JP2011122807A - Hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply device which prevents various problems occurring when opening of a hot water injection valve for automatically tapping hot water, is failed, by continuing supply of hot water to a bathtub, while suppressing an increase in component costs and a component mounting space. <P>SOLUTION: In this hot water supply device including a hot water supply control means 60 executing an operation in a hot water tapping mode by controlling a heating amount of a hot water supply heat exchanger 8 and an opening of a hot water supply pipe conduit 2 so that the temperature of hot water supplied from the hot water supply pipe conduit 2 is kept at a target hot water tapping temperature while opening the hot water injection valve 21, supplying the hot water of target hot water tapping amount to the bathtub 4, and closing the hot water injection valve 21 when the supply of hot water of the target hot water tapping amount is completed, and changing a mode from the hot water tapping mode to a hot water supply mode when the hot water tapping operation is completed, a valve opening failure coping means 62 is disposed to control a water servo 13 to a minimum opening, when a hot water tapping flow rate sensor 26 detects a flow rate more than a prescribed rate, when the hot water injection solenoid valve 21 is controlled to be closed due to the completion of the operation in the hot water tapping mode. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hot water supply device with an automatic hot water filling function for supplying a predetermined amount of hot water to a bathtub.

  In a conventional hot water supply device with an automatic hot water filling function, the hot water temperature for hot water supply mode (target hot water temperature) for supplying hot water to a caran or the like and the hot water temperature for hot water filling mode for supplying hot water to a bathtub (target hot water filling) The temperature is generally set individually (see, for example, Patent Documents 1 and 2).

  Then, when the hot water is filled in the hot water filling mode, the amount of hot water heated by the heat source (burner, etc.) is controlled so that the temperature of the hot water discharged into the bathtub becomes the target hot water filling temperature. The mode is shifted from the hot water supply mode. At the time of hot water supply in the hot water supply mode, the amount of hot water heated by the heat source is controlled so that the temperature of the hot water discharged to the currant or the like becomes the target hot water supply temperature when the currant is opened.

Japanese Patent Laid-Open No. 02-254253 JP 2004-309068 A

  Here, automatic hot water filling to the bathtub is started by opening a pouring valve provided in a hot water filling relay pipe connecting the hot water supply pipe of the hot water supply device and the bathtub, and supply of a predetermined amount of hot water is completed. When it is done, it ends by closing the pouring valve.

  However, the pouring valve is in an open failure state due to garbage biting on the moving part of the pouring valve or a defective drive circuit (the pouring valve cannot be closed and the hot water supply from the hot water supply device to the bathtub is stopped. When the automatic hot water filling is finished, the hot water supply to the bathtub is continued.

  When automatic hot water filling ends, as described above, the setting of the hot water temperature from the hot water supply apparatus to the hot water supply pipe is switched from the target hot water filling temperature to the target hot water supply temperature. For this reason, the temperature of the hot water supplied to the bathtub becomes the target hot water temperature after the automatic hot water filling is completed, but the target hot water temperature is set higher than the target hot water temperature corresponding to the use of hot water in the mixer tap. In many cases, the temperature of the hot water stretched on the bathtub becomes higher than the target hot water temperature due to the continued supply of hot water.

  As a result, when the bather is immersed in the bathtub, there is an inconvenience that the hot water is uncomfortable. Moreover, hot water overflows from the bathtub due to continued supply of hot water to the bathtub, so that the hot water is wasted and wasteful energy is consumed in the heating source.

  Therefore, in order to prevent such inconvenience, it is conceivable to provide a separate on-off valve in preparation for a valve opening failure of the pouring valve, but in this case, the parts cost of the hot water supply device is reduced. Along with the increase, it is necessary to newly secure a space for providing a spare on-off valve.

  The present invention has been made in view of the above-described background, and a hot water supply apparatus that suppresses various inconveniences caused by continuation of hot water supply to a bathtub when a valve opening failure of a pouring valve for automatic hot water filling occurs. It is an object of the present invention to suppress the increase in component cost and component mounting space.

