JPH01222159A - Automatic hot-water supplier - Google Patents

Abstract

PURPOSE:To permit bathing hot-water to be heated to a set temperature and kept in the same temperature, by a method wherein the title hot-water supplier is equipped with a circulat ing pump ON-delay timer, operating a circulating pump continuously without effecting proper temperature control until a set time has elapsed after putting the circulating pump ON in heat-up and temperature keeping operation. CONSTITUTION:When a solenoid valve 22 is closed and a circulating pump 18 is put ON, heat-up and temperature keeping operation is started and bathing hot-water is circulated in a circulating flow passage B. Upon the initial period of starting of the driving of the circulating pump 18, the circulating pump 18 is operated continuously without effecting a proper temperature control until a set time (60sec, for example) has elapsed regardless whether the value Tm2 of a measured bathing hot-water temperature, measured by a bathing hot-water temperature sensor 29, is higher or lower than the value Ts3 of a set heat-up and temperature keeping temperature. When high-temperature hot-water, flowing into a bathtub 16 through an inflow port 16a, flows out of an outflow port 16b into a return side pipeline 19 and the value Tm2 of high-temperature bathing hot-water temperature is detected by mistake, the circulating pump 18 is operated continuously and the proper temperature control is effected when the circulating hot-water becomes to have an uniform temperature at first whereby the bathing hot-water may be heated up and the temperature thereof may be kept at the set hot-water temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field The present invention relates to a one-can, two-channel type automatic water heater in which the same water heater is connected to a bathtub through a circulation channel and a hot water filling channel.

(b) Prior Art Conventionally, as one type of automatic water heater, there is the above-mentioned one-can, two-channel automatic water heater.

In such an automatic water heater, a heat exchanger in the water heater main body is connected to the bathtub through outgoing piping and incoming piping to form a circulation flow path, and the circulation flow path is placed midway through the outgoing piping. A pump is provided, and one end of the separately provided hot water filling piping is connected to the heat exchanger, and the other end is connected to the part of the outgoing piping below the circulation pump via a solenoid valve and a hopper, Furthermore, a mixing valve is provided in the middle of the hot water filling piping, and a hot water filling path of a natural flow type is provided separately in addition to the circulation path.

In addition, with this configuration, hot water filling work, boiling,
Heat insulation work etc. can be performed in the following manner.

In other words, hot water filling work involves stopping the circulation pump, switching the flow path from the circulation flow path to the hot water filling flow path, and using the high-temperature water generated in the water heater itself using its own pressure (tap water pressure). The water is fed to the mixing valve to mix the water and provide suitable temperature water (
(e.g. 38℃) and supply the appropriate amount of hot water to the hot water piping.
This is done by discharging hot water into the bathtub by gravity through a hopper and the downstream side of the outgoing hot water supply pipe. and,
The water level switch operates, stops the solenoid valve, and stops dispensing hot water, completing the task of filling the set amount of hot water.

After that, boiling and keeping warm will be carried out,
This work is done by driving a circulation pump installed upstream of the outgoing piping to discharge high-temperature hot water that has been heat exchanged in the water heater body through the outgoing piping into the bathtub, and to transfer the hot water in the bathtub to the incoming piping. This is done by forming a circulation flow by returning the water to the heat exchanger through the bathtub and raising the temperature of the bath water in the bathtub to the set temperature. When the set temperature is reached, the circulation pump is automatically stopped and circulation is stopped, completing the boiling and warming work.

(c) Problems to be Solved by the Invention However, such conventional automatic water heaters still have the following problems.

In other words, at the beginning of boiling/warming operation after hot water filling operation, if the high-temperature water that flows into the bathtub through the inlet flows into the return side piping from the outlet through a short circuit, the bath water temperature will change. The sensor erroneously detects a high temperature value of the bath water instead of the original temperature of the water in the bathtub, and then the circulation pump is stopped to complete the boiling and warming operation.

In other words, the boiling and warming operation ends before the water temperature in the bathtub reaches the set temperature, making the user feel uncomfortable while taking a bath. In addition, after taking a bath, you have to boil the water again and keep it warm.
This also means that you will not be able to enjoy a comfortable bath.

An object of the present invention is to provide an automatic water heater that can solve the above problems.

