JP6532746B2 - Hot water supply system - Google Patents

Description

  The present invention relates to a hot water supply system.

  As a hot water supply system 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 bath . In this type of hot water supply system, in the bath side circuit, a circulation path for circulating water in the bath outside, a circulation pump serving as a power source for flowing water in the circulation path, a bath heated by combustion heat of the bath side burner A side heat exchanger, a temperature sensor that detects the temperature of water flowing in the circulation path, and the like are provided.

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

  However, when using this type of system, there is a high possibility that foreign substances such as sebum of the bather, water stains, dust etc. mix in the water in the bath, and these foreign substances will accompany the water when performing the above-mentioned circulation heating operation. There is a problem that it circulates in the circulation circuit and adheres to the inner wall surface of the circulation circuit. In particular, when the circulation heating operation is repeated many times, foreign matter is gradually deposited 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 flowed into the circulation circuit at a predetermined timing, and cleaning is performed so as to wash away foreign substances adhering to the inside of the pipe.

JP 2011-89747 A

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

  That is, in this cleaning method, since the dirty water after having washed out the inside of the circulation circuit will be discharged into the bath, it can be said that it is desirable to carry out the pipe cleaning if there is no bather in the bath if possible. . However, adopting a complicated and expensive dedicated device just to confirm that there is no bather in the bath is not desirable in terms of cost effectiveness.

  The present invention has been made to solve the above-described problems, and it is easy to easily realize a configuration in which the possibility of performing pipe cleaning at a timing when no person is present in the bathtub is increased, and temporarily. An object of the present invention is to provide a configuration in which even if a person is near the bathtub when cleaning is performed, the person is less likely to feel anxious.

The present invention
A water pipe comprising a forward pipe and a return pipe and configured as a path into which water from the hot water supply side circuit enters and which constitutes at least a part of a circulation path for circulating water from a bath, and water passing through the water pipe A heat exchanger for conducting heat, wherein the forward piping leads water from the bathtub side to the heat exchanger side, and the return piping leads water from the heat exchanger side to the bathtub side The bath side circuit configured
A remote controller including a display unit and an operation unit used to start execution of the water filling function at least;
A filling controller configured to fill the inside of the bathtub on condition that a predetermined operation is performed on the operation unit;
After the pouring operation to the bath by the pouring control unit is completed, the water in the bath is circulated and circulated by the heat exchanger via the circulation path at least until a heat retention time elapses. A heat retention control unit that performs control to keep the water in the bathtub warm so as to heat the water;
Pipe washing control that conducts pipe washing control so as to guide water from the hot water supply side circuit into the circulation path and to cause the water to flow through the circulation path and into the bathtub after the heat retention control by the heat retention control unit is completed. Department,
A display control unit that causes the display unit to display a message indicating that piping cleaning is in progress when the piping cleaning control is performed by at least the piping cleaning control unit;
A heat retention time setting unit that sets the heat retention time;
Setting change means for changing the setting contents in the heat retention time setting unit based on an operation on the operation unit;
Have
When the heat retention time set by the heat retention time setting unit is shorter than a predetermined reference time, or when the heat retention time is not set by the heat retention time setting unit, the pipe cleaning control unit Do not perform piping cleaning control .

In the present invention, the heat retention control is performed by the heat retention control unit at least until the heat retention time elapses after the filling operation to the bath by the filling control unit is completed. Then, after the heat retention control by the heat retention control unit is completed, the pipe washing control unit conducts the pipe washing control so as to guide the water from the hot water supply side circuit into the circulation route and to cause the water to flow through the circulation route and into the bathtub. It is a structure.
Thus, in the configuration in which the heat retention control is performed, the user is highly likely to bathe while the heat retention control is performed, and the possibility of bathing after the heat retention control is reduced is reduced. Therefore, if the pipe cleaning is performed after the heat retention control is completed, the possibility of the pipe cleaning being performed at a timing when the user is not bathing becomes high. Moreover, since it is not necessary to provide a complicated and expensive dedicated device for monitoring the bathing of the user, it is also advantageous in terms of simplification of the device configuration.
Furthermore, in the present invention, at least when the pipe cleaning control is performed by the pipe cleaning control unit, a display indicating that the pipe is being cleaned is displayed on the display unit. Therefore, even if the user takes a bath after completion of the heat retention control, and the change due to the pipe cleaning (flow of cleaning water to the bath, etc.) occurs in the bathing period, the user during the bathing is displayed Since it is easy to recognize the cause of the change early by looking at the display of the department, it becomes difficult to have an anxiety due to the sudden change.
Further, the present invention is configured to have a heat retention time setting unit that sets the heat retention time, and a setting change unit that changes setting contents in the heat retention time setting unit based on an operation on the operation unit. If such setting change is made possible, the user can set a desired heat retention time, and the convenience is enhanced. In addition, by making it possible to change the setting of the heat retention time, the user can change the setting of “time until pipe cleaning is performed”, which further enhances convenience.
Further, according to the present invention, the pipe washing control unit is configured to set the heat retention time set by the heat retention time setting unit when the heat retention time is shorter than a predetermined reference time or the heat retention time set by the heat retention time setting unit. If not set, the pipe cleaning control is not performed. When the heat retention time is relatively short, the user is more likely to take a bath after completion of the heat retention control, as compared to when the heat retention time is relatively long. Therefore, if the piping cleaning control is not performed when the heat retention time is short, it is easy to prevent the piping cleaning from being performed during bathing. In addition, even when heat retention control is not performed (that is, when it is not possible to postpone piping cleaning until the heat retention time elapses), there is a possibility that piping cleaning may be performed during bathing if no measures are taken. If the cleaning control is not performed, such a situation can be easily avoided.

