JPH09196466A - Hot water supplying apparatus for bath - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an uncomfortable feeling for an insufficient water amount when a shower is taken from generating by a method wherein the heat-exchange temperature at the time of hot water supplying fan remaining, is judged, and if the heat-exchange temperature is low, the closing motion of a water amount control valve is not performed, and also, at the next hot water feeding, a normal water amount control is immediately performed, and the discharging hot water temperature being equivalent to a set temperature, and a discharging hot water flow rate are ensured. SOLUTION: As soon as a hot water supplying fan remaining is decided by a fan remaining judgment means 22, the temperature of a heat-exchange temperature sensor 18 is detected by a heat-exchange temperature detecting means 20, and by a heat-exchange temperature decrease judgement means 21, whether the heat-exchange temperature is at a specified temperature (To) or lower is judged. When the heat-exchange temperature judgment means 21 judges a signal H wherein the heat-exchange temperature exceeds the specified temperature (To), a water amount control valve 29 is throttled to a specified flow rate by a water amount control valve closing motion control means 24, and that state is kept during the period of the hot water supplying fan remaining. When a signal L wherein the heat-exchange temperature is not more than the specified temperature (To) is judged, the water amount control valve 29 is opened to a fully open position, and that state is kept during the period of the hot water supplying fan remaining.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bath water heater with a bath for a general household, and more particularly to a water amount control at the start of hot water combustion.

[0002]

2. Description of the Related Art In recent years, there has been a demand for improving the quality of hot water in hot water heaters when a hot water tap is used. In particular, after hot water is burned once, hot water is burned again (high temperature hot water), It is essential to eliminate the pre-cooling phenomenon (low-temperature hot water) and constantly discharge hot water at the set temperature.

Therefore, a conventional bath water heater will be described with reference to the drawings. FIG. 12 is a configuration diagram of a conventional bath water heater. In FIG. 12, 39 is a remote controller, 40 is a hot water supply combustion block, 41 is a water amount control valve, 42 is a bypass proportional valve, 43 is a heat exchange temperature sensor, 44 is a hot water temperature sensor, 45 is a pouring valve, and 46 is a bath combustion block. , 47 is a circulation pump, 48 is piping, and 49 is a bath.

Briefly explaining the operation, the hot water supply combustion block 40 is proportionally burned so that the heat exchange temperature detected by the heat exchange temperature sensor 43 becomes a predetermined temperature. Then, the bypass proportional valve 42 is proportionally controlled so that the temperature detected by the tap water temperature sensor 44 becomes the set temperature set by the remote controller 39.

This operation is the same when the pouring operation is performed by opening the pouring valve 45, and the hot water having the temperature set by the remote controller 39 is passed through the circulation pump 47 and the pipe 48 to the bath 4
9 is automatically poured.

Here, a period during which hot water supply combustion is once stopped and only the hot water supply fan operates for a predetermined time (hereinafter referred to as the hot water supply fan remaining). In the control of the water amount control valve 41 and the bypass proportional valve 42, particularly, the operation of maintaining the outlet heated water temperature at a predetermined temperature when hot water is burned again from the hot water supply fan leaving state will be described with reference to FIGS. 12 and 13. .

In FIG. 13, reference numeral 50 is a point extinguishing determination means for detecting that the hot water supply fan is left, and 51 is a water amount control valve 5.
2, the water amount control valve control means having a function of detecting the fully open position P1 and the fully closed position P2, and 53 is a water amount control valve 52 in response to the result of the fire extinguishing determination means 50 determining that the hot water supply fan remains.
Is a full-open drive request means for issuing a drive request to the full-open direction, and 54 is a close-drive request means having a timer means 55 that drives the water amount control valve control means in the full-open direction to detect a full-open position and then count a predetermined time T _A. Is.

The operation will be described. When the point extinguishing determination means 50 determines the hot water supply fan remaining state, the water amount control valve control means 51 temporarily controls the water amount control valve 52 in response to the full opening drive request signal from the full opening drive request means 53. "Fully open position P
Operates in "open direction" up to 1 ".

Next, when the water quantity control valve control means 51 of the water quantity control valve 52 detects the fully open position P1, the water quantity control valve control means 51, while the timer means 55 counts for a predetermined time T _A , this time "close direction". Take action. When the timer means 55 finishes counting the predetermined time T _A , the water amount control valve control means 51 stops the driving.

