JP3487964B2 - Combustion equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention
Hot water supply that controls the amount of combustion heat within the gas pressure setting range of the burning capacity
The present invention relates to a combustion device such as a vessel. 2. Description of the Related Art A supply generally known as a combustion apparatus is known.
The water heater heats the hot water supply heat exchanger 1 as shown in FIG.
The solenoid valve 4 and the gas supply amount are opened in the gas passage 3 of the burner 2.
And a proportional valve 5 controlled by the control device 6
The amount of opening of the proportional valve 5 is controlled by the
Is controlled. As is well known, a water heater is inserted from a water supply pipe 7.
When water is passed through the hot water supply heat exchanger 1, the burner 2
It is heated by burning power to make hot water, and this hot water is passed through hot water supply pipe 8
To a desired hot water supply place such as a kitchen to supply hot water.
is there. There are hot water heaters such as No. 24
Capacity is given and set according to this hot water supply capacity
Burner combustion heat within the range of minimum and maximum combustion capacity
The amount of water is controlled, and this maximum
The combustion capacity and the minimum combustion capacity depend on the gas pressure (at the output side of the proportional valve 5).
Gas pressure). Specifically, the gas pressure of the minimum combustion capacity is proportional
Set as the value of the minimum valve opening drive current of the valve 5, and set the maximum combustion
The gas pressure of the capacity is set by the value of the maximum valve opening drive current of the proportional valve 5.
Is done. The minimum and maximum valve opening drive currents burn the burner 2.
Operation of two variable resistors (volume) in the fired state
Operate as follows by operating the mode switch.
Have been The mode changeover switch has a minimum combustion capacity.
Operating position, operating position of maximum combustion capacity, and operating position of operation
Mode switching mode.
Set the switch to the operating position with the minimum combustion capacity and adjust the minimum capacity.
The resistance value by operating the variable resistor
As a result, the valve opening drive current supplied to the proportional valve 4 changes,
Accordingly, the opening amount of the proportional valve 5 changes. Output of proportional valve 5
Connect a pressure gauge such as a manometer to the force side, and open the proportional valve 5.
The gas pressure corresponding to the change in the valve amount is detected by a pressure gauge, and the minimum fuel
At the position where the gas pressure corresponds to the firing capacity, operate the volume
Operation is stopped, and the valve opening drive current at this time is reduced to the minimum valve opening drive current.
Set as flow. Next, the mode switch is set to the maximum combustion mode.
Switch to the working position of the capacity, and
Operate the variable resistor to change the drive current for opening the proportional valve 5.
Gas pressure with a pressure gauge to detect the maximum combustion capacity gas pressure.
Stop the operation of the variable resistor when
Maximum valve opening drive current corresponding to maximum combustion capacity
Set as [0008] The setting of the minimum valve opening drive current and the maximum valve opening drive current
After the setting is completed, set the mode switch to
By switching to the operation mode position, the control device 6
When burning the burner 2, the minimum combustion capacity and the maximum combustion capacity
By controlling the valve opening drive current (valve opening amount) of the proportional valve 5 within the range,
The amount of gas supplied to the burner 2 is variably adjusted, and
Combustion control is performed so as to reach the set temperature. [0009] Incidentally, the burner 2
13A, 6A, 4A, 6B, P
Gases such as lopan and butane are used.
Varies from region to region. Usually a combustion equipment factory
At the time of shipment, the maximum combustion capacity is assumed assuming the type of gas used at the destination.
Gas pressure set for power and minimum combustion capacity (combustion capacity adjustment
), But shipped to a different destination
Combustion equipment, such as water heaters, differs due to house relocation, etc.
When installed in a gas type area, the gas type will change.
(The calorific value of combustion differs for different gas types)
First, it is necessary to redo the gas pressure setting of the combustion capacity. In this gas pressure update setting operation, the burner 2 is
It is performed in a state where it is burned.
The power and maximum combustion capacity are adjusted by operating the variable resistor.
Mode switch is set to minimum combustion
First to the operating position of the capacity and the operating position of the maximum combustion capacity
When burning burner 2, the volume of the variable resistor
It is difficult to determine the adjustment position to burn
In particular, the combustion heat has been changed to a gas type that differs greatly.
The resistance of the variable resistor varies greatly
Above, the volume adjustment position where the burner 2 starts burning well
Is difficult to find, and before adjusting the combustion capacity
The problem is that a lot of wasted time is spent on work
Was. The present invention has been developed to solve the above-mentioned conventional problems.
