JP2023120638A - Hot water supply system - Google Patents

Abstract

To supply hot water at a proper temperature when supplying hot water to a first hot water supply destination part during supply of hot water to a second hot water supply destination part, in a hot water supply system in which the first hot water supply destination part (a hot water faucet) is connected to both a first hot water supply machine and a second hot water supply machine and the second hot water supply destination part (a bathtub) is connected to the second hot water supply machine.SOLUTION: When supplying hot water to a hot water supply faucet CL while hot water is being supplied to a bathtub BTB from a second hot water supply machine 2B, operation of a flow rate regulation valve 16 of a first hot water supply machine 2A is controlled so that water for hot water supply at a target hot water supply temperature for the hot water supply faucet CL is supplied to the hot water supply faucet CL from the first hot water supply machine 2A with an on/off-valve 26 being closed irrespective of whether a prescribed condition related to necessity of hot water supply to the hot water supply faucet CL from the second hot water supply machine 2B holds or not.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a hot water supply system in which a plurality of water heaters are connected.

Conventionally, as seen in Patent Document 1, for example, a plurality of water heaters are connected in parallel between a main water supply passage through which hot water is supplied and a main hot water supply passage through which heated hot water is discharged. Hot water is supplied to one or more water heaters from the main hot water supply path, and the hot water heated by the one or more water heaters is supplied from the main hot water supply path to the hot water supply target parts such as hot water taps (common to the multiple water heaters). A system capable of supplying hot water to a hot water supply target part is known. In the system disclosed in Patent Literature 1, a flow control valve that can be closed is provided in a channel through which heated water for hot water supply flows from each water heater to a main hot water supply channel.

In such a system, one of a plurality of water heaters is usually set as a main water heater, and the other water heaters are set as auxiliary water heaters, and hot water is mainly supplied to a hot water supply target part such as a hot water tap. , carried out by the main water heater. In a situation where the capacity of the main water heater alone is insufficient, the water for hot water supply is additionally heated by the auxiliary water heater in addition to the main water heater. In addition, the flow rate control valve provided in the flow path through which the hot water supply water flows from the auxiliary water heater to the main hot water supply path is set to The valve is kept closed.

Further, in the case of individual water heaters, as seen in Patent Document 2, for example, there has been a conventional one in which heated hot water supply can be distributed and supplied to a plurality of hot water supply target parts, such as a hot water tap and a bathtub. more commonly known.

JP 2017-78518 A JP 2014-152993 A

As in the system disclosed in Patent Document 1, heated hot water is supplied from one or more water heaters of a plurality of water heaters to a hot water supply target portion (for example, a hot water tap) common to the plurality of water heaters. In the system obtained, in addition to being able to connect another hot water supply target part (for example, a bathtub) to each of one or more water heaters and supply hot water from each water heater to the common hot water supply target part, It is possible to construct a system so that hot water can be supplied from a water heater connected to the target part.

For example, at least two water heaters of a first water heater and the second water heater are provided, and the hot water supply passage of the first water heater is capable of supplying hot water to a first hot water supply target part (for example, a hot water tap). a first hot water supply target part connected to the first hot water supply target part and a hot water supply path of the second water heater so that hot water supply water can be distributed to the first hot water supply target part and a second hot water supply target part (for example, a bathtub); A hot water supply system can be configured in which a hot water supply opening/closing valve connected to the second hot water supply target portion and capable of opening and closing the hot water supply path is assembled in the hot water supply path of the second water heater.

In this case, when hot water is not being supplied from the second water heater to the second hot water supply target part, when hot water is supplied from the first water heater to the first hot water supply target part (for example, a hot water tap), When a predetermined condition regarding the necessity of auxiliary hot water supply to the hot water supply target part is satisfied (when a condition such as insufficient capacity is satisfied with only the first water heater), the first hot water supply target from the first water heater In addition to supplying hot water to the part, it is possible to supplementally supply hot water from the second water heater to the first hot water supply target part.

However, when hot water is being supplied from the second water heater to the second hot water supply target portion (for example, the bathtub), similarly to the above, there is a need for supplementary hot water supply from the second water heater to the first hot water supply target portion. The inventors of the present invention have found that the following problem occurs when auxiliary hot water is supplied from the second water heater to the first hot water supply target portion when a predetermined condition is satisfied.

That is, in a state where hot water is being supplied from the second water heater to the second hot water supply target part, when hot water is supplied to the first hot water supply target part (for example, a hot water tap), the first hot water supply target part In addition to supplying hot water, when the valve of the second water heater is opened so that hot water is supplied from the second water heater to the first hot water supply target area, the second water heater starts supplying hot water to the second hot water supply target area. A portion of the hot water supply heated for the purpose is mixed with the hot water supply heated by the first water heater and supplied to the first hot water supply target portion.

In this case, the hot water supply from the second water heater to the second hot water supply target part is performed at the target hot water supply temperature for the second hot water supply target part preset by the user, and the hot water supply from the first water heater to the first hot water supply target part is performed. When hot water is supplied at the target hot water supply temperature for the first hot water supply target portion set in advance by the user, the temperature of the hot water supply water supplied from the second water heater to the first hot water supply target portion is the temperature for the second hot water supply target portion. The temperature is controlled to the target hot water supply temperature.

Further, the temperature of the hot water supplied from the first water heater to the first hot water supply target portion is controlled to the target hot water supply temperature for the first hot water supply target portion. Therefore, the temperature of the hot water to be supplied from the first hot water supply target portion is different from the set temperatures of both the target hot water supply temperature for the first hot water supply target portion and the target hot water supply temperature for the second hot water supply target portion (both intermediate temperature).

Therefore, especially when the temperature difference between the target hot water supply temperature for the first hot water supply target part and the target hot water supply temperature for the second hot water supply target part is relatively large, hot water is supplied from the first hot water supply target part. Since the temperature of the utility water differs from both the target hot water supply temperature for the first hot water supply target part and the target hot water supply temperature for the second hot water supply target part set by the user, the user may feel uncomfortable, or hot water supply may occur. It may be misunderstood as a system failure.

The present invention has been made in view of this background. To provide a hot water supply system capable of supplying hot water at an appropriate temperature when supplying hot water to a first hot water supply target part when supplying hot water to a second hot water supply target part in a connected hot water supply system. .

In order to achieve the above object, the hot water supply system of the present invention has a water supply channel, a hot water supply channel and a heating unit, each of which heats hot water supplied through the water supply channel by the heating unit, a first water heater and a second water heater configured to discharge the heated water for hot water supply through the hot water supply passage; and a control device for controlling the operation of the first water heater and the second water heater. wherein, of the first water heater and the second water heater, the hot water supply passage of the first water heater is connected to the first hot water supply target part so as to supply hot water supply water to the first hot water supply target part. a hot water supply path of the second water heater is connected to the first hot water supply target portion and the second hot water supply target portion so as to distribute the hot water supply water to the first hot water supply target portion and the second hot water supply target portion; Further, a hot water supply system in which an on-off valve capable of opening and closing the flow path is assembled in a flow path for distributing the hot water supply water from the hot water supply path of the second water heater to the first hot water supply target part,
a flow rate adjustment valve capable of adjusting a flow rate of hot water supply water flowing from the first water heater to the first hot water supply target portion,
The control device controls the second hot water supply when hot water is being supplied from the first water heater to the first hot water supply target part in a state where hot water supply from the second water heater to the second hot water supply target part is stopped. When a predetermined condition regarding the necessity of hot water supply from the device to the first hot water supply target portion is satisfied, the hot water supply having the first target hot water supply temperature, which is the target temperature of the hot water supply water for the first hot water supply target portion, is supplied to the first hot water supply target portion. The operation of the first water heater and the flow rate adjustment valve is controlled so that hot water is supplied from the water heater to the first hot water supply target portion, and with the on-off valve opened, the second water heater is switched to the first hot water heater. 1 having a function of executing a first control process for controlling the operation of the on-off valve and the second water heater so as to supply hot water at a target hot water supply temperature to the first hot water supply target portion;
When hot water is supplied to the first hot water supply target portion in a state where the operation of the second water heater is controlled so that hot water is supplied from the second water heater to the second hot water supply target portion, the predetermined condition is satisfied. irrespective of whether or not it is established, in the state where the on-off valve is closed, hot water at a second target hot water supply temperature, which is the target temperature of hot water for the second hot water supply target portion, is supplied from the second water heater. controlling the operation of the on-off valve and the second water heater so as to supply hot water to the second hot water supply target portion, and supplying hot water at the first target hot water supply temperature from the first water heater to the first hot water supply target portion; It is characterized in that it has a function of executing a second control process for controlling the operations of the first water heater and the flow control valve so as to supply hot water (first invention).

