JP2012032034A - Liquid supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid supply device capable of supplying hot water to a first terminal and a second terminal while maintaining the supply pressure of heated liquid, and supplying hot water at different temperatures to the first terminal and the second terminal.SOLUTION: When a first preset temperature is higher than a second preset temperature at the time of simultaneous hot water supply to the first terminal 71 and the second terminal 72, a control means 60 controls a pump 3 so that the sensed temperature by a secondary outlet temperature sensor 53 reaches a temperature corresponding to the first preset temperature, fully opens the high temperature heated liquid side of a first mixing valve 6, and controls a second mixing valve 7 so that the sensed temperature by a second temperature sensor 55 reaches a temperature corresponding to the second preset temperature.

Description

  The present invention relates to a liquid supply apparatus that heats a liquid to be heated to a predetermined temperature and supplies the liquid to a terminal.

  As a liquid supply apparatus, a hot water supply apparatus that heats tap water and supplies the hot water to a hot water supply terminal or the like is known. When the water heater operates the heat pump unit using discounted electricity charges at night, heats room temperature tap water and stores it as hot water (hot water) in a hot water storage tank, and opens the faucet when using hot water during the day A hot water storage type heat pump water heater is generally used that takes out hot water from a hot water storage tank and mixes it with normal temperature tap water to supply hot water as a suitable temperature water. In this water heater, in order to protect the pressure of the hot water storage tank, tap water with a high water pressure from the water pipe is decompressed by a pressure reducing valve or a cistern tank and introduced from the lower part of the hot water tank, while hot water is supplied from the upper part of the hot water tank. Take out.

  There is also known a water heater that indirectly supplies hot water with a high-temperature heat medium to supply hot water to a hot water supply terminal as a high-temperature heated liquid. For example, Patent Document 1 includes a hot water supply heat exchanger that indirectly heats tap water using hot water in a hot water storage tank as a heat medium, and hot water in the hot water storage tank (heat medium) on the primary side of the hot water heat exchanger. ) With a hot water supply pump, and tap water is supplied to the secondary side of the hot water heat exchanger with tap pressure to exchange heat, and the flow rate on the primary side is controlled so that the tap water reaches a predetermined temperature (ie, hot water supply). A water heater is disclosed that controls the rotational speed of the pump.

  Patent Document 2 discloses a water heater that indirectly supplies hot water with a high-temperature heat medium and supplies hot water to a hot water supply terminal and a bathtub terminal, respectively. In this water heater, one heat exchanger is shared to supply hot water to the hot water terminal and the bathtub terminal.

JP 2006-162166 A JP 2005-207672 A

  However, Patent Document 2 does not disclose any method for simultaneously supplying hot water to a hot water supply terminal and a bathtub terminal using a single heat exchanger. Therefore, in the water heater of patent document 2, when preset temperature differs in a hot water supply terminal and a bathtub terminal, there exists a problem that it cannot supply simultaneously.

  Therefore, the present invention can share one heat exchanger to indirectly heat the heated liquid with a high-temperature heat medium and supply it to the first terminal and the second terminal as the high-temperature heated liquid, It is another object of the present invention to provide a liquid supply apparatus that can simultaneously supply liquids having different temperatures between the first terminal and the second terminal.

  In order to solve such a problem, the liquid supply apparatus according to the present invention generates a high-temperature heated liquid by heating the heated liquid flowing through the secondary side with a high-temperature heat medium flowing through the primary side. A heat exchanger, a pump that distributes the heat medium to a primary side of the heat exchanger, the high-temperature heated liquid, and a low-temperature heated liquid that is lower in temperature than the high-temperature heated liquid. A first mixing valve for supplying heated liquid to the first terminal, a second mixing valve for mixing the high temperature heated liquid and the low temperature heated liquid, and supplying the mixed heated liquid to the second terminal; A secondary-side outlet temperature sensor that detects the temperature of the high-temperature heated liquid generated in the heat exchanger, and a first that detects the temperature of the heated liquid supplied from the first mixing valve to the first terminal. A temperature sensor and an object supplied from the second mixing valve to the second terminal; A second temperature sensor for detecting the temperature of the hot liquid; and a control means for controlling the pump, the first mixing valve, and the second mixing valve, wherein the heated liquid heated to the first set temperature is the first A liquid supply apparatus that supplies a heated liquid that has been supplied to a terminal and heated to a second set temperature to a second terminal, wherein the control means is simultaneously supplied to the first terminal and the second terminal. When the first preset temperature is higher than the second preset temperature, the pump is controlled so that the detected temperature of the secondary side outlet temperature sensor becomes a temperature corresponding to the first preset temperature, The opening of the first mixing valve on the high-temperature heated liquid side is fully opened, and the second mixing valve is controlled so that the temperature detected by the second temperature sensor becomes a temperature corresponding to the second set temperature. It is characterized by that.

  In addition, the liquid supply apparatus according to the present invention includes a heat exchanger that heats a heated liquid that circulates on the secondary side with a high-temperature heat medium that circulates on the primary side, and generates the high-temperature heated liquid; A pump for circulating a medium to the primary side of the heat exchanger, the high temperature heated liquid, and a low temperature heated liquid lower in temperature than the high temperature heated liquid are mixed, and the mixed heated liquid is supplied to the first terminal A first mixing valve that mixes the high temperature heated liquid and the low temperature heated liquid and supplies the mixed heated liquid to the second terminal, and is generated by the heat exchanger. A secondary side outlet temperature sensor for detecting a temperature of the high temperature heated liquid, a first temperature sensor for detecting a temperature of the heated liquid supplied from the first mixing valve to the first terminal, and the second mixing. A second temperature sensor for detecting a temperature of the heated liquid supplied from the valve to the second terminal; A temperature sensor; and a control unit that controls the pump, the first mixing valve, and the second mixing valve. The heated liquid heated to the first set temperature is supplied to the first terminal, and the second set temperature is set. A liquid supply apparatus for supplying a heated liquid heated to a second terminal, wherein the control means is configured to set the first set temperature to the first terminal and the second terminal at the same time when the first set temperature is When the temperature is lower than the second set temperature, the pump is controlled so that the detected temperature of the secondary side outlet temperature sensor becomes a temperature corresponding to the second set temperature, and the high temperature heated of the second mixing valve The opening on the liquid side is fully opened, and the first mixing valve is controlled so that the temperature detected by the first temperature sensor becomes a temperature corresponding to the first set temperature.

  In the liquid supply apparatus according to the present invention, when the first mixing valve fails during simultaneous supply to the first terminal and the second terminal, the control means detects the temperature detected by the first temperature sensor. The pump is controlled to have a temperature corresponding to the first set temperature. Further, the control means may be configured such that when the first mixing valve fails during the simultaneous supply to the first terminal and the second terminal and the first set temperature is higher than the second set temperature, The second mixing valve is controlled so that a temperature detected by a temperature sensor becomes a temperature corresponding to the second set temperature.

  Further, in the liquid supply apparatus according to the present invention, the control means detects the temperature detected by the second temperature sensor when the second mixing valve fails during simultaneous supply to the first terminal and the second terminal. The pump is controlled to have a temperature corresponding to the second set temperature. Furthermore, the control means is configured such that when the second mixing valve fails during the simultaneous supply to the first terminal and the second terminal, and the second set temperature is higher than the first set temperature, The first mixing valve is controlled such that a temperature detected by a temperature sensor becomes a temperature corresponding to the first set temperature.

  According to the present invention, one heat exchanger can be shared to supply the first liquid and the second terminal as a high temperature heated liquid by indirectly heating the heated liquid with a high temperature heat medium, Furthermore, it is possible to provide a liquid supply apparatus that can simultaneously supply liquids having different temperatures between the first terminal and the second terminal.

1 is a schematic configuration diagram of a water heater according to a first embodiment. It is a functional block diagram of the water heater based on 1st Embodiment. It is a flowchart which shows the bathtub solenoid valve control which concerns on 1st Embodiment. It is a flowchart which shows the hot water filling completion determination which concerns on 1st Embodiment. It is a flowchart which shows temperature control start determination of the water heater based on 1st Embodiment. It is a flowchart which shows the supply temperature control of the hot water in the case where the water heater which concerns on 1st Embodiment supplies hot water to a hot water supply terminal. It is a flowchart which shows the supply temperature control of the hot water in the case where the water heater based on 1st Embodiment supplies hot water to a bathtub terminal. It is a flowchart which shows the supply temperature control of the hot water in the case where the water heater based on 1st Embodiment supplies hot water to a hot water supply terminal and a bathtub terminal. It is a flowchart which shows the bathtub mixing valve temperature control in FIG. It is a flowchart which shows the hot water mixing valve temperature control in FIG. It is a flowchart which shows supply temperature control of the hot water in the case of the hot water supply concerning a modification supplying hot water to a bathtub terminal. It is a flowchart which shows the hot water supply mixing valve opening degree control of the hot water supply machine which concerns on a modification. It is a flowchart which shows the bathtub solenoid valve control which concerns on 2nd Embodiment. It is a flowchart which shows the mixing valve failure determination of the water heater based on 2nd Embodiment. It is a flowchart which shows the hot water supply mixing valve failure time control of the water heater which concerns on 2nd Embodiment. It is a flowchart which shows the hot water supply terminal supply control at the time of the hot water supply mixing valve failure of the water heater based on 2nd Embodiment. It is a flowchart which shows the hot water supply and bathtub terminal supply control at the time of the hot water supply mixing valve failure of the water heater which concerns on 2nd Embodiment. It is a flowchart which shows the control at the time of the bathtub mixing valve failure of the water heater based on 2nd Embodiment. It is a flowchart which shows the bathtub terminal supply control at the time of the bathtub mixing valve failure of the water heater based on 2nd Embodiment. It is a flowchart which shows the hot water supply and bathtub terminal supply control at the time of the bathtub mixing valve failure of the water heater which concerns on 2nd Embodiment. It is a flowchart which shows the hot water supply terminal priority control of the water heater based on 2nd Embodiment.

  Hereinafter, modes for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the drawings as appropriate. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

<< First Embodiment >>
FIG. 1 is a schematic configuration diagram of a water heater S according to the first embodiment.
The water heater S includes a hot water tank unit 10 having a hot water storage tank 1, a heat pump refrigerant circuit (not shown) and a water refrigerant heat exchanger (not shown), and water (heat medium) inside the hot water tank 1. A heat pump unit 30 for heating and an operation unit 40 are provided, and the tap water supplied from the water pipe is adjusted to a temperature set by the operation unit 40 and supplied to the hot water supply terminal 71 and the bathtub terminal 72.

  The hot water storage tank unit 10 of the hot water heater S includes a hot water storage tank 1, a hot water supply heat exchanger 2, a hot water supply circulation pump 3, a pressure reducing valve 4, a three-way valve 5, a hot water supply mixing valve 6, a bathtub mixing valve 7, The bathtub electromagnetic valve 8, check valves 9 </ b> A to 9 </ b> E, various sensors (50 to 59), and a control device 60 are provided.

