JP2589926B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus in which adjustment value data is stored in a nonvolatile semiconductor memory.

[0002]

2. Description of the Related Art For example, in a hot air heater, a DIP switch and a semi-fixed VR are conventionally used for setting a misfire determination level, adjusting a fan speed, and adjusting a proportional valve current. However, since the DIP switch usually has only about four to seven circuits in capacity, the adjustment value cannot be finely adjusted. If the DIP switch is used in large numbers, a large amount of space is occupied and the cost of parts increases. Also, semi-fixed V
For R, the sliding piece moves due to vibration or the like, and the adjustment value shifts.

[0003]

Therefore, the present inventors have
When the adjustment / write mode setting switch is pressed during the normal operation mode, the mode shifts to the adjustment / write mode in which the misfire determination level, the fan current, the proportional valve current, etc. can be adjusted by the adjustment means, and the write switch is pressed during the mode. Then, a prototype of a warm air heater in which the adjustment value data relating to the adjustment value was stored in a semiconductor nonvolatile memory (E ² PROM) was manufactured.

However, when the adjustment and writing mode setting switch is pressed, the warm air heater immediately shifts from the normal operation mode to the adjustment and writing mode. The problem that the adjusted value data was easily stored was found. Incidentally, when the operation while storing the incorrect adjustment value data E ² PROM, it can not be performed is normal operation,
Comfort is impaired.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a combustion device in which adjustment value data relating to an adjustment value of a safety circuit or a control circuit for controlling a combustion actuator is stored in a semiconductor nonvolatile memory. Is stored in a semiconductor non-volatile memory.

[0006]

In order to solve the above-mentioned problems,
The present invention provides a safety circuit, adjustment means for adjusting an adjustment value of a control circuit for controlling a combustion actuator, a semiconductor nonvolatile memory in which adjustment value data can be electrically rewritten, and an adjustment value adjusted by the adjustment means. Convert to adjustment value data,
A write circuit that stores the semiconductor nonvolatile memory, a read circuit that reads adjustment value data stored in the semiconductor nonvolatile memory and converts the data into adjustment values of the safety circuit and the control circuit, A normal operation mode in which the operation of the means and the write circuit is inhibited and the read circuit is activated, a test mode in which the operation of the adjustment means and the write circuit is inhibited and the combustion actuator is adjusted, or the adjustment means and the write circuit A mode control circuit for setting any one of the write modes, and a test mode setting switch and a write mode setting switch, which are electrically connected to the mode control circuit. When the test mode setting switch is operated, the operation mode of the combustion device is shifted to the test mode, and the test mode is set. Operation of the write mode setting switch has adopted a configuration in which shift to be the write mode performed during.

[0007]

In the normal operation mode, the readout circuit reads out the adjustment value data stored in the semiconductor nonvolatile memory and converts it into an adjustment value. Based on the adjustment value, the safety circuit monitors safety, and the control circuit reads the combustion actuator. Control. When the adjustment operator operates the test mode setting switch, the combustion device shifts from the normal operation mode to the test mode, and the adjustment operator adjusts the combustion actuator. When the adjusting operator operates the writing mode setting switch during the test mode, the combustion apparatus shifts to the writing mode, and the adjusting operator adjusts the adjustment values of the safety circuit and the control circuit by the adjusting means. The writing circuit converts the adjustment value into adjustment value data and stores the adjustment value data in the semiconductor nonvolatile memory.

[0008]

The write mode in which the adjustment value data can be stored in the semiconductor nonvolatile memory only when the adjusting operator operates the test mode setting switch to change the test mode from the normal operation mode to the test mode and then operates the write mode setting switch. Move to For this reason, the possibility that incorrect adjustment value data is stored in the semiconductor nonvolatile memory due to an erroneous operation by an operator or the like can be greatly reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the gas warm air heater R includes a gas combustor 1 that burns at a first to eighth speed combustion level, a thermocouple 2 that detects abnormal combustion, and a gas amount supplied to the gas combustor 1. , A convection fan 4 for supplying combustion air to the gas combustor 1, and a control unit 5 for controlling the proportional valve 3, the convection fan 4, and the like. Also, 6
Is the heater housing, 61 is the indoor air k and the gas combustor 1
611 is a thermistor for detecting room temperature, and 7 is a gas pipe.

