JPH1122970A - Hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water heater including control means which detects whether a solenoid valve of a gas supply passage is completely closed or not, and informs a user of a malfunction of the solenoid valve when the solenoid valve cannot be closed completely. SOLUTION: When the operation of a hot water supply device 1 is started after setting a water mode from a stop condition, an igniter 5 and a flame rod 6 are operated while holding a solenoid valve 24 in a closed condition. When the operation of the hot water supply device 1 is switched from the hot water mode to the cold water mode, the solenoid valve 24 is closed and the flame rod 6 is operated. In respective cases, when the flame rod 6 detects the flame of a burner 2, a controller 4 operates a buzzer 9 and a lamp 10, closes a water stop valve 14 and informs a user of a condition that the solenoid valve 24 is not completely closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply apparatus, and more particularly, to a hot water supply apparatus having control means for notifying a user of a failure of a solenoid valve for controlling combustion of a combustion apparatus.

[0002]

2. Description of the Related Art Conventionally, a water path formed by connecting a water supply path, a heat exchanger, and a tapping path, a water flow detecting means and a hydraulic passive unit provided in the water path, and heating the heat exchanger. A burner, a gas supply passage to the burner, a solenoid valve provided in the gas supply passage, a hydraulic valve operated to be opened and closed by the hydraulic passive unit, ignition means for igniting the burner, and the burner A hot water supply device having a flame detection means for detecting the presence or absence of flame of the water, and a hot water supply switch for switching between a hot water mode for permitting combustion of the burner and a water mode for inhibiting combustion of the burner, a so-called small instantaneous water heater. Are known.

When the water heater is started to be used in a hot water mode from a stopped state, water flows in a water path and a water pressure responsive valve is opened.
At the same time, the solenoid valve is opened and gas is supplied to the burner, the gas is ignited by the ignition means, and the temperature of the water is increased through the heat exchanger heated by the burner in the combustion state, so that the user can obtain hot water. .

[0004] When the water heater is started to be used in the water mode from the stopped state, water flows in the water path and the water pressure responsive valve opens, but the solenoid valve remains closed, and gas does not flow to the burner and the water is heated. Because there is no user can get water.

When the hot water supply device is used by switching from the water mode to the hot water mode, the solenoid valve closed in the water mode is opened to supply gas to the burner, and the gas is ignited by the ignition means and heated by the burner in the combustion state. The temperature of the water is raised through the heat exchanger, and the user can obtain hot water.

When the hot water supply device is used by switching from the hot water mode to the water mode, the solenoid valve opened in the hot water mode is closed to shut off the gas supplied to the burner, so that the gas does not flow to the burner and the water is heated. Because there is no user can get water.

In such a hot water supply device, it is conceivable that the solenoid valve may not be completely closed due to dust or the like.

When the water heater is started to be used in the water mode from a stopped state while the solenoid valve is not completely closed, water flows in the water path, the water pressure responsive valve opens, and gas flows to the burner.
At this time, there is an inconvenience that the user does not notice the flow of the gas because the ignition means does not operate and the gas remains unignited, and therefore does not notice that the solenoid valve does not close completely.

If the hot water supply device is switched from the hot water mode to the water mode while the solenoid valve is not completely closed, the gas supplied to the burner in the hot water mode is not completely shut off even after the water mode is switched. The heat exchanger continues to be heated by the burner. At this time, the user does not easily notice that the hot water supply device is defective even if the heated hot water continues to be supplied from the hot water supply path because the hot water mode has been used in spite of the water mode. In addition, when the water mode is switched to the water mode and the heated water continues to be supplied from the hot water supply path after a long time elapses, it is visually noticed that the hot water supply device is defective, but it is noticed that the defectiveness is due to the solenoid valve not being completely closed. There is a disadvantage that there is no.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned disadvantages, the present invention detects whether or not a solenoid valve of a gas supply path is completely closed. An object of the present invention is to provide a hot water supply device having a control means for notifying a user of a failure of a solenoid valve.

[0011]

According to a first aspect of the present invention, there is provided a hot water supply apparatus for notifying a user of a failure of an electromagnetic valve to a hot water supply apparatus, and stopping the hot water supply apparatus. When the water mode is set from the state and the operation is started, a water flow detection signal is received from the water flow detection means to activate the ignition means and the flame detection means, and the notification means is received by receiving the flame detection signal from the flame detection means. And control means for operating.