According to the first aspect of the invention, when hot water supply from the second water heater to the second hot water supply target part is stopped and hot water is being supplied from the first water heater to the first hot water supply target part, from the second water heater In addition to supplying hot water from the first water heater to the first hot water supply target portion, by executing the first control process when a predetermined condition regarding the necessity of hot water supply to the first hot water supply target portion is satisfied, Hot water can also be supplied from the second water heater to the first hot water supply target portion. In this case, it is possible to supply hot water at the first target hot water supply temperature from both the first water heater and the second water heater.

Further, when hot water is supplied to the first hot water supply target portion in a state in which the operation of the second water heater is controlled so that hot water is supplied from the second water heater to the second hot water supply target portion, the predetermined condition is established. By executing the second control process irrespective of whether or not to Hot water can be supplied. In this case, by controlling the operation of the flow rate adjustment valve, it is possible to reduce the flow rate of the hot water to be supplied from the first water heater to the first hot water supply target part, so that the hot water at the first target hot water supply temperature is set to the second hot water supply temperature. 1 Hot water can be supplied to the hot water supply target part.

Therefore, according to the first aspect, the predetermined condition is satisfied when the first hot water supply device is supplying hot water to the first hot water supply target portion in a state where the second hot water supply device stops supplying hot water to the second hot water supply target portion. and when the operation of the second water heater is controlled so that hot water is supplied from the second water heater to the second hot water supply target portion, when hot water is supplied to the first hot water supply target portion, the predetermined Since the hot water supply having the first target hot water supply temperature can be supplied to the first hot water supply target portion regardless of whether the condition is satisfied or not, the user is prevented from feeling uncomfortable with the temperature of the hot water supply water. can.
Therefore, according to the first invention, hot water can be supplied at an appropriate temperature when hot water is supplied to the first hot water supply target portion when hot water is supplied to the second hot water supply target portion.

In the first aspect of the invention, the control device controls the operation of the second water heater so that hot water is supplied from the second water heater to the second hot water supply target portion. when the hot water supply is performed, the second control process is executed if the second target hot water supply temperature does not match the first target hot water supply temperature, and the second target hot water supply temperature matches the first target hot water supply temperature supplying water having the first target hot water temperature or the second target hot water temperature from the second water heater to the first hot water supply target portion and the second hot water supply target portion in a state in which the on-off valve is opened. and control the operation of the on-off valve and the second water heater so that hot water is supplied to the first hot water supply target portion at the first target hot water supply temperature or the second target hot water supply temperature from the first water heater. (Second invention).

In the present invention, the second target hot water supply temperature matching the first target hot water supply temperature does not necessarily mean that the second target hot water supply temperature exactly matches the first target hot water supply temperature. It may also include that the second target hot water supply temperature substantially matches (approximately matches) the first target hot water supply temperature.

According to the second invention, when hot water is supplied to the first hot water supply target portion in a state in which the operation of the second water heater is controlled so that hot water is supplied from the second water heater to the second hot water supply target portion, The second control process is executed when the second target hot water supply temperature does not match the first target hot water supply temperature, while the third control process is executed when the second target hot water supply temperature matches the first target hot water supply temperature. Since it is executed, even if the predetermined condition is satisfied, it is possible to reduce the situation in which the flow rate of hot water supply water to the first hot water supply target portion is reduced by the flow rate control valve. Therefore, it is possible to improve the convenience of the amount of hot water supplied to the first hot water supply target portion.

In the first aspect of the invention, when the first hot water supply target part is a hot water tap and the second hot water supply target part is a bathtub, the control device supplies hot water from the second water heater to the second hot water supply target part. If the second target hot water supply temperature is lower than the first target hot water supply temperature when hot water is supplied to the first hot water supply target part in a state in which the operation of the second water heater is controlled as described above, or The second control process is executed if the temperature is equal to or lower than the first target hot water supply temperature, and if the second target hot water supply temperature is equal to or higher than the first target hot water supply temperature, or the first target hot water supply temperature When the temperature is higher than the above, hot water at the first target hot water supply temperature is supplied from the second water heater to the first hot water supply target part and the second hot water supply target part in a state in which the on-off valve is opened. The first water heater controls the operation of the on-off valve and the second water heater so as to supply hot water having the first target hot water temperature from the first water heater to the first hot water supply target portion. and a fourth control process for controlling the operation of the flow control valve (third invention).

According to this, while the operation of the second water heater is being controlled so that hot water is supplied from the second water heater to the second hot water supply target part (bathtub), hot water is supplied to the first hot water supply target part (hot water tap). when the second target hot water supply temperature is lower than the first target hot water supply temperature or is equal to or lower than the first target hot water supply temperature, the second control process is executed, while the second target hot water supply temperature is executed is equal to or higher than the first target hot water supply temperature, or is higher than the first target hot water supply temperature, the fourth control process is executed. , the situation in which the flow rate of the hot water supply to the first hot water supply target portion (hot water supply valve) is reduced by the flow control valve can be reduced. Therefore, it is possible to improve the convenience of the amount of hot water supplied to the first hot water supply target portion (hot water supply valve).

Further, in the fourth control process executed when the second target hot water supply temperature is equal to or higher than the first target hot water supply temperature, or when it is higher than the first target hot water supply temperature, the second target hot water supply temperature is changed from the second water heater to the first hot water supply temperature. Since the hot water at the target hot water supply temperature is supplied to the first hot water supply target part (hot water tap) and the second hot water supply target part (bathtub), the hot water supply temperature for the second hot water supply target part (bathtub) is lower than the second target hot water supply temperature. Although the temperature rises, it is possible to perform so-called reheating after the completion of hot water supply (hot water filling) to the second hot water supply target part (bathtub). It is possible to raise the temperature of the hot water supply water to the second target hot water supply temperature.

In the third aspect of the invention, further, the control device controls the operation of the second water heater so that hot water is supplied from the second water heater to the second hot water supply target portion, and the first hot water supply target portion is When there is a request for hot water supply to the unit, if the second target hot water supply temperature matches the first target hot water supply temperature, the on-off valve is opened and the second water heater is switched from the second water heater to the first hot water supply temperature. (1) controlling the operation of the on-off valve and the second water heater so as to supply hot water at the target hot water supply temperature or the second target hot water supply temperature to the first hot water supply target portion and the second hot water supply target portion; A third for controlling the operation of the first water heater and the flow rate adjustment valve so that the first water heater supplies hot water at the first target hot water supply temperature or the second target hot water supply temperature to the first hot water supply target portion. It can be configured to execute control processing (fourth invention).

