot water test run”
・ Condition 2: “The boiling operation is executed in the hot water filling test”
Condition 3: “The flow path of the heat storage fluid is set to the flow path toward the upper part of the hot water storage tank 11 by the flow path switching valve 34”
If it is determined in step S30 that the reverse connection determination start condition is satisfied, the operation of the bath primary pump 44 of the thermal load circuit 14 is started (S31).

  Thereby, when the piping between the boiling circuit 12 and the heat pump unit 13 is in a normal connection state, the heat storage fluid in the hot water storage tank 11 flows as follows. That is, the heat storage fluid in the lower part of the hot water storage tank 11 is, as shown by the white arrow in FIG. 7, the boiling forward pipe 31 → the inlet pipe 36 → the heat pump unit 13 → the outlet pipe 37 → the boiling return pipe 32 → It flows to the extraction pipe 41 → the bath heat exchanger 42 → the intake pipe 43 → the hot water storage tank 11. At this time, the heat storage fluid in the upper part of the hot water storage tank 11 flows to the return pipe 32 for boiling up → the extraction pipe 41 → the bath heat exchanger 42 → the intake pipe 43 → the hot water storage tank 11. During the execution of the set water level confirmation process, the bath solenoid valve 71 is closed and the hot water supply water supply to the bath heat exchanger 42 is stopped. The heat exchange between the hot water supply water and the hot water supply water is substantially stopped.

  Thus, when the piping between the boiling circuit 12 and the heat pump unit 13 is in a normal connection state, the heat storage fluid (low temperature water) below the hot water storage tank 11 flows into the inlet piping 36 and flows into the intake piping 43. The heat storage fluid (high temperature water) heated by the heat pump unit 13 flows. At this time, the detected temperature of the bath primary thermistor 45 provided in the intake pipe 43 is higher than the detected temperature of the inflow side thermistor 13 a provided in the inlet pipe 36.

  On the other hand, when the piping between the boiling circuit 12 and the heat pump unit 13 is reversely connected, the heat storage fluid in the hot water storage tank 11 flows as follows. That is, the heat storage fluid in the upper part of the hot water storage tank 11 flows through the boiling return pipe 32 → the inlet pipe 36 → the heat pump unit 13 → the outlet pipe 37 → the lower part of the hot water storage tank 11 as shown by the white arrow in FIG. . Further, the heat storage fluid in the upper part of the hot water storage tank 11 flows from the return pipe 32 for boiling up to the extraction pipe 41, the bath heat exchanger 42, the intake pipe 43, and the hot water storage tank 11. During the execution of the set water level confirmation process, the bath solenoid valve 71 is closed and the hot water supply water supply to the bath heat exchanger 42 is stopped. The heat exchange between the hot water supply water and the hot water supply water is substantially stopped.

  Thus, when the piping between the boiling circuit 12 and the heat pump unit 13 is in the reverse connection state, the heat storage fluid in the upper part of the hot water storage tank 11 flows into both the inlet piping 36 and the intake piping 43. At this time, the detected temperature of the bath primary thermistor 45 provided in the intake pipe 43 is approximately the same as the detected temperature of the inflow side thermistor 13a provided in the inlet pipe 36, and the difference between the detected temperatures of the thermistors 13a and 45 is different. There is almost no.

  Subsequently, it is determined whether or not a predetermined time (for example, about 30 seconds) has elapsed since the start of the start of the bath primary pump 44 (S32). As a result, when it is determined that a predetermined time has elapsed since the start of the start of the bath primary pump 44, the temperature of the upper part of the hot water storage tank 11 at the start of boiling is set to a preset reference temperature (for example, 40 ° C. It is determined whether or not the above is true (S33). This determination process is performed based on the temperature of the upper part of the hot water storage tank 11 (detected value of the first water temperature thermistor 111) detected in the trial operation start process (S11 in FIG. 3).

  If it is determined in the determination process of step S33 that the temperature of the upper portion of the hot water storage tank 11 at the start of boiling is lower than the reference temperature, the detected temperatures of the bath primary thermistor 45 and the inflow side thermistor 13a are acquired. Then, the temperature difference ΔT between the detected values of the thermistors 13a and 45 is calculated (S34). In step S34, a value obtained by subtracting the detected temperature of the inflow thermistor 13a from the detected temperature of the bath primary thermistor 45 is calculated as the temperature difference ΔT of the detected values of the thermistors 13a and 45.