According to a second aspect of the present invention, there is provided a hot water supply apparatus provided in a water path of the hot water supply apparatus for stopping water supply to the water path. When the water mode is set and the operation is started, a water flow detection signal from the water flow detection means is received to operate the ignition means and the flame detection means, and the water stop valve is received by receiving the flame detection signal from the flame detection means. And control means for closing the valve.

In the above embodiment, when the operation is started in the water mode from the stopped state, water flows in the water path, the water pressure responsive valve is opened, and the water flow detecting means detects the water flow. Upon receiving the water flow detection signal, the control means operates the ignition means and the flame detection means. If the solenoid valve is not completely closed, gas leaks to the burner, and the leaked gas is ignited by the ignition means to generate a flame, and the flame detection means detects the flame. In response to the flame detection signal, the control means activates the notification means or closes the water stop valve to stop the water flow, so that the user cannot operate the notification means or stop the water flow to completely close the solenoid valve. Notice the situation. Further, when the water shutoff valve is closed, the pressure on the hydraulic pressure passive section is lost due to the stoppage of the water flow, the hydraulic pressure responsive valve is closed, and the gas flow into the burner is shut off.

According to a third aspect of the present invention, there is provided a hot water supply apparatus for notifying a user of a malfunction of an electromagnetic valve to the hot water supply apparatus, and switching the hot water supply apparatus from a hot water mode to a water mode. Control means for activating the flame detecting means when used in use and receiving a flame detection signal from the flame detecting means to activate the notifying means.

According to a fourth aspect of the present invention, there is provided a hot water supply apparatus having a water stop valve provided in a water path of the hot water supply apparatus for stopping water supply to the water path. Control means for activating the flame detecting means when used by being switched to the water mode and receiving the flame detection signal from the flame detecting means to close the water stop valve.

When the mode is switched from the hot water mode to the water mode in the above embodiment, the control means activates the flame detecting means. If the solenoid valve is not completely closed, gas flows through the burner in spite of the water mode, so that a flame remains in the burner, and the flame is detected by the flame detecting means. In response to the flame detection signal, the control means activates the notification means or closes the water stop valve to stop the water flow, so that the user does not completely close the electromagnetic valve due to the operation of the notification means or the stop of the water flow. I notice that. When the water shutoff valve is closed, the water flow pressure to the hydraulic passive section is lost due to the stoppage of the water flow, and the water pressure responsive valve is closed to shut off the gas flow into the burner.

When the flame detecting means is always in the operating state, that is, in the energized state when it is used in the water mode, a large amount of electric power is required. Particularly, when a battery is used as a power source, the life of the battery is shortened. . Therefore, in the water heater of the first and third aspects of the present invention, when the control means operates the ignition means for a predetermined time and the flame detection means for a time equivalent to the predetermined time, the energization time of the flame detection means is reduced. It is shorter and can save power consumption. The time equivalent to the predetermined time means a time equal to or slightly longer than the predetermined time. In the hot water supply apparatus according to the second and fourth aspects of the present invention, when the control means operates the flame detection means for a predetermined time after switching from the hot water mode to the water mode, the energization time of the flame detection means is shortened and power consumption is reduced. We can save quantity.

[0018]

1 to 4 show an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is a structural explanatory view of the hot water supply device in the present embodiment, FIG. 2 is a block diagram showing a control device of the hot water supply device, FIG. 3 is a flowchart showing a main routine of operation of the hot water supply device, and FIG. It is a flowchart which shows the subroutine of operation | movement of a water heater.

In the hot water supply apparatus of the present embodiment shown in FIG.
1 is a water path through which water or hot water flows, 2 is a burner for raising the temperature of water passing through the water path 1, 3 is a gas supply path for supplying fuel gas to the burner 2, 4 is a control device for controlling the operation of the hot water supply device It is. Reference numeral 5 denotes an igniter as ignition means for igniting the burner 2 via a discharge electrode, 6 denotes a frame rod as flame detection means for detecting a combustion flame of the burner 2, and 7 denotes a thermoelectric as a combustion state detection means of the burner 2. On the other hand, 8 is an operation switch that is pressed when the operation is started and stopped, and 9 and 10 are a buzzer and a lamp as notification means for notifying a user of a malfunction of the solenoid valve.

