JPH08296843A - Combustion apparatus - Google Patents

Abstract

PURPOSE: To efficiently set the gas pressure of combustion capacity at the time of altering gas type. CONSTITUTION: A central value memory 10 stores the central values of the minimum valve opening drive current and the maximum valve opening drive current of gas types. The minimum capacity correction value storage unit 20 and the maximum capacity correction value storage unit 21 of a correction value memory 11 store the correction values of the central values of the minimum and maximum valve opening drive currents due to the external input of setting gas pressure. At the time of setting the gas pressure after the gas type is altered, the gas type is switched to be selected by a gas type changeover switch 15, correction value cleaning means 16 receives the switch signal, clears the data of the units 20 and 21 and then stores the new correction values of the gas type after the alteration. A correction calculator 12 adds the correction value to the central value to obtain the minimum and maximum valve opening drive currents obtained by the correction calculation, controls the valve opening amount of a proportional valve 5 within the range of the minimum and maximum valve opening drive currents obtained by the correction amount to light a burner 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to combustion equipment such as a water heater for controlling the amount of heat of combustion within a gas pressure set range of maximum combustion capacity and minimum combustion capacity.

[0002]

2. Description of the Related Art As shown in FIG. 4, a water heater generally known as a combustion device opens a solenoid valve 4 and a gas supply amount in a gas passage 3 of a burner 2 for heating a hot water heat exchanger 1. A proportional valve 5 that is controlled by the valve amount is interposed, and the control device 6 controls the opening amount of the proportional valve 5 and the combustion heat amount of the burner 2.

As is well known, the hot water heater heats the water entering from the hot water supply pipe 7 by the combustion heat of the burner 2 into hot water when the hot water supply heat exchanger 1 passes through the hot water supply pipe 8. The hot water is supplied to a desired hot water supply place such as a kitchen via the.

The water heater is provided with a hot water supply capacity such as No. 24, and the burner combustion heat quantity is controlled within the range of the minimum combustion capacity and the maximum combustion capacity set according to the hot water supply capacity. At the factory shipment stage of the water heater, the maximum combustion capacity and the minimum combustion capacity are set by the gas pressure (gas pressure on the output side of the proportional valve 5).

Specifically, the gas pressure of the minimum combustion capacity is set as the value of the minimum valve opening drive current of the proportional valve 5, and the gas pressure of the maximum combustion capacity is set by the value of the maximum valve opening drive current of the proportional valve 5. To be done. The minimum and maximum valve opening drive currents are performed as follows by operating the two variable resistors (volumes) and operating the mode changeover switch while the burner 2 is burned.

The mode selector switch is designed to switch between the operating position with the minimum combustion capacity, the operating position with the maximum combustion capacity, and the operating position for operation. By changing the resistance value by operating the variable resistor for capacity adjustment, the valve opening drive current supplied to the proportional valve 4 changes, and the valve opening amount of the proportional valve 5 changes accordingly. A pressure gauge such as a manometer is connected to the output side of the proportional valve 5, and the gas pressure corresponding to the change in the opening amount of the proportional valve 5 is detected by the pressure gauge, and the gas pressure corresponds to the minimum combustion capacity. Then, the operation of the volume is stopped, and the valve opening drive current at this time is set as the minimum valve opening drive current.

Next, the mode selector switch is switched to the operating position with the maximum combustion capacity, and similarly, the variable resistor for adjusting the maximum capacity is operated to change the valve opening drive current of the proportional valve 5 to change the gas pressure to the pressure. The operation of the variable resistor is stopped when the gas pressure reaches the maximum combustion capacity, and the valve opening drive current at this time is set as the maximum valve opening drive current corresponding to the maximum combustion capacity.

After the setting of the minimum valve opening drive current and the maximum valve opening drive current is completed, the control unit 6 switches the mode selector switch to the operation mode position for operation.
When the burner 2 burns, the valve opening drive current (opening amount) of the proportional valve 5 is controlled within the range of the minimum burning capacity and the maximum burning capacity to variably adjust the amount of gas supplied to the burner 2 so that the hot water outlet temperature changes. Combustion control is performed to reach the set temperature.