(d) Means for solving the problem The present invention connects the heat exchanger and the bathtub in communication with an outgoing piping and an incoming piping with a circulation pump interposed in the middle to form a circulation flow path, In a one-can, two-channel type automatic water heater, in which a hot water filling pipe for supplying mixed hot water for filling hot water is branched and connected to an outgoing piping on the downstream side of the circulation pump to form a hot water filling flow path,・During heat retention operation, after the circulation pump is turned on, until the set time has elapsed, the temperature will be controlled at an appropriate temperature regardless of whether the bath water temperature measured by the bath water temperature sensor is higher or lower than the boiling heat retention setting temperature value. The present invention relates to an automatic water heater characterized in that it is equipped with a circulation pump on-delay timer that allows the circulation pump to be operated continuously without having to do so.

(e) Action and effect With the above configuration, the present invention has the following effects.

That is, in the present invention, at the beginning of boiling/warming operation,
If the hot water that flows into the bathtub through the inlet flows into the return piping from the outlet due to a short circuit, the circulation pump will be stopped even if the high temperature value of the bath water is incorrectly detected. Since the proper temperature control can be performed only after the circulating bath water reaches a uniform temperature by continuous operation without heating, the bath water can be boiled and kept warm at the set water temperature.

(f) Examples The present invention will be specifically described below based on examples shown in the attached drawings.

FIG. 1 shows the conceptual overall configuration of an automatic water heater A according to the present invention, and in the figure, IO is the main body of the water heater, which is equipped with a heat exchanger 11 and an oil burner 12.

A water supply pipe 13 and a hot water supply pipe 14 are respectively connected to the heat exchanger 11, and tap water is supplied into the outer can 11b of the heat exchanger 11 through the water supply pipe 13, while the hot water supply pipe 14
Through this, hot water will be delivered to a sink, shower, etc. (not shown).

In FIG. 1, reference numeral 15 has a starting end connected to the inner pipe 11a of the heat exchanger 11, a terminal end connected to the bathtub 16, and a water level sensor 17 and a circulation pump 1 in the middle thereof.
Reference numeral 8 denotes an outbound piping, and 19 denotes a return piping whose starting end is connected to the bathtub 16 and whose terminal end is connected to the inner pipe 11a of the heat exchanger 11.

With this configuration, the heat exchanger 11-outgoing pipe 15-
A circulation path B can be formed from the bathtub 16, the return pipe 19, and the heat exchanger 11, and by driving the circulation pump 18, the bath water in the bathtub 16 can be circulated in the circulation path B. , the bath water can be continuously heated by the heat exchanger 11 to boil it up and keep it warm.

Further, in FIG. 1, 20 is a hot water filling pipe whose starting end is branched from the hot water supply pipe 14, and the terminal end of the hot water filling pipe 20 is connected to a mixing pulp 21, a solenoid valve 22, a nozzle 23
It is connected to the downstream side of the outgoing pipe 15 through the hopper 24 and the hopper 24 .

With this configuration, by connecting the terminal end of the hot water filling pipe 20 and the downstream side of the outgoing pipe 15, when the ii pump 18 is stopped, the heat exchanger 11 - mixing pulp 21 - solenoid valve 22 - nozzle 23 - Hopper 2
4 - Outbound piping 15 - Bathtub 16 can form a natural hot water filling channel C using only water pressure.

Note that from the outer can 11b of the heat exchanger 11, there is a hot water filling channel C.
A large amount of hot water flowing through the heat exchanger 11 can be supplied in a short time because the heat exchange capacity in the heat exchanger 11 is large.On the other hand, the heat exchange capacity of the inner pipe 11a of the heat exchanger 11 is small.

Note that 26 is a branch water supply pipe provided between the mixing pulp 21 and the water supply pipe 13 in order to supply water to the mixing valve 21.

With this configuration, if the oil burner 12 of the water heater body 10 is driven with the circulation pump 18 stopped and the mixing pulp 21 and the solenoid valve 22 are opened, the high temperature hot water from the heat exchanger 11 is retained. The high-temperature hot water is fed to the mixing pulp 21 by water pressure, and in the mixing valve 21, the hot water is mixed with water that is also fed by water pressure through the branch water supply piping 26 to generate mixed hot water at an appropriate temperature. For mixed hot water, hot water filled piping 20
, the hot water is discharged into the bathtub 16 by gravity through the electromagnetic valve 22, the nozzle 23, the hopper 24, and the outgoing pipe 15.