By the above operation of the water amount control valve, the amount of water is reduced to a predetermined amount. This series of operations is an operation for reducing the flow rate to the heat exchanger side piping of the hot water supply combustion block when tapping hot water again, suppressing a decrease in heat exchange temperature, and preventing a post-boiling phenomenon and a pre-cooling phenomenon. .

The state in which the water amount control valve is squeezed by a predetermined amount is maintained during the state in which the hot water supply fan remains, and waits for hot water to be discharged again.

Next, when the fire extinguishing determination means 50 determines that hot water has been discharged again, the hot water supply combustion block 40 starts hot water supply combustion. Heat exchange temperature sensor 4 when hot water heating starts
The measurement of the heat exchange temperature is started by 3, and the water flow control valve 41 is fixed at the squeezed position until the heat exchange temperature is equal to or higher than the predetermined temperature or the hot water supply combustion reaches the maximum combustion.

[0013]

However, in the above-mentioned structure, when the heat exchanger side pipe is filled with water instead of hot water (heat exchange temperature is low), hot water is burned again by hot water discharge. Even if it is performed, since it takes time for the heat exchange temperature to rise due to combustion, the water amount control valve is kept in the closed position when hot water is used until the heat exchange temperature reaches a predetermined temperature.

Therefore, immediately after the hot water supply is used, the flow rate of discharged hot water remains small, which is inconvenient for the user.

Further, the water amount holding operation as described above is an effective function even in the adjusting operation state in which the gas pressure is adjusted, the water amount control dedicated to the adjusting operation is invalidated, and the performance inspection in the manufacturing process of the bath water heater is performed. It was an action that affected the.

The same is true for the automatic pouring operation. The hot pouring operation is started by the opening operation of the pouring valve 46, but the pouring time is longer because the pouring flow rate is kept small. .

When the heat exchange temperature sensor 43 fails and cannot detect the heat exchange temperature, the condition for canceling the water amount holding operation is not satisfied even if the actual heat exchange temperature rises, and the duration of holding the water amount becomes long, This is also inconvenient for the user.

Further, when the water quantity control valve becomes uncontrollable due to foreign matter being caught in the water quantity control valve circuit, the water quantity control valve is not operated thereafter, so that the water quantity holding operation actually continues, which is also for the user. It was not easy to use.

[0019]

In the bath water heater of the present invention, a heat exchange temperature detecting means for detecting a heat exchange temperature and a fan remaining determination means for determining that the hot water supply is stopped and the hot water supply fan is left in the state. A heat exchanger low temperature determining means for determining the heat exchange temperature immediately after the hot water supply fan remaining state determination, a hot water outlet determining means for determining whether hot water is discharged from a stopped state or a hot water supply fan remaining state, and a hot water supply fan remaining state When the hot water is discharged from the hot water, the operation to squeeze the water amount by a predetermined amount and the water amount holding operation after the hot water are performed at the time of the high temperature judgment of the heat exchange temperature low temperature judging means, and the operation to open the water amount to the fully open position and the water amount holding operation are prohibited at the low temperature judgment. Sequence control means is provided.

According to the present invention, the heat exchange temperature at the time when the hot water supply fan is left is determined, and if the heat exchange temperature is low, the water amount control valve is not closed and the normal water amount control is performed immediately at the next hot water discharge. , It is possible to secure the hot water temperature and hot water flow rate corresponding to the set temperature, eliminate the discomfort caused by the small amount of water when using the shower, and improve the usability.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A first means of the present invention is a heat exchange temperature detecting means for detecting a heat exchange temperature, and a fan leaving determination means for determining that hot water supply is stopped and a hot water supply fan is left. Low heat exchanger temperature determining means for determining the heat exchange temperature immediately after the hot water supply fan remaining state is determined, hot water determination means for determining whether hot water has been discharged from the stopped state or hot water supply fan left state, and hot water discharge from the hot water supply fan left state In the case where the heat exchange temperature low temperature determining means determines a high temperature, an operation of squeezing the water amount by a predetermined amount and a water amount holding operation after the hot water is discharged are performed, and in a low temperature determination, an operation of opening the water amount to the fully open position and a water amount holding operation are prohibited. It is provided with a sequence control means.

The second means of the present invention is provided with adjusting operation switching means for adjusting gas pressure and the like, and adjusting operation judging means for judging switching of the adjusting operation switching means, and when hot water is discharged from a state where the hot water supply fan is left. However, it is provided with a sequence control means for canceling the water amount holding operation during the adjusting operation.