[0009]

Gases such as 13A, 6A, 4A, 6B, propane, butane, etc. are used as the gas species of the fuel gas of the burner 2, and these gas species are different depending on the region. . Normally, at the time of factory shipment of combustion equipment, the gas pressure set (combustion capacity adjustment setting) of maximum combustion capacity and minimum combustion capacity is set assuming the gas type used at the destination, but it was shipped to a different destination. When a combustor such as a water heater is installed in an area with a different gas type due to relocation of a house, etc., the gas type will be changed (the different calorific value of combustion will be different). It will be necessary to redo the gas pressure setting of capacity.

This gas pressure renewal setting work is carried out with the burner 2 in a combusted state, but in the conventional appliances, the minimum combustion capacity and the maximum combustion capacity are adjusted and set by the operation of the variable resistor. When setting the mode selector switch to the operating position with the minimum combustion capacity and the operating position with the maximum combustion capacity and burning the burner 2 for the first time, it is difficult to determine which position the variable resistor volume adjustment position should be set to burn. Especially, when the gas type having a large combustion heat quantity is changed, it is difficult to find the volume adjustment position for starting the combustion of the burner 2 favorably because the resistance value of the variable resistor is greatly changed, and the combustion ability is adjusted. There was a problem that a lot of useless time was spent in the work in the stage before performing.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to change the gas type.
It is an object of the present invention to provide a combustion device that can immediately burn a burner in a good combustion state to efficiently set the gas pressure of the combustion capacity when the gas pressure set of the combustion capacity is updated and set.

[0012]

In order to achieve the above object, the present invention is constructed as follows. That is, the present invention includes a proportional valve that controls the amount of gas supplied to the burner according to the valve opening amount, and for this proportional valve, the maximum valve opening drive current corresponding to the maximum combustion capacity and the minimum valve opening corresponding to the minimum combustion capacity. The drive current is adjusted and set, and in the combustion equipment that controls the valve opening drive current within the range of the maximum valve opening drive current and the minimum valve opening drive current during combustion operation to control the combustion heat quantity of the burner. Gas type switching means for switching and selecting the gas type, center value storage unit for storing the reference center values of the maximum combustion capacity and the minimum combustion capacity for each gas type, and selection by the gas type switching means in the gas pressure set mode Value storage means for storing external input correction values for the respective reference center values of the maximum valve opening drive current and the minimum valve opening drive current of the selected gas type, and the gas type switching means. A correction value clearing means for receiving the gas type switching signal and clearing the correction value data before the gas type switching stored in the correction value storage section, and maximizing the gas type designated by the gas type switching means. It is characterized in that the reference center values of the combustion ability and the minimum combustion ability are corrected by the corresponding correction values, and the combustion operation is performed with the maximum valve opening drive current and the minimum valve opening drive current.

[0013]

In the present invention having the above structure, when the combustion capacity (gas pressure set) of the combustion equipment is updated and set by changing the gas type of the burner fuel, the gas type switching means is operated to change the gas type. Select the gas type you want to switch to.
In response to the gas type switching signal of the gas type switching means, the correction value clearing means, the correction values of the maximum valve opening drive current and the minimum valve opening drive current for the gas type before the change stored in the correction value storage unit. To zero.

In this state, the point ignition operation is performed, and the valve opening amount of the proportional valve is initialized by the valve opening drive current of the reference center values of the minimum and maximum designated combustion capacities of the updated gas species. The burner starts combustion in a good combustion state.

In this state, the gas pressure adjusting means adjusts the gas pressure (minimum valve opening drive current) corresponding to the minimum combustion capacity and the gas pressure having the maximum combustion capacity (maximum valve opening drive current), respectively. The amount of increase or decrease of the valve opening drive current, that is, the difference obtained by subtracting the reference center value from the minimum valve opening drive current value is used as the correction value for the center value of the minimum valve opening drive current, and the reference center value is calculated from the maximum valve opening drive current value. The subtracted difference is set as a correction value for the reference center value of the maximum valve opening drive current, and these correction values are stored in the correction value storage unit, and the gas pressure setting of the combustion capacity by changing the gas type is completed.

