JP2016211751A - Hot water system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a constitution such that it is easy for a user to recognize that piping cleaning is being carried out in the form of an easy and more compact structure.SOLUTION: A hot water system 1 places a first figure 121 in a display state in a first display region 111 and a second figure 122 in a non-display state in a second display region 112 during temperature raising control, also places the first figure 121 in a non-display state in the first display region 111 and the second figure 122 in a display state in the second display region 112 during temperature lowering control. The hot water system further places the first figure 121 in the display state in the first display region 111 and the second figure 122 in the display state in the second display region 112 during piping cleaning control by a piping cleaning control part.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a hot water supply system.

  As a hot water supply system that has been conventionally provided, there is a bath system provided with a hot water supply side circuit used to heat water and a bath side circuit mainly used to circulate and heat water in a bathtub. . In this type of hot water supply system, in the bath side circuit, a circulation path that circulates the water in the bathtub outside, a circulation pump that serves as a power source for flowing the water in the circulation path, and a bath that is heated by the combustion heat of the bath side burner A side heat exchanger, a temperature sensor for detecting the water flow temperature in the circulation path, and the like are provided.

  In this hot water supply system, for example, when the water in the bathtub is kept warm, the circulation pump is driven to flow the water in the circulation path, and the water in the bathtub is circulated in the circulation path. On the other hand, the bath-side burner is burned to heat the bath-side heat exchanger, and heat is transferred to the water passing through the circulation path by the heated bath-side heat exchanger. Such a circulating heating operation is performed until the temperature detected by the temperature sensor reaches a predetermined temperature, and by repeating this circulating heating operation, the water in the bathtub can be maintained at a desired temperature.

  However, when this type of system is used, there is a high possibility that foreign substances such as sebum, scales, and dust of the bather are mixed in the water in the bathtub. There is a problem that it circulates in the circulation circuit and adheres to the inner wall surface of the circulation circuit. In particular, if the circulating heating operation is repeated many times, foreign matter gradually accumulates on the inner wall surface, which may cause various problems such as hygiene. Therefore, in the technique of Patent Document 1, a predetermined amount of water is allowed to flow through the circulation circuit at a predetermined timing, and cleaning is performed so as to wash away foreign substances adhering to the piping.

JP 2011-89747 A

  By the way, in the hot-water supply system described above, when cleaning the circulation circuit, the cleaning water supplied from the outside is sent to the circulation circuit, and flows so as to wash out the inside of the circulation circuit and is then discharged so as to be discharged into the bathtub. And the discharged water discharged | emitted by the bathtub is discharged | emitted out of a bathtub through the discharge port provided in the bathtub, for example.

  However, when such pipe cleaning is suddenly performed, an unexpected cleaning operation (for example, an operation in which a large amount of water suddenly flows into the bathtub) may confuse the user. For example, pipe cleaning may start when the user is bathing, and when the low-temperature discharged water that has a large temperature difference from the bath temperature flows into the bath as the pipe is washed, the bath is bathed in the bath. The user's body is directly exposed to low-temperature discharged water, which may cause confusion and discomfort for the user. Such confusion is not limited to bathing, and even when the user is outside the bathtub, the user may be confused by unexpected water inflow or discharge noise.

  As a method of solving such a problem, for example, when pipe cleaning is performed, a message indicating that pipe cleaning is in progress is displayed on the display unit of the remote controller, and the user visually indicates the cause of the sudden change. The method of making it grasp is mentioned. However, providing a dedicated display unit for notifying the pipe cleaning operation tends to increase the size and complexity of the apparatus configuration.

  The present invention has been made to solve the above-described problems, and realizes a configuration that allows a user to easily recognize that pipe cleaning is performed with a simpler structure and a smaller structure. It is intended.

The present invention includes a water pipe having a configuration in which water from a hot water supply side circuit enters, and a water pipe that includes a forward pipe that serves as a path for feeding water into the bathtub and a return pipe that serves as a path for water from the bathtub. A heat exchanger that transfers heat to the passing water, and a bath-side circuit that forms at least a part of a circulation path through which the water pipe circulates the water in the bathtub,
A remote controller comprising an operation unit and a display unit, wherein a first display area representing at least a first graphic and a second display area representing a second graphic are configured in the display unit;
A temperature control unit that performs at least temperature increase control for increasing the water temperature in the bathtub and temperature decrease control for decreasing the water temperature in the bathtub;
When a predetermined pipe cleaning condition is satisfied, a pipe cleaning control unit performs pipe cleaning control so as to guide water from the hot water supply side circuit into the circulation path and to flow through the circulation path and flow into the bathtub. When,
While the temperature increase control is being performed by the temperature control unit, the first graphic is displayed in the first display area and the second graphic is not displayed in the second display area. While the temperature control is being performed by the temperature control unit, the first graphic is in a non-display state in the first display area and the second graphic is in a display state in the second display area, While the pipe cleaning control is being performed by the pipe cleaning control unit, the first graphic is displayed in the first display area and the second graphic is displayed in the second display area. A display control unit for performing display control, and
Have

  According to the present invention, the basic operation of representing the temperature rise control state by the first graphic and the temperature drop control state by the second graphic is premised on the pipe washing state using the first graphic and the second graphic. Can be expressed. In particular, regarding the indication that pipe cleaning is being performed, it is possible to represent the graphic used for the display of other controls without providing a dedicated dedicated display unit, so a dedicated part should be provided. The resulting complication is unlikely to occur, and the display space can be used efficiently, so that an increase in the size of the display area can be easily suppressed.

