JP2023060741A - Instantaneous hot water supply device - Google Patents

Abstract

To provide an instantaneous hot water supply device capable of suppressing a heating energy loss while avoiding giving users discomfort feeling.SOLUTION: An instantaneous hot water supply device is provided with a time zone setting portion T, which sets a high frequency time zone in which a hot water supply frequency of a hot water supply state in which a hot water supply tap 1 is opened is high in one day, and a low frequency of time zone in which the hot water supply frequency is low. An operation control portion C, in the high frequency time zone, executes instantaneous hot water heating, when a detection temperature before heating detected by a hot water temperature detection sensor M while stopping the heating actuation of the instantaneous hot water heating portion K is lower than a reference heating starting temperature set to be lower than a set target temperature, and in the low frequency time zone, executes the instantaneous hot water heating, when the detection temperature before heating is lower than a low frequency heating starting temperature lower than the reference heating starting temperature.SELECTED DRAWING: Figure 1

Description

The present invention comprises a hot water supply heating unit for heating hot water from a water supply passage and supplying hot water to the hot water supply passage, a hot water supply valve connected to the hot water supply passage, and at least a hot water supply valve side portion of the hot water supply passage. An instant hot water circulation circuit and an operation control unit are provided,
The hot water circulation circuit is provided with a circulation pump, a hot water heating unit, and a hot water temperature detection sensor,
When the pre-heating detection temperature detected by the hot water temperature detection sensor in a state where the operation control unit stops the heating operation of the hot water heating unit is lower than the set heating start temperature which is lower than the set target temperature, While the circulation pump is in operation, the hot water heater is operated to heat the hot water in the hot water circulation circuit to the set target temperature based on the information detected by the hot water temperature detection sensor. The present invention relates to a hot water heater that performs heat treatment for hot water.

Such an instant hot water type hot water supply apparatus heats the hot water in the instant hot water circulation circuit to a set target temperature, so that when the hot water heating unit and the hot water tap are far apart, that is, the hot water heating unit and the hot water supply Even when the distance from the tap is large, high-temperature hot water can be supplied when the hot water tap is opened (see, for example, Patent Document 1).

Patent Document 1 describes a case where the set temperature of hot water discharged from the hot water tap is set as the set target temperature. A high temperature (for example, 60° C.) may be applied as the set target temperature, for example, in the case where a mixing faucet that discharges hot water at a target temperature is used.

Further, in Patent Document 1, a configuration is described in which the instant hot water heating unit also serves as the hot water heating unit. There are cases where a liquid-liquid heat exchanger that exchanges heat with is applied (for example, see Patent Document 2), and an electric heater is sometimes applied as a heating unit for hot water (for example, Patent Document 3 reference).

Further, as a form in which the operation control unit executes the instant hot water heating process, as described in Patent Document 1, the operation control unit stops the heating operation of the instant hot water heating unit and stops the circulation pump. When the pre-heating detection temperature detected by the hot water temperature detection sensor becomes lower than the set heating start temperature while the hot water temperature is being maintained, there is a mode in which the instant hot water heating process is executed.
In addition, when the operation control unit operates the circulation pump with the heating operation of the hot water heating unit stopped every time the set time interval elapses, the pre-heating detected by the hot water temperature detection sensor When the detected temperature becomes lower than the set heating start temperature, there is a mode in which the instant hot water heating process is executed.

JP-A-7-269949 Japanese Patent Application Laid-Open No. 2001-193955 JP-A-2000-18623

In a day, there are high-frequency time periods in which the hot water tap is opened and the hot water is discharged, and low-frequency time periods in which the hot water tap is opened and the hot water is discharged (for example, when hot water is discharged). There is a time period when there is no
Conventionally, in both the high frequency time period and the low frequency time period, when the pre-heating detection temperature detected by the hot water temperature detection sensor falls below the set heating start temperature which is lower than the set target temperature, the instant hot water heating is performed. Since processing is performed, there is a disadvantage of loss of heating energy, and improvement is desired.

In other words, in the high-frequency period, the temperature of the hot water in the instant hot water circulation circuit is accurately kept close to the set target temperature, so that hot water at the set target temperature is supplied as much as possible from the start of hot water delivery. , it is desirable to appropriately improve the user's usability.
However, in a low-frequency time zone (for example, a time zone in which hot water is never discharged), the user's feeling of use is improved even if the temperature of the hot water in the hot water circulation circuit is not brought close to the set target temperature. However, conventionally, the temperature of the hot water in the hot water circulation circuit is accurately brought close to the set target temperature during the low frequency time period as well as the high frequency time period. Since this is executed, there is a disadvantage of loss of heating energy.

However, if the heat treatment for instant hot water is completely stopped during the low-frequency time period, cold hot water at room temperature will be supplied for a long time from the start of hot water supply when there is hot water supply during the low-frequency time period. Since it becomes a thing and gives discomfort to the user, it is necessary to execute the heat treatment for instant hot water even in the low frequency time period.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its object is to provide a hot water supply apparatus capable of suppressing the loss of heating energy while avoiding discomfort to the user. It is in.

The instant hot water supply apparatus of the present invention includes: a hot water supply heating unit for heating hot water from a water supply passage and supplying hot water to the hot water supply passage; a hot water supply valve connected to the hot water supply passage; and at least a hot water supply valve side portion of the hot water supply passage. An immediate hot water circulation circuit and an operation control unit are provided,
The hot water circulation circuit is provided with a circulation pump, a hot water heating unit, and a hot water temperature detection sensor,
When the pre-heating detection temperature detected by the hot water temperature detection sensor in a state where the operation control unit stops the heating operation of the hot water heating unit is lower than the set heating start temperature which is lower than the set target temperature, While the circulation pump is in operation, the hot water heater is operated to heat the hot water in the hot water circulation circuit to the set target temperature based on the information detected by the hot water temperature detection sensor. A heat treatment for instant hot water is performed, and its characteristic configuration is as follows:
a time period setting unit for setting hot water supply frequency corresponding time periods including a high frequency time period in which the hot water supply tap is opened to supply hot water in a day and a low frequency time period in which the hot water supply frequency is low; provided,
The operation control unit sets the set heating start temperature to a reference heating start temperature in the high frequency time period, and sets the set heating start temperature to the reference heating start temperature in the low frequency time period. The point is that the heating start temperature is set to a lower low-frequency heating start temperature.

That is, in a high-frequency time period during which hot water is supplied frequently in a day, when the pre-heating detection temperature detected by the hot water temperature detection sensor is lower than the reference heating start temperature set lower than the set target temperature. , heat treatment for instant hot water is executed.
On the other hand, in the low-frequency time period during which hot water supply frequency is low, the pre-heating detection temperature detected by the hot water temperature detection sensor is higher than the low-frequency heating start temperature which is lower than the reference heating start temperature. If it is low, heat treatment for instant hot water is performed.