FIG. 1 is a schematic circuit diagram illustrating the hot water supply system according to the first embodiment. FIG. 2 is a block diagram schematically illustrating a controller and a remote controller that constitute the hot water supply system according to the first embodiment. FIG. 3 is a front view schematically showing a state in which 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 showing 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. 5 (A) is an explanatory view showing a display state on the display unit when temperature raising control (star water control) is performed in the hot water supply system according to the first embodiment, and FIG. 5 (B) is a diagram 5 (A) is an explanatory view showing a display state following FIG. 5 (A), and FIG. 5 (C) is an explanatory view showing a display state following FIG. 5 (B); FIG. 6A is an explanatory view showing a display state on the display unit when temperature decrease control (breakdown water control) is performed in the hot water supply system according to the first embodiment, and FIG. It is explanatory drawing which shows the display state following (A), and FIG.6 (C) is explanatory drawing which shows the display state following FIG.6 (B). FIG. 7 is a flowchart illustrating the flow of hot water filling / pipe cleaning control performed in the hot water supply system according to the first embodiment. FIG. 8A is an explanatory view showing a display state when the piping cleaning is performed when the remote controller is in the predetermined on state, and FIG. 8B is a diagram when the remote controller is in the predetermined off state It is an explanatory view showing a display state at the time of piping cleaning being performed. FIG. 9 (A) is an explanatory view showing a display state on the display unit when the pipe cleaning control is performed in the hot water supply system according to the first embodiment, and FIG. 9 (B) is a view shown in FIG. 9 (C) is an explanatory view showing a display state following FIG. 9 (B). FIG. 10 (A) is an explanatory view for explaining a setting operation for setting the pipe cleaning off, and FIG. 10 (B) is an explanatory view for explaining the setting operation for turning the pipe cleaning on. FIG. 11 is a flowchart illustrating the flow of hot water filling and piping cleaning control performed in the hot water supply system according to the second embodiment. FIG. 12 is a flowchart illustrating the flow of the pouring / pipe cleaning control performed in the hot water supply system according to the modification of the second embodiment. FIG. 13 is a flowchart illustrating the flow of hot water filling and piping cleaning control performed in the hot water supply system according to the third embodiment.

Te present invention odor mentioned above, the Atsushi Nobori control for raising the temperature of the water in the bathtub, and a cooling control for lowering the temperature of the water in the bath may be provided with at least perform temperature control unit. In this case, the display unit may be configured with a first display area for displaying a first figure and a second display area for displaying a second figure, and the temperature rise control is performed by the temperature control section. When performed, the first figure is displayed in the first display area and the second figure is not displayed in the second display area, and the temperature control unit performs the temperature decrease control. When the first figure is not displayed in the first display area and the second figure is displayed in the second display area, and the pipe cleaning control is performed by the pipe cleaning control unit, Display control may be performed such that the first graphic is in the display state in the first display area and the second graphic is in the display state in the second display area.
According to this configuration, while the temperature increase control state is represented by the first figure and the temperature decrease control state is represented by the second figure, the first figure and the second figure are used for the pipe cleaning state. Can be represented. In particular, a dedicated portion can be provided because a display used to clean the piping can be expressed by using a graphic used for other control display without preparing a large dedicated display portion. Since the resulting complication is less likely to occur and the display space can be efficiently used, the enlargement of the display area can be easily suppressed.

In any invention configured to be able to display the first graphic and the second graphic, the display device may have 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, and the second graphic displayed in the second display area is the bathtub display area The first display area and the second display area may include upper and lower two stages on the side of the bathtub display area.
In this configuration, the temperature rise control can be easily expressed using the first arrow pattern toward the bathtub. If the user can recognize that the first arrow figure is associated with the temperature increase control, the user intuitively grasps that the temperature increase control is being performed each time the first arrow figure is displayed. It will be easier. In addition, temperature control can be easily expressed using a second arrow figure directed to the bathtub. If the user can recognize that the second arrow figure is associated with the temperature decrease control, it becomes easy to intuitively understand that the temperature decrease control is being performed whenever the second arrow figure is displayed. . In particular, since it is possible to easily indicate which control is being performed by selectively displaying the upper and lower two-stage arrow graphics, it is possible to effectively display information without using much space.
Furthermore, with regard to the pipe cleaning control, it is possible to express a figure that is easy to intuitively imagine the pipe cleaning by a simple method of displaying the two types of arrow patterns described above together. In particular, only one of the two types of arrow graphics is displayed during temperature rise control or temperature drop control, so when double arrow graphic is displayed, another control other than temperature rise control or temperature drop control is performed. It becomes easy to grasp things quickly. In addition, at the time of piping cleaning, since more arrows are displayed than at the time of temperature increase control or temperature decrease control, it becomes easy to intuitively imagine that much water flows into the bath, “temperature increase control or temperature decrease It becomes easy to guess that another control that is not control is pipe cleaning.

Further, in any invention capable of displaying the first arrow graphic and the second arrow graphic, the display control unit is configured to execute the first arrow graphic while the pipe cleaning control is performed by the pipe cleaning control unit. Dynamic display is performed for a short time so that the double arrow figure gradually extends toward the bathtub figure as time passes while synchronizing the display degree of the second arrow figure and the display degree of the second arrow figure Display control may be performed so as to repeat each dynamic display.
In this configuration, the dynamic display such that the arrows in the upper and lower two stages are gradually extended is repeated during piping cleaning control, so that much water flows into the bathtub without relying on a special dedicated display unit. It can be expressed in a more easily imaginable manner. Then, when the user sees this dynamic display, it becomes easier to be more aware of the fact that the pipe cleaning is being performed, and even if it is a sudden pipe cleaning, confusion of the user is less likely to occur.

Further, in any invention capable of displaying the first figure and the second figure, the display control unit performs the pipe cleaning control by the pipe cleaning control unit when the remote controller is in a predetermined off state. While being performed, the display of the bathtub figure in the bathtub display area, the display of the first figure in the first display area, and the display of the second figure in the second display area The display control may be performed to turn off the display of predetermined operation information other than the bathtub figure, the first figure, and the second figure.
According to this configuration, even when the remote controller is in the predetermined OFF state, when piping cleaning control is performed, the user can be notified of that, and convenience can be easily enhanced while suppressing confusion of the user. . On the other hand, since the display of predetermined driving information can be turned off, power saving can be achieved by narrowing the display content.

