JP4476840B2 - Hot water mixing unit and hot water supply system equipped with the same - Google Patents

Description

  The present invention relates to a hot water supply system capable of simultaneously supplying hot water discharged from a water heater to a plurality of hot water destinations such as a kitchen, a bathroom, and a washroom, and hot water mixing used as a component of the hot water system. Regarding the unit.

  Conventionally, as a specific example of a hot water supply system, there is one described in Patent Document 1. The hot water supply system described in this document is a combination of a hot water supply device and a hot water mixing unit, and the hot water mixing unit adjusts the temperature by mixing water with hot water discharged from the hot water supply device. It has a plurality of hot and cold water mixing valves. In addition, a remote controller is connected to the hot water heater and the hot water mixing unit, and the remote controller can set a target hot water supply temperature for each hot water supply destination such as a kitchen, a bathroom, and a washroom. According to the hot water supply system having such a configuration, when hot water is supplied from the water heater to the hot / cold water mixing unit, it is possible to generate hot water of different temperatures using a plurality of hot water / water mixing valves. Therefore, hot water having a target hot water temperature set by the remote controller can be simultaneously supplied to a plurality of hot water supply destinations such as a kitchen, a bathroom, and a bathroom.

  The water heater of the hot water supply system is configured to determine whether or not the hot water / water mixing unit is connected to the water heater based on the presence / absence of communication with the hot water / water mixing unit. When the hot water heater determines that the hot water mixing unit is connected, the hot water temperature from the hot water heater is set to be higher than the maximum target hot water temperature set by the remote controller. It has become. On the other hand, when it is determined that the hot water / water mixing unit is not connected, the water heater adjusts the hot water temperature by using a mixing valve of the water heater itself. According to such a configuration, the water heater can be used both when the hot and cold water mixing unit is connected and when it is not connected.

  However, in the prior art, unlike the hot water heater, the hot water mixing unit can be used only for a dedicated hot water heater, as described below, and lacks flexibility in use. It was.

  That is, when a user intends to install a hot water supply system equipped with a hot and cold water mixing unit, the user often does not own the hot water and water mixing unit but already owns the hot water heater. In such a case, instead of purchasing all the components of the hot water supply system, the existing hot water heater owned by the user is used effectively, and only the hot water mixing unit is purchased to construct a hot water supply system. It is desirable to be able to do so. However, the conventional hot and cold water mixing unit is designed to perform specific communication with a hot water heater, and it is difficult to use it appropriately in combination with a hot water heater whose communication function is not suitable. Therefore, when the water heater owned by the user does not have a communication function suitable for the hot water mixing unit, the hot water heater can no longer be used effectively, resulting in a wasteful problem. In addition, the user can freely select the type of water heater even if he / she purchases all the components of the hot water supply system and constructs the hot water supply system instead of purchasing only the hot water / water mixing unit. You may want to However, in the prior art, as described above, it is necessary for the water heater to be able to communicate with the hot water mixing unit, so that it is impossible to appropriately meet such a demand. It was.

JP 2003-83603 A

  The present invention has been conceived under such circumstances and can be combined with various water heaters regardless of whether or not the water heater to be combined has a suitable communication function. An object of the present invention is to provide a hot and cold water mixing unit that can be suitably used and excellent in use flexibility, and a hot water supply system including the hot water and water mixing unit.

  In order to solve the above problems, the present invention takes the following technical means.

  The hot and cold water mixing unit provided by the first aspect of the present invention mixes water with a hot water inlet for flowing hot water discharged from a water heater, and hot water flowing into the hot water inlet to adjust the temperature. A plurality of hot water mixing means for performing, a plurality of hot water outlets for discharging the temperature-adjusted hot water toward a plurality of hot water supply destinations, and a target hot water supply temperature can be set corresponding to the plurality of hot water supply destinations A hot water mixing unit having a remote controller in communication connection and a control means for controlling the operation of the plurality of hot water mixing means, wherein the setting mode of the control means includes a first mode and a second mode. Any one of them can be set, and when the first mode is set, the control means determines a tapping temperature of the hot water heater based on target hot water temperature data transmitted from the remote controller, and While performing communication processing for hot water supply control so that the hot water supply is instructed to the hot water supply at the hot water temperature of the hot water, the plurality of hot water mixing means are controlled according to the target hot water supply temperature data from the remote controller, while the second When the mode is set, the plurality of hot water mixing means can be controlled in accordance with the target hot water temperature data from the remote controller without executing the communication process for controlling the hot water heater.