In other words, the temperature of the hot water in the hot water circulation circuit, after being heated to the set target temperature by the hot water heating process, gradually decreases with the passage of time. When the pre-detected temperature is lower than the reference heating start temperature, heat treatment for instant hot water is performed.
On the other hand, in the low frequency time zone, when the pre-heating detection temperature is lower than the low frequency heating start temperature which is lower than the reference heating start temperature, the instant hot water heating process is executed. In the frequency time zone, the frequency with which the heat treatment for instant hot water is performed can be reduced.

Therefore, by performing the instant hot water heating process even in the low frequency time period, the instant hot water heating process is performed in the low frequency time period while avoiding discomfort to the user. Loss of heating energy can be suppressed by reducing the frequency of heating.

In short, according to the characteristic structure of the hot water supply apparatus of the present invention, it is possible to suppress the loss of heating energy while avoiding discomfort to the user.

According to a further characteristic configuration of the instant hot water supply apparatus of the present invention, the time zone setting unit sets the high frequency time zone as the hot water supply frequency corresponding time zone to the reference frequency time zone and the hot water supply more than the reference frequency time zone. It is set separately for high frequency and high frequency time zones,
The operation control unit sets the reference heating start temperature as the reference heating start temperature in the reference frequency time period, and sets the reference heating start temperature as the reference heating start temperature in the high frequency time period. The point is to set a high-frequency heating start temperature higher than the start temperature.

That is, in the reference frequency time period of the high frequency time period, when the pre-heating detection temperature detected by the hot water temperature detection sensor is lower than the reference heating start temperature set lower than the set target temperature, immediately Hot water heat treatment is performed.
On the other hand, in the high-frequency time zone in which the hot water supply frequency is higher than the standard frequency time zone, the pre-heating detection temperature detected by the hot water temperature detection sensor is higher than the reference heating start temperature. If the temperature is lower than the high frequency heating start temperature, the hot water heating process is executed.

In other words, the temperature of the hot water in the hot water circulation circuit, after being heated to the set target temperature by the hot water heating process, gradually decreases with the passage of time. When the pre-detected temperature is lower than the reference heating start temperature, heat treatment for instant hot water is performed.
On the other hand, in the high-frequency time zone, when the pre-heating detection temperature is lower than the high-frequency heating start temperature which is higher than the reference heating start temperature, the instant hot water heating process is executed. During the frequency time zone, the temperature of the hot water in the hot water circulation circuit is maintained as close to the set target temperature as possible, so that the temperature of the hot water can be made more uniform when the hot water tap is opened to supply hot water. , and as a result, the usability of the user can be improved.

To explain, even in the standard frequency time period, if the pre-heating detection temperature is lower than the high frequency heating start temperature that is higher than the standard heating start temperature, if the instant hot water heating process is executed, the heating energy However, in the high-frequency time period when the hot water supply frequency is extremely high, the temperature of the hot water in the hot water circulation circuit is kept as close as possible to the set target temperature, so that the heating energy is saved. It is possible to improve the usability of the user while suppressing the loss.

In short, according to the further characteristic configuration of the hot water supply apparatus of the present invention, it is possible to improve usability for the user while suppressing the loss of heating energy.

According to a further characteristic configuration of the instant hot water supply system of the present invention, the operation control unit operates the circulation pump in the low frequency time period, based on the detection information of the hot water temperature detection sensor. The sterilization heat treatment is performed by heating the instant hot water heating unit so that the temperature of the hot water in the instant hot water circulation circuit is set to a sterilizing temperature higher than the set target temperature.

That is, in the low-frequency time zone, the heat treatment for sterilization is performed, and the temperature of the hot water in the hot water circulation circuit is raised to the sterilization temperature (for example, 65° C.) higher than the set target temperature. To appropriately maintain hot water in a hot water circulation circuit in a clean state by suppressing generation of bacteria such as Legionella bacteria in hot water in the hot water circulation circuit.

Then, when the hot water in the hot water circulation circuit is raised to a sterilizing temperature higher than the set target temperature and the high temperature hot water is used to supply hot water from the hot water tap, the temperature of the hot water to be supplied becomes high. However, in the low frequency time zone, the frequency of hot water supply when the hot water tap is opened to supply hot water is low, so that the user can be prevented from feeling uncomfortable as much as possible.

In short, according to the further characteristic configuration of the instant hot water supply apparatus of the present invention, the hot water in the instant hot water circulation circuit can be appropriately maintained in a clean state while avoiding discomfort to the user as much as possible.

A further feature of the instant hot water supply apparatus of the present invention is that the time period setting unit sets the hot water supply frequency corresponding time period for each day of the week.

That is, since the hot water supply frequency corresponding time zone is set separately for each day of the week, for each day of the week, for example, a high frequency time zone and a low frequency time zone are set. , the hot water supply frequency corresponding time zone can be appropriately set for each day of the week.

In short, according to the further characteristic configuration of the instant hot water type hot water supply apparatus of the present invention, the hot water supply frequency corresponding time zone can be appropriately set for each day of the week.

A further characteristic configuration of the instant hot water supply system of the present invention is that the time period setting unit learns the number of times the hot water supply state occurs for each time period, and sets the time period corresponding to the hot water supply frequency based on the learning result. There is a point to set.

That is, the number of times the hot water tap is opened to supply hot water is learned for each time period, and the hot water supply frequency corresponding time period is set based on the learning result. It can be set accurately and without troublesome work.

In other words, it is conceivable that the user inputs and sets the corresponding hot water supply frequency time zone, for example, the user inputs the high frequency time zone and the low frequency time zone to set the time zone corresponding to the hot water supply frequency. However, in this case, not only is troublesome work required, but there is also the possibility that the hot water supply frequency corresponding time zone cannot be set accurately due to an input error or misunderstanding.

In short, according to the further characteristic configuration of the instant hot water type hot water supply apparatus of the present invention, the hot water supply frequency corresponding time zone can be set accurately and without troublesome work.

A further characteristic configuration of the instant hot water type hot water supply apparatus of the present invention is that the operation control unit operates the circulation pump while the heating operation of the instant hot water heating unit is stopped. The pre-heating detection process for detecting the detected temperature as the pre-heating detected temperature is repeatedly executed at set time intervals.

That is, the pre-heating detection process for detecting, as the pre-heating detection temperature, the temperature detected by the hot water temperature detection sensor when the circulation pump is operated in a state where the heating operation of the heating unit for hot water is stopped is performed at set time intervals. When the pre-heating detection temperature detected by the pre-heating detection process is repeatedly executed and is lower than the set heating start temperature, the hot water heating process is executed.

That is, by repeatedly executing the pre-heating detection process at set time intervals, as a result, the instant hot water heating process is also repeatedly executed at set time intervals. Unnecessarily frequent heat treatment can be suppressed.

In addition, the pre-heating detection temperature detected by the hot water temperature detection sensor in the pre-heating detection process is the detection of the hot water temperature detection sensor when the circulation pump is operated in a state where the heating operation of the heating unit for instant hot water is stopped. Since it is the temperature, it is possible to detect the temperature of the hot water located in each part of the hot water circulation circuit. Even when the temperature of hot water located in each part of the circulation circuit for instant hot water differs, such as when the temperature is set to the pre-detection temperature, the temperature of hot water located inside the circulation circuit for instant hot water can be appropriately detected.

