JP5287745B2 - Hot water supply system and controller - Google Patents

Description

The present invention relates to a hot water supply system and a controller including a display unit that can turn off the temperature display.

Conventionally, various technologies have been proposed to save energy by turning off the display when a predetermined time has passed without the operation of a button for setting the hot water temperature in a hot water terminal such as a currant or shower. (For example, refer to Patent Document 1). In the remote control device disclosed in Patent Document 1, the waiting time until the display on the display unit is turned off can be changed according to the user's preference.

JP 2006-349219 A

However, in the water heater provided with the remote control device disclosed in Patent Document 1, the display on the display unit is turned off after the standby time has elapsed, regardless of the temperature of the hot water supplied from the hot water supply terminal. In this case, if hot water is supplied without confirming the set temperature, hot water unexpected by the user may be discharged. Therefore, it is conceivable to notify the user of the set temperature by always turning on the display unit. In this case, the display unit is always lit to save power and extend the life of the display unit. I could not.

Therefore, the present invention has been made to solve the above-described problems, and when the set temperature is high, the time until the temperature is not displayed is set to be long so that the safety of the user is improved. It is an object of the present invention to provide a hot water supply system and a controller capable of reducing the power consumption and extending the life of a display unit while ensuring it.

In order to solve the above problem, a hot water supply system according to a first invention includes a hot water storage tank,
A temperature setting means for setting a temperature of hot water supplied from the hot water storage tank; a display section for displaying a temperature set by the temperature setting means; and a temperature in the display section when hot water is not supplied for a predetermined time. A display control means for turning off the display , and a waiting time that is a time until the temperature display on the display unit disappears when hot water supply is not performed after hot water supply is finished according to the temperature set by the temperature setting means. Standby time changing means for changing.

In this hot water supply system, when the set temperature set by the temperature setting means is high,
By setting a long standby time until the temperature is not displayed, it is possible to achieve power saving and long life of the display unit while ensuring the safety of the user.

A hot water supply system according to a second invention is the hot water supply system according to the first invention, wherein the waiting time changing means sets the waiting time to the first when the temperature set by the temperature setting means is lower than a predetermined temperature. And when the temperature set by the temperature setting means is equal to or higher than the predetermined temperature, the waiting time is set to a second time longer than the first waiting time.
Set to the waiting time.

In this hot water supply system, when the set temperature is high, the standby time until the temperature is no longer displayed becomes longer, so that the safety of the user is ensured and the power consumption and the life of the display unit are increased. Can do. In addition, when the set temperature is low, there is no concern that hot water unexpected by the user will be supplied, so the standby time until the temperature is no longer displayed is shortened to save power and extend the life of the display unit. Can be achieved.

A hot water supply system according to a third invention is the hot water supply system according to the second invention, further comprising a mixing valve for mixing hot water supplied from the hot water storage tank and water supplied from a water supply source, The valve keeps the opening at the opening at the time of the previous hot water supply until the predetermined time has passed since the hot water supply was stopped. Driven, and the waiting time changing means sets the second waiting time to the predetermined time or more.

In this hot water supply system, when the set temperature is high, since the temperature is displayed on the display unit until the mixing valve is closed, it is possible to ensure the safety of the user. And when the temperature display disappears, the mixing valve is already closed, the temperature of the hot water in the pipe is lowered, and the opening of the mixing valve is driven to the water side, so that hot water can be suddenly supplied. Absent. As a result, the safety of the user can be ensured.

A controller according to a fourth aspect of the invention is a controller for controlling the hot water discharged from the hot water storage tank, the temperature setting means for setting the temperature of the hot water supplied from the hot water storage tank, and the temperature set by the temperature setting means. The display unit to display, the display control means for turning off the temperature display on the display unit when no hot water is supplied for a predetermined time , and the hot water supply after the hot water supply is finished according to the temperature set by the temperature setting means Standby time changing means for changing a standby time which is a time until the temperature display on the display unit disappears when the display is not performed .

