JPH0745968B2 - Hot water heater with additional heating function - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a water heater with a reheating function for automatically supplying hot water to a bathtub.

2. Description of the Related Art In recent years, a water heater with a reheating function has been developed that combines a water heater and a bathtub and combines a reheating machine that circulates hot water with a pump. Baths such as added ones are being automatically supplied.

A conventional water heater with a reheating function will be described below with reference to the drawings. FIG. 4 shows a schematic diagram of the configuration of the conventional example.

A heat exchanger 1 for hot water supply is connected to the water supply port 1a and the hot water supply port 1b. Reference numeral 2 denotes a heat exchanger for additional heating, which is connected to the hot water return port 2a and the hot water outlet port 2b. A pump 3 is provided in the hot water passage from the hot water return port 2a to the heat exchanger 2 for additional heating, and a bathtub 4 is connected between the hot water return port 2a and the hot water outlet port 2b by a connecting pipe 5 to form a hot water circulation passage. Constitute. Each of the heat exchangers 1, 2
An exhaust pipe 6 is connected to the exhaust pipe 6, and the exhaust fan 7 discharges the combustion exhaust gas to the exhaust port 8. Further, it is formed in a part of the case 10 so that combustion air can be supplied from the air supply port 9. The fuel passage is branched from the original solenoid valve 11, to the hot water supply burner 14 through the hot water supply solenoid valve 12 and the proportional control valve 13, and to the additional heating burner 16 through the additional heating solenoid valve 15.
Are connected to each.

Water supply detection element 17 that detects water supply in the water supply side passage and outputs a signal
In addition to the above, a hot water supply thermistor 18 for detecting the hot water supply temperature is provided at the outlet of the hot water supply heat exchanger 1. A circulating water detecting element 19 for detecting circulation of hot water is provided in a hot water passage leading to the pump 3 and the heat exchanger 2 for heating, and an additional hot water detecting element for detecting hot water temperature at the inlet of the heat exchanger 2 for heating. A thermistor 20 for heating is provided. The hot water supply system 21 is connected to the hot water supply port 1b through, for example, a hot water supply pipe 22 to a bathroom or a kitchen, and a hot water supply control valve 24 and a hopper 25 for automatically supplying hot water to a bathtub.
An automatic hot water supply unit 23 having a water level sensor 26 for bath water is provided so as to branch from the hot water supply pipe 22 and connected to the bath 4.

The actuator (electromagnetic valve, pump, etc.) is configured to be operated by the control circuit 27 and the remote controller 28 in response to signals from the various sensors.

Next, the operation will be explained. By opening the hot water dispenser 21,
Water flows into the water supply passage, the water supply detection element 17 operates, the main solenoid valve 11, the hot water supply solenoid valve 12 and the proportional control valve 13 open, and the fuel flowing to the hot water supply burner 14 is ignited to ignite the hot water supply thermistor 18. Signal to cause the proportional control valve 13 to operate with the output processed by the control circuit 27 so that the hot water supply temperature becomes the hot water supply temperature set by the hot water supply hot water temperature setting device (not shown) of the remote controller 28. The combustion amount of the hot water supply burner 14 is controlled to stably control the hot water supply temperature.

On the other hand, by operating an additional heating switch (not shown) provided on the remote controller 28, the pump 3 is operated to circulate the water or hot water previously stored in the bathtub 4, and the circulating water detecting element 19 which detects this is detected. Operates, the original solenoid valve 11, solenoid valve for additional heating
The valve 15 opens to ignite the fuel that has flowed to the additional burner 16. Then, the circulating hot water temperature is sensed and set by the signal from the additional heating thermistor 20 provided at the inlet of the additional heat exchanger 2 and the bath water temperature setting device (not shown) of the remote controller 28. The control circuit 27 is operated so that the bath heating temperature is reached, the additional heating solenoid valve 15 is operated, the combustion amount of the additional heating burner 16 is controlled, and the circulating hot water is stably controlled to control the bath water temperature. Is configured to control.