The gas combustor 1 includes a ceramic combustion plate 1.
1, a combustion cylinder 12 having a sparker sp and a thermocouple 2 disposed therein, a gas g ejected from a nozzle n disposed downstream of the air guide path 61, and indoor air k guided by the air guide path 61. And a mixing chamber 13.

The thermocouple 2 is disposed close to the upper surface of the combustion plate 11, is exposed to a combustion flame, and sends out an electric output according to the combustion state of the gas combustor 1.

The proportional valve 3 is provided with a gas g
This is a valve for adjusting the amount of gas, and the amount of passing gas increases in proportion to the amount of electricity.

The convection fan 4 includes an impeller 41 pivotally mounted in a duct 67 downstream of the gas combustor 1, and an impeller 41.
And a motor 42 for driving the motor.

The gas pipe 7 is provided with solenoid valves 71 and 72 and the proportional valve 3 in order from the upstream side, and is connected to the nozzle n.
The proportional valve 3 has a gas governor for keeping the secondary gas pressure constant, and the gas governor further includes a gas amount adjusting screw for adjusting the gas supply amount at the first combustion level. I have.

The heater housing 6 is provided with suction ports 64 and 65 for room air k used for mixing and combustion at an upper portion on a back surface thereof.
An outlet 66 is provided at the lower part of the front surface. Above inlet 6
Filters 4 and 65 for removing dust in the room are detachably provided in the doors 4 and 65, and a louver 661 for changing a blowing direction of the hot air w is attached to the outlet 66. In addition, 6
Reference numeral 7 denotes a duct that connects the suction port 65 and the air outlet 66.

As shown in FIG. 2, the control unit 5 includes a combustion amount determination circuit 51, a proportional valve drive circuit 52, a fan control circuit 53, a misfire detection circuit 54, a mode control circuit 55, and E ² P
It includes a ROM 56, a writing circuit 561, a reading circuit 562, an operation control circuit 57, and a notification circuit 58.

In the normal operation mode, the combustion amount determination circuit 51 determines the combustion level (based on the difference between the set temperature set by the temperature setting switches (+) (-) 511 and 512) and the room temperature detected by the thermistor 611. 1st speed to 8th speed). In the test mode, the combustion level is fixed to the first speed for adjusting the gas amount adjusting screw. Further, at the time of proportional valve current adjustment and writing and at the time of fan Hi rotation speed adjustment and writing,
The combustion level is fixed to the seventh speed, and is fixed to the first speed at the time of adjusting the fan Lo speed and writing.

The proportional valve drive circuit 52 determines the proportional valve current values at the first to sixth and eighth speeds based on the proportional valve current adjustment values at the seventh speed read from the E ² PROM 56 by the read circuit 562. Then, in the normal operation mode, a proportional valve current corresponding to the combustion level determined by the combustion amount determining circuit 51 is supplied to the proportional valve 3.

The fan control circuit 53 determines each fan current in the second to sixth speeds and the eighth speed based on the respective fan current values in the first speed and the seventh speed read from the E ² PROM 56 by the reading circuit 562. Then, in the normal operation mode, a fan current corresponding to the combustion level determined by the combustion amount determination circuit 51 is supplied to the motor 42.

When the magnitude of the electric output transmitted from the thermocouple 2 does not reach the Lo-side and Hi-side misfire determination levels, which will be described later, and are set in correspondence with the respective combustion level groups, the misfire detection circuit 54 performs gas combustion. The controller 1 determines that the burner 1 is in an abnormal combustion state (oxygen-deficient combustion, misfire) and sends a misfire detection signal to the operation control circuit 57.

The mode control circuit 55 controls the operation mode of the gas hot air heater R by pressing a test switch (normally open push switch which is closed only when pressed) 550, which is a test mode setting switch. Then, the mode is shifted from the normal operation mode to the test mode, and the combustion level is fixed to the first speed. In the test mode, adjustment of each adjustment value and writing of adjustment value data to the E ² PROM 56 cannot be performed, and adjustment of the gas supply amount at the first combustion level is performed by turning the gas amount adjustment screw.