In this controller, when the set temperature set by the temperature setting means is high, the standby time until the temperature is no longer displayed is set longer, thereby ensuring the safety of the user and reducing the power consumption of the display unit. In addition, the life can be extended.

Controller according to a fifth aspect of the present invention includes a display unit displaying the preset temperature of the hot water to be hot water, when no hot water is performed for a predetermined time, the controller to turn off the temperature display on the display unit, after the hot water supply is finished When the hot water supply is not performed , a standby time that is a time until the temperature display on the display unit disappears is changed according to the set temperature.

In this controller, when the set temperature is high, by setting a long time until the temperature is not displayed, it is possible to save the power of the display unit and extend the life while ensuring the safety of the user. it can.

  As described above, according to the present invention, the following effects can be obtained.

In the first invention, when the set temperature set by the temperature setting means is high, by setting a long waiting time until the temperature is not displayed, while ensuring the safety of the user,
It is possible to save power and extend the life of the display portion.

In the second aspect of the invention, when the set temperature is high, the standby time until the temperature is no longer displayed becomes long, so that the safety of the user can be ensured while the power consumption and the life of the display unit are increased. You can plan. In addition, when the set temperature is low, there is no concern that hot water unexpected by the user will be supplied, so the standby time until the temperature is no longer displayed is shortened to save power and extend the life of the display unit. Can be achieved.

Moreover, in 3rd invention, when preset temperature is high temperature, since temperature is displayed on a display part until a mixing valve closes, ensuring of a user's safety | security can be ensured. And when the temperature display disappears, the mixing valve is already closed, the temperature of the hot water in the pipe is lowered, and the opening of the mixing valve is driven to the water side, so that hot water can be suddenly supplied. Therefore, the safety of the user can be ensured.

Further, in the fourth and fifth inventions, when the set temperature is high, the time until the temperature is not displayed is set to be long, thereby ensuring the safety of the user and reducing the power consumption of the display unit. Long life can be achieved.

1 is a piping system diagram of a water heater according to a first embodiment of the present invention. It is a front view of a remote control. It is a block diagram of the control part of a remote control. It is the figure which showed operation | movement of the display part when (a) hot-water supply temperature is high temperature, and (b) operation | movement of the display part when hot-water supply temperature is low temperature. It is the flowchart which showed the operation | movement until a remote control enters standby mode. 6 is a flowchart showing an operation until the remote control according to the second embodiment of the present invention enters a standby mode. It is the flowchart which showed the operation | movement until the remote control concerning 3rd Embodiment of this invention enters standby mode.

Hereinafter, an embodiment of a hot water supply system according to the present invention will be described based on the drawings.
In the present embodiment, a water heater 1 as an example of a hot water supply system will be described.

[Configuration of water heater]
As shown in FIG. 1, a hot water heater (hot water supply system) 1 includes hot water supplied to a curan A, a shower B, and a bath C (hereinafter, the curan A, the shower B, and the bath C are collectively referred to as “hot water supply terminal” as appropriate). As shown in FIG. 1, the apparatus includes a heat pump unit 1a, a hot water storage unit 1b, and a remote controller 1c. In the hot water heater 1 of the first embodiment, the hot water supply destination is exemplified by the curan A, the shower B, and the bath C. However, the hot water supply system of the present invention is not limited to the hot water supply terminals A, B, and C. You may provide the terminal which circulates warm water represented by the heating panel etc.

[Heat pump unit 1a]
The heat pump unit (heating means) 1 a heats water supplied from the lower part of the hot water storage tank 20 and supplies the heated hot water to the hot water storage tank 20. The heat pump unit 1a includes a compressor 10, a water heat exchanger 11, an electric expansion valve 12, an air heat exchanger 13, and a fan 1.
4. Then, the compressor 10, the water heat exchanger 11, the electric expansion valve 12, the air heat exchanger 13, valves, and the like are connected in a ring shape by a refrigerant pipe 15, whereby the refrigerant circuit 16.
Is configured. A gas heat exchanger 17 for exchanging heat between the high-temperature and high-pressure refrigerant coming out of the water heat exchanger 11 and the cold and low-pressure refrigerant coming out of the air heat exchanger 13 is arranged on the refrigerant circuit 16. .