When an automatic hot water supply operation switch (not shown) provided on the remote control 28 is operated, the hot water supply control valve 24 of the automatic hot water supply unit 23 is opened and set by the hot water supply hot water temperature setting device (not shown) of the remote control 28. Control circuit so that the automatic hot water temperature
The proportional control valve 13 is operated with the output calculated in 27 to control the combustion amount of the hot water supply burner 14 to stably control the hot water supply temperature, thereby automatically supplying hot water to the bathtub 4. Then, in order to cover the decrease in the hot water supply temperature due to the length of the hot water supply pipe 22, the water level sensor 26 operates to close the hot water supply control valve 24 to stop the automatic hot water supply, and then the pump 3 is turned on. The controller circuit 27 is operated to operate the control circuit 27 so that the signal from the reheating thermistor 20 and the bath water temperature set by the bathtub hot water temperature setting device (not shown) of the remote controller 28 are reached. The operating solenoid valve 15 is operated to control the combustion amount of the reburning burner 16 to stably control the circulating hot water to control the bath water temperature.

Problems to be Solved by the Invention However, in the above-described configuration, the automatic hot water supply unit 23 needs to be installed in the immediate vicinity of the bathtub 4, and is installed when the bathroom is in the center of the room due to the configuration of the building. However, even if it could be installed on the wall side, there were problems such as a defect in the appearance and aesthetics of the building.

Further, after the automatic hot water supply operation, the additional heating operation is required, and it takes time to reach the bath boiling temperature, which is uneconomical.

In view of the above problems, the present invention intends to provide an automatic hot water supply function which is inexpensive and inexpensive, and which is effective in terms of workability and aesthetics because the facility is free.

Means for Solving the Problems In order to solve the above problems, the water heater with a reheating function of the present invention is a heating water for a hot water circulation passage which is connected to a hot water heat exchanger and a bath and circulates hot water with a pump. An exchanger, a proportional control valve connected in series with the original solenoid valve, and a hot water supply solenoid connected branching from the proportional control valve to each of the hot water supply burner and the additional heating burner desired for each heat exchanger. Valve and solenoid valve for reheating, installed at the outlet of the heat exchanger for hot water supply, installed at the inlet of the thermistor for hot water supply and heat exchanger for heating hot water, for hot water heating for detecting circulating water A thermistor, a hot water supply passage downstream of the hot water supply thermistor, and a hot water supply flow rate control valve provided in a bathtub automatic hot water supply passage connected to the bathtub, and a water supply passage of the heat exchanger for hot water supply. It has a water supply detection element and a control circuit During hot water operation, the control circuit opens the hot water supply flow rate control valve, operates the proportional control valve according to a control signal that is arithmetically processed by the signal of the hot water supply thermistor, and controls the combustion amount of the hot water supply burner. Automatically supply hot water to the bathtub to reach the desired hot water temperature (desired bath boiling temperature), and close the hot water supply flow control valve at an arbitrary set amount by the signal from the water supply detection element to stop automatic hot water supply. Along with the automatic hot water supply operation without additional heating operation, the signal from the hot water supply thermistor is lower than the automatic hot water supply set temperature when the water temperature is low during the automatic bath hot water supply, such as during the winter season, or due to the use of multiple taps. When the hot water supply capacity is exceeded, the solenoid valve for additional heating is opened by the signal of the control circuit to burn the additional heating burner at the same time and the pump is also rotated to circulate hot water. While configuring the control circuit to automatically hot water into the bathtub.

With the above-described configuration, the present invention operates the proportional control valve with the output calculated by the control circuit by the signal of the hot water supply thermistor to control the combustion amount of the hot water supply burner and stabilize the hot water supply temperature during the hot water supply operation. It can be controlled. Further, during the heating operation, the proportional control valve is operated by the output processed by the control circuit according to the signal from the heating thermistor to control the combustion amount of the heating burner to stably control the bath water temperature. .

Further, during simultaneous operation of both of the above, the control circuit preferentially operates the proportional control valve with the output calculated in the hot water supply mode to stably control the hot water supply temperature, and the heating side outputs the signal of the heating thermistor. By controlling the opening and closing of the additional heating solenoid valve, the bath water temperature can be controlled stably.