  The operation in which the control means is set to either the first mode or the second mode may be performed by, for example, a user performing a specific switch operation, or, as will be described later, the control means The determination may be made according to the above.

  In the present invention, when a hot water heater that can communicate with the control means is used, the control means is set to the first mode and cannot communicate (though it has no communication function at all). In addition, when the communication function is used but the communication protocol is different so that proper communication with the control means cannot be performed, the control means is set to the second mode. Set to. When the first mode is set, the control means determines the hot water temperature of the hot water heater based on the target hot water temperature data from the remote controller, and executes communication processing for instructing the hot water heater to discharge hot water at the hot water temperature. Therefore, hot water at a target hot water temperature can be efficiently and appropriately generated by supplying hot water at a temperature convenient for generating hot water at the target hot water temperature from the water heater to the hot water mixing unit. . On the other hand, when the second mode is set, the control means controls the hot water mixing means without executing the communication process as described above. It is possible to appropriately generate hot water having a target hot water supply temperature while avoiding the occurrence of confusion and avoiding confusion in the control. As described above, in the present invention, when a hot water supply capable of communication is used, hot water having a target hot water supply temperature can be efficiently generated while effectively utilizing the function, and communication is impossible. When is used, hot water at the target hot water temperature can be appropriately generated without causing confusion in the control. For this reason, the hot and cold water mixing unit of the present invention is excellent in usage flexibility that can be appropriately used in combination with various hot water heaters, for example, with existing hot water heaters owned by users. Combination use is also preferably achieved.

  In a preferred embodiment of the present invention, the control means determines whether or not a hot water heater capable of data communication with the control means is connected as a hot water heater within a predetermined time after activation. When it is determined that a water heater that has a determination function to determine data communication is connected, the first mode is set. On the other hand, when it is determined that the second mode is not, the second mode is It is configured to be set.

  According to such a configuration, it is determined by the control means itself whether or not the water heater is capable of performing proper communication with the control means, and the control means is determined according to the determination result. Is set to an appropriate one of the first mode and the second mode. Therefore, there is no trouble of performing the setting operation after determining whether the user should set the first mode or the second mode, and it is possible to eliminate an erroneous determination. Furthermore, even if the water heater was originally equipped with a function to perform proper communication with the control means, it was installed in a state where proper communication could not be performed due to, for example, inadequate communication wiring. In such a case, the control means is appropriately set to the second mode. As described above, according to the above-described configuration, it is possible to obtain an effect that the mode setting is made in accordance with the actual situation including the appropriateness of communication connection.

  In a preferred embodiment of the present invention, after the control means is set to the first mode, the control means continuously determines whether or not the communication status between the water heater and the control means is appropriate, and The first mode is maintained when it is determined to be appropriate, while it is switched to the second mode when it is determined that it is not appropriate.

  According to such a configuration, even when appropriate communication is initially performed between the water heater and the control means, when trouble occurs and communication between them cannot be performed properly, this communication is performed. This is detected and the control means switches from the first mode to the second mode. Therefore, it is possible to appropriately cope with the above situation.

  In a preferred embodiment of the present invention, when the second mode is set, the control means is configured such that the temperature of hot water flowing into the hot water inlet is lower than a target hot water temperature set by the remote controller. The remote controller is instructed to perform a notification operation so that this is notified by the remote controller.

  When the control means is set to the second mode, the hot water temperature is not instructed from the control means to the hot water heater, and the hot water temperature of the hot water heater is the remote controller prepared for the hot water heater itself or the hot water heater. If is not operated, it is maintained at a constant temperature. In such a situation, when the target hot water temperature is increased, the target hot water temperature may become higher than the hot water temperature of the water heater. This causes a problem that hot water at the target hot water supply temperature cannot be generated. On the other hand, according to the configuration, in such a situation, since a predetermined notification operation is performed in the remote controller, the user can detect the above and take measures so as not to cause the problem. It becomes.

  The hot water supply system provided by the second aspect of the present invention includes the hot water mixing unit provided by the first aspect of the present invention.