Further, in any invention capable of displaying the first figure and the second figure, the remote controller may be configured as a first remote controller disposed in a bathroom. Furthermore, a second remote controller may be provided outside the bathroom. Then, the first display area and the second display area are configured in the display unit provided in the first remote controller, and the display control unit is configured such that the first remote controller is in the predetermined off state. When the pipe cleaning control is performed by the pipe cleaning control unit, the display of the bathtub graphic in the bathtub display area and the display of the first graphic in the first display area are performed by the first remote controller. The display control may be performed to perform the display and the display of the second figure in the second display area and to hide the display of the predetermined driving information. The second remote controller is interlocked to be in the power-off state when the first remote controller is in the predetermined off state, and is in the display device of the second remote controller when the power-off state is in effect. The entire display area 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 the necessary portion for notifying the pipe cleaning control. It becomes a state, and the display of predetermined driving information is turned off. Therefore, confusion of the user 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 the non-display state, so power saving can be further achieved. In this case, the second remote controller does not indicate that the pipe cleaning control is being performed, but outside the bathroom, the possibility of the user being confused due to the pipe cleaning is relatively low. Therefore, problems are less likely to occur even if power saving is emphasized.

Further, in any of the inventions capable of displaying the first figure and the second figure, the display control unit may perform the temperature increase control in the first display area when the temperature control unit performs the temperature increase control. A first graphic is displayed, and first information indicating that the temperature rise control is being performed at a position close to the first graphic is displayed, and the second graphic is displayed in the second display area. And the second information indicating that the temperature decrease control is being performed is not displayed, and when the temperature decrease control is performed by the temperature control unit, the second display area The second graphic is brought into a display state, and the second information is brought into a display state at a position close to the second graphic, and the first graphic is brought into a non-display state in the first display area, Point Is not displayed, and when the pipe cleaning control is 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. Display control may be performed such that the first information and the second information are both in the non-display state.
In this configuration, it is shown that the temperature increase control is performed at the time of the temperature increase control while achieving the efficiency of the display while sharing the display of the first figure with the temperature increase control and the pipe cleaning control. By displaying one piece of information in the vicinity of the first figure, it becomes easier to more surely recognize that the temperature rise control is in progress. In addition, while the display of the second figure is used both for the temperature reduction control and the pipe cleaning control to improve the display efficiency, the second information indicating that the temperature reduction control is being performed at the time of the temperature reduction control is By displaying in the vicinity of the figure, it becomes easier to more surely recognize that temperature reduction control is in progress. On the other hand, in the case of pipe cleaning control, both the first information and the second information are in the non-display state, which makes it difficult to be misrecognized as temperature increase control or temperature decrease control, and both the first figure and the second figure Since the special display state is also displayed, it is easy for the user etc. to recognize that it is a special control state.

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

  In the hot water supply side circuit 2, the water inlet pipe 12 is configured as a path into which the water from the water inlet 16 flows, and the outlet pipe 10 is configured as a path for delivering hot water to the hot water outlet 18. The heat exchanger 6 also 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, the water inlet pipe 12 is connected to the inlet of the secondary heat exchanger 8 in a configuration to supply tap water, and the water inlet pipe 12 is a water flow sensor 34 for detecting water flow in the pipe. (A hot water supply amount sensor) is provided. The heat transfer pipe 8a of the secondary heat exchanger 8 is connected to the downstream side of the water inlet pipe 12, and the heat transfer pipe 8a of the secondary heat exchanger 8 and the heat transfer pipe of the primary heat exchanger 7 are connected downstream thereof. A water pipe 20 connecting with 7a is connected. Further, the heat transfer pipe 7a of the primary heat exchanger 7 is connected in a configuration connected to the water flow pipe 20, and the hot water heated by the primary heat exchanger 7 is discharged at the outlet of the primary heat exchanger 7. The hot water discharge pipe 10 is connected. The tapping pipe 10 is provided with a thermistor 26 for detecting the temperature of water in the pipe.

  Further, in the hot water supply 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 gas is recovered by the unit 7, the secondary heat exchanger 8 functions to recover latent heat. The primary heat exchanger 7 is provided with a heat transfer pipe 7a serving as a water flow path in the primary heat exchanger 7. The heat of combustion contained in the combustion exhaust gas generated by the gas burner 4 is transmitted to the water passing through the heat transfer pipe 7a. Heat is transferred and heat is exchanged in the form of transfer of heat energy of sensible heat to water. Further, the secondary heat exchanger 8 is provided with a heat transfer pipe 8a serving as a water flow path in the secondary heat exchanger 8, and the combustion exhaust generated by the gas burner 4 is primary for water passing through the heat transfer pipe 8a. The heat of combustion after passing through the heat exchanger 7 is transferred, and heat energy of latent heat is exchanged so as to be transferred to the water.

  Moreover, as a water flow path which bypasses between the water supply pipe 12 and the hot water discharge pipe 10, the bypass path 14 comprised as a water flow path different from the heat exchanger 6 is provided. The bypass passage 14 is provided with a bypass valve 32 capable of shifting to a closed state in which the water flow in the bypass passage 14 is blocked and an open state in which the opening degree is increased more than the closed state. A water flow control valve 33 is provided upstream of the branch position where the bypass passage 14 is connected in the water inlet pipe 12. The water flow control valve 33 includes a motor whose rotation angle of the drive shaft is controlled in response to an instruction from the controller 22, and the water inlet pipe 12 is continuously opened at various degrees between the closed state and the fully open state. Can be changed in

  In the gas pipe 40 for supplying the gas to the gas burner 4, the gas source solenoid valve 42, the hot water supply gas proportional control valve 44, and the hot water supply switching solenoid valves 46, 46, ... for each branch pipe to each gas burner 4 from the upstream side Each is provided. Further, below the hot water supply combustion chamber 90, a fan 48 for supplying combustion air to the respective gas burners 4 (hot water supply burners) and the gas burners 54 (bath burners) is provided. Moreover, the switching solenoid valve 53 is provided in the branch pipe from the gas pipe connected to the gas burner 54 (bath burner).

  In the bath side circuit 3, the water flow pipe 66 is configured as a path into which the 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 bath 60 is circulated. The water pipe 66 includes a forward pipe 68 for guiding water from the bathtub 60 side to the heat exchanger 56, and a return pipe 67 for guiding water from the heat exchanger 56 to the bathtub 60. An intermediate pipe 69 connected to the forward pipe 68 and the return pipe 67 and passing through the heat exchanger 56 is provided. The water pipe 66 circulates so that, for example, water drawn from the bath 60 at the time of after-cooking operation is led through the pipe 68 to the heat exchanger 56 and water passed through the heat exchanger 56 is guided to the bath 60 by the return pipe 67. Function as a circulation route that can be Heat exchanger 56 includes a bath primary heat exchanger 57 and a bath secondary heat exchanger 58, and transmits the heat of combustion generated by the combustion in gas burner 54 (bath burner) to the water passing through water pipe 66. As such, it is configured to heat circulating water. The forward piping 68 is disposed between the bath 60 and the bath primary heat exchanger 57, and the forward piping 68 is provided with a thermistor 65 (bath thermistor) for detecting the temperature of water passing through the forward piping 68. ing.