The high-pressure tap water supplied from the water pipe passes through the check valve 9A and is depressurized by the pressure reducing valve 4. The depressurized tap water passes through the check valve 9B and is supplied into the hot water storage tank 1 from a pipe connected to the lower part of the hot water storage tank 1.
By switching the three-way valve 5 so that the lower side of the hot water storage tank 1 communicates with the incoming water side of the heat pump unit 30 and driving the heat pump unit 30, the heat medium (heat transfer water) inside the hot water storage tank 1 is stored in hot water. Water enters the heat pump unit 30 from a pipe connected to the lower part of the tank 1 and is heated in the heat pump unit 30. Hot water heated by the heat pump unit 30 is stored in the hot water storage tank 1 from the upper part of the hot water storage tank 1 as a heat medium (heat medium water).

  In addition, the hot water storage tank unit 10 and the heat pump unit 30 are connected by switching the three-way valve 5 so that the outlet side of the heat pump unit 30 communicates with the incoming side of the heat pump unit 30 and driving the heat pump unit 30. It is possible to prevent high temperature hot water from flowing into the piping to be frozen and freezing of the piping connecting the units.

By driving the hot water supply circulation pump 3, the heat medium flows from the upper part of the hot water storage tank 1 into the primary inlet of the hot water supply heat exchanger 2 and heats the tap water flowing on the secondary side of the hot water supply heat exchanger 2 described later. To do. The heat medium flowing out from the outlet on the primary side of the hot water supply heat exchanger 2 is sucked into the hot water supply circulation pump 3 and sent to the lower part of the hot water storage tank 1 through the check valve 9C.
The hot water supply circulation pump 3 starts driving when the secondary side outlet flow rate detected by the secondary side outlet flow rate sensor 56 described later is larger than zero, and stops driving when the secondary side outlet flow rate becomes zero. The rotational speed of the hot water supply circulation pump 3 is controlled by the control device 60.

  A pipe connecting the upper part of the hot water storage tank 1 and the primary side inlet of the hot water supply heat exchanger 2 is provided with a primary side inlet temperature sensor 50 that detects the temperature of the heat medium flowing into the primary side of the hot water supply heat exchanger 2. ing. In addition, a piping connecting the primary outlet of the hot water heat exchanger 2 and the hot water circulation pump 3 is provided with a primary outlet temperature sensor 51 that detects the temperature of the heat medium flowing out from the primary side of the hot water heat exchanger 2. It has been.

  The high-pressure tap water supplied from the water pipe does not go through the pressure reducing valve 4 and remains at a high water pressure, the secondary side inlet of the hot water heat exchanger 2, the water side inlet of the hot water mixing valve 6, and the bathtub mixing It is supplied to the water side inlet of the valve 7. A water temperature sensor 52 that detects the temperature of tap water supplied to the water heater S is provided.

  The tap water flowing from the secondary side inlet of the hot water supply heat exchanger 2 is heated by the hot water supply heat exchanger 2 and flows out from the secondary side outlet. This outflowed hot water (heated tap water) is supplied to the hot water supply mixing valve 6 and the bathtub mixing valve 7. The temperature of hot water flowing out from the secondary side outlet of the hot water supply heat exchanger 2 controls the flow rate of the heat medium flowing through the primary side of the hot water supply heat exchanger 2, that is, the rotational speed of the hot water supply circulation pump 3. Can be adjusted.

  On the secondary side outlet side of the hot water supply heat exchanger 2, a secondary side outlet temperature sensor 53 that detects the temperature of hot water flowing out from the secondary side outlet, and a flow rate of hot water flowing out from the secondary side outlet are detected. A secondary outlet flow rate sensor 56 is provided.

The hot water supply mixing valve 6 mixes hot water (heated tap water) flowing out from the secondary side outlet of the hot water supply heat exchanger 2 and normal temperature water (unheated tap water) and supplies the mixed hot water to a hot water supply terminal 71. To supply.
In the pipe connecting the outlet side of the hot water mixing valve 6 and the hot water supply terminal 71, a hot water temperature sensor 54 for detecting the temperature of hot water supplied to the hot water supply terminal 71 and a flow rate of hot water supplied to the hot water supply terminal 71 are detected. A hot water supply flow rate sensor 57 is provided.

The bathtub mixing valve 7 mixes hot water (heated tap water) flowing out from the secondary side outlet of the hot water supply heat exchanger 2 and room temperature water (unheated tap water), and mixes the hot water into the bathtub terminal. 72.
The pipe connecting the outlet side of the bathtub mixing valve 7 and the bathtub terminal 72 has a bathtub temperature sensor 55 that detects the temperature of hot water supplied to the bathtub terminal 72 and a flow rate of hot water supplied to the bathtub terminal 72. The bathtub flow rate sensor 58 to perform and the water level sensor 59 to detect the water level of the bathtub terminal 72 are provided. In addition, check valves 9D and 9E are provided to prevent backflow from the bathtub terminal 72.

  The hot water supply mixing valve 6 and the bathtub mixing valve 7 have a water side opening that decreases when the hot water side opening is increased, and the water side opening that is fully open when the hot water side opening is fully opened. In other words, when the hot water side opening is reduced, the water side opening is increased, and when the hot water side opening is fully closed, the water side opening is fully opened. That is, the hot water supply mixing valve 6 and the bathtub mixing valve 7 can discharge from the outlet side by changing the mixing ratio of hot water and water by adjusting the hot water side opening and the water side opening. The mixing ratio (hot water side opening, water side opening) of hot water mixing valve 6 and bathtub mixing valve 7 is controlled by control device 60.

  In addition, the hot water supply mixing valve 6 and the bathtub mixing valve 7 transmit an initial position signal indicating that the built-in valve body is the initial position when the hot water side opening is fully closed (water side opening is fully open). It has a function to do. Thereby, the control device 60 (failure determination unit 66), which will be described later, transmits an initial position signal within a predetermined time when a signal for fully closing the hot water side opening degree is transmitted to the hot water supply mixing valve 6 (tub combination valve 7). It is possible to detect whether or not the hot water supply mixing valve 6 and the bathtub mixing valve 7 are out of order due to sticking of the valve body or the like.

  A pipe that connects the outlet side of the bathtub mixing valve 7 and the bathtub terminal 72 is provided with a bathtub electromagnetic valve 8 that can block communication between the outlet side of the bathtub mixing valve 7 and the bathtub terminal 72. The bathtub solenoid valve 8 is a normally closed solenoid valve whose opening and closing is controlled by the control device 60.

  The operation units 40 such as the kitchen remote control terminal 41 and the bathtub remote control terminal 42 have a hot water supply set temperature that is a set temperature of hot water supplied to the hot water supply terminal 71, a bath set temperature that is a set temperature of hot water supplied to the bathtub terminal 72, And it is an apparatus for inputting the filling request to fill the bathtub terminal 72. Then, the operation unit 40 transmits the hot water supply set temperature, the bathtub set temperature, and the hot water filling request input (set) by the user to the control device 60.

<Control device 60>
The control device 60 sets the temperature of the hot water supplied to the hot water supply terminal 71 to the hot water supply set temperature set by the operation unit 40 and sets the temperature of the hot water supplied to the bathtub terminal 72 using the operation unit 40. The hot water storage tank unit 10 and the like are controlled so that the set temperature is the same. In addition, when a filling request is set by the operation unit 40, the control device 60 fills the bathtub terminal 72.

FIG. 2 is a functional block diagram of the water heater S according to the first embodiment.
The control device 60 is constituted by a microcomputer, and includes various sensors (primary side inlet temperature sensor 50, primary side outlet temperature sensor 51, water supply temperature sensor 52, secondary side outlet temperature sensor 53, hot water supply temperature sensor 54, bathtub temperature sensor 55. , Secondary side outlet flow sensor 56, hot water supply flow sensor 57, bathtub flow sensor 58, water level sensor 59), and receives various information signals. Control device 60 is communicably connected to kitchen remote control terminal 41 and bathtub remote control terminal 42, and receives the hot water supply set temperature, bathtub set temperature and hot water filling request set at kitchen remote control terminal 41 and bathtub remote control terminal 42. .

  The control device 60 includes a hot water supply target determination unit 61, a setting storage unit 62, a temperature control unit 63, a bathtub electromagnetic valve control unit 64, and a hot water filling completion determination unit 65. Moreover, the failure determination part 66 demonstrated in 2nd Embodiment is provided. The hot water supply target determination unit 61 has a function of determining a terminal where hot water is used among the hot water supply terminal 71 and the bathtub terminal 72. The setting storage unit 62 has a function of storing the hot water supply set temperature, the bathtub set temperature, and the hot water filling request set by the kitchen remote control terminal 41 and the bathtub remote control terminal 42. Moreover, it has the function to memorize | store the hot water supply priority request | requirement demonstrated by 2nd Embodiment. The temperature control unit 63 rotates the hot water supply circulation pump 3, the opening degree of the hot water supply mixing valve 6, and the bathtub mixing based on various information signals from various sensors and the hot water supply set temperature and the bathtub set temperature stored in the setting storage unit 62. It has a function of controlling the opening degree of the valve 7. The bathtub solenoid valve control unit 64 has a function of controlling opening and closing of the hot water solenoid valve 8 based on the hot water filling request (and the hot water priority request described in the second embodiment) stored in the setting storage unit 62. The hot water filling completion determination unit 65 has a function of determining whether the hot water filling of the bathtub terminal 72 has been completed and resetting the hot water filling request stored in the setting storage unit 62. The failure determination unit 66 has a function of determining failure of the hot water supply mixing valve 6 and the bathtub mixing valve 7. The control device 60 also has a function of controlling the heat pump unit 30 and the three-way valve 5.

<Bathroom at bathtub terminal>
The hot water filling of the bathtub terminal 72 will be described with reference to FIGS. 3 and 4.

First, the control of the bathtub electromagnetic valve 8 executed by the bathtub electromagnetic valve control unit 64 of the control device 60 will be described. FIG. 3 is a flowchart showing bathtub electromagnetic valve control according to the first embodiment.
In step S <b> 11, the bathtub solenoid valve control unit 64 of the control device 60 determines whether or not a “hot water filling request” is stored in the setting storage unit 62. When the “hot water filling request” is stored (S11 / Yes), the processing of the bathtub solenoid valve control unit 64 proceeds to step S13. On the other hand, when the “hot water filling request” is not stored (S11 / No), the processing of the bathtub solenoid valve control unit 64 proceeds to step S14.
In step S <b> 13, the bathtub electromagnetic valve control unit 64 opens the bathtub electromagnetic valve 8. Then, the process of the bathtub solenoid valve control part 64 returns to step S11.
In step S <b> 14, the bathtub electromagnetic valve control unit 64 closes the bathtub electromagnetic valve 8. Then, the process of the bathtub solenoid valve control part 64 returns to step S11.