[Hot water storage unit 1b]
The hot water storage unit 1b includes a hot water storage tank 20, a boiling circulation circuit 30, and a memorial circulation circuit 40.
A bath circulation circuit 50, hot water supply circuits 60 and 70, and a water supply circuit 80.

[Hot water storage tank 20]
The hot water storage tank 20 stores hot water boiled by the heat pump unit 1a. The hot water storage tank 20 is connected to the above-described boiling circulation circuit 30, additional circulation circuit 40, bath hot water supply circuit 60, currant / shower hot water supply circuit 70, and water supply circuit 80, and is heated by the heat pump unit 1 a. The hot water is a boiling circuit 30 and a memorial circuit 4
0, bath hot water supply circuit 60 and currant / shower hot water supply circuit 70 are configured to be supplied. The water supplied from the water supply source S is supplied to the lower part of the hot water storage tank 20 through the water supply circuit 80. The hot water storage tank 20 is provided with a plurality of remaining hot water amount thermistors 21 for detecting the remaining hot water amount in the hot water storage tank 20. The plurality of remaining hot water amount thermistors 21 are respectively provided at different height positions of the hot water storage tank 20.

[Boiling circuit 30]
The boiling circulation circuit 30 is a circuit provided to circulate hot water between the hot water storage tank 20 and the heat pump unit 1a. On the circuit, the boiling pump 31 and the above-described water heat exchanger 11 are provided. And the boiling three-way valve 32 is arrange | positioned. One end of the boiling circulation circuit 30 is connected to the bottom of the hot water storage tank 20 so that low temperature water at the lower part of the hot water storage tank 20 can be discharged. The other end of the boiling circulation circuit 30 branches from the three-way valve 32, one of which is connected to the top of the hot water storage tank 20 and the other is connected to the bottom of the hot water storage tank 20. Thereby, when the hot water heated by the heat pump unit 1a is low temperature, it becomes possible to return the low temperature water to the lower part of the hot water storage tank 20, and when the hot water heated by the heat pump unit 1a is high temperature. The hot water can be returned to the upper part of the hot water storage tank 20. In addition, the boiling circulation circuit 30 includes a water thermistor 18 that detects the temperature of water supplied to the heat pump unit 1a (hereinafter referred to as water temperature), and the temperature of water heated by the heat pump unit 1a (hereinafter referred to as water temperature). A hot water thermistor 19 for detecting the hot water temperature is provided.

[Memorial circuit 40]
The memorial circuit 40 is a circuit that is provided to heat the water in the bath C that circulates in the bath circuit 50 described later. On this circuit, a memorial heat exchanger 41 and a heat exchanger pump 4
2 are arranged. One end of the memory circulation circuit 40 is connected to the top of the hot water storage tank 20 so that hot water at the top of the hot water storage tank 20 can be discharged. The other end of the recirculation circuit 40 is connected to the bottom of the hot water storage tank 20, and the low-temperature water heat-exchanged by the regenerative heat exchanger 41 can be returned to the lower part of the hot water storage tank 20. ing.

[Bath circulation circuit 50]
The bath circulation circuit 50 is a circulation circuit that circulates the hot water of the bath C, and the water of the bath C is heated by exchanging heat with the hot water circulating through the memory circulation circuit 40 described above. On this circuit,
The bath circulation pump 51 and the above-mentioned regenerative heat exchanger 41 are arranged. The bath circulation circuit 50 is provided with a bath thermistor 52 that detects the temperature of the hot water in the bath C (bath temperature) and a water level sensor 53 that detects the water level of the bath C (hereinafter referred to as the bath water level). Yes.