FIG. 1 is a schematic circuit diagram illustrating a hot water supply system according to the first embodiment. FIG. 2 is a block diagram schematically illustrating a controller and a remote controller that configure the hot water supply system according to the first embodiment. FIG. 3 is a front view schematically illustrating a state where the cover is opened in the first remote controller of the hot water supply system according to the first embodiment. FIG. 4 is a front view schematically illustrating a state in which the cover is opened in the second remote controller of the hot water supply system according to the first embodiment. FIG. 5A is an explanatory diagram illustrating a display state on the display unit when temperature increase control (tanshi hot water control) is performed in the hot water supply system according to the first embodiment, and FIG. FIG. 5A is an explanatory diagram illustrating a display state following FIG. 5A, and FIG. 5C is an explanatory diagram illustrating a display state subsequent to FIG. 5B. FIG. 6A is an explanatory diagram illustrating a display state on the display unit when the temperature lowering control (seed water control) is performed in the hot water supply system according to the first embodiment, and FIG. 6B is a diagram illustrating FIG. FIG. 6C is an explanatory diagram showing a display state following (A), and FIG. 6C is an explanatory diagram showing a display state following FIG. 6B. FIG. 7 is a flowchart illustrating the flow of hot water filling / piping washing control performed in the hot water supply system according to the first embodiment. FIG. 8A is an explanatory diagram showing a display state when pipe cleaning is performed when the remote controller is in a predetermined ON state, and FIG. 8B is a diagram when the remote controller is in a predetermined OFF state. It is explanatory drawing which shows the display state at the time of piping washing | cleaning. FIG. 9A is an explanatory diagram illustrating a display state on the display unit when pipe cleaning control is performed in the hot water supply system according to the first embodiment, and FIG. 9B is a diagram illustrating FIG. FIG. 9C is an explanatory diagram illustrating a display state following FIG. 9B. FIG. 10A is an explanatory diagram for explaining a setting operation for setting pipe cleaning off, and FIG. 10B is an explanatory diagram for explaining a setting operation for setting pipe cleaning on.

The preferable form of this invention is illustrated below.
In the present invention, a bathtub display area for displaying a predetermined bathtub graphic may be configured on the display unit. The first graphic displayed in the first display area includes a first arrow graphic indicating the bathtub display area side, and the second graphic displayed in the second display area is the bathtub display area. A second arrow graphic pointing to the side may be included, and the first display area and the second display area may be configured in two upper and lower stages on the side of the bathtub display area.
In this configuration, the temperature rise control can be simply expressed using the first arrow graphic toward the bathtub. If the user can recognize that the first arrow graphic is associated with the temperature increase control, the user intuitively grasps that the temperature increase control is performed every time the first arrow graphic is displayed. It becomes easy. Moreover, about temperature fall control, it can represent simply using the 2nd arrow figure which goes to a bathtub. If the user can recognize that the second arrow graphic is associated with the temperature lowering control, the user can easily grasp that the temperature lowering control is being performed each time the second arrow graphic is displayed. . In particular, it is possible to easily notify which control is being performed by the alternative display of the two upper and lower arrow figures, so that it is possible to display effective information without taking up much space.
Furthermore, with regard to the pipe cleaning control, it is possible to represent a figure that makes it easy to intuitively imagine pipe cleaning by a simple method of displaying both of the two types of arrow figures described above. In particular, two types of arrow figures are displayed only on one side during temperature rise control or temperature drop control, and therefore, when the double arrow figure is displayed, another control that is not temperature rise control or temperature drop control is performed. This makes it easier to grasp things quickly. In addition, when cleaning pipes, more arrows are displayed than during temperature rise control and temperature fall control, making it easier to intuitively imagine that more water flows into the bathtub. It becomes easy to guess that “another control other than the control” is pipe cleaning.

In the present invention, the display control unit synchronizes the display degree of the first arrow graphic and the display degree of the second arrow graphic while the pipe cleaning control is performed by the pipe cleaning control unit. With a configuration that performs dynamic display for each short time so that the double-arrow graphic gradually extends toward the bathtub graphic as time passes, and performs display control to repeat the dynamic display for each short time There may be.
In this configuration, during pipe cleaning control, dynamic display is repeated so that the two upper and lower arrows gradually extend, so that a large amount of water flows into the bathtub without relying on a special dedicated display. It can be expressed in a mode that makes it easier to image. When the user sees the dynamic display, the user is more strongly aware that the pipe cleaning is being performed, and the user is less likely to be confused even if the pipe cleaning is sudden.

In the present invention, the display control unit may display the bathtub figure in the bathtub display area while the pipe cleaning control is performed by the pipe cleaning control unit when the remote controller is in a predetermined off state. Display of the first graphic in the first display area, and display of the second graphic in the second display area, and the bathtub graphic, the first graphic, and the first graphic The configuration may be such that display control is performed so that display of predetermined operation information other than two figures is turned off.
According to this configuration, even when the remote controller is in a predetermined off state, it is possible to notify the user while the pipe cleaning control is being performed, and it is possible to improve convenience while suppressing the user's confusion. It becomes easy to raise. On the other hand, since the display of the predetermined operation information can be turned off, it is possible to save power by narrowing the display content.

In the present invention, the remote controller may be configured as a first remote controller disposed in a bathroom. Furthermore, a second remote controller arranged outside the bathroom may be provided. And the said 1st display area and said 2nd display area are comprised in the said display part provided in the said 1st remote controller, The said 1st remote controller is the said predetermined | prescribed OFF state in the said display control part. Sometimes during the pipe cleaning control by the pipe cleaning control unit, the first remote controller displays the bathtub graphic in the bathtub display area and the first graphic in the first display area. The display may be configured to display and display the second graphic in the second display area, and to perform display control so that the display of the predetermined operation information is not displayed. The second remote controller is linked to a predetermined operation off state when the first remote controller is in the predetermined off state, and the second remote controller displays the second remote controller when the operation is in the off state. The entire display area of the apparatus may be in a non-display state.
According to this configuration, when the pipe cleaning control is performed when the two types of remote controllers are in the OFF state, the first remote controller disposed in the bathroom selectively displays a necessary portion for informing the pipe cleaning control. And the display of the predetermined operation information is turned off. For this reason, the user's confusion can be suppressed while saving power. On the other hand, in the second remote controller outside the bathroom, the entire display area of the display device is in a non-display state, so that further power saving can be achieved. In this case, the second remote controller does not indicate that pipe cleaning control is being performed, but it is relatively unlikely that the user will be confused due to pipe cleaning outside the bathroom. Therefore, even if power saving is more important, problems are less likely to occur.