Next, the hot water filling completion determination of the bathtub terminal 72 performed by the hot water filling completion determination unit 65 of the control device 60 will be described. FIG. 4 is a flowchart showing filling completion determination according to the first embodiment.
In step S21, the hot water filling completion determination unit 65 of the control device 60 determines whether or not the hot water filling is completed. The determination of completion of hot water filling may be made when hot water filling is completed when the water level of the bathtub terminal 72 detected by the water level sensor 59 is equal to or higher than a predetermined water level, and the bathtub detected by the bathtub flow sensor 58. When the value obtained by integrating the flow rate of hot water supplied to the terminal 72 with time is equal to or greater than a predetermined value, it may be determined that the hot water filling is completed. When the hot water filling is completed (S21 / Yes), the hot water filling completion determination unit 65 proceeds to step S22. On the other hand, when the hot water filling is not completed (No in S21), the processing of the hot water filling completion determination unit 65 returns to step S21.
In step S <b> 22, the hot water filling completion determination unit 65 deletes (resets) the “hot water filling request” stored in the setting storage unit 62. Thereafter, the processing of the hot water filling completion determination unit 65 is terminated.

A series of operations related to hot water filling of the bathtub terminal 72 will be described.
When the user operates the operation unit 40 (kitchen remote control terminal 41, bathtub remote control terminal 42) and inputs (sets) “hot water filling request”, the operation unit 40 sends a signal indicating “hot water filling request” to the control device 60. Send. The control device 60 that has received the signal from the operation unit 40 registers “hot water filling request” in the setting storage unit 62.
When the “hot water filling request” is registered in the setting storage unit 62, the bathtub electromagnetic valve control unit 64 opens the bathtub electromagnetic valve 8 (S13). Thereby, hot water is supplied to the bathtub terminal 72 from the outlet side of the bathtub mixing valve 7, and hot water filling is performed. In addition, when the “hot water filling request” is registered in the setting storage unit 62, the hot water filling completion determination unit 65 is activated to execute the hot water filling completion determination (S21).
When the hot water filling completion determination unit 65 determines the hot water filling completion, the “hot water filling request” registered in the setting storage unit 62 is deleted (S22).
When the “hot water filling request” is deleted from the setting storage unit 62, the bathtub electromagnetic valve control unit 64 closes the bathtub electromagnetic valve 8 (S14). Thereby, the supply of hot water from the outlet side of the bathtub mixing valve 7 to the bathtub terminal 72 is stopped, and the filling of the bathtub terminal 72 is completed.

<Temperature control>
Next, temperature control executed by the control device 60 of the water heater S according to the first embodiment will be described with reference to FIGS.

<Temperature control start judgment>
FIG. 5 is a flowchart illustrating temperature control start determination of the water heater S according to the first embodiment.
In step S <b> 101, the hot water supply target determination unit 61 of the control device 60 determines whether hot water is being supplied from the water heater S to the hot water supply terminal 71. Specifically, it is determined whether or not the hot water supply flow rate sensor 57 detects the flow rate. Note that the detection of the flow rate is a case where the detected flow rate is greater than zero. When the hot water supply flow rate is detected (S101, Yes), the process of the control device 60 proceeds to step S102. On the other hand, when the hot-water supply flow rate is not detected (the hot-water supply flow rate is 0) (S101, No), the process of the control device 60 proceeds to step S103.
In step S <b> 102, the hot water supply target determination unit 61 determines whether hot water is supplied from the water heater S to the bathtub terminal 72. Specifically, it is determined whether the bathtub flow rate sensor 58 has detected the flow rate. When the bathtub flow rate is detected (S102 / Yes), the process of the control device 60 proceeds to step S106. On the other hand, when the bathtub flow rate is not detected (the bathtub flow rate is 0) (S102 / No), the process of the control device 60 proceeds to step S104.
In step S <b> 103, the hot water supply target determination unit 61 determines whether hot water is being supplied from the water heater S to the bathtub terminal 72. Specifically, it is determined whether the bathtub flow rate sensor 58 has detected the flow rate. When the bathtub flow rate is detected (S103 / Yes), the process of the control device 60 proceeds to step S105. On the other hand, when the bathtub flow rate is not detected (No at S103), the process of the control device 60 returns to Step S101.

In step S <b> 104, control device 60 performs “hot water supply terminal supply control” for controlling the temperature of hot water supplied to hot water supply terminal 71. The “hot water supply terminal supply control” will be described later with reference to FIG. Thereafter, the process of the control device 60 returns to step S101.
In step S <b> 105, the control device 60 performs “tub terminal supply control” for controlling the temperature of hot water supplied to the bathtub terminal 72. The “tub terminal supply control” will be described later with reference to FIG. Thereafter, the process of the control device 60 returns to step S101.
In step S <b> 106, control device 60 performs “hot water / tub terminal supply control” for controlling the temperature of hot water supplied to hot water terminal 71 and bathtub terminal 72. The “hot water / tub terminal supply control” will be described later with reference to FIG. Thereafter, the process of the control device 60 returns to step S101.

<Hot water supply terminal supply control>
The “hot water supply terminal supply control” shown in step S104 of FIG. 5 will be described with reference to FIG. FIG. 6 is a flowchart showing supply temperature control of hot water when the water heater S according to the first embodiment supplies hot water to the hot water supply terminal.
In step S201, the temperature control unit 63 of the control device 60 controls the hot water supply mixing valve 6 so that the hot water side opening of the hot water supply mixing valve 6 is fully opened (so that the water side opening is fully closed). .
In step S <b> 202, the temperature control unit 63 detects the temperature of the hot water flowing out from the secondary side outlet of the hot water supply heat exchanger 2 by the secondary side outlet temperature sensor 53.

In step S203, the temperature control unit 63 determines whether or not the temperature detected by the secondary side outlet temperature sensor 53 detected in step S202 is higher than the hot water supply set temperature. When the detected temperature is higher than the hot water supply set temperature (S203 / Yes), the process of the temperature control unit 63 proceeds to step S205. On the other hand, when the detected temperature is not higher than the hot water supply set temperature (No at S203), the process of the temperature control unit 63 proceeds to step S204.
In step S204, the temperature control unit 63 determines whether or not the detected temperature is lower than the hot water supply set temperature. When the detected temperature is lower than the hot water supply set temperature (S204 / Yes), the process of the temperature control unit 63 proceeds to step S206. On the other hand, when the detected temperature is not lower than the hot water supply set temperature (No in S204), the process of the temperature control unit 63 proceeds to Step S207.

In step S205, the temperature control unit 63 performs control to reduce the rotation speed of the hot water supply circulation pump 3 so that the detected temperature decreases to the hot water supply set temperature.
In step S206, the temperature control unit 63 performs control to increase the rotation speed of the hot water supply circulation pump 3 so that the detected temperature increases to the hot water supply set temperature.
In step S207, the temperature control unit 63 maintains the rotational speed of the hot water supply circulation pump 3 as it is.

  And the process of the control apparatus 60 complete | finishes (end) the "hot-water supply terminal supply control" (S104 shown in FIG. 5) shown in FIG. 6, and returns to step S101 of FIG.

<Bathtub terminal supply control>
The “tub terminal supply control” shown in step S105 of FIG. 5 will be described with reference to FIG. FIG. 7 is a flowchart showing hot water supply temperature control when the hot water heater S according to the first embodiment supplies hot water to the bathtub terminal.
In step S301, the temperature control unit 63 of the control device 60 controls the bathtub mixing valve 7 so that the hot water side opening of the bathtub mixing valve 7 is fully opened (so that the water side opening is fully closed). .
In step S <b> 302, the temperature control unit 63 detects the temperature of the hot water flowing out from the secondary side outlet of the hot water supply heat exchanger 2 with the secondary side outlet temperature sensor 53.

In step S303, the temperature control unit 63 determines whether or not the detected temperature of the secondary outlet temperature sensor 53 detected in step S302 is higher than the bathtub set temperature. When the detected temperature is higher than the bathtub set temperature (S303 / Yes), the process of the temperature control unit 63 proceeds to step S305. On the other hand, when the detected temperature is not higher than the bathtub set temperature (No in S303), the process of the temperature control unit 63 proceeds to Step S304.
In step S304, the temperature control unit 63 determines whether or not the detected temperature is lower than the bathtub set temperature. When the detected temperature is lower than the bathtub set temperature (S304 / Yes), the process of the temperature control unit 63 proceeds to step S306. On the other hand, when the detected temperature is not lower than the bathtub set temperature (S304, No), the process of the temperature control unit 63 proceeds to step S307.

In step S305, the temperature control unit 63 performs control to reduce the rotation speed of the hot water supply circulation pump 3 so that the detected temperature is lowered to the bathtub set temperature.
In step S306, the temperature control unit 63 performs control to increase the rotation speed of the hot water supply circulation pump 3 so that the detected temperature rises to the bathtub set temperature.
In step S307, the temperature control unit 63 maintains the rotational speed of the hot water supply circulation pump 3 as it is.

  And the process of the control apparatus 60 complete | finishes (ends) the "tub terminal supply control" (S105 shown in FIG. 5) shown in FIG. 7, and returns to step S101 of FIG.

<Hot water supply / tub terminal supply control>
"Hot water supply / tub terminal supply control" shown in step S106 of FIG. 5 will be described with reference to FIG. FIG. 8 is a flowchart showing supply temperature control of hot water when the water heater S according to the first embodiment supplies hot water to the hot water supply terminal and the bathtub terminal.
In step S401, the temperature control unit 63 determines whether the hot water supply set temperature is higher than the bathtub set temperature. When the hot water supply set temperature is higher than the bathtub set temperature (S401, Yes), the process of the temperature control unit 63 proceeds to step S403. On the other hand, when the hot water supply set temperature is not higher than the bathtub set temperature (No in S401), the process of the temperature control unit 63 proceeds to step S402.
In step S402, temperature control unit 63 determines whether or not the hot water supply set temperature is equal to the bathtub set temperature. When the hot water supply set temperature is as high as the bath set temperature (S402 / Yes), the process of the temperature control unit 63 proceeds to step S411. On the other hand, when the hot water supply set temperature is not equal to the bathtub set temperature (No in S402), the process of the temperature control unit 63 proceeds to step S412.

In step S403, the temperature control unit 63 controls the hot water supply mixing valve 6 so that the hot water side opening of the hot water supply mixing valve 6 is fully opened (so that the water side opening is fully closed).
In step S <b> 404, the temperature control unit 63 performs “tub mixing valve temperature control” for controlling the temperature of hot water supplied to the bathtub terminal 72. The “tub mixing valve temperature control” will be described later with reference to FIG. Thereafter, the process of the temperature control unit 63 proceeds to step S405.