[Bath hot water supply circuit 60]
The bath hot water supply circuit 60 is a circuit for supplying hot water stored in the hot water storage tank 20 to the bath C. On the circuit, a hot water mixing valve 61, a hot water solenoid valve 62, and a check valve are provided. 63, a hot water volume sensor 64, a check valve 65, and a hot water thermistor 66 are arranged. One end of the bath hot water supply circuit 60 is connected to the top of the hot water storage tank 20.
The hot water at the top of can be discharged. The other end of the bath hot water supply circuit 60 is connected to the bath C.
It is connected to the. The hot water mixing valve 61 adjusts the temperature of the hot water supplied to the bath C by mixing the hot water supplied from the hot water storage tank 20 and the water supplied from the water supply source S. The hot water sensor 64 is provided to detect the flow rate of hot water supplied to the bath C, and the hot water thermistor 66 is provided to detect the temperature of hot water supplied to the bath C. Yes.

In the present embodiment, the opening degree of the hot water mixing valve 61 is adjusted according to the temperature of the hot water supplied to the bath C. The hot water mixing valve 61 is configured to keep the opening degree at the time of supplying the hot water immediately before a predetermined time has passed since the hot water supply was stopped. The time from when the hot water supply is stopped until the opening degree of the hot water mixing valve 61 is closed is defined as a first opening degree holding time (for example, 30 minutes). As a result, when the hot water supply is resumed immediately after the hot water supply is stopped, it is possible to supply hot water having the same temperature as the immediately preceding hot water. The hot water mixing valve 61 drives the opening to the water side after the first opening holding time has elapsed.

[Karan / shower hot water supply circuit 70]
The currant / shower hot water supply circuit 70 is a circuit for supplying hot water stored in the hot water storage tank 20 to the currant A and the shower B. On the circuit, a hot water mixing valve 71, a hot water supply amount sensor 72, A hot water supply thermistor 73 is arranged. This currant shower hot water supply circuit 7
One end of 0 is connected to the top of the hot water storage tank 20 so that hot water at the top of the hot water storage tank 20 can be discharged. The other end of the curan / shower hot water supply circuit 70 is connected to the curan A
And a shower B. The hot water supply mixing valve 71 adjusts the temperature of the hot water supplied to the currant A and the shower B by mixing the hot water supplied from the hot water storage tank 20 and the water supplied from the water supply source S. The hot water supply amount sensor 72 is provided to detect the flow rate of hot water supplied to the currant A and the shower B, and the hot water supply thermistor 73 is connected to the currant A.
And is provided for detecting the temperature of hot water supplied to the shower B.

Moreover, the hot water supply mixing valve 71 is adjusted in opening degree according to the temperature of hot water supplied to the currant A and the shower B, similarly to the hot water mixing valve 61 described above. The hot-water supply mixing valve 71 is configured to maintain the opening degree at the time of supplying hot water immediately before a predetermined time elapses after the hot water supply is stopped. The time from when the hot water supply is stopped until the opening of the hot water supply mixing valve 71 is closed is defined as a second opening holding time (for example, 30 minutes). This
When the hot water supply is resumed immediately after the hot water supply is stopped, it becomes possible to supply hot water having the same temperature as that of the immediately preceding hot water. The hot water mixing valve 71 drives the opening degree to the water side after the second opening degree holding time has elapsed.

[Water supply circuit 80]
The water supply circuit 80 converts the tap water supplied from the water supply source S into the hot water storage tank 20 and the hot water mixing valve 61.
And a hot water mixing valve 71. A strainer 81, a check valve 82, a water temperature thermistor 83, and a check valve 84 are disposed on the circuit from the water supply source S to the hot water storage tank 20 of the water supply circuit 80. The water temperature thermistor 83 is provided for detecting the temperature of tap water supplied from the water supply source S to the hot water storage tank 20.

[Control unit 90]
The water heater 1 is provided with a control unit 90 configured by a microcomputer, a memory, and the like. The control unit 90 includes the above-described incoming thermistor 18, outgoing hot water thermistor 19, a plurality of remaining hot water amount thermistors 21, a hot water supply amount sensor 72, a hot water supply thermistor 73, a heat exchange circulation pump 42, a bath thermistor 52, a bath circulation pump 51, and a water level sensor 53. The hot water sensor 64, the hot water thermistor 66, the remote controller 1c, and the like are communicably connected by wire or wireless. For example,
The operation command of the water heater 1 input to the remote controller 1c by the user or the like is sent to the control unit 90, and the control unit 90 outputs a control signal to each component based on the operation command, thereby supplying the water heater. 1 operation is controlled.