Furthermore, during the automatic hot water supply operation, the hot water supply flow rate control valve is opened to automatically supply hot water from the hot water supply heat exchanger to the bathtub through the bathtub automatic hot water supply passage, and the automatic hot water supply temperature is calculated by the control circuit using the signal from the hot water supply thermistor. The proportional control valve is operated with the generated output to control the combustion amount of the hot water supply burner.
When the temperature of the water is lower, such as in winter, or when the hot water supply plug is used, the signal of the thermistor for hot water supply becomes lower than the set temperature for automatic hot water supply. Is lower than the set temperature for bath heating, so the solenoid valve for additional heating is opened to burn the additional heating burner at the same time, and the pump is also rotated to automatically supply hot water to the bathtub while circulating hot water (heating operation). As a result, it is possible to automatically supply hot water to the initial bath boiling temperature of the bathtub in a short time. Further, the hot water supply flow rate control valve can be closed at an arbitrary set amount by the signal of the water supply detecting element to stop the automatic hot water supply in the bathtub.

In addition, the number of parts can be reduced, the automatic hot water supply function can be manufactured at low cost, and the installation can be freely performed to improve the workability and aesthetics to achieve the purpose.

Embodiment An embodiment of the present invention will be described below with reference to the schematic configuration diagram of FIG.

Reference numeral 1 is a heat exchanger for hot water supply, which is connected to the water supply port 1a and the hot water supply port 1b, and has a water supply detection element (a water amount sensor for counting the amount of water, etc.) 17 which detects water supply in the water supply side passage and outputs a signal. Reference numeral 2 denotes a heat exchanger for additional heating, which is connected to the hot water return port 2a and the hot water outlet port 2b. A pump 3 and a circulating water detecting element 19 for detecting circulation of hot water are provided in a hot water passage extending from the hot water returning port 2a to the heat exchanger 2 for additional heating, and a bathtub 4 is provided between the hot water returning port 2a and the hot water outgoing port 2b. Are connected by a connecting pipe 5 to form a hot water circulation passage. An exhaust pipe 6 is connected to each of the heat exchangers 1 and 2, and a combustion exhaust gas is discharged to an exhaust port 8 by an exhaust fan 7. Further, it is formed in a part of the case 10 so that combustion air can be supplied from the air supply port 9. The fuel passage connects the original solenoid valve 11 and the proportional control valve 13 in series, and branches from this to the hot water supply burner 14 through the hot water supply solenoid valve 12, and the additional heating burner 16 through the additional heating solenoid valve 15,
A branch connection is made so that the proportional control valves 13 are commonly connected.

Next, the control circuit configuration schematic diagram of FIG. 2 will also be described.

The control circuit 27 controls the temperature of the hot water supply thermistor 18 for detecting the hot water supply temperature provided at the outlet of the hot water supply heat exchanger 1 and the hot water supply temperature set by the hot water supply temperature setting device 31 of the remote controller 28.
The comparator 32 performs a comparison calculation, and the proportional control valve drive unit 34 is operated by the output processed by the calculation processing unit 33 to operate the proportional control valve.
A hot water supply operation control unit 38 is configured to operate 13 to control the combustion amount of the hot water supply burner 14 to stably control the hot water supply temperature.

On the other hand, the bath boiling temperature set by the signal of the additional heating thermistor 20 for detecting the circulating hot water temperature provided at the inlet of the additional heating heat exchanger 2 and the bath water temperature setting device 35 of the remote controller 28 is set. , The comparator 33 of the control circuit 27 performs comparison calculation, and the calculation processing unit 33
The proportional control valve drive unit 34 is operated by the output processed by the above, the proportional control valve 13 is operated, the combustion amount of the additional heating burner 16 is controlled, and the circulating hot water is stably controlled to control the bath water temperature. The additional heating control unit 37 is configured to control the.

In addition, in order to speed up the rise of bath water temperature, the proportional control valve 13
The combustion amount of the additional heating burner 16 controlled by up to the bath boiling temperature set by the bath water temperature setting device 35, when the boiling temperature is reached by controlling the maximum capacity without proportional control, the The control circuit so as to close the solenoid valve 15 for additional heating
The additional heating control unit 37 of 27 is configured.

The hot water supply solenoid valve 12 and the hot water supply solenoid valve 15 are configured with a hot water supply operation control unit 37 and a hot water supply operation control unit 38 so as to open and close when controlling the respective hot water temperatures.