The second target hot water supply temperature matching the first target hot water supply temperature means that the second target hot water supply temperature exactly matches the first target hot water supply temperature, as in the case of the second invention. Not limited to this, it may also include that the second target hot water supply temperature substantially matches (approximately matches) the first target hot water supply temperature.

According to the fourth aspect of the invention, the third control process is executed when the second target hot water supply temperature matches the first target hot water supply temperature (including the case where they substantially match), so the predetermined condition is satisfied. Even in such a situation, it is possible to further reduce the situation in which the flow rate of the hot water supply to the first hot water supply target portion (hot water tap) is reduced by the flow control valve. Therefore, it is possible to further improve the convenience of the hot water supply flow rate for the first hot water supply target portion (hot water supply valve).

The figure which shows the whole structure of the hot water supply system of embodiment of this invention. 4 is a flowchart showing operation control processing of the main water heater (first water heater) in the first embodiment; 4 is a flowchart showing processing for controlling the operation of the auxiliary water heater (second water heater) in the first embodiment; 10 is a flow chart showing processing of operation control of the main water heater (first water heater) in the second embodiment; 10 is a flow chart showing operation control processing of the auxiliary water heater (second water heater) in the second embodiment.

[First embodiment]
A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. Referring to FIG. 1, hot water supply system 1 of the present embodiment includes a plurality of (for example, two) water heaters 2A and 2B. Each of the water heaters 2A and 2B includes a heat source device 3 having the same configuration as a heat source device for heating hot water supply water. The heat source device 3 of each of the water heaters 2A and 2B is connected to a hot water tap CL arranged in a kitchen, a washroom, a bathroom, etc., as a common hot water supply target portion. Further, a bathtub BTB is connected to the hot water supply device 2B as another hot water supply target part. In addition, in this embodiment, the bathtub is not connected to the water heater 2A.

Here, of the water heaters 2A and 2B, the water heater 2A is a main water heater for supplying hot water to the hot water tap CL, and may be hereinafter referred to as the main water heater 2A. Further, the water heater 2B is a water heater for supplementally supplying hot water to the hot water tap CL when the hot water supply capacity of the main water heater 2A alone is insufficient, and is hereinafter sometimes referred to as the auxiliary water heater 2B. . In this embodiment, the main water heater 2A corresponds to the first water heater in the present invention, and the auxiliary water heater 2B corresponds to the second water heater in the present invention. Further, the hot water tap CL and the bathtub BTB respectively correspond to the first hot water supply target portion and the second hot water supply target portion in the present invention. In the following description, the water heaters 2A and 2B are simply referred to as water heaters 2 when there is no need to distinguish between them.

The configuration of the heat source device 3 of the auxiliary water heater 2B to which the bathtub BTB is connected will be described as a representative. A first heating unit 11 that heats the supplied hot water, a hot water supply path 12 that discharges the hot water heated by the first heating unit 11, and a first heater for heating the bathtub water that is the hot water in the bathtub BTB. 2 heating unit 13, circulation water passage 14 for circulating bathtub water between second heating unit 13 and bathtub BTB, and hot water supply water heated by first heating unit 11 is supplied from hot water supply passage 12 through circulation water passage 14. and a water channel 15 for supplying hot water to the bathtub BTB.

The water supply passage 10 branches off from an upstream water supply passage 4 common to the water heaters 2A and 2B, and water for hot water supply is supplied to each of the water supply passages 10 through the upstream water supply passage 4 from a water supply source (not shown). be done. Further, the downstream side of the hot water supply passage 12 is merged with the downstream hot water supply passage 5 (the downstream hot water supply passage 5 common to the water heaters 2A and 2B) to which the hot water tap CL is connected to the downstream end. Hot water is supplied from the path 12 to the hot water tap CL through the downstream hot water supply path 5 . Although FIG. 1 shows only a single hot water tap CL, a plurality of hot water taps may be connected to the downstream hot water supply passage 5 .

Although detailed illustration is omitted, the first heating unit 11 is configured by, for example, a known combustion-type heating device including a burner and a heat exchanger. In this case, the first heating unit 11 circulates the hot water supply water supplied from the water supply path 10 to the hot water supply path 12 via the heat exchanger, and generates the hot water supply water flowing through the heat exchanger by the combustion operation of the burner. It is heated by the heat of combustion. In addition, the first heating unit 11 includes a bypass path through which hot water supply water flows from the water supply path 10 to the hot water supply path 12 without passing through the heat exchanger, and a flow rate of the hot water supply water flowing through the bypass path and the hot water supply water flowing through the heat exchanger. A bypass ratio adjusting valve may be provided for adjusting the bypass ratio, which is the ratio of the flow rate of the

The water supply passage 10 is provided with a water supply amount adjustment valve 16 for adjusting the amount of water supply, which is the flow rate of hot water flowing through the water supply passage 10, and a flow rate sensor 17 for detecting the amount of water supply. A temperature sensor 18 for detecting the temperature of the hot water supplied to the hot water tap CL or the bathtub BTB on the downstream side through the hot water supply passage 12 is assembled. The water supply amount adjustment valve 16 of the main water heater 2A corresponds to the flow rate adjustment valve in the present invention.

The circulation water channel 14 includes a return water channel 14a through which bath water flows from the bathtub BTB to the second heating unit 13, and an outbound water channel 14b through which the bathtub water flows from the second heating unit 13 into the bathtub BTB. An electric pump 19 as a power source for circulating bathtub water in the circulating water passage 14 is assembled to one of the water passages 14a and 14b, for example, the homeward water passage 14a. The ends of the return water channel 14a and the return water channel 14b on the side of the bathtub BTB are connected to a pouring port Ba formed in the side wall of the bathtub BTB near the bottom.

Although detailed illustration is omitted, the second heating section 13 is configured by, for example, a known combustion-type heating device including a burner and a heat exchanger, similarly to the first heating section 11 . In this case, the heat exchanger of the second heating unit 13 is connected to the inbound water channel 14a and the outbound water channel 14b so as to circulate the bathtub water from the inbound channel 14a to the outbound channel 14b. The second heating unit 13 is configured to heat bath water flowing through the circulation water passage 14 by the operation of the pump 19 with a heat exchanger using combustion heat generated by the combustion operation of the burner.

Supplementally, each of the first heating unit 11 and the second heating unit 13 of the heat source device 3 is not limited to a combustion-type heating device. For example, each of the first heating unit 11 and the second heating unit 13 includes an electric heating device or a heat pump type heating device instead of or in addition to the combustion heating device. may be

One of the return water channel 14a and the outbound water channel 14b, for example, the return water channel 14a, has a temperature sensor 20 for detecting the temperature of the bath water, a water flow switch 21 for detecting the presence or absence of water flow in the circulation water channel 14, and a bathtub BTB. A water level sensor 22 for detecting the water level of the bath water inside is assembled. Note that the temperature sensor 20, the water flow switch 21, and the water level sensor 22 may each be provided in the outbound water channel 14b.

The hot water supply channel 15 branches off from the hot water supply channel 12 and merges with one of the return channel 14a and the outward channel 14b of the circulation channel 14, for example, the return channel 14a. The hot water filling channel 15 is provided with a hot water filling electromagnetic valve 23 capable of opening and closing the hot water filling channel 15, and a flow rate of hot water supply (bathtub BTB A flow rate sensor 24 for detecting the pouring flow rate of molten metal is assembled.

The heat source device 3 of the auxiliary water heater 2B is configured as described above. The heat source device 3 of the main water heater 2A is also configured similarly to the auxiliary water heater 2B. Therefore, the configuration of the heat source device 3 of the main water heater 2A is denoted by the same reference numerals as those of the heat source device 3 of the auxiliary water heater 2B, and the description thereof is omitted. However, in this embodiment, a bathtub is not connected to the circulation water passage 14 of the heat source device 3 of the main water heater 2A.