In step S <b> 405, the temperature control unit 63 detects the temperature of the hot water flowing out from the secondary side outlet of the hot water supply heat exchanger 2 by the secondary side outlet temperature sensor 53.
In step S406, the temperature control unit 63 determines whether or not the detected temperature of the secondary side outlet temperature sensor 53 detected in step S405 is higher than the hot water supply set temperature. When the detected temperature is higher than the hot water supply set temperature (S406, Yes), the process of the temperature control unit 63 proceeds to step S408. On the other hand, if the detected temperature is not higher than the hot water supply set temperature (No in S406), the process of the temperature control unit 63 proceeds to step S407.
In step S407, the temperature control unit 63 determines whether or not the detected temperature is lower than the hot water supply set temperature. When the detected temperature is lower than the hot water supply set temperature (S407 / Yes), the process of the temperature control unit 63 proceeds to step S409. On the other hand, when the detected temperature is not lower than the hot water supply set temperature (No in S407), the process of the temperature control unit 63 proceeds to step S410.

In step S408, the temperature control unit 63 performs control to reduce the rotation speed of the hot water supply circulation pump 3 so that the detected temperature is reduced to the hot water supply set temperature.
In step S409, the temperature control unit 63 performs control to increase the rotation speed of the hot water supply circulation pump 3 so that the detected temperature increases to the hot water supply set temperature.
In step S410, the temperature control unit 63 maintains the rotational speed of the hot water supply circulation pump 3 as it is.

  And the process of the control apparatus 60 complete | finishes (ends) the "hot-water supply / tub terminal supply control" (S106 shown in FIG. 5) shown in FIG. 8, and returns to step S101 of FIG.

  On the other hand, in step S411, the temperature control unit 63 causes the hot water supply mixing valve 6 and the bathtub mixing valve 7 to be fully open (so that the water side opening is fully closed) so that the hot water supply mixing valve 6 is fully open. And the bathtub mixing valve 7 is controlled. Thereafter, the processing of the temperature control unit 63 proceeds to step S405 described above.

On the other hand, in step S412, the temperature control unit 63 controls the bathtub mixing valve 7 so that the hot water side opening of the bathtub mixing valve 7 is fully opened (so that the water side opening is fully closed).
In step S <b> 413, the temperature control unit 63 performs “hot water mixing valve temperature control” for controlling the temperature of hot water supplied to the hot water supply terminal 71. The “hot water mixing valve temperature control” will be described later with reference to FIG.

In step S <b> 414, the temperature control unit 63 detects the temperature of the hot water flowing out from the secondary side outlet of the hot water supply heat exchanger 2 by the secondary side outlet temperature sensor 53.
In step S415, the temperature control unit 63 determines whether or not the detected temperature of the secondary side outlet temperature sensor 53 detected in step S414 is higher than the bathtub set temperature. When the detected temperature is higher than the bathtub set temperature (S415 / Yes), the process of the temperature control unit 63 proceeds to step S417. On the other hand, when the detected temperature is not higher than the bathtub set temperature (No in S415), the process of the temperature control unit 63 proceeds to Step S416.
In step S416, the temperature control unit 63 determines whether or not the detected temperature is lower than the bathtub set temperature. When the detected temperature is lower than the bathtub set temperature (S416 / Yes), the process of the temperature control unit 63 proceeds to step S418. On the other hand, when the detected temperature is not lower than the bathtub set temperature (No in S416), the process of the temperature control unit 63 proceeds to Step S419.

In step S417, the temperature control unit 63 performs control to reduce the rotation speed of the hot water supply circulation pump 3 so that the detected temperature is lowered to the bathtub set temperature.
In step S418, the temperature control unit 63 performs control to increase the rotation speed of the hot water supply circulation pump 3 so that the detected temperature rises to the bathtub set temperature.
In step S419, the temperature control unit 63 maintains the rotational speed of the hot water supply circulation pump 3 as it is.

  And the process of the control apparatus 60 complete | finishes (ends) the "hot-water supply / tub terminal supply control" (S106 shown in FIG. 5) shown in FIG. 8, and returns to step S101 of FIG.

<Tab mixing valve temperature control>
The “tub mixing valve temperature control” shown in step S404 of FIG. 8 will be described with reference to FIG.
In step S <b> 501, the temperature control unit 63 detects the temperature of hot water flowing out from the outlet side of the bathtub mixing valve 7 using the bathtub temperature sensor 55.
In step S502, the temperature control unit 63 determines whether or not the detected temperature of the bathtub temperature sensor 55 detected in step S501 is higher than the bathtub set temperature. When the detected temperature is higher than the bathtub set temperature (S502 / Yes), the process of the temperature control unit 63 proceeds to step S504. On the other hand, when the detected temperature is not higher than the bathtub set temperature (No in S502), the process of the temperature control unit 63 proceeds to Step S503.
In step S503, the temperature control unit 63 determines whether or not the detected temperature is lower than the bathtub set temperature. When the detected temperature is lower than the bathtub set temperature (S503 / Yes), the process of the temperature control unit 63 proceeds to step S505. On the other hand, when the detected temperature is not lower than the bathtub set temperature (No in S503), the process of the temperature control unit 63 proceeds to Step S506.

In step S504, the temperature control unit 63 performs control to decrease the hot water side opening of the bathtub mixing valve 7 so that the detected temperature decreases to the bathtub set temperature.
In step S505, the temperature control unit 63 performs control to increase the hot water side opening of the bathtub mixing valve 7 so that the detected temperature rises to the bathtub set temperature.
In step S506, the temperature control unit 63 maintains the hot water side opening of the bathtub mixing valve 7 as it is.

  And the process of the temperature control part 63 complete | finishes (ends) the "tub mixing valve temperature control" (S404 shown in FIG. 8) shown in FIG. 9, and progresses to step S405 of FIG.

<Hot water mixing valve temperature control>
The “hot water mixing valve temperature control” shown in step S413 of FIG. 8 will be described with reference to FIG.
In step S <b> 601, the temperature control unit 63 detects the temperature of the hot water flowing out from the outlet side of the hot water supply mixing valve 6 by the hot water supply temperature sensor 54.
In step S602, temperature control unit 63 determines whether or not the detected temperature of hot water supply temperature sensor 54 detected in step S601 is higher than the hot water supply set temperature. When the detected temperature is higher than the hot water supply set temperature (S602 / Yes), the process of the temperature control unit 63 proceeds to step S604. On the other hand, when the detected temperature is not higher than the hot water supply set temperature (No in S602), the process of the temperature control unit 63 proceeds to Step S603.
In step S603, the temperature control unit 63 determines whether or not the detected temperature is lower than the hot water supply set temperature. When the detected temperature is lower than the hot water supply set temperature (S603 / Yes), the process of the temperature control unit 63 proceeds to step S605. On the other hand, when the detected temperature is not lower than the hot water supply set temperature (No in S603), the process of the temperature control unit 63 proceeds to Step S606.

In step S604, the temperature control unit 63 performs control to reduce the hot water side opening of the hot water supply mixing valve 6 so that the detected temperature is lowered to the hot water supply set temperature.
In step S605, the temperature control unit 63 performs control to increase the hot water side opening of the hot water supply mixing valve 6 so that the detected temperature rises to the hot water supply set temperature.
In step S606, the temperature control unit 63 maintains the hot water side opening of the hot water supply mixing valve 6 as it is.

  And the process of the temperature control part 63 complete | finishes (ends) the "hot-water supply mixing valve temperature control" (S413 shown in FIG. 8) shown in FIG. 10, and progresses to step S414 of FIG.

(Action / Effect)
The operation and effect of the water heater S according to the first embodiment will be described.
When hot water is supplied only to the hot water supply terminal 71 (S104), the water heater S fully opens the hot water side opening of the hot water mixing valve 6 (S201), and the secondary outlet temperature of the hot water heat exchanger 2 is the hot water set temperature. The rotational speed of the hot water supply circulation pump 3 is controlled so as to become (S203 to S207). Thereby, the hot water heated to the hot water supply set temperature and discharged from the secondary side outlet of the hot water supply heat exchanger 2 can be supplied to the hot water supply terminal 71 while maintaining the pressure of the tap water.

  When hot water is supplied only to the bathtub terminal 72 (S105), the water heater S fully opens the hot water side opening of the bathtub mixing valve 7 (S301), and the secondary outlet temperature of the hot water supply heat exchanger 2 is the bath set temperature. The rotational speed of the hot water supply circulation pump 3 is controlled so as to become (S303 to S307). Thereby, the hot water heated to the bathtub set temperature and discharged from the secondary side outlet of the hot water supply heat exchanger 2 can be supplied to the bathtub terminal 72 while maintaining the pressure of the tap water.

Furthermore, when hot water is simultaneously supplied to the hot water supply terminal 71 and the bathtub terminal 72 (S106), the hot water heater S compares the hot water supply set temperature with the bathtub set temperature (S401, S402), and a terminal (hot water supply terminal) having a high set temperature. 71 / tub terminal 72), the hot water side opening of the mixing valve (hot water mixing valve 6 / tub mixing valve 7) is fully opened (S403 / S412), and the secondary outlet temperature of the hot water heat exchanger 2 is set to hot water. The rotational speed of the hot water supply circulation pump 3 is controlled so as to be the higher set temperature of the temperature and the bath set temperature (S406 to S410 / S415 to S419). Thereby, the hot water heated to the higher preset temperature and discharged from the secondary side outlet of the hot water supply heat exchanger 2 can be supplied to a terminal having a higher preset temperature while maintaining the tap water pressure.
Moreover, the water heater S controls the opening degree of the mixing valve (the bathtub mixing valve 7 / the hot water mixing valve 6) corresponding to the terminal having the low set temperature (the bathtub terminal 72 / the hot water supply terminal 71) and controls the mixing with the tap water. (S404 / S413). Thereby, in the state which maintained the pressure of the tap water, the hot water of the lower set temperature which mixed the hot water and the tap water which were heated by the higher preset temperature and was discharged from the secondary side exit of the hot water supply heat exchanger 2 was mixed. , Can be supplied to a terminal having a low set temperature.

  As described above, the water heater S according to the first embodiment can supply hot water to the hot water supply terminal and the bathtub terminal at the same time while maintaining the pressure of the tap water, and is different between the hot water supply terminal and the bathtub terminal. Temperature hot water can be supplied.

<< Modification of First Embodiment >>
Next, temperature control executed by the controller 60 of the water heater S according to the modification of the first embodiment will be described with reference to FIGS. 11 and 12. Note that description of points that are common to the first embodiment is omitted. FIG. 11 is a flowchart showing hot water supply temperature control when the hot water heater S according to the modification supplies hot water to the bathtub terminal.
The difference between the first embodiment and the modification is that “hot water mixing valve opening control” (step S701) for adjusting the opening of the hot water mixing valve after step S302 of “hot water supply terminal supply control” shown in FIG. It differs in that it has been added.