The purpose is to change the gas type,
When updating the gas pressure set of the combustion capacity,
Immediately in a good combustion condition to efficiently burn
Providing a combustion device that can perform force gas pressure update settings
Is to do. The present invention achieves the above object.
In order to do so, it is configured as follows. That is, the book
The invention controls the amount of gas supplied to the burner by the amount of valve opening
The proportional valve has a maximum combustion capacity for this proportional valve.
Corresponding maximum valve opening drive current and minimum corresponding to minimum combustion capacity
The valve opening drive current is adjusted and set, and the combustion
Within the range of maximum valve opening drive current and minimum valve opening drive current according to force
Control the valve opening drive current to control the burner combustion heat
Select and select the burner fuel gas type
Gas type switching means and the maximum combustion capacity for each gas type
Center where the reference center value of the minimum combustion capacity is stored
-Value storage and gas type switching in gas pressure setting mode
The maximum valve-opening drive current and the maximum
External input for each reference center value of small opening drive current
A correction value storage unit for storing a correction value;
Receiving the gas type switching signal of the means into the correction value storage unit
Click the stored correction value data before changing the gas type.
Resetting means for resetting the gas type.
Maximum combustion capacity and minimum combustion of gas species specified by stage
Each reference center value of ability is based on the corresponding correction value.
And the minimum valve opening drive current
And a combustion operation is performed. According to the present invention having the above structure, the burner fuel gas
By changing the species, the combustion capacity (gas pressure set) of the combustion equipment
When setting the update, operate the gas type switching means.
Then, the gas type is switched to the gas type to be changed and selected.
The gas type switching means receives a gas type switching signal.
The correction value clear means is stored in the correction value storage unit.
Valve opening drive current and minimum valve opening for gas type before change
Clears each correction value of drive current to zero. In this state, the point ignition operation is performed and the updated
Of the specified minimum and maximum specified combustion capacity of the
The opening amount of the proportional valve is initially set by the
Once set, the burner starts burning in good combustion conditions. In this state, the gas pressure adjusting means
Gas pressure (minimum valve opening drive current) and maximum corresponding to combustion capacity
Gas pressure of combustion capacity (maximum valve opening drive current) is individually adjusted
The amount of increase or decrease in the valve opening drive current
And subtract the reference center value from the minimum valve opening drive current value.
Difference between the correction value for the center value of the minimum valve opening drive current and the
And subtract the reference center value from the maximum valve opening drive current value.
Difference between the reference center value of the maximum valve opening drive current and
These are set as positive values, and these correction values are
The gas stored in the storage unit and whose combustion capacity is changed by changing the gas type
The pressure setting ends. In the combustion operation after the end of the gas pressure setting,
The value obtained by adding the correction value of the minimum combustion capacity to the reference center value is
The reference center for maximum combustion capacity as the minimum valve opening drive current
The value obtained by adding the maximum combustion capacity correction value to the maximum
Flow rate, and this updated set minimum combustion capacity and
Variable gas pressure (valve opening drive current) within maximum combustion capacity
Thus, the combustion operation is controlled. Embodiments of the present invention will be described below with reference to the drawings.
I do. In this embodiment, a hot water supply as shown in FIG.
The system configuration is shown in FIG.
Parts that are the same as the parts are given the same reference numerals, and duplicate explanations are omitted.
Abbreviate. What is characteristic in this embodiment is that the control of the water heater is
Gas pressure set unique to control device 6 (including gas pressure update set)
(M) means is configured. FIG. 1 shows the features of this embodiment.
The main part of the typical gas pressure setting means
A 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 switch as gas type switching means.
Switch 15 and correction value clear means 16.
You. Gas pressure correction current input unit 14 and gas type switching
The switch 15 is, as shown in FIG.
The gas pressure correction current input section 14 is
Mode changeover switch 17, gas pressure up switch 18,
A gas pressure down switch 19 is provided. Mo
The mode changeover switch 17 is set between the minimum combustion capacity position and the maximum
It switches between the combustion capacity position and the operation position.
For example, each time the switch is pressed once,
Cut in the order in which the maximum combustion capacity position and the operation position were determined.
It has been replaced. The gas pressure up / down switches 18 and 19 are
Composed of tact switch, gas pressure up switch
Each time you press 18, a predetermined amount of proportional valve drive current
And the gas pressure on the output side of the proportional valve 5 increases accordingly.
It is configured to be raised stepwise. Similarly, gas pressure
Each time the down switch 19 is pressed, a predetermined amount of
The proportional valve drive current gradually decreases, and the proportional
The gas pressure on the valve output side is gradually reduced.