  The return pipe 67 is disposed between the secondary bath heat exchanger 58 and the bath 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 flow pipe 66 to flow, and draws the water from the heat exchanger 56 side, and discharges the drawn water toward the bathtub 60 from the opposite side to the heat exchanger 56. Function. Further, a drop-in pipe 70 branched from the hot water outlet pipe 10 is connected to the return pipe 67, and a hot water supply solenoid valve 72 and a drop-in water amount sensor 74 are provided in the drop-in pipe 70. And by opening the hot water supply solenoid valve 72 provided in the drop-in pipe 70, it is possible to supply the hot water heated by the hot water supply side circuit 2 to the bathtub 60.

  Further, 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 and the like, a memory 22B configured as a known semiconductor memory and the like, and an interface for performing communication with the outside. And a communication unit 22C configured as The controller 22 is configured to be able to perform various controls such as the control shown in FIG. 7, for example.

  As shown in FIG. 2, a plurality of remote controllers 80 are connected to the controller 22 in a configuration capable of communicating with the controller 22. In the example of FIGS. 1 and 2, a plurality of remote controllers 80 includes a first remote controller 81 provided in a bathroom and a second remote controller 82 provided in a place different from the bathroom (for example, a kitchen). ing. As shown in FIG. 2, the first remote controller 81 is provided with a control unit 81A configured as a known microcomputer or the like, a display unit 81B configured as a liquid crystal display device or the like, and a plurality of known switches such as a press button. And a communication unit 81D for transmitting a signal or the like generated by the remote controller 81 to the controller 22. The appearance of the first remote controller 81 is, for example, as shown in FIG. As shown in FIG. 2, the second remote controller 82 is provided with a control unit 82A configured as a known microcomputer or the like, a display unit 82B configured as a liquid crystal display device or the like, and a plurality of known switches such as a press button. And a communication unit 82D for transmitting a signal or the like generated by the remote controller 82 to the controller 22. The appearance of the second remote controller 82 is, for example, as shown in FIG.

  The on and off states of the first remote controller 81 and the second remote controller 82 are interlocked with each other. 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, The first remote controller 81 and the second remote controller 82 both switch to the operation on state. Further, 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 both in the operation on state, the first remote controller 81 and the second remote controller 82 are both operated. Also switches to the operation off state. When one of the first remote controller 81 and the second remote controller 82 is in the operation on state, the controller 22 functions to operate the gas burner 4 and detects the water flow by the water flow sensor 34 (hot water detection sensor). The gas burner 4 is operated to generate hot water. On the other hand, when the first remote controller 81 and the second remote controller 82 are both in the operation-off state, the controller 22 does not operate the gas burner 4 and hot water is generated even when water flows in the water inlet pipe 12 or not. It is designed not to generate.

(Tashi hot water control, and pot water control)
In the hot-water supply system 1, it is possible to pour hot water into the bath 60 by hot-water filling control to be described later to perform hot-water filling. Further, in a state where hot water is put in the bath 60, it is possible to control hot water and control hot water, and it is possible to raise or lower the temperature of the hot water in the bath 60. In the present specification, the controller 22 corresponds to an example of the temperature control unit, and functions to at least perform temperature increase control to raise the water temperature in the bathtub 60 and temperature decrease control to decrease the water temperature in the bathtub 60. Do. Further, in the present specification, the control unit 81A of the first remote controller 81 corresponds to an example of the display control unit, and performs various display control to change the display of the display unit 81B.

  The hot water control is executed when a predetermined hot water start condition is established. Specifically, when the first remote controller 81 is in the above-described operation ON state and the controller 22 performs a predetermined hot water start operation (for example, an operation to press the hot water button 91F shown in FIG. 3), the controller 22 The hot water control is performed by. During the hot water control, the hot water supply circuit 2 is operated to generate hot water of a predetermined temperature (for example, a predetermined bath setting temperature), and from the hot water supply circuit 2 through the drop-in pipe 70 a predetermined temperature and a predetermined amount ( For example, pour 20 liters of hot water into the bath 60. The user may be configured to specify a "predetermined amount" which is the amount of hot water at the time of hot water control at the time of hot water start operation.

  Then, while the hot water control is being 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 configured in the display unit 81B will be described. In this configuration, a plurality of divided display areas are configured in the display unit 81B, and when all display areas configured in the display unit 81B are in the display state, the display as shown in FIG. 3 is performed. It has become so. An area in the display 81B shown in FIG. 3 that is bright (white) is an area that can be switched to the display state or the non-display state, and various information can be displayed by switching the display state of each of the subdivided display areas. Can be displayed.

  On the display unit 81B, a bathtub display area 114 for displaying a predetermined U-shaped bathtub figure 124, a first display area 111 for displaying a first figure 121, and a second figure 122 are displayed. A second display area 112, which 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 pointing to the bathtub display area 114 side. Further, 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. Then, the first display area 111 and the second display area 112 are configured in two upper and lower stages on the side of the bathtub display area 114. Further, as shown in FIG. 5C, temperature increase 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 is displayed to display first information (character information 141 of "Tatsuyu") indicating. Also, as shown in FIG. 6C, temperature control is being performed at a position close to the second graphic 122 (second arrow graphic) (ie, a position close to the second display area 112). A second information display area 132 is configured to display second information (character information 142 of "sashimizu") to be displayed. 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 graphic 124 represented in the bathtub display area 114.