  Subsequently, it is determined whether or not the state in which the temperature difference ΔT calculated in step S34 is lower than a preset first determination threshold value ΔTh1 is continued for a predetermined time (for example, 5 seconds) (S35). The first determination threshold value ΔTh1 is set in advance on the basis of the difference between the detected temperatures of the thermistors 13a and 45 assumed when the piping between the boiling circuit 12 and the heat pump unit 13 is in a reverse connection state. Value (for example, about 3 ° C.).

  As described above, when the piping between the boiling circuit 12 and the heat pump unit 13 is in a normal connection state, the detected temperature of the bath primary thermistor 45 is higher than the detected temperature of the inflow side thermistor 13a. On the other hand, when the piping between the boiling circuit 12 and the heat pump unit 13 is reversely connected, there is almost no temperature difference between the detected temperature of the bath primary thermistor 45 and the detected temperature of the inflow side thermistor 13a.

  For this reason, when it is determined in step S35 that the temperature difference ΔT is lower than the first determination threshold value ΔTh1 for a predetermined time, the piping between the boiling circuit 12 and the heat pump unit 13 is reversed. A connection abnormality flag indicating whether or not it is in a connected state is set to ON (S36). In this connection abnormality flag, “ON” indicates a reverse connection state, and “OFF” indicates a normal connection state. Note that the ON / OFF state of the connection abnormality flag is stored in a memory (for example, EEPROM) of the control unit 100 so that it can be referred to even after the trial run is completed.

  On the other hand, if it is determined in step S35 that the temperature difference ΔT is lower than the first determination threshold ΔTh1 for a predetermined time, the set water level confirmation process (S17 in FIG. 3) is completed. It is determined whether or not (S37).

  As a result, when it is determined that the set water level confirmation process has not been completed, the process returns to step S34. On the other hand, if it is determined that the set water level confirmation process has been completed, it can be determined that the piping between the boiling circuit 12 and the heat pump unit 13 is in a normal connection state, so the above-described connection abnormality flag is turned off (normal Connection state) is set (S38).

  Further, in the determination process of step S33 described above, when it is determined that the temperature of the upper part of the hot water storage tank 11 at the start of boiling is equal to or higher than the reference temperature, each of the thermistors 13a and 45 is similar to the process of step S34. A temperature difference ΔT of the detected values is calculated (S39).

  Subsequently, it is determined whether or not the state in which the temperature difference ΔT calculated in step S39 is lower than a preset second determination threshold value ΔTh2 is continued for a predetermined time (for example, 5 seconds) (S40).

  Here, the second determination threshold value ΔTh2 is smaller than the first reference threshold value ΔTh1 (for example, 0.5 ° C.) so that the determination threshold value becomes smaller according to the temperature rise at the upper part of the hot water storage tank 11 at the start of boiling. Degree).

  The reason for this is as follows. As described above, when the piping between the boiling circuit 12 and the heat pump unit 13 is in a normal connection state, the intake piping 43 includes a hot water storage tank in addition to the heat storage fluid heated by the heat pump unit 13. The heat storage fluid from the upper part of 11 flows. At this time, if the temperature of the upper part of the hot water storage tank 11 at the start of boiling is high (for example, 40 ° C. or higher), the hot water storage tank 11 is provided in the intake pipe 43 due to the influence of the heat storage fluid. The detected temperature of the bath primary thermistor 45 is changed. If the variation in the detected temperature of the bath primary thermistor 45 acts in a direction to reduce the difference in the detected temperature of each thermistor 13a, 45, it is erroneously determined that the normal connection state is the reverse connection state in the reverse connection determination. There is a concern that For this reason, in this embodiment, in order to avoid an erroneous determination in the reverse connection determination, the determination threshold value is reduced according to the temperature rise of the upper portion of the hot water storage tank 11 at the start of boiling.

  If it is determined in step S40 that the temperature difference ΔT is lower than the second determination threshold ΔTh2 for a predetermined time, the connection abnormality flag is set to ON (reverse connection state) (S41). .

  On the other hand, when it is determined in step S40 that the temperature difference ΔT is lower than the second determination threshold value ΔTh2 for a predetermined time, the set water level confirmation process (S17 in FIG. 3) is completed. It is determined whether or not (S42).

  As a result, when it is determined that the set water level confirmation process has not been completed, the process returns to step S39. On the other hand, if it is determined that the set water level confirmation process has been completed, it can be determined that the piping between the boiling circuit 12 and the heat pump unit 13 is in a normal connection state, so the above-described connection abnormality flag is turned off (normal Connection state) is set (S43).