In short, according to a further characteristic configuration of the instant hot water supply apparatus of the present invention, the instant hot water heating process is suppressed from being performed unnecessarily frequently, and the hot water located inside the instant hot water circulation circuit is Temperature can be detected properly.

A further characteristic configuration of the hot water supply apparatus of the present invention is that the operation control unit sets the set time interval to be longer in the low frequency time period than in the high frequency time period.

That is, since the set time interval is set longer in the low-frequency time period than in the high-frequency time period, the frequency of execution of the pre-heating detection process and the hot water heating process is reduced in the low-frequency time period. be able to.

That is, in the high-frequency time zone, the set time interval is set short so that the pre-heating detection process is performed before the hot water in the hot water circulation circuit drops significantly. To prevent the temperature of hot water in a circulation circuit from greatly deviating from a set target temperature.
On the other hand, in the low-frequency time period during which the frequency of hot water supply is low, the set time interval is set long to reduce the frequency of execution of the pre-heating detection process and the instant hot water heating process. As a result, it is possible to further suppress the consumption of energy due to the heat treatment for instant hot water.

In short, according to the characteristic configuration of the hot water supply apparatus of the present invention, energy consumption can be further suppressed.

A further characteristic configuration of the instant hot water type hot water supply apparatus of the present invention is that the operation control unit operates the circulation pump while the heating operation of the instant hot water heating unit is stopped. A pre-heating detection process of detecting the detected temperature as the pre-heating detected temperature is repeatedly executed at set time intervals, and in the high frequency time period, the set time interval is shorter than the reference frequency time period. There is a point to set.

That is, as described above, by repeatedly executing the pre-heating detection process at set time intervals, it is possible to suppress the unnecessarily frequent execution of the instant hot water heating process, and to prevent the immediate hot water circulation circuit from being performed unnecessarily. Even when the temperature of the hot water located in each part is different, the temperature of the hot water located inside the hot water circulation circuit can be appropriately detected.

Since the set time interval is set shorter than the reference frequency time period in the high frequency time period, the pre-heating detection process is repeatedly executed at short time intervals in the high frequency time period.

In other words, the temperature of the hot water in the hot water circulation circuit, after being heated to the set target temperature by the hot water heating process, gradually decreases with the passage of time. Since the pre-heating detection process is repeatedly executed at short time intervals, before the temperature of the hot water in the hot water circulation circuit drops significantly below the high-frequency heating start temperature, the hot water circulation is detected by the pre-heating detection process. By detecting the temperature of the hot water in the circuit, if the pre-heating detection temperature is lower than the frequent heating start temperature, instant hot water heating can be executed.

In this way, if the pre-heating detection temperature is lower than the high frequency heating start temperature before the temperature of the hot water in the hot water circulation circuit drops significantly below the high frequency heating start temperature, the instant hot water heating is started. Since the process can be executed, the temperature of the hot water in the hot water circulation circuit can be accurately maintained close to the set target temperature, so that the usability of the user can be further improved.

In short, according to the characteristic configuration of the instant hot water type hot water supply apparatus of the present invention, the temperature of the hot water in the instant hot water circulation circuit is accurately maintained close to the set target temperature in the frequent time zone, and the hot water is used. It is possible to further improve the usability of users.

A further characteristic configuration of the instant hot water type hot water supply apparatus of the present invention is that the instant hot water circulation circuit includes the hot water supply path, a water supply side return path connecting the hot water supply tap side end portion of the hot water supply path and the water supply path, and a water supply side downstream flow path downstream of the connection point of the water supply side return path in the water supply path,
The hot water supply heating unit is also used as the hot water heating unit,
The point is that the water supply temperature sensor arranged in the water supply side downstream channel is also used as the hot water temperature detection sensor.

That is, while using the hot water heating part as the hot water heating part, the hot water circulation circuit is a hot water supply passage that guides the hot water heated by the hot water heating part to the hot water tap, and the hot water supply tap side of the hot water supply path. Since it is composed of a water supply side return passage connecting the end portion and the water supply passage, and a water supply side downstream passage downstream of the connection point of the water supply side return passage in the water supply passage, hot water is supplied to the hot water tap. Instant hot water can be performed with a simple configuration using the configuration for.

In addition, a water supply temperature sensor is arranged in the water supply side downstream of the water supply passage for the purpose of controlling the temperature of hot water supplied to the hot water tap. Since it is used as a hot water temperature detection sensor that is necessary when performing heat treatment for instant hot water, instant hot water is provided with a simple configuration that utilizes a configuration for supplying hot water to the hot water tap. be able to.

In short, according to the further characteristic configuration of the instant hot water supply apparatus of the present invention, instant hot water can be provided with a simple configuration using the configuration for supplying hot water to the hot water tap.

According to a further characteristic configuration of the instant hot water supply apparatus of the present invention, the instant hot water circulation circuit connects an end portion of the hot water supply passage on the hot water tap side and an upstream location of the hot water tap side portion of the hot water supply passage. a hot water supply side return path, and a hot water tap side portion downstream of a connection point of the hot water supply side return path in the hot water supply path,
The circulation pump and the instant hot water heating unit are disposed in the hot water supply side return path,
A return temperature sensor arranged in the hot water supply side return path is provided as the hot water temperature detection sensor.

That is, the hot water supply circulation circuit connects the hot water supply valve side end portion of the hot water supply passage with the upstream portion of the hot water supply valve side portion of the hot water supply passage, and the connection of the hot water supply side return passage in the hot water supply passage. Since the hot water faucet side portion is downstream of the point, the hot water circulation circuit can be configured in a state separated from the water supply passage for supplying hot water to the hot water heating portion.

Then, the circulation pump and the hot water heater are arranged in the hot water supply side return passage, and in addition, a return temperature sensor is arranged in the hot water supply side return passage as a hot water temperature detection sensor. The detection process and the heating process for instant hot water can be performed in a state separated from the heating operation of the heating unit for hot water supply.

Therefore, it is possible to diversify the hot water supply mode of the hot water heated by the hot water heating unit. That is, for example, a branch path for supplying hot water to another hot water supply location such as a bathtub is branched from a location on the upstream side of the connection location of the return path on the hot water supply side in the hot water supply path, and the hot water from the hot water supply path When hot water is supplied to another hot water supply location such as a hot water supply heating unit, hot water is supplied to another location such as a bathtub while performing preheating detection processing and instant hot water heating processing. can be performed, and the hot water supply mode of the hot water heated by the hot water heating unit can be diversified.

In short, according to the further characteristic configuration of the hot water supply apparatus of the present invention, it is possible to provide diversity in the hot water supply mode of the hot water heated by the hot water supply heating unit.

It is a figure which shows the whole structure of a hot-water-type hot water supply apparatus. It is a figure which shows a learning table. It is a flow chart of hot water processing. It is a figure which shows the whole structure of the instant hot-water-type hot water supply apparatus of another embodiment.