  In the display unit 81B configured as described above, when hot water control is being performed by an instruction from the controller 22 (that is, when temperature increase control is performed by the temperature control unit), as shown in FIG. As described above, in the first display area 111, the first graphic 121 is brought into the display state, and at the same time, the temperature increase control is performed at a position close to the first graphic 121 The character information 141) is displayed. Furthermore, while making the 2nd figure 122 into a non-display state in the 2nd display area 112, the 2nd information (character information 142 of "break water") which shows that temperature-reduction control is performed is made into a non-display state. 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. It looks like a static display. On the other hand, the first display area 111 is displayed in the order of FIG. 5 (A), FIG. 5 (B) and FIG. 5 (C), and the display of FIG. 5 (A) (B) (C) is repeated several times. By repeating this, a dynamic display of a short time is repeatedly performed such that the arrow figure gradually extends toward the bathtub figure as time passes.

  Next, the flush water control will be described. The continuous water control is executed upon the establishment of a predetermined continuous water start condition. Specifically, when the first remote controller 81 is in the above-described operation-on state and the predetermined cutting water start operation (for example, the operation to press the cutting water button 91G shown in FIG. 3) is performed, the controller 22 controls the cutting water control. The operation is performed, and a predetermined amount (for example, 10 liters) of cold water is poured into the bath 60 without operating the gas burner 4. That is, at the time of final water control, the water introduced from the water inlet 16 without the gas burner 4 being burned is caused to flow into the bath 60 through the dropping pipe 70. The "predetermined amount", which is the fresh water volume at the time of the fresh water control, may be a configuration that can be specified by the user at the time of the hot water start operation.

  Then, when the burst water control is being performed by the instruction from the controller 22 (that is, when the temperature control is performed by the temperature control unit), the figure by the control unit 81A and the display unit 81B of the first remote controller 81. The display as shown in 6 is performed. Specifically, as shown in FIG. 6, the second information 122 indicates that the second graphic 122 is in the display state in the second display area 112 and that the temperature decrease control is being performed at a position close to the second graphic 122. (Character information 142 of "sashimizu") is displayed. Furthermore, with the first graphic 121 in the first display area 111 in the non-display state, the first information (character information 141 of “Tashi hot water”) indicating that the temperature rise control is being performed is in the non-display state. Do. 6 (A)-(C), the display of the bathtub figure 124, the character information 141, the water level information and the bath temperature are continuously displayed continuously. It is a static display. On the other hand, the second display area 112 is displayed in the order of FIG. 6 (A), FIG. 6 (B) and FIG. 6 (C), and the display of FIG. By repeating this, a dynamic display of a short time is repeatedly performed such that the arrow figure gradually extends toward the bathtub figure as time passes.

(Water filling and piping cleaning control)
Next, hot-water filling and piping cleaning control performed in the hot water supply system 1 of the present configuration will be described.
The control shown in FIG. 7 is executed, for example, when the remote controller 80 is in the above-described operation on state. 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 above-described operation OFF state, both the first remote controller 81 and the second remote controller 82 The operation is switched to the ON state, and the control of FIG. 7 is executed by the controller 22 using this switching as a trigger. In this control, first, the controller 22 performs the determination process of S10 to determine whether the pouring start condition is satisfied. The pouring 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 is pressed" or "the filling condition by reservation is satisfied". . In the process of FIG. 7, after the remote controller 80 is turned on, the determination of No is repeated in S10 until the pouring start condition is satisfied, and the standby state is entered. On the other hand, when the pouring start condition such as pressing of the automatic button 91D of the remote controller 81 is satisfied, the process proceeds to Yes in S10, and the pouring is started in S11. The controller 22 opens the hot water supply solenoid valve 72 provided in the drop-in pipe 70 with the execution of the process of S11, and operates the hot water supply side circuit 2 so as to generate hot water of a preset temperature. The hot water is controlled to flow into the bath 60 through the drop pipe 70 and the water pipe 66. After S11, it is determined whether 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 a preset amount of hot water, in S12. The determination of No is repeated, and pouring of hot water into the bathtub 60 will be continued. When the amount of hot water in the bathtub 60 reaches the preset amount of hot water, the process proceeds to Yes in S12, and the hot water supply solenoid valve 72 is closed to perform the above-described hot-water filling operation (that is, pouring hot water into the bathtub 60) ) (S13). Although not illustrated in FIG. 7, when the temperature in the bath 60 is equal to or lower than the set temperature when the amount of hot water set in advance is reached, the circulation pump 62 is driven to pass water in the bath 60. It is desirable to circulate by the water pipe 66 and to circulate heat so as to transfer the heat of combustion generated by the combustion in the gas burner 54 (bath burner) to the water passing through the water pipe 66 until the set temperature is reached. In the present configuration, the filling control is performed in this manner.

  In this configuration, the controller 22 corresponds to an example of the filling controller, and performs filling of the bathtub under the condition that the predetermined operation (for example, the pressing operation of the automatic button 91D or 92D) on the operation unit is performed. To function. The "predetermined operation on the operation unit" is one condition under which the filling operation can be started, and the start of the filling operation may be possible by any other method. For example, when a reservation is made to start pouring water when the set time arrives, the arrival of the set time is the filling start condition.

  After S13, it is determined whether the heat retention setting is made (S14). In this configuration, it can be set in advance whether or not heat retention control is to be performed, and specifically, the heat retention time can be input by performing a predetermined operation on the operation unit of the remote controller 80 It can be done. Then, when such heat retention time is input, the memory 22B stores information indicating that heat retention setting is made and the heat retention time. In the determination process of S14, the memory 22B is referred to, and when "information indicating that heat retention setting is made" and "heat retention time" are stored in the memory 22B, the process proceeds to Yes. On the other hand, when "the information indicating that the heat retention setting is made" is not stored in the memory 22B, the process proceeds to No in S14. When the process proceeds to No in S14, the process returns to S10, and as described above, the process waits until the pouring start condition is satisfied.