In the simultaneous operation, the hot water supply operation control unit of the control circuit 27
In the hot water supply mode preferentially at 38, the proportional control valve drive unit 34 is operated by the output processed by the calculation processing unit 33 to operate the proportional control valve 13 to stably control the hot water temperature, and at the reheating side. The open-burn operation control unit 37 is configured to control the bath hot water temperature stably by controlling the open-close solenoid valve 15 to open and close by the signal from the add-heat thermistor 20.

Furthermore, during the automatic hot water supply operation, the hot water supply flow rate control valve 24 and safety valve
29 (vacuum breaker) is provided so as to be branched from the hot water supply passage downstream of the hot water supply thermistor 18 and connected to the bathtub 4 through the bathtub automatic hot water supply passage 30. Then, the hot water supply flow control valve is signaled by the signal from the hot water supply operation control unit 38.
By opening the valve 24, the hot water supply heat exchanger 1 is passed through, the comparator 32 of the control circuit 27 performs a comparison calculation by the signal of the hot water supply thermistor 18, and the calculation processing unit 33 performs a calculation process. With this output, the proportional control valve drive unit 34 is operated, the proportional control valve 13 is operated, the combustion amount of the hot water supply burner 14 is controlled, and the hot water supply temperature is stably controlled.
The hot water supply operation control unit 38 is configured to automatically supply hot water to the.

Also, when the water temperature is low, such as in the winter, or the use of multiple hot water supply taps exceeds the hot water supply capacity, the signal from the hot water supply thermistor 18 becomes lower than the set temperature for automatic hot water supply, and there is a large deviation from the desired bath boiling temperature. When a comparison is made by the comparator 32, the pump 3 is also rotated to circulate hot water, the circulating water detecting element 19 is operated to operate the additional heating operation control section 37, and the additional heating solenoid valve is operated. The hot water supply burner 16 is simultaneously burned by opening the valve 15 to automatically supply hot water to the bathtub 4 while controlling the hot water temperature of the bathtub, and the signal of the water supply detection element 17 is measured to control the hot water supply flow rate. The hot water supply operation control unit 38 is configured so that the hot water bath temperature is automatically stopped and the hot water supply is stopped in a short time to the desired bath boiling temperature by closing the valve 24 at an arbitrary set amount.

The operation of the above embodiment will be described.

I, Hot water supply operation When the hot water supply pipe 21 connected to the hot water supply port 1b is used to open a hot water supply pipe 21 in a bathroom or kitchen, for example, the water supply detecting element 17 detects the water supply and the hot water supply operation sequence is operated. The portion 38 is configured and the exhaust fan 7 rotates. The original solenoid valve 11, the hot water solenoid valve 12, and the proportional control valve 13 are opened, and the fuel is ignited and held. (Ignition holding means is not particularly shown) Then, the hot water supply burner 14 burns to heat the hot water supply heat exchanger 1, and the hot water is discharged from the hot water supply pipe 21 through the hot water supply port 1b.

The hot water temperature is detected by the hot water supply thermistor 18 and the remote control
The comparator 32 of the control circuit 27 performs a comparative calculation so that the hot water supply temperature set by the hot water supply temperature setting device 31 of 28 is reached, and the calculation processing unit 33
The proportional control valve drive unit 34 is operated by the output calculated in the above step to operate the proportional control valve 13, and the combustion amount of the hot water supply burner 14 is controlled to stably control the hot water temperature.

II, Reheating Operation On the other hand, the pump 3 and the exhaust fan 7 are rotated by operating a reheating operation switch (not shown) provided on the remote controller 28.

When the hot water or water stored in advance in the bathtub 4 is circulated by the pump 3, the circulating water detecting element 19 detects the circulating water and the reheating operation sequence operates so that the reheating operation control unit 37 is configured. The original solenoid valve 11, the solenoid valve 15 for additional heating, and the proportional control valve 13 are opened to keep the fuel ignited. (Ignition holding means is not particularly shown) Then, the heating burner 15 is burned to heat the heating heat exchanger 2 and circulates in the bathtub 4 from the hot water outlet 2b through the connecting pipe 5 to generate hot water. Hot water is circulated through the return port 2a. The comparator 36 of the control circuit 27 compares the circulating hot water equal to the hot water in the bathtub 4 with the signal from the additional thermistor 20 and the bath boiling temperature set by the bathtub hot water temperature setter 35 of the remote controller 28. The proportional control valve drive unit 34 is operated by the output calculated by the arithmetic processing unit 33, and the proportional control valve 13 is operated.
The combustion amount of the additional heating burner 16 is controlled to stably control the circulating hot water to control the bath water temperature.