The water path 1 includes a water supply path 11, a heat exchanger 1
2. The tapping path 13 is connected. The water supply path 11 is provided with a water stop valve 14, a water pressure passive unit 15, a water flow control valve 16, and a water flow detection device 17 as water flow detection means. The water stop valve 14 is opened and closed by the control device 4 for supplying water to the water path 1 or stopping water. The hydraulic passive unit 15 is driven according to the water flow pressure of the water path 1. The water amount control valve 16 controls the degree of opening of the water supply path 11 by operating the temperature control knob 18 to change the water amount. The water flow detection device 17 detects the presence or absence of a water flow in the water path 1. Note that the water flow detection device 17 has a water flow switch 19, and the water flow switch 19 is turned on when the hydraulic pressure passive unit 15 is activated, and is turned off when it is not activated. The heat exchanger 12 is provided above the burner 2 with the fins 20, and raises the temperature of water passing therethrough by combustion heat of the burner 2. The hot water supply path 13 is formed of a flexible pipe, and discharges hot water or water through a shower head 21. Reference numeral 22 denotes a changeover switch for switching the form of hot water or water discharged from the shower head 21 between a shower shape and a straight shape. Reference numeral 23 denotes a hot water switch that switches between a hot water mode in which burner 2 combustion is permitted and a water mode in which combustion is prohibited.

The gas supply path 3 includes an electromagnetic valve 24, a water pressure responsive valve 25, a gas governor valve 26, and a gas amount control valve 27. The solenoid valve 24 is opened and closed by the control device 4 to supply or stop supplying gas to the gas supply path. The hydraulic responsive valve 25 is formed integrally with the hydraulic passive unit 15, and opens when the hydraulic passive unit 15 is driven by the water flow pressure. The gas governor valve 26 is for keeping the gas pressure constant. The gas amount control valve 27 is connected to the temperature control knob 18 and controls the degree of opening of the gas supply path 3 by operating the temperature control knob 18 to adjust the gas amount. The amount of water decreases and the amount of gas increases as the temperature control knob 18 is operated to the higher temperature side. Reference numeral 28 denotes a battery as a power source for driving the control device 4, the water stop valve 14, the electromagnetic valve 24, and the like.

As shown in FIG. 2, the control device 4 comprises a microcomputer 29, a water stop valve drive circuit 30 for opening and closing the water stop valve 14, and an electromagnetic valve drive circuit 3 for opening and closing the electromagnetic valve 24.
1, an igniter circuit 32 for operating the igniter 5, a frame rod circuit 33 for operating the frame rod 6,
Amplifying circuit 34 for amplifying electromotive force of thermocouple 7, buzzer 9
And a notification means circuit 35 for operating the lamp 10.

As shown in FIG.
Includes an operation control unit 36, a water control unit 37, and a combustion control unit 38.

The operation control unit 36 turns on the operation switch 8
An instruction is given to the water control unit 37 to determine whether the water stop valve 14 is opened or closed based on the determination of / OFF. Further, ON / OFF of the water flow switch 19 and ON (water mode) / OFF (hot water mode) of the hot / cold selector switch 23 are determined, and the operation of the igniter 5, the frame rod 6, the buzzer 9, the lamp 10, the solenoid valve 24, and the like is performed. An instruction is given to the combustion control unit 38 to perform control.

The water control unit 37 supplies electricity to the water stop valve drive circuit 30 to open the water stop valve 14 when the operation switch 8 is ON according to an instruction from the operation control unit 36, and to open the water stop valve 14 when OFF. The energization to 30 is stopped and the water stop valve 14 is closed. Further, as described later, the power supply to the water stop valve drive circuit 30 is stopped according to an instruction of the combustion control unit 38 that determines that the electromagnetic valve 24 is not completely closed, and the water stop valve 14 is closed.

The combustion control unit 38 includes the flame rod circuit 3
A flame detector 39 for detecting the presence or absence of a flame based on the output of 3
And a combustion state detector 40 for detecting the combustion state of the burner 2 from the electromotive force of the thermocouple 7 based on the output of the amplifier circuit 34.
And a timer 41 for measuring an elapsed time from the start of the operation of the igniter 5 or the frame rod 6.

When the hot water supply device is used in the hot water mode, that is, when the burner 2 is to be in a combustion state, the flame detection unit 3
9, the combustion control unit 38 energizes the solenoid valve drive circuit 31 to turn on the electromagnetic valve. The valve 24 is closed, and the gas supply to the burner 2 is stopped. Further, even when the burner 2 is burning normally, if a predetermined time (a time to forget to turn off) elapses from the start of the operation of the igniter 5, it is determined that the igniter 5 has been forgotten to turn off, and the electromagnetic valve driving circuit 31 is immediately sent to Stop energization and set solenoid valve 24
Is closed, the gas supply to the burner 2 is stopped, and the combustion is stopped.