Further, to explain other configurations in the illustrated embodiment, SP is a fuel supply pump that supplies fuel to the oil burner 12, and 27 is a pump that prevents polluted water from bathing water after use from mixing with tap water. pressure switch for, 28
is a vacuum breaker.

Moreover, 20a is an overflow pipe connected to the upper part of the hopper 24 in communication. Reference numeral 29 denotes a bath water temperature sensor provided on the return side pipe 19 of the circulation flow path B, which measures the temperature of the bath water in the bathtub 16. On the other hand, 30 is the main body of the water heater
A hot water supply temperature sensor disposed in the heat exchanger 11 of O.
It measures the temperature of high-temperature hot water generated in the heat exchanger 11, and 30a is a bimetal for preventing overheating of the can of the water heater main body 10.

Furthermore, in FIG. 1, 31 is a control device, and the control device 31, as shown in FIG. 1, includes a microprocessor MPU, human output interfaces 32 and 33,
It is composed of a memory 34 consisting of a ROM and an RAI'l.

In the above configuration, the input interface 32
The water level sensor 17. A bath water temperature sensor 29, a hot water supply temperature sensor 30, and a bimetal 30a are connected.

On the other hand, the output interface 33 includes the circulation pump 18
．． Mixing pulp 21. A solenoid valve 22 and a fuel supply pump SP are connected.

The memory 34 also stores information about the circulation pump based on output signals from the water level sensor 17, bath water temperature sensor 29, hot water supply temperature sensor 30, bimetal 30a, etc., as well as drive signals from various controllers 35 and 36, which will be described later. 18
．． A driving order program for driving the mixing pulp 21, solenoid valve 22, and fuel supply pump SP is stored, and as described later, when there is an interrupt operation in the middle of the main routine, the operating condition immediately before that program is stored. It is possible to record the hot water tap conditions.

Next, the controllers 35 and 36 for manually sending drive output to the control device 31 will be explained.

In Figure 3, a main controller 35 is installed in a kitchen or the like, and is a controller that specifically instructs conditions for dispensing hot water to the bathtub 16.
This is a controller installed near the bathtub 16 to instruct simple hot water supply conditions to the bathtub 6.

By operating these controllers 35 and 36, predetermined drive signals or control signals are sent to the control device 31, and the circulation pump 1 is controlled based on the drive signals.
8. The mixing valve 21, the solenoid valve 22, the oil burner 12 (including the fuel supply pump SP), etc. can be driven.

A specific configuration of the main controller 35 and sub-controller 36 shown in FIGS. 2 and 3 is shown.

In this embodiment, the main controller 35 includes, as shown in FIG. 2, an operation switch 40, a hot water filling switch 41, a boiling/keeping warm switch 42, a hot water filling reservation switch 43, and a freezing prevention switch 44. It is equipped with a child lock switch 45.

When the operation switch 40 is turned on, all the controllers 35, 36, the control device 31, the circulation pump 18. Various driving devices such as the mixing valve 21, solenoid valve 22, and fuel supply pump SP, and the water level sensor 17° Bath water temperature sensor 29, hot water supply temperature sensor 30, and bimetal 3
Power can be supplied to various sensors such as 0a.

In addition, 40a and 46m are operation display lamps that light up when the operation switch 40 is turned on, 41a+47a are hot water filling display lamps, 42a and 48a are boiling and keeping warm display lamps, 43f are hot water filling reservation display lamps, 44a and 49a
is a freeze prevention indicator lamp, 45a is a child lock indicator lamp, and 50a is a catch-up indicator lamp.

When the hot water filling switch 41 is turned on, it sends a drive signal to the control bag rI 131, and based on the drive order program read from the memory 34, the circulation pump 18.
Mixing valve 21, solenoid valve 22 and oil burner 1
2 (including the fuel supply pump SP), etc., to automatically fill the water, boil the water, and keep the water warm.

In addition, among the hot water supply conditions, the hot water filling temperature (e.g. 38℃)
The amount of hot water (for example, 20Of) is set in advance by the control device 31.
is set by the manufacturer.

However, the hot water filling temperature and hot water filling amount will be determined at a later date.
The settings can also be changed by the manufacturer or user.