  According to such a configuration, the same effect as described for the hot and cold water mixing unit provided by the first aspect of the present invention can be obtained.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an example of a hot and cold water mixing unit according to the present invention. The hot / cold water mixing unit 2 of the present embodiment includes a hot water pipe 21A having a hot water inlet 21a, a water pipe 21B having a water inlet 21b, and hot water and water flowing through these pipes 21A and 21B at a predetermined ratio. A plurality of hot and cold water mixing valves 23 (23A to 23C) for mixing and generating hot water at a desired temperature, and a control unit 20 that controls driving of the hot water and water mixing valves 23 are provided. As will be described later, a hot water outlet of a water heater is connected by piping to the hot water inlet 21a, and a water supply pipe such as a water pipe is connected by piping to the water inlet 21b.

  A plurality of pipes 24A to 24C are connected to the downstream side of the plurality of hot water / mixing valves 23, and the ends of the pipes are used to discharge hot water toward a plurality of hot water supply destinations such as kitchens, bathrooms, and washrooms. The hot spring outlets 24a to 24c are provided. The pipe 24C is branched so as to have two outlets 24c, thereby increasing the number of hot water supply destinations. From these two outlets 24c, for example, the first floor and the second floor of the house, respectively. Hot water can be supplied to the washroom.

  Ends of the pipes 21A and 21B or their branch pipes are connected to the hot water / water inlet upstream of each hot water / mixture valve 23. Each hot / cold water mixing valve 23 can change the mixing ratio of hot water and water by operating the valve body 23a by driving the electric motor M, for example. Of the pipes 21A and 21B, on the upstream side of the hot and cold water mixing valves 23, a pair of on-off valves 22A and 22B, a hot water temperature and a pair of temperature sensors 70A and 70B for detecting the hot water temperature, and hot water and water mixing valves A plurality of check valves 74 that prevent backflow from the valve 23 are provided. In the pipes 24 </ b> A to 24 </ b> C on the downstream side of each hot water / water mixing valve 23, a temperature sensor 71 for detecting the temperature of hot water flowing out from each hot water / water mixing valve 23 and the maximum flow rate of hot water flowing out from each hot water / water mixing valve 23 are limited. An overflow prevention valve 72 and a flow rate sensor 73 are provided. Signals from the various sensors described above are transmitted to the control unit 20, and the various valves described above (except for the check valve) are driven and controlled by the control unit 20.

  The control unit 20 includes a CPU and various memories attached thereto, and also includes a communication circuit 20a. The communication circuit 20a is for executing data communication with a dedicated remote controller 3 or a specific hot water supply device to be described later. As will be described later, the control unit 20 determines whether or not the water heater used in combination with the hot / cold water mixing unit 2 is capable of appropriate data communication via the communication circuit 20a. Depending on the result, one of the first mode and the second mode is selected, and the control specific to each mode is executed.

  Next, a specific example of a hot water supply system configured using the hot water / water mixing unit 2 will be described with reference to FIGS. 2 and 3. An example of a specific operation processing procedure of the control unit 20 in these hot water supply systems will be described with reference to the flowchart of FIG.

  A water heater 1A of the hot water system A1 shown in FIG. 2 is capable of data communication with the control unit 20 of the hot water mixing unit 2. A plurality of remote controllers 3 are communicatively connected to the water heater 1 </ b> A and the hot / cold water mixing unit 2. Hot water supply pipes 60 </ b> A to 60 </ b> C having hot-water taps 6 </ b> A to 6 </ b> C at their ends are connected to the plurality of outlets 24 a to 24 c of the hot-water mixing unit 2, for example. These hot water supply pipes 60A to 60C are used for, for example, kitchen hot water supply, bathroom hot water supply, and washroom hot water supply.

  The hot water heater 1 </ b> A is an instantaneous hot water heater that employs, for example, a gas combustion method, and burns fuel gas by the combustor 12 while feeding combustion air from the blower blower 16 into the can 11. . A heat exchanger 14 having a water pipe 13 is provided above the combustor 12. A water supply pipe 40A such as a water pipe is connected to the water inlet 13a of the water pipe 13. Hot water obtained by heat exchange of the heat exchanger 14 is discharged from the hot water outlet 13b of the water pipe 13. This hot water outlet 13b is supplied to the hot water inlet 21a of the hot water mixing unit 2 through the pipe 41. A water supply pipe 40B such as a water pipe is connected to the water inlet 21b of the hot water / water mixing unit 2. The control unit 10 of the water heater 1A includes a communication circuit (not shown) capable of data communication with the hot / cold water mixing unit 2 and the remote controller 3 via the communication lines 51 and 50, and an instruction of the hot water temperature is given by the communication. When received, it is configured to execute control for changing the hot water temperature from the hot water outlet 13b. This control is performed by adjusting the amount of fuel gas supplied to the combustor 12, or by adjusting the opening degree of the flow rate adjusting valve 15 provided in the bypass passage 13c for mixing the hot water that has passed through the heat exchanger 14 with water. Done. In this water heater 1A, when any one of the plurality of hot water taps 6A to 6C is opened, a water flow is generated in the water pipe 13, and the flow rate exceeds a predetermined threshold value, the combustor 12 or the like. Is to be driven. Further, when the amount of flowing water decreases below the threshold value, the driving of the combustor 12 and the like is stopped, and such control is also handled by the control unit 10.

