JPH0252185B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is a water heater with a heating operation function, and in addition to high-temperature operation for heating or hot water supply, it also performs low-temperature operation for freezing prevention. The present invention relates to a temperature control device that can automatically switch between high temperature operation and low temperature operation.

<Prior art and its problems> In a water heater that is capable of supplying hot water or heating using high-temperature water in a hot water storage can, the water in the hot water storage can is used to supply hot water or heating. Of course, it is necessary to heat and maintain the water at a high temperature, but on the other hand, in order to prevent the equipment from freezing, it is also necessary to heat and maintain the water in the hot water storage can at a low temperature. The former is a high temperature operation, and the latter is a low temperature operation. Conventionally, switching between high-temperature operation and low-temperature operation of the hot water storage can was carried out by manually changing or switching the temperature control knob. However, such conventional methods have the disadvantage that the operation mode must be changed every time the operation is changed from high temperature operation to low temperature operation or from low temperature operation to high temperature operation.

<Purpose> Therefore, the present invention solves the drawbacks of the above-mentioned prior art, and when the switch is turned on/off by a combination of on/off of the water heater operation switch, heating operation switch on/off, and low temperature operation switch, It is extremely convenient and easy to use, as it sets the priority for high temperature or low temperature operation of the hot water storage can, and eliminates the need to manually turn on and off switches each time the operation mode is changed. The purpose is to provide a temperature control device for water heaters with heating operation function.

<Means for Solving the Problems> The present invention has a hot water supply function that controls high-temperature water from a hot water storage can to a set temperature using an electric mixing valve and then releases hot water. It is equipped with a heating operation function that circulates hot water to a radiator, and also has a high-temperature operation that heats and maintains the hot water in the hot water storage can at a set high temperature for hot water supply and heating, and a high temperature operation that heats and maintains the hot water in the hot water storage can to prevent freezing. A temperature control device for a water heater with a heating operation function that is capable of a low-temperature operation that maintains heating at a low temperature, the switching between the high-temperature operation and the low-temperature operation is performed when the heating operation switch is on. The basic feature is that high temperature operation is performed regardless of whether the operation switch is on or off, and low temperature operation is performed only when the heating operation switch is off and the low temperature operation switch is on.

<Function> Provided that the operation switch of the hot water storage can is on, if the heating operation switch is on, the hot water storage can is operated at a high temperature even if the low temperature operation switch is on. If the heating operation switch is turned off and the low temperature operation switch is turned on, the hot water storage can is switched to low temperature operation. When the low temperature operation switch is off, the hot water storage can is operated at a high temperature regardless of whether the heating operation switch is on or off. for example,
If the user turns on the low-temperature operation switch at the same time when running the heating operation at night in winter, the system will automatically shift to the low-temperature operation when the heating operation switch is turned off. Then, in the morning, when you turn on the heating operation switch, the hot water storage can automatically switches to high temperature operation.
Heating can be started.

<Example> FIG. 1 is an overall configuration diagram showing an example of the present invention, FIG. 2 is a flowchart showing an example of temperature control, and FIG. 3 is an electric circuit diagram of a remote control section and a control section.

Reference numeral 1 denotes a hot water storage can, in which supplied water is heated and stored. A burner 2 heats the hot water storage can 1. Hot water is supplied by adjusting high temperature water from the hot water storage can 1 and low temperature water from the water supply pipe to a predetermined hot water temperature set by an electric mixing valve 3. Heating is performed by circulating high-temperature water, which has undergone heat exchange in the hot water storage can 1, through a circulation path 4 to a radiator 6 at a destination location by a circulation pump 5. 7 is a temperature detector for the hot water storage can 1.

In FIGS. 1 and 3, the remote control unit 8 includes an operation switch 9 for the hot water storage can 1 and its operation confirmation lamp 9a, a combustion confirmation lamp 10a for confirming the combustion state of the burner 2, and a combustion confirmation lamp 10a for confirming the combustion state of the burner 2. temperature control switch 11 for turning up, temperature control switch 12 for turning down to lower the outlet temperature, its temperature control setting circuit 13 and temperature control setting display lamp 14, low temperature operation switch 15 for freezing prevention and its low temperature operation confirmation lamp 15a. , a heating operation switch 16, a heating operation confirmation lamp 16a, and a microcomputer (hereinafter referred to as microcomputer) 17 that determines whether to operate the hot water storage can body 1 at a high temperature or at a low temperature and instructs the control unit 20 side. There is.

The control unit 20 includes a power supply circuit 21 , a heating control circuit 22 that controls the driving of the circulation pump 5 , a combustion control circuit 23 that controls combustion of the burner 2 , a hot water storage can temperature adjustment circuit 24 that adjusts the temperature of the hot water storage can 1 , Hot water storage can body 1
High temperature and low temperature operation for switching between high temperature and low temperature operation.
Low temperature operation switching circuit 25, electric mixing valve 3
It has an electric mixing valve temperature control circuit 26 for adjusting the hot water supply temperature, and an electric mixing valve drive circuit 27 for controlling the on/off operation of the electric mixing valve 3.