  Subsequently, in steps S36, S38, S41, and S43, an on / off state of the connection abnormality flag is set, and then an output process (S44) for outputting the determination result of the reverse connection determination to the operation unit 120 is performed. Thereafter, the operation of the bath primary pump 44 is stopped (S45), and the reverse connection determination process is terminated.

  Here, in the output process of step S44, when the connection abnormality flag is set to ON (reverse connection state) in the processes of steps S36 and S41, an error signal indicating that fact is output to the operation unit 120. Thereby, in the operation part 120, it alert | reports to an operator that the piping between the boiling circuit 12 and the heat pump unit 13 is a reverse connection state. For example, as illustrated in FIG. 9, the operation unit 120 displays “Pipe Check: Abnormal” on the display unit 120 b to notify the operator that the connection is in the reverse connection state. Note that the notification that the worker is in the reverse connection state is not limited to the display unit 120b, and may be performed by audio output from the speaker 120c.

  In the output process of step S44, when the connection abnormality flag is set to OFF (normal connection state) in the processes of steps S38 and S43, a confirmation signal indicating that is output to the operation unit 120. Thereby, in the operation part 120, it alert | reports to an operator that the piping between the boiling circuit 12 and the heat pump unit 13 is a normal connection state. For example, as shown in FIG. 10, the operation unit 120 displays “pipe confirmation: normal” on the display unit 120 b to notify the operator that the connection is normal. The notification that the worker is in the normal connection state is not limited to the display unit 120b, and may be performed by sound output from the speaker 120c.

  Here, for example, when the power supply to the hot water supply device 10 is interrupted, there is a possibility that the hot water filling test operation and the reverse connection determination process by the control unit 100 are interrupted. Assuming such a situation, when the hot water supply device 10 is restarted, the control unit 100 outputs a warning signal indicating that the hot water filling test run or the reverse connection determination process has not been performed or has not been completed to the operation unit 120. It is desirable to notify the operator from the operation unit 120 to that effect.

  In the hot water supply device 10 of the present embodiment described above, the control unit 100 performs the hot water filling test operation and the reverse connection determination for determining whether or not the piping between the boiling circuit 12 and the heat pump unit 13 is in a reverse connection state. And run. Thereby, in the hot water supply apparatus 10 of this embodiment, the time required for the test operation of the hot water supply apparatus 10 can be shortened as compared with the case where the hot water filling test operation and the reverse connection determination are individually performed.

  Moreover, in this embodiment, the control part 100 is a flow volume adjustment means during execution of the water level confirmation process of the hot water filling test operation in which the heat storage fluid and the hot water supply water do not substantially exchange heat in the bath heat exchanger 42. The bath primary pump 44 is operated to perform reverse connection determination.

  According to this, the detected temperature of the bath primary thermistor 45 and the inflow side thermistor 13a used for reverse connection determination hardly changes due to heat exchange between the heat storage fluid and the hot water supply water in the bath heat exchanger 42. For this reason, according to the hot water supply apparatus 10 of this embodiment, in the control part 100, it can be determined appropriately whether the piping between the heat pump units 13 is a reverse connection state.

  Further, in the present embodiment, in the reverse connection determination process executed by the control unit 100, the determination threshold is set to be smaller in accordance with the temperature rise at the top of the hot water storage tank 11 at the start of boiling. According to this, it can suppress that the temperature state of the upper part of the hot water storage tank 11 at the time of a boiling start influences the determination result of reverse connection determination. Therefore, according to the hot water supply apparatus 10 of the present embodiment, it is possible to appropriately determine whether or not the piping between the heat pump units 13 is in a reverse connection state.

  Further, in the present embodiment, a display unit 120b and a speaker 120c are provided as notification means for notifying the determination result of the reverse connection determination process by the remote controllers 121 and 122 constituting the operation unit 120. According to this, it is possible to appropriately notify the determination result of the reverse connection determination process to the worker (construction contractor or serviceman).

  Furthermore, the bath primary thermistor 45 and the inflow side thermistor 13a used in the reverse connection determination of the present embodiment are provided to adjust the heat exchange capability of the bath heat exchanger 42 and the heating capability of the heat pump unit 13. Existing sensors.