  As the plurality of remote controllers 3, there are, for example, a main remote controller 3A installed in a kitchen and sub-remote controllers 3B and 3C installed in a bathroom or a washroom. Each of these remote controllers 3 includes an operation switch 31 for inputting and setting data such as a target hot water supply temperature and a hot water supply flow rate (maximum hot water supply flow rate), and a display unit 32 for displaying data. Each remote controller 3 can perform data communication with the control unit 20 of the hot water mixing unit 2 via the communication lines 50 and 51. When data such as a target hot water supply temperature is input and set in each remote controller 3, The data is transmitted to the control unit 20 of the hot / cold water mixing unit 2. However, the sub remote controllers 3B and 3C can only set data on the bathroom or washroom in which they are installed, whereas in the main remote controller 3A, they are set by the sub remote controllers 3B and 3C. The data content can be taken in and stored, and data such as the target hot water temperature can be input and set for any hot water supply destination in the kitchen, bathroom, or washroom. Communication using the communication lines 50 and 51 is a superposed two-core system in which a DC voltage is applied to the communication lines 50 and 51 and an AM-modulated wave is superimposed and transmitted. Drive power is supplied from 1 to each remote controller 3. The hot water mixing unit 2 is supplied with driving power from a commercial power source, for example.

  In this hot water supply system A1, the control unit 20 of the hot water mixing unit 2 performs the following operation process. First, when each of the water heater 1A and the hot water mixing unit 2 is turned on and started, the control unit 20 can appropriately communicate data with the water heater 1A within a predetermined time from the start. A communication process for determining whether or not is (S1). As described above, since the water heater 1A is capable of appropriately performing data communication with the control unit 20, the communication is appropriate if there is no abnormality such as poor connection of the communication line 51 ( S2: YES). Then, the control unit 20 enters the first mode (S3). Even after the setting of the first mode, the control unit 20 continuously monitors whether or not communication with the water heater 1A is properly possible (S4). For example, the communication line 51 is disconnected thereafter. For example, when the communication is not appropriate, the mode is switched to the second mode (S5: NO, S13). The control operation in the second mode will be described later.

  When the control unit 20 is maintained in the first mode, the following control is performed. First, when data such as the target hot water temperature is set in the remote controller 3 and this data is transmitted, the control unit 20 captures and stores this data (S6: YES, S7). Next, when any of the hot water taps 6A to 6C is opened and the hot water is started (S8: YES), the hot water temperature of the hot water heater 1A is determined based on the data such as the target hot water temperature, and this hot water is discharged. An instruction that the hot water is discharged at the temperature is given to the water heater 1A (S9, S10). The hot water temperature is, for example, about 5 to 10 ° C. higher than the target hot water supply temperature. The hot water heater 1 </ b> A discharges hot water having a temperature in accordance with the instruction toward the hot water / water mixing unit 2. The control unit 20 controls the hot water mixing valve 23 corresponding to the hot water supply destination so that hot water having the target hot water temperature set by each remote controller 3 is generated (S11). Thereby, hot water of the target hot water supply temperature is appropriately supplied to the hot water supply destination.

  On the other hand, the water heater 1B of the hot water system A2 shown in FIG. 3 is incapable of data communication with the control unit 20. The plurality of remote controllers 3 are directly connected to the control unit 20 of the hot / cold water mixing unit 2 via the communication line 50. In this case, the control unit 20 applies a DC voltage to the communication line 50 and supplies power to each remote controller 3.