  The present invention has been made to achieve the above object, and adjusts the opening degree of a hot water supply pipe for heating water supplied from one end and supplying hot water from the other end, and the hot water supply pipe. An opening control valve, a hot water heat exchanger that heats water flowing through the hot water supply pipe, a hot water pipe that communicates the hot water pipe with the bathtub, and hot water that detects the flow rate of hot water flowing through the hot water pipe The tension flow rate sensor, a pouring valve that opens and closes the hot water filling pipe, and the hot pouring valve is closed so that the temperature of hot water discharged from the hot water supply pipe becomes the target hot water temperature. The temperature of the hot water discharged from the hot water supply line is determined from the operation in the hot water supply mode for controlling the heating amount of the hot water heat exchanger and the opening of the hot water supply line, and the state where the pouring valve is opened. Control the heating amount of the hot water supply heat exchanger and the opening of the hot water supply pipe so that the tension temperature is reached, The tank is supplied with a target amount of hot water, and when the supply of the target amount of hot water is completed, the hot water filling mode is performed to close the pouring valve. The present invention relates to a hot water supply device including hot water supply control means for shifting from a hot water filling mode to a hot water supply mode when the operation is finished.

  When the hot water supply control means performs the valve closing control of the pouring valve due to the end of the operation in the hot water filling mode, a flow rate of a predetermined amount or more is detected by the hot water filling amount sensor. In this case, a valve opening failure countermeasure means for controlling the opening degree adjusting valve to a minimum opening degree is provided.

  According to the present invention, when the hot water supply control means performs the valve closing control of the pouring valve, when the flow rate of the predetermined amount or more is detected by the hot water amount sensor, It can be determined that the pouring valve is in a state in which it has failed to open (the state in which the pouring valve cannot be closed).

  Therefore, in this case, the target hot water supply when the operation in the hot water filling mode is completed and the hot water supply mode is shifted to the minimum by opening the opening control valve by the valve opening failure countermeasure means. The supply of hot water at a temperature to the bathtub can be stopped, or the supply flow rate of hot water at the target hot water supply temperature to the bathtub can be reduced. And thereby, it can suppress that the temperature of the hot water in a bathtub deviates from the said target hot water filling temperature, and that hot water overflows from a bathtub. The opening degree adjusting valve is used for temperature control of hot water discharged from the hot water supply pipe by the hot water supply control means, and needs to be newly provided for processing by the valve opening failure countermeasure means. Therefore, there is no increase in component cost and component mounting space.

  Further, when the target hot water supply temperature is equal to or higher than a predetermined temperature, the valve opening failure countermeasure means starts the control to make the opening degree adjusting valve to the minimum opening degree, and then the opening degree adjusting valve becomes the minimum opening degree. Until the target hot water supply temperature is set to be equal to or lower than the predetermined temperature.

  According to the present invention, hot water exceeding the predetermined temperature is supplied to the bathtub until the opening control valve reaches the minimum opening, and the temperature of the hot water in the bathtub is the target hot water temperature. Can be prevented.

  And a burner for heating the heat exchanger, and a burner abnormality coping means for prohibiting combustion of the burner and maintaining the flow control valve in an open state when a combustion abnormality of the burner is detected. It is characterized by that.

  According to the present invention, when the combustion abnormality of the burner is detected and combustion of the burner is prohibited, the user is connected to the hot water supply line by maintaining the flow rate adjusting valve in an open state. You can open the tank and make it possible to use water.

The whole hot-water supply apparatus block diagram of this invention. The control block diagram of the hot-water supply apparatus shown in FIG. The flowchart of the valve opening failure detection of a pouring solenoid valve, and the corresponding process of a valve opening failure.

  An example of an embodiment of the present invention will be described with reference to FIGS. With reference to FIG. 1, the hot water supply apparatus of the present embodiment is connected to a water supply (not shown) by a hot water supply pipe 2 and connected to a bathtub 4 by a reheating pipe 3. Then, the hot water supply device 1 heats the water supplied from the water supply to the hot water supply pipe 2 to the target hot water supply temperature and supplies the hot water stored in the bathtub 4 to the hot water supply mode supplied to a curan (not shown). And a function of performing hot water filling for storing a predetermined amount of hot water at a target hot water temperature in the bathtub 4.