Further, the third means of the present invention is provided with a pouring operation judging means for judging an automatic pouring operation, so that the holding operation of the water amount is released while pouring the water even when the hot water is left out from the hot water supply fan leaving state. It is provided with a sequence control means.

A fourth means of the present invention is to provide a heat exchange temperature sensor failure detection means, and a sequence control means for immediately canceling the holding operation of the water amount when the heat exchange temperature sensor failure is detected. is there.

Further, a fifth means of the present invention comprises a water quantity control valve failure detecting means, a timer means for counting a predetermined time when the water quantity control valve fails, and a water quantity control valve only while the timer means is counting a predetermined time. The opening operation means for instructing the "open direction" operation is provided, and when the water volume control valve fails, the improvement operation sequence control means for driving the water volume control valve in the "open" direction for a predetermined time to secure the hot water discharge flow rate is provided. is there.

According to the first means of the present invention, when the temperature of the heat exchanger is lower than the predetermined temperature, the water flow control valve is fully opened,
Moreover, the normal water amount control can be performed immediately without performing the water amount holding operation when the hot water is again discharged.

Further, by the second means of the present invention, if the adjustment operation state is switched to, the holding operation of the water amount control is immediately released, so that the dedicated water amount control operation in the manufacturing process can be performed.

Further, when the start of the pouring operation is judged by the third means of the present invention, the water amount holding operation is immediately released, so that the water amount control can be performed with the normal calculated value as the target water amount.

Further, according to the fourth means of the present invention, when the heat exchange temperature cannot be normally detected due to the failure of the heat exchange temperature sensor, the normal water amount control can be immediately performed.

Further, when it is detected by the fifth means of the present invention that the water amount control valve cannot be controlled normally, the water amount control valve is driven in the "open" direction for a predetermined time, so that a large amount of hot water flow is ensured. You can

An embodiment of claim 1 of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a bath water heater according to an embodiment of the present invention. 1 is a remote control, 2 is a bath water heater, 3 is a bathtub, 4
Is a hot water supply combustion block, 5 is a bath combustion block, 6 is a flow rate sensor, 7 is a hot water supply heat exchanger, 8 is a heat exchange side pipe, 9 is a bypass side pipe, 10 is a heat exchange temperature sensor, 11 is a hot water temperature sensor, 12 Is a bypass proportional valve, 13 is a water flow control valve, 14 is a pouring valve, 15 is a bath heat exchanger, 16 is piping,
Reference numeral 17 is a control device for controlling the entire bath water heater 2.

The operation will be briefly described below.
When the amount of water is detected by the hot water supply combustion block 4, hot water supply combustion starts. When hot water supply combustion starts, the hot water temperature of the heat exchange side pipe 8 is detected by the heat exchange temperature sensor 10, and the hot water supply combustion block 4 is proportionally burned so that the heat exchange temperature reaches a predetermined temperature.

Then, the amount of water in the bypass side pipe 9 is proportionally controlled by the bypass proportional valve 12 so that the hot water temperature detected by the hot water temperature sensor 11 becomes the set temperature set by the remote controller 1.

The total flow rate is controlled by the water flow control valve 13 so that a predetermined temperature and flow rate are discharged from the faucet.

The above operation is the same when the pouring operation is performed by opening the pouring valve 14, and the hot water temperature set by the remote controller 1 passes through the bath heat exchanger 15 and the pipe 16. It is automatically poured into the bathtub 3.

The operation of claim 1 of the present invention when hot water is discharged from the remaining hot water supply fan will be described with reference to the drawings.

In FIG. 2, 18 is a heat exchange temperature sensor, and 19
Is a flow rate sensor, 20 is heat exchange temperature detection means, 21 is heat exchange temperature low temperature determination means, 22 is fan remaining determination means, 23 is hot water discharge determination means, 24 is water volume control valve closing control means, and 25 is water volume control valve fully open control. Means, 26 is release temperature detecting means, 27
Is a holding control means, 28 is a normal control means, and 29 is a water amount control valve.

To explain the operation, when the faucet (not shown) is closed during hot water supply combustion and the flow rate sensor 19 detects the amount of fire extinguishing water, the fan remaining amount determining means 22 determines this and sets the hot water supply fan left state. .