In the combustion operation after the completion of the gas pressure setting,
The value obtained by adding the correction value for the minimum combustion capacity to the reference center value is set as the minimum valve opening drive current, and the value obtained by adding the correction value for the maximum combustion capacity to the reference center value for the maximum combustion capacity is set as the maximum valve opening drive current. The gas pressure (valve-opening drive current) is varied within the range of the updated minimum combustion capacity and maximum combustion capacity to control the combustion operation.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the hot water supply device as shown in FIG. 4 is described as an example of the combustion device. The same components as those of the system shown in FIG. 4 are designated by the same reference numerals, and their duplicate description will be omitted. A characteristic of this embodiment is that a gas pressure setting (including a gas pressure updating set) means unique to the controller 6 of the water heater is configured. FIG. 1 shows a main configuration of a characteristic gas pressure setting means of the present embodiment, which includes a center value storage unit 10, a correction value storage unit 11, a correction calculation unit 12,
Correction data writing unit 13 and gas pressure correction current input unit 14
And a gas type changeover switch 15 as gas type changeover means and a correction value clearing means 16.

The gas pressure correction current input section 14 and the gas type changeover switch 15 are provided on the control board of the control unit 6 as shown in FIG. , Gas pressure up switch 18,
The gas pressure down switch 19 is included. The mode changeover switch 17 switches between the minimum combustion capacity position, the maximum combustion capacity position, and the operation position,
For example, each time the switch is pressed once, the minimum combustion capacity position, the maximum combustion capacity position, and the operating position are switched in a fixed order.

The gas pressure up and down switches 18 and 19 are composed of tact switches, and the gas pressure up switch
Each time 18 is pressed once, the proportional valve drive current of a predetermined amount is increased, and accordingly, the gas pressure on the output side of the proportional valve 5 is increased stepwise. Similarly, each time the gas pressure down switch 19 is pressed, a predetermined predetermined amount of proportional valve drive current is gradually reduced, and accordingly, the gas pressure at the proportional valve output side is gradually reduced. It is composed.

The gas type changeover switch 15 includes 13A, 6
A, 4A, 6B, butane, propane and the like are used to selectively set the gas type to be used, and the gas type switching signal is applied to the correction value clearing means 16 and the correction calculation section 12, respectively.

The center value storage unit 10 is an EEPROM which is a non-volatile memory capable of writing and erasing by electric signals,
It is composed of a memory such as a RAM backed up by a battery, etc., and has a center value of the minimum valve opening drive current corresponding to the minimum combustion capacity of each gas type and a center value of the maximum valve opening drive current corresponding to the maximum combustion capacity. Are stored respectively. The center value of each of the minimum valve opening drive current and the maximum valve opening drive current is, for example, an average value of the minimum valve opening drive currents of a plurality of water heaters of the same specification and the same model,
Similarly, the average value of the maximum valve opening drive currents of a plurality of water heaters is obtained in advance by experiments or the like and given.

The correction value storage unit 11 is also composed of a non-volatile EEPROM capable of writing and erasing by an electric signal, a memory such as a RAM backed up by a battery, and has a minimum capacity correction value storage section 20 and a maximum capacity correction value storage. And a part 21. The minimum capacity correction value storage unit 20 stores a correction value for the center value of the minimum valve opening drive current corresponding to the minimum combustion capacity, and the maximum capacity correction value storage unit 21 stores the maximum opening capacity corresponding to the maximum combustion capacity. The correction value for the center value of the valve drive current is stored.

The correction value clearing means 16 stores in the minimum capacity correction value storage section 20 and the maximum capacity correction value storage section 21 of the correction value storage section 11 when receiving the gas type switching signal from the gas type switching switch 15. The correction value data before changing the gas type is cleared to zero.