When the water heater is started to be used in the water mode,
The water flow switch 19 is ON, and the hot water switch 23 is O
Upon receiving an instruction from the operation control unit 36 that has been determined to be N, the combustion control unit 38 energizes the igniter circuit 32 and the frame rod circuit 33 to start the igniter 5 and the frame rod 6 simultaneously. After a lapse of a predetermined time from the start of the operation, the power supply to the igniter circuit 32 is stopped to stop the operation of the igniter 5, and after a lapse of a time slightly longer than the predetermined time, the power supply to the frame rod circuit 33 is stopped and the flame rod 6 is turned off. Is terminated. If flame is detected in spite of the water mode in which combustion is prohibited, the solenoid valve 24
Is not completely closed, the power is supplied to the notification means circuit 35, the buzzer 9 and the lamp 10 are operated, and an instruction is given to the water control unit 37 to close the water stop valve 14.

If the hot water supply device is switched to the water mode while the water heater is being used in the hot water mode and is continuously used, the water flow switch 19 is turned on and the water / water switch 23 is turned off to O.
In response to an instruction from the operation control unit 36 that has been determined to have been switched to N, the combustion control unit 38 stops energization of the solenoid valve drive circuit 31 to close the solenoid valve 24, and the flame rod circuit 3
3 to start the operation of the frame rod 6, and after a predetermined time from the start of the operation, the energization to the frame rod circuit 33 is stopped to end the operation of the frame rod 6. If flame is detected in spite of the water mode in which combustion is prohibited, it is determined that the electromagnetic valve 24 is not completely closed, and the buzzer 9 and the lamp 10 are activated by energizing the notification means circuit 35, and the water stop valve An instruction is given to the water control unit 37 to close the valve 14.

Next, the operation of the water heater will be described with reference to the flowcharts shown in FIGS.

First, the main routine of the operation of the water heater will be described with reference to FIG.

When the operation switch is turned on (STEP
1) The water control unit 37 opens the water stop valve 14 according to an instruction from the operation control unit 36 (STEP 2). The operation control unit 36 turns on / off the water flow switch 19 based on the presence or absence of the water flow in the water path 1.
The FF is determined (STEP 3), and the ON / OFF of the hot water switch 23 is determined (STEP 4). When the hot water switch 23 is ON (water mode), the process proceeds to a first subroutine described later.
Proceed to TEP5.

The combustion control unit 38 which has received the instruction from the operation control unit 36 operates the igniter 5 and the frame rod 6,
The solenoid valve 24 is opened (STEP 5).

Next, the timer 41 determines whether a predetermined time has elapsed since the start of the igniter operation (STEP 6), and after the predetermined time has elapsed, the combustion controller 38 stops the ignition operation by the igniter 5 (STEP 7).

Subsequently, the flame detector 39 is connected to the frame rod 6.
It is determined whether or not a flame has been detected by STEP (STEP 8). If a flame has been detected, the timer 41 determines whether or not a time slightly longer than the predetermined time has elapsed since the flame rod was ON (STEP 9). The combustion control unit 38 terminates the operation of the frame rod 6 (STEP 10). Further, the combustion state detector 40 determines whether the electromotive force of the thermocouple 7 is equal to or more than a predetermined value (STEP 11). If the electromotive force is equal to or more than the predetermined value, the use in the hot water mode is continued. The operation control unit determines whether or not switching to the water mode is performed during use in the hot water mode (STEP 12). If the switching is performed, the process proceeds to a second subroutine described later.
Proceed to P13.

The timer 41 determines whether the time for forgetting to turn off has elapsed since the start of the igniter operation (STEP 13), and after the lapse of the time, the combustion controller 38 closes the solenoid valve 24 (STEP 14). The flame is extinguished.

If it is determined in STEP 8 that no flame has been detected and ignition has failed, and if it is determined in STEP 11 that the electromotive force has become less than the predetermined value and misfire or incomplete combustion has occurred, the combustion control unit 38 Closes the electromagnetic valve 24 (STEP 14).

When the use is stopped, FIG.
When the operation switch 8 is turned off as shown in FIG.
5) The water control unit 37 closes the water stop valve 14 according to an instruction from the operation control unit 36 (STEP 16), and the combustion control unit 38 closes the solenoid valve 24 (STEP 17).