  That is, in the present embodiment, the reverse connection determination is performed using the inflow side thermistor 13a used for adjusting the heating capacity of the heat pump unit 13 and the bath primary thermistor 45 used for adjusting the heat exchange capacity of the bath heat exchanger 42. Is going. According to this, it is possible to suppress the addition of a dedicated device for determining whether or not the piping between the heat pump units 13 is in a reverse connection state.

(Second Embodiment)
Next, a second embodiment will be described. This embodiment demonstrates the example which changed the piping structure between the boiling circuit 12 and the thermal load circuit 14 with respect to 1st Embodiment. In the present embodiment, description of the same or equivalent parts as in the first embodiment will be omitted or simplified.

  As shown in FIG. 11, the extraction pipe 41 of the thermal load circuit 14 of the present embodiment is connected to the downstream side of the flow path switching valve 34 in the return pipe 32 for boiling. A heat storage switching valve 26 is provided at a connection portion between the take-out pipe 41 and the boiling return pipe 32.

  The heat storage switching valve 26 is a three-way valve that switches the flow path of the heat storage fluid flowing through the boiling return pipe 32 to a flow path toward the upper part of the hot water storage tank 11 and a flow path toward the extraction pipe 41. Note that the heat storage switching valve 26 of the present embodiment is configured to be able to adjust the flow rate ratio between the flow rate of the heat storage fluid flowing toward the upper portion of the hot water storage tank 11 and the flow rate of the heat storage fluid flowing through the extraction pipe 41.

  The heat storage switching valve 26 is set as a flow path where the heat storage fluid that has passed through the flow path switching valve 34 is directed to the extraction pipe 41 when the bath primary pump 44 is operated. The heat storage fluid that has passed through the switching valve 34 is set in the flow path toward the upper portion of the hot water storage tank 11.

  If the bath primary pump 44 is operated when the flow path switching valve 34 is set to the flow path toward the upper part of the hot water storage tank 11 and the heat storage switching valve 26 is set to the flow path toward the take-out piping 41. The heat storage fluid in the return pipe 32 for boiling flows as follows. That is, the heat storage fluid in the boiling return pipe 32 flows in the order of the extraction pipe 41 → the bath heat exchanger 42 → the intake pipe 43 → the hot water storage tank 11.

  On the other hand, when both the flow path switching valve 34 and the heat storage switching valve 26 are set to flow paths directed to the upper part of the hot water storage tank 11, the heat storage fluid in the return pipe 32 for boiling flows into the extraction pipe 41. It flows to the upper part of the hot water storage tank 11 without.

  As described above, in this embodiment, the flow rate of the heat storage fluid flowing from the boiling return pipe 32 to the extraction pipe 41 is adjusted by the operation of the bath primary pump 44 and the setting of the flow path switching valve 34 and the heat storage switching valve 26. Is done. Therefore, in this embodiment, the bath primary pump 44, the flow path switching valve 34, and the heat storage switching valve 26 adjust the flow rate of the heat storage fluid flowing from the boiling return pipe 32 to the extraction pipe 41 "flow rate adjusting means". Is comprised.

  Other configurations are the same as those of the first embodiment, and hereinafter, control of the heat storage switching valve 26 by the control unit 100 of the present embodiment will be described. The control unit 100 of the present embodiment is configured so that the heat storage fluid that has passed through the flow path switching valve 34 becomes a flow path toward the upper portion of the hot water storage tank 11 during the boiling operation in which the bath primary pump 44 is not operated. The heat storage switching valve 26 is controlled. As a result, the heat storage fluid that has passed through the flow path switching valve 34 flows to the upper part of the hot water storage tank 11 as indicated by the one-dot chain arrow in FIG.

  On the other hand, the control unit 100 according to the present embodiment is configured so that the heat storage fluid that has passed through the flow path switching valve 34 is directed to the extraction pipe 41 during the execution of the follow-up operation for operating the bath primary pump 44 or the reverse connection determination process. Then, the heat storage switching valve 26 is controlled. As a result, the heat storage fluid that has passed through the flow path switching valve 34 flows to the extraction pipe 41 → the bath heat exchanger 42 → the intake pipe 43 → the hot water storage tank 11 as indicated by a two-dot chain line arrow in FIG.

  Here, in the present embodiment, the heat storage switching valve 26 is controlled so that the heat storage fluid that has passed through the flow path switching valve 34 becomes a flow path toward the extraction pipe 41 during execution of the reverse connection determination process. During the operation of the next pump 44, the heat storage fluid in the upper part of the hot water storage tank 11 does not flow to the extraction pipe 41.