In the present invention, the display control unit displays the first graphic in the first display area while the temperature control is being performed by the temperature control unit, and the first graphic The first information indicating that the temperature increase control is being performed at a position close to the display state is set to the display state, and the second graphic is not displayed in the second display area, and the temperature decrease control is performed. The second information indicating that it is in a non-display state, and while the temperature control is being performed by the temperature control unit, while the second graphic is displayed in the second display region, The second information is displayed at a position close to the second graphic, and the first graphic is not displayed in the first display area, and the first information is not displayed, and the pipe cleaning is performed. By the control unit During the pipe cleaning control, the first graphic is displayed in the first display area and the second graphic is displayed in the second display area, and the first information and The display control may be performed so that all the second information is in a non-display state.
In this configuration, the display of the first graphic is used for both the temperature increase control and the pipe cleaning control to improve the display efficiency, and the temperature increase control is performed during the temperature increase control. By displaying one piece of information in the vicinity of the first graphic, it becomes easier to recognize that temperature increase control is being performed more reliably. In addition, the display of the second graphic is used for both the temperature lowering control and the pipe cleaning control to improve the display efficiency, and at the time of the temperature lowering control, the second information indicating that the temperature lowering control is being performed is the second information. By displaying in the vicinity of the figure, it becomes easier to reliably recognize that the temperature lowering control is being performed. On the other hand, in pipe cleaning control, both the first information and the second information are in a non-display state, so that it is difficult to misrecognize as temperature increase control or temperature decrease control. Since the display is in a special display state, the user can easily recognize that the control state is special.

  In this invention, the said piping washing | cleaning control part may be the structure which performs the said piping washing | cleaning control, when the water quantity in the said bathtub becomes below a predetermined water quantity. According to this configuration, since the water in the bathtub is reduced and the pipe cleaning control can be performed in a state where there is a high possibility that there is no bather in the bathtub, the pipe cleaning is performed during bathing. (Problem that pipe cleaning causes confusion and discomfort for bathers).

  In the present invention, the pipe cleaning control unit may be configured to perform the pipe cleaning control when a predetermined predetermined time elapse condition is satisfied at least in a state where water is stretched in the bathtub. In this configuration, the pipe cleaning control can be performed after a certain amount of time has passed with the water filled in the bathtub and the possibility that there is no bather in the bathtub is relatively increased. It is possible to make it less likely to cause a problem (problem that pipe cleaning causes confusion and discomfort to the bather) due to the cleaning being performed.

<Example 1>
A first embodiment showing an example of the invention will be described below with reference to the drawings.
(Basic configuration)
A hot water supply system 1 shown in FIG. 1 is configured as a bath / hot water system having a hot water supply function to a bathtub and a heating function of water in the bathtub, and mainly includes a hot water supply side circuit 2 and a bath side circuit 3. . The hot water supply side circuit 2 includes a water inlet pipe 12, a hot water outlet pipe 10, a heat exchanger 6 (hot water supply side heat exchanger), and the like, and functions as a path for heating tap water supplied from outside and discharging hot water. The bath side circuit 3 includes a gas burner 54 (bath burner), a heat exchanger 56 (bath side heat exchanger), a water pipe 66, a circulation pump 62, the thermistors 64, 65, etc. Is used.

  In the hot water supply side circuit 2, the water inlet pipe 12 is configured as a path through which water flows from the water inlet 16, and the hot water outlet pipe 10 is configured as a path for feeding hot water to the hot water outlet 18. The heat exchanger 6 includes a primary heat exchanger 7 and a secondary heat exchanger 8 that exchange combustion heat from the gas burner (hot water supply burner) 4. In the hot water supply side circuit 2, a water inlet pipe 12 is connected to the inlet of the secondary heat exchanger 8 so as to supply tap water, and the water inlet sensor 12 for detecting water flow in the pipe is connected to the water inlet pipe 12. (Hot water supply amount sensor) is provided. A heat transfer tube 8 a of the secondary heat exchanger 8 is connected to the downstream side of the water intake pipe 12, and a heat transfer tube 8 a of the secondary heat exchanger 8 and a heat transfer tube of the primary heat exchanger 7 are connected to the downstream side thereof. The water flow pipe 20 which connects 7a is connected. Further, the heat transfer pipe 7a of the primary heat exchanger 7 is connected in a configuration connected to the water pipe 20, and the hot water heated by the primary heat exchanger 7 is discharged to the outlet of the primary heat exchanger 7. A tap pipe 10 is connected. The hot water discharge pipe 10 is provided with a thermistor 26 that detects the temperature of water in the pipe.

  Further, in the hot water combustion chamber 90, the primary heat exchanger 7 is disposed on the upstream side of the combustion exhaust path of the gas burner 4, and the secondary heat exchanger 8 is disposed on the downstream side of the combustion exhaust path. After the sensible heat of the combustion exhaust is recovered by the vessel 7, it functions to recover the latent heat by the secondary heat exchanger 8. The primary heat exchanger 7 includes a heat transfer tube 7a serving as a water passage in the primary heat exchanger 7, and the combustion heat contained in the combustion exhaust generated by the gas burner 4 with respect to the water passing through the heat transfer tube 7a. Heat is transferred and heat exchange is performed by transferring sensible heat energy to water. Further, the secondary heat exchanger 8 includes a heat transfer tube 8a serving as a water passage in the secondary heat exchanger 8, and the combustion exhaust generated in the gas burner 4 is primary with respect to the water passing through the heat transfer tube 8a. The combustion heat after passing through the heat exchanger 7 is transferred, and heat exchange is performed so that the heat energy of latent heat is transferred to the water.

  In addition, a bypass path 14 configured as a water flow path different from the heat exchanger 6 is provided as a water flow path that bypasses between the water inlet pipe 12 and the hot water discharge pipe 10. The bypass passage 14 is provided with a bypass valve 32 that can shift between a closed state in which water flow through the bypass passage 14 is blocked and an open state in which the opening degree is larger than the closed state. In the water inlet pipe 12, a water flow rate control valve 33 is provided upstream of the branch position where the bypass path 14 is connected. The water flow rate control valve 33 includes a motor that receives an instruction from the controller 22 and controls the rotation angle of the drive shaft, and continuously opens the water inlet pipe 12 at various degrees of opening between a closed state and a fully opened state. It can be changed automatically.

  The gas pipe 40 that supplies the gas to the gas burner 4 includes a gas source solenoid valve 42, a hot water supply gas proportional control valve 44, and hot water supply switching solenoid valves 46, 46,... For each branch pipe to each gas burner 4 from the upstream side. Each is provided. A fan 48 is provided below the hot water combustion chamber 90 to supply combustion air to each gas burner 4 (hot water burner) and gas burner 54 (bath burner). A switching solenoid valve 53 is provided in a branch pipe from the gas pipe connected to the gas burner 54 (bath burner).