The operation of the control device 4 in the hot water supply apparatus of the present invention is characterized by the first subroutine and the second subroutine. These subroutines will be described with reference to FIGS. 4 (a) and 4 (b).

First, FIG. 4A shows the first subroutine.
This will be described with reference to FIG. When the water heater is started to be used in the water mode, the water flow switch 19 is turned on and the hot water switch 2 is turned on.
Operation control unit 36 that has determined that 3 is ON (water mode)
, The combustion control unit 38 starts operating the igniter 5 and the frame rod 6 (STEP 18). The timer 41 determines whether a predetermined time has elapsed from the start of the operation of the igniter 5 (STEP 19), and the combustion control unit 38 terminates the operation of the igniter 5 after the predetermined time has elapsed (STE).
P20). The flame detector 39 determines whether there is a flame (STEP
21) If there is no flame, the timer 41 determines whether a time slightly longer than the predetermined time has elapsed from the start of use of the frame rod 6 (STEP 22).
8 terminates the operation of the frame rod 6 after the lapse of the time (STEP 23). If a flame is detected in STEP 21, the combustion control unit 38 determines that the solenoid valve 24 is not completely closed, activates the buzzer 9 and the lamp 10, and closes the water stop valve 14 via the water control unit 37. (STEP2
4).

By operating the frame rod 6 for a predetermined time slightly longer than the operation time of the igniter 5 in STEP 23 of the first subroutine, the amount of electricity supplied to the frame rod circuit 33 can be reduced as compared with the case of always operating. The life of the battery 28 is not significantly reduced.
As long as the ignition flame by the igniter 5 is detected, the operation time of the frame rod 6 may be reduced to be equal to the operation time of the igniter 5 in order to further reduce the amount of electricity. This also applies to STEP 10 in the main routine.

The second subroutine will be described with reference to FIG. When the hot water supply device is switched to the water mode while being used in the hot water mode and is continuously used, the operation is performed by the operation control unit 36 which determines that the water flow switch 19 is ON and the hot water switch 23 is switched from OFF to ON. Then, an instruction is issued to the combustion control unit 38, the electromagnetic valve 24 is closed (STEP 25), and the operation of the frame rod 6 is started (STEP 26). The flame detector 39 determines whether there is a flame (STEP 27). If there is no flame, the timer 41 determines whether a predetermined time has elapsed since the start of the operation of the frame rod (STEP 28). After a lapse of time, the operation of the frame rod 6 is terminated (STEP
29). If the flame is detected in STEP 27, it is determined that the solenoid valve 24 is not completely closed due to dust or the like, and the combustion control unit 38 activates the buzzer 9 and the lamp 10, and the water control unit The water stop valve 14 is closed via 37 (STEP 30).

By operating the frame rod 6 for a predetermined time in STEP 29 in the second subroutine, the frame rod circuit 33 is operated more than when the frame rod 6 is constantly operated.
The amount of power to the battery 28 can be saved, and the life of the battery 28 is not significantly reduced. Note that the operating time of the frame rod 6 may be shortened as long as it is sufficient to detect the flame remaining in the burner 2 in order to further reduce the amount of electricity.

The above-mentioned STEP 24 and STEP 3
0, the combustion control unit 38 activates the buzzer 9 and the lamp 10 as notification means, and notifies the water stop valve 14 via the water control unit 37 in order to notify the user that the solenoid valve 24 is not completely closed. Is closed, but simply the combustion control unit 38
May operate the notification means, or the combustion control unit 38 may simply close the water stop valve 14 via the water control unit 37.

In the present embodiment, the water stop valve which is continuously energized in the valve open state is used. However, a motor driven water stop valve which is energized and opened and closed by the motor only during driving may be used.

In the hot water supply apparatus of the present embodiment, both the auditory notifying means and the visual notifying means such as the buzzer 9 and the lamp 10 are used in combination, but only one of them is selected. It may be used.

When the controller 4 determines that the solenoid valve 24 is not completely closed when the hot water supply device of the present embodiment is used in the water mode, the buzzer 9 and the lamp 10 serving as the notification means are operated, and the water stop valve 14 is operated. And shut off the water flow. The user notices that the electromagnetic valve 24 is not completely closed due to the operation of the notification means and the stop of the water flow. In addition, the water stop valve 14
Is closed, the water flow pressure to the hydraulic passive unit 15 disappears due to the stop of the water flow, the water pressure responsive valve 25 is closed, and the gas flow into the burner 2 is shut off.