In this embodiment, when the hot water filling switch 41 is turned on, hot water filling work is automatically performed, but furthermore,
After the hot water filling work is completed, the sub controller 36 (described later)
The boiling/warming operation automatically shifts to the temperature set by the temperature setting switches 52 and 53, and once this is completed, the boiling/warming indicator lamp 42a, which was lit at the same time as the hot water filling switch 41 was turned on, goes out.

Furthermore, when the boiling and warming work is completed, the bathing OK lamp 42b lights up and the bathing OK buzzer sounds.

The boiling/warming switch 42 is used to automatically raise the bathwater temperature to the set bathwater temperature after the water filling/boiling/warming operation is completed, for example, when the bathwater temperature drops during bathing. By turning on the switch 42, the boiling and warming operations described above will be performed again.

By turning on the hot water filling reservation switch 43,
The above-mentioned hot water filling work and boiling/warming work can be performed at any time. The reserved time can be set by pressing the reserved time setting switches 438 to 43d, and the set reserved time is displayed on the digital display 43e.

By turning on the freeze prevention switch 44, the bath water in the heat exchanger 11 is heated to a temperature sufficient to prevent freezing, for example, about t.
o'c, and the freeze prevention indicator lamp 44
A will light up.

In order to prevent the bath water in the circulation channel B from freezing, when the bath water becomes lower than a preset freezing prevention temperature, the circulation pump 18 is automatically turned on and the bath water in the circulation channel B is circulated. I will do it at least.

In addition, the child lock switch 45 disables the sub-controller 36 from changing the hot water supply conditions by turning on the child lock switch 45, and ensures safety by preventing the hot water supply conditions from being changed by a child or the like. However, if the child lock switch 45 is pressed again, the child lock will be released.

In addition, the sub-controller 36 installed in the bathroom is shown in Figure 3.
The specific configuration of the same boiler controller 36 includes an operation switch 46 and a hot water filling switch 4.
7, a boiling/warming switch 48, a freeze prevention switch 49, a reheating switch 50, and bathtub temperature setting switches 52 and 53.

In this configuration, the operation switch 46, the hot water filling switch 47, the boiling/warming switch 48, and the freeze prevention switch 49 are connected to the main controller 3 described above.
5, the operation switch 40 and the hot water filling switch 4
1, the boiling/warming switch 42, and the freeze prevention switch 44 have similar functions, so a description of these functions will be omitted, and the functions of the other switches will be described below.

That is, the temperature setting switch 52 changes the set bath water temperature (for example, 38°C) set by the control device 31 to 1°C or 2°C.
The temperature setting switch 53 can adjust the set bath water temperature to the lower temperature side by 1°C or 2°C. And the temperature setting button 52.5
After setting in step 3, by turning on the hot water filling switch 47, hot water filling, boiling, and warming operations will be automatically performed. Furthermore, after a certain period of time has elapsed after the automatic hot water filling, boiling, and keeping warm operation is completed, by turning on the boiling/keeping switch 48, the water can be heated to a set temperature and kept warm.

Next, by turning on the chasing switch 50, regardless of whether or not the bath water temperature has reached the temperature set in advance by operating the temperature setting switch 52, 53.
The circulation pump 18 is driven to discharge and circulate the hot water heat-exchanged by the heat exchanger 11 into the bathtub 16 through the circulation flow path B.
, which can be raised to the desired temperature.

Further, 57 is a transition state display section for displaying the transition state of the hot water supply operation, and as the hot water supply operation transitions, the hot water filling indicator lamp 57a and the boiling water indicator lamp 57b are sequentially displayed.
The old indicator lamp 57c that lights up is a combustion indicator lamp, which lights up during the hot water supply combustion operation.

It should be noted that the sub-controller 36 can be installed somewhere other than near the bathtub.

The operation of supplying hot water to the bathtub 16 by the automatic water heater A having the above configuration will be described below.

Note that hot water supply operation generally consists of hot water supply combustion operation, hot water filling operation, boiling/warming operation, reheating operation, and freezing prevention operation, but in this example, the gist of the present invention is to operate the water level switch. Only the hot water filling operation, which includes the operation of automatically closing the solenoid valve even in the event of a failure, and the subsequent boiling and warming operation will be explained.

[Hot water filling work]

Figure 4 shows the sequence of hot water filling operation.

First, the hot water filling switch 41 of the main controller 35
Alternatively, turn on the hot water filling switch 47 of the sub-controller 36 (120).