  In the bath side circuit 3, the water conduit 66 is configured as a path through which water from the hot water supply side circuit 2 enters and constitutes at least a part of a circulation path through which the water from the bathtub 60 is circulated. The water pipe 66 includes an outgoing pipe 68 for guiding water from the bathtub 60 side to the heat exchanger 56 side, a return pipe 67 for guiding water from the heat exchanger 56 side to the bathtub 60 side, An intermediate pipe 69 that is connected to the forward pipe 68 and the return pipe 67 and passes through the heat exchanger 56 is provided. The water pipe 66 circulates so that, for example, water drawn from the bathtub 60 at the time of the additional cooking operation is guided to the heat exchanger 56 by the forward piping 68, and the water that has passed through the heat exchanger 56 is guided to the bathtub 60 by the return piping 67. Functions as a circulation path that can be The heat exchanger 56 includes a bath primary heat exchanger 57 and a bath secondary heat exchanger 58, and transfers combustion heat generated by combustion in the gas burner 54 (bath burner) to water passing through the water conduit 66. Thus, it becomes the structure which heats circulating water. The forward pipe 68 is disposed between the bathtub 60 and the bath primary heat exchanger 57, and the forward pipe 68 is provided with a thermistor 65 (a bath thermistor) that detects the temperature of water passing through the forward pipe 68. ing.

  The return pipe 67 is disposed between the bath secondary heat exchanger 58 and the bathtub 60, and the return pipe 67 is provided with a circulation pump 62 and a thermistor 64 (bath thermistor). The circulation pump 62 is a device that causes the water in the water conduit 66 to flow, draws water from the heat exchanger 56 side, and discharges the drawn water toward the bathtub 60 from the side opposite to the heat exchanger 56. Function. A drop pipe 70 branched from the hot water pipe 10 is connected to the return pipe 67, and a hot water solenoid valve 72 and a drop water amount sensor 74 are provided in the drop pipe 70. And the hot water heated by the hot water supply side circuit 2 can be supplied to the bathtub 60 by opening the hot water supply electromagnetic valve 72 provided in the dropping pipe 70.

  The hot water supply system 1 is provided with a controller 22 as a control device as shown in FIGS. 1 and 2. As shown in FIG. 2, the controller 22 includes, for example, a control unit 22A configured as a known microcomputer or the like, a memory 22B configured as a known semiconductor memory, and an interface for communicating with the outside. And a communication unit 22C configured as follows. The controller 22 is configured to perform various controls such as the control shown in FIG.

  As shown in FIG. 2, a plurality of remote controllers 80 are connected to the controller 22 in a configuration that can communicate with the controller 22. In the example of FIGS. 1 and 2, as the plurality of remote controllers 80, a first remote controller 81 provided in the bathroom and a second remote controller 82 provided in a place (for example, a kitchen) different from the bathroom are provided. ing. As shown in FIG. 2, the first remote controller 81 is provided with a control unit 81A configured as a known microcomputer, a display unit 81B configured as a liquid crystal display device, and a plurality of known switches such as push buttons. And at least an operation unit 81C used for starting execution of the hot water filling operation and a communication unit 81D for transmitting a signal or the like generated by the remote controller 81 to the controller 22. The external appearance of the first remote controller 81 is, for example, as shown in FIG. As shown in FIG. 2, the second remote controller 82 includes a control unit 82A configured as a known microcomputer or the like, a display unit 82B configured as a liquid crystal display device, and a plurality of known switches such as push buttons. And a communication unit 82D for transmitting a signal or the like generated by the remote controller 82 to the controller 22. The external appearance of the second remote controller 82 is, for example, as shown in FIG.

  The first remote controller 81 and the second remote controller 82 are configured to be linked in an on / off state. For example, when the operation switching button 91A of the first remote controller 81 or the operation switching button 92A of the second remote controller 82 is pressed when both the first remote controller 81 and the second remote controller 82 are in the operation-off state, Both the first remote controller 81 and the second remote controller 82 are switched to the operation-on state. Further, when the operation switching button 91A or the operation switching button 92A is pressed while both the first remote controller 81 and the second remote controller 82 are in the operation ON state, the first remote controller 81 and the second remote controller 82 are both Is also switched off. When either one of the first remote controller 81 and the second remote controller 82 is in an operation-on state, the controller 22 functions so that the gas burner 4 can be operated, and when water flow is detected by the water flow sensor 34 (hot water supply amount sensor). The gas burner 4 is operated to generate hot water. On the other hand, when both the first remote controller 81 and the second remote controller 82 are in the operation-off state, the controller 22 does not operate the gas burner 4, and the hot water can be discharged even when the water inlet pipe 12 is watered or not. Generation is not made.

(Tashiyu control and feed water control)
In the hot water supply system 1, hot water can be poured by pouring hot water into the bathtub 60 by hot water control described later. Moreover, in the state where hot water is stretched in the bathtub 60, hot water control and brazing water control are possible, and it is possible to raise or lower the temperature of the hot water in the bathtub 60. In the present specification, the controller 22 corresponds to an example of a temperature control unit, and functions to perform at least temperature increase control for increasing the water temperature in the bathtub 60 and temperature decrease control for decreasing the water temperature in the bathtub 60. To do. In the present specification, the control unit 81A of the first remote controller 81 corresponds to an example of a display control unit, and performs various display controls for changing the display of the display unit 81B.

  The hot water control is executed when a predetermined hot water start condition is established. Specifically, when a predetermined hot water start operation (for example, an operation of pressing the hot water button 91F shown in FIG. 3) is performed when the first remote controller 81 is in the operation-on state described above, the controller 22 is operated. The hot water control is executed. During the hot water control, the hot water supply side circuit 2 is operated to generate hot water having a predetermined temperature (for example, a predetermined bath setting temperature), and the hot water side circuit 2 is supplied with a predetermined temperature and a predetermined amount (through a dropping pipe 70). For example, 20 liters of hot water is poured into the bathtub 60. In addition, it may be configured such that the user can specify a “predetermined amount” that is the amount of hot water during the control of the hot water at the time of starting the hot water.

  And while the hot water control is performed by the controller 22, the display as shown in FIG. 5 is performed by the control unit 81A and the display unit 81B of the first remote controller 81. Here, each display area comprised in the display part 81B is demonstrated. In this configuration, a plurality of subdivided display areas are configured in the display unit 81B, and when all the display areas configured in the display unit 81B are in the display state, a display as shown in FIG. 3 is made. It has become so. 3 is a region that can be switched to a display state or a non-display state, and various information can be obtained by switching the display state of each subdivided display region. Can be displayed.