The “hot water mixing valve opening degree control” shown in step S701 of FIG. 11 will be described with reference to FIG. FIG. 12 is a flowchart showing hot water mixing valve opening control of the hot water heater S according to the modification.
In step S801, the temperature control unit 63 determines whether or not the hot water supply set temperature is equal to or higher than the bathtub set temperature. When the hot water supply set temperature is equal to or higher than the bathtub set temperature (S801 / Yes), the process of the temperature control unit 63 proceeds to step S802. On the other hand, when the hot water supply set temperature is not equal to or higher than the bath set temperature (No in S801), the process of the temperature control unit 63 proceeds to Step S803.

  In step S802, the temperature control unit 63 controls the hot water supply mixing valve 6 so that the hot water side opening of the hot water supply mixing valve 6 is fully opened (so that the water side opening is fully closed).

On the other hand, in step S <b> 803, the temperature control unit 63 detects the temperature of normal temperature water (unheated tap water) supplied to the water side of the hot water supply mixing valve 6 with the water supply temperature sensor 52.
In step S804, the temperature control unit 63 detects the detected temperature of the water supply temperature sensor 52 detected in step S803, the detected temperature of the secondary outlet temperature sensor 53 detected in step S302 (see FIG. 11), and the setting storage unit 62. On the basis of the hot water supply set temperature stored in the hot water supply terminal 71, the hot water of the hot water supply mixing valve 6 is directed from the outlet side of the hot water supply mixing valve 6 to the hot water supply terminal 71 when the use of the hot water supply terminal 71 is started. Pre-adjust the side opening.

  And the process of the temperature control part 63 complete | finishes (ends) "hot-water supply mixing valve opening degree control" (S701 shown in FIG. 11) shown in FIG. 12, and progresses to step S303 of FIG.

  Thus, when the hot water supply set temperature is equal to or higher than the bath set temperature (S801 / Yes), the hot water supply mixing valve 6 is fully opened in advance (S802). Thus, when the use of only the bathtub terminal 72 is shifted to the simultaneous use of the hot water supply terminal 71 and the bathtub terminal 72, the time required to fully open the hot water side opening of the hot water mixing valve 6 (see S403 and S411 in FIG. 8) is omitted. Therefore, the time until the temperature of the hot water supplied from the hot water supply terminal 71 is set to the hot water supply set temperature can be shortened. In addition, even if the hot water side opening degree of the hot water supply mixing valve 6 is fully opened in advance, since hot water at the bath set temperature is supplied immediately after the start of hot water supply, hot water having a temperature higher than the hot water set temperature can be prevented from being supplied. .

  When the hot water supply set temperature is lower than the bath set temperature (S801, No), the opening degree (mixing ratio) of the hot water supply mixing valve 6 is adjusted in advance (S804). Thereby, when shifting from the use of only the bathtub terminal 72 to the simultaneous use of the hot water supply terminal 71 and the bathtub terminal 72, the time for controlling the opening degree (mixing ratio) of the hot water supply mixing valve 6 can be shortened. The time until the temperature of the hot water to be set to the hot water supply set temperature can be shortened. In addition, by adjusting the opening degree (mixing ratio) of the hot water supply mixing valve 6 in advance, it is possible to prevent hot water having a temperature higher than the hot water supply set temperature (for example, the bath set temperature) from being supplied immediately after the start of hot water supply. it can.

  11 and 12, the hot water supply terminal has been described as adjusting the opening (mixing ratio) of the hot water supply mixing valve 6 on the hot water supply terminal 71 side while supplying hot water to the bathtub terminal 72. You may adjust the opening degree (mixing ratio) of the bathtub mixing valve 7 by the side of the bathtub terminal 72 which is not used during supplying hot water to 71. The adjustment method is the same as in the case of the hot water supply mixing valve 6, and the description is omitted.

  Moreover, the hot water side opening degree of the hot water supply mixing valve 6 and the bathtub mixing valve 7 may be fully opened in advance in a state where neither the hot water supply terminal 71 nor the bathtub terminal 72 is used. At the time of starting use of one terminal, since the hot water side opening is controlled to be fully opened (see S201 and S301), the time for controlling the hot water side opening of the mixing valve can be shortened.

<< Second Embodiment >>
Next, temperature control executed by the control device 60 of the water heater S according to the second embodiment will be described with reference to FIGS. Note that description of points that are common to the first embodiment is omitted.
The control device 60 of the water heater S according to the second embodiment is different from the first embodiment in that it further includes a failure determination unit 66 (see FIG. 2) that determines a failure of the hot water mixing valve 6 and the bathtub mixing valve 7. Moreover, as shown in FIG. 13, control of the bathtub solenoid valve 8 which the bathtub solenoid valve control part 64 performs differs from 1st Embodiment (refer FIG. 3). In addition, as shown in FIG. 14 to FIG. 21, the temperature control of the hot water supplied to the hot water supply terminal 71 and the bathtub terminal 72 when it is determined that the mixing valve (the hot water supply mixing valve 6, the bathtub mixing valve 7) has failed is the first. Added from one embodiment.

<Bathtub solenoid valve control>
The control of the bathtub solenoid valve 8 performed by the bathtub solenoid valve control unit 64 of the control device 60 will be described. FIG. 13 is a flowchart showing bathtub solenoid valve control according to the second embodiment.
In 2nd Embodiment, when the determination result of step S11 is Yes, the process of the bathtub solenoid valve control part 64 progresses to step S12.
In step S <b> 12, the bathtub solenoid valve control unit 64 of the control device 60 determines whether or not the “hot water supply priority request” is stored in the setting storage unit 62. When the “hot water supply priority request” is stored (S12 / Yes), the processing of the bathtub solenoid valve control unit 64 proceeds to step S14. On the other hand, when the “hot water supply priority request” is not stored (S12, No), the processing of the bathtub solenoid valve control unit 64 proceeds to step S13.

<Mixed valve failure judgment>
The mixing valve failure determination executed by the failure determination unit 66 of the control device 60 will be described. FIG. 14 is a flowchart showing the mixing valve failure determination of the water heater S according to the second embodiment. Note that the mixing valve failure determination shown in FIG. 14 is executed, for example, when the water heater S is activated.
In step S901, the failure determination unit 66 of the control device 60 determines whether or not the hot water supply mixing valve 6 has failed. When the hot water supply mixing valve 6 is out of order (S901 / Yes), the process of the control device 60 proceeds to step S902. On the other hand, when the hot water supply mixing valve 6 has not failed (S901, No), the process of the control device 60 proceeds to step S903.
In step S902, the failure determination unit 66 determines whether or not the bathtub mixing valve 7 has failed. When the bathtub mixing valve 7 is out of order (S902 / Yes), the process of the control device 60 proceeds to step S904. On the other hand, when the bathtub mixing valve 7 has not failed (S902, No), the process of the control device 60 proceeds to step S905.
In step S903, the failure determination unit 66 determines whether or not the bathtub mixing valve 7 has failed. When the bathtub mixing valve 7 has failed (S903 * Yes), the process of the control apparatus 60 progresses to step S906. On the other hand, when the bathtub mixing valve 7 has not failed (No in S903), the process of the control device 60 proceeds to Step S907.

In step S904, the control device 60 performs “hot water supply terminal priority control”. The “hot water supply terminal priority control” will be described later with reference to FIG.
In step S905, the control device 60 performs “hot water supply mixing valve failure control”. The “hot water mixing valve failure control” will be described later with reference to FIGS. 15 to 17.
In step S <b> 906, the control device 60 performs “bathtub mixing valve failure control”. The “tub mixing valve failure control” will be described later with reference to FIGS.
In step S907, the control device 60 performs “normal control”. The “normal control” is the same as the control in the first embodiment (see FIGS. 5 to 10), and the description is omitted.

<Control when hot water mixing valve fails>
The “hot water mixing valve failure control” shown in step S905 of FIG. 14 will be described with reference to FIG. FIG. 15 is a flowchart showing the hot water mixing valve failure time control of the water heater S according to the second embodiment.
In step S1001, the hot water supply target determination unit 61 of the control device 60 determines whether or not the hot water supply flow rate sensor 57 has detected the flow rate. When the hot water supply flow rate is detected (S1001, Yes), the process of the control device 60 proceeds to step S1002. On the other hand, when the hot water supply flow rate is not detected (No in S1001), the process of the control device 60 proceeds to Step S1003.
In step S1002, the hot water supply target determination unit 61 determines whether or not the bathtub flow rate sensor 58 has detected a flow rate. When the bathtub flow rate is detected (S1002, Yes), the process of the control device 60 proceeds to step S1007. On the other hand, when the bathtub flow rate is not detected (No in S1002), the process of the control device 60 proceeds to Step S1005.

In step S <b> 1003, control device 60 deletes (resets) “hot water supply priority request” if “hot water supply priority request” is registered in setting storage unit 62.
In step S1004, the hot water supply target determination unit 61 determines whether or not the bathtub flow rate sensor 58 has detected a flow rate. When the bathtub flow rate is detected (S1004 / Yes), the process of the control device 60 proceeds to step S1006. On the other hand, when the bathtub flow rate is not detected (No in S1004), the process of the control device 60 returns to Step S1001.

In step S1005, control device 60 performs “hot water supply terminal supply control (hot water supply side failure)” for controlling the temperature of hot water supplied to hot water supply terminal 71 when hot water supply mixing valve 6 fails. “Hot water supply terminal supply control (hot water supply side failure)” will be described later with reference to FIG. Thereafter, the process of the control device 60 returns to step S1001.
In step S <b> 1006, the control device 60 performs “tub terminal supply control” for controlling the temperature of hot water supplied to the bathtub terminal 72. Note that “tub terminal supply control” is the same as the control shown in step S105 of FIG. 5 and FIG. 7 of the first embodiment, and a description thereof will be omitted. Thereafter, the process of the control device 60 returns to step S1001.
In step S <b> 1007, control device 60 performs “hot water / tub terminal supply control (hot water supply side failure)” for controlling the temperature of hot water supplied to hot water supply terminal 71 and bathtub terminal 72 when hot water supply mixing valve 6 fails. The “hot water supply / tub terminal supply control (hot water supply side failure)” will be described later with reference to FIG. Thereafter, the process of the control device 60 returns to step S1001.