The correction calculator 12 is a gas type changeover switch.
By receiving information on the gas type selected in 15, the center value of the minimum valve opening drive current corresponding to the minimum combustion capacity of the gas type selected by switching and the maximum valve opening drive current corresponding to the maximum combustion capacity The center value is read from the center value storage unit 10, and the correction value of the minimum valve opening drive current corresponding to the minimum combustion capacity after the gas type change is written in the minimum capacity correction value storage unit 20 of the correction value storage unit 11 and The maximum valve opening drive current correction value corresponding to the maximum combustion capacity after the gas type change written in the maximum capacity correction value storage unit 21 is read.

Then, the correction value of the minimum valve opening current read from the minimum capacity correction value storage unit 20 is added to the center value of the minimum valve opening driving current read from the center value storage unit 10 (If the correction value is negative, it is subtracted.) Obtain the maximum valve opening drive current after changing the gas type, and similarly, store the maximum capacity correction value storage unit in the center value of the maximum valve opening drive current read from the center value storage unit 10. The maximum valve-opening drive current corresponding to the maximum combustion capacity after changing the gas type is calculated by adding the correction value of the maximum valve-opening drive current read from 21. The values of the maximum valve opening drive current and the minimum valve opening drive current obtained by the correction calculation of the correction calculation unit 12 are added to the combustion control unit 9, and the combustion control unit 9 determines the minimum valve opening drive current obtained by the correction calculation. Within the range of the drive current and the maximum valve open drive current, the proportional valve current drive unit applies the valve open drive current to the proportional valve 5 to control the combustion heat amount of the burner 2.

In the present embodiment, the gas pressure update setting of the combustion capacity when changing the gas type of the water heater is performed as follows. First, the gas type to be changed is selectively set by switching the gas type changeover switch 15, and the correction value clearing means 16 receives the gas type changeover signal and the minimum capacity correction value storage unit 20 of the correction value storage unit 11 is received. Both the correction value data stored in and the correction value data stored in the maximum capacity correction value storage unit 21 are cleared to zero. After clearing this data, the mode changeover switch 17 is operated to the minimum combustion capacity position, and the burner 2 is burned by point ignition, so that the correction value data in the correction value storage unit 11 is cleared to zero. The center value of the minimum valve opening drive current stored in the center value storage unit 10, that is, the data value obtained by adding the correction value of zero to the center value is added to the combustion control unit 9 via the correction calculation unit 12, The burner 2 burns with the center value combustion capacity of the minimum combustion capacity (the gas pressure of the valve opening drive current with the center value of the proportional valve 5).

In the combustion state of the burner 2, the gas pressure up switch 18 and the gas pressure down switch 19 are operated to adjust the proportional valve drive current up or down so that the gas pressure is set to the minimum combustion capacity. When adjusting this valve opening drive current,
As in the conventional example, as shown by the broken line in FIG.
Switch 8 from the proportional valve current driver by operating 8 and 19.
The valve-opening drive current supplied to the proportional valve 5 is changed according to the up / down switch operation of 8 and 19, and accordingly,
The valve opening amount of the proportional valve 5 changes and the gas pressure changes.

The change in gas pressure is detected by the pressure gauge, and when the gas pressure reaches the set gas pressure of the minimum combustion capacity, the switch is activated.
The operation of 18 and 19 is stopped, and the valve opening drive current at the stop position is determined as the correction value of the minimum valve opening drive current (gas pressure of the minimum combustion capacity) corresponding to the minimum combustion capacity, and the correction value is the correction data. It is added to the writing unit 13. Next, when the mode changeover switch 17 is pressed, the operating position is switched to the maximum combustion capacity. At this time, the correction data writing unit 14 stores the correction value of the valve opening drive current having the minimum combustion capacity in the correction value storage unit 11. Write to the minimum capacity correction value storage unit 20.

Since the maximum capacity correction value storage unit 21 of the correction value storage unit 11 does not store the correction value when the mode changeover switch 17 reaches the operating position of the maximum combustion capacity,
From the correction calculation unit 12, the center value of the maximum valve opening drive current stored in the center value storage unit 10 is read, and that value, that is, the data obtained by adding the correction value of zero to the center value, is used for combustion control. In addition to the portion 9, the proportional valve current driving portion supplies the proportional valve 5 with the valve opening driving current having the center value of the maximum combustion capacity, and the burner 2 burns.