In the test mode, the gas switch 55 on the substrate, which is a write mode setting switch,
1, proportional valve switch 552, fan Lo switch 55
3. When the fan Hi switch 554 (both normally open push switches that are closed only when pressed) is pressed, the operation mode of the gas hot air heater R is changed from the test mode to L, respectively.
o-side / Hi-side misfire determination level adjustment and writing mode,
The mode is shifted to the proportional valve current adjustment / write mode, the fan Lo speed adjustment / write mode, and the fan Hi speed adjustment / write mode, and the combustion level is fixed at a predetermined speed.

Further, a Lo / Hi side misfire determination level adjustment / write mode, a proportional valve current adjustment / write mode, a fan Lo speed adjustment / write mode, a fan H
In the i-number-of-rotations adjusting / writing mode, the writing circuit 561 converts each adjustment value into adjustment value data by re-pressing the gas switch 551, the proportional valve switch 552, the fan Lo switch 553, and the fan Hi switch 554, respectively. Stored in the E ² PROM 56, and the mode control circuit 55
The operation mode of the gas hot air heater R is shifted to a normal operation mode (in the case of the misfire determination level adjustment / write mode) or a test mode (in the case of another adjustment / write mode).

In the normal operation mode, the mode control circuit 55 prohibits the operation of adjusting the respective adjustment values by the temperature setting switches (+) (-) 511 and 512 and the operation of the writing circuit 561. In this mode, the temperature setting switch
(+) (-) 511 and 512 are used for increasing and decreasing the set temperature. In the test mode, the mode control circuit 55
Prohibits the adjustment operation of each adjustment value by the temperature setting switches (+) (-) 511 and 512 and the operation of the writing circuit 561. In the Lo / Hi side misfire determination level adjustment / write mode, the proportional valve current adjustment / write mode, the fan Lo speed adjustment / write mode, and the fan Hi speed adjustment / write mode, the mode control circuit 55 sets the temperature setting. Setting of Lo-side and Hi-side misfire determination levels for each of the first to second speed and third to eighth speed combustion level groups by switches (+) and (-) 511 and 512; adjustment of proportional valve current at seventh speed; It enables the adjustment of the fan current at the 7th speed and the 7th speed, and permits the operation of the writing circuit 561.

E ² PROM 56 having a capacity of several k bits
Discloses that a floating gate is formed in an insulator of SiO ₂ , and charges are stored in the gate using a tunnel effect to store adjustment value data. It should be noted that the number of rewritable times is 10 ⁵ times or more and the retention period is 10 years or more.
The adjustment value data stored in the E ² PROM 56 includes those relating to the Lo-side / Hi-side misfire determination level,
It relates to the proportional valve current at the seventh speed and the fan current at the first speed and the seventh speed.

In each of the adjusting and writing modes, the write circuit 561 is configured to control the Lo-side / Hi-side misfire determination level, the adjustment value of the proportional valve current at the seventh speed, or the fan current of the convection fan 4 at the first speed and the seventh speed. Is converted to each adjustment value data, and E ²
This is a circuit for writing to the PROM 56.

The read circuit 562 operates in all modes in E.
² Reads each adjustment value data written in the PROM 56 and determines Lo for each combustion amount of the first speed to the second speed and the third speed to the eighth speed.
The misfire detection circuit 54, the proportional valve drive circuit 52, and the fan control circuit 53 are converted into a misfire determination level for the side / Hi side, an adjustment value of the proportional valve current at the seventh speed, and a fan adjustment current value at the first speed / seventh speed. To send to.

The operation control circuit 57 includes an operation switch 571
Is turned on, the solenoid valves 71, 7 are arranged in a predetermined sequence.
2. Control the sparker sp and the louver motor 572 to bring the gas combustor 1 into a combustion state. When a misfire detection signal is input from the misfire detection circuit 54, the combustion of the gas combustor 1 is stopped.

The notification circuit 58 is configured to control the gas lamp 581, the proportional valve lamp 582, the fan Hi lamp 583, and the fan Lo based on each control information signal input from each control circuit.
Lamp 584 (these are arranged on the substrate), indicator 585 (four-digit seven-segment LED), buzzer 58
6, and combustion monitor lamp (weak, medium, strong, steep) 587
Control.