  The water heater 1B is, for example, an electric water heater having a hot water storage tank 80, and heats water supplied from the water supply pipe 40A through the water inlet pipe 81 into the hot water storage tank 80 by the heater 82 to store hot water. . When hot water is discharged from the hot water discharge pipe 83, for example, the temperature of the hot water can be adjusted by using the mixing valve 84 to which the branch pipe 81a of the water intake pipe 81 is connected and mixing the hot water to be discharged with water. . Hot water discharged from the hot water outlet 13b ′ is supplied to the hot water inlet 21a of the hot water mixing unit 2 via the pipe 41. A controller 85 that controls the mixing valve 84 and the heater 82 is connected to a remote controller 86 dedicated to the water heater 1B for inputting and setting various data such as the temperature of the hot water.

  In this hot water supply system A2, the control unit 20 of the hot water mixing unit 2 performs the following operation process. First, when each of the water heater 1B and the hot water mixing unit 2 is turned on and activated, the control unit 20 determines whether or not proper data communication with the water heater 1B is possible as in the previous case. However, in the case of this embodiment, since the water heater 1B does not have such a communication function, proper communication is not performed between them (S1, S2: NO). For this reason, the control unit 20 enters the second mode (S13).

  In the second mode, when data such as the target hot water temperature is transmitted from the remote controller 3, the control unit 20 captures the data (S14: YES, S15). This is the same as in the first mode. However, when any of the hot water taps 6A to 6C is opened and hot water supply is started, the hot water temperature of the hot water heater 1B is determined based on the target hot water temperature, unlike the first mode. The hot water mixing valve 23 is controlled so that the hot water supplied from the hot water heater 1B is set to the target hot water temperature without executing the communication control process instructing the machine 1B (S16: YES, S17). When communication with the hot water heater 1B is impossible, when the communication control process is executed intentionally, a response to the hot water heater 1B is expected even though the control unit 20 gives an instruction. In addition, since the instruction is different from the communication connection confirmation trial, there is a possibility that the control of the control unit 20 may be confused. On the other hand, according to the present embodiment, such confusion can be appropriately avoided.

  In the hot water supply system A2, since the hot water mixing unit 2 cannot instruct the hot water temperature to the hot water heater 1B, the hot water temperature of the hot water heater 1B is not changed using the remote controller 86. As long as it remains constant. Therefore, when the target hot water temperature set by the remote controller 3 is changed and the value is increased, this value may be higher than the hot water temperature of the hot water heater 1B. On the other hand, the control unit 20 grasps the hot water temperature Tb of the hot water heater 1B based on a signal from the temperature sensor 70A, and executes a process of comparing the hot water temperature Tb with the target hot water temperature Ta. (S18). In the flowchart of FIG. 4, such comparison processing is performed only during hot water supply, but is performed at other times (for example, every time the remote controller 3 is operated to change the target hot water supply temperature). It doesn't matter. As a result of the comparison, when it is determined that the target hot water temperature Ta is equal to or higher than the hot water temperature Tb of the water heater 1B, the control unit 20 instructs the remote controller 3 to perform a predetermined notification operation (S19: YES, S20). This notification operation can be in various modes such as sounding an alarm, generating sound, and displaying a predetermined image on the display unit 32. By this notification, the user can accurately detect the above and take countermeasures such as raising the hot water temperature of the hot water heater 1B or lowering the target hot water temperature.

  As described above, according to the hot and cold water mixing unit 2 of the present embodiment, it is a case where the hot water heater 1A capable of communicating with the control unit 20 and the hot water heater 1B capable of communicating are combined with each other. However, it is possible to appropriately supply hot water at the target hot water supply temperature to a desired hot water supply destination without causing confusion in the control operation. Of course, this hot water mixing unit 2 can construct an appropriate hot water supply system even when a hot water heater different from the hot water heaters 1A and 1B described above is used. It can also be used effectively. The hot water heater is not limited to the instantaneous type or the hot water storage type, and the heating method for generating hot water is not limited. A water heater of a type that generates hot water using a heat pump or solar heat can also be used.

  Further, in the present embodiment, as a means for determining whether or not the water heaters 1A and 1B combined with the hot / cold water mixing unit 2 can properly communicate with the control unit 20, the control unit 20 is made to actually try the communication. This makes the judgment accurate. Further, since the setting of the first mode or the second mode is performed by the control of the control unit 20 itself based on the above determination, it is not necessary for the user to perform the mode setting operation, which is more convenient. Furthermore, even if the water heater is originally capable of properly communicating with the control unit 20, for example, if the communication connection is defective due to a disconnection of the communication line, or after that, In such a case, since the second mode is set, there is also an advantage that accurate mode switching control suitable for the actual situation is executed.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the hot water supply system according to the present invention can be varied in design in various ways.