  On the display unit 81B, a bathtub display area 114 for displaying a predetermined bathtub figure 124 configured in a U shape, a first display area 111 for displaying the first figure 121, and a second figure 122 are displayed. A second display area 112 that is an area is configured. As shown in FIG. 5C, the first graphic 121 displayed in the first display area 111 is a first arrow graphic indicating the bathtub display area 114 side. Moreover, as shown in FIG. 6C, the second graphic 122 displayed in the second display area 112 is a second arrow graphic pointing to the bathtub display area 114 side. And the 1st display area 111 and the 2nd display area 112 are comprised by the upper and lower two steps | paragraphs in the side of the bathtub display area 114. FIG. Further, as shown in FIG. 5C, the temperature rise control is performed at a position close to the first graphic 121 (first arrow graphic) (that is, a position close to the first display area 111). A first information display area 131 for displaying first information (character information 141 of “Tashiyu”) is configured. In addition, as shown in FIG. 6C, the temperature lowering control is performed at a position close to the second graphic 122 (second arrow graphic) (that is, a position close to the second display area 112). A second information display area 132 for displaying the second information to be displayed (character information 142 of “sashimizu”) is configured. In addition, a temperature display area 118 representing the set bathtub temperature and a water level display area 116 representing the set water level information of the bathtub are formed inside the bathtub figure 124 represented in the bathtub display area 114.

  In the display unit 81B configured as described above, when the hot water control is performed according to an instruction from the controller 22 (that is, when the temperature control is performed by the temperature control unit), the display of FIG. As described above, in the first display area 111, the first graphic 121 is set to the display state, and the first information indicating that the temperature raising control is performed at a position close to the first graphic 121 ("Tashiyu" Character information 141) is displayed. Further, in the second display area 112, the second graphic 122 is set in a non-display state, and the second information (character information 142 of “sashimi”) indicating that the temperature lowering control is performed is set in a non-display state. In addition, during the hot water control, the display is switched as shown in FIGS. 5A to 5C, but the bathtub graphic 124, the character information 141, the water level information, and the bathtub temperature are continuously displayed. Static display like this. On the other hand, the first display area 111 is displayed in the order of FIGS. 5A, 5B, and 5C, and the displays of FIGS. 5A, 5B, and 5C are performed a plurality of times. By repeating, the dynamic display in a short time is repeatedly performed such that the arrow graphic gradually extends toward the bathtub graphic as time passes.

  Next, feed water control will be described. The feed water control is executed when a predetermined feed water start condition is established. Specifically, when the first remote controller 81 is in the operation-on state described above, a predetermined water supply start operation (for example, an operation of pressing the water supply button 91G shown in FIG. 3) is performed, and the controller 22 performs the water supply control. This is executed and a predetermined amount (for example, 10 liters) of cold water is poured into the bathtub 60 without operating the gas burner 4. That is, at the time of controlling water, the water introduced from the water inlet 16 without burning the gas burner 4 is poured into the bathtub 60 through the dropping pipe 70. The “predetermined amount”, which is the amount of feed water during the feed water control, may be configured so that the user can specify the feed water operation.

  When the water control is performed by an instruction from the controller 22 (that is, when the temperature control is performed by the temperature control unit), the control unit 81A and the display unit 81B of the first remote controller 81 can A display as shown in FIG. Specifically, as shown in FIG. 6, the second information 122 indicates that the second graphic 122 is displayed in the second display area 112 and the temperature lowering control is performed at a position close to the second graphic 122. (Character information 142 of “Sashimizu”) is set to the display state. Furthermore, in the first display area 111, the first graphic 121 is set to the non-display state, and the first information (character information 141 of “Tashiyu”) indicating that the temperature raising control is performed is set to the non-display state. To do. Note that during the feed water control, the display is switched as shown in FIGS. 6A to 6C, but the bathtub graphic 124, the character information 141, the water level information, and the bathtub temperature are continuously displayed. Static display. On the other hand, the second display area 112 is displayed in the order of FIGS. 6A, 6B, and 6C, and the displays of FIGS. 6A, 6B, and 6C are displayed a plurality of times. By repeating, the dynamic display in a short time is repeatedly performed such that the arrow graphic gradually extends toward the bathtub graphic as time passes.

(Water filling / pipe cleaning control)
Next, hot water filling / piping washing control performed in the hot water supply system 1 of this configuration will be described.
The control shown in FIG. 7 is executed, for example, when the remote controller 80 is in the operation-on state described above. For example, when the operation switching button 91A or the operation switching button 92A is pressed when the first remote controller 81 and the second remote controller 82 are in the operation-off state described above, both the first remote controller 81 and the second remote controller 82 are The operation is switched to the on-state, and the control in FIG. In this control, first, the controller 22 performs the determination process of S10, and determines whether or not the filling start condition is satisfied. The hot water start condition is, for example, either “the automatic button 91D of the remote controller 81 or the automatic button 92D of the remote controller 82 has been pressed” or “the hot water filling condition by reservation has been satisfied”. . In the process of FIG. 7, after the remote controller 80 is in the operation-on state, the determination of No is repeated in S10 until the hot water filling start condition is satisfied, and the standby state is set. On the other hand, when the hot water filling start condition such as the automatic button 91D of the remote controller 81 being pressed is satisfied, the process proceeds to Yes in S10, and the hot water filling is started in S11. With the execution of the process of S11, the controller 22 opens the hot water supply electromagnetic valve 72 provided in the drop pipe 70, operates the hot water supply side circuit 2 to generate hot water at a preset temperature, and generates It controls so that the hot water poured may be poured into the bathtub 60 through the dropping pipe 70 and the water flow pipe 66. After S11, it is determined whether or not the amount of hot water in the bathtub 60 has reached a preset amount of hot water (S12), and while the amount of hot water in the bathtub 60 has not reached the preset amount of hot water, in S12 The determination of No is repeated and the pouring of hot water into the bathtub 60 is continued. When the amount of hot water in the bathtub 60 reaches a preset amount of hot water, the process proceeds to Yes in S12, the hot water supply electromagnetic valve 72 is closed, and the hot water filling operation described above (that is, pouring hot water into the bathtub 60). ) Is terminated (S13). Although not shown in FIG. 7, when the temperature in the bathtub 60 is equal to or lower than the preset temperature when the preset amount of hot water is reached, the circulation pump 62 is driven to pass the water in the bathtub 60. It is desirable to circulate and heat the water pipe 66 so that combustion heat generated by combustion in the gas burner 54 (bath burner) is transferred to the water passing through the water pipe 66 until the set temperature is reached. In this configuration, hot water filling control is performed in this way.