Further, in the hot water supply system 1 of the present embodiment, in the hot water supply path 12 of the auxiliary water heater 2B, the flow path 12a on the downstream side of the branching portion of the hot water filling water path 15 A hot water supply opening/closing valve 26 capable of opening and closing the flow path 12a is assembled in the flow path 12a) through which hot water flows to the hot water supply plug CL. The hot water supply opening/closing valve 26 corresponds to the opening/closing valve in the present invention, and is constituted by an electromagnetic valve or the like.

Supplementally, in FIG. 1 , the hot water supply opening/closing valve 26 is provided outside the heat source device 3 of the auxiliary water heater 2B, but it may be mounted on the heat source device 3 . Moreover, the hot water supply opening/closing valve 26 may have a function of adjusting the flow rate of hot water supply water. Further, the water supply amount adjusting valve 16 may be omitted in the auxiliary water heater 2B. Further, in the main water heater 2A, instead of the water supply amount adjustment valve 16, a flow rate adjustment valve may be provided in the hot water supply path 12 in the flow path 12a on the downstream side of the branch portion of the hot water supply path 15.

Each of the water heaters 2A, 2B further includes a control device 31A, 31B having a function of controlling the operation of the heat source device 3, respectively. The controllers 31A and 31B are mounted on the heat source devices 3 of the water heaters 2A and 2B, respectively. The hot water supply system 1 also includes a kitchen remote controller 32A installed in the kitchen or the like and a bathroom remote controller 33B installed in the bathroom where the bathtub BTB is installed as remote controllers for operation.

Although detailed illustration is omitted, the kitchen remote controller 32A has a switch (ON/OFF switch) for ON/OFF operation of the hot water supply operation for supplying hot water to the hot water tap CL, and an operation switch for setting the target value of the hot water supply temperature. , an operation unit including an operation switch for instructing the execution of the hot water filling operation for filling the bathtub BTB, a display unit displaying various information regarding the operation of the water heaters 2A and 2B, and an alarm sound and voice information. and a sound generator that outputs

Although detailed illustration is omitted, the bathroom remote controller 33B includes operation switches for setting a target value for the temperature of the bathtub water in the bathtub BTB, a target value for the water level of the bathtub water, and a target value for the hot water supply temperature. An operation unit including operation switches for instructing execution of hot water refilling operation corresponding to each bathtub BTB, a display unit displaying various information related to hot water refilling, etc., and a sound output unit outputting alarm sounds and voice information and

Each of the control devices 31A and 31B is composed of one or more electronic circuit units including a processor such as a microcomputer, a memory, an interface circuit, etc., and can communicate with each other. Further, the controller 31A of the water heater 2A can communicate with the kitchen remote controller 32A, and the controller 31B of the water heater 2B can communicate with the bathroom remote controller 33B. The kitchen remote controller 32A may communicate with the controller 31B of the water heater 2B instead of or in addition to the controller 31A of the water heater 2A.

Each of the control devices 31A and 31B has a function of controlling the operation of the heat source device 3 of the corresponding water heater 2A and 2B by a function realized by the implemented hardware configuration and program (software configuration). have. The control device 31B also has a function of controlling the operation of the on-off valve 26 . However, the control device 31A may have the function of controlling the operation of the on-off valve 26. FIG.

Next, the operation of the hot water supply system 1 of this embodiment will be described. First, the basic operation of the hot water filling operation for supplying hot water (hot water filling) to the bathtub BTB will be described. The initial state immediately after the hot water supply operation is turned ON by the kitchen remote controller 32A or the bathroom remote controller 33B is the standby state of the main water heater 2A and the auxiliary water heater 2B. In this standby state, the hot water supply of the auxiliary water heater 2B is opened and closed. The valve 26 is controlled to be closed by the control device 31B. The water supply amount adjusting valves 16 of the main water heater 2A and the auxiliary water heater 2B are controlled to be fully open by the control devices 31A and 31B, respectively.

In the standby state, when the kitchen remote controller 32A or the bathroom remote controller 33B is operated to instruct the execution of the hot water filling operation for the bathtub BTB, the control device 31B of the auxiliary water heater 2B controls the opening of the hot water filling electromagnetic valve 23. Then, the operation of the first heating section 11 (the combustion operation of the burner) is started. As a result, hot water supply to the bathtub BTB is started.

Then, the control device 31B controls the heating amount of the first heating unit 11 so that the hot water supply temperature detected by the temperature sensor 18 of the auxiliary water heater 2B matches or substantially matches the target hot water supply temperature for filling the bathtub BTB. to control. In this case, as the target hot water supply temperature for filling hot water, basically, the setting temperature for filling hot water, which is the temperature most recently set by the user with the bathroom remote controller 33B (or the kitchen remote controller 32A), is used. As a result, hot water is supplied (filled with hot water) to the bathtub BTB at the set temperature. Note that the hot water filling set temperature corresponds to the second target hot water supply temperature in the present invention.

The control device 31B calculates the amount of hot water required to raise the water level of the bathtub water in the bathtub BTB to the set water level which is the latest target value set by the bathroom remote controller 33B (or the kitchen remote controller 32A). Then, the control device 31B continues to supply hot water to the bathtub BTB until the amount of hot water supplied to the bathtub BTB (integrated flow rate) detected based on the output of the flow rate sensor 24 of the hot water supply channel 15 reaches the calculated necessary amount of hot water. , when the required amount of hot water is reached, the operation of the first heating unit 11 is stopped. The electromagnetic valve 23 for filling hot water is controlled to be closed. This completes the filling of the bathtub BTB with hot water up to the set water level.

After that, the control device 31B determines whether or not the temperature of the bathtub water detected by the temperature sensor 20 of the auxiliary water heater 2B has reached the hot water filling set temperature as the target hot water supply temperature for hot water filling. Then, if the determination result is negative due to the bathtub water remaining in the bathtub BTB at the start of the hot-water filling operation, the control device 31B controls the second heating of the auxiliary water heater 2B. By operating the unit 13 and the pump 19, the bathtub water in the bathtub BTB is heated while being circulated through the circulating water passage 14 until the detected value of the temperature of the bathtub water reaches the set temperature of the hot water filling. fire).
In the hot water supply system 1 of the present embodiment, the hot water filling operation for filling the bathtub BTB is performed as described above while the hot water supply opening/closing valve 26 of the auxiliary water heater 2B is closed.

Next, the operation for supplying hot water to the hot water tap CL will be described with reference to FIGS. 2 and 3. FIG. In the following description, unless otherwise specified, "hot water filling operation" means the operation in the process of filling the bathtub BTB with hot water, and does not include the operation in the process of reheating that can be performed after that. Make it not exist.

The control device 31A of the main water heater 2A executes the control process shown in the flowchart of FIG. 2 regarding the hot water supply to the hot water tap CL. In the standby state of the main water heater 2A, in STEP 1, the control device 31A performs a determination process for determining whether or not water supply to the hot water tap CL has been started until the determination result becomes affirmative.

Here, by opening the hot water supply valve CL, the hot water supply valve passes from the upstream side water supply path 4 through the water supply path 10, the first heating unit 11 and the hot water supply path 12 of the main water heater 2A, and the downstream side hot water supply path 5. Water flow to CL is started. Then, in STEP 1, the control device 31A determines whether or not the water supply to the hot water tap CL has started, depending on whether or not the flow rate detected by the flow rate sensor 17 of the main water heater 2A is equal to or greater than a predetermined flow rate. .