  As hot water mixing means of the hot water mixing unit, hot water mixing means having a structure different from that of the hot water mixing valve 23 described above can be used. A plurality of hot water / water mixing means may be provided, and the specific number thereof is not limited. The remote controller is only required to be able to set the target hot water supply temperature in correspondence with at least a plurality of hot water supply destinations, and the specific number is not limited. The communication method between the components of the hot water supply system is not limited to the superimposed two-core method, and may be another communication method such as a wireless communication method (including optical communication such as infrared communication).

  For example, the control means of the hot / cold water mixing unit may have a function of determining whether or not the operation of the plural hot water / water mixing means is normal. For example, when a predetermined operation command is given to the hot water mixing means so that hot water of the target hot water temperature is generated, the temperature of the hot water actually generated is detected and this temperature and the target hot water temperature are calculated. In comparison, if the error exceeds a certain range, the hot water / water mixing means can be performed normally. In the case where such a determination function is provided in the control means, if it is determined that the hot and cold mixing means is not normal, the user can instruct the remote controller to notify that fact by the remote controller. Appropriate response measures can be taken. In addition, when the setting mode of the control means is the first mode, in addition to the above-described instruction to the remote controller, if an instruction to prohibit the hot water supply is given to the hot water heater, hot water is It is also possible to eliminate the fear of being supplied first.

It is explanatory drawing which shows an example of the hot water mixing unit which concerns on this invention. It is explanatory drawing which shows an example of the hot water supply system comprised using the hot water mixing unit shown in FIG. It is explanatory drawing which shows the other example of the hot water supply system comprised using the hot water mixing unit shown in FIG. It is a flowchart which shows the example of the operation | movement procedure of the control part of the hot water mixing unit shown in FIGS.

Explanation of symbols

A1, A2 Hot water supply system 1A, 1B Water heater 2 Hot water mixing unit 3 (3A-3C) Remote control 6A-6C Hot water tap 20 Control unit (control means)
21a Hot water entrance 23 Hot water mixing valve (hot water mixing means)
24a-24c Hot spring outlet

Claims (5)

A hot water outlet for flowing hot water discharged from the water heater,
A plurality of hot water mixing means for adjusting the temperature by mixing water with the hot water flowing into the hot water inlet;
A plurality of hot water outlets for discharging the temperature-adjusted hot water toward a plurality of hot water supply destinations;
A remote controller capable of setting a target hot water supply temperature corresponding to the plurality of hot water supply destinations, and a control means for controlling the operation of the plurality of hot water mixing means;
A hot and cold water mixing unit comprising:
As the setting mode of the control means, either the first mode or the second mode can be selected and set,
When the first mode is set, the control means determines the hot water temperature of the hot water heater based on the target hot water temperature data transmitted from the remote controller, and instructs the hot water heater to discharge hot water at the hot water temperature. While controlling the plurality of hot water mixing means according to the data of the target hot water temperature from the remote controller, while performing the communication process for controlling the hot water heater as described above,
When the second mode is set, the plurality of hot water mixing means can be controlled in accordance with target hot water temperature data from the remote controller without executing the communication process for controlling the hot water heater. A hot and cold water mixing unit. The control means has a determination function for determining whether or not a hot water heater capable of data communication with the control means is connected as the hot water heater within a predetermined time after the activation,
When it is determined that a water heater capable of data communication is connected for communication, the first mode is set. On the other hand, when it is not determined, the second mode is set. The hot and cold water mixing unit according to claim 1.   After the control means is set to the first mode, the control means continuously determines whether or not the communication status between the water heater and the control means is appropriate, and when it is determined appropriate, the first means The hot and cold water mixing unit according to claim 2, wherein the hot water / water mixing unit is configured to switch to the second mode when it is determined that the mode is not appropriate while maintaining the mode.   When the temperature of the hot water flowing into the hot water inlet is lower than the target hot water temperature set by the remote controller when the second mode is set, the control means notifies the remote controller of this fact. The hot and cold water mixing unit according to claim 1, wherein the remote controller is instructed to perform a notification operation. A hot water supply system comprising the hot water mixing unit according to any one of claims 1 to 4.

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