  In this configuration, the controller 22 corresponds to an example of the hot water filling control unit, and performs hot water filling into the bathtub on condition that a predetermined operation (for example, pressing operation of the automatic button 91D or 92D) is performed on the operation unit. To function. The “predetermined operation with respect to the operation unit” is one condition capable of starting the hot water filling, and the hot water filling may be started by other methods. For example, when a reservation is made to start filling when the set time arrives, the arrival of the set time becomes the filling condition.

  After S13, it is determined whether or not a heat retention setting has been made (S14). In this configuration, whether or not to perform heat insulation control can be determined in advance by setting, and specifically, the heat insulation time can be input by performing a predetermined operation on the operation unit of the remote controller 80. It can be done. When such a heat retention time is input, information indicating that the heat retention setting is made and the heat retention time are stored in the memory 22B. In the determination process of S14, the memory 22B is referred to, and if “information indicating that the heat insulation setting is made” and “heat insulation time” are stored in the memory 22B, the process proceeds to Yes. On the other hand, if “information indicating that the heat insulation setting has been made” is not stored in the memory 22B, the process proceeds to No in S14. In addition, when progressing to No in S14, it returns to S10 and will be in a standby state until the hot water filling start condition is satisfied as described above.

  On the other hand, if it is determined in S14 that “information indicating that the heat insulation setting has been made” and “heat insulation time” are stored in the memory 22B, the process proceeds to Yes in S14 to start the timer. The measurement of the heat retention time is started (S15), and the heat retention control is also started (S16). After the heat insulation control is started in S16, the heat insulation control is performed so as to repeat the “circulation heating process” and the “standby process”. The “circulation heating process” is a process performed by executing S16 or ending the “standby process”. In this process, the circulation pump 62 is driven to flow water, and the water in the bathtub 60 passes through the water pipe 66. Water is circulated so as to pass back into the bathtub 60. Further, the circulating water passing through the water conduit 66 is heated so that the combustion heat generated by the combustion in the gas burner 54 (bath burner) is transmitted to the water passing through the water conduit 66. This “circulating heating process” is performed until the hot water temperature in the bathtub 60 reaches the set temperature displayed in the temperature display area 118, and after reaching the set temperature, the “circulating heating process” is stopped and the “standby process” is performed. "I do. The “standby process” is executed when the hot water temperature in the bathtub 60 reaches a predetermined temperature during the circulation heating process, and “a predetermined time has elapsed after the circulation heating process is stopped and the hot water temperature in the bathtub 60 is reached. The “standby process” is performed so that the “circulation heating process” is stopped until the condition “is less than the set temperature” is satisfied. If the above condition is satisfied, the “standby process” is terminated, and the “circular superheat treatment” is performed again. After the heat insulation control is started in S16, the heat insulation control is performed so that these “circulation heating process” and “standby process” are repeated alternately, and this measurement is continued until the measurement time from S15 reaches a preset heat insulation time. Continue to keep warm. And when the measurement time from S15 passes the heat retention time, it progresses to Yes in S17 and complete | finishes the heat retention control mentioned above (S18).

  Further, in this configuration, the user can input the heat retention time by operating the operation unit of the remote controller 80, and can specify any heat retention time and store it in the memory 22B. Further, even if the heat retention time has already been set, the user can re-input the heat retention time by a new operation on the operation unit, and the memory 22B is updated so as to newly store the re-input heat retention time. Can be set. Specifically, the memory 22B and the control unit 22A correspond to an example of a heat retention time setting unit, and function to set a heat retention time (for example, a time interval from the start to the end of the heat retention control). The memory 22B and the control unit 22A correspond to an example of a setting change unit, and function to change the setting content in the heat retention time setting unit based on an operation on the operation unit of the remote controller 80.

After finishing the heat retention control in S18, pipe cleaning control is performed (S19).
When the pipe cleaning control is executed in S <b> 19, the controller 22 causes a predetermined amount (for example, 7 liters) of water (cold water or hot water) to flow into the bathtub 60 from the hot water supply side circuit 2. Specifically, when the remote controller 80 is in an operation-on state at the time of execution of S19 (that is, when both the first remote controller 81 and the second remote controller 82 are in an operation-on state), the hot water supply side circuit 2 is operated. Then, hot water having a predetermined temperature (for example, a predetermined bath setting temperature) is generated, and a predetermined amount (for example, 7 liters) of hot water is poured into the bathtub 60 through the dropping pipe 70 from the hot water supply side circuit 2. On the other hand, when the remote controller 80 is in the operation-off state at the time of execution of S19 (that is, when both the first remote controller 81 and the second remote controller 82 are in the operation-off state), the non-operation state in which the gas burner 4 is not ignited is maintained. While opening the hot water solenoid valve 72 provided in the dropping pipe 70, a predetermined amount (for example, 7 liters) of cold water (ie, cold water introduced from the water inlet 16) through the dropping pipe 70 from the hot water supply side circuit 2 is provided. Is poured into the bathtub 60.

  In this configuration, the controller 22 corresponds to an example of a pipe cleaning control unit, and when a predetermined pipe cleaning condition is satisfied (specifically, a predetermined time has elapsed after completion of the hot water filling operation performed by the hot water control unit). In this case, for example, after the heat insulation control by the heat insulation control unit is completed), water is guided from the hot water supply side circuit 2 to the circulation path configured in the bath side circuit 3 and passed through the circulation path. The pipe cleaning control functions so as to flow into the bathtub 60.

  Further, in the pipe cleaning control executed in S19, the display as shown in FIG. 8A or FIG. 8B is made on the display unit 81B of the first remote controller 81. In this configuration, the control unit 81A of the first remote controller 81 corresponds to an example of the “display control unit”, and the pipe cleaning is being performed on the display unit 81B of the remote controller 81 when the pipe cleaning control is performed. It functions to make a display indicating. Specifically, the display as shown in FIG. 8A is performed when the first remote controller 81 is in the operation-on state, and the display as shown in FIG. 8B is performed when the first remote controller 81 is in the operation-off state. I do.