[Embodiment]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.
(Overall configuration of hot water heater)
As shown in FIG. 1, the instant hot water supply apparatus includes a heat source G and an instant hot water unit H for supplying hot water to a hot water tap 1 in a kitchen or washroom. In the present embodiment, the hot water faucet 1 is a mixed faucet type hot water faucet that mixes hot and cold water.
The heat source device G has a function of supplying hot water to a bathtub (not shown) in addition to the hot water tap 1, but in this embodiment, the details of the configuration for supplying hot water to the bathtub are omitted.

The heat source machine G is provided with a heat source side control section Cg for controlling operation, the hot water unit H is provided with a unit side control section Ch for controlling operation, and the heat source side control section Cg and the unit side control section Ch are connected by a communication line. D is connected so that various information can be freely communicated.
The heat source side control section Cg and the unit side control section Ch constitute an operation control section C for executing the instant hot water treatment, which will be described later.

A remote controller R is provided as a manually operated command section for commanding various control commands to the heat source side control section Cg. Incidentally, as the remote controller R, there are a main remote controller installed in the kitchen and a bathroom remote controller installed in the bathroom.
The remote controller R includes command switches for issuing various commands, such as an operation switch for commanding the start and stop of the operation of the heat source unit G and the hot water unit H, and a hot water switch for commanding the start and stop of the hot water treatment, which will be described later. , setting switches such as a hot water supply temperature setting switch for setting the set target temperature for hot water supply, and a display section for displaying various information such as the set target temperature.

As shown in FIG. 1, the heat source device G includes a hot water heating unit A that heats water from a water supply channel 2 connected to a general household water pipe and discharges hot water after heating to a hot water supply channel 3. is provided, and an external hot water supply passage 3</b>A extending outside the heat source machine G in the hot water supply passage 3 is connected to the hot water supply tap 1 .
A branch water supply passage 4 branching from an external water supply passage 2</b>A located outside the heat source device G in the water supply passage 2 is connected to the hot water tap 1 .
It should be noted that the external hot water supply passage 3A includes the hot water supply cock side portion 3a of the hot water supply passage 3. As shown in FIG.

(Structure of heating unit for hot water supply)
The hot water supply heating unit A includes a hot water supply heat exchanger 5 having an inlet side connected to the water supply path 2 and an outlet side connected to the hot water supply path 3, a hot water supply burner 6 for heating the hot water supply heat exchanger 5, and A hot water supply blower fan 7 for supplying combustion air to the hot water supply burner 6 is provided, and the hot water flowing through the hot water supply heat exchanger 5 is heated by the combustion gas of the hot water supply burner 6 .

A hot water supply burner 6 provided in the hot water supply heating section A is connected to a hot water supply side gas supply path 8 for supplying fuel gas such as city gas.
The gas supply passage 8 on the hot water supply side is provided with an electromagnetic gas proportional valve 9 for adjusting the amount of fuel gas supplied and an intermittent valve 10 for intermittently supplying the fuel gas.
Although illustration is omitted, an igniter for ignition and a flame rod for detecting ignition are provided near the hot water supply burner 6 .

(Composition for general hot water supply)
The water supply passage 2 is provided with a water supply thermistor 11 (an example of a water supply temperature sensor) for detecting the temperature of water supply and a water quantity sensor 12 for detecting the amount of water supply.
The hot water supply path 3 is also provided with a hot water supply thermistor 13 (an example of a hot water supply temperature sensor) that detects the temperature of hot water.

(Composition for instant hot water)
An immediate hot water circulation circuit J including at least a hot water tap side portion 3a of the hot water supply passage 3 is provided. In this embodiment, the instant hot water circulation circuit J includes the entire hot water supply passage 3 including the hot water supply cock side portion 3a, the hot water supply cock side end portion of the hot water supply passage 3 (the location located near the hot water supply cock 1), and the hot water supply passage 3. It is composed of a water supply side return path 14 connecting the water supply path 2 to the external water supply path 2A and a water supply side downstream path downstream of the connection point of the water supply side return path 14 in the water supply path 2 .
In this embodiment, the water supply side return path 14 is provided so as to pass through the inside of the hot water unit H. As shown in FIG.

The hot water circulation circuit J is provided with a circulation pump 15, a hot water heater K, and a hot water temperature sensor M.
In this embodiment, the instant hot water heating section K is configured to also serve as the hot water heating section A, and the hot water temperature detection sensor M is located downstream of the connection point of the water supply side return path 14 in the water supply path 2. The water supply thermistor 11 disposed in the side downstream flow path is also used.
In this embodiment, the circulation pump 15 is arranged inside the hot water unit H, and a unit for backflow prevention is provided at the downstream side of the circulation pump 15 in the water supply side return path 14 located inside the hot water unit H. A side check valve 16 is provided.

An air release valve 17 and an accumulator 18 that absorbs expansion of hot water are provided in a passage portion corresponding to a portion between the hot water supply side end portion of the water supply side return passage 14 and the circulation pump 15 .
Further, a water supply path side check valve 19 for preventing backflow is provided in a flow path portion corresponding to between the branch point of the branch water supply path 4 and the connection point of the water supply side return path 14 in the external water supply path 2A.

Therefore, in a state in which the circulation pump 15 is operated to circulate hot water in the hot water circulation circuit J, the hot water in the hot water circulation circuit J is circulated by heating the hot water supply heating unit A. It is configured to be able to raise the temperature to the set target temperature.

(general hot water supply operation)
The heat source side control section Cg in the operation control section C enters a controllable state when the operation switch is turned on, and executes a hot water supply operation in which hot water is supplied from the hot water tap 1 when the hot water tap 1 is opened.
That is, the heat source side control unit Cg executes the hot water supply operation when the amount of water detected by the water amount sensor 12 reaches or exceeds the predetermined amount for ignition when the pre-heating detection process in the instant hot water process or the instant hot water heating process is not being executed. do.

As will be described later, the heat source side control section Cg in the operation control section C operates the circulation pump 15 in the unit side control section Ch to perform the pre-heating detection process in the hot water treatment and the hot water heating process. When the amount of water detected by the water amount sensor 12 becomes equal to or greater than the set discrimination amount obtained by adding the set increase amount to the predetermined amount for ignition, the hot water supply operation is executed. Incidentally, when the hot water supply operation is executed, the heat source side control section Cg transmits a hot water supply signal to the unit side control section Ch to stop the circulation pump 15 and perform preheating detection processing in the hot water treatment and heating for the hot water. Processing will stop.

That is, in the pre-heating detection process in the instant hot water process and the instant hot water heating process, the operation control unit C operates the circulation pump 15 to supply hot water in a state where the amount of water detected by the water amount sensor 12 reaches the predetermined amount for ignition. In the circulating state, if the amount of water detected by the water amount sensor 12 is equal to or greater than the set determination amount obtained by adding the set increase amount to the predetermined amount for ignition, the hot water supply tap 1 is opened. Assuming that there is, the circulation pump 15 is stopped and the hot water supply operation is executed.