Next, the Lo side H of the gas hot air heater R
Adjustment and writing of i-side misfire determination level, proportional valve current adjustment and writing at seventh speed, fan L at first speed and seventh speed
o, the operation related to Hi rotation speed adjustment and writing are shown in FIGS.
This will be described together with the flowchart of FIG.

During the normal operation mode (step s1), it is determined whether the test switch 550 is pressed (step s2).
If the answer is YES, the process proceeds to step s3, and if the pressing is not determined (No in step s2), the process returns to step s1, and
Continue the normal operation mode. In step s3, the mode is shifted to the test mode, and the combustion level is fixed to the first speed. During this test mode loop (from step s3 to step s)
NO at step 4 → NO at step s6 → NO at step s8 →
In step s24, NO in step s36, NO in step s49, and NO in step s3), the gas supply amount is adjusted with the gas amount adjusting screw. In step s4, it is determined whether the operation switch 571 is on or off. If it is determined that the operation switch 571 is off (YES), the process proceeds to step s5, and the gas warm air heater R normally stops. If it is determined to be on (NO), the process proceeds to step s6. In step s6, it is determined whether or not an abnormality is present.
The gas hot air heater R stops abnormally. If it is not determined that there is an abnormality (NO), the process proceeds to step s8. In step s8, the pressing state of the gas switch 551 is determined. If the pressing is determined (YES), the process proceeds to step s9. If the pressing is not determined (NO), the process proceeds to step s2.
Proceed to 4. In step s9, the mode is shifted to the adjustment / write mode of the Lo / Hi side misfire determination level, the buzzer is sounded a predetermined number of times, and the gas lamp 581 is turned on.

At step s10, a temperature setting switch (+)
The pressing state of 511 is determined, and the pressing is determined (YE
S), the process proceeds to step s11, and the pressing is not determined (N
O) In case of, proceed to step s17. In step s11,
The display of the Hi-side misfire determination level on the display 585 is started (displayed in the left two digits), and the process proceeds to step s12. In step s12, the pressing state of the gas switch 551 is determined. If the pressing is determined (YES), the process proceeds to step s13. If the pressing is not determined (NO), the process proceeds to step s14.
Proceed to. In step s13, the adjustment value data relating to the Hi-side misfire determination level is written in the E ² PROM 56, and after turning off the gas lamp 581, the process returns to step s1 and shifts to the normal operation mode. Switch). In step s14, the pressing state of the temperature setting switch (+) 511 is determined. If the pressing is determined (YES), the process proceeds to step s15. If the pressing is not determined (NO), the process proceeds to step s16. In step s15, every time the temperature setting switch (+) 511 is pressed, H
The display of the i-side misfire determination level is changed from 12 mV (X) to 14 m.
V (Y) → 16mV (Z) → 12mV (X)... And the process returns to step s11. In step s16, the pressing state of the temperature setting switch (-) 512 is determined. If the pressing is determined (YES), the process proceeds to step s18. If the pressing is not determined (NO), the process returns to step s11.
In step s17, the pressing state of the temperature setting switch (-) 512 is determined. If the pressing is determined (YES), the process proceeds to step s18. If the pressing is not determined (NO),
It returns to step s10. In step s18, the display 58
The display of the Lo-side misfire determination level for No. 5 is started (displayed in the right two digits), and the process proceeds to step s19. In step s19, the pressing state of the gas switch 551 is determined. If the pressing is determined (YES), the process proceeds to step s20. If the pressing is not determined (NO), the process proceeds to step s21. In step s20, the adjustment value data relating to the Lo side misfire determination level is written in the E ² PROM 56, and after turning off the gas lamp 581, the process returns to step s1 and shifts to the normal operation mode. Switch). In step s21, the temperature setting switch (-) 512
Is determined, and if the pressing is determined (YES), the process proceeds to step s22, and the pressing is not determined (N
O) In case of, proceed to step s23. In step s22,
Each time the temperature setting switch (-) 512 is pressed, the display of the Lo side misfire determination level is changed from 12 mV (X ₂ ) to 14 mV.
(Y ₂ ) → 16 mV (Z ₂ ) → 12 mV (X ₂ )... And the process returns to step s18. In step s23,
The pressing state of the temperature setting switch (+) 511 is determined, and if the pressing is determined (YES), the process returns to step s11,
If the pressing is not determined (NO), the process returns to step s18.