When the determination result in STEP1 becomes affirmative due to the start of water supply to the hot water tap CL, the control device 31A causes the main water heater 2A to start the hot water supply operation in STEP2. In this case, the hot water supply operation for supplying hot water from the main water heater 2A to the hot water tap CL is started by starting the operation of the first heating unit 11 of the main water heater 2A (burner combustion operation).

In this hot water supply operation, the controller 31A controls the first heating unit 11 so that the hot water supply temperature detected by the temperature sensor 18 of the main water heater 2A matches or substantially matches the target hot water supply temperature, which is its target value. By controlling the amount of heating (the amount of combustion of the burner), the temperature of the hot water supplied to the hot water tap CL is controlled. In this case, as the target hot water supply temperature, the set hot water supply temperature, which is the temperature most recently set by the user with kitchen remote controller 32A or bathroom remote controller 33B, is used for supplying hot water to hot water tap CL. As a result, hot water is supplied to the hot water tap CL at the set hot water supply temperature. Note that the hot water supply set temperature corresponds to the first target hot water supply temperature in the present invention.

Next, in STEP 3, the control device 31A determines whether or not the water supply to the hot water tap CL has been stopped (whether or not the hot water tap CL has been closed). In this case, the control device 31A determines whether or not the water supply to the hot water tap CL has been stopped depending on whether or not the flow rate detected by the flow rate sensor 17 of the main water heater 2A has become equal to or less than a predetermined flow rate.

If the determination result in STEP3 is affirmative (when the water supply to the hot water tap CL is stopped), the control device 31A stops the operation of the first heating section 11 of the main water heater 2A in STEP10. . As a result, the hot water supply operation of the main water heater 2A is stopped.

If the determination result in STEP 3 is negative (if the water supply to the hot water tap CL continues), the control device 31A, in STEP 4, causes the hot water supply to be supplied to the hot water tap CL up to the hot water supply set temperature. It is determined whether or not the amount of hot water supply, which is the amount of heat required to raise the temperature, is greater than the upper limit amount of heat, which is the upper limit of the amount of heat that can be input from the first heating unit 11 of the main water heater 2A to the hot water supply water.

Here, the hot water supply heat amount is calculated by multiplying the difference between the hot water supply set temperature and the water supply temperature (the temperature of the hot water supply water flowing through the water supply passage 10 of the main water heater 2A) by the hot water supply flow rate to the hot water tap CL. The water supply temperature is detected by a temperature sensor (not shown), or estimated from the flow rate detected by the flow sensor 17, the hot water supply temperature detected by the temperature sensor 18, the set value of the heating amount of the first heating unit 11, and the like. can be As the hot water supply flow rate to the hot water tap CL, the flow rate detected by the flow sensor 17 of the main water heater 2A can be used.

Supplementally, in the present embodiment, the fact that the determination result in STEP 4 is affirmative (heat amount of hot water supply>upper limit heat amount) is the predetermined condition in the present invention (the requirement for supplying hot water from the auxiliary water heater 2B to the hot water tap CL). (predetermined condition regarding no) is satisfied.

If the determination result in STEP4 is negative (when the hot water supply heat quantity≦the upper limit heat quantity), the control device 31A repeats the processing from STEP3. On the other hand, when the flow rate of hot water supply to the hot water tap CL is large, the determination result in STEP 4 becomes affirmative (heat amount of hot water supply>upper limit heat amount). In this case, the control device 31A next determines in STEP5 whether or not the auxiliary water heater 2B is in the process of refilling hot water. In this case, through communication between the control device 31A and the control device 31B of the auxiliary water heater 2B, information indicating whether or not the hot water filling operation is being executed in the auxiliary water heater 2B is acquired.

If the determination result in STEP5 is negative (if the hot water filling operation is not being executed in the auxiliary water heater 2B), the control device 31A instructs the control device 31B of the auxiliary water heater 2B in STEP6 to to the hot water tap CL to start supplementary hot water supply. In response to this, auxiliary hot water supply from the auxiliary water heater 2B to the hot water tap CL is started as will be described later. As a result, the flow rate of the hot water supply flowing into the water supply passage 10 of the main water heater 2A from the upstream water supply passage 4 is reduced, so that the temperature of the hot water supply can be raised to the hot water supply set temperature by the main water heater 2A. Become.

Next, in STEP7, the control device 31A determines whether or not the supply of water to the hot water tap CL is stopped in the same manner as in STEP3. If the result of this determination is affirmative (when the water supply to the hot water tap CL is stopped), in STEP 12, the control device 31A requests the control device 31B of the auxiliary water heater 2B to stop supplying hot water. , in STEP 10 described above, the operation of the first heating unit 11 of the main water heater 2A is stopped.

Further, when the determination result in STEP7 is negative (when water supply to the hot water tap CL continues), the control device 31A, in STEP8, determines that the hot water supply heat amount is higher than the upper limit heat amount of the main water heater 2A. It is determined whether or not the heat quantity has decreased to a value equal to or less than the heat quantity lower by a predetermined amount α (=upper limit heat quantity−α). In this case, the heat amount of hot water supply is calculated by multiplying the difference between the set hot water supply temperature and the water supply temperature by the flow rate of hot water supply to the hot water tap CL. The flow rate of hot water supplied to the hot water tap CL is calculated as the total flow rate of the flow rate detected by the flow rate sensor 17 of the main water heater 2A and the flow rate detected by the flow rate sensor 17 of the auxiliary water heater 2B. Note that the control device 31A acquires the flow rate detected by the flow rate sensor 17 of the auxiliary water heater 2B through communication with the control device 31B.

If the determination result in STEP8 is negative (when the hot water supply heat amount>the upper limit heat amount−α), the control device 31A repeats the processing from STEP7. Further, when the determination result in STEP8 is affirmative (when hot water supply heat amount≦upper limit heat amount−α), in STEP9, the control device 31A requests the control device 31B of the auxiliary water heater 2B to stop hot water supply. Then, the processing from STEP 3 described above is repeated. In this case, the process from STEP 3 is repeated while the supply of hot water from the auxiliary water heater 2B to the hot water tap CL is stopped.

On the other hand, if the determination result in STEP 5 is affirmative, that is, if the hot water supply heat amount>the upper limit heat amount is satisfied and the auxiliary water heater 2B is executing the hot water filling operation, the control device 31A controls the auxiliary hot water supply. Without requesting the control device 31B of the device 2B to start hot water supply, in STEP 11, the amount of hot water supplied to the hot water tap CL is adjusted by controlling the operation of the water supply amount adjustment valve 16 of the main water heater 2A.

In this case, the control device 31B reduces the amount of hot water supplied to the hot water tap CL so as to satisfy the condition that the hot water supply heat amount≦the upper limit heat amount. Then, the control device 31A repeats the processing from STEP3. As a result, hot water can be supplied to the hot water tap CL at the hot water supply set temperature without auxiliary hot water supply from the auxiliary water heater 2B to the hot water tap CL.

In parallel with the execution of the process in the main water heater 2A as described above, the control process shown in the flowchart of FIG. 3 is executed in the auxiliary water heater 2B by the control device 31B.
In the closed state of the hot water supply opening/closing valve 26 of the auxiliary water heater 2B, the control device 31B determines in STEP 21 whether or not the auxiliary water heater 2B is in the process of filling hot water. If there is, the hot water supply opening/closing valve 26 is kept closed in STEP26, and the determination process of STEP21 is repeated. Therefore, when the auxiliary water heater 2B is in the process of filling hot water, supplementary hot water supply from the auxiliary water heater 2B to the hot water tap CL is not performed.

If the determination result in STEP 21 is negative (if the hot water filling operation is not in progress), the control device 31B determines in STEP 22 whether or not there is a request to start hot water supply from the control device 31A of the main water heater 2A. If the result of this determination is negative, the processing from STEP 21 is repeated via STEP 26 (with the hot water supply opening/closing valve 26 kept closed).