Simultaneously with the hot water supply fan remaining determination of the fan remaining determination means 22, the temperature of the heat exchange temperature sensor 18 is detected by the heat exchange temperature detection means 20, and the heat exchange temperature decrease determination means 21 determines that the heat exchange temperature is a predetermined temperature. It is determined whether T ₀ or less.

When the heat exchange temperature low temperature determination means 21 determines the signal H at which the heat exchange temperature exceeds the predetermined temperature T ₀ , the water quantity control valve closing operation control means 24 throttles the water quantity control valve 29 to a predetermined flow rate to supply the hot water supply fan. The state is retained for the remaining period.

Next, when the heat exchange temperature / low temperature determining means 21 determines the signal L whose heat exchange temperature is equal to or lower than the predetermined temperature T ₀ , the water amount control valve fully opening control means 25 opens the water amount control valve 29 to the fully open position, The state is maintained during the period when the hot water supply fan remains.

As described above, it is determined whether the water amount control valve 29 is to be throttled or opened depending on the heat exchange temperature, and the next hot water is awaited.

Next, the flow rate sensor 19 detects the amount of ignition water, and when the hot water discharge determining means 23 determines that there is hot water while the fan is left, the following water amount control is performed.

First, when the heat exchange temperature / low temperature determination means 21 determines the signal H, the release temperature detection means 26 determines whether the heat exchange temperature is equal to or higher than the predetermined temperature T ₁ . While the release temperature detecting means 26 is detecting the heat exchange temperature equal to or lower than the predetermined temperature T ₁ , the holding control means 27 holds the control position narrowed down by the water amount control valve closing control means 24 so as not to increase the flow rate of hot water. .

When the release temperature detecting means 26 detects that the heat exchange temperature is lower than the predetermined temperature T ₁ , the normal control means 28 switches the water quantity control valve 29 from the throttled state to the normal control state to control the water quantity.

Next, when the heat exchange temperature / low temperature judging means 21 judges the signal L, the water quantity control valve 29 is brought into the normal state by the normal control means 28 at the same time when the hot water is discharged, and the water quantity is controlled. FIG. 3 shows a schematic flowchart of the contents of the above operation.

As described above, when the heat exchange temperature is lower than the predetermined temperature T ₁ in advance, the normal water amount control can be immediately performed when tapping hot water without closing the water amount control valve.

In the above description, the determination temperature is explained as a heat exchange temperature (absolute value), but it can be determined as a deviation temperature (relative value). This means that when a microcomputer is installed, a dedicated circuit is added as an external circuit. It can be easily realized by changing the configuration of the program without changing.

Next, a second embodiment of the present invention will be described with reference to the drawings. In the description, the same contents as those of the embodiment of claim 1 are omitted and different points will be described.

FIG. 4 is a block diagram relating to a water amount control when tapping hot water while leaving the hot water supply fan in the embodiment of the second means of the present invention. In FIG. 4, 30 is an adjusting operation switching means, 3
Reference numeral 1 is an adjustment operation determination means, and 32 is an adjustment dedicated control means.

Regarding the operation, the case where hot water is discharged while the hot water supply fan is left will be described. When the hot water is discharged, the holding control means 27 holds the position of the water amount control valve 29 throttled by the closing control means 24, and the release temperature detecting means 26 holds the predetermined temperature T _1.
It continues until the above is judged.

During this time, when the adjustment operation switching means 30 switches from the normal combustion state to the combustion state for adjustment operation, the adjustment operation determination means 31 determines that,
This is transmitted to the holding control means 27 and the adjustment-dedicated control means 32. The holding control means 27 releases the holding operation of the water amount control valve 29 at the same time when the adjusting operation is switched.

Then, the water amount control dedicated to the adjustment operation is performed by the adjustment dedicated control means 32 (for example, the adjustment operation "1" is a state in which the pressure is adjusted during the minimum combustion, and the water amount control is controlled to the minimum flow rate, for example, 6 L / min. ). I do. FIG. 5 shows a schematic flowchart of the contents of the above operation.

By switching the adjustment operation as described above, the water quantity control by the water quantity control valve can be switched to the water quantity control dedicated to the immediate adjustment operation even during the water quantity control holding operation.

Next, an embodiment of claim 3 of the present invention will be described with reference to the drawings. In the description, the same contents as the embodiment of claim 1 will be omitted and only different points will be described.