At step s24, the proportional valve switch 552
Is determined, and if the pressing is determined (YES), the process proceeds to step s25, and the pressing is not determined (N
O) In case of, proceed to step s36. In step s25,
The mode shifts to the proportional valve current adjustment / write mode, and the buzzer 58
6 is sounded a predetermined number of times to turn on the proportional valve lamp 582, and then the process proceeds to step s26. In step s26, the combustion level is fixed at the seventh speed, and the flow proceeds to step s27. In step s27, the display of the proportional valve current on the display 585 is started, and the flow proceeds to step s28. In step s28, the pressing state of the proportional valve switch 552 is determined. If the pressing is determined (YES), the process proceeds to step s29. If the pressing is not determined (NO), the process proceeds to step s30. In step s29, the adjustment value data relating to the adjustment value of the proportional valve current at the seventh combustion level is written into the E ² PROM 56, the buzzer 586 is sounded a predetermined number of times, and the proportional valve lamp 58 is activated.
After turning off No. 2, the process proceeds to step s36 and returns to the test mode. In step s30, the temperature setting switch (+) 51
The pressing state of No. 1 is determined, and if the pressing is determined (YES), the process proceeds to step s31, and the pressing is not determined (N
O) In case of, proceed to step s33. In step s31, it is determined whether or not the correction current value is within 30 mA.
If yes (YES), proceed to step s32
If it exceeds 0 mA (NO), the process returns to step s27 without increasing the proportional valve current. In step s32, the proportional valve current is increased by 1 mA, and the process returns to step s27. In step s33, the pressing state of the temperature setting switch (-) 512 is determined, and if the pressing is determined (YES), the process proceeds to step s33.
Proceeding to 34, if the pressing is not determined (NO), the process returns to step s27. In step s34, the correction current value is -30.
It is determined whether or not the current is equal to or greater than mA, and if it is equal to or greater than -30 mA (YES), the process proceeds to step s35. If it is less than -30 mA (NO), the process returns to step s27 without decreasing the proportional valve current. In step s35, the proportional valve current is set to 1 m
A is decreased, and the process returns to step s27.

At step s36, the fan Lo switch 5
The pressing state of 53 is determined, and the pressing is determined (YES).
In this case, the process proceeds to step s37, and the pressing is not determined (N
O) In case of, proceed to step s49. In step s37,
The mode shifts to the fan Lo speed adjustment / write mode, the buzzer 586 is sounded a predetermined number of times, the fan Lo lamp 584 is turned on, and the process proceeds to step s38. Step s38
Then, the combustion level is fixed to the first speed, and the process proceeds to step s39. In step s39, the display of the fan current on the display 585 is started, and the process proceeds to step s40. Step s40
Then, the pressing state of the fan Lo switch 553 is determined, and if the pressing is determined (YES), the process proceeds to step s44. If the pressing is not determined (NO), the process proceeds to step s41.
Proceed to. In step s41, the temperature setting switch (+) 51
1 is determined, and if the pressing is determined (YES), the process proceeds to step s42, and the pressing is not determined (N
O) In case of, proceed to step s46. In step s42, it is determined whether or not the correction current value is within 50 mA.
If yes (YES), the process proceeds to step s43
If it exceeds 0 mA (NO), the process returns to step s39 without increasing the fan current. In step s43, the fan current is increased by 1 mA, and the process returns to step s39. In step s44, the adjustment value data relating to the Lo-side fan current is written into the E ² PROM 56, the buzzer 586 is sounded a predetermined number of times, the fan Lo lamp 584 is turned off, and the process proceeds to step s45. In step s45, the display of the fan current is turned off, and the process proceeds to step s50. In step s46, the pressing state of the temperature setting switch (-) 512 is determined. If the pressing is determined (YES), the process proceeds to step s47. If the pressing is not determined (NO), the process returns to step s39.
In step s47, it is determined whether or not the correction current value is -50 mA or more. If the correction current value is -50 mA or more (YES), the process proceeds to step s48. If the correction current value is less than -50 mA (NO), the process proceeds without reducing the fan current. It returns to s39.
In step s48, the fan current is reduced by 1 mA, and the process returns to step s39. In step s49, test switch 5
The pressing state of No. 50 is determined, and the pressing is not determined (NO)
In this case, the process returns to step s3 to maintain the test mode. If the pressing is determined (YES), the process returns to step s1, exits the test mode, and shifts to the normal operation mode.