In the combustion state of the burner 2, the gas pressure up switch 18 and the gas pressure down switch 19 are operated to change the maximum valve opening drive current (gas pressure corresponding to the maximum combustion capacity) with respect to the center value of the maximum combustion capacity. The correction value is determined, and the determined correction value is added to the correction data writing unit 13. Then, when the mode switch 17 is switched to the next operation mode position, the correction data writing unit 13 writes the correction value of the maximum valve opening drive current in the maximum capacity correction value storage unit 21 of the correction value storage unit 11.

By the way, the timing of writing the correction values for the center values of the minimum valve opening drive current value and the maximum valve opening drive current determined by the operation of the switches 18 and 19 into the storage units 20 and 21 is as described above. In addition to writing in accordance with the switch switching timing of the changeover switch 17, when the combustion is stopped while the correction value determined by operating the switches 18 and 19 is set during gas pressure setting (for example, the operation switch is turned off or running water is detected). The writing may be performed when an off signal for stopping the flowing water is issued from the flowing water switch to stop the burner combustion) or when a write execution command is issued, and the timing of writing can be set appropriately.

After the correction value storage unit 11 stores the correction value of the minimum valve opening drive current corresponding to the minimum combustion capacity and the correction value of the maximum valve opening drive current corresponding to the maximum combustion capacity as described above. The mode switch 17 is set to the operation mode position. In this state, if combustion operation is commanded,
The correction calculation unit 12 uses the center value of the minimum valve opening drive current stored in the center value storage unit 10 (the center value of the gas type selected by the switch 15) as the minimum capacity correction value storage unit of the correction value storage unit 11. The value obtained by adding the correction value of the minimum valve opening drive current stored in 20 (subtracting when the correction value is negative) is obtained as the minimum valve opening drive current (minimum combustion capacity) of the changed gas type, and similarly. The center value of the maximum valve opening drive current stored in the center value storage unit 10 (center value of the gas type selected by the switch 15) is stored in the maximum capacity correction value storage unit 21 of the correction value storage unit 11. The maximum valve-opening drive current of the changed gas type (maximum combustion capacity) is obtained by adding the correction value of the maximum valve-opening drive current (subtracting if the correction value is negative)
Then, the correction calculation results are added to the combustion control unit 9.

The combustion control unit 9 has a sequence program for combustion operation, and according to this sequence program, corresponds to the maximum valve opening drive current value corresponding to the maximum combustion capacity obtained by the correction calculation unit 12 and the minimum combustion capacity. The proportional valve drive current supplied from the proportional valve current drive unit to the proportional valve 5 is controlled in accordance with the required combustion heat quantity within the range of the minimum valve drive current to be set, and the burner 2 is heated to supply hot water at a set temperature. Controls the heat of combustion.

Next, the operation of updating and setting the combustion capacity when changing the gas type will be described with reference to FIG. First, step 10
By operating the gas type changeover switch 15 at 1, it is determined whether or not there is a request for changing the gas type. When it is determined by the operation of the gas type changeover switch 15 that there is a request for changing the gas type, the minimum valve opening drive current of the gas type before the change stored in the correction value storage unit 11 in the next step 102. And the maximum valve drive current correction value are cleared to zero.

Next, at step 103, the correction value for the center value of the minimum valve opening drive current corresponding to the minimum combustion capacity adjusted by the switch operation of the above-mentioned various switches 17 to 19 and the maximum combustion capacity are corresponded. The correction values for the center value of the maximum valve opening drive current are stored in the storage units 20 and 21 of the corresponding correction value storage unit 11, respectively. By storing this correction value, the gas pressure update setting of the combustion capacity by changing the gas type is completed, but when the subsequent combustion operation is performed, the minimum combustion capacity of the gas type changed and selected by the gas type changeover switch 15 is selected. The center values of the maximum combustion capacity and the maximum combustion capacity are read into the correction calculation unit 12 in step 104. Then, in step 105, the correction values corresponding to the respective center values of the minimum combustion capacity and the maximum combustion capacity are added to obtain the valve opening drive current of the minimum combustion capacity and the valve opening drive current of the maximum combustion capacity. The burner 2 is burned by controlling the valve-opening drive current according to the required combustion heat quantity within the range of the minimum valve-opening drive current and the maximum valve-opening drive current.