When the hot water temperature value Tal measured by the hot water temperature sensor 30 installed in the heat exchanger HI3 of the water heater body 10 is higher than or equal to the bath operation possible temperature value Tsl set in the control device 31 (121Y), and When the water level sensor 17 is off (122Y), the solenoid valve 22 is turned on and opened (122Y).
23).

As a result, the hot water filling pipe 20. mixing pulp 21
．． Solenoid valve 22. Mixed hot water flows into the bathtub 16 by gravity through the nozzle 23, hopper 24, hot water filling pipe 20, and outgoing pipe 15.

In addition, here, the bath operation possible temperature value Ts! is a value preset in the control device 31, and the mixing valve 21
It is a value that can be mixed with water from the branch water supply pipe 26 to obtain a predetermined boiling heat retention set temperature value Ts3 (for example, 38'C); for example, the boiling heat retention set temperature value T
It can be set at a temperature value of 40°C, which is slightly higher than s3.

However, if the amount of water supplied from the branch water supply pipe 26 is initially set to zero, the bath operation possible temperature value Ts can also be made equal to the boiling heat retention setting temperature value Ts3.

On the other hand, if the measured hot water temperature value Ta+ does not reach the bath operation possible temperature value Tsz (121N), the solenoid valve 22
does not operate and does not start filling with hot water.

The reason for arranging the sequence in this way is as follows.

That is, at the beginning of the operation of the water heater main body 10, only hot water at a low temperature can be generated, and this water is supplied to the bathtub 1 through the hot water filling channel C.
6, the set bath water temperature cannot be secured even if the set amount of bath water is dispensed into the bathtub 16, and therefore,
After that, it will take time to boil the water and keep it warm.

Therefore, by making it possible to discharge hot water into the bathtub 16 through the hot water filling channel C in advance after the hot water supply temperature in the heat exchanger 11 reaches the bath operation possible temperature value Ts at the hot water supply measurement temperature value Tm1, the hot water can be discharged into the bathtub 16 through the hot water filling channel C in advance. This made it possible to fill, boil, and keep warm water.

Then, when the mixed dry water at the set flow rate flows into the bathtub 16, the water level sensor 17 is turned on (124Y)L, and after that, the water level sensor on detection time (for example, 0.55 eC) set by the water level sensor on detection timer has elapsed. Later (125Y), the solenoid valve 22 is turned off and closed (
12(i) Complete the hot water filling operation.

In addition, in the above sequence, the reason why the water level sensor on detection time is provided is to prevent false detection.

In other words, during hot water filling operation, even though the set amount of hot water is not reached, the water level sensor 1 may be damaged due to splashing water or waves in the bathtub.
Even if 7 is turned on, the solenoid valve 22 does not close immediately.
Since it will not close until the time set by the water level sensor on detection timer has elapsed, malfunctions can be prevented, and the set amount of hot water can be dispensed into the bathtub accurately, freeing the user from troublesome operations such as refilling. You can enjoy a comfortable bath.

Thereafter, when the electromagnetic valve 22 is closed (126), the circulation pump 18 is turned on (127), and the boiling/warming operation is started to circulate the bath water in the circulation channel B.

When the circulation pump 18 starts operating, the bath water measurement temperature value T+sx measured by the bath water temperature sensor 29 is higher than the boiling heat retention setting temperature value Ts3 until a set time (for example, 60 seconds) has elapsed. Regardless of whether it is low or not, the appropriate temperature control it (Tag.

The circulation pump 18 can be operated continuously without performing on/off control of the circulation pump 18 based on the comparison value with Tsl (128).

As a result, at the beginning of the boiling/warming operation, the high temperature water flowing into the bathtub 16 through the inlet 16a is caused by a short circuit from the outlet 16b to the return side piping 19.
Even if the high-temperature bath water temperature value Ts+1 is mistakenly detected when the bath water flows out into the bath water, it is possible to continuously operate the circulation pump 18 and perform appropriate temperature control only after the circulating bath water reaches a uniform temperature. As will be described later, bath water can be boiled and kept warm at a set water temperature.

Furthermore, the hot water filling resequence in this embodiment is also characterized by the following configuration.