If the result of determination in STEP22 is affirmative (if there is a request to start hot water supply), if the result of determination in STEP4 is affirmative ( hot water supply heat amount>upper limit heat amount). In this case, in STEP 23, the control device 31B controls the hot water supply opening/closing valve 26 to start the hot water supply operation of the auxiliary water heater 2B.

In this hot water supply operation, the control device 31B heats the first heating unit 11 so that the hot water supply temperature detected by the temperature sensor 18 of the auxiliary water heater 2B matches or substantially matches the hot water supply set temperature as the target value. By controlling the amount (the combustion amount of the burner), the temperature control of the hot water supplied from the auxiliary water heater 2B to the hot water tap CL is performed. As a result, the hot water supply from the auxiliary water heater 2B to the hot water tap CL is performed at the hot water supply set temperature in parallel with the hot water supply from the main water heater 2A to the hot water tap CL.

Furthermore, in STEP 24, the control device 31B repeats the process of determining whether or not there is a request to stop supplying hot water from the control device 31A of the main water heater 2A until the determination result becomes affirmative. Then, when the determination result in STEP 24 becomes affirmative (when a hot water supply stop request is received from the control device 31A), the control device 31B controls the hot water supply opening/closing valve 26 of the auxiliary water heater 2B to close in STEP 25. 1 Stop the operation of the heating unit 11 . As a result, auxiliary hot water supply from the auxiliary water heater 2B to the hot water tap CL is stopped.

In the present embodiment, with respect to the hot water supply to the hot water tap CL, the operation control of the main water heater 2A and the auxiliary water heater 2B is performed as described above, so that the auxiliary hot water supply is When the condition of hot water heat amount>upper limit heat amount as a predetermined condition regarding the necessity of hot water supply from the water heater 2B to the hot water tap CL is established, in addition to hot water supply from the main water heater 2A to the hot water tap CL, the auxiliary water heater 2B Auxiliary hot water supply is performed from the hot water tap CL.

In this case, since the hot water supply from the main water heater 2A to the hot water tap CL and the hot water supply from the auxiliary water heater 2B to the hot water tap CL are both performed at the hot water supply set temperature, the user sets the hot water supply temperature to the hot water tap CL. It is possible to prevent feeling discomfort.

Further, during execution of the hot water filling operation in the auxiliary water heater 2B, it is determined whether or not the condition of hot water supply heat amount > upper limit heat amount as a predetermined condition regarding whether or not hot water supply from the auxiliary water heater 2B to the hot water tap CL is satisfied. Therefore, the hot water supply opening/closing valve 26 of the auxiliary water heater 2B is kept closed, and auxiliary hot water supply from the auxiliary water heater 2B to the hot water tap CL is not performed.

In this case, in the main water heater 2A, the amount of hot water supplied to the hot water tap CL is reduced by controlling the operation of the water supply amount adjustment valve 16, so that the hot water supply to the hot water tap CL can be performed at the hot water supply set temperature. Therefore, it is possible to prevent the user from feeling uncomfortable with the temperature of the hot water supplied to the hot water tap CL. Further, in this case, the auxiliary water heater 2B can continuously supply hot water (hot water filling) to the bathtub BTB at the hot water filling set temperature until completion of hot water filling.
[Second embodiment]

Next, a second embodiment of the invention will be described with reference to FIGS. 4 and 5. FIG. Note that the present embodiment differs from the first embodiment only in the control processing of each of the main water heater 2A and the auxiliary water heater 2B regarding hot water supply to the hot water tap CL. The description of is omitted.

The control device 31A of the main water heater 2A executes the control process from STEP31 shown in the flowchart of FIG. 4 regarding the hot water supply to the hot water tap CL. In this case, the processing of STEPs 31-40 and 44 is the same as the processing of STEPs 1-10 and 12 in the first embodiment.

Then, in the present embodiment, when the determination result in STEP34 is affirmative (when the condition of hot water supply heat amount > upper limit heat amount is satisfied), when the determination result in STEP35 is affirmative (hot water is supplied by the auxiliary water heater 2B) (when beam operation is being performed) is different from that of the first embodiment.

Specifically, when the determination result in STEP35 is affirmative, the control device 31A determines in STEP41 whether or not the set temperature for filling hot water in the bathtub BTB matches the set hot water supply temperature. Here, in the present embodiment, the statement that the hot water filling set temperature matches the hot water supply set temperature is not limited to the case where the hot water filling set temperature exactly matches the hot water supply set temperature, but the case where the hot water supply set temperature substantially matches the hot water supply set temperature. include. Therefore, in STEP 41, the control device 31A determines whether or not the absolute value of the difference between the hot water filling set temperature and the hot water supply set temperature is a minute value equal to or less than a predetermined threshold value, so that the hot water filling set temperature matches the hot water supply set temperature. decide whether to

Then, if the determination result in STEP 41 is affirmative (if the hot water filling set temperature matches (or nearly matches) the hot water supply set temperature), the control device 31A executes the processing from STEP 36 . As a result, in addition to hot water supply from the main water heater 2A to the hot water tap CL, auxiliary hot water supply from the auxiliary water heater 2B to the hot water tap CL is performed.

Further, if the determination result in STEP 41 is negative (if the absolute value of the difference between the hot water filling set temperature and the hot water supply set temperature exceeds a predetermined threshold value), the control device 31A, in STEP 42, sets the hot water filling set temperature is higher than the hot water supply set temperature. Then, if the determination result in STEP 42 is affirmative (when the hot water filling set temperature > the hot water supply set temperature), the control device 31A performs the processing from STEP 36 in the same manner as when the determination result in STEP 41 is affirmative. to run. As a result, in addition to hot water supply from the main water heater 2A to the hot water tap CL, auxiliary hot water supply from the auxiliary water heater 2B to the hot water tap CL is performed.

If the determination result in STEP 42 is negative (if the absolute value of the difference between the hot water supply set temperature and the hot water supply set temperature exceeds a predetermined threshold and if the hot water supply set temperature<the hot water supply set temperature), The control device 31A does not request the control device 31B of the auxiliary water heater 2B to start supplying hot water, and in STEP 43, controls the operation of the water supply amount adjustment valve 16 of the main water heater 2A, so that the hot water supply valve is closed. Adjust the amount of hot water supplied to CL.

In this case, similarly to STEP 11 in the first embodiment, the operation control of the water supply amount adjustment valve 16 of the main water heater 2A is performed so as to decrease the amount of hot water supplied to the hot water tap CL. Then, the control device 31A repeats the processing from STEP33. As a result, hot water can be supplied to the hot water tap CL at the hot water supply set temperature without auxiliary hot water supply from the auxiliary water heater 2B to the hot water tap CL.

In parallel with the execution of the process in the main water heater 2A as described above, the control process shown in the flowchart of FIG. 5 is executed in the auxiliary water heater 2B by the control device 31B.
In the closed state of the hot water supply opening/closing valve 26 of the auxiliary water heater 2B, the control device 31B determines in STEP 51 whether or not the auxiliary water heater 2B is executing the hot water filling operation. If there is (when the hot water filling operation is being executed), in STEP 58, it is determined whether or not there is a request to start hot water supply from the controller 31A of the main water heater 2A.

If the determination result in STEP58 is negative (if there is no request to start hot water supply), the control device 31A keeps the hot water supply opening/closing valve 26 closed in STEP59, and repeats the processing from STEP51. If the determination result in STEP 58 is affirmative (if a request to start hot water supply is received), in STEP 60, the control device 31A sets the hot water filling temperature as the target hot water supply temperature for supplying hot water (hot water filling) to the bathtub BTB. After changing the set temperature to the hot water supply set temperature, the process from STEP 53 to be described later is executed.