  The overall operation of the hot water supply apparatus 1 is controlled by the controller 5, and the hot water supply first burner 6 and the hot water supply second burner 7, the hot water supply first burner 6 and the hot water supply second are operated according to the control signal output from the controller 5. Hot water supply heat exchanger 8 heated by the burner 7, a reheating burner 9 that operates according to a control signal output from the controller 5, a reheating heat exchanger 10 that is heated by the reheating burner 9, and a hot water supply pipe 2, the bypass pipe 11 that bypasses the hot water supply heat exchanger 8 and mixes it with hot water discharged from the hot water heat exchanger 8, and the opening degree of the bypass pipe 11 is controlled by a control signal from the controller 5. A bypass servo 12 for adjusting, a water amount servo 13 for adjusting the opening of the hot water supply pipe 2 by a control signal from the controller 5 (corresponding to the opening control valve of the present invention), a hot water supply pipe 2 and a bar A hot water thermistor 14 that detects the temperature of hot water downstream of the junction with the path pipe 11 and outputs a detection signal to the controller 5, detects the temperature of hot water near the outlet of the hot water heat exchanger 8, and controls the detection signal 5 and a hot water supply thermistor 15 that outputs to the controller 5 by detecting the flow rate of the water supplied to the hot water supply pipe 2 from the water supply.

  Furthermore, the hot water supply apparatus 1 includes a hot water filling relay pipe 20 that connects the hot water supply pipe 2 and the tracking pipe 3, and a hot water solenoid valve 21 that is operated by a control signal from the controller 5 to open and close the hot water filling relay pipe 20. (Corresponding to the pouring valve of the present invention), the passage of hot water in the direction from the pouring relay pipe 3 to the hot water relay pipe 20 is made impossible, and the hot water in the direction from the hot water pouring relay pipe 20 to the hot water pipe 3 is prevented. A check valve 22 that allows passage of water, a pump 23 that operates in response to a control signal from the controller 5 and circulates hot water stored in the bathtub 4 in the tracking pipe 3, and hot water flowing in the tracking pipe 3 A bath thermistor 24 that detects the temperature and outputs a detection signal to the controller 5, a bath water flow switch 25 that detects the presence or absence of hot water flowing in the tracking pipe 3 and outputs a detection signal to the controller 5, and a hot water supply pipe 2 Hot water filling relay pipe 20 and memorial pipeline And a hot water filling flow sensor 26 that outputs a detection signal by detecting the flow rate of the hot water supplied to the bathtub 4 to the controller 5 via the and.

  The hot water supply pipe line 2 is connected to a hot water supply pipe 45 downstream of a branch point with the hot water filled relay pipe 20. Further, the hot water flow path from the hot water supply pipe 2 to the bathtub 4 via the hot water filling relay pipe 20 and the tracking pipe 3 corresponds to the hot water filling pipe of the present invention.

  In addition, the hot water supply device 1 includes an original gas solenoid valve 30 that switches between supply and shutoff of fuel gas to the first hot water supply burner 6, the second hot water supply burner 7, and the reheating burner 9 in accordance with a control signal from the controller 5. A gas proportional valve 31 that adjusts the supply flow rate of the fuel gas in response to a control signal from 5, and a hot water supply first gas that switches between supply and shutoff of fuel gas to the hot water supply first burner 6 in response to a control signal from the controller 5 Solenoid burner 9 according to the control signal from hot water supply 2nd gas electromagnetic valve 33 and controller 5 which switches supply and interruption of fuel gas to hot water supply 2nd burner 7 according to the control signal from solenoid valve 32 and controller 5 The reheating gas solenoid valve 34 for switching between supply and shutoff of the fuel gas to the fuel, the hot water supply first burner 6, the hot water supply second burner 7 and the reheating burner 9 in accordance with the control signal from the controller 5 The combustion fan 35 for supplying the working air, the hot water supply spark plug 37 and the reheating spark plug 38, the hot water supply first burner 6 and the hot water supply first that generate a spark discharge by the high voltage applied from the igniter 36 according to the control signal from the controller 5 A hot water supply frame rod 39 that detects the presence or absence of a combustion flame in the two burner 7 and outputs a detection signal to the controller 5, and a reheating frame that detects the presence or absence of a combustion flame in the additional burner 9 and outputs a detection signal to the controller 5. A rod 40 is provided.

  The hot water supply apparatus 1 detects abnormal overheating of the hot water supply heat exchanger 8 and outputs a detection signal to the controller 5, and detects abnormal overheating of the reheating heat exchanger 10 and outputs a detection signal. A reheating high limit sensor 43 that outputs to the controller 5 is provided. The controller 5 turns the hot water supply first burner 6 and the hot water supply second burner 7 when the hot water supply high limit sensor 42 detects abnormal overheating of the hot water supply heat exchanger 8. The fire is extinguished, and when the overheating high limit sensor 43 detects abnormal overheating of the hot water supply heat exchanger 8, the overheating burner 9 is extinguished.