You. The gas type changeover switch 15 is a 13A, 6
Gas types used such as A, 4A, 6B, butane, propane
Is set by switching the switch.
The gas type switching signal is supplied to the correction value clear means 16 and the correction operation.
The calculation unit 12 is added to each. The center value storage unit 10 writes data by an electric signal.
EEPROM of nonvolatile memory that can be stored and erased,
Memory such as RAM backed up by a battery
And the minimum combustion capacity for each gas type.
Corresponds to the center value of the small valve opening drive current and the maximum combustion capacity.
And the center value of the maximum valve opening drive current
ing. These minimum valve opening drive current and maximum valve opening drive current
Each center value is, for example, the same
The average value of the minimum valve opening drive current of multiple water heaters of one model,
Similarly, the average value of the maximum valve opening drive current of multiple water heaters is
Given by experimentation. The correction value storage unit 11 is also written by an electric signal.
Non-volatile EEPROM that can be read and erased, battery
Memory such as RAM backed up by
The minimum capacity correction value storage unit 20 and the maximum capacity correction value
The storage unit 21 is provided. The minimum capacity correction value storage unit 20 stores
Center value of minimum valve opening drive current corresponding to small combustion capacity
The correction value for the maximum capacity is stored.
The storage section 21 is provided with a maximum valve opening drive current corresponding to the maximum combustion capacity.
The correction value for the center value is stored. The correction value clear means 16 is a gas type switching switch.
When a gas type switching signal is received from the switch 15,
The minimum capacity correction value storage unit 20 of the correction value storage unit 11 and the maximum capacity
Of the correction value before the gas type change stored in the positive value storage unit 21
Clear the data to zero. The correction operation unit 12 includes a gas type changeover switch.
Receives information on the gas type selected in 15, and switches
The minimum combustion capacity of the selected gas type.
Corresponds to the center value of the small valve opening drive current and the maximum combustion capacity.
Center value of the maximum valve opening drive current
Read from the storage unit 10, and further read the minimum value of the correction value storage unit 11.
Minimum after changing the gas type written to the capacity correction value storage unit 20
Correction value of minimum valve opening drive current corresponding to combustion capacity and maximum value
Maximum after changing gas type written to capacity correction value storage unit 21
Reads the correction value of the maximum valve opening drive current corresponding to the combustion capacity
You. Then, the data is read from the center value storage unit 10.
The minimum capacity correction value is stored in the center value of the minimum valve opening drive current
Add the correction value of the minimum valve opening current read from section 20
(If the correction value of the minimum valve opening drive current is negative, subtraction
) Determine the maximum valve opening drive current after changing the gas type, and
The maximum valve opening drive power read from the center value storage
Read from the maximum capacity correction value storage unit 21 to the center value of the flow
The correction value of the maximum valve opening drive current
Find the maximum valve opening drive current corresponding to the maximum combustion capacity. This
The maximum valve opening drive determined by the correction calculation of the correction
The values of the dynamic current and the minimum valve opening drive current are added to the combustion control unit 9.
Then, the combustion control unit 9 determines the maximum value obtained by this correction calculation.
Proportional valve voltage within the range of small valve opening drive current and maximum valve opening drive current
The valve opening drive current is applied to the proportional valve 5 from the
The amount of heat of combustion of the nozzle 2 is controlled. In this embodiment, when the gas type of the water heater is changed,
The gas pressure update setting of the combustion capacity is performed as follows. Ma
The gas type changeover switch 15
The gas type to be changed is selected and set.
Receiving the output signal, the correction value clearing means 16 stores the correction value.
The correction stored in the minimum capacity correction value storage unit 20 of the storage unit 11
Value data and stored in the maximum capacity correction value storage unit 21.
The correction value data are both cleared to zero. This data
After the rear, operate the mode changeover switch 17 to minimize combustion
Burning the burner 2 by igniting in the capacity position
Clears the correction value data in the correction value storage unit 11 to zero.
Are stored in the center value storage unit 10.
The center value of the minimum valve opening drive current
The data value obtained by adding zero of the correction value to the value passes through the correction operation unit 12.
And the burner 2 has the minimum combustion capacity.
Center value combustion capacity (center value opening of proportional valve 5)
It burns with the driving current (gas pressure). In the combustion state of the burner 2, the minimum combustion capacity
Gas pressure up switch 18 so that the set gas pressure of
Operate the gas pressure down switch 19 to increase the proportional valve drive current.