That is, in this embodiment, the heat exchanger 1 of the water heater main body lO
Even if the water supply temperature value Tml measured by the hot water supply temperature sensor 30 installed in the controller 1 is higher than the bath operation possible temperature value Ts set in the control device 31 (121Y), the water level sensor 17 is on. (122N) determines that the bath water from the previous day remains in the bathtub 16 in an amount greater than the set amount of hot water, or that the set amount of hot water has already been filled, and directly drives the circulation pump 18 without performing hot water filling operation. Then, start boiling and warming operation (122N).

Thereby, overflow from the bathtub 16 can be prevented.

Further, in this embodiment, when the solenoid valve 22 is opened (1
23) The solenoid valve on integration timer operates and solenoid valve 2
129) and close the solenoid valve 22 after a predetermined time (for example, 90 minutes) has elapsed (13).
0) and lights up a warning lamp (not shown) (1
31).

This is to prevent the solenoid valve 22 and circulation pump 18 from remaining on indefinitely due to a malfunction of the water level sensor 17, a malfunction of the provided piping 20, or a forgetting to close the drain plug of the bathtub 16. This is to stop the hot water filling operation.

[Boiling/warming operation]

The boiling/warming operation is performed according to the sequence shown in FIG.

As shown in Fig. 5, in normal operation, after the hot water filling operation shown in Fig. 4 is completed, the boiling and warming operation is automatically performed (at the end of the routine in Fig. Connection step in mid-interrupt (■).

That is, the bath water is circulated in the circulation flow path B, and the bath water temperature sensor 2
The bath water measurement temperature value Tag detected by 9 becomes equal to or higher than the boiling heat retention set temperature value Ts3 set by the bathtub temperature adjustment switch 52-53 of the sub-controller 36 (140Y), and the boiling detection timer After the set time (for example, 5 seconds) has elapsed (141Y), the boiling is completed and the circulation pump 1 is turned off.
8 stops, and the hot water filling lamp 47 is turned off (142).

In addition, the measured bath water temperature value TIl! If it is lower than the boiling heat retention set temperature value Ts:l, continue to measure the temperature continuously or periodically until the bath water measurement temperature value T■2 becomes equal to or higher than the boiling heat retention set temperature value Ts3. Wi Kansui Pump 18 is operated continuously (14 ON).

Thereafter, it is determined whether or not the first boil has occurred, and if it is the first boil (143Y), the notification buzzer turns on (143A).

With this, it is possible to prevent the buzzer from sounding every time the boiling/warming operation is performed and causing discomfort to the user.

Then, normally, the boiling operation is automatically shifted to the warming operation (144Y).

Along with this transition, the lamp 42b lights up at bath 0 on the main controller 35 (145).

When the bathing OK clamp 2b lights up, the heat retention timer is activated (145A), and the bathwater temperature sensor 29 is made to measure the bathwater temperature at fixed time intervals (for example, 15 minutes) (146).
If the bath water measured temperature value Ts+ is lower than the bath water set temperature value ↑S, turn off the bathing OK clamp 2b and (
147), the circulation pump 18 is activated for a predetermined period of time (for example, 5 seconds) (148), and then unless the boiling/warming switch 42 or 48 is pressed again (149N).
, or unless the heat retention operation continuation time (e.g. 4 hours) counted by the heat retention continuous operation timer integrated from the first boil notification buzzer (143A) has elapsed (15O
N), return to step (140) and repeat boiling/warming operation (140) to (147).

On the other hand, in the bath water temperature measurement based on the operation of the heat retention timer, if the bath water measurement temperature value Tag is higher than the boiling heat retention set temperature value Ts+ (146Y), the lamp 42b is kept in the ON state at bathing 0.

In addition, when the boiling/warming switch 42 or 48 is turned on artificially (149Y) (144N), or when the warming operation continuation time has elapsed (15ON), the boiling/warming lamp 48a is turned off ( 151).

In addition, the reason why the keep-warm operation continuation time is measured by the keep-warm timer and the keep-warm operation is canceled when the time has elapsed is because the user forgets to turn off the boil-up/keep-warm switch 42 or 48. It is designed to automatically cancel even if the

Furthermore, in the above routine, the case where the heat retention operation is not performed (144N) refers to the case where the heat retention operation is not performed (144N) when it is artificially turned off or the addition water operation is performed by turning on the addition water switch 51, and in this case, the heat retention operation is performed. Therefore, the boiling operation ends.