  The controller 5 transmits and receives various signals to and from the remote controller 50 installed in a bathroom or the like. The remote controller 50 includes switches (not shown) for setting a hot water supply temperature, a hot water filling temperature, a chasing time, and the like, and a display unit (not shown) for displaying the hot water supply temperature, the hot water filling temperature, and the like.

  Next, referring to FIG. 2, the controller 5 is an electronic unit composed of a microcomputer or the like, and by causing the microcomputer to execute a control program for the hot water supply device 1 held in the memory 64, It functions as a control means 60, a tracking control means 61, a valve opening failure countermeasure means 62, and a burner abnormality countermeasure means 63.

  The hot water supply control means 60 operates in a hot water supply mode (hot water supply operation) in which hot water at a target hot water supply temperature (hot water temperature set by the remote controller 50) is supplied from the hot water supply pipe 2, and from the hot water supply pipe 2 to the hot water filled relay pipe 20. Then, the hot water at the target hot water temperature (the hot water temperature set by the remote controller 50) is supplied to the bathtub 4 by the target hot water amount (the hot water amount set by the remote controller 50). The operation in the hot water filling mode (hot water filling operation) is executed. The chasing control means 61 executes chasing operation for raising the temperature of hot water stored in the bathtub 4 to a target chasing temperature.

  The valve opening failure countermeasure means 62 performs processing to cope with a valve opening failure of the pouring electromagnetic valve 21. The burner abnormality coping means 63 performs processing for coping with the combustion abnormality of the burners 6, 7, 9 when it is detected.

  In the hot water supply mode, the hot water supply control means 60 detects from the detection signal of the water amount sensor 16 that a curan or the like (not shown) connected to the downstream side of the hot water supply pipe 2 is opened and water supply from the water pipe is started. When detected, the hot water supply first burner 6 and the hot water supply second burner 7 are ignited by the hot water supply ignition plug 37 connected to the igniter 36, and the hot water supply operation is started. In the hot water supply operation, the hot water supply control means 60 is configured so that the hot water at the target hot water supply temperature is supplied from the hot water supply pipe line 2, the combustion fan 35, the hot water supply first gas solenoid valve 32, the hot water supply second gas solenoid valve 33, and the gas proportional valve. 12 controls the amount of combustion of the hot water supply first burner 6 and the hot water supply second burner 7, and even if the hot water supply first burner 6 and the hot water supply second burner 7 are burned at maximum capacity, the amount of water is not supplied. The opening degree of the servo 13 is decreased to reduce the incoming water flow rate to the hot water supply pipe 2.

  Further, the hot water supply control means 60 starts the hot water filling operation by opening the hot water solenoid valve 21 in the hot water filling mode. As with the hot water supply operation described above, the hot water supply control means 60 supplies hot water so that hot water having a target hot water filling temperature is supplied from the hot water supply pipe 2 to the bathtub 4 via the hot water filling relay pipe 20 and the additional heating pipe 3. The combustion amount of the first burner 6 and the hot water supply second burner 7 and the opening degree of the water amount servo 13 are controlled.

  The hot water filling control means 62 accumulates the flow rate of hot water supplied to the bathtub 4 detected by the hot water sensor 26 and closes the pouring solenoid valve 21 when the accumulated hot water amount reaches the target hot water filling amount. End the filling operation.

  When the user operates the remote controller 50 to instruct “chase”, the chase control means 61 ignites the chase burner 9 and starts a chase operation. The reheating control means 61 stores the water in the bathtub 4 by operating the pump 23 in a state where the hot water supply reheating burner 9 is burned and circulating the hot water stored in the bathtub 4 in the reheating pipe 3. The hot and cold water thus heated is raised to the target pursuit temperature set by the remote controller 50.

  When the temperature of the hot water stored in the bathtub 4 detected by the bath thermistor 24 reaches the target reheating temperature set by the remote controller 50, the reheating control means 61 revolves with the original gas solenoid valve 30. The gas solenoid valve 34 is closed to extinguish the reheating burner 9, the operation of the combustion fan 35 and the pump 23 is stopped, and the renewal operation is ended.