[Remote control 1c]
The remote controller 1c includes a kitchen remote controller installed in the kitchen where the currant A is provided and a bathroom remote controller provided in the bathroom where the bath C is installed. The kitchen remote controller and the bathroom remote controller are controllers for controlling the hot water from the hot water storage tank 20 in accordance with the user's operation, and the kitchen remote controller is provided for controlling the hot water supply related to the Karan A and the shower B. ,
The bathroom remote control is provided to control hot water supply related to the bath C.

As shown in FIG. 2, the remote controller 1c includes a display unit 100 that displays a set temperature of hot water supplied to the currant A and the shower B and a remaining hot water amount in the hot water storage tank 20, an operation unit 101 that includes various buttons, a voice The control part 11 which performs various control of the speaker 102 which outputs, and the remote control 1c
0. The display unit 100 is a liquid crystal monitor, which includes the date and time (“10/10 (Tue) 10:19” in the figure), the set temperature of Karan A and shower B (“42 ° C.” in the figure), and the set temperature of bath C. (“42 ° C.” in the figure), the amount of remaining hot water (“100 L” in the figure and an image of the tank showing the amount of remaining hot water), etc. Further, the operation unit 101 is provided with a temperature setting button 101a for setting the set temperature of the currant A and the shower B and the set temperature of the bath C, a menu button 101b for changing various settings, and the like. . The remote control 1c includes
A lid 103 (see FIG. 3) that covers each button of the operation unit 101 is provided. In addition, the speaker 102 outputs the above-described button push sound, a notification sound that the set temperature has been changed, and the like.

In the present embodiment, as shown in FIG. 3, the control unit 110 of the remote controller 1c mainly includes a display control unit 111, a temperature setting unit 112, a standby time changing unit 113, a storage unit 114, a timer 115, A lid opening / closing detection unit 116.

The display control unit 111 controls display on the display unit 100. Specifically, the display control unit 111
When the set temperature is changed by the temperature setting unit 112, the set temperature displayed on the display unit 100 (in FIG. 2, the hot water supply / shower is “42 ° C.” and the bath is “42 ° C.”) is changed. When the remaining hot water amount in the hot water storage tank 20 changes, the remaining hot water amount displayed on the display unit 100 (in FIG. 2,
“100L” and the scale of the tank image diagram) are changed, and the date and time (“10/10 (Tue) 10:19” in FIG. 2) displayed on the display unit 100 is displayed on the display unit 100. . In the present embodiment, as shown in FIG. 4, the display control unit 111 turns off the temperature display on the display unit 100 when the device is not used for a predetermined time or more. here,
The display control unit 111 switches the screen on the display unit 100 that displays the temperature to a screen that does not display the temperature. The screen in which the temperature is not displayed is a state in which the backlight of the display unit 100 is turned off and nothing is displayed on the screen, an animation having no correlation with the screen in which the temperature is displayed (screen saver), or There is a state in which wallpaper that is not correlated with the screen on which the temperature is displayed is displayed. In addition, the above "no use of equipment"
(1) Each button of the operation unit 101 of the remote controller 1c is not operated, (2) hot water is not supplied at the hot water supply terminal, (3) the lid 103 of the remote controller 1c is not opened or closed, etc. It is out.

The temperature setting unit 112 sets the temperature of hot water supplied to the currant A, the shower B, and the bath C according to the operation of the temperature setting button 101a. Information related to the set temperature set by the temperature setting unit 112 is transmitted to the control unit 90 and used to adjust the opening of the hot water mixing valve 61 and the hot water supply mixing valve 71. Further, information related to the set temperature set by the temperature setting unit 112 is transmitted to the display control unit 111 and reflected in the set temperature displayed on the display unit 100.