In the hot water supply operation, after driving the hot water supply blower fan 7 in the hot water supply heating unit A, the intermittent valve 10 is opened to ignite the hot water supply burner 6 by the igniter, and the set target temperature set by the hot water supply temperature setting switch, Based on the amount of water detected by the water quantity sensor 12, the water temperature detected by the water supply thermistor 11, and the temperature detected by the hot water supply thermistor 13, the temperature detected by the hot water supply thermistor 13 is set to the set target temperature set by the hot water supply temperature setting switch. A process for adjusting the opening degree of the valve 9 is executed.
Then, when the flow of water is no longer detected by the water quantity sensor 12, the intermittent valve 10 is closed to stop the combustion of the hot water supply burner 6, the hot water supply blower fan 7 is stopped, and the hot water supply operation is terminated. .

(Regarding the time zone setting section)
The operation control unit C sets a hot water supply frequency corresponding time zone including a high frequency time zone in which the hot water supply valve 1 is opened to supply hot water in a day and a low frequency time zone in which the hot water supply frequency is low. It is configured to function as a time zone setting unit T.
Further, in the present embodiment, the time period setting unit T divides the high frequency time period into a standard frequency time period and a high frequency time period in which the hot water supply frequency is higher than the standard frequency time period as the hot water supply frequency corresponding time period. configured to be set as

Furthermore, in the present embodiment, the time period setting unit T is configured to set the hot water supply frequency corresponding time period for each day of the week.
Further, the time period setting unit T is configured to learn the number of hot water supply states for each time period, and to set the hot water supply frequency corresponding time period based on the learning result.
That is, as shown in FIG. 2, the operation control unit C divides each day of the week into a plurality of (eight in this embodiment) time zones, and for each time zone, the hot water tap 1 is turned on. It is configured to repeat the learning of the number of times the door is opened to supply hot water.

To add an explanation, in this embodiment, the unit-side control section Ch has a storage table shown in FIG. Then, the heat source side control section Cg transmits a hot water supply signal indicating that the hot water supply state is set to the unit side control section Ch. is configured to store the number of times hot water is supplied for a plurality of (eight in this embodiment) time periods for each day of the week.

Then, the unit-side control section Ch sets the time period in which the hot water supply state is 0 times as the low frequency time period, and sets the time period in which the hot water supply state is 1 or more times as the high frequency time period. do.
Further, the unit-side control part Ch sets a time period in which the number of hot water supply states is four or less among the high frequency time periods as the standard frequency time period, and the number of times the hot water supply state is five or more. is set as a high-frequency time period.

Incidentally, on the current day, the unit-side control section Ch sets the low-frequency time zone, the reference frequency time zone, and the high-frequency time zone for that day based on the contents stored in the storage table one week ago, and On the current day, based on the hot water supply signal from the heat source side control section Cg, the number of hot water supply times for each time period on the current day is stored.

(Instant water treatment)
The operation control unit C executes the instant hot water treatment when the instant hot water switch is instructed to start the instant hot water treatment in a state where the operation switch is turned on.
When the pre-heating detection temperature detected by the water supply thermistor 11 is lower than the set heating start temperature lower than the set target temperature in a state where the heating operation of the hot water supply heating unit A is stopped, the operation control unit C operates the circulation pump 15. is activated, based on the detection information of the water supply thermistor 11, the temperature of the hot water in the hot water circulation circuit J is set to the set target temperature (for example, 60° C.). The heating process for hot water is repeatedly executed.

In this embodiment, the operation control unit C detects the temperature detected by the water supply thermistor 11 when the circulation pump 15 is operated with the heating operation of the hot water supply heating unit A stopped as the preheating detection temperature. The detection process is repeatedly executed at set time intervals (for example, 20 minutes).
This pre-heating detection process is executed over a detection process time set to at least the time required for the hot water in the hot water circulation circuit J to make one circulation. The lowest temperature among the detected temperatures of the water supply thermistor 11 is determined as the pre-heating detected temperature.
The operation control unit C is configured to perform heat treatment for instant hot water when the pre-heating detected temperature is lower than the heating start temperature (for example, 55° C.) set lower than the set target temperature. there is

Then, in the reference frequency time period in the high frequency time period, when the pre-heating detection temperature is lower than the reference heating start temperature (for example, 55° C.) set lower than the set target temperature, the operation control unit C If the instant hot water heat treatment is executed and the pre-heating detection temperature is lower than the low-frequency heating start temperature (for example, 50°C) that is lower than the reference heating start temperature in the low-frequency time period, It is configured to perform hot water heat treatment.

Furthermore, in the high frequency time zone and in the standard frequency time zone, as described above, if the detected temperature before heating is lower than the reference heating start temperature (for example, 55° C.), the operation control unit C Heating is performed, and if the pre-heating detection temperature is lower than the high-frequency heating start temperature (for example, 58°C) higher than the reference heating start temperature in the high-frequency time period, instant hot water heating is performed. configured to do the work.
That is, the operation control unit C sets the reference heating start temperature as the reference heating start temperature in the reference frequency time period, and sets the reference heating start temperature as the reference heating start temperature in the high frequency time period. A higher frequency heating start temperature is set.

In this embodiment, the heat source side control unit Cg outputs the instant hot water start signal at a set time interval (for example, 20 minutes), the unit side controller Ch operates the circulation pump 15 for the pre-heating detection process based on the instant hot water start signal.
The heat source side controller Cg acquires the detected temperature of the water supply thermistor 11 while the circulation pump 15 is operating as the pre-heating detected temperature.

When the pre-heating detection temperature detected in the pre-heating detection process is not lower than the set heating start temperature, the heat source side control section Cg will transmit an immediate hot water stop signal to the unit side control section Ch. , the unit-side control section Ch stops the circulation pump 15 based on the immediate hot water stop signal.

Further, when the pre-heating detection temperature detected in the pre-heating detection process is lower than the set heating start temperature, the heat source side control unit Cg causes the hot water supply heating unit A to perform heating, and then the water supply thermistor 11 When the detected temperature reaches the set target temperature, the heating operation of the hot water supply heating portion A is stopped, and an immediate hot water stop signal is transmitted to the unit side control portion Ch.
The unit-side controller Ch stops the circulation pump 15 based on the immediate hot water stop signal.

Furthermore, when the heat source side control section Cg executes the hot water supply operation, if the pre-heating detection process or the instant hot water heating process is being executed, the process is interrupted, and as described above, the hot water supply signal is sent to the unit side. It is transmitted to the control section Ch. Also, when the hot water supply operation ends, a hot water supply end signal is transmitted to the unit-side controller Ch.

When the unit-side control section Ch is operating the circulation pump 15 in order to perform the pre-heating detection process and the instant hot water heating process based on the hot water supply signal, the operation of the circulation pump 15 is stopped and Based on the hot water supply signal, the number of times of hot water supply for each day of the week is stored for a plurality of (eight in this embodiment) time periods.

(Adjustment of set time interval)
In addition, the operation control unit C (heat source side control unit Cg) sets the set time interval longer in the low frequency time zone than in the high frequency time zone, and in the high frequency time zone in the high frequency time zone, It is configured to set the set time interval shorter than the reference frequency time period.