According to this embodiment, the center values of the minimum combustion capacity and the maximum combustion capacity of each gas type are stored in advance in the center value storage unit.
When the gas type selection switch 15 is operated to switch and select the gas type, the center values of the minimum valve opening drive current and the maximum valve opening drive current corresponding to the gas type selected for switching are stored. Since each is read out to the correction calculation unit 12, a troublesome gas pressure preliminary setting (preliminary setting of valve opening drive current) for favorably initial combustion of the burner 2 at the time of capacity setting (gas pressure setting) when changing the gas type When the gas type to be changed is selected by the gas type changeover switch 15 and is switched to the minimum combustion capacity position by the mode changeover switch 17, the burner 2 immediately sets the center value of the minimum combustion capacity. When the combustion capacity is good (valve opening drive current), the mode change switch 17 is switched to the operating position with the maximum combustion capacity, and the burner 2 is at its maximum. It will be well burned with the combustion capability of the valve-opening drive current center value of the combustion capability,
It is possible to quickly and efficiently set the gas pressure for the minimum combustion capacity and the maximum combustion capacity.

Further, in this embodiment, when the gas type is changed by operating the gas type changeover switch 15, the correction values stored in the storage units 20 and 21 of the correction value storage unit 11 before the gas type changeover are performed. Since it is cleared to zero, there is an effect that the burner 2 can be satisfactorily burned when the gas pressure is set after the gas type is changed, as described above. That is, in the case of a configuration in which the correction values of the storage units 20 and 21 are not cleared to zero when the gas type changeover switch 15 changes over the gas type, the mode changeover switch 17 causes the operating position of the minimum combustion ability and the maximum combustion ability to be changed. When the operation position is switched to, the correction calculation unit 12 stores the center values of the minimum and maximum valve opening drive currents of the changed gas type in the storage unit 20,
Since the correction value before changing the gas type stored in 21 is added and the initial combustion of the burner 2 is performed, the burner 2 cannot be satisfactorily burned, and before the gas pressure is set,
As in the conventional example, it is necessary to carry out a preliminary adjustment to make the burner 2 satisfactorily perform the initial combustion, but in the present embodiment, as described above, by switching the gas type changeover switch 15,
Since the correction values stored in the storage units 20 and 21 before changing the gas type are cleared to zero, the burner 2 is satisfactorily subjected to initial combustion with the center values of the minimum valve opening drive current and the maximum valve opening drive current. Therefore, it is possible to obtain an excellent effect that it is not necessary to make a troublesome adjustment for the initial combustion of the burner 2 every time the gas pressure is set.

The present invention is not limited to the above-mentioned embodiment, and various embodiments can be adopted. For example, although the above embodiment has been described by taking a single-function water heater as shown in FIG. 4 (a water heater having only a hot water supply function) as an example, the burner 2 having the hot water supply function and the reheating function as shown in FIG. (Bath function)
It is also applied to a combined water heater using a plurality of burners of the above-mentioned burner 22. Also in this case, by providing the gas pressure setting means shown in FIG. 1 for both the hot water supply function and the reheating function, the gas pressure setting of the combustion capacity of the burner 2 having the hot water supply function and the combustion of the burner 22 having the reheating function are performed. The gas pressure of the capacity can be set in the same manner as in the above-mentioned embodiment.

Further, in the above-described embodiment, the example in which the gas pressure of the combustion capacity is set by manually operating the various switches 15, 17 to 19 has been described, but the combustion is performed by using the gas pressure automatic setting device. The gas pressure of the capacity may be automatically set. In this case, the gas pressure automatic setting device is connected to the water heater, and the switches 15, 17 to 19 are operated by the input of the sequence program of the gas pressure automatic setting device to detect the gas pressure on the output side of the proportional valve 5. The pressure detection signal of the pressure gauge is fetched to the gas pressure automatic setting device side, this pressure detection value is fetched, the minimum valve drive current and the maximum valve drive current correction values are determined, and the determined correction values are set to the gas pressure. Correction current input section 14
In addition, the gas pressure of the water heater (combined water heater) can be automatically set.