In addition, in normal hot water supply operation, as mentioned above, after the hot water filling operation is completed, the boiling/warming operation is automatically performed (at the final end of the routine in Figure 4 and at the midway interrupt in Figure 5). In the connection step (■), the boiling and warming operations can be performed separately and independently from the hot water filling operation.

In this case, instead of hot water filling operation, steps (152) to (155) of the sequence shown in FIG. 5 are performed.

That is, first, the boiling/warming switch 42 of the main controller 35 or the boiling/warming switch 48 of the sub-controller 36 is turned on (152).

If the hot water temperature value Ta+1 measured by the hot water temperature sensor 30 installed in the heat exchanger ll of the water heater main body 10 is higher than the boiling operation possible temperature value Ts4 set in the control II device 31 (153Y), the circulation pump 18 is on 15
4) High-temperature water flows from the heat exchanger 11 into the bathtub 16 through the circulation channel B in a V&circular manner, gradually increasing the temperature of the bathwater.

However, if the measured hot water temperature value Tm does not reach the boiling operation possible temperature value Ts4 (153N), the circulation pump 18 is not turned on.

Note that here, the boiling operation possible temperature value Ts4 is a value preset in the control device 31, and is a temperature considerably higher than the predetermined boiling heat retention setting temperature value Ts (for example, 38°C), for example, 50°C. It can be set to °C.

The reason for arranging the sequence in this way is as follows.

That is, at the beginning of the boiling operation of the water heater main body 10, only hot water at a low temperature can be generated, and this water is passed through the circulation path B to the bathtub 1.
6, even if the set amount of bath water is dispensed into the bathtub 16, it will take too long to secure the set bath water temperature. By allowing hot water to be discharged into the bathtub 16 through the circulation flow path B after the measured hot water temperature value Tm1 reaches Ts4, it is possible to obtain the set bath water temperature in a minimum time.

Then, the circulation pump 18 is turned on (154), and after the pump initial time set by the pump initial timer has elapsed (155Y), step (154) is started.
40) to perform appropriate temperature control.

That is, until the pump initial time has elapsed, the appropriate temperature control (140) is not performed, and the output detected by the bath water temperature sensor 29 is ignored by the control device 31.

This was done for the following reasons. Return side piping 1
While bathtub 9 is heated by the setting sun, bathtub 16
Even if the circulation pump 18 is turned on, such as when the
Although the actual temperature of the bath water in the bathtub 16 is low, the bath water temperature sensor 29 detects the hot bath water temperature in the return pipe 19 and sends an erroneous detection output to the control device 31. Therefore, in order to prevent false detection due to such piping conditions, etc., the detection outputs of the bath water temperature sensor 29 etc. are ignored until the bath water temperature becomes uniform in the circulation flow path B, and then the temperature is controlled appropriately based on the detection output. I (140) to enable accurate control.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram illustrating the configuration of an automatic water heater according to the present invention;
FIG. 2 is an explanatory diagram of the configuration of the main controller, FIG. 3 is an explanatory diagram of the configuration of the sub-controller, FIG. 4 is a flowchart of hot water filling operation, and FIG. 5 is a flowchart of boiling/warming operation. In the figure, A: Automatic water heater B: Circulation flow path C: Hot water filling flow path 11: Heat exchanger 15: Outbound side piping 16: Bathtub 18: Circulation pump 19: Return side piping 20: Hot water filling piping 22: Solenoid valve 29: Bath water temperature sensor

Claims (1)

[Claims] 1. The heat exchanger (11) and the bathtub (16) are connected to each other by an outgoing pipe (15) and a returning pipe (19) with a circulation pump (18) interposed in the middle. to form a circulation flow path (B),
Hot water filling piping (20) that supplies mixed hot water for hot water filling to the outgoing piping (15) on the downstream side of the circulation pump (18)
In a one-can, two-channel type automatic water heater in which the hot water is connected in branches to form a hot water filling channel (C), during boiling and heat retention operation, after the circulation pump (18) is turned on, the preset time is Until the time has passed, the bath water temperature value Tm_2 measured by the bath water temperature sensor (29)
Automatic hot water supply characterized by being equipped with a circulation pump on-delay timer that can operate the circulation pump (18) continuously without performing appropriate temperature control regardless of whether the temperature is higher or lower than the set temperature value Ts_3. Machine.