That is, the operation control unit C (heat source side control unit Cg) sets the set time interval to the reference time interval (for example, 20 minutes) in the high frequency time zone, and sets the set time interval to the reference time interval (for example, 20 minutes) in the low frequency time zone It is configured to set a low-frequency time interval (for example, 60 minutes) longer than the reference time interval.
Furthermore, the operation control unit C (heat source side control unit Cg) sets the set time interval to the reference time interval (for example, 20 minutes) in the high frequency time period, in the standard frequency time period, and in the high frequency time period is configured to set the set time interval to a frequent time interval (for example, 10 minutes) shorter than the reference time interval.

That is, the unit-side control section Ch transmits to the heat source-side control section Cg time zone information indicating whether each time zone of the day is a low frequency time zone, a standard frequency time zone, or a high frequency time zone. , the heat source side control unit Cg is configured to change and set the set time interval for performing the pre-heating detection process based on the time zone information.

(Sterilization treatment)
The operation control unit C sets the temperature of the hot water in the hot water circulation circuit to a higher than the set target temperature based on the detection information of the water supply thermistor 11 in a state where the circulation pump 15 is operated in the low frequency time zone. It is configured to perform a sterilization heat treatment in which the hot water supply heating unit A (instant hot water heating unit K) is heated to a temperature (for example, 65° C.).

That is, the unit-side control section Ch operates the circulation pump 15 and transmits a sterilization heating signal to the heat source-side control section Cg in the low frequency time zone, and the heat source-side control section Cg In order to raise the detected temperature of the water supply thermistor 11 to the sterilization temperature (for example, 65° C.), the hot water supply heating section A (instant hot water heating section K) is heated.
By the way, the time period during which the sterilization heat treatment is performed is preferably a time period in which the hot water supply state is less likely to occur even in the low frequency time period. process will be executed.

(Details of hot water treatment)
Next, the control operation of the operation control section C in the hot water treatment will be explained based on the flowchart of FIG.
First, it is determined whether or not it is a low frequency time zone (#1), and if it is not a low frequency time zone, it is determined whether or not it is a reference frequency time zone (#6).

If it is determined in the process of #1 that it is the low-frequency time zone, whether or not the passage of time is the timing for executing the pre-heating detection process, that is, at the low-frequency time interval (for example, 60 minutes) It is determined whether or not there is (#2), and if it is not a low-frequency time interval, the process proceeds to #1.
In the process of #2, if the elapsed time is the low-frequency time interval, the pre-heating detection process is executed (#3), and then the pre-heating detection temperature is the low-frequency heating start temperature (for example, 50° C.) is determined (#4).

If the pre-heating detection temperature is not lower than the low-frequency heating start temperature in the process of #4, the process proceeds to the process of #1.
If the pre-heating detection temperature is lower than the low frequency heating start temperature in the process of #4, the instant hot water heating process is executed (#5), and then the process proceeds to the process of #1.

In the process of #6, if it is determined that it is the reference frequency time period, it is determined whether the elapsed time is the timing for executing the pre-heating detection process, that is, the reference time interval (for example, 20 minutes). (#7), and if it is not the reference time interval, the process proceeds to #1.
In the process of #7, if the elapsed time is the reference time interval, the pre-heating detection process is executed (#8), and then the pre-heating detection temperature is higher than the reference heating start temperature (eg, 55°C). is also low (#9).

If the pre-heating detection temperature is not lower than the reference heating start temperature in the process of #9, the process proceeds to the process of #1.
If the pre-heating detection temperature is lower than the reference heating start temperature in the process of #9, the hot water heating process is executed (#5), and then the process of #1 is performed.

In the process of #6, if it is determined that it is not the reference frequency time period (if it is the high frequency time period), it is determined whether or not the elapsed time is the timing for executing the pre-heating detection process. It is determined whether or not it is the time interval for frequent use (for example, 10 minutes) (#10), and if the elapsed time is not the time interval for frequent use, the process proceeds to #1.
In the process of #10, when the elapsed time is the frequent time interval, the pre-heating detection process is executed (#11). 58° C.) is determined (#12).

If the pre-heating detection temperature is not lower than the high-frequency heating start temperature in the process of #12, the process proceeds to the process of #1.
In the process of #12, if the pre-heating detection temperature is lower than the frequent heating start temperature, the instant hot water heating process is executed (#5), and then the process proceeds to #1.

[Another embodiment]
Next, another embodiment will be described with reference to FIG. This is an example of a case where a heating medium heating unit B for heating the supplied heating medium is provided. detailed description is omitted.

(Heat medium supply configuration)
As shown in FIG. 4, the heat source device G includes a heating medium heating unit B for heating a heating medium that is circulated and supplied to the heat consumption terminal. A liquid-liquid heat exchanger 21 is provided in which the heat medium heated by the heating unit B is circulated and supplied.
A heat medium circulation circuit L that circulates the heat medium between the heat medium heating unit B and the heat consumption terminal, and a heat medium circulation pump 22 that circulates the heat medium through the heat medium circulation circuit L are provided.

The heat medium heating unit B is a heat exchange for heating the heat medium, in which the heat medium return path 23 of the heat medium circulation circuit L is connected to the inlet side, and the heat medium forward path 24 of the heat medium circulation circuit L is connected to the outlet side. a heating medium heating burner 26 for heating the heating medium heating heat exchanger 25; and a heating medium blowing fan 27 for supplying combustion air to the heating medium heating burner 26. The heat medium flowing through the heat exchanger 25 is heated by the combustion gas from the heat medium heating burner 26 .

A heating medium-side gas supply path 28 for supplying fuel gas such as city gas is connected to a heating medium heating burner 26 provided in the heating section B for heating medium.
The heating medium side gas supply passage 28 is provided with an electromagnetic heating medium side gas proportional valve 29 for adjusting the fuel gas supply amount and a heating medium side intermittence valve 30 for intermitting supply of the fuel gas.
Although illustration is omitted, an igniter for ignition and a flame rod for detecting ignition are provided near the heating medium heating burner 26 .

A heat medium return header 31 is provided at the inlet end of the heat medium return path 23 , and a heat medium forward header 32 is provided at the outlet side end of the heat medium forward path 24 . Then, a heat medium end going path 33 is provided to supply the heat medium from the heat medium going header 32 to the liquid-liquid heat exchanger 21 , and the heat medium from the liquid-liquid heat exchanger 21 is supplied to the heat medium return header 31 . A heat medium terminal return path 34 is provided.
A thermal valve 35 for interrupting the supply of the heat medium is provided in the heat medium terminal forward passage 33 .

The heat medium return path 23 is provided with an expansion tank 36 and the heat medium circulation pump 22 described above, and the heat medium forward path 24 is provided with a heat medium thermistor 37 for detecting the temperature of the supplied heat medium. there is
Incidentally, between the heat medium forward header 32 and the heat medium return header 31, a heat medium terminal forward path 33 and a heat medium terminal return path 34 for circulating the heat medium between other heat consuming terminals are provided. However, detailed description is omitted in this embodiment.
In addition, when the thermal valve 35 is closed, a connection path is provided for short-circuiting the heat medium in the heat medium forward path 24 to the heat medium return path 23 and causing it to flow. omitted.