In addition, in order to speed up the rise of bath water temperature, the proportional control valve 13
The amount of combustion of the additional heating burner 16 controlled by up to the bath boiling temperature set by the bath water temperature setting device, when the boiling temperature is reached by controlling the maximum capacity without proportional control,
The reheating operation control unit 37 so as to close the reheating solenoid valve 15.
Controlled by.

III, automatic hot water supply operation When the automatic hot water supply operation switch provided on the remote controller 28 is operated, the hot water supply flow control valve 24 is opened, and hot water is automatically supplied to the bathtub 4 through the hot water supply heat exchanger 1 and the bathtub automatic hot water supply passage 30. It The hot water supply operation controller 38 detects the water supply by the water supply detecting element 17 so that the automatic hot water supply operation sequence operates.
And the exhaust fan 7 rotates. Original solenoid valve 1
1. Open the hot water supply solenoid valve 12 and the proportional control valve 13 to keep the fuel ignited. (Ignition holding means is not particularly shown) Then, the hot water supply burner 14 burns to heat the hot water supply heat exchanger 1, and the hot water supply flow rate control valve 24 and the bathtub automatic hot water supply passage
Hot water is automatically supplied to the bathtub 4 through 30. The hot water supply temperature is detected by the hot water supply thermistor 18 and compared by the comparator 32 of the control circuit 27 so as to reach the hot water supply temperature (desired bath boiling temperature) set by the automatic hot water supply hot water temperature setting device 31 of the remote controller 28. A burner for hot water supply is operated to operate the proportional control valve drive unit 34 by operating the proportional control valve drive unit 34 with the output processed by the arithmetic processing unit 33.
The hot water supply temperature is controlled stably by controlling the combustion amount of 14, and the hot water is automatically supplied to the bathtub 4.

By doing so, it is possible to complete the operation only by the automatic hot water supply operation without the operation of heating the bath to the desired bath boiling temperature.

Simultaneous operation of IV, automatic hot water supply and reheating In addition, when the water temperature is low such as in winter or by using multiple taps of the hot water supply, the hot water supply capacity is exceeded and the signal of the hot water supply thermistor 18 becomes lower than the automatic hot water set temperature When the comparator 32 performs a comparison calculation that the deviation is larger than the desired bath boiling temperature, the pump 3 is also rotated to circulate hot water, and the circulating water detecting element 19 is operated to operate the reheating operation control unit 37. The additional heating solenoid valve 15 is also opened to open the additional heating burner.
16 also burns at the same time, is operated by additional heating, automatically supplies hot water to the bathtub 4 while controlling the hot water temperature of the bathtub, and measures the automatic hot water supply amount by the signal of the water supply detecting element 17 to thereby control the hot water supply flow rate control valve 24. By closing the valve at an arbitrary set amount, it is possible to automatically stop hot water supply to the desired bath boiling temperature and stop automatic hot water supply in a short time.

The amount of hot water supplied to the bathtub 4 uses a water amount sensor that counts the amount of water supplied to the water supply detecting element 17, so that the amount of ignition / digested water is detected and the automatic hot water supply amount is controlled by the control circuit 27 during automatic hot water supply operation. The hot water supply flow control valve 24 can be automatically closed by calculating and measuring in the section 38 to stop the automatic hot water supply. The safety valve (vacuum breaker) 29 is provided to prevent backflow into the hot water supply passage due to the rotation of the pump 3 during the additional heating operation.