  On the other hand, if it is determined that "information indicating that heat retention setting is made" and "heat retention time" are stored in the memory 22B in S14, the process proceeds to Yes in S14, and the timer is started. Measurement of heat retention time is started (S15), and heat retention control is also started (S16). After heat retention control is started in S16, heat retention control is performed so as to repeat "circulating heating processing" and "waiting processing". "Circulating heat treatment" is a treatment performed by the execution of S16 or the end of the "standby treatment". In this treatment, the circulation pump 62 is driven to make the water flow and the water in the bath 60 flows through the water flow pipe 66. The water is circulated to flow back into the tub 60. Furthermore, the circulating water passing through the water flow pipe 66 is heated so as to transfer the heat of combustion generated by the combustion in the gas burner 54 (bath burner) to the water passing through the water flow pipe 66. This "circulation heating process" is performed until the temperature of the hot water in the bath 60 reaches the set temperature displayed in the temperature display area 118, and after the set temperature is reached, the "circulation heating process" is stopped and the "standby process" is performed. "I do. The “standby process” is performed when the temperature of the water in the bath 60 reaches a predetermined temperature during the circulation heating process, “the predetermined time has elapsed after the circulation heating process is stopped, and the temperature of the water in the bath 60 is The "waiting process" is performed so as to continue the stop of the "circulating heating process" until the condition that "is less than the set temperature" is satisfied. Then, when the above condition is satisfied, the "waiting process" is ended, and the "circulation overheat process" is performed again. After the heat retention control is started in S16, the heat retention control is performed so as to alternately repeat the "circulating heat treatment" and the "waiting treatment", and the measurement time from S15 is continued until the heat retention time set in advance is reached. Continue keeping warm control like that. And when the measurement time from S15 passes heat retention time, it progresses to Yes in S17 and complete | finishes heat retention control mentioned above (S18).

  In the present configuration, the controller 22 corresponds to an example of the heat retention control unit, and the bathtub 60 is operated through the circulation path at least until the heat retention time elapses after the pouring operation to the bathtub 60 by the pouring controller is completed. Control is performed to keep the water in the bath 60 warm so as to circulate the water therein and heat the water circulated by the heat exchanger 56. The above-described heat retention control is merely an example, and various methods other than the above-described methods can be used as long as the control method can keep the water in the bath 60 warm during the preset heat retention time.

  Further, in this configuration, the user can operate the operation unit of the remote controller 80 to input the heat retention time, and can designate an arbitrary heat retention time and store it in the memory 22B. Also, even if the heat retention time has already been set, the user can re-enter 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. It can be set. Specifically, the memory 22B and the control unit 22A correspond to an example of the heat retention time setting unit, and function to set the heat retention time (for example, the time interval from the start to the end of the heat retention control). Further, the memory 22B and the control unit 22A correspond to an example of setting change means, and function to change setting contents in the heat retention time setting unit based on an operation on the operation unit of the remote controller 80.

After the heat retention control is ended in S18, the pipe cleaning control is performed (S19).
When the pipe cleaning control is executed in S19, the controller 22 causes the water supply side circuit 2 to flow a predetermined amount (for example, 7 liters) of water (cold water or hot water) into the bath 60. Specifically, when the remote controller 80 is in the operation on state at the time of execution of S19 (that is, when the first remote controller 81 and the second remote controller 82 are both in the operation on state), the hot water supply side circuit 2 is operated. Hot water of 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 bath 60 from the hot water supply circuit 2 through the dropping pipe 70. 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 where the gas burner 4 is not ignited Then, the hot water supply solenoid valve 72 provided in the dropping pipe 70 is opened, and a predetermined amount (for example, 7 liters) of cold water (ie, cold water introduced from the water inlet 16) from the hot water supply side circuit 2 through the dropping pipe 70 Into the bathtub 60.

  In the present configuration, the controller 22 corresponds to an example of the pipe cleaning control unit, and a predetermined time elapses after completion of the pouring operation performed by the pouring control unit (specifically, by the heat retention control unit After the heat retention control is completed, the pipe cleaning control is performed so that the water is led from the hot water supply circuit 2 into the circulation path formed in the bath side circuit 3 and is allowed to pass through the circulation path and flow into the bathtub 60 To function.

  Further, in the case of the pipe cleaning control executed in S19, the display as shown in FIG. 8A or 8B is made on the display unit 81B of the first remote controller 81. In the present configuration, the control unit 81A of the first remote controller 81 corresponds to an example of the “display control unit”, and when the pipe cleaning control is performed, the pipe is being cleaned in the display unit 81B of the remote controller 81 Function to display an indication. 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 when the first remote controller 81 is in the operation off state. I do.

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

  In the example of FIG. 9, even when the first remote controller 81 is in either the operation on state or the operation off state, the tub display area is displayed in the display control by the control unit 81A while the pipe cleaning control is performed in S19. In the fixed display state where the bath tub graphic 124 is continuously displayed in 114, and in the fixed non-display state where neither the first information nor the second information is continuously displayed in the first information display area 131 and the second information display area 132. Do. On the other hand, in the first display area 111 and the second display area 112, while 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, Along with this, dynamic display is performed for a short time so that the double arrow graphic gradually extends toward the bathtub figure, and display control is performed so as to repeat the dynamic display for each 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 any of the first display area 111 and the second display area 112. At the display time shown in FIG. 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. The part (the first partial graphic 122A) is the same graphic, and the display of the same graphic is started at substantially the same timing. Then, at the display time (second time) of FIG. 9 (B) which comes immediately after the display time of FIG. 9 (A), either of the first display area 111 and the second display area 112 can be displayed as shown in FIG. The display of the first partial graphic from the display timing 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 figure 121 (second partial figure 121B) whose display starts at the display time of FIG. 9B and a part of the second figure 122 (first partial figure 122B) are the same figure. The display of the same figure is started at substantially the same timing. Furthermore, in the display period (third period) in FIG. 9C which comes immediately after the display period in FIG. 9B, the first and second partial figures from the display period in FIG. Is continuously displayed, and in addition to the display, the third part graphic corresponding to the tip portion of each arrow of the first graphic 121 and the second graphic 122 is displayed. A part of the first figure 121 (third partial figure 121C) whose display starts at the display time of FIG. 9C and a part of the second figure 122 (third partial figure 122C) are the same figure. The display of the same figure is started at substantially the same timing. Thus, the figure displayed in the first display area 111 and the figure displayed in the second display area 112 become the same figure at any of the first time, the second time, and the third time. In order to always display the same figure in the two areas, the display state of the double arrow figure is switched in synchronization.

  The display when the pipe cleaning control is performed in S19 is based on the display control as described above. Then, 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 displayed as shown in FIG. 9 while the display of the predetermined operation information is displayed as shown in FIG. Take control. In the example of FIG. 8A, the preset temperature information 120 for hot water supply, the energy saving information 126, the time information 127, the priority location information 128, and the like are displayed as the predetermined operation information.