<Hot water supply terminal supply control when hot water mixing valve fails>
“Hot water supply terminal supply control (hot water supply side failure)” shown in step S1005 of FIG. 15 will be described with reference to FIG. FIG. 16: is a flowchart which shows the hot water supply terminal supply control at the time of the hot water supply mixing valve failure of the water heater based on 2nd Embodiment.
In step S <b> 1101, the temperature control unit 63 detects the temperature of the hot water flowing out from the outlet side of the hot water supply mixing valve 6 by the hot water supply temperature sensor 54.
In step S1102, temperature controller 63 determines whether or not the detected temperature of hot water supply temperature sensor 54 detected in step S1101 is higher than the hot water supply set temperature. If the detected temperature is higher than the hot water supply set temperature (Yes in S1102), the process of the temperature control unit 63 proceeds to step S1104. On the other hand, when the detected temperature is not higher than the hot water supply set temperature (No in S1102), the process of the temperature control unit 63 proceeds to Step S1103.
In step S1103, temperature control unit 63 determines whether or not the detected temperature is lower than the hot water supply set temperature. If the detected temperature is lower than the hot water supply set temperature (Yes in S1103), the process of the temperature control unit 63 proceeds to step S1105. On the other hand, when the detected temperature is not lower than the hot water supply set temperature (No in S1103), the process of the temperature control unit 63 proceeds to step S1106.

In step S1104, the temperature control unit 63 performs control to reduce the rotation speed of the hot water supply circulation pump 3 so that the detected temperature is reduced to the hot water supply set temperature.
In step S1105, the temperature control unit 63 performs control to increase the rotation speed of the hot water supply circulation pump 3 so that the detected temperature increases to the hot water supply set temperature.
In step S1106, the temperature control unit 63 maintains the rotational speed of the hot water supply circulation pump 3 as it is.

  And the process of the control apparatus 60 complete | finishes (end) the "hot-water supply terminal supply control (hot-water supply side failure)" (S1005 shown in FIG. 15) shown in FIG. 16, and returns to step S1001 of FIG.

  As described above, when hot water is supplied only to the hot water supply terminal 71 in a state where the hot water supply mixing valve 6 is out of order (S1005), the hot water heater S is set so that the temperature detected by the hot water supply temperature sensor 54 becomes the hot water supply set temperature. The rotational speed of the hot water supply circulation pump 3 is controlled (S1102 to S1106). Thereby, the hot water heated to the hot water supply preset temperature can be supplied to the hot water supply terminal 71 in a state where the pressure of the tap water is maintained.

<Hot water supply / tub terminal supply control in case of hot water mixing valve failure>
“Hot water supply / tub terminal supply control (hot water supply side failure)” shown in step S1007 of FIG. 15 will be described with reference to FIG. FIG. 17 is a flowchart showing hot water / tub terminal supply control when a hot water mixing valve of the water heater according to the second embodiment fails.
In step S1201, temperature control unit 63 determines whether or not the hot water supply set temperature is equal to or higher than the bath set temperature. When the hot water supply set temperature is equal to or higher than the bath set temperature (S1201 Yes), the process of the temperature control unit 63 proceeds to step S1202. On the other hand, when the hot water supply set temperature is not equal to or higher than the bath set temperature (S1201 No), the process of the temperature control unit 63 proceeds to step S1209.

  In step S <b> 1202, the temperature control unit 63 performs “tub mixing valve temperature control” for controlling the temperature of hot water supplied to the bathtub terminal 72. The “tub mixing valve temperature control” is the same as the control shown in step S404 of FIG. 8 and FIG. 9 of the first embodiment, and a description thereof will be omitted. Thereafter, the process of the temperature control unit 63 proceeds to step S1203.

  In step S <b> 1203, the temperature control unit 63 detects the temperature of the hot water flowing out from the outlet side of the hot water mixing valve 6 using the hot water temperature sensor 54.

In step S1204, temperature control unit 63 determines whether or not the detected temperature of hot water supply temperature sensor 54 detected in step S1203 is higher than the hot water supply set temperature. When the detected temperature is higher than the hot water supply set temperature (S1204, Yes), the process of the temperature control unit 63 proceeds to step S1206. On the other hand, when the detected temperature is not higher than the hot water supply set temperature (No in S1204), the process of the temperature control unit 63 proceeds to Step S1205.
In step S1205, temperature control unit 63 determines whether or not the detected temperature is lower than the hot water supply set temperature. When the detected temperature is lower than the hot water supply set temperature (S1205 / Yes), the process of the temperature control unit 63 proceeds to step S1207. On the other hand, when the detected temperature is not lower than the hot water supply set temperature (No in S1205), the process of the temperature control unit 63 proceeds to step S1208.

In step S1206, the temperature control unit 63 performs control to reduce the rotation speed of the hot water supply circulation pump 3 so that the detected temperature is reduced to the hot water supply set temperature.
In step S1207, the temperature control unit 63 performs control to increase the rotation speed of the hot water supply circulation pump 3 so that the detected temperature increases to the hot water supply set temperature.
In step S1208, the temperature control unit 63 maintains the rotational speed of the hot water supply circulation pump 3 as it is.

  And the process of the control apparatus 60 complete | finishes the "hot-water supply / bath-tub terminal supply control (hot-water supply side failure)" shown in FIG. 17 (S1007 shown in FIG. 15), and returns to step S1001 of FIG.

  On the other hand, in step S 1209, the temperature control unit 63 registers “hot water supply priority request” in the setting storage unit 62. Thereafter, the processing of the temperature control unit 63 proceeds to step S1203 described above.

As described above, when hot water is supplied to the hot water supply terminal 71 and the bathtub terminal 72 in a state where the hot water supply mixing valve 6 is out of order (S1007), the temperature detected by the hot water supply temperature sensor 54 is the hot water supply S. The rotational speed of the hot water supply circulation pump 3 is controlled so as to become (S1204 to S1208). Thereby, the hot water heated to the hot water supply preset temperature can be supplied to the hot water supply terminal 71 in a state where the pressure of the tap water is maintained.
When the hot water supply set temperature is equal to or higher than the bath set temperature (S1201 Yes), the opening of the bath mixing valve 7 is controlled so that the hot water at the bath set temperature is maintained at the pressure of the tap water 72 (S1202).

When the hot water supply set temperature is not equal to or higher than the bath set temperature (S1201, No), by registering “hot water supply priority request” in the setting storage unit 62 (S1209), the bathtub electromagnetic valve control unit 64 closes the bathtub electromagnetic valve 8. Then, the supply of hot water to the bathtub terminal 72 is temporarily stopped (S12 · Yes → S14 in FIG. 13). As a result, the bath flow rate becomes 0 (S1002 / No in FIG. 15), so that the temperature control of the water heater S starts from “Hot water / tub terminal supply control (hot water supply side failure)” (S1007). It is possible to supply hot water heated to the hot water supply set temperature to the hot water supply terminal 71 while maintaining the pressure of the tap water.
Thereafter, when the supply of hot water to the hot water supply terminal 71 is completed (S1001 in FIG. 15), the “hot water supply priority request” is deleted (S1003), and when there is a “hot water filling request”, the bathtub solenoid valve 8 is opened. (S12 · No → S13 in FIG. 13). Thereby, the bathtub flow rate is detected (S1004 / Yes), the control of the “tub terminal supply control” (S1006) is executed, and the hot water of the bathtub set temperature is supplied to the bathtub terminal 72 while maintaining the pressure of the tap water. be able to.

<Control at bathtub mixing valve failure>
The “tub mixing valve failure control” shown in step S906 in FIG. 14 will be described with reference to FIG. FIG. 18 is a flowchart showing control at the time of failure of the bathtub mixing valve of the water heater according to the second embodiment.
In step S1301, the hot water supply target determination unit 61 of the control device 60 determines whether or not the hot water supply flow rate sensor 57 has detected a flow rate. When the hot water supply flow rate is detected (S1301, Yes), the process of the control device 60 proceeds to step S1302. On the other hand, when the hot water supply flow rate is not detected (No in S1301), the process of the control device 60 proceeds to Step S1303.
In step S1302, the hot water supply target determination unit 61 determines whether the bathtub flow rate sensor 58 has detected a flow rate. When the bathtub flow rate is detected (S1302, Yes), the process of the control device 60 proceeds to step S1307. On the other hand, when the bathtub flow rate is not detected (No in S1302), the process of the control device 60 proceeds to Step S1305.

In step S1303, if “hot water supply priority request” is registered in setting storage unit 62, control device 60 deletes (resets) “hot water supply priority request”.
In step S1304, the hot water supply target determination unit 61 determines whether or not the bathtub flow rate sensor 58 has detected a flow rate. When the bathtub flow rate is detected (S1304, Yes), the process of the control device 60 proceeds to step S1306. On the other hand, when the bathtub flow rate is not detected (No in S1304), the process of the control device 60 returns to Step S1301.

In step S 1305, control device 60 performs “hot water supply terminal supply control” for controlling the temperature of hot water supplied to hot water supply terminal 71. Note that “hot water supply terminal supply control” is the same as the control shown in step S104 of FIG. 5 and FIG. 6 of the first embodiment, and a description thereof will be omitted. Thereafter, the processing of the control device 60 returns to step S1301.
In step S1306, the control device 60 performs “tub terminal supply control (tub side failure)” for controlling the temperature of hot water supplied to the bathtub terminal 72 when the bathtub mixing valve 7 fails. The “tub terminal supply control (bathtub side failure)” will be described later with reference to FIG. Thereafter, the processing of the control device 60 returns to step S1301.
In step S1307, control device 60 performs “hot water supply / tub terminal supply control (tub side failure)” for controlling the temperature of hot water supplied to hot water supply terminal 71 and bathtub terminal 72 when bathtub mixing valve 7 fails (step S1307). “Hot water supply / tub terminal supply control (tub side failure)” will be described later with reference to FIG. Thereafter, the processing of the control device 60 returns to step S1301.

<Tub terminal supply control when bathtub mixing valve fails>
The “tub terminal supply control (tub side failure)” shown in step S1306 in FIG. 18 will be described with reference to FIG. FIG. 19: is a flowchart which shows the bathtub terminal supply control at the time of the bathtub mixing valve failure of the water heater based on 2nd Embodiment.
In step S <b> 1401, the temperature control unit 63 detects the temperature of the hot water flowing out from the outlet side of the bathtub mixing valve 7 using the bathtub temperature sensor 55.

In step S1402, the temperature control unit 63 determines whether or not the detected temperature of the bathtub temperature sensor 55 detected in step S1401 is higher than the bathtub set temperature. When the detected temperature is higher than the bathtub set temperature (S1402 / Yes), the process of the temperature control unit 63 proceeds to step S1404. On the other hand, when the detected temperature is not higher than the bathtub set temperature (No at S1402), the process of the temperature control unit 63 proceeds to Step S1403.
In step S1403, the temperature control unit 63 determines whether or not the detected temperature is lower than the bathtub set temperature. When the detected temperature is lower than the bathtub set temperature (S1403, Yes), the process of the temperature control unit 63 proceeds to step S1405. On the other hand, when the detected temperature is not lower than the bathtub set temperature (S1403, No), the process of the temperature control unit 63 proceeds to step S1406.

In step S1404, the temperature control unit 63 performs control to reduce the rotation speed of the hot water supply circulation pump 3 so that the detected temperature is lowered to the bath set temperature.
In step S1405, the temperature control unit 63 performs control to increase the rotation speed of the hot water supply circulation pump 3 so that the detected temperature increases to the bathtub set temperature.
In step S1406, the temperature control unit 63 maintains the rotational speed of the hot water supply circulation pump 3 as it is.