Next, the automatic hot water supply operation program will be described based on the flowchart of FIG. When the automatic hot water supply operation switch (not shown) is operated, the automatic hot water supply operation program is started. By opening the hot water supply flow rate control valve 24 in step 41, the signal of the water supply detection element 17 is measured in step 42, and when the ignition water amount is detected, the automatic hot water supply operation sequence in step 43 operates and the hot water supply burner 14 operates. It burns and is supplied with hot water automatically. The hot water supply temperature is detected by the hot water supply thermistor 18, and is compared and calculated by the automatic hot water supply hot water temperature setting device 31 'and the comparator 32, and it is determined in step 44 whether or not the hot water supply capacity is equal to or higher than the hot water supply capability.

Normally, it is controlled within the hot water supply capacity range.
46, the hot water supply temperature is controlled to the automatic hot water supply set temperature, and the hot water is automatically supplied. When the automatic hot water supply amount in step 47 reaches the set amount, the hot water supply flow rate control valve 24 is closed in step 48, the automatic hot water supply is stopped, and the hot water is supplied to the bathtub 4 at the desired hot water supply set temperature (bath boiling temperature). No automatic hot water supply operation is completed.

On the other hand, when the water temperature is low such as in winter or when using multiple taps of the hot water supply, the hot water supply temperature is detected by the thermistor 18 for hot water supply, and the automatic hot water supply temperature setter 31 'and the comparator 32 perform a comparison calculation,
If it is determined in step 44 that the capacity is equal to or higher than the hot water supply capacity, the sequence proceeds to the hot water supply / additional heating simultaneous operation sequence in step 49, in which the additional heating burner 16 is also burned at the same time, and hot water is circulated to the bathtub 4 to add the additional heating thermistor 20. Signal in step 50 and 51, the bathtub temperature is controlled while automatically controlling the bathtub temperature so as to reach the bath boiling temperature.

In this case, the set temperature of the bath boiling is set to be equal to the set temperature of the automatic hot water supply hot water temperature setter 31 ', and the signals of the comparators 32 and 36 are controlled by the arithmetic processing unit 33 to operate. .

If the amount of automatic hot water supply reaches the set amount in step 52, step
At 53, the hot water supply flow rate control valve 24 is closed to stop the automatic hot water supply to the bathtub 4 to bring the bathtub hot water temperature to the desired bath boiling temperature.

Effect of the Invention As described above, the present invention is a heat exchanger for heating a hot water circulation passage that is connected to a hot water heat exchanger and a bathtub and circulates hot water with a pump, and a proportional control valve connected in series to the original solenoid valve, Each of the hot water supply burner and the additional heating burner desired for each heat exchanger have a hot water supply solenoid valve and an additional heating solenoid valve branched and connected from the proportional control valve, and the hot water supply thermistor and the additional heat burner. Hot water supply flow rate control valve provided at the entrance of the heat exchanger for heating, a thermistor for additional heating for detecting the circulating hot water temperature, and a hot water supply passage downstream of the hot water supply thermistor and connected to the bathtub And a water supply passage of the hot water supply heat exchanger, which is provided with a water supply detection element for calculating and measuring the amount of water supply, and a control circuit, and during automatic hot water supply operation, the control circuit opens the hot water supply flow rate control valve, The signal of the thermistor for hot water supply is processed The proportional control valve by a control signal
By controlling the combustion amount of the hot water supply burner, the hot water is automatically supplied to the bath so that the temperature of the hot water is adjusted to the desired temperature (the desired bath boiling temperature), and the hot water supply flow control valve is set to an arbitrary value by the signal from the water supply detection element. The valve is closed by a certain amount to stop the automatic hot water supply in the bathtub, and the operation is completed only by the automatic hot water supply operation without the additional heating operation. When the signal of the hot water supply thermistor becomes lower than the automatic hot water supply set temperature and the hot water supply capacity is exceeded, the signal of the control circuit opens the additional heating solenoid valve to burn the additional heating burner at the same time. By configuring the control circuit to automatically supply hot water to the bath while circulating the hot water by circulating the pump as well, the following effects can be obtained.

(1) The hot water temperature can be stabilized because the hot water temperature is controlled by proportionally controlling the combustion amount with one proportional control valve for both hot water supply and additional heating.

(2) Especially, since the bath water temperature can be controlled proportionally,
Energy saving can be achieved compared to the conventional hot water temperature control by Hi-Lo-OFF or ON-OFF control.

(3) Since an automatic hot water supply function can be built into the main unit, it is possible to reduce the cost and make installation free to improve workability, and not to impair the aesthetics of the building.