(terminal heating operation)
When the remote controller R is instructed to start the terminal heating operation, the heat source side control unit Cg executes the terminal heating operation.
In the terminal heating operation, the heat medium circulation pump 22 is operated to circulate the heat medium, and the heat medium heating burner 26 is burned while the heat medium blower fan 27 is operated. The opening degree of the heating medium side gas proportional valve 29 is adjusted so that the detected temperature of the thermistor 37 becomes the heating medium supply temperature (for example, 70° C.).
Incidentally, when the liquid-liquid heat exchanger 21 is operated for heating, the heat source side controller Cg opens the thermal valve 35 to circulate and supply the heat medium to the liquid-liquid heat exchanger 21 .

(Composition for instant hot water)
An immediate hot water circulation circuit J including at least a hot water tap side portion 3a of the hot water supply passage 3 is provided. In this embodiment, most of the external hot water supply passage 3A is configured to form the hot water supply valve side portion 3a.
Then, the hot water circulation circuit J connects the hot water tap side end portion of the external hot water supply passage 3A (the portion located near the hot water tap 1) and the upstream portion of the hot water tap side portion 3a in the hot water supply passage 3. It is composed of a hot water supply side return path 38 and a hot water supply tap side portion 3a located downstream of the connection point of the hot water supply side return path 38 in the external hot water supply path 3A of the hot water supply path 3 .
Incidentally, a hot water supply side check valve 39 for preventing reverse flow is provided at a location upstream of the connection location of the hot water supply side return path 38 in the external hot water supply path 3A.

A circulation pump 15, a unit-side check valve 16, and a liquid-liquid heat exchanger 21 as a hot-water heating unit K are disposed in a portion of the hot-water supply-side return passage 38 located inside the hot-water unit H. there is
Further, as the hot water temperature detection sensor M, a return temperature sensor 40 arranged in a portion of the hot water supply side return path 38 located inside the hot water unit H is provided.

(Instant water treatment)
The operation control unit C executes the instant hot water treatment when the instant hot water switch is operated in a state where the operation switch is turned on.
The operation control unit C operates the circulation pump 15 when the pre-heating detection temperature detected by the return temperature sensor 40 is lower than the set heating start temperature in a state where the heating operation of the liquid heat exchanger 21 is stopped. In this state, based on the information detected by the return temperature sensor 40, the liquid-liquid heat exchanger 21 is heated to set the temperature of the hot water in the circulation circuit J for hot water to a set target temperature (for example, 60° C.). The heat treatment is repeated.

In this embodiment, the operation control unit C detects pre-heating of the return temperature sensor 40 when the circulation pump 15 is operated in a state where the heating operation of the liquid-liquid heat exchanger 21 is stopped by closing the thermal valve 35. A pre-heating detection process for detecting temperature is repeatedly performed at set time intervals (for example, 20 minutes).
This pre-heating detection process is executed over a detection process time set to at least the time required for the hot water in the hot water circulation circuit J to make one circulation. The lowest temperature among the temperatures detected by the return temperature sensor 40 is determined as the pre-heating detection temperature.
The operation control unit C is configured to perform heat treatment for instant hot water when the pre-heating detected temperature is lower than the heating start temperature (for example, 55° C.) set lower than the set target temperature. there is

Then, in the reference frequency time period of the high frequency time period, the operation control unit C sets the pre-heating detection temperature to a reference heating start temperature set lower than the set target temperature (for example, 55 °C), the heat treatment for instant hot water is performed, and in the low-frequency time zone, the pre-heating detection temperature is a low-frequency heating start temperature lower than the reference heating start temperature (e.g., 50 °C). If it is lower than , it is configured to perform a heat treatment for instant hot water.

Further, in the same manner as in the above-described embodiment, the operation control unit C controls that the pre-heating detected temperature is higher than the reference heating start temperature (for example, 55° C.) in the high-frequency time period and in the standard frequency time period, as described above. If the temperature is low, heat treatment for instant hot water is performed, and in the high-frequency time zone, the pre-heating detection temperature is lower than the high-frequency heating start temperature (e.g., 58°C) higher than the reference heating start temperature. In some cases, the heat treatment for hot water is configured to be executed.

In this embodiment, when the hot water switch is operated while the operation switch is turned on, the heat source side controller Cg outputs the hot water start signal to the unit side at a set time interval (for example, 20 minutes). This is sent to the controller Ch, and the unit-side controller Ch operates the circulation pump 15 for pre-heating detection processing based on the instant hot water start signal.
The unit-side control section Ch acquires the temperature detected by the return temperature sensor 40 while the circulation pump 15 is operating as the pre-heating detection temperature, and transmits the pre-heating detection temperature to the heat source-side control section Cg. .

When the pre-heating detection temperature detected in the pre-heating detection process is not lower than the set heating start temperature, the heat source side control section Cg will transmit an immediate hot water stop signal to the unit side control section Ch. , the unit-side control section Ch stops the circulation pump 15 based on the immediate hot water stop signal.

Further, when the pre-heating detection temperature detected in the pre-heating detection process is lower than the set heating start temperature, the heat source side control unit Cg opens the thermal valve 35 to heat the liquid-liquid heat exchanger 21. is started, and a heating start signal is transmitted to the unit side controller Ch.
After receiving the heating start signal, when the temperature detected by the return temperature sensor 40 becomes equal to or higher than the set target temperature, the unit side control section Ch transmits a heating stop signal to the heat source side control section Cg and operates the circulation pump 15. will have to stop.
Based on the heating stop signal, the heat source side controller Cg closes the thermal valve 35 to stop the heating operation of the liquid-liquid heat exchanger 21 .

Furthermore, when the heat source side control unit Cg executes the hot water supply operation when the amount of water detected by the water amount sensor 12 reaches or exceeds the predetermined amount for ignition, if the pre-heating detection process or the hot water heating process is being performed, When the process is interrupted and the instant hot water heating process is being executed, the thermal valve 35 is closed, and a hot water supply signal is sent to the unit side controller Ch. Also, when the hot water supply operation ends, a hot water supply end signal is transmitted to the unit-side controller Ch.

When the unit-side control section Ch is operating the circulation pump 15 in order to perform the pre-heating detection process and the instant hot water heating process based on the hot water supply signal, the operation of the circulation pump 15 is stopped and Based on the hot water supply signal, the number of times of hot water supply for each day of the week is stored for a plurality of (eight in this embodiment) time periods.

(Adjustment of set time interval)
In addition, the operation control unit C (heat source side control unit Cg) sets the set time interval longer in the low frequency time zone than in the high frequency time zone, and in the high frequency time zone in the high frequency time zone, It is configured to set the set time interval shorter than the reference frequency time period.

That is, the operation control unit C (heat source side control unit Cg) sets the set time interval to the reference time interval (for example, 20 minutes) in the high frequency time zone, and sets the set time interval to the reference time interval (for example, 20 minutes) in the low frequency time zone It is configured to set a low-frequency time interval (for example, 60 minutes) longer than the reference time interval.
Furthermore, the operation control unit C (heat source side control unit Cg) sets the set time interval to the reference time interval (for example, 20 minutes) in the high frequency time period, in the standard frequency time period, and in the high frequency time period is configured to set the set time interval to a frequent time interval (for example, 10 minutes) shorter than the reference time interval.