The standby time changing unit 113 changes the time until the temperature display on the display unit 100 disappears (hereinafter referred to as standby time) according to the set temperature set by the temperature setting unit 112.
Specifically, as shown in FIG. 4, when the set temperature set by the temperature setting unit 112 is low (for example, less than 50 ° C.), the standby time changing unit 113 sets the standby time to the first standby time. When setting the time (for example, 10 minutes) and the set temperature set by the temperature setting unit 112 is high (for example, 50 ° C. or higher), the standby time is set to the second standby time (for example, 50 minutes).
Set to. In the present embodiment, the second standby time that is set when the set temperature is high is equal to or longer than the above-described opening holding time (first opening holding time, second opening holding time), and the standby time. The changing unit 113 sets the second standby time so that the temperature display on the display unit 100 disappears after the opening degree of the mixing valves 61 and 71 is driven to the water side when the set temperature is high.

The storage unit 114 is provided for storing various types of information. In this embodiment, the storage unit 114 includes information related to the set temperature set by the temperature setting unit 112 and the standby time changed by the standby time changing unit 113. Such information is stored.

The timer 115 is provided for measuring the current time and measuring the elapsed time. Information relating to the current time measured by the timer 115 is transmitted to the display control unit 111 and reflected in the date and time displayed on the display unit 100. Further, the timer 115 measures (1) a time during which each button of the operation unit 101 of the remote controller 1c is not operated (no operation elapsed time), or (2) a time when hot water is not supplied at the hot water supply terminal. (Elapsed time after the end of hot water supply) is measured, or (3) the time when the lid 103 of the remote controller 1c is not opened or closed (the elapsed time when the lid is not opened or closed) is measured.

The lid opening / closing detection unit 116 detects the opening / closing of the lid 103, and the detection result is obtained from the timer 11.
5 is used when measuring the lid unopen / close elapsed time. The lid open / close detection unit 11
6 is transmitted to the display control unit 111. For example, when the lid opening / closing detection unit 116 detects that the lid 103 is opened while the display unit 100 is turned off, the display control unit 11
1 turns on the display unit 100.

[Standby mode entry flow]
Next, with reference to the flowchart of FIG. 5, the operation until the standby mode in which the screen displaying the set temperature is turned off will be described.
First, when a set temperature or the like is displayed on the display unit 100 (step S1), it is determined whether or not the standby mode can be entered (step S2). For example, when a trial run is being performed, it is inconvenient if the screen of the display unit 100 is turned off, and the determination is made. When it is determined that the standby mode can be entered (step S2: Yes), the timer 115
(1) The time during which each button of the operation unit 101 of the remote controller 1c is not operated (no operation elapsed time), (2) the time during which no hot water is supplied to the hot water supply terminal (elapsed time after the end of hot water supply), and (3) Time when the lid 103 of the remote controller 1c is not opened / closed (elapsed time when the lid is not opened / closed)
Is measured (step S3). In the present embodiment, the timer 115 is (1) the remote controller 1c.
The elapsed time when each button of the operation unit 101 is not operated, (2) the hot water supply terminal is not heated, and (3) the lid 103 of the remote control 1c is not opened or closed. Counting. Then, when any of the above conditions (1), (2), and (3) is not satisfied during the counting, the counting ends. Hereinafter, (1) to (3
The elapsed time when all the conditions of () are satisfied is defined as “time when the device is not used”.

Next, it is determined whether or not the set temperature set by the temperature setting unit 112 is high (step S4). Specifically, it is determined whether the set temperature is equal to or higher than T_High (a preset constant, for example, 50 ° C.) (step S4). Therefore, the set temperature is T_Hi
If it is determined that it is greater than or equal to gh (step S4: Yes), the standby time is set to the second standby time (step S5). Specifically, a variable T_taiki indicating the waiting time is set to T_lo.
ng (a preset constant, for example, 50 minutes) is substituted.
On the other hand, when it is determined that the set temperature is lower than T_High (step S4: No), the standby time is set to the first standby time (step S6). Specifically, T_short (a preset constant, for example, 10 minutes) is set in a variable T_taiki indicating the waiting time.
Is substituted.

