JP2009109093A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water heater 11 capable of determining that a going passage 71 for boiling up and a returning passage 72 for boiling up of a boiling-up circuit 70 is in a reverse connection state in a short time. <P>SOLUTION: A heat pump unit 75 and a circulation pump 77 for boiling up of the boiling-up circuit 70 are operated in starting a boiling-up operation, and a circulation pump 47 for reheating of a reheating circuit 49 is operated after the lapse of a prescribed time from the start of the boiling-up operation. When a temperature of hot water detected by a hot water supply temperature detecting sensor 41 of the reheating circuit 49 is higher than a prescribed boiling-up temperature, it is determined that the going passage 71 for boiling up and the returning passage 72 for boiling up of the boiling-up circuit 70 are normally connected. When the temperature of the hot water is lower than the prescribed boiling up temperature, it is determined that the going passage 71 for boiling up and the returning passage 72 for boiling up of the boiling-up circuit 70 are reversely connected. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a water heater using a heat pump unit for boiling hot water stored in a hot water storage tank.

  Conventionally, in a hot water supply device that uses a heat pump to boil hot water stored in a hot water storage tank, during boiling operation, water is taken out from the lower part of the hot water storage tank and heated to a predetermined boiling temperature with a heat pump unit. The hot water is circulated by the boiling circulation pump so that the hot water is taken into the upper part of the hot water storage tank, so that the specific gravity difference between the hot water and the water at different temperatures causes the hot water between the upper hot water and the lower hot water. Hot water is stored in order from the upper side in the hot water storage tank without being mixed with water through the formed hot water and water mixture layer.

  Hot water stored in the hot water storage tank is taken out from the upper part of the hot water storage tank and used for hot water supply, and also used as a heat source for heat load such as reheating and heating of the hot water in the bathtub.

  Also, the hot water storage tank and the heat pump unit are installed separately, and between them, a boiling forward path connecting the lower part of the hot water storage tank and the heat pump, and a boiling point connecting the heat pump unit and the upper part of the hot water storage tank. A return circuit is connected to form a boiling circuit. Then, the water in the lower part of the hot water storage tank is circulated in the direction of returning to the upper part of the hot water storage tank via the heat pump unit and the return return path through the heat pump unit and the return return path for boiling by the circulating pump for boiling provided in the heat pump unit. By doing so, normal boiling operation is possible.

  However, when the hot water supply apparatus is installed, there is a case in which the piping of the boiling forward path and the piping of the boiling return path are reversely connected. In particular, this phenomenon is likely to occur when the piping for the boiling forward path and the boiling return path connecting the hot water storage tank and the heat pump unit are buried in the ground or concrete.

  When the boiling operation is performed in the trial operation after the installation of the hot water supply device, the heat pump unit is connected from the upper part of the hot water storage tank if the piping of the boiling forward path and the piping of the return path for boiling are reversely connected. Since the hot water is taken out and boiled, and the boiled hot water is circulated back to the lower part of the hot water storage tank, the hot water returned to the lower part of the hot water storage tank only warms the water in the hot water storage tank. It is not possible to store hot water in the upper temperature sequentially from the upper side of the hot water storage tank.

  Therefore, as a method for detecting that the piping for the heating forward path and the piping for the return return path are reversely connected, a plurality of remaining hot water amount detection sensors for detecting the remaining hot water amount in the hot water storage tank are used. For example, the determination can be made based on whether the temperature detected by the remaining hot water amount detection sensor that detects, for example, the remaining hot water amount of 60 liters reaches a predetermined boiling temperature within a predetermined time.

  However, since the boiling flow rate by the heat pump unit is about 1 liter per minute, even if the remaining hot water amount detection sensor for detecting the remaining hot water amount, for example, 60 liters is used, it is more than 1 hour to determine the reverse connection. It takes time.

  In addition, a water supply temperature detection sensor is provided in the boil-up return path, and a boiling temperature detection sensor is provided in the boil-up return path. If the connection is reverse, hot water boiled up by the heat pump unit is detected by the water supply temperature detection sensor. In order to do this, there are some which are determined to be in the reverse connection state when the temperature detected by the feed water temperature detection sensor is higher than the temperature detected by the boiling temperature detection sensor by a predetermined temperature or more.