  And the process of the control apparatus 60 complete | finishes (ends) "tub terminal supply control (tub side failure)" (S1306 shown in FIG. 18) shown in FIG. 19, and returns to step S1301 of FIG.

  Thus, when supplying hot water only to the bathtub terminal 72 in a state where the bathtub mixing valve 7 is out of order (S1306), the water heater S is set so that the temperature detected by the bathtub temperature sensor 55 becomes the bathtub set temperature. The rotational speed of the hot water supply circulation pump 3 is controlled (S1402 to S1406). Thereby, the hot water heated to bathtub setting temperature can be supplied to the bathtub terminal 72 in the state which maintained the pressure of tap water.

<Hot-water supply / tub terminal supply control when bathtub mixing valve fails>
"Hot water supply / tub terminal supply control (tub side failure)" shown in step S1307 of FIG. 18 will be described with reference to FIG. FIG. 20 is a flowchart illustrating hot water / tub terminal supply control when a bathtub mixing valve of the water heater according to the second embodiment fails.
In step S1501, temperature control unit 63 determines whether or not the hot water supply set temperature is higher than the bathtub set temperature. When the hot water supply set temperature is higher than the bathtub set temperature (S1501 / Yes), the process of the temperature control unit 63 proceeds to step S1502. On the other hand, when the hot water supply set temperature is not higher than the bath set temperature (S1501 · No), the process of the temperature control unit 63 proceeds to step S1510.

In step S1502, the temperature control unit 63 controls the hot water supply mixing valve 6 so that the hot water side opening degree of the hot water supply mixing valve 6 is fully opened (so that the water side opening degree is fully closed).
In step S <b> 1503, the temperature control unit 63 registers “hot water supply priority request” in the setting storage unit 62.
In step S <b> 1504, the temperature control unit 63 detects the temperature of the hot water flowing out from the secondary side outlet of the hot water supply heat exchanger 2 by the secondary side outlet temperature sensor 53.

In step S1505, the temperature control unit 63 determines whether or not the detected temperature of the secondary side outlet temperature sensor 53 detected in step S1504 is higher than the hot water supply set temperature. When the detected temperature is higher than the hot water supply set temperature (S1505, Yes), the process of the temperature control unit 63 proceeds to step S1507. On the other hand, when the detected temperature is not higher than the hot water supply set temperature (No in S1505), the process of the temperature control unit 63 proceeds to Step S1506.
In step S1506, temperature control unit 63 determines whether or not the detected temperature is lower than the hot water supply set temperature. When the detected temperature is lower than the hot water supply set temperature (S1506, Yes), the process of the temperature control unit 63 proceeds to step S1508. On the other hand, when the detected temperature is not lower than the hot water supply set temperature (No in S1506), the process of the temperature control unit 63 proceeds to Step S1509.

In step S1507, the temperature control unit 63 performs control to reduce the rotation speed of the hot water supply circulation pump 3 so that the detected temperature is reduced to the hot water supply set temperature.
In step S1508, the temperature control unit 63 performs control to increase the rotation speed of the hot water supply circulation pump 3 so that the detected temperature increases to the hot water supply set temperature.
In step S1509, the temperature control unit 63 maintains the rotational speed of the hot water supply circulation pump 3 as it is.

  And the process of the control apparatus 60 complete | finishes (end) the "hot-water-supply / tub terminal supply control (at the time of bathtub side failure)" shown in FIG. 20 (S1307 shown in FIG. 18), and returns to step S1301 of FIG.

  On the other hand, in step S1510, the temperature control unit 63 performs “hot water mixing valve temperature control” for controlling the temperature of hot water supplied to the hot water supply terminal 71. Note that “hot water mixing valve temperature control” is the same as the control shown in step S413 of FIG. 8 and FIG. 10 of the first embodiment, and a description thereof will be omitted. Thereafter, the processing of the temperature control unit 63 proceeds to step S1511.

  In step S <b> 1511, the temperature control unit 63 detects the temperature of hot water flowing out from the outlet side of the bathtub mixing valve 7 using the bathtub temperature sensor 55.

In step S1512, the temperature control unit 63 determines whether or not the detected temperature of the bathtub temperature sensor 55 detected in step S1511 is higher than the bathtub set temperature. When the detected temperature is higher than the bathtub set temperature (S1512 / Yes), the process of the temperature control unit 63 proceeds to step S1514. On the other hand, when the detected temperature is not higher than the bathtub set temperature (No in S1512), the process of the temperature control unit 63 proceeds to Step S1513.
In step S1513, the temperature control unit 63 determines whether or not the detected temperature is lower than the bathtub set temperature. When the detected temperature is lower than the bathtub set temperature (S1513 / Yes), the process of the temperature control unit 63 proceeds to step S1515. On the other hand, when the detected temperature is not lower than the bathtub set temperature (S1513, No), the process of the temperature control unit 63 proceeds to step S1516.

In step S1514, the temperature control unit 63 performs control to reduce the rotation speed of the hot water supply circulation pump 3 so that the detected temperature is reduced to the bathtub set temperature.
In step S1515, the temperature control unit 63 performs control to increase the rotation speed of the hot water supply circulation pump 3 so that the detected temperature increases to the bathtub set temperature.
In step S1516, the temperature control unit 63 maintains the rotational speed of the hot water supply circulation pump 3 as it is.

  And the process of the control apparatus 60 complete | finishes (end) the "hot-water-supply / tub terminal supply control (at the time of bathtub side failure)" shown in FIG. 20 (S1307 shown in FIG. 18), and returns to step S1301 of FIG.

  Thus, when supplying hot water to the hot water supply terminal 71 and the bathtub terminal 72 in a state where the bathtub mixing valve 7 is out of order (S1307), when the hot water supply set temperature is equal to or lower than the bathtub set temperature (S1501 No), The machine S controls the rotation speed of the hot water supply circulation pump 3 so that the temperature detected by the bathtub temperature sensor 55 becomes the bathtub set temperature (S1512 to S1516). Thereby, the hot water heated to bathtub setting temperature can be supplied to the bathtub terminal 72 in the state which maintained the pressure of tap water. Further, by controlling the opening degree of the hot water supply mixing valve 6, hot water at a hot water supply set temperature can be supplied to the hot water supply terminal 71 while maintaining the pressure of the tap water (S1510).

  When the hot water supply set temperature is higher than the bath set temperature (S1501 Yes), by registering “hot water supply priority request” in the setting storage unit 62 (S1503), the bath solenoid valve control unit 64 causes the bath solenoid valve 8 to It closes (S12 * Yes-> S14 of FIG. 13), and the supply of the hot water to the bathtub terminal 72 is stopped temporarily. As a result, the bath flow rate becomes zero (S1302 / No in FIG. 18), so that the temperature control of the water heater S starts from “hot water / tub terminal supply control (tub side failure)” (S1307). ”(S1305), the hot water heated to the hot water supply set temperature can be supplied to the hot water supply terminal 71 while maintaining the pressure of the tap water.

  Thereafter, when the supply of hot water to the hot water supply terminal 71 is completed (S1301 in FIG. 18), the “hot water supply priority request” is deleted (S1303), and when there is a “hot water filling request”, the bathtub solenoid valve 8 is opened. (S12 · No → S13 in FIG. 13). Thereby, the bathtub flow rate is detected (S1304 / Yes), the control of “tub terminal supply control (tub side failure)” (S1306) is executed, and the hot water of the bathtub set temperature is maintained in the tap water pressure state. It can be supplied to the terminal 72.

<Hot-water supply terminal priority control (control when hot-water supply mixing valve / tub mixing valve fails)>
“Hot water supply terminal priority control” shown in step S904 in FIG. 14 will be described with reference to FIG. FIG. 21 is a flowchart showing hot water supply terminal priority control of the water heater according to the second embodiment.
In step S1601, the hot water supply target determination unit 61 of the control device 60 determines whether or not the hot water supply flow rate sensor 57 has detected the flow rate. When the hot water supply flow rate is detected (S1601, Yes), the process of the control device 60 proceeds to step S1602. On the other hand, when the hot water supply flow rate is not detected (No in S1601), the process of the control device 60 proceeds to step S1610.
In step S1602, the hot water supply target determination unit 61 determines whether the bathtub flow rate sensor 58 has detected the flow rate. When the bathtub flow rate is detected (Yes in S1602), the process of the control device 60 proceeds to Step S1603. On the other hand, when the bathtub flow rate is not detected (No in S1602), the process of the control device 60 proceeds to Step S1604.

In step S <b> 1603, the temperature control unit 63 registers “hot water supply priority request” in the setting storage unit 62.
In step S <b> 1604, the temperature control unit 63 detects the temperature of the hot water flowing out from the outlet side of the hot water supply mixing valve 6 by the hot water supply temperature sensor 54.

In step S1605, temperature control unit 63 determines whether or not the detected temperature of hot water supply temperature sensor 54 detected in step S1604 is higher than the hot water supply set temperature. When the detected temperature is higher than the hot water supply set temperature (S1605, Yes), the process of the temperature control unit 63 proceeds to step S1607. On the other hand, when the detected temperature is not higher than the hot water supply set temperature (No in S1605), the process of the temperature control unit 63 proceeds to step S1606.
In step S1606, temperature control unit 63 determines whether or not the detected temperature is lower than the hot water supply set temperature. When the detected temperature is lower than the hot water supply set temperature (S1606, Yes), the process of the temperature control unit 63 proceeds to step S1608. On the other hand, when the detected temperature is not lower than the hot water supply set temperature (No in S1606), the process of the temperature control unit 63 proceeds to step S1609.

In step S1607, the temperature control unit 63 performs control to reduce the rotation speed of the hot water supply circulation pump 3 so that the detected temperature is reduced to the hot water supply set temperature. Thereafter, the process of the control device 60 returns to step S1601.
In step S1608, the temperature control unit 63 performs control to increase the rotation speed of the hot water supply circulation pump 3 so that the detected temperature increases to the hot water supply set temperature. Thereafter, the process of the control device 60 returns to step S1601.
In step S1609, the temperature control unit 63 maintains the rotational speed of the hot water supply circulation pump 3 as it is. Thereafter, the process of the control device 60 returns to step S1601.

On the other hand, in step S1610, if “hot water supply priority request” is registered in setting storage unit 62, control device 60 deletes (resets) “hot water supply priority request”.
In step S1611, the hot water supply target determination unit 61 determines whether the bathtub flow rate sensor 58 has detected the flow rate. When the bathtub flow rate is detected (S1611 / Yes), the process of the control device 60 proceeds to step S1611. On the other hand, when the bathtub flow rate is not detected (the bathtub flow rate is 0) (S1611 · No), the process of the control device 60 returns to step S1601.