The heating operation is started by turning on the heating operation switch 16, and the microcomputer 17 and heating control circuit 22
This is done by driving the circulation pump 5 through the .

The temperature of the hot water inside the hot water storage can body 1 can be adjusted by inputting a temperature setting value into the hot water storage can body temperature adjustment circuit 24 using an adjustment knob (not shown), for example, and comparing it with temperature information from the temperature detector 7. This can be done by turning on and off the combustion of the burner 2 via the burner 23. In reality, the hot water temperature in the hot water storage can body 1 is kept at a constant value of, for example, 80°C during high-temperature operation.
Further, during low-temperature operation, a constant value of, for example, 20° C. can be set in advance, so that the operation can be performed at a constant temperature.

To adjust the hot water temperature, use the hot water temperature control switch 11.
Or by operating the down temperature control switch 12, changing the mixing rate of high temperature water and low temperature water by the electric mixing valve 3 via the electric mixing valve temperature control circuit 26 from the temperature control setting circuit 13. Can be done.

Next, a program for automatically switching between high-temperature operation and low-temperature operation of the hot water storage can 1 provided by the present invention will be explained based on FIGS. 2 and 3.

Now, when the heating operation switch 16 is turned on while the operation switch 9 of the hot water storage can body 1 is turned on,
Regardless of whether the low temperature operation switch 15 is turned on or off, the microcomputer 17 determines that the operation is at a high temperature,
A high-temperature operation command is issued to the high-temperature/low-temperature operation switching circuit 25, and the hot water storage can temperature adjustment circuit 24 and combustion control circuit 23
The combustion on/off of the burner 2 is controlled for high-temperature operation. On the other hand, if the heating operation switch 16 is off and the low temperature operation switch 15 is on, the microcomputer 17 determines the low temperature operation, switches the high temperature/low temperature operation switching circuit 25 to the low temperature operation side, and switches the hot water storage can temperature adjustment circuit 24 to the low temperature operation side. , the combustion of the burner 2 is controlled for low-temperature operation via the combustion control circuit 23. Also, if the microcomputer 17 determines that low-temperature operation is to be performed,
After passing through the high temperature/low temperature operation switching circuit 25, the electric mixing valve 3 is locked in the closed state by the electric mixing valve drive circuit 27. In other words, hot water cannot be supplied when operating at low temperatures. When both the heating operation switch 16 and the low temperature operation switch 15 are off, high temperature operation is performed and hot water can be supplied. In this way, in the temperature control device of the present invention, when both the heating operation switch 16 and the low temperature operation switch 15 are on,
It is configured to give priority to high temperature operation of the hot water storage can body 1 and to automatically shift to low temperature operation when the heating operation switch 16 is turned off. In the case of low temperature operation, the electric mixing valve 3 is locked and hot water cannot be supplied.

<Effects> The present invention has the above configuration and is a water heater with a heating operation function that is capable of hot water supply, heating operation, and low temperature operation for freezing prevention. When the heating operation switch is on, high temperature operation is performed regardless of whether the low temperature operation switch is on or off, and low temperature operation is performed only when the heating operation switch is off and the low temperature operation switch is on. Therefore, by turning on both the heating operation switch and the low temperature operation switch, heating can be performed while the heating operation switch is on, and when the heating operation switch is turned off, it will automatically switch to low temperature operation. be able to. As a result, switching from heating to anti-freezing operation is automatically performed at night during winter, eliminating the hassle of operating a switch every time the operation mode is changed, making use of the water heater extremely convenient.

Furthermore, if the electric mixing valve can be used only during high-temperature operation, the inconvenience of supplying low-temperature water without realizing it can be eliminated.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram showing an embodiment of the present invention, Fig. 2 is a flow chart showing an example of temperature control, and Fig. 3 is a flowchart showing an example of temperature control.
The figure is an electrical circuit diagram of the remote control section and the control section. 1: Hot water storage can body, 2: Burner, 3: Electric mixing valve, 5: Circulation pump, 6: Heat radiator, 8: Remote control unit, 9: Operation switch, 15: Low temperature operation switch, 16: Heating operation switch, 17 : Microcomputer, 20: Control unit.

Claims (1)

[Scope of Claims] 1. In addition to the hot water supply function that controls high-temperature water from the hot water storage can to a set temperature using an electric mixing valve and releases hot water, the hot water that has been heat exchanged in the hot water storage can is circulated to the radiator. A high-temperature operation that has a heating operation function and heats and maintains the hot water in the hot water storage can at a set high temperature for hot water supply and heating, and a low-temperature operation that heats and maintains the hot water in the hot water storage can at a low temperature to prevent freezing. The temperature control device for a water heater with a heating operation function is configured to switch between the high temperature operation and the low temperature operation, and when the heating operation switch is on, the low temperature operation switch is turned on and off. A temperature control control device for a water heater with a heating operation function, characterized in that the high temperature operation is performed regardless of the presence or absence of the heating operation, and the low temperature operation is performed only when the heating operation switch is off and the low temperature operation switch is on. 2. The temperature control device for a water heater with a heating operation function according to claim 1, which enables the use of an electric mixing valve during high temperature operation and disables the use of the electric mixing valve during low temperature operation.