  On the other hand, when the first remote controller 81 is in the operation OFF state (predetermined OFF state), the display control as shown in FIG. 9 is performed while the display of the predetermined operation information is not displayed as shown in FIG. I do. In the example shown in 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 for hot water supply, the energy saving information 126, the time information 127, and the priority location information Specifically, all figures and the like other than the first figure 121, the second figure 122, and the bathtub figure 124 are not displayed.

  In the present 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 in conjunction. 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.

<Modification 1 of Embodiment 1>
In the first embodiment, an example is shown in which the pipe cleaning control is not performed when the heat retention time is not set by the heat retention time setting unit, but the heat retention time set by the heat retention time setting unit is shorter than a predetermined reference time. In this case, the pipe cleaning control may not be performed. For example, when reference is made to the memory 22B in the determination process of S14, if the heat retention setting is not made (if the information indicating that the heat retention setting is made is not stored in the memory 22B), or the heat retention time is predetermined. At least one of the cases (if information indicating that heat retention setting is made is stored in the memory 22B but the heat retention time corresponding to it is shorter than the threshold time). Alternatively, the process may proceed to No in S14, and in this case, may return to S10.

<Modification 2 of Embodiment 1>
In either of the first embodiment or the modification thereof, the setting for performing the pipe cleaning control and the setting for not performing the pipe cleaning control may be switchable. For example, a predetermined setting operation (for example, the number "27" corresponding to the pipe cleaning is input to any operation unit of the remote controller 80, and the pipe cleaning is performed by inputting "On" corresponding to the number. If an operation to specify that the operation is to be performed is performed, it is displayed that the pipe cleaning control is to be performed as shown in FIG. 10B, and information indicating that the pipe cleaning is to be performed is stored in the memory 22B. it can. Also, a predetermined setting operation (the number “27” corresponding to the pipe cleaning is input to any operation unit of the remote controller 80, and the pipe cleaning is performed by inputting the “OFf” corresponding to the number. When the operation of designating no is performed, it is displayed that the pipe cleaning control is not performed as shown in FIG. 10A, and the information to that effect can be stored in the memory 22B. In such an example, the memory 22B is referred to immediately before the start of the process of S19, and when the information indicating that the pipe cleaning is to be performed is stored, the control of S19 is executed to indicate that the pipe cleaning is to be performed. If it is not stored, the control of S19 may not be executed. Such a control method can be applied to other embodiments described later.

Example 2
The hot water supply system 1 of the second embodiment is different from that of the first embodiment in that the hot-water filling / pipe cleaning control shown in FIG. 7 is changed as shown in FIG. 11, and the other points are the same as the first embodiment. Therefore, detailed description is abbreviate | omitted about the same point as Example 1, and suppose that FIGS. 1-6 and FIGS. 8-10 are referred suitably. 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 the first embodiment is provided for the hot water supply side circuit. . The hardware configuration of the remote controller 80 is also the same as that of the first embodiment, and has the same hardware configuration as the first remote controller 81 and the second remote controller 82 shown in FIG.

  As in the first embodiment, the pouring / pipe cleaning control shown in FIG. 11 is executed by the controller 22 when the remote controller 80 is in the above-described operation-on state. Also in this example, the controller 22 corresponds to an example of the filling controller. Further, in the filling and piping cleaning control shown in FIG. 11, the processing of S21 to S24 is the same processing as S10 to S13 of FIG. 7.

  On the other hand, in this example, immediately after the pouring control ends in S24, the timer is started in S25. Then, when the timer that has started measurement in S25 reaches a predetermined time, the process proceeds to Yes in S26, and pipe cleaning control is performed in S27. That is, in this example, the pipe cleaning control is performed when a predetermined time has elapsed after the completion of pouring of water. Note that the pipe cleaning control in S27 is the same control as the control in S19 of FIG. 7 and, in this example as well, the controller 22 corresponds to an example of the pipe cleaning control unit. Further, the display control method in the display unit 81B when the pipe cleaning control is performed in S27 is the same as the display control method (see FIGS. 8 and 9) of the display unit 81B in S19 of the first embodiment. Also in the example, at the time of piping cleaning control, the display unit 81B is made to display in the same manner as in the first embodiment to indicate that the piping is being cleaned.

<Example of Modification of Example 2>
The hot water supply system 1 of the modification is different from the representative example of the second embodiment described above in that the hot water filling and piping cleaning control shown in FIG. 11 is changed as shown in FIG. 12 and the other points are the same as the first embodiment. Similarly to the first embodiment, the water filling / pipe cleaning control shown in FIG. 12 is also executed by the controller 22 when the remote controller 80 is in the above-described operation ON state. Also in this example, the controller 22 corresponds to an example of the filling controller. Further, in the filling and piping cleaning control shown in FIG. 12, the processes of S31, S33, S34 and S35 are the same as S10, S11, S12 and S13 of FIG. 7, respectively.

  In this example, immediately after the pouring start condition is satisfied in S31, the timer is started in S32. Then, after the filling control is completed in S35, when the timer which has started the measurement in S32 reaches a predetermined time, the process proceeds to Yes in S36, and the pipe cleaning control is performed in S37. That is, in this example, the pipe cleaning control is performed when a predetermined time has elapsed since the start of the pouring control. Note that the pipe cleaning control in S37 is the same as the control in S19 of FIG. 7, and the controller 22 in this example also corresponds to an example of the pipe cleaning control unit. In addition, the display control method in the display unit 81B when the pipe cleaning control is performed in S37 is the same as the display control method (see FIGS. 8 and 9) of the display unit 81B in S19 of the first embodiment. Also in this example, at the time of pipe cleaning control, a display indicating that the pipe is being cleaned is displayed on the display unit 81B in the same manner as in the first embodiment.

Example 3
The hot water supply system 1 of the third embodiment is the same as the first embodiment except that the hot-water filling / pipe cleaning control shown in FIG. 7 is changed as shown in FIG. Therefore, detailed description is abbreviate | omitted about the same point as Example 1, and suppose that FIGS. 1-6 and FIGS. 8-10 are referred suitably.