(4) By using a water amount sensor that counts the amount of water supplied as the water supply detection element, it is possible to set the amount of hot water supplied to the bathtub automatically during automatic hot water supply and automatically stop it. No water level sensor that detects the water level in the bathtub is required other than the sensor that detects the water volume.

(5) Since hot water can be supplied automatically with the lid of the bathtub kept open, there is no need to sprinkle water and energy can be saved, which is economical.

(6) The bath heating time can be completed only by the automatic hot water supply operation without the additional heating operation to the desired bath boiling temperature, and it does not require the additional heating operation after the automatic hot water supply as in the past. It becomes shorter and you can enjoy a comfortable bath life economically.

(7) When the water temperature is low, such as during the winter season, or when the hot water supply is overloaded and the hot water supply thermistor's signal becomes lower than the automatic hot water supply set temperature and the deviation from the desired bath boiling temperature is large. In addition, the pump is also rotated to circulate hot water, the solenoid valve for additional heating is opened by the operation of the circulating water detection element, and the additional heating burner is also burned at the same time, and the additional heating operation is performed to control the hot water temperature of the bathtub to the bathtub. Along with automatic hot water supply, the hot water supply detection element closes the hot water supply flow control valve at an arbitrary set amount, so that the hot water in the bathtub can be automatically stopped and stopped in a short time up to the desired bath boiling temperature. Therefore, the bath boiling time will be shorter, and you will be able to enjoy a comfortable and economical bath life.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a water heater with a reheating function showing an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a control circuit, FIG. 3 is a flowchart of an automatic hot water supply operation program, and FIG. It is a schematic configuration diagram of an example. 1 ... Heat exchanger for hot water supply, 2 ... Heat exchanger for additional heating, 3 ...
Pump, 4 ... Bathtub, 11 ... Original solenoid valve, 12 ... Hot water solenoid valve, 13 ... Proportional control valve, 14 ... Hot water burner, 15 ...
Solenoid valve for reheating, 16 ... Burner for reheating, 17 ... Water supply detecting element, 18 ... Hot water supply thermistor, 19 ... Circulating water detecting element,
20 …… additional heating thermistor, 24 …… hot water supply flow control valve, 27…
… Control circuit (control section), 30… Bathtub automatic hot water supply passage.

Claims (1)

[Claims] 1. A heat exchanger for reheating a hot water circulation passage, which is connected to a heat exchanger for hot water supply and a bath and circulates hot water by a pump, a proportional control valve connected in series with an original solenoid valve, and each of the heat exchangers. A hot water supply solenoid valve and an additional heating solenoid valve branched and connected from the proportional control valve to each of the desired hot water supply burner and additional heating burner, and a hot water supply heat exchanger provided at the outlet of the hot water supply heat exchanger. A hot water thermistor for detecting the hot water temperature and an additional heat thermistor for detecting the circulating hot water provided at the entrance of the heat exchanger for additional heating,
A hot water supply flow rate control valve provided in a hot water supply passage for a bathtub that branches from a hot water supply passage downstream of the hot water supply thermistor and connected to a bathtub, and a water supply detection for calculating and measuring the amount of water supply provided in the water supply passage of the hot water supply heat exchanger An element and a control circuit, the control circuit opens the hot water supply flow rate control valve during an automatic hot water supply operation, and operates the proportional control valve according to a control signal arithmetically processed by the signal of the hot water supply thermistor, Control the combustion amount of the hot water supply burner to automatically supply hot water to the bathtub to reach the desired hot water temperature (desired bath boiling temperature), and set the hot water supply flow control valve to an arbitrary set amount by the signal from the water supply detection element. To stop the automatic hot water supply in the bathtub and complete the operation only with the automatic hot water supply without additional heating, and
When the bath water temperature is low during the automatic hot water supply, such as during winter, or when the hot water supply plug is used, the signal from the hot water supply thermistor becomes lower than the automatic hot water supply set temperature. Hot water supply with a heating function, in which the control circuit is configured so that the heating solenoid valve is opened to burn the heating burner at the same time and the pump is also rotated to circulate hot water to automatically supply hot water to the bathtub. Machine.