  In step S <b> 1612, the temperature control unit 63 detects the temperature of the hot water flowing out from the outlet side of the bathtub mixing valve 7 using the bathtub temperature sensor 55.

In step S1613, the temperature control unit 63 determines whether or not the detected temperature of the bathtub temperature sensor 55 detected in step S1612 is higher than the bathtub set temperature. When the detected temperature is higher than the bathtub set temperature (S1613 / Yes), the process of the temperature control unit 63 proceeds to step S1615. On the other hand, when the detected temperature is not higher than the bathtub set temperature (No in S1613), the process of the temperature control unit 63 proceeds to step S1614.
In step S1614, the temperature control unit 63 determines whether or not the detected temperature is lower than the bathtub set temperature. When the detected temperature is lower than the bathtub set temperature (S1614 / Yes), the process of the temperature control unit 63 proceeds to step S1616. On the other hand, when the detected temperature is not lower than the bathtub set temperature (No in S1614), the process of the temperature control unit 63 proceeds to step S1617.

In step S <b> 1615, the temperature control unit 63 performs control to reduce the rotation speed of the hot water supply circulation pump 3 so that the detected temperature is lowered to the bathtub set temperature. Thereafter, the process of the control device 60 returns to step S1601.
In step S <b> 1616, the temperature control unit 63 performs control to increase the rotation speed of the hot water supply circulation pump 3 so that the detected temperature rises to the bathtub set temperature. Thereafter, the process of the control device 60 returns to step S1601.
In step S1617, the temperature control unit 63 maintains the rotational speed of the hot water supply circulation pump 3 as it is. Thereafter, the process of the control device 60 returns to step S1601.

  In this way, when hot water is supplied only to the hot water supply terminal 71 in a state where the hot water supply mixing valve 6 and the bathtub mixing valve 7 are out of order (S1601 · Yes → S1602 · No), the hot water supply S is the hot water supply temperature sensor 54. The rotational speed of the hot water supply circulation pump 3 is controlled so that the detected temperature becomes the hot water supply set temperature (S1605 to S1609). Thereby, the hot water heated to the hot water supply preset temperature can be supplied to the hot water supply terminal 71 in a state where the pressure of the tap water is maintained.

  Moreover, when supplying hot water only to the bathtub terminal 72 (S1601 * No, S1611 * Yes), the hot water supply S is the rotational speed of the hot water supply circulation pump 3 so that the temperature detected by the bathtub temperature sensor 55 becomes the bathtub set temperature. Is controlled (S1613 to S1617). Thereby, the hot water heated to bathtub setting temperature can be supplied to the bathtub terminal 72 in the state which maintained the pressure of tap water.

When hot water is supplied to the hot water supply terminal 71 and the bathtub terminal 72 in a state where the hot water supply mixing valve 6 and the bathtub mixing valve 7 are out of order (S1601, Yes → S1602, Yes), a “hot water supply priority request” is set in the setting storage unit 62. (S1603), the bathtub solenoid valve control unit 64 closes the bathtub solenoid valve 8 (S12 · Yes → S14 in FIG. 13), and temporarily stops the supply of hot water to the bathtub terminal 72. Thereby, since the bathtub flow rate becomes 0, the hot water heated to the hot water supply set temperature can be supplied to the hot water supply terminal 71 while maintaining the pressure of the tap water.
Thereafter, when the supply of hot water to the hot water supply terminal 71 is completed (S1601, No), the “hot water supply priority request” is deleted (S1610), and when there is a “hot water filling request”, the bathtub solenoid valve 8 is opened ( S12 · No → S13 in FIG. 13). Thereby, a bathtub flow rate is detected (S1611 * Yes).
And the hot water heated to bathtub setting temperature can be supplied to the bathtub terminal 72 in the state which maintained the pressure of tap water similarly to the case where hot water is supplied only to the bathtub terminal 72.

Note that the water heater S according to this embodiment is not limited to the configuration of the above embodiment, and various modifications can be made without departing from the spirit of the invention.
For example, the hot water storage tank is not limited to a sealed type, and may be an open-air type. As a heat source for heating the hot water (heat medium) in the hot water storage tank, a heater or the like disposed in the hot water storage tank may be used in addition to the heat pump unit.
Further, the rotation speed of the hot water supply circulation pump 3, the hot water supply mixing valve 6, and the bathtub are set so that the detected temperature detected by the various temperature sensors (53, 54, 55) is equal to the set temperature (hot water set temperature / bath set temperature). Although it demonstrated as what controls the opening degree of the mixing valve 7, considering the temperature fall in piping etc. from the temperature detection position to the terminal (71, 72) to which hot water is supplied, it corresponds to the detected temperature and the set temperature. Control may be performed so that the temperature (set temperature in consideration of temperature drop) becomes equal.

Moreover, in the said embodiment, although the water supply was demonstrated to the example as a to-be-heated liquid supply source, it is not limited to this, A well or a hot spring may be used as a water supply source.
Further, in the above embodiment, when the heated liquid is indirectly heated with a high-temperature heat medium and hot water is supplied to the hot water supply terminal and the bathtub terminal, respectively, without using a pressure reducing valve or a cistern tank (for example, water supply) Although it has been described that it can be supplied to the hot water supply terminal while maintaining the supply pressure of the liquid to be heated (such as the pressure of water), the present invention is not limited to this. A mechanism (for example, a pressure reducing valve) for reducing the pressure may be interposed between the terminal and the terminal.

S water heater (liquid supply device)
1 Hot water storage tank 2 Hot water supply heat exchanger (heat exchanger)
3 Hot water circulation pump (pump)
4 Pressure reducing valve 6 Hot water supply mixing valve (first mixing valve)
7 Bathtub mixing valve (second mixing valve)
8 Bath Solenoid Valve 10 Hot Water Storage Tank Unit 30 Heat Pump Unit 40 Operation Unit 41 Kitchen Remote Control Terminal 42 Bath Remote Control Terminal 50 Primary Side Inlet Temperature Sensor 51 Primary Side Outlet Temperature Sensor 52 Water Supply Temperature Sensor 53 Secondary Side Outlet Temperature Sensor 54 Hot Water Supply Temperature Sensor ( First temperature sensor)
55 Bathtub temperature sensor (second temperature sensor)
56 Secondary side outlet flow rate sensor 57 Hot water supply flow rate sensor 58 Bathtub flow rate sensor 59 Water level sensor 60 Control device (control means)
61 Hot water supply target determination unit 62 Setting storage unit 63 Temperature control unit 64 Bathtub solenoid valve control unit 65 Hot water filling completion determination unit 66 Failure determination unit 71 Hot water supply terminal (first terminal)
72 Bathtub terminal (second terminal)

Claims (6)

A heat exchanger that heats the liquid to be heated that circulates on the secondary side with a high-temperature heat medium that circulates on the primary side,
A pump for circulating the heat medium to the primary side of the heat exchanger;
A first mixing valve that mixes the high-temperature heated liquid with a low-temperature heated liquid lower in temperature than the high-temperature heated liquid and supplies the mixed heated liquid to the first terminal;
A second mixing valve that mixes the high-temperature heated liquid and the low-temperature heated liquid and supplies the mixed heated liquid to the second terminal;
A secondary side outlet temperature sensor for detecting a temperature of the high temperature heated liquid generated in the heat exchanger;
A first temperature sensor for detecting a temperature of the heated liquid supplied from the first mixing valve to the first terminal;
A second temperature sensor for detecting the temperature of the heated liquid supplied from the second mixing valve to the second terminal;
Control means for controlling the pump, the first mixing valve and the second mixing valve,
A liquid supply apparatus for supplying a heated liquid heated to a first set temperature to a first terminal and supplying a heated liquid heated to a second set temperature to a second terminal,
The control means includes
When the first set temperature is higher than the second set temperature at the time of simultaneous supply to the first terminal and the second terminal,
Controlling the pump so that the detected temperature of the secondary side outlet temperature sensor becomes a temperature corresponding to the first set temperature,
The opening of the first mixing valve on the high temperature heated liquid side is fully open,
The liquid supply apparatus, wherein the second mixing valve is controlled so that a temperature detected by the second temperature sensor becomes a temperature corresponding to the second set temperature. A heat exchanger that heats a liquid to be heated that circulates on the secondary side with a high-temperature heat medium that circulates on the primary side, and generates a high-temperature heated liquid;
A pump for circulating the heat medium to the primary side of the heat exchanger;
A first mixing valve that mixes the high-temperature heated liquid with a low-temperature heated liquid lower in temperature than the high-temperature heated liquid and supplies the mixed heated liquid to the first terminal;
A second mixing valve that mixes the high-temperature heated liquid and the low-temperature heated liquid and supplies the mixed heated liquid to the second terminal;
A secondary side outlet temperature sensor for detecting a temperature of the high temperature heated liquid generated in the heat exchanger;
A first temperature sensor for detecting a temperature of the heated liquid supplied from the first mixing valve to the first terminal;
A second temperature sensor for detecting the temperature of the heated liquid supplied from the second mixing valve to the second terminal;
Control means for controlling the pump, the first mixing valve and the second mixing valve,
A liquid supply apparatus for supplying a heated liquid heated to a first set temperature to a first terminal and supplying a heated liquid heated to a second set temperature to a second terminal,
The control means includes
When the first set temperature is lower than the second set temperature at the time of simultaneous supply to the first terminal and the second terminal,
Controlling the pump so that the detected temperature of the secondary side outlet temperature sensor becomes a temperature corresponding to the second set temperature,
The opening on the high temperature heated liquid side of the second mixing valve is fully open,
The liquid supply apparatus, wherein the first mixing valve is controlled so that a temperature detected by the first temperature sensor becomes a temperature corresponding to the first set temperature. The control means includes
When the first mixing valve fails during simultaneous supply to the first terminal and the second terminal,
The liquid supply apparatus according to claim 1, wherein the pump is controlled so that a temperature detected by the first temperature sensor becomes a temperature corresponding to the first set temperature. The control means includes
When simultaneously supplying to the first terminal and the second terminal, if the first mixing valve fails and the first set temperature is higher than the second set temperature,
The liquid supply apparatus according to claim 3, wherein the second mixing valve is controlled so that a temperature detected by the second temperature sensor becomes a temperature corresponding to the second set temperature. The control means includes
When the second mixing valve fails during simultaneous supply to the first terminal and the second terminal,
3. The liquid supply apparatus according to claim 1, wherein the pump is controlled so that a temperature detected by the second temperature sensor becomes a temperature corresponding to the second set temperature. 4. The control means includes
When simultaneously supplying to the first terminal and the second terminal, if the second mixing valve fails and the second set temperature is lower than the first set temperature,
The liquid supply apparatus according to claim 5, wherein the first mixing valve is controlled so that a temperature detected by the first temperature sensor becomes a temperature corresponding to the first set temperature.

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