  The pouring / pipe cleaning control shown in FIG. 13 is executed by the controller 22 when the remote controller 80 is in the above-described operation-on state, as in the first embodiment. Also in this example, the controller 22 corresponds to an example of the filling controller. Further, in the filling and piping cleaning control shown in FIG. 13, the processing of S41 to S44 is the same processing as S10 to S13 of FIG. 7.

  On the other hand, in this example, immediately after the pouring control is completed in S44, it is determined in S45 whether the remote controller 80 is in the operation OFF state. Then, if the remote controller 80 is not switched to the operation off state, the process proceeds to No in S45, and it is determined in S49 whether the pouring start condition is satisfied. The determination method of S49 is the same as the determination method of S41. That is, in this example, after the pouring control is completed in S44, the remote controller 80 is maintained in the operation ON state, and while the pouring start condition is not satisfied, the determination in No and S in S45 is repeated. It becomes a state. In addition, when the pouring start condition is satisfied in such a standby state, the process proceeds to Yes in S49, and the process of S42 and subsequent steps is performed.

  On the other hand, when the operation switching button of one of the remote controllers 80 is pressed in the standby state and the remote controller 80 is turned off, the process proceeds to Yes in S45 and starts the timer in S46. Then, when the timer that has started measurement in S46 reaches a predetermined time, the process proceeds to Yes in S47, and pipe cleaning control is performed in S48. That is, in this example, after the filling control is completed, the pipe cleaning control is performed when the remote controller 80 is turned off and the off state continues for a predetermined time. Note that the pipe cleaning control in S48 is the same as the control in S19 of FIG. 7, and the controller 22 in this example also corresponds to an example of the pipe cleaning control unit. Further, the display control method in the display unit 81B when the pipe cleaning control is performed in S48 is the same as the display control method (see FIG. 8, FIG. 9, etc.) of the display unit 81B in S19 of the first embodiment. Also in this example, at the time of pipe cleaning control, a display indicating that the pipe is being cleaned is displayed on the display unit 81B in the same manner as in the first embodiment.

  Also in this example, when the controller 22 corresponds to an example of the hot-water filling control unit and the remote controller 80 is in the predetermined off state (operation off state) and the predetermined time has elapsed, the hot water supply circuit 2 The pipe cleaning control is performed to guide the water into the circulation path and to flow the water through the circulation path and into the bath 60. Also in this example, the control unit 81A of the first remote controller 81 corresponds to an example of the display control unit, and at least when the pipe cleaning control is performed by the pipe cleaning control unit, the piping is being cleaned in the display unit 81B. Function to display an indication.

Other Embodiments
In the above-described embodiment, the operating state of the first remote controller 81 and the operating state of the second remote controller 82 are interlocked with each other. However, they may not be interlocked with each other. That is, the operation on state and the operation off state of the first remote controller 81 are switched independently of the second remote controller 82, and the operation on state and the operation off state of the second remote controller 82 are independent of the first remote controller 81. It may be configured to be switched.

  In the third embodiment, when the operation state of the first remote controller 81 and the operation state of the second remote controller 82 are switched independently, the first remote controller 81 is in the operation OFF state regardless of the second remote controller 82. If YES in step S45, the pipe cleaning control may be performed in step S48 if a predetermined time has elapsed since the first remote controller 81 was turned off.

  In the third embodiment, assuming that "a predetermined time has elapsed since the predetermined OFF state of the remote controller has been reached", "a predetermined time has elapsed since the remote controller 80 has reached the predetermined OFF state (the driving OFF state). Although “the case where it has been performed” is illustrated, “the case where the temperature in the bath 60 becomes equal to or lower than the predetermined temperature after the remote controller 80 is in the predetermined off state (operation off state)” may be used.

1 ... hot water supply system 2 ... hot water supply side circuit 3 ... bath side circuit 22 ... controller (water filling control unit, piping cleaning control unit, heat retention control unit, heat retention time setting unit, setting change unit)
56 ... heat exchanger 60 ... bathtub 66 ... water pipe (circulation route)
67 ... Return piping 68 ... Outgoing piping 81 ... 1st remote controller (remote controller)
81A ... control unit (display control unit)
81B: display unit 81C: operation unit 82: second remote controller (remote controller)
82C ... operation unit 111 ... first display area 112 ... second display area 121 ... first figure 122 ... second figure

Claims (2)

A water pipe comprising a forward pipe and a return pipe and configured as a path into which water from the hot water supply side circuit enters and which constitutes at least a part of a circulation path for circulating water from a bath, and water passing through the water pipe A heat exchanger for conducting heat, wherein the forward piping leads water from the bathtub side to the heat exchanger side, and the return piping leads water from the heat exchanger side to the bathtub side The bath side circuit configured
A remote controller including a display unit and an operation unit used to start execution of the water filling function at least;
A filling controller configured to fill the inside of the bathtub on condition that a predetermined operation is performed on the operation unit;
After the pouring operation to the bath by the pouring control unit is completed, the water in the bath is circulated and circulated by the heat exchanger via the circulation path at least until a heat retention time elapses. A heat retention control unit that performs control to keep the water in the bathtub warm so as to heat the water;
Pipe washing control that conducts pipe washing control so as to guide water from the hot water supply side circuit into the circulation path and to cause the water to flow through the circulation path and into the bathtub after the heat retention control by the heat retention control unit is completed. Department,
A display control unit that causes the display unit to display a message indicating that piping cleaning is in progress when the piping cleaning control is performed by at least the piping cleaning control unit;
A heat retention time setting unit that sets the heat retention time;
Setting change means for changing the setting contents in the heat retention time setting unit based on an operation on the operation unit;
Have
When the heat retention time set by the heat retention time setting unit is shorter than a predetermined reference time, or when the heat retention time is not set by the heat retention time setting unit, the pipe cleaning control unit Hot water supply system without piping cleaning control . The temperature control unit performs at least temperature increase control for raising the water temperature in the bathtub and temperature decrease control for decreasing the water temperature in the bathtub.
The display unit includes a first display area for displaying a first figure and a second display area for displaying a second figure,
When the temperature rise control is 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, and the temperature control is performed. When the temperature decrease control is performed by the unit, the first graphic is not displayed in the first display area, and the second graphic is displayed in the second display area, and the pipe cleaning control unit When the pipe cleaning control is performed, display control is performed so that the first graphic is displayed in the first display area and the second graphic is displayed in the second display area. Hot water supply system as described .