Further, in the above-mentioned embodiment, the combined hot water supply and reheating boiler of FIG. 5 has been described as an example of a plurality of combustion systems. However, it may be a combined hot water supply and heating water heater.
Further, it may be a combined water heater for hot water supply, reheating and heating. In the example of FIG. 5, the common proportional valve 5 is used to control the burner 2 on the hot water supply side and the burner 22 on the reheating side. However, of course, separate proportional valves are used to control the hot water supply side and the reheating side. The amount of gas supplied to the burner may be controlled.

[0041]

According to the present invention, the center value storage unit stores the center value of the minimum valve opening drive current corresponding to the minimum combustion capacity of each gas species and the center value of the maximum valve opening drive current corresponding to the maximum combustion capacity. In addition, the correction value storage unit stores the correction value for the center value of the minimum valve opening drive current corresponding to the minimum combustion capacity and the correction value for the center value of the maximum valve opening drive current corresponding to the maximum combustion capacity by external input. It is configured to clear the correction value stored in the correction value storage unit before the gas type is changed when the gas type is switched and selected by the gas type switching means. When the gas pressure of the combustion capacity is set by, when the gas type is selected by the gas type switching means, the correction value data stored in the correction value storage unit is cleared. Therefore, when setting the gas pressure of the minimum combustion capacity, the burner satisfactorily burns with the combustion capacity of the valve opening drive current of the center value of the minimum valve opening drive current corresponding to the minimum combustion capacity of the gas species to be changed, and similarly, Even when setting the gas pressure of the maximum combustion capacity, the burner will perform good initial combustion with the combustion capacity of the center value of the maximum valve opening drive current corresponding to the changed maximum combustion capacity of the gas type, and the gas type will be changed. When the gas pressure is set later, the conventional problem of having to perform preliminary adjustment of the gas pressure (valve opening drive current) for good initial combustion of the burner can be solved. It is possible to achieve an excellent effect that the gas pressure of the combustion capacity after the species change can be set extremely efficiently and quickly.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a switch configuration for a gas pressure adjustment set in the same embodiment.

FIG. 3 is a flowchart showing a gas pressure setting operation of the same embodiment.

FIG. 4 is a system explanatory view of a general water heater as a combustion device.

FIG. 5 is a system explanatory view of a combined water heater generally known as a combustion device.

[Explanation of symbols]

 10 Center value storage unit 11 Correction value storage unit 12 Correction calculation unit 13 Correction data writing unit 14 Gas pressure correction current input unit 15 Gas type selection switch 16 Correction value clearing means 20 Minimum capacity correction value storage section 21 Maximum capacity correction value storage section

Claims (1)

[Claims] 1. A proportional valve for controlling the amount of gas supplied to the burner according to the valve opening amount, wherein the proportional valve has a maximum valve opening drive current corresponding to the maximum combustion capacity and a minimum valve opening drive corresponding to the minimum combustion capacity. The burner fuel gas whose current is adjusted and set and which controls the valve opening drive current within the range of the maximum valve opening drive current and the minimum valve opening drive current according to the combustion capacity during combustion operation to control the combustion heat of the burner A gas type switching means for switching and selecting the species, a center value storage section for storing the reference center values of the maximum combustion capacity and the minimum combustion capacity for each gas type, and a gas type switching means for selecting the gas pressure setting mode. Correction value storage unit for storing the correction value of the external input for each reference center value of the maximum valve opening drive current and the minimum valve opening drive current of the gas type, and the gas type of the gas type switching means. And a correction value clearing means for receiving the switching signal and clearing the correction value data before the gas type switching stored in the correction value storage section, and the maximum combustion capacity of the gas type designated by the gas type switching means. Combustion equipment configured to perform combustion operation using the values obtained by correcting the respective reference center values of the minimum combustion capacity with the corresponding correction values as the maximum valve opening drive current and the minimum valve opening drive current.