FIG. 6 is a block diagram relating to the water amount control when tapping hot water while leaving the hot water supply fan in the embodiment of the third means of the present invention. In FIG. 6, 33 is a remote controller, and 34 is a pouring operation determination means.

Regarding the operation, a case where the automatic hot water beam switch (not shown) in the remote controller 33 is operated while the hot water supply fan is left will be described.

As described in the embodiment of the second means of the present invention, the water amount control valve 29 is throttled to a predetermined amount by the closing control means 24 and waits for the release temperature detecting means 26 to detect the predetermined temperature T ₁ . Is in a state.

At this time, when the automatic hot water beam switch is turned on, a pouring valve (not shown) is opened to start automatic pouring, and hot water supply combustion is started.

On the other hand, when the pouring operation judging means 34 judges the ON operation of the automatic hot water beam switch, the holding control means 27
And the judgment result to the normal control means 28, and the holding control means 2
7 releases the holding operation of the water amount control valve 29. Then, a normal water amount control (for example, 18 L
/ Min control).

FIG. 7 shows a schematic flowchart of the contents of the above operation. Next, a fourth embodiment of the present invention will be described with reference to the drawings. In the description, the same contents as the embodiment of claim 1 will be omitted and only different points will be described.

FIG. 8 is a block diagram relating to the control of the amount of water when tapping hot water while leaving the hot water supply fan in the embodiment of the fourth means of the present invention. In FIG. 8, 35 is a heat exchange temperature abnormality determination means.

Regarding the operation, the case where hot water is discharged while the hot water supply fan remains will be described. When the hot water is discharged, the holding control means 27 holds the position of the water amount control valve 29 throttled by the closing control means 24, and the release temperature detecting means 26 holds the predetermined temperature T _1.
It continues until the above is judged.

During this period, when the heat exchange temperature abnormality determining means 35 detects an abnormality in the heat exchange temperature (high temperature side abnormality or low temperature side abnormality), the result is transmitted to the holding control means 27 and the normal control means 28. The holding control means 27 detects the abnormality of the heat exchange temperature and releases the holding operation of the water amount control valve 29 at the same time.

Then, the normal control means 28 carries out a normal water amount control (for example, control at 24 L / min). FIG. 9 shows a schematic flowchart of the contents of the above operation.

Next, a fifth embodiment of the present invention will be described with reference to the drawings. In the description, the same contents as the embodiment of claim 1 will be omitted and only different points will be described.

FIG. 10 is a block diagram relating to the water amount control at the time of tapping hot water while leaving the hot water supply fan in the embodiment of the fifth means of the present invention. In FIG. 10, 36 is a failure detecting means for detecting a control failure of the water amount control valve 29, and 37 is a predetermined time t _0.
And 38 is an opening control means for driving and controlling the water amount control valve 29 in the "opening direction" while the timer means 37 is counting.

The operation will be described. From the time when the hot water supply fan is left, the closing control means 24 or the full-opening control means 25.
While the water amount control valve 29 is being closed or opened, the failure detection means 36 constantly monitors the failure.

Similarly, even when the normal control means 28 is opened and closed when hot water is discharged, the failure detection means 36 constantly monitors the failure.

If the failure detecting means 36 detects a control failure of the water amount control valve 29 during the closing drive by the closing control means 24, the combustion starts when the hot water is left in the hot water supply fan. Even if the heat exchange temperature rises and the release temperature determination means 26 detects the predetermined temperature T ₁ or higher and tries to switch the water amount control valve 29 to the normal water amount control, the water amount control valve 29 is already in operation.
Is in a failure detection state and cannot be driven, and the water volume remains squeezed.

[0071] Therefore, the timer means 37 for counting a predetermined time t ₀ at the same time fault detection and fault detection means 36 sets a predetermined time t _0, and opening control unit 38 again "opening direction of the water amount control valve 29 at To drive.

When the timer means 37 has finished counting the predetermined time t ₀ , the opening control means 38 stops the driving of the water amount control valve 29.

[0073]

According to the first means of the present invention, the heat exchange temperature at the time when the hot water supply fan is left is determined. If the heat exchange temperature is low, the water quantity control valve is not closed and the next normal hot water discharge is performed immediately. Since the amount of water is controlled, it is possible to secure the hot water temperature and the hot water flow rate that are equivalent to the set temperature, eliminate the discomfort caused by the small amount of water when using the shower, and improve the usability.