If the determination result in STEP51 is negative (if the hot water filling operation is stopped), the control device 31A checks in STEP52 whether or not there is a request to start hot water supply from the control device 31A of the main water heater 2A. If the result of this determination is negative (if there is no request to start hot water supply), the processing from STEP 51 is repeated through STEP 59 (with the hot water supply opening/closing valve 26 kept closed). .

If the result of determination in STEP 52 is affirmative (if there is a request to start hot water supply), if the result of determination in STEP 34 is affirmative ( hot water supply heat amount>upper limit heat amount). Further, when the process of STEP 60 is executed, the determination result of STEP 34 becomes affirmative (hot water supply heat amount>upper limit heat amount) while the hot water filling operation is being executed in the auxiliary water heater 2B, and the STEP 41 or This is when the determination result of 42 is affirmative (when the set temperature for filling hot water matches (or nearly matches) the set temperature for supplying hot water, or when the set temperature for filling hot water is higher than the set temperature for hot water supply).

In these cases, in STEP 53, the control device 31A controls the opening of the hot water supply opening/closing valve 26 and starts the hot water supply operation of the auxiliary water heater 2B. In this hot water supply operation, the controller 31B controls the heating amount of the first heating unit 11 so that the hot water supply temperature detected by the temperature sensor 18 of the auxiliary water heater 2B matches or substantially matches the hot water supply set temperature as the target value. By controlling (the amount of combustion of the burner), the temperature of the hot water supplied from the auxiliary water heater 2B to the hot water tap CL is controlled. As a result, the hot water supply from the auxiliary water heater 2B to the hot water tap CL is performed at the hot water supply set temperature in parallel with the hot water supply from the main water heater 2A to the hot water tap CL.

Here, in the hot water supply operation of the auxiliary water heater 2B after the processing of STEP60, the hot water filling operation (filling the bathtub BTB with hot water) is also performed in parallel. In this case, hot water is supplied to the bathtub BTB, the temperature of which is the same as the hot water supply temperature from the auxiliary water heater 2B to the hot water tap CL (=hot water supply set temperature). Therefore, when the determination result of STEP 41 is affirmative, the temperature of the hot water filling in the bathtub BTB matches the original setting temperature of the hot water filling (the temperature set by the user with the kitchen remote control 32A or the bathroom remote control 33B). (including temperatures that are substantially the same), and if the determination result in STEP 42 is affirmative, the hot water filling is performed at a temperature lower than the original set temperature.

Further, in STEP 54, the control device 31B repeats the process of determining whether or not there is a hot water supply stop request from the control device 31A of the main water heater 2A until the determination result becomes affirmative. Then, when the determination result in STEP54 becomes affirmative (when a hot water supply stop request is received from the control device 31A), the control device 31B controls in STEP55 to close the hot water supply opening/closing valve 26 of the auxiliary water heater 2B. As a result, auxiliary hot water supply from the auxiliary water heater 2B to the hot water tap CL is stopped.

Further, in STEP 56, the control device 31B determines whether or not the auxiliary water heater 2B is in the process of filling hot water. ), the operation of the first heating unit 11 is stopped in STEP 57 .

If the determination result in STEP 56 is affirmative (if the hot water filling operation is in progress), the control device 31B changes the hot water filling set temperature to the original temperature (kitchen remote controller 32A or bathroom remote controller 33B) in STEP 61. ), the process from STEP 51 is executed. In this case, the hot water supply (hot water filling) to the bathtub BTB is performed at the original hot water filling set temperature.

In the present embodiment, with respect to the hot water supply to the hot water tap CL, the operation control of the main water heater 2A and the auxiliary water heater 2B is performed as described above, so that the auxiliary hot water supply is When the condition of hot water heat amount>upper limit heat amount as a predetermined condition regarding the necessity of hot water supply from the water heater 2B to the hot water tap CL is established, in addition to hot water supply from the main water heater 2A to the hot water tap CL, the auxiliary water heater 2B Auxiliary hot water supply is performed from the hot water tap CL.

In this case, since the hot water supply from the main water heater 2A to the hot water tap CL and the hot water supply from the auxiliary water heater 2B to the hot water tap CL are both performed at the hot water supply set temperature, the user sets the hot water supply temperature to the hot water tap CL. It is possible to prevent feeling discomfort.

During the hot water refilling operation in the auxiliary water heater 2B, except when the determination result in STEP 41 or 42 is affirmative, a predetermined amount regarding the necessity of supplying hot water from the auxiliary water heater 2B to the hot water tap CL is set. The hot water supply opening/closing valve 26 of the auxiliary water heater 2B is kept closed regardless of whether or not the condition of hot water supply heat amount>upper limit heat amount is satisfied, and auxiliary water supply from the auxiliary water heater 2B to the hot water tap CL is maintained. No hot water is supplied.

In this case, in the main water heater 2A, the amount of hot water supplied to the hot water tap CL is reduced by controlling the operation of the water supply amount adjustment valve 16, so that the hot water supply to the hot water tap CL can be performed at the hot water supply set temperature. Therefore, it is possible to prevent the user from feeling uncomfortable with the temperature of the hot water supplied to the hot water tap CL. Further, in this case, the auxiliary water heater 2B can continuously supply hot water (hot water filling) to the bathtub BTB at the hot water filling set temperature until completion of hot water filling.

Further, even during the hot water refilling operation in the auxiliary water heater 2B, if the condition of hot water supply heat quantity > upper limit heat quantity is established in a state where the determination result in STEP 41 or 42 is affirmative, the hot water refilling operation is performed. In addition to the hot water supply from the main water heater 2A to the hot water tap CL, supplementary hot water supply from the auxiliary water heater 2B to the hot water tap CL is performed in the same manner as when the operation is stopped. Therefore, the process of STEP 43 can reduce the situation in which the flow rate of hot water supply to the hot water tap CL is reduced. As a result, it is possible to improve convenience regarding the flow rate of hot water supplied to the hot water tap CL.

Further, in this case, both the hot water supply from the main water heater 2A to the hot water tap CL and the hot water supply from the auxiliary water heater 2B to the hot water tap CL are performed at the hot water supply set temperature. It is possible to prevent the user from feeling uncomfortable with the temperature.

Furthermore, in this case, when the hot water filling of the bathtub BTB is affirmative (when the hot water filling setting temperature matches the hot water setting temperature), the hot water filling setting temperature (kitchen remote control 32A or It can be performed at a temperature that matches (including a temperature that almost matches) the temperature set by the user using the bathroom remote controller 33B.

Further, when the determination result in STEP 42 is affirmative (when the hot water filling set temperature > the hot water supply set temperature), hot water is filled into the bathtub BTB at a temperature lower than the original hot water filling set temperature. However, the bath water can be heated up to the setting temperature of the hot water bath by the reheating process after the hot water bath.

[Other embodiments]
It should be noted that the present invention is not limited to the above-described embodiments, and other embodiments can be employed. Some other embodiments are exemplified below.
Although the hot water supply system 1 in which the main water heater 2A is not connected to the bathtub is illustrated in the first and second embodiments, the main water heater 2A may also be connected to the bathtub. Even in this case, when hot water is supplied to the hot water tap CL while the hot water filling operation of the main water heater 2A is stopped, the main water heater 2A and the auxiliary water heater are similar to the first embodiment or the second embodiment. By performing the operation control of 2B, the same effects as those of the first embodiment or the second embodiment can be obtained.