  In the example of FIG. 8, when the first remote controller 81 is in the operation on state (predetermined on state) or the operation off state (predetermined off state), the pipe cleaning control is executed in S19 (ie, When the pipe cleaning control is performed by the control unit 22A corresponding to the pipe cleaning control unit), the first display area 111, the second display area 112, the bathtub display area 114, the first information display area 131, the second information display The same display control is performed in the area 132. Specifically, the display as shown in FIGS. 9A, 9B, and 9C is switched at regular intervals regardless of whether the first remote controller 81 is in the operation-on state or the operation-off state. In this display, the first graphic 121 is in a dynamic display state in the first display area 111, the second graphic 222 is in a dynamic display state in the second display area 112, and the bathtub graphic 124 is displayed in the bathtub display area 114. Display control is performed so that the first information display area 131 and the second information display area 132 are both in a non-display state.

  In the example of FIG. 9, in the case where the pipe cleaning control is performed in S <b> 19 regardless of whether the first remote controller 81 is in the operation-on state or the operation-off state, In 114, a fixed display state in which the bathtub graphic 124 is continuously displayed, and in the first information display area 131 and the second information display area 132, neither the first information nor the second information is continuously displayed. To do. On the other hand, in the first display area 111 and the second display area 112, the display degree of the first graphic 121 (first arrow graphic) and the display degree of the second graphic 122 (second arrow graphic) are synchronized with time. Along with this, dynamic display is performed every short time so that the double-headed arrow shape gradually extends toward the bathtub shape, and display control is performed so as to repeat the dynamic display every short time.

  In the display time (first time) of FIG. 9A, only the first partial graphic corresponding to the root portion of each arrow graphic is displayed in both the first display area 111 and the second display area 112. 9A, a part of the first graphic 121 displayed in the first display area 111 (first partial graphic 121A) and one of the second graphic 122 displayed in the second display area 112 are displayed. The part (the first partial figure 122A) is the same figure, and the display of these same figures starts at substantially the same timing. Then, at the display time (second time) in FIG. 9B that comes immediately after the display time in FIG. 9A, both the first display area 111 and the second display area 112 have the display time shown in FIG. The display of the first partial graphic from the display time of) is continued, and in addition to the display, the second partial graphic corresponding to the middle part of each arrow of the first graphic 121 and the second graphic 122 is displayed. . A part of the first graphic 121 (second partial graphic 121B) and a part of the second graphic 122 (first partial graphic 122B) whose display starts at the display time in FIG. 9B are the same graphic. Are displayed at substantially the same timing. Further, in the display time (third time) in FIG. 9C that comes immediately after the display time in FIG. 9B, the first partial graphic and the second partial graphic from the display time in FIG. 9B. In addition to the display, a third partial graphic corresponding to the tip of each arrow of the first graphic 121 and the second graphic 122 is displayed. A part of the first graphic 121 (third partial graphic 121C) and a part of the second graphic 122 (third partial graphic 122C) whose display starts at the display time in FIG. 9C are the same graphic. Are displayed at substantially the same timing. Thus, the graphic displayed in the first display area 111 and the graphic displayed in the second display area 112 are the same graphic at any of the first time, the second time, and the third time. In addition, the display state of the double arrow graphic is switched synchronously so that the same graphic is always displayed in the two areas.

  The display when the pipe cleaning control is performed in S19 is based on the display control as described above. When the first remote controller 81 is in the above-described operation on state (predetermined on state), the display of the predetermined operation information is kept in the display state as shown in FIG. Take control. In the example of FIG. 8A, set temperature information 120 for hot water supply, energy saving information 126, time information 127, priority place information 128, and the like are displayed as predetermined operation information.

  On the other hand, when the first remote controller 81 is in the driving off state (predetermined off state), the display control as shown in FIG. 9 is performed while the display of the predetermined driving information is not displayed as shown in FIG. 8B. I do. In the example of FIG. 8B, while the pipe cleaning control is performed when the first remote controller 81 is in the operation-off state, the set temperature information 120 of the hot water supply, the energy saving information 126, the time information 127, the priority location information 128 and the like are not displayed, and specifically, graphics and information other than the first graphic 121, the second graphic 122, and the bathtub graphic 124 are not displayed.

  In this configuration, as described above, when the first remote controller 81 is in the operation-off state (predetermined off state), the second remote controller 82 is in the operation-off state. As described above, even when the pipe cleaning control is performed when the second remote controller 82 is in the operation-off state, the entire display area of the display unit 82B is maintained in the non-display state.

<Example 2>
The hot water supply system 1 of the second embodiment is the same as the first embodiment except that the hot water filling / piping washing control shown in FIG. Therefore, detailed description of the same points as in the first embodiment is omitted, and FIGS. 1 to 6 and FIGS. 8 to 10 are appropriately referred to. For example, a bath side circuit 3 having the same hardware configuration as that of the first embodiment is provided as the bath side circuit, and a hot water supply side circuit 2 having the same hardware configuration as that of the first embodiment is provided as the hot water supply side circuit. . The hardware configuration of the remote controller 80 is the same as that of the first embodiment, and has the same hardware configuration as that of the first remote controller 81 and the second remote controller 82 shown in FIG.

  In the hot water supply system 1 of the second embodiment, in the control of FIG. 7, the pipe cleaning control of S19 is not performed after the process of S18, and the process returns to the process of S10 after the process of S18. It should be noted that the hot water filling and heat insulation control can be performed in the same flow as in FIG. 7 except that S19 is omitted. Further, in this example, when the water level is lowered during the heat retention control of S16 to S18 (for example, when the water level is lowered from a preset set water level exceeding a certain value), hot water is replenished to the set water level in the bathtub 60. You may control so that it may.

  On the other hand, the controller 22 corresponding to the pipe cleaning control unit has a case where the water level in the bathtub 60 becomes equal to or lower than a predetermined value regardless of whether the remote controller 80 is in an operation-on state or an operation-off state (for example, the bathtub 60 The pipe cleaning control is performed when the water level inside becomes lower than the bus adapter that becomes the entrance and exit of the circulation path. The bath side circuit 3 is provided with, for example, a known bath water amount sensor (not shown) for detecting the water level in the bathtub 60, and when the output value of the bath water amount sensor becomes a predetermined value or less. Pipe cleaning control is executed by the controller 22. Also in this example, the controller 22 corresponds to an example of a pipe cleaning control unit, and functions to perform pipe cleaning control when the amount of water in the bathtub 60 becomes equal to or less than a predetermined amount of water.