  Next, processing by the valve opening failure countermeasure means 62 will be described according to the flowchart shown in FIG.

  The valve opening failure countermeasure means 62 determines whether or not the hot water filling operation is finished and the hot water filling control means 60 performs the valve closing control of the hot water solenoid valve 21 in STEP1 of FIG. Then, when the valve closing control of the pouring electromagnetic valve 21 is performed, the process proceeds to STEP 2 and the valve opening failure countermeasure means 62 detects the flow rate detected by the hot water flow rate sensor 26 at 2.7 liters / minute (to the predetermined amount of the present invention). If it is equal to or more, proceed to STEP3.

  On the other hand, when the flow rate detected by the hot water filling flow sensor 26 is less than 2.7 liters / minute, it can be determined that the pouring electromagnetic valve 21 is operating normally and is fully closed. 62 ends the process. In this case, the process for the valve opening failure of the pouring solenoid valve 21 is not performed.

  Here, a certain amount of time is required until the pouring electromagnetic valve 21 is actually closed after the valve closing control of the pouring electromagnetic valve 21 is started. And supply of hot water from the hot water supply device 1 to the bathtub 4 is continued until the pouring solenoid valve 21 is closed, but since the hot water filling operation is completed, the hot water filling mode is shifted to the hot water supply mode. The hot water supply control means 60 controls the temperature of the hot water supplied to the hot water supply pipe line 2 so as to reach the target hot water supply temperature.

  Therefore, when the target hot water supply temperature is set high, hot water is supplied to the bathtub 4 and the temperature of the hot water in the bathtub 4 becomes higher than the target hot water temperature. Therefore, the valve opening failure countermeasure means 62 determines whether or not the hot water supply set temperature is 45 ° C. (corresponding to the predetermined temperature of the present invention) or higher in STEP 3, and if the hot water set temperature is 45 ° C. or higher, STEP 10 The hot water supply set temperature is 45 ° C.

  Then, in the subsequent STEP 4, the state in which the flow rate of 2.7 liters / min or more is detected by the hot water flow rate sensor 26 starts the valve closing control of the hot water solenoid valve 21, and the hot water solenoid valve 21 is actually The process proceeds to STEP 5 when it continues for a certain time (for example, 45 seconds) set longer than the time required for the valve closing state to be reliably detected that the pouring electromagnetic valve 21 is in the valve opening failure state.

  In STEP 5, the valve opening failure countermeasure means 62 displays on the display unit of the remote controller 50 to notify the valve opening failure of the pouring electromagnetic valve 21, and in STEP 6, the water amount servo 13 is fully closed. By fully closing the water amount servo 13, the supply of hot water from the hot water supply device 1 to the bathtub is stopped, so that the temperature of the hot water in the bathtub 4 rises due to the supply of hot water to the bathtub, and from the bathtub 4 The overflow of hot water can be avoided. Then, the process proceeds to STEP 7 and the valve opening failure countermeasure unit 62 ends the process.

  It should be noted that the display for notifying the valve opening failure of the hot water solenoid valve 21 is operated by operating a not-shown operation switch (switch for switching the hot water supply device 1 between an operating state and a standby state) of the remote controller 50. Although the light is turned off when the standby state is entered, the water amount servo 13 is maintained in the fully closed state even in the standby state, and the water amount servo 13 is fully closed when the water heater 1 is returned to the operating state by operating the operation switch. May be continuously displayed by the valve opening failure countermeasure means 62 to notify the valve opening failure of the pouring electromagnetic valve 21 again. When the hot water supply device 1 is turned off and then on again, the countermeasure for the valve opening failure of the hot water solenoid valve 21 is reset, the water amount servo 13 is opened, and the hot water solenoid valve 21 is turned on. You may make it complete | finish the display which alert | reports a valve opening failure.

  Next, the burner abnormality coping means 63 monitors the combustion state of the hot water supply first burner 6 and the hot water supply second burner 7 based on the detection signal of the hot water supply frame rod 39, and the reheating burner 9 based on the detection signal of the reheating frame rod 40. Monitor the combustion state of When the burner abnormality coping means 63 detects an abnormality (misfire, etc.) in any one of the hot water supply first burner 6, hot water supply second burner 7, and reheating burner 9, the original gas solenoid valve 30 Is closed and combustion of these burners is prohibited, and a display for notifying the abnormality of the burner combustion state is displayed on the display unit of the remote controller 50.