If the set temperature is equal to or higher than T_High (step S4: Yes), the timer 1
It is determined whether or not the time when the device is not used measured by 15 has passed the second standby time (T_long) (step S7), and the time when the device is not used is the second standby time (
When T_long) has elapsed (step S7: Yes), the standby mode is entered (
Step S9).
On the other hand, when the set temperature is lower than T_High (step S4: No), the timer 115
It is determined whether or not the time when the device is not used as measured by the first standby time (T_short) has passed (step S8), and the time when the device is not used is the first standby time (T
_Short) has passed (step S8: Yes), the standby mode is entered (
Step S9).

When the standby mode is entered (step S9), the display on the display unit 100 is turned off and the display unit 100 is turned off.
The set temperature displayed on the screen disappears (step S10). In addition, although the display on the display unit 100 is turned off here, as described above, the display unit 100 may be a screen saver or a wallpaper. Thereafter, it is determined whether or not the operation unit 101 has been operated (step S11). If the operation unit 101 has been operated (step S11).
: Yes), the process returns to step S1 and the display is performed on the display unit 100. When the operation of the operation unit 101 is not performed (step S11: No), the display unit 100 is continuously turned off (step S10).

[Characteristics of the water heater of this embodiment]
The water heater 1 of the present embodiment has the following characteristics.

In the water heater 1 of the present embodiment, when the set temperature is high, the standby time until the temperature is not displayed becomes long, so that the power saving and long life of the display unit 100 are ensured while ensuring the safety of the user. Can be achieved. In addition, when the set temperature is low, there is no concern that hot water unexpected by the user is supplied, so the standby time until the temperature is not displayed is shortened, and the display unit 100 can save power and have a long service life. Can be achieved.

Further, in the water heater 1 of the present embodiment, when the set temperature is high, the temperature is displayed until the mixing valves 61 and 71 are closed, so that it is possible to ensure the safety of the user. And
When the temperature is not displayed, the mixing valve is already closed, the temperature of the hot water in the pipe is lowered, and the opening degree of the mixing valves 61 and 71 is driven to the water side, so that hot water is suddenly supplied. There is nothing. As a result, the safety of the user can be ensured.

(Second Embodiment)
In the first embodiment, the case where the standby time has two patterns of the first standby time (T_short) or the second standby time (T_long) has been described, but in the second embodiment, the standby time has two patterns. The case where it is above is demonstrated. In addition, the description similar to 1st Embodiment is abbreviate | omitted suitably.

In the second embodiment, as shown in FIG. 6, after the time when the device is not used is measured by the timer 115, the set temperature T is determined (step S12). In the determination of the set temperature T, when the set temperature T is high (T ≧ T_High), the process proceeds to step S13. When the set temperature T is medium temperature (T_Low ≦ T <T_High), step S14 is performed.
If the set temperature T is low (T <T_Low), the process proceeds to step S15. When the set temperature T is high (T ≧ T_High), the standby time is set to T_long (step S13), and when the set temperature is medium temperature (T_Low ≦ T <T_High), the standby time is set. T_middle is set (step S14), and the set temperature is low (T
If <T_Low), the standby time is set to T_short (step S15).

When the set temperature is high (T ≧ T_High), it is determined whether or not the time when the device is not used measured by the timer 115 has passed the standby time (T_long) (
If the time when the device is not used has passed the standby time (T_long) (step S16: Yes), the standby mode is entered (step S9).
Further, when the set temperature is medium temperature (T_Low ≦ T <T_High), it is determined whether or not the time when the device is not used measured by the timer 115 has passed the waiting time (T_middle) (step S17). , The time when the device is not used is the waiting time (T_midd
le) has elapsed (step S17: Yes), the standby mode is entered (step S9).
When the set temperature is low (T <T_Low), it is determined whether or not the time when the device is not used as measured by the timer 115 has passed the standby time (T_short) (step S18). When the time when the device is not used has passed the standby time (T_short) (step S18: Yes), the standby mode is entered (step S9).