Adjust up and down. In adjusting the valve opening drive current,
As in the conventional example, as shown by the broken line in FIG.
Operate switches 8 and 19 to switch from proportional valve current drive to switch 1
Proportional to correspond to 8, 19 up / down switch operations
The valve-opening drive current supplied to the valve 5 varies, and accordingly,
The amount of opening of the proportional valve 5 changes and the gas pressure changes. This gas pressure change is detected by a pressure gauge, and the gas pressure is measured.
When the gas pressure reaches the minimum combustion capacity setting,
Stop the operation of 18, 19, and the valve opening drive current at the stop position is
Minimum valve opening drive current corresponding to minimum combustion capacity (minimum combustion capacity
(Gas pressure of force) is determined as the correction value.
It is added to the positive data writing unit 13. Next, switch mode
When the change switch 17 is pressed, it switches to the operating position with the maximum combustion capacity.
However, at this time, the correction data writing unit 14
The correction value of the valve opening drive current for the small combustion capacity is stored in the correction value storage unit 11.
Write to the minimum capacity correction value storage unit 20. The mode switching switch 17 has the maximum combustion capacity
When the operating position is reached, the maximum capacity of the correction value
Since no correction value is stored in the force correction value storage unit 21,
The correction calculation unit 12 stores the data stored in the center value storage unit 10.
The center value of the maximum valve opening drive current
That is, the data obtained by adding the correction value of zero to the center value.
Is added to the combustion control unit 9 and the proportional valve current drive unit
The valve drive current of the center value of the maximum combustion capacity is supplied to the valve 5.
The burner 2 is burned. In the combustion state of the burner 2, the gas pressure increases.
Operate switch 18 and gas pressure down switch 19
Maximum valve opening drive current (max.
Determine the correction value of (gas pressure corresponding to the combustion capacity)
The determined correction value is added to the correction data writing unit 13. Soshi
Mode switch 17 to the next operation mode position.
When switching, the correction data writing unit 13 opens
The drive current correction value is stored in the maximum capacity correction value table of the correction value storage unit 11.
Write it in the storage section 21. By the way, by operating the switches 18 and 19,
Each of the determined minimum valve opening drive current value and maximum valve opening drive current
For writing correction values to the storage values 20 and 21
Imming is performed by setting the mode switch 17 as described above.
Other than writing in accordance with switch switching timing
The correction value determined by operating switches 18 and 19 is
When the combustion is stopped during the pressure setting (for example,
Switch is turned off or the water flow switch detects running water.
The burner combustion was stopped due to the off signal of running water stoppage
Etc.) or when a write execution command is issued
The write timing can be set appropriately.
Can be determined. As described above, the minimum value is stored in the correction value storage unit 11.
Correction value of minimum valve opening drive current corresponding to combustion capacity and maximum fuel
The correction value of the maximum valve opening drive current corresponding to the burning capacity is stored.
Mode switch 17 is set to the operation mode position.
Set. In this state, when the combustion operation is commanded,
The correction operation unit 12 is stored in the center value storage unit 10.
Center value of minimum valve opening drive current (selected by switch 15)
Of the corrected gas type)
Of the minimum valve opening drive current stored in the force correction value storage unit 20.
Change the value obtained by adding the correction value (subtracting if the correction value is negative).
The minimum valve opening drive current (minimum combustion capacity)
And similarly stored in the center value storage unit 10.
Center value of the maximum valve opening drive current (selected by switch 15)
(The center value of the selected gas type)
Maximum valve opening drive current stored in capacity correction value storage unit 21
Is added (or subtracted if the correction value is negative)
Maximum valve opening drive current of the changed gas type (maximum combustion capacity)
The correction calculation results are added to the combustion control unit 9.
I get it. [0033] The combustion control unit 9 includes a sequencer for the combustion operation.
Program, and follow the sequence program
The maximum opening corresponding to the maximum combustion capacity determined by the
Valve drive current value and minimum valve opening drive corresponding to minimum combustion capacity
Proportional valve current according to the required combustion heat within the dynamic current range
Controls proportional valve drive current supplied to proportional valve 5 from drive unit
Control the combustion heat of burner 2 to supply hot water at the set temperature.
Control. Next, based on FIG. 3, the fuel at the time of changing the gas type will be described.
The operation of the update setting of the burning capacity will be described. First, step 10
1 Change the gas type by operating the gas type selector switch 15.
It is determined whether a further request has been made. Gas type switching
There was a request to change the gas type by operating switch 15.