However, during the boiling operation, the feed water temperature detection sensor detects hot water that has reached the lower part of the hot water storage tank near the completion of boiling and is taken out to the boiling path, and detects hot water above this predetermined temperature. Since it is used to determine the completion of boiling, there is a risk of erroneous detection of completion of boiling. For this reason, detection by the remaining hot water amount detection sensor is used in combination to determine reverse connection (for example, see Patent Document 1).
Japanese Patent No. 3969383 (page 5-6, FIG. 1-5)

  As described above, in the conventional hot water supply apparatus, there is a problem that it takes time to determine whether to reversely connect the piping of the boiling forward path and the piping of the return path for boiling.

  This invention is made in view of such a point, and provides the hot water supply apparatus which can determine in a short time that the going-up route for boiling and the return route for boiling are in a reverse connection state. With the goal.

  The hot water supply apparatus according to claim 1, wherein the hot water storage tank for storing hot water, the heat pump unit for boiling the hot water, the forward path for boiling connecting the lower portion of the hot water storage tank and the heat pump, the heat pump unit and the hot water storage are provided. A return path for boiling connecting to the upper part of the tank, and water in the lower part of the hot water tank is circulated in a direction returning from the forward path for boiling to the upper part of the hot water tank via the heat pump unit and the return path for boiling. A heating circuit having a circulating pump for boiling, a take-out path for taking out hot water from the upper part of the hot water storage tank, a heat exchanger for heat load for exchanging heat from the hot water taken out in the take-out path with the heat load side, and this heat An intake path for returning hot water that has passed through the load heat exchanger to the hot water storage tank, and hot water from the hot water storage tank via the heat load heat exchanger and the intake path from the hot water storage tank. A heat load circulating pump for circulating in a direction to return to the tank, a hot water supply temperature detecting means for detecting the temperature of hot water taken out to the take-out path, the heat pump unit and the boiling circuit at the start of the boiling operation The temperature of the hot water detected by the hot water supply temperature detecting means of the thermal load circuit is operated after a predetermined time has elapsed since the start of the boiling operation. If the temperature is lower than a predetermined boiling temperature, a controller is provided that determines that the boiling forward path and the boiling return path of the boiling circuit are in a reverse connection state.

  The hot water supply device according to claim 2 is the hot water supply device according to claim 1, further comprising a plurality of remaining hot water amount detecting means provided at a plurality of height positions of the hot water storage tank for detecting the remaining hot water amount in the hot water storage tank, The control unit starts the operation of the circulation pump for heat load of the heat load circuit for a predetermined time from the start of boiling operation, when the connection between the boiling forward path and the boiling return path is normal. The time is shorter than the time required to detect the hot water stored in the upper side of the hot water storage tank by the uppermost remaining hot water detection means.

  According to the hot water supply device of the first aspect, at the start of the boiling operation, the heating pump and the boiling circulation pump of the boiling circuit are operated, and after a predetermined time has elapsed from the start of the boiling operation, the heat of the heat load circuit When the load circulation pump is operated and the hot water temperature detected by the hot water supply temperature detection means of the thermal load circuit is lower than the predetermined boiling temperature, the boiling circuit return path and the boiling return path are reversed. Since it can be determined that the connection state is established, reverse connection can be determined in a shorter time than in the past.

  According to the hot water supply device of claim 2, in addition to the effect of the hot water supply device of claim 1, the predetermined time from the start of the boiling operation for starting the operation of the heat load circulation pump of the heat load circuit by the control unit is The hot water stored in the upper part of the hot water storage tank is detected by the uppermost remaining hot water amount detection means when the connection between the boiling forward path and the boiling return path of the boiling circuit is normal. It is a time shorter than the time, and the reverse connection can be determined in a shorter time than conventional.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 2 and FIG. 3, the hot water supply device 11 includes a main body unit 12 and an outdoor unit 13 for boiling hot water, and has a function of adding bath water stretched on the bathtub 14.

  The main unit 12 has a hot water storage tank 17 for storing hot water. The hot water storage tank 17 includes an upper position of the hot water storage tank 17 and a 1/5 position and a 2/5 position corresponding to the capacity from the upper portion of the hot water storage tank 17. Temperature detection sensors 18a to 18f such as a thermistor as temperature detection means for detecting the hot water temperature in the hot water storage tank 17 are disposed at the 3/5 position, the 4/5 position, and the lower position of the hot water storage tank 17, respectively. ing. The temperature detection sensors 18b to 18f at the 1/5 position, the 2/5 position, the 3/5 position, the 4/5 position, and the lower position, excluding the upper temperature detection sensor 18a, detect the amount of remaining hot water in the hot water storage tank 17. It functions as a remaining hot water amount detection means.

  A water supply path 20 connected to a water supply source such as a water pipe is connected to the lower part of the hot water storage tank 17. The water supply path 20 is provided with a pressure reducing valve 21 for reducing the water supply pressure and a check valve 22 for restricting the backflow.

  An upper outlet path 25 is connected to the upper part of the hot water storage tank 17, and an intermediate part between the temperature detection sensor 18b at the 1/5 position and the temperature detection sensor 18c at the 2/5 position, which is an intermediate position in the vertical direction of the hot water storage tank 17. An extraction path 26 is connected. A check valve 27 that allows hot water to flow only in the direction of removing hot water from the intermediate portion of the hot water storage tank 17 is disposed in the intermediate portion extraction path 26. The upper take-out path 25 and the intermediate take-out path 26 are connected to a regulating valve 28 that is an electric valve as a take-out ratio adjusting means, and the regulating valve 28 allows the hot water in the upper part of the hot water storage tank 17 to be taken out from the upper take-out path 25 to The hot water storage tank 17 to be taken out from the intermediate part take-out path 26 is taken out by adjusting the mixing ratio with the hot water in the intermediate part. The mixing ratio that can be adjusted by the adjusting valve 28 includes the case where either one is 100% and the other is 0%. The adjustment valve 28 is connected to a hot water supply path 29 for supplying the hot water taken out. The hot water supply path 29 is provided with an extraction temperature detection sensor 30 as an extraction temperature detection means for detecting the temperature of the hot water. The upper extraction path 25, the intermediate section extraction path 26, the regulating valve 28, and the hot water supply path 29 form an extraction path 31 for extracting hot water from the hot water storage tank 17.

  Further, the hot water supply path 29 (extraction path 31) and the water supply path 20 are respectively connected to a mixing valve 34 as hot water temperature adjusting means for hot water supply and a mixing valve 35 as hot water temperature adjusting means for bathtubs. These mixing valves 34 and 35 mix hot water from the hot water supply path 29 (extraction path 31) and water from the water supply path 20 to supply hot water at a predetermined temperature. The mixing ratio that can be adjusted by the mixing valves 34 and 35 includes the case where either one is 100% and the other is 0%. The hot water supply path 29 and the water supply path 20 connected to the mixing valves 34 and 35 are provided with check valves 36 and 37 for restricting the back flow to the hot water supply path 29 side and the water supply path 20 side, respectively.

  The hot water mixing valve 34 supplies hot water having a hot water supply set temperature set by, for example, a main remote controller installed in a kitchen or the like, a bathroom remote controller installed in a bathroom, or the like. A hot water supply passage 38 for supplying hot water to a predetermined hot water supply place is connected to the mixing valve 34 for hot water supply, and a flow rate sensor 39 for measuring the flow rate and a hot water supply temperature detection sensor 40 for detecting the hot water supply temperature are disposed in the hot water supply passage 38. Has been.

  The mixing valve 35 for the bathtub supplies hot water at a hot water set temperature set by the main remote controller installed in the kitchen or the bathroom or the bathroom remote controller installed in the bathroom, for example, or at the time of reheating operation by the bathroom remote controller Supply hot water at a temperature according to the water repulsion ability.

  A hot water supply temperature detection sensor 41 such as a thermistor as a hot water supply temperature detection means is provided downstream of the location of the mixing valve 35 in the hot water supply route 29 (extraction route 31). A hot water supply path 42 is connected. The bathtub hot water supply path 42 is provided with a hopper 43 provided with a water supply electromagnetic valve or the like as a hot water supply means for bathtubs for opening and closing the flow path.

  In addition, on the downstream side of the installation location of the mixing valve 35 in the hot water supply path 29 (extraction path 31), a check valve 44 that restricts the backflow to the upstream side and heat exchange with the bathtub water in the bathtub 14 on the heat load side An intake path 46 for returning the hot water that has passed through the heat exchanger 45 for reheating to the hot water storage tank 17 is connected via a heat exchanger 45 for reheating as a heat exchanger for heat load. This intake path 46 is connected between the temperature detection sensor 18d at the 3/5 position and the temperature detection sensor 18e at the 4/5 position, which is an intermediate position in the vertical direction of the hot water storage tank 17. In this intake path 46, the hot water is circulated so that the hot water is taken out from the hot water storage tank 17 through the extraction path 31 and the hot water having passed through the heat exchanger 45 is returned to the hot water storage tank 17 through the intake path 46. A memory circulation pump 47 as a load circulation pump is provided.

  The take-out route 31 and the take-in route 46 form a recirculation circuit 48 as a heat load circuit, the recirculation circuit 48, the recuperation heat exchanger 45, and the recirculation circulation pump 47. A memorial circuit 49 as a heat load circuit is formed.

  In addition, the memorial heat exchanger 45 and the bathtub 14 are connected by a circulation path 54 for the bathtub. The circulation path 54 for the bathtub includes a return pipe 55 that takes in the bathtub water of the bathtub 14 and guides it to the heat exchanger 45 for reheating, and a forward pipe 56 that guides the bathtub water that has passed through the heat exchanger 45 for reheating to the bathtub 14. Have. The return pipe 55 has a water temperature detection sensor 57 such as a thermistor that detects the temperature of the bathtub water taken from the bathtub 14, a pressure sensor 58 that detects the water level of the bathtub 14, and a flow path when automatically filling the bathtub 14. A switching valve 59 for switching, a circulation pump 60 for circulating the bathtub water, and a flow switch 61 for detecting the circulation of the bathtub water are provided. The outgoing pipe 56 is provided with a memory temperature detection sensor 62 such as a thermistor for detecting the temperature of the bathtub water introduced into the bathtub 14.

  The switching valve 59 is connected to a hot water supply passage 42 for the bathtub, and hot water supplied from the hot water supply passage 42 for the bathtub can be supplied to the bathtub 14 through one pipe of the return pipe 55 or two pipes of the return pipe 55 and the forward pipe 56. It has become.

  In addition, a relief valve 65 that releases excess pressure during boiling is connected to the upper outlet passage 25 of the hot water storage tank 17, and this relief valve 65 is connected to a drainage passage 66. The lower part of the hot water storage tank 17 and the drainage path 66 are connected via a drain valve 67 that drains the water in the hot water storage tank 17.

  Further, the hot water storage tank 17 side and the outdoor unit 13 are connected by a boiling circuit 70 having a boiling circulation path 70a. A boiling circulation path 70a of the boiling circuit 70 includes a boiling forward path 71 connecting the lower part of the hot water storage tank 17 and the inlet side of the outdoor unit 13, the outlet side of the outdoor unit 13, and the upper part of the hot water storage tank 17. And a return path 72 for boiling.

  The outdoor unit 13 is provided with a heat pump unit 75 that boils hot water. The heat pump unit 75 has a refrigerant circuit including a compressor, a boiling heat exchanger 76 that functions as a condenser, an expansion valve, an evaporator, and the like. A boiling circuit 70 is connected to the boiling heat exchanger 76 of the heat pump unit 75. On the upstream side of the boiling heat exchanger 76 of the heat pump unit 75, there is a boiling circulation pump 77 that circulates the water in the lower part of the hot water storage tank 17 from the boiling forward path 71 side to the boiling return path 72 side. It is arranged.

  The hot water supply device 11 includes a control unit 81 that controls the hot water supply device 11. This control unit 81 operates the heat pump unit 75 and the boiling circulation pump 77 of the boiling circuit 70 during the trial operation after the hot water supply device 11 is installed, that is, at the start of the first boiling operation after the power is turned on. After the elapse of a predetermined time from the start of the upper operation, if the circulation pump 47 for the chasing circuit 49 is operated and the hot water temperature detected by the hot water supply temperature detecting sensor 41 of the chasing circuit 49 is lower than the predetermined boiling temperature, The boiling circuit 70 has a function of determining that the boiling forward path 71 and the boiling return path 72 are in a reverse connection state.

  The predetermined time from the start of the boiling operation in which the controller 81 starts the operation of the circulating pump 77 for the boiling circuit 70 is determined between the boiling forward path 71 and the boiling return path 72 of the boiling circuit 70. It is shorter than the time (about 1 hour) required to detect the hot water stored in the upper part of the hot water storage tank 17 by the temperature detection sensor 18b at the uppermost 1/5 position that detects the remaining hot water amount when the connection is normal. The time, for example, is set to about 15 minutes.

  Next, the operation of the present embodiment will be described.

  First, the hot water storage operation of the hot water storage tank 17 using the heat pump unit 75 will be described. Here, it is assumed that the boiling forward path 71 and the boiling return path 72 of the boiling circuit 70 are normally connected.

  As indicated by the black display of the piping path in FIG. 2 and the arrows, the heat pump unit 75 of the outdoor unit 13 and the boiling circulation pump 77 are used as the specific boiling time period, for example, in the night time period of the hourly lighting system. Drive. By operating the boiling circulation pump 77, the water in the lower part of the hot water storage tank 17 is taken out from the boiling forward passage 71 and sent to the heat pump unit 75, and the water heated to a predetermined boiling temperature by the heat pump unit 75 is boiled. From the upper return path 72, the hot water is returned to the upper part of the hot water storage tank 17, and the hot water set in advance or the entire hot water of the hot water storage tank 17 is stored from the upper side of the hot water storage tank 17.

  Next, the hot water supply operation will be described.

  By opening a hot water tap or the like disposed on the downstream side of the hot water supply path 38, the hot water in the hot water storage tank 17 is pushed out by the supply water pressure, and through the upper outlet path 25, the intermediate part outlet path 26, the regulating valve 28 and the hot water path 29. The hot water taken out from the hot water storage tank 17 and the water supplied from the water supply path 20 are mixed by the hot water mixing valve 34 to obtain hot water having a predetermined hot water supply temperature, and this hot water is supplied from the hot water supply passage 38. The hot water taken out to the hot water supply passage 29 is adjusted by adjusting the mixing ratio between the hot water in the upper portion of the hot water storage tank 17 taken out from the upper take-out passage 25 and the hot water in the intermediate portion of the hot water storage tank 17 taken out from the intermediate take-out passage 26 by the adjusting valve 28. Take out.

  Next, use of the bathtub 14 will be described.

  When filling the bathtub 14 with hot water, the hot water in the hot water storage tank 17 is pushed out by the water supply pressure by opening the water supply electromagnetic valve of the hopper 43, and the upper outlet path 25, the intermediate outlet path 26, the regulating valve 28 and the hot water path The hot water taken out from the hot water storage tank 17 through the water 29 and the water supplied from the water supply path 20 are mixed by the mixing valve 35 for the bathtub to obtain hot water having a hot water set temperature, and this hot water is supplied to the hot water supply path 42 for the bathtub and Hot water is supplied to the bathtub 14 through the bathtub circulation path 54 constituting a part of the bathtub hot water supply path 42. When filling the bathtub 14 with hot water, by switching the hot water to flow through the return pipe 55 and the forward pipe 56 with the switching valve 59, a predetermined amount of hot water can be quickly supplied and filled. When filling the bathtub 14 with hot water, the switching valve 59 is switched so that hot water flows only to one pipe of the outgoing pipe 56, and hot water is supplied while monitoring the water level with the pressure sensor 58 of the return pipe 55. The hot water can be filled so that the water level exactly matches the set water level. In addition, the hot water taken out to the hot water supply passage 29 is adjusted by the adjustment valve 28 to adjust the mixing ratio of the hot water in the upper portion of the hot water storage tank 17 taken out from the upper take-out passage 25 and the hot water in the intermediate portion of the hot water storage tank 17 taken out from the intermediate portion take-out passage 26. And take it out.

  Then, after filling the bathtub 14, the bathtub circulation pump 60 is operated every predetermined time to circulate the bathtub water in the bathtub 14 in the bathtub circulation path 54, and the bathtub water temperature detection sensor 57 The temperature is detected, and it is monitored whether there is a need for heat insulation, that is, the need for a chasing operation.

  In addition, when the temperature of the bathtub water falls below the set temperature, it automatically retreats, and it can also be remediated by manual operation such as a bathtub remote controller.

  In the reheating operation, as indicated by the black display of the piping path in FIG. 3 and the broken line arrow, first, the bathtub circulation pump 60 is operated, and the bathtub water is taken into the bathtub circulation path 54 to heat the heating. Circulate through exchanger 45. In this state, the hot water in the hot water storage tank 17 is taken out through the upper take-out route 25, the intermediate take-out route 26, the regulating valve 28, and the hot water supply route 29 (take-out route 31) by operating the circulation pump 47 for memory. The hot water from the hot water storage tank 17 is exchanged with the hot water from the hot water storage tank 17 and the hot water from the bathtub 14 by the hot water exchanger 45 for reheating. The hot water temperature in the bathtub 14 is raised. Note that the hot water taken out to the hot water supply path 29 (take-out path 31) is adjusted with the hot water in the upper part of the hot water storage tank 17 taken out from the upper take-out path 25 and the hot water in the middle part of the hot water storage tank 17 taken out from the intermediate part take-out path 26. Adjust and adjust the mixing ratio.

  Further, the hot water from the hot water storage tank 17 that has passed through the memory heat exchanger 45 and whose temperature has dropped is returned to the hot water storage tank 17 through the intake path 46.

  Next, the determination of whether or not the boiling forward path 71 and the boiling return path 72 of the boiling circuit 70 are in the reverse connection state will be described.

  When the hot water supply device 11 is installed, the piping of the heating forward path 71 and the piping of the return path 72 for boiling of the heat pump unit 75 of the outdoor unit 13 are connected to the hot water storage tank 17 side of the main unit 12.

  The heat pump unit 75 and the boiling circulation pump 77 of the outdoor unit 13 are operated at the time of trial operation after installation of the hot water supply device 11, that is, at the start of the first boiling operation after turning on the power.

  At this time, if the connection between the boiling forward path 71 and the boiling return path 72 of the boiling circuit 70 is normal, as shown by the black display of the piping path and the solid arrow in FIG. By operating the circulating pump 77, water in the lower part of the hot water storage tank 17 is taken out from the boiling forward passage 71 and sent to the heat pump unit 75, and the water pumped up to a predetermined boiling temperature by the heat pump unit 75 is used for boiling. The water is returned from the return path 72 to the upper part of the hot water storage tank 17, and hot water having a predetermined boiling temperature is stored from the upper side of the hot water storage tank 17.

  On the other hand, when the boiling forward path 71 and the boiling return path 72 of the boiling circuit 70 are reversely connected, as shown by the black display of the piping path and the solid arrow in FIG. By operating the upper circulation pump 77, the water in the upper part of the hot water storage tank 17 is taken out from the return path 72 for boiling and sent to the heat pump unit 75, and the water pumped up to a predetermined boiling temperature by the heat pump unit 75 is boiled up. Return to the lower part of the hot water storage tank 17 from the outgoing route 71. Therefore, the hot water returned to the lower part of the hot water storage tank 17 is mixed with the water in the lower part of the hot water storage tank 17 and the temperature is lowered, and hot water having a predetermined boiling temperature is not stored in the upper part of the hot water storage tank 17.

  When the connection between the boiling forward path 71 and the boiling return path 72 of the boiling circuit 70 is normal, the uppermost 1/5 position temperature detection sensor 18b detects the amount of remaining hot water. It is a time shorter than the time (about 1 hour) required to detect the hot water stored in the upper side, for example, after a predetermined time of about 15 minutes, the black display of the piping route in FIG. As shown, the circulatory circulation pump 47 of the remedy circuit 49 is operated, the hot water in the upper part of the hot water storage tank 17 is taken out through the upper take-out path 25, the regulating valve 28, the hot water supply path 29 (take-out path 31), The inside of the memory circuit 49 is circulated so as to return to the intermediate position in the vertical direction of the hot water tank 17 through the intake path 46.

  During circulation, the temperature of the hot water detected by the hot water supply temperature detection sensor 41 provided in the memory circuit 49 is monitored, and if the detected hot water temperature is equal to or higher than a predetermined boiling temperature, the boiling circuit 70 It is determined that the connection between the upward travel path 71 and the boiling return path 72 is normal.

  On the other hand, if the detected hot water temperature is lower than the predetermined boiling temperature and does not reach the predetermined boiling temperature even after the predetermined time has elapsed, the boiling forward path 71 of the boiling circuit 70 and the return for boiling are returned. It is determined that the path 72 is in a reverse connection state. When it is determined that the connection is reverse, for example, a notification is given by displaying a remote control.

  Thus, at the start of the boiling operation, the heating circulation pump 77 of the heat pump unit 75 and the boiling circuit 70 is operated, and after a predetermined time has elapsed from the start of the boiling operation, the circulation for the tracking circuit 49 When the pump 47 is operated and the temperature of the hot water detected by the hot water supply temperature detection sensor 41 of the tracking circuit 49 is lower than a predetermined boiling temperature, the boiling forward path 71 and the boiling return path 72 of the boiling circuit 70 Can be determined to be in the reverse connection state, so that the reverse connection can be determined in a shorter time than conventional.

  In particular, for a predetermined time from the start of the boiling operation for starting the operation of the circulation pump 47 for the tracking circuit 49, the connection between the boiling forward path 71 and the boiling return path 72 of the boiling circuit 70 is In a time shorter than the time (about 1 hour) required to detect hot water stored in the upper part of the hot water storage tank 17 by the temperature detection sensor 18b at the uppermost 1/5 position that detects the amount of hot water when it is normal Yes, reverse connection can be determined in a shorter time than conventional.

  Further, for detecting reverse connection, the existing remedy circuit 49 can be used due to the mechanism, and there is no addition of other components, and the cost increase can be suppressed. For example, in order to detect the direction in which hot water boiled up by the heat pump unit 75 flows, it is not necessary to add a temperature detection sensor to the boiling forward path 71 and the boiling return path 72.

  Note that this reverse connection detection may be performed only during a test operation after the hot water supply device 11 is installed, that is, only during the first boiling operation after the power is turned on.

  In addition, the heat load for exchanging heat with the hot water in the hot water storage tank 17 with the heat load heat exchanger of the heat load circuit is not limited to the reheating of the bathtub water in the bathtub 14, but is also applied to hot water heating such as floor heating. it can.

It is a block diagram in which the forward path for boiling and the return path for boiling are in a reverse connection state of the boiling circuit of the hot water supply apparatus showing an embodiment of the present invention. It is a block diagram which shows the boiling operation in case the same hot-water supply apparatus is connected normally. It is a block diagram which shows the chasing operation when the hot-water supply apparatus same as the above is normally connected.

Explanation of symbols

11 Water heater
17 Hot water storage tank
18b-18f Temperature detection sensor as means for detecting remaining hot water
31 Extraction route
41 Hot water temperature detection sensor as hot water temperature detection means
45 Heat exchanger for remembrance as heat exchanger for heat load
46 Intake route
47 Recirculation circulation pump as a heat load circulation pump
49 Remembrance circuit as thermal load circuit
70 Boiling circuit
71 Boiling route
72 Return path for boiling
75 Heat pump unit
77 Circulation pump for boiling
81 Control unit

Claims (2)

A hot water storage tank for storing hot water,
A heat pump unit for boiling the hot water;
A boiling forward path connecting the lower part of the hot water storage tank and the heat pump, a return path for boiling connecting the heat pump unit and the upper part of the hot water storage tank, and an outgoing path for boiling water in the lower part of the hot water storage tank A boiling circuit having a boiling circulation pump that circulates in a direction returning to the upper part of the hot water storage tank via the heat pump unit and the boiling return path,
An extraction path for extracting hot water from the upper part of the hot water storage tank, a heat exchanger for heat load for exchanging heat from the hot water extracted in the extraction path with the heat load side, and hot water passing through the heat exchanger for heat load An intake path for returning to the hot water storage tank, a hot load circulation pump for circulating the hot water from the hot water storage tank to the hot water storage tank through the heat load heat exchanger and the intake path, and a take-out path for the hot load. A heat load circuit having a hot water supply temperature detecting means for detecting the temperature of the hot water,
The heat pump unit and the boiling circulation pump of the boiling circuit are operated at the start of boiling operation, and the heat load circulation pump of the heat load circuit is operated after a predetermined time has elapsed from the start of boiling operation. A control unit that determines that the boiling path and the boiling return path of the boiling circuit are in a reverse connection state if the temperature of the hot water detected by the hot water temperature detection means of the load circuit is lower than a predetermined boiling temperature A hot water supply apparatus comprising: Provided with a plurality of remaining hot water amount detecting means provided at a plurality of height positions of the hot water storage tank and detecting the remaining hot water amount in the hot water storage tank;
The control unit starts the operation of the circulation pump for heat load of the heat load circuit for a predetermined time from the start of boiling operation, when the connection between the boiling forward path and the boiling return path is normal. The hot water supply apparatus according to claim 1, wherein the time is shorter than a time required for detecting the hot water stored in the upper side of the hot water storage tank by the uppermost remaining hot water amount detecting means.

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