Thus, in this embodiment, the standby time is (1) T_long, according to the set temperature T.
(2) T_middle and (3) T_short are divided into three patterns. Thereby, compared with 1st Embodiment, it becomes possible to control finely the time until the display part 100 turns off.

(Third embodiment)
In the first embodiment and the second embodiment, the waiting time is set to a predetermined value (T_long, T
In the third embodiment, the standby time may be calculated by a function using the set temperature T as a variable. In addition, the description similar to 1st Embodiment is abbreviate | omitted suitably.

In the third embodiment, as shown in FIG. 7, after the time when the device is not used is measured by the timer 115, the waiting time T_taiki is set by the function T_taiki = f (T) using the set temperature T as a variable. Calculate (step S21). Then, it is determined whether or not the time when the device is not used measured by the timer 115 has passed the standby time (T_taiki) calculated by the above function (step S22), and the time when the device is not used is waited. time(
If T_taiki) has elapsed (step S22: Yes), the standby mode is entered (step S9).

As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

For example, in the above-described embodiment, the “time when the device is not used” is defined as follows: (1) the buttons of the operation unit 101 of the remote controller 1c are not operated; (2) hot water is not supplied at the hot water supply terminal; (3) Although it is defined as the elapsed time when all three conditions that the lid 103 of the remote controller 1c is not opened and closed are satisfied, the present invention is not limited to this, and the condition including the condition (2) is satisfied. The elapsed time when the operation is performed may be “time when the device is not used”.

By using the present invention, when the set temperature is high, the time until the temperature is not displayed is set longer, thereby ensuring the safety of the user and reducing the power consumption and the life of the display unit. It is possible to obtain a hot water supply system (hot water heater) that can be achieved.

1 Water heater (hot water supply system)
1a Heat pump unit 1b Hot water storage unit 1c Remote control (controller)
20 Hot water storage tank 61 Hot water mixing valve (mixing valve)
71 Hot water mixing valve (mixing valve)
DESCRIPTION OF SYMBOLS 100 Display part 101 Operation part 110 Control part 111 Display control part (display control means)
112 Temperature setting unit (temperature setting means)
113 Waiting time changing unit (waiting time changing means)

Claims (5)

A hot water storage tank,
Temperature setting means for setting the temperature of hot water supplied from the hot water storage tank;
A display for displaying the temperature set by the temperature setting means;
When hot water is not supplied for a predetermined time, display control means for turning off the temperature display on the display unit,
Waiting time changing means for changing a waiting time, which is a time until the temperature display on the display unit disappears, when hot water supply is not performed after hot water supply is finished according to the temperature set by the temperature setting means. A hot water supply system comprising: The waiting time changing means sets the waiting time to a first waiting time when the temperature set by the temperature setting means is lower than a predetermined temperature, and the temperature set by the temperature setting means is the predetermined temperature. In the above case, the warm water supply system according to claim 1, wherein the standby time is set to a second standby time longer than the first standby time. A mixing valve for mixing hot water supplied from the hot water storage tank and water supplied from a water supply source;
The mixing valve keeps its opening at the opening at the time of the previous hot water supply until a predetermined time elapses after the hot water supply is stopped. Drive to the side
The hot water supply system according to claim 2, wherein the standby time changing means sets the second standby time to the predetermined time or more. A controller for controlling the hot water from the hot water storage tank,
Temperature setting means for setting the temperature of hot water supplied from the hot water storage tank;
A display for displaying the temperature set by the temperature setting means;
When hot water is not supplied for a predetermined time, display control means for turning off the temperature display on the display unit,
Waiting time changing means for changing a waiting time, which is a time until the temperature display on the display unit disappears, when hot water supply is not performed after hot water supply is finished according to the temperature set by the temperature setting means. A controller, comprising: a controller. In a display unit that displays a set temperature of hot water to be supplied, and a controller that turns off the temperature display of the display unit when hot water is not supplied for a predetermined time,
A controller, wherein after the hot water supply is finished, when no hot water supply is performed , a standby time which is a time until the temperature display on the display unit disappears is changed according to the set temperature.

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