Further, in the second embodiment, one of STEPs 41 and 42 may be omitted. Then, for example, in the case where the processing of STEP 41 is omitted, it is determined in STEP 42 whether or not the hot water filling set temperature≧the hot water supply installation temperature, and if the determination result is affirmative (hot water filling set temperature=hot water supply set temperature ), the hot water supply operation with the auxiliary water heater 2B is executed, and if the result is negative (when the hot water supply set temperature < the hot water supply set temperature), the hot water supply operation with the auxiliary water heater 2B is performed. It may not be executed (the process of STEP 43 may be executed).

Further, when the determination result in STEP 41 is affirmative (when the set temperature of the hot water supply matches the set temperature of the hot water supply (including the case where it almost matches)), the hot water supply to the hot water tap CL and the hot water supply to the bathtub BTB (hot water supply ) may be executed with a hot water supply set temperature that matches (or nearly matches) the hot water supply set temperature as the target hot water supply temperature.

Further, in the first embodiment, during the hot water filling operation in the auxiliary water heater 2B, even if the heat quantity of hot water supply>the upper limit heat quantity, the control device 31B of the auxiliary water heater 2B is not requested to start hot water supply. Thus, in the second embodiment, when the auxiliary water heater 2B is in the process of filling hot water and the judgment results in STEPs 41 and 42 are negative, the heat quantity of hot water supply>the upper limit heat quantity. Even in this situation, the controller 31A of the main water heater 2A does not request the controller 31B of the auxiliary water heater 2B to start supplying hot water. However, in these situations, while the control device 31A of the main water heater 2A requests the control device 31B of the auxiliary water heater 2B to start supplying hot water, the auxiliary water heater 2B ignores the request (even if the request is made, The hot water supply opening/closing valve 26 may be kept closed).

In addition, in the above-described first and second embodiments, the case where the first hot water supply target part and the second hot water supply target part in the present invention are the hot water tap CL and the bathtub BTB, respectively, is illustrated. The first hot water supply target portion and the second hot water supply target portion may be different from those described above. For example, the second hot water supply target part is a hot water tap different from the hot water tap CL, or It may be a dishwasher or the like.

In the first embodiment and the second embodiment, the controllers 31A and 31B correspond to the controllers of the present invention. good too. Further, for example, a control device higher than the control devices 31A and 31B is further provided, and the higher control device is the control device 31A. A part of the processing of 31B may be executed.

Moreover, in the first and second embodiments, the hot water supply system 1 including only two water heaters 2A and 2B was illustrated, but the present invention can also be applied to a hot water supply system including three or more water heaters. For example, the same control processing as in the first embodiment and the second embodiment can be adopted for controlling the operation of two water heaters out of three or more water heaters.

1 Hot water supply system 2A Main water heater (first water heater) 2B Auxiliary water heater (second water heater) 10 Water supply path 11 First heating unit (heating unit) 12 Hot water supply path 16... Water supply amount adjustment valve (flow rate adjustment valve), 26... Hot water supply opening/closing valve (open/close valve), 31A, 31B... Control device, CL... Hot water tap (first hot water supply target part), BTB... Bathtub (second hot water supply target part) ).

Claims (4)

A water supply path, a hot water supply path, and a heating section are provided, each of which heats hot water supplied through the water supply path by the heating section and discharges the heated hot water supply through the hot water supply path. a first water heater and a second water heater configured, and a control device for controlling the operation of the first water heater and the second water heater, wherein the first water heater and the second water heater a hot water supply passage of the first water heater is connected to the first hot water supply target portion so as to supply the hot water supply water to the first hot water supply target portion; connected to the first hot water supply target portion and the second hot water supply target portion so as to be distributed to the first hot water supply target portion and the second hot water supply target portion; A hot water supply system in which an on-off valve capable of opening and closing the flow path is assembled in the flow path for distributing the hot water supply water to the part,
a flow rate adjustment valve capable of adjusting a flow rate of hot water supply water flowing from the first water heater to the first hot water supply target portion,
The control device controls the second hot water supply when hot water is being supplied from the first water heater to the first hot water supply target part in a state where hot water supply from the second water heater to the second hot water supply target part is stopped. When a predetermined condition regarding the necessity of hot water supply from the device to the first hot water supply target portion is satisfied, the hot water supply having the first target hot water supply temperature, which is the target temperature of the hot water supply water for the first hot water supply target portion, is supplied to the first hot water supply target portion. The operation of the first water heater and the flow rate adjustment valve is controlled so that hot water is supplied from the water heater to the first hot water supply target portion, and with the on-off valve opened, the second water heater is switched to the first hot water heater. 1 having a function of executing a first control process for controlling the operation of the on-off valve and the second water heater so as to supply hot water at a target hot water supply temperature to the first hot water supply target portion;
When hot water is supplied to the first hot water supply target portion in a state where the operation of the second water heater is controlled so that hot water is supplied from the second water heater to the second hot water supply target portion, the predetermined condition is satisfied. irrespective of whether or not it is established, in the state where the on-off valve is closed, hot water at a second target hot water supply temperature, which is the target temperature of hot water for the second hot water supply target portion, is supplied from the second water heater. controlling the operation of the on-off valve and the second water heater so as to supply hot water to the second hot water supply target portion, and supplying hot water at the first target hot water supply temperature from the first water heater to the first hot water supply target portion; A hot water supply system characterized by having a function of executing a second control process for controlling operations of the first water heater and the flow control valve so as to supply hot water. In the hot water supply system according to claim 1,
When the control device supplies hot water to the first hot water supply target part in a state in which the operation of the second water heater is controlled so that hot water is supplied from the second water heater to the second hot water supply target part, When the second target hot water supply temperature does not match the first target hot water supply temperature, the second control process is executed, and when the second target hot water supply temperature matches the first target hot water supply temperature, the on-off valve With the valve opened, hot water supply water having the first target hot water supply temperature or the second target hot water supply temperature is supplied from the second water heater to the first hot water supply target part and the second hot water supply target part. The operation of the on-off valve and the second water heater is controlled, and hot water supply water having the first target hot water supply temperature or the second target hot water supply temperature is supplied from the first water heater to the first hot water supply target part. A hot water supply system configured to execute a third control process for controlling the operation of the first water heater and the flow control valve. In the hot water supply system according to claim 1,
The first hot water supply target part is a hot water tap, the second hot water supply target part is a bathtub,
When the control device supplies hot water to the first hot water supply target part in a state in which the operation of the second water heater is controlled so that hot water is supplied from the second water heater to the second hot water supply target part, When the second target hot water supply temperature is lower than the first target hot water supply temperature, or when the temperature is equal to or lower than the first target hot water supply temperature, the second control process is executed, and the second target hot water supply temperature is the above When the temperature is equal to or higher than the first target hot water supply temperature, or when the temperature is higher than the first target hot water supply temperature, the first target hot water supply temperature is changed from the second water heater to the first target hot water supply temperature while the on-off valve is opened. hot water supply to the first hot water supply target portion and the second hot water supply target portion; A hot water supply system configured to execute a fourth control process for controlling the operations of the first water heater and the flow rate adjustment valve so as to supply hot water to the first hot water supply target part. . In the hot water supply system according to claim 3,
The control device generates a request for hot water supply to the first hot water supply target part in a state in which the operation of the second water heater is controlled so that hot water is supplied from the second water heater to the second hot water supply target part. When the second target hot water supply temperature matches the first target hot water supply temperature, the second target hot water supply temperature or the second The operation of the on-off valve and the second water heater is controlled so that hot water having a target hot water supply temperature is supplied to the first hot water supply target portion and the second hot water supply target portion, and the operation of the first water heater to the first water heater is controlled. configured to execute a third control process for controlling the operations of the first water heater and the flow rate adjustment valve so as to supply hot water at the target hot water supply temperature or the second target hot water supply temperature to the first hot water supply target portion A hot water supply system characterized by:

Images