  For this reason, in the structure of this embodiment, the temperature of the upper part of the hot water storage tank 11 at the start of boiling has little influence on the detected temperature of each thermistor 13a, 45 used for reverse connection determination. That is, in the configuration of the present embodiment, unlike the first embodiment, it is not necessary to reduce the determination threshold according to the temperature rise in the upper part of the hot water storage tank 11 at the start of boiling in the reverse connection determination process.

  Therefore, in the reverse connection determination process of the present embodiment, as shown in FIG. 12, the determination threshold value is not changed according to the temperature rise at the top of the hot water storage tank 11 at the start of boiling.

  Here, the control process shown in FIG. 12 is obtained by omitting the processes in steps S33 and S39 to S43 in FIG. 6, and the other steps are the same as those in the first embodiment. For this reason, regarding the control process of FIG. 12, the description of 1st Embodiment is quoted and the description is abbreviate | omitted.

  In the hot water supply device 10 of the present embodiment described above, the control unit 100 performs the hot water filling test operation and the reverse connection determination for determining whether or not the piping between the boiling circuit 12 and the heat pump unit 13 is in a reverse connection state. And run.

  Moreover, in this embodiment, the control part 100 is a flow volume adjustment means during execution of the water level confirmation process of the hot water filling test operation in which the heat storage fluid and the hot water supply water do not substantially exchange heat in the bath heat exchanger 42. The bath primary pump 44 is operated to perform reverse connection determination.

  Therefore, in the hot water supply apparatus 10 of the present embodiment, the time required for the test operation of the hot water supply apparatus 10 can be shortened, and the control unit 100 determines whether or not the piping between the heat pump units 13 is in a reverse connection state. It can be judged appropriately.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment, In the range described in the claim, it can change suitably. For example, various modifications are possible as follows.

  (1) In each of the above-described embodiments, the example in which the hot water supply water is the same as that of the hot water supply side has been described. However, the present invention is not limited to this, and a fluid different from the hot water supply water may be employed as the heat storage fluid. In this case, a heat exchanger for exchanging heat between the heat storage fluid in the hot water storage tank 11 and the hot water supply water may be added.

  (2) In each of the above-described embodiments, the detected value of the first water temperature thermistor 111 is the temperature of the heat storage fluid in the upper part of the hot water storage tank 11, but is not limited to this. For example, the average value of the detection values of the first and second water temperature thermistors 111 and 112 may be set as the temperature of the heat storage fluid in the upper part of the hot water storage tank 11.

  (3) In each of the above-described embodiments, the example in which the water level sensor 87 is configured by a pressure sensor has been described. However, the present invention is not limited to this. For example, a float type water level meter may be employed as the water level sensor 87.

  (4) In each of the above-described embodiments, the example in which the reverse connection determination process is performed during the execution of the set water level confirmation process of the hot water trial operation is described. However, the present invention is not limited thereto. The reverse connection determination process may be executed during the execution of the above.

  (5) In each of the above-described embodiments, the example in which the reference water level confirmation process and the set water level confirmation process are performed as the water level confirmation process during the hot water filling test operation has been described. It may be omitted and only the set water level confirmation process may be performed.

  (6) In each of the above-described embodiments, in the reverse connection determination process, it is normal when the temperature difference ΔT between the detected temperatures of the thermistors 13a, 45 is lower than the determination threshold value until the set water level confirmation process is completed. Although it is determined that the connection state is established, the present invention is not limited to this. For example, in the reverse connection determination process, when the state in which the temperature difference ΔT is lower than the determination threshold is not continued for a predetermined time (for example, 45 seconds), it may be determined that the connection state is normal.

  (7) As in the above-described embodiments, using existing sensors such as the bath primary thermistor 45 and the inflow side thermistor 13a, it is determined whether or not the piping between the heat pump units 13 is in a reverse connection state. Although desirable, it is not limited to this. For example, a dedicated thermistor for determining whether or not the piping between the heat pump units 13 is in a reverse connection state is added to the inlet piping 43 and the inlet piping 36, and is the reverse connection state depending on the detected temperature of the thermistor? It may be determined whether or not.

  (8) In each of the above-described embodiments, the elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Needless to say.

  (9) In each of the above-described embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, the specific number is clearly specified when clearly indicated as essential. It is not limited to the specific number except when limited to.