Further, when the adjustment operation is switched by the second means of the present invention, the water amount control during the immediate adjustment operation is performed,
The amount of water can be confirmed without any problem in the performance inspection when assembling the bath water heater.

Further, when the pouring operation is performed by the third means of the present invention, the normal amount of water is immediately controlled, so that the automatic pouring can be performed without increasing the automatic pouring time and the usability can be improved. I can.

Further, according to the fourth means of the present invention, when a failure of the heat exchange temperature sensor, the detection circuit, etc. is detected, the normal amount of water is immediately controlled, so that the amount of hot water discharged can be secured and the usability when using hot water is improved. Can be improved.

Further, according to the fifth means of the present invention, when the water amount control valve detects a failure due to dust trapping or the like for control, the water amount control valve is driven in the opening direction again for a predetermined time, so that the flow rate at the time of tapping is secured. Because it is possible, usability can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a bath water heater according to an embodiment of the present invention.

FIG. 2 is a block diagram of a bath water heater of an embodiment according to claim 1 of the present invention.

[Fig. 3] Flow chart of the bath water heater

FIG. 4 is a block diagram of a bath water heater of an embodiment according to claim 2 of the present invention.

[Fig. 5] Flow chart of the bath water heater

FIG. 6 is a block diagram of a bath water heater of an embodiment according to claim 3 of the present invention.

[Figure 7] Flow chart of the bath water heater

FIG. 8 is a block diagram of a bath water heater of an embodiment according to claim 4 of the present invention.

FIG. 9: Flow chart of the bath water heater

FIG. 10 is a block diagram of a bath water heater of an embodiment according to claim 5 of the present invention.

FIG. 11: Flow chart of the bath water heater

FIG. 12 is a configuration diagram of a conventional gas bath water heater.

FIG. 13 is a block diagram illustrating the operation of the water heater.

FIG. 14 is a flowchart showing an operation procedure of the water heater.

[Explanation of symbols]

 2 Bath water heater 6 Flow rate sensor 7 Hot water heat exchanger 8 Heat exchange side piping 10 Heat exchange temperature sensor 11 Hot water temperature sensor 13 Water flow control valve 14 Pouring valve 15 Bath heat exchanger 17 Control means

(72) Inventor Hirofumi Kawashima 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Shuichi Takemura, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (5)

[Claims] 1. A heat exchange temperature detecting means for detecting a heat exchange temperature, a fan leaving determining means for determining that hot water supply is stopped and a hot water supply fan is left, and a heat exchange temperature immediately after a hot water supply fan left state is determined. Heat exchange temperature low temperature determination means for determining,
When the hot water is discharged from the stopped state or when the hot water supply fan is left, the hot water discharge determining means, and when the hot water supply fan is left and the hot water is discharged from the hot water supply fan left state, when the high temperature is determined by the heat exchange temperature low temperature determination means, the amount of water is reduced by a predetermined amount. A bath water heater equipped with sequence control means for performing an operation and a water amount holding operation after the hot water is discharged, and prohibiting the water amount opening operation and the water amount holding operation when a low temperature is determined. 2. An adjusting operation switching means for adjusting gas pressure and the like, and an adjusting operation judging means for judging switching of the adjusting operation switching means are provided, and even if hot water is discharged from the hot water supply fan leaving state, if the adjusting operation is still in progress. The bath water heater according to claim 1, further comprising sequence control means for canceling a water amount holding operation. 3. A pouring operation determining means for determining an automatic pouring operation is provided, and even when hot water is discharged from a state in which the hot water supply fan remains.
2. The bath water heater according to claim 1, further comprising sequence control means for canceling the operation of holding the amount of water during pouring. 4. A heat exchange temperature sensor failure detection means is provided,
2. The bath water heater according to claim 1, further comprising sequence control means for canceling a water amount holding operation when the heat exchange temperature sensor fails. 5. A water quantity control valve, a water quantity control valve failure detection means for detecting a failure of the water quantity control valve, a timer means for counting a predetermined time when the water quantity control valve fails, and a predetermined time of the timer means. Opening means for instructing to operate the water quantity control valve in the "open direction" only during counting is provided, and when a failure of the water quantity control valve is detected, the water quantity control valve is driven in the "open" direction for a predetermined time and the flow rate of the hot water is discharged. The bath water heater according to claim 1, further comprising: an improved operation sequence control means for ensuring the above.