At step s50, the fan Hi switch 5
The pressing state of 54 is determined, and the pressing is determined (YES).
In this case, the process proceeds to step s51. In step s51, the mode shifts to the fan Hi speed adjustment and writing mode, and the buzzer 5
86 is sounded a predetermined number of times to turn on the fan Hi lamp 583, and the flow proceeds to step s52. In step s52,
The combustion level is fixed at the seventh speed, and the routine proceeds to step s53. In step s53, display of the fan current on the display 585 is started, and the flow advances to step s54. In step s54, the pressing state of the temperature setting switch (+) 511 is determined. If the pressing is determined (YES), the process proceeds to step s55. If the pressing is not determined (NO), the process proceeds to step s57. In step s55, it is determined whether or not the correction current value is within 50 mA, and if it is within 50 mA (YES),
Proceed to step s56 to exceed 50 mA (NO)
In this case, the process returns to step s53 without increasing the fan current. In step s56, the fan current is increased by 1 mA, and the process returns to step s53. In step s57, the pressing state of the temperature setting switch (-) 512 is determined. If the pressing is determined (YES), the process proceeds to step s58. If the pressing is not determined (NO), the process proceeds to step s60. In step s58, it is determined whether or not the correction current value is -50 mA or more, and if it is -50 mA or more (YES), step s58
Proceeding to 59, if below -50 mA (NO), return to step s53 without reducing the fan current. Steps
At 59, the fan current is reduced by 1 mA and the process returns to step s53. In step s60, the pressing state of the fan Hi switch 554 is determined, and if the pressing is determined (YES),
Proceed to step s61. When the pressing is not determined, the process returns to step s53. In step s61, the adjustment value data relating to the Hi-side fan current is written into the E ² PROM 56, the buzzer 586 is sounded a predetermined number of times, and the fan H
The i lamp 583 is turned off, and the process proceeds to step s62. In step s62, the fan current display is turned off, and in step s4
9 and the mode is shifted to the test mode.

The gas warm air heater R has the following advantages. (A) The adjustment operator presses the test switch 550, which is a test mode setting switch, to shift the operation mode of the gas hot air heater R from the normal operation mode to the test mode. Gas switches 551, proportional valve switches 552, which are setting switches,
Fan Lo switch 553 or Fan Hi switch 5
Only when the button 54 is pressed, the Lo side / Hi side misfire determination level, the proportional valve current at the seventh speed, and the Lo side / Hi side
Lo can adjust and write fan current on the side
In this configuration, the mode shifts to the side / Hi side misfire determination level adjustment / write mode, the proportional valve current adjustment / write mode, the fan Lo speed adjustment / write mode, and the fan Hi speed adjustment / write mode. In other words, when the test switch 550 is pressed during the normal operation mode, the operation immediately shifts to the test mode without immediately shifting to the respective adjustment and writing modes. The operator can do so, and incorrect adjustment value data
^{2 The} possibility of being stored in the PROM 56 can be reduced.

(I) Test switch 550, gas switch 551, proportional valve switch 552, fan Lo · H
The i-switches 553 and 554 are provided on the board of the control unit 5 in the heater housing 6 that is not touched by the user. Therefore, it is safe that a general user does not accidentally change the misfire determination level, the proportional valve current, and the fan current.

(C) Gas lamp 581, proportional valve lamp 582, fan Hi lamp 58 disposed on the substrate
If the adjustment operator sees the lighting status of 3, or the fan Lo lamp 584, it is easy to see which adjustment and writing mode is currently selected.

