JP3795855B2 - Adjustment method of combustion equipment - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to a method for adjusting individual differences in combustion equipment such as hot air heaters and water heaters.
[0002]
[Prior art]
Combustion equipment such as a hot air heater and a hot water heater is provided with a burner in which combustion is performed. A fan that supplies combustion air to the burner is provided in an air passage including the burner, and the rotation speed of the fan is the amount of combustion of the burner. There is known one provided with fan control means for controlling the fan current so as to coincide with the target rotational speed according to the above. The inventors of the present application, as disclosed in Patent Document 1 below, burns the burner even when the air filter or the like provided in the air passage gradually closes due to long-term use. Provides a hot air