[Brief description of the drawings]

FIG. 1 is a structural explanatory view of a hot water supply apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a control device of the water heater.

FIG. 3 is a flowchart showing a main routine of operation of the water heater.

FIG. 4 is a flowchart showing a subroutine for operating the water heater.

[Explanation of symbols]

1. Water path, 2. Burner, 3. Gas supply path, 4.
Control device (control means), 5 igniter (ignition means), 6 frame rod (flame detection means), 9, 10
..Buzzers, lamps (notifying means), 11.
12. heat exchanger, 13 hot water path, 14 water shutoff valve, 15 water pressure passive unit, 17, 19 water flow detection device, water flow switch (water flow detection means), 23 water hot water switch , 24 .. Solenoid valve, 25 .. Water pressure responsive valve

Claims (6)

[Claims] 1. A hot water supply apparatus, comprising: a water path formed by connecting a water supply path, a heat exchanger, and a tapping path; a water flow detecting means and a hydraulic passive unit provided in the water path; A burner for heating the vessel, a gas supply path to the burner, a solenoid valve provided in the gas supply path, a hydraulic pressure responsive valve driven to be opened and closed by the hydraulic passive unit, and a fault state of the electromagnetic valve. Notification means, ignition means for igniting the burner, flame detection means for detecting the presence or absence of flame of the burner, hot water mode for permitting combustion of the burner, and water mode for inhibiting combustion of the burner. A hot and cold changeover switch for switching, when the water mode is set from a stopped state and use is started, a water flow detection signal from the water flow detection means is received, and the ignition means and the flame detection means are actuated; Receiving the flame detection signal Hot water supply apparatus characterized by comprising a control device for activating the alarm means. 2. A hot water supply apparatus, comprising: a water path formed by connecting a water supply path, a heat exchanger, and a tapping path; a water flow detecting means and a hydraulic passive unit provided in the water path; A burner for heating the vessel, a gas supply path to the burner, a solenoid valve provided in the gas supply path, a hydraulic pressure responsive valve driven to be opened and closed by the hydraulic passive unit, and a fault state of the electromagnetic valve. Notification means, ignition means for igniting the burner, flame detection means for detecting the presence or absence of flame of the burner, hot water mode for permitting combustion of the burner, and water mode for inhibiting combustion of the burner. A hot water switch for switching, and a control means for activating the flame detection means when the mode is switched from the hot water mode to the water mode, receiving the flame detection signal from the flame detection means, and activating the notification means. Hot water supply feature . 3. A hot water supply apparatus, comprising: a water path formed by connecting a water supply path, a heat exchanger, and a tapping path; water flow detection means, a hydraulic pressure passive unit, and a water stop valve provided in the water path. A burner that heats the heat exchanger, a gas supply path to the burner, a solenoid valve provided in the gas supply path, a hydraulic pressure responsive valve that is opened and closed by the hydraulic passive unit, and ignites the burner Ignition means for detecting the presence or absence of flame of the burner, a flame detection means for detecting the presence or absence of flame of the burner, a hot water switch for switching between a hot water mode for permitting combustion of the burner and a water mode for inhibiting combustion of the burner, When the water mode is set and started to be used, the ignition means and the flame detection means are actuated in response to a water flow detection signal from the water flow detection means, and the stop is received in response to a flame detection signal from the flame detection means. Control means for closing the water valve; Hot water supply apparatus characterized by comprising. 4. A hot water supply apparatus, comprising: a water path formed by connecting a water supply path, a heat exchanger, and a tapping path; water flow detecting means, a hydraulic passive section, and a water shutoff valve provided in the water path. A burner that heats the heat exchanger, a gas supply path to the burner, a solenoid valve provided in the gas supply path, a hydraulic pressure responsive valve that is opened and closed by the hydraulic passive unit, and ignites the burner An ignition means for detecting the presence or absence of a flame of the burner, a hot water mode switch for switching between a hot water mode for permitting combustion of the burner and a water mode for inhibiting combustion of the burner, and a hot water mode. A hot water supply device comprising: a control unit that activates the flame detection unit when the mode is switched to the water mode, and receives the flame detection signal from the flame detection unit to close the water stop valve. 5. The control device according to claim 1, further comprising a control unit for operating said ignition means for a predetermined time and operating said flame detection means for a time equivalent to said predetermined time.
The hot water supply device as described. 6. The hot water supply apparatus according to claim 2, further comprising the control means for operating the flame detection means for a predetermined time after switching from the hot water mode to the water mode.