  The pipe cleaning control executed in the second embodiment is the same as the control in S19 of FIG. 7, and the pipe cleaning is performed by the same method as in the first embodiment. In the second embodiment, the display control method in the display unit 81B when the pipe cleaning control is performed is the same as the display control method (see FIGS. 8 and 9) in the display unit 81B in S19 of the first embodiment. In this example as well, in the pipe cleaning control, the display 81B is made to display the pipe cleaning in the same manner as in the first embodiment.

<Other embodiments>
In any of the examples described above or described later, a setting for performing pipe cleaning control and a setting for not performing pipe cleaning control may be switched. Then, the pipe cleaning control may be performed only when the setting for performing the pipe cleaning control is made.

  In the hot water filling / pipe cleaning control of the first embodiment, the timing for performing the pipe cleaning control may be slightly changed, and the pipe cleaning control may be performed when a predetermined time has elapsed after the hot water filling control is completed. Or you may make it perform piping washing | cleaning control, when fixed time passes since hot water filling control started. Alternatively, after completion of the hot water filling, the pipe cleaning may be performed when a predetermined time has elapsed after the remote controller 80 is in a predetermined OFF state (operation OFF state).

DESCRIPTION OF SYMBOLS 1 ... Hot water supply system 2 ... Hot water supply side circuit 3 ... Bath side circuit 22 ... Controller (temperature control part, piping washing control part)
56 ... Heat exchanger 60 ... Bathtub 66 ... Water pipe (circulation path)
67 ... Return piping 68 ... Outward piping 81 ... First remote controller (remote controller)
81A: Control unit (display control unit)
81B ... Display unit 81C ... Operation unit 82 ... Second remote controller 82B ... Display unit (display device)
111 ... First display area 112 ... Second display area 114 ... Bathtub display area 121 ... First figure 122 ... Second figure 124 ... Bathtub figure 141 ... First information 142 ... Second information

Claims (8)

A water pipe comprising a forward pipe serving as a path for feeding water into the bathtub and a return pipe serving as a path for water from the bathtub, and configured to receive water from the hot water supply side circuit, and for water passing through the water pipe A heat exchanger for transferring heat, and a bath-side circuit constituting at least a part of a circulation path through which the water pipe circulates water in the bathtub;
A remote controller comprising an operation unit and a display unit, wherein a first display area representing at least a first graphic and a second display area representing a second graphic are configured in the display unit;
A temperature control unit that performs at least temperature increase control for increasing the water temperature in the bathtub and temperature decrease control for decreasing the water temperature in the bathtub;
When a predetermined pipe cleaning condition is satisfied, a pipe cleaning control unit performs pipe cleaning control so as to guide water from the hot water supply side circuit into the circulation path and to flow through the circulation path and flow into the bathtub. When,
While the temperature increase control is being performed by the temperature control unit, the first graphic is displayed in the first display area and the second graphic is not displayed in the second display area. While the temperature control is being performed by the temperature control unit, the first graphic is in a non-display state in the first display area and the second graphic is in a display state in the second display area, While the pipe cleaning control is being performed by the pipe cleaning control unit, the first graphic is displayed in the first display area and the second graphic is displayed in the second display area. A display control unit for performing display control, and
Having a hot water system. The display unit is configured with a bathtub display area for displaying a predetermined bathtub graphic,
The first graphic displayed in the first display area includes a first arrow graphic pointing to the bathtub display area side,
The second graphic displayed in the second display area includes a second arrow graphic pointing to the bathtub display area side,
The hot water supply system according to claim 1, wherein the first display area and the second display area are configured in two upper and lower stages on the side of the bathtub display area.   While the pipe cleaning control is being performed by the pipe cleaning control unit, the display control unit synchronizes the display degree of the first arrow graphic and the display degree of the second arrow graphic with time. The hot water supply system according to claim 2, wherein display control is performed so as to perform dynamic display for each short time so that the double arrow graphic gradually extends toward the bathtub graphic, and to repeat the dynamic display for each short time. .   While the pipe cleaning control is being performed by the pipe cleaning control unit when the remote controller is in a predetermined off state, the display control unit displays the bathtub graphic in the bathtub display area, The display of the first graphic in one display area and the display of the second graphic in the second display area, and a predetermined other than the bathtub graphic, the first graphic, and the second graphic The hot water supply system according to claim 2 or 3, wherein display control is performed so that display of operation information is turned off. The remote controller is configured as a first remote controller disposed in a bathroom,
Furthermore, a second remote controller arranged outside the bathroom is provided,
In the display unit provided in the first remote controller, the first display area and the second display area are configured,
While the pipe cleaning control is performed by the pipe cleaning control unit when the first remote controller is in the predetermined off state, the display control unit is configured to display the bathtub display area in the first remote controller. Displaying the bathtub graphic, displaying the first graphic in the first display area, and displaying the second graphic in the second display area, and not displaying the predetermined operation information Control the display so that
The second remote controller is linked to a predetermined operation off state when the first remote controller is in the predetermined off state, and in the display device of the second remote controller when the operation is in the off state. The hot water supply system according to claim 4, wherein the entire display area is in a non-display state. The display control unit
While the temperature increase control is being performed by the temperature control unit, the first graphic is displayed in the first display area, and the temperature increase control is performed at a position close to the first graphic. The first information indicating that it is being performed is displayed, the second graphic is not displayed in the second display area, and the second information indicating that the temperature lowering control is being performed is not displayed. Display state,
While the temperature control is being performed by the temperature control unit, the second graphic is displayed in the second display area, and the second information is displayed at a position close to the second graphic. A display state, and in the first display area, the first graphic is in a non-display state, and the first information is in a non-display state,
While the pipe cleaning control is being performed by the pipe cleaning control unit, the first graphic is displayed in the first display area and the second graphic is displayed in the second display area. The hot water supply system according to any one of claims 1 to 5, wherein display control is performed so that both the first information and the second information are in a non-display state.   The hot water supply system according to any one of claims 1 to 6, wherein the pipe cleaning control unit performs the pipe cleaning control when the amount of water in the bathtub becomes equal to or less than a predetermined amount of water.   7. The pipe cleaning control unit according to claim 1, wherein the pipe cleaning control unit performs the pipe cleaning control when at least a predetermined time lapse condition is satisfied in a state where water is filled in the bathtub. The hot water supply system according to item.