If it is determined that the
Minimum opening drive of gas type before change stored in storage unit 11
Current and maximum valve opening drive current correction values are cleared to zero
Is done. Next, in step 103, the various scans described above are performed.
Minimum combustion adjusted by operating switches 17-19
For the center value of the minimum valve opening drive current corresponding to the capacity
The correction value and the maximum valve opening drive current corresponding to the maximum combustion capacity
Correction value notation for each correction value for the center value
It is stored in the storage units 20 and 21 of the storage unit 11. Storage of this correction value
Setting of gas pressure for combustion capacity by changing gas type
Complete, but when the subsequent combustion operation is performed, the gas
The gas type selected and changed by the type changeover switch 15
The center values of small combustion capacity and maximum combustion capacity are
In step 104, the data is read by the correction calculation unit 12. And
At step 105, each of the minimum and maximum combustion capacity
The correction value corresponding to the center value of
The drive current for opening the valve and the drive current for opening the maximum combustion capacity are determined.
The minimum valve opening drive current and the maximum
Valve opening drive according to required combustion heat within the range of large valve opening drive current
The kinetic current is controlled, and the burner 2 is burned. According to this embodiment, the minimum combustion capacity of each gas type
The center value of the power and the maximum combustion capacity is stored in advance in the center value storage unit.
Stored in 10 and operated by gas type changeover switch 15
When the gas type is switched and selected,
Minimum valve opening drive current and maximum valve opening for selected gas type
The center value of the drive current is read out to the correction calculation unit 12, respectively.
At the time of changing the gas type (setting the gas pressure)
In addition, troublesome gas for causing the burner 2 to burn well at the initial stage
It is necessary to make preliminary setting of pressure (preliminary setting of valve opening drive current)
No, gas type changed by gas type changeover switch 15
Is selected for switching, and the mode
When switched to the minimum combustion capacity position
Means that the burner 2 immediately burns the center value of the minimum combustion capacity
Good combustion with the ability (valve opening drive current), mode switching
Switch 17 is switched to the operating position for maximum combustion capacity
Sometimes the burner 2 is driven to the center value of the maximum combustion capacity.
It will burn well with the combustion capacity of the kinetic current,
Quick and efficient gas pressure setting for minimum and maximum combustion capacity
It is possible to perform it. In this embodiment, the gas type switching switch is used.
When the gas type is switched by operating the switch 15, the gas type
Before switching, they are stored in the storage units 20 and 21 of the correction value storage unit 11.
Correction value was cleared to zero.
As described above, the combustion of the burner 2 at the time of setting the gas pressure is good.
The effect that it can be performed satisfactorily is obtained. sand
That is, when the gas type changeover switch 15 changes the gas type.
In the configuration, the correction values of the storage units 20 and 21 are not cleared to zero.
In this case, use the mode switch 17 to set the minimum
Switch between the operating position of the capacity and the operating position of the maximum combustion capacity
When the gas type after the change is
The storage unit 20 stores the center value of each of the minimum and maximum valve opening drive currents.
The correction value before the gas type change stored in 21 is added
Since the initial combustion of the burner 2 is performed, the burner 2
2 can not be burnt well, before setting the gas pressure,
Preliminary adjustment for satisfactorily initial burning of burner 2 as in the conventional example
Adjustment must be performed, but in this embodiment, the
As described above, by switching the gas type changeover switch 15,
Correction values stored in storage units 20 and 21 before gas type change
Since it is cleared to zero, the burner 2 is switched to the minimum valve opening drive current.
Good initial with the center value of the maximum valve opening drive current
Can be burned, each time the gas pressure setting, a troublesome burner
2. No need to make adjustments for initial combustion
The effect can be obtained. The present invention is not limited to the above embodiment.
Rather, various embodiments can be employed. For example, above
In the embodiment, a single-function water heater (water heater) as shown in FIG.
Noh only water heater) was described as an example, but as shown in FIG.
Burner 2 with una hot water supply function and reheating function (bath function)
Also suitable for combined water heaters using multiple burners of burner 22
Is used. In this case, the hot water supply function
Gas pressure setting means shown in FIG. 1 for both functions
As a result, the gas pressure setting of the combustion capacity of the burner 2 of the hot water supply function
And the gas pressure setting of the combustion capacity of the burner 22 of the reheating function
Can be performed in the same manner as in the above embodiment. In the above embodiment, various types of
Operate the switches 15, 17 to 19 to adjust the gas pressure of the combustion capacity.
As explained in the setting example, use an automatic gas pressure setting device.