(E) At the time of each adjustment and writing, the gas hot air heater R adjusts data on the Lo / Hi side misfire determination level for each combustion level group, adjustment value data on the proportional valve current, and fan current. Adjustment value data is E ² P
The data is stored in the ROM 56, and the readout circuit 562 reads out these adjustment value data, and the misfire detection circuit 54, the proportional valve drive circuit 5
2, the Lo / Hi side misfire determination level of the fan control circuit 53, the proportional valve current at the seventh speed, and the fan current at the first speed and the seventh speed. The E ² PROM 56 is
Even if a mechanical shock such as vibration is applied to the control unit 5, each adjustment value data does not fluctuate structurally. Therefore, the misfire determination by the misfire detection circuit 54, the control of the proportional valve current by the proportional valve drive circuit 52, and the fan control circuit 53
The control reliability of the convection fan 4 is excellent.

The present invention includes the following embodiments in addition to the above embodiment. a. An E ² PROM 56 such as an MNOS type or a MAOS type may be used. b. In the above embodiment, the adjustment value data of the integer value is stored in the E ² PROM 56, but a decimal value may be stored. c. Temperature adjustment switch (+) (-) 5 when adjusting and writing proportional valve current and adjusting and writing fan Lo and Hi speed
If an auto increment or auto decrement function is added to 11, 512, the adjustment time can be reduced. For example, if the pressed state continues for more than 0.2 seconds, 0.1
At second intervals, the fan current and the proportional valve current are increased or decreased by ± 1 mA.

[Brief description of the drawings]

FIG. 1 is a structural diagram of a gas hot air heater according to one embodiment of the present invention.

FIG. 2 is a block diagram of the gas warm air heater.

FIG. 3 is a flowchart illustrating an operation of a control unit of the gas hot air heater.

FIG. 4 is a flowchart illustrating an operation of a control unit of the gas warm air heater.

FIG. 5 is a flowchart illustrating an operation of a control unit of the gas warm air heater.

FIG. 6 is a flowchart illustrating an operation of a control unit of the gas hot air heater.

FIG. 7 is a flowchart illustrating an operation of a control unit of the gas hot air heater.

[Explanation of symbols]

R Gas hot air heater (combustion device) 3 Proportional valve (combustion actuator) 42 Motor (combustion actuator) 52 Proportional valve drive circuit (control circuit) 53 Fan control circuit (control circuit) 54 Misfire detection circuit (safety circuit) 55 Mode control circuit 56 E ² PROM (semiconductor nonvolatile memory) 511 Temperature setting switch (+) (adjusting means) 512 Temperature setting switch (-) (adjusting means) 550 Test switch (test mode setting switch) 551 Gas switch (write mode) Setting switch) 552 Proportional valve switch (writing mode setting switch) 553 Fan Lo switch (writing mode setting switch) 554 Fan Hi switch (writing mode setting switch) 561 Writing circuit 562 Reading circuit

Continuation of the front page (56) References JP-A-4-45316 (JP, A) JP-A-3-195818 (JP, A) JP-A-56-74523 (JP, A) JP-A-62-288417 (JP) JP-A-5-99432 (JP, A) JP-A-6-229549 (JP, A)

Claims (1)

(57) [Claims] An adjusting means for adjusting an adjustment value of a safety circuit or a control circuit for controlling a combustion actuator; a semiconductor nonvolatile memory in which adjustment value data can be electrically rewritten; and an adjustment value adjusted by the adjusting means. And a read circuit for reading the adjustment value data stored in the semiconductor non-volatile memory and converting the data to an adjustment value for the safety circuit and the control circuit. The operation mode is a normal operation mode in which the operation of the adjusting means and the writing circuit is inhibited and the reading circuit is operated, a test mode in which the operation of the adjusting means and the writing circuit is inhibited and the combustion actuator is adjusted, A mode control circuit for setting the write mode to operate the adjusting means and the write circuit; and a tester electrically connected to the mode control circuit. A mode setting switch and a write mode setting switch, wherein the mode control circuit shifts the operation mode of the combustion device to the test mode when the test mode setting switch is operated during the normal operation mode, and during the test mode. Wherein the operation switches to the writing mode when the writing mode setting switch is operated.