  (10) In each of the above-described embodiments, when referring to the shape, positional relationship, etc. of the component, etc., unless otherwise specified and in principle limited to a specific shape, positional relationship, etc. It is not limited to shape, positional relationship, and the like.

11 Hot water storage tank (tank)
12 Boiling circuit 13 Heat pump unit (heating unit)
13a Inflow side thermistor (second temperature detection means)
31 Boiling forward piping 32 Boiling return piping 36 Inlet piping 37 Outlet piping 42 Bath heat exchanger (heat exchanger for heat load)
45 Bath side primary thermistor (first temperature detection means)
100a Operation control means (control unit)
100b Reverse connection determination means (control unit)

Claims (6)

A tank (11) for storing heat storage fluid therein;
A heating section (13) for heating the heat storage fluid introduced from the inlet pipe (36) and leading out from the outlet pipe (37);
Boiling forward pipe (31) connecting the lower part of the tank and the inlet pipe, boiling return pipe (32) connecting the upper part of the tank and the outlet pipe, and the inlet pipe → the heating unit → a boiling circuit (12) having a boiling pump (33) for flowing the heat storage fluid in the order of the outlet pipe;
An extraction pipe (41) connected to the return pipe for boiling, and a heat load heat exchanger (42) for exchanging heat between the heat storage fluid that has passed through the extraction pipe and hot water used on the heat load side A heat load circuit (14) having an intake pipe (43) for returning the heat storage fluid that has passed through the heat load heat exchanger to the tank;
A bathtub introduction pipe (82) for guiding the hot water supply water that has passed through the heat load heat exchanger to the bathtub (51) to which the hot water supply water is supplied, and passes through the heat load heat exchanger via the bathtub introduction pipe A bathtub circuit (70, 80) having a bathtub supply means (71, 84) for supplying the hot water supply water to the bathtub;
Flow rate adjusting means (26, 34, 44) for adjusting the flow rate of the heat storage fluid flowing from the boiling return pipe to the extraction pipe;
First temperature detection means (45) for detecting the temperature of the heat storage fluid passing through the intake pipe;
Second temperature detecting means (13a) for detecting the temperature of the heat storage fluid passing through the inlet pipe;
An operation control means (100a) for operating the heating unit and the boiling pump and operating the bathtub supply means to supply the hot water supply water to the bathtub.
Reverse connection determining means (100b) for determining whether or not the outlet pipe is connected to the boiling forward pipe and the inlet pipe is connected to the boiling return pipe. Prepared,
The operation control means performs a water level confirmation process of stopping the operation of the bathtub supply means and confirming a change in the water level of the bathtub with respect to the supply amount of the hot water supply water to the bathtub during execution of the hot water filling test operation. And controlling the flow rate adjusting means so that the heat storage fluid flows from the boiling return pipe to the extraction pipe during the water level confirmation process,
The reverse connection determination unit is configured so that a difference between a detection value of the first temperature detection unit and a detection value of the second temperature detection unit is smaller than a predetermined determination threshold value during execution of the water level confirmation process by the operation control unit. A hot water supply device that determines that the reverse connection state is established.   During the execution of the water level confirmation process, the operation control means causes the heat storage fluid flowing through the heating unit and the heat storage fluid in the upper part of the tank to each of the extraction pipes via the boiling return pipe. The hot water supply apparatus according to claim 1, wherein the flow rate adjusting means (34, 40) is controlled to flow. Third temperature detecting means (111) for detecting the temperature of the heat storage fluid in the upper part of the tank,
The hot water supply apparatus according to claim 2, wherein the reverse connection determination unit decreases the determination threshold in accordance with an increase in a detection value of the third temperature detection unit. An operation unit (120) for requesting the operation control means to perform the hot water filling test operation;
The operation unit is provided with notifying means (120b, 120c) for notifying that when the reverse connection determination means determines that the reverse connection state is established. The hot water supply apparatus as described in any one of thru | or 3.   The operation control means adjusts the heat exchange capability of the heat exchanger for heat load using the detection value of the first temperature detection means, and uses the detection value of the second temperature detection means to perform the heating. The hot water supply device according to any one of claims 1 to 4, wherein the heating capacity of the section is adjusted. Water level detecting means (87) for detecting the water level of the hot water supply water in the bathtub;
The hot water supply apparatus according to any one of claims 1 to 5, wherein the operation control unit executes the water level confirmation process based on a detection value of the water level detection unit.

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