That is, the unit-side control section Ch transmits to the heat source-side control section Cg time zone information indicating whether each time zone of the day is a low frequency time zone, a standard frequency time zone, or a high frequency time zone. , the heat source side control unit Cg is configured to change and set the set time interval for performing the pre-heating detection process based on the time zone information.

[Other alternative embodiments]
Next, another embodiment will be described.
(1) In the above embodiment and another embodiment, the operation control section C is configured from the heat source side control section Cg and the unit side control section Ch. , the operation control unit C may be configured by the heat source side control unit Cg.

(2) In the above embodiment and another embodiment, the unit-side controller Ch includes the storage table, but the heat source-side controller Cg may include the storage table. In this case, the heat source side control section Cg may be used as a main part to configure the time zone setting section T. FIG.

(3) In the above embodiment and another embodiment, the operation control unit C constitutes the time period setting unit T. However, the time period setting unit T may be constituted by a dedicated control unit may be implemented.

(4) In the above another embodiment, the case where the liquid-liquid heat exchanger 21 to which the heat medium is circulated is provided as the heating unit K for hot water was exemplified. A heater-type heating unit that is heated by heating may be provided as a heating unit K for instant hot water.

(5) In the above embodiment and another embodiment, the hot water tap 1 is a mixed tap type hot water tap. may In this case, in the instant hot water heating process, hot water inside the instant hot water circulation circuit J is heated with the temperature of hot water supplied from the hot water tap 1 (for example, 40° C.) set as the set target temperature.

(6) In the above embodiment and another embodiment, when the operation control unit C operates the circulation pump 15 in a state in which the heating operation of the instant hot water heating unit K is stopped prior to the instant hot water heating process. Although the pre-heating detection process for detecting the temperature detected by the hot water temperature detection sensor M as the pre-heating detection temperature is repeatedly executed at set time intervals, the pre-heating detection process is not executed. The temperature detected by the hot water temperature detection sensor M in a state in which the heating operation of the heating unit K is stopped and the circulation pump 15 is stopped may be used as the pre-heating detection temperature.
In this case, when the pre-heating detection temperature detected by the hot water temperature detection sensor M drops below the set heating start temperature with the lapse of time, the instant hot water heating process is executed.

It should be noted that the configurations disclosed in the above embodiments (including other embodiments, the same shall apply hereinafter) can be applied in combination with configurations disclosed in other embodiments as long as there is no contradiction. The embodiments disclosed in this specification are exemplifications, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the object of the present invention.

3 Hot water supply path 3a Water tap side portion 4 Water supply path 13 Water supply temperature sensor 14 Water supply side return path 15 Circulation pump 38 Hot water supply side return path 40 Return temperature sensor A Heating unit for hot water supply C Operation control unit K Heating unit for instant hot water M Hot water temperature Detection sensor J Instant hot water circulation circuit T Time zone setting part

Claims (10)

A hot water supply circulation system comprising: a hot water supply heating unit for heating hot water from a water supply channel and supplying hot water to the hot water supply channel; a hot water supply valve connected to the hot water supply channel; A circuit and an operation control unit are provided,
The hot water circulation circuit is provided with a circulation pump, a hot water heating unit, and a hot water temperature detection sensor,
When the pre-heating detection temperature detected by the hot water temperature detection sensor in a state where the operation control unit stops the heating operation of the hot water heating unit is lower than the set heating start temperature which is lower than the set target temperature, While the circulation pump is in operation, the hot water heater is operated to heat the hot water in the hot water circulation circuit to the set target temperature based on the information detected by the hot water temperature detection sensor. An instant hot water heater that performs instant hot water heating,
a time period setting unit for setting hot water supply frequency corresponding time periods including a high frequency time period in which the hot water tap is opened to supply hot water and a low frequency time period in which the hot water supply frequency is low; provided,
The operation control unit sets the set heating start temperature to a reference heating start temperature in the high frequency time period, and sets the set heating start temperature to the reference heating start temperature in the low frequency time period. A hot water heater set to a lower low-frequency heating start temperature. The time zone setting unit sets the high frequency time zone as the hot water supply frequency corresponding time zone by dividing it into a standard frequency time zone and a high frequency time zone in which the hot water supply frequency is higher than the standard frequency time zone,
The operation control unit sets the reference heating start temperature as the reference heating start temperature in the reference frequency time period, and sets the reference heating start temperature as the reference heating start temperature in the high frequency time period. 2. The instant hot water supply apparatus according to claim 1, wherein a high-frequency heating start temperature higher than the start temperature is set. The operation control unit adjusts the temperature of hot water in the hot water circulation circuit to the set target temperature based on the detection information of the hot water temperature detection sensor while the circulation pump is operating in the low frequency time period. 3. The instant hot water supply apparatus according to claim 1, wherein a sterilizing heat treatment is performed by heating the instant hot water heating unit to a higher sterilizing temperature. The instant hot water supply system according to any one of claims 1 to 3, wherein the time period setting unit sets the hot water supply frequency corresponding time period for each day of the week. 5. The time period setting unit according to any one of claims 1 to 4, wherein the time period setting unit learns the number of times the hot water supply state occurs for each time period, and sets the time period corresponding to the hot water supply frequency based on the learning result. Instant hot water type water heater. A pre-heating detection process in which the operation control unit detects, as the pre-heating detection temperature, the temperature detected by the hot water temperature detection sensor when the circulation pump is operated while the heating operation of the hot water heating unit is stopped. is repeatedly executed at set time intervals. 7. The instant hot water supply apparatus according to claim 6, wherein the operation control unit sets the set time interval to be longer in the low frequency time period than in the high frequency time period. A pre-heating detection process in which the operation control unit detects, as the pre-heating detection temperature, the temperature detected by the hot water temperature detection sensor when the circulation pump is operated while the heating operation of the hot water heating unit is stopped. is repeatedly executed at set time intervals, and in the high frequency time period, the set time interval is set shorter than the reference frequency time period. The instant hot water circulation circuit includes the hot water supply path, a water supply side return path connecting the hot water supply tap side end portion of the hot water supply path and the water supply path, and a connection point of the water supply side return path in the water supply path. is also composed of the water supply side downstream channel, which is the downstream side,
The hot water supply heating unit is also used as the hot water heating unit,
The instant hot water supply apparatus according to any one of claims 1 to 8, wherein the water supply temperature sensor arranged in the water supply side downstream channel is also used as the hot water temperature detection sensor. a hot water supply side return path connecting a hot water supply valve side end portion of the hot water supply path and an upstream portion of the hot water supply valve side portion of the hot water supply path, and the hot water supply side of the hot water supply path. Consists of the hot water tap side portion that is downstream of the connection point of the return path,
The circulation pump and the instant hot water heating unit are disposed in the hot water supply side return path,
The instant hot water supply apparatus according to any one of claims 1 to 8, wherein a return temperature sensor arranged in the return path on the hot water supply side is provided as the hot water temperature detection sensor.

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