And automatically set the gas pressure of the combustion capacity
No. In this case, connect an automatic gas pressure setting device to the water heater
And input the sequence program of the gas pressure automatic setting device
The switches 15, 17 to 19 are operated by
The pressure detection signal of the pressure gauge that detects the gas pressure on the output side
Takes in the automatic pressure setting device side and takes in this pressure detection value
The correction value of the minimum valve opening drive current and the maximum valve opening drive current
Determined, and the determined correction value is input to the gas pressure correction current input unit 14.
To the gas pressure of the water heater (combined water heater)
Cuts can be made automatically. Further, in the above embodiment, a plurality of combustion systems
As an example, the combined hot water supply and re-heating water heater shown in FIG.
As described, it may be a combined hot water supply and heating water heater,
Furthermore, there is a combined hot water supply, hot water reheating and heating
Is also good. In the example of FIG. 5, a common proportional valve 5 is used.
The burner 2 on the hot water supply side and the burner 22 on the reheating side are controlled.
However, of course, using a separate proportional valve,
Control the amount of gas supplied to the burner
Good. According to the present invention, each gas type is stored in the center value storage section.
Of minimum valve opening drive current corresponding to minimum combustion capacity
Value and the center of the maximum valve opening drive current corresponding to the maximum combustion capacity
Values and store them in the correction value storage unit by external input.
Is the center of the minimum valve opening drive current corresponding to the minimum combustion capacity.
Correction value and the maximum opening corresponding to the maximum combustion capacity.
Stores correction values for the center value of valve drive current respectively
The gas type is switched by the gas type switching means.
The gas type stored in the correction value storage
Whether the system is configured to clear the previous correction value
When the gas pressure is set for the combustion capacity by changing the gas type
The gas type is switched by the gas type switching means
The correction value stored in the correction value storage unit
Data is cleared, the gas pressure
When the burner is turned on, the burner
Valve opening drive current of the center value of the minimum valve opening drive current corresponding to
Good combustion with the combustion capacity of the stream, as well as maximum combustion
When setting the gas pressure of the capacity,
Center value of maximum valve opening drive current corresponding to maximum combustion capacity
Good initial combustion of the burner with the combustion capacity of
When setting the gas pressure after changing the gas type, set the burner
Prevent troublesome gas pressure (valve opening drive current) for initial combustion
Solve the conventional problem of having to make adjustments.
Can be extinguished.
Force gas pressure setting can be performed very efficiently and quickly
It is possible to achieve an excellent effect that

BRIEF DESCRIPTION OF THE 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 embodiment. FIG. 3 is a flowchart showing a gas pressure setting operation of the embodiment. FIG. 4 is an explanatory diagram of a system of a general water heater as a combustion device. FIG. 5 is a system explanatory diagram of a combined water heater generally known as a combustion device. [Description of Signs] 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 changeover switch 16 Correction value clear means 20 Minimum capacity correction value storage unit 21 Maximum Capacity correction value storage

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-123424 (JP, A) JP-A-5-282003 (JP, A) JP-A-5-288339 (JP, A) 220533 (JP, A) JP-A-62-231874 (JP, A) JP-A-5-79240 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 5/24 101 F24H 9/20

Claims (1)

(57) [Claim 1] A proportional valve for controlling the amount of gas supplied to the burner by the amount of valve opening, the maximum valve opening drive current corresponding to the maximum combustion capacity and the minimum for the proportional valve The minimum valve-opening drive current corresponding to the combustion capacity is adjusted and set, and during combustion operation, the valve-opening drive current is controlled within the range of the maximum valve-opening drive current and the minimum valve-opening drive current in accordance with the combustion capacity to control the burner combustion heat. Gas type switching means for switching and selecting a gas type of a burner fuel, a center value storage unit storing a reference center value of a maximum combustion capacity and a minimum center value of a minimum combustion capacity for each gas type, and a gas pressure set. A correction value storage unit that stores a correction value of an external input with respect to each reference center value of the maximum valve opening drive current and the minimum valve opening drive current of the gas type selected by the gas type switching unit in the mode; Correction value clearing means for receiving the gas type switching signal of the switching means and clearing the data of the correction value before the gas type switching stored in the correction value storage section, wherein the gas specified by the gas type switching means is provided. A combustion apparatus configured to perform a combustion operation by using a value obtained by correcting each of the reference center values of the maximum combustion capacity and the minimum combustion capacity of the species by a corresponding correction value as a maximum valve opening drive current and a minimum valve opening drive current.