  Here, the burner abnormality handling means 63 differs from the processing by the valve opening trouble handling means 62 when the opening failure of the pouring electromagnetic valve 21 is detected when the abnormality of the burner is detected in this way. The process of fully closing the servo 13 is not performed, and the opening of the water quantity servo 13 is kept at the current opening. Therefore, the user cannot use the hot water, but can use the water by opening the currant or the like connected to the hot water supply pipe 2.

  In the present embodiment, the hot water supply device 1 including the hot water supply heat exchanger 8 and the reheating heat exchanger 10 heated by the gas burner is shown, but a burner using other fuel such as oil may be used. Good.

  Moreover, in this Embodiment, the water quantity servo 13 which can be fully closed as an opening degree adjustment valve of this invention is shown, and the valve opening failure countermeasure means 62 is when a valve opening failure of the pouring electromagnetic valve 21 occurs. When the water amount servo 13 is fully closed, but the opening degree adjusting valve cannot be fully closed, the effect of the present invention can be obtained by setting the opening degree adjusting valve to the minimum opening degree.

  DESCRIPTION OF SYMBOLS 1 ... Hot-water supply apparatus, 2 ... Hot-water supply pipe line, 3 ... Reheating pipe line, 4 ... Bathtub, 5 ... Controller, 6 ... Hot-water supply 1st burner, 7 ... Hot-water supply 2nd burner, 8 ... Hot-water supply heat exchanger, 9 ... Additional Burning burner, 10 ... reheating heat exchanger, 11 ... bypass pipe, 12 ... bypass servo, 13 ... water quantity servo, 14 ... hot water supply thermistor, 15 ... heat exchange thermistor, 16 ... hot water supply flow rate sensor, 20 ... hot water filled relay pipe, DESCRIPTION OF SYMBOLS 21 ... Pouring solenoid valve, 26 ... Hot water flow rate sensor, 60 ... Hot water supply control means, 61 ... Reheating control means, 62 ... Valve opening failure countermeasure means, 63 ... Burner abnormality countermeasure means

Claims (3)

A hot water supply line for heating water supplied from one end and supplying hot water from the other end;
An opening adjustment valve for adjusting the opening of the hot water supply pipe;
A hot water supply heat exchanger for heating the water flowing through the hot water supply line;
A hot-water pipe connecting the hot-water supply line and the bathtub;
A hot water flow sensor for detecting the flow rate of hot water flowing through the hot water pipe,
A pouring valve for opening and closing the hot water filling pipe,
With the pouring valve closed, the heating amount of the hot water heat exchanger and the opening degree of the hot water supply line are controlled so that the temperature of hot water discharged from the hot water supply line becomes the target hot water supply temperature. The amount of heating of the hot water supply heat exchanger and the temperature so that the temperature of the hot water discharged from the hot water supply line becomes the target hot water filling temperature from the operation in the hot water supply mode and the state where the pouring valve is opened. In a hot water filling mode in which the opening degree of the hot water supply pipe is controlled to supply hot water of a target hot water amount to the bathtub and when the supply of hot water of the target hot water amount is completed, the pouring valve is closed. In the hot water supply apparatus provided with hot water supply control means for shifting from the hot water filling mode to the hot water supply mode when the operation in the hot water filling mode is completed.
When the operation of the hot water filling mode is completed and the hot water supply control means performs the valve closing control of the pouring valve, a flow rate of a predetermined amount or more is detected by the hot water filling water amount sensor. In some cases, a hot water supply apparatus comprising valve opening failure countermeasure means for controlling the opening degree adjusting valve to a minimum opening degree. The hot water supply device according to claim 1,
When the target hot water supply temperature is equal to or higher than a predetermined temperature, the valve opening failure countermeasure means starts control for setting the opening degree adjustment valve to the minimum opening degree until the opening degree adjustment valve reaches the minimum opening degree. Meanwhile, the target hot water supply temperature is set to be equal to or lower than the predetermined temperature. In the hot water supply device according to claim 1 or 2,
A burner for heating the heat exchanger;
A hot water supply apparatus comprising burner abnormality coping means for prohibiting combustion of the burner and maintaining the flow rate regulating valve in an open state when an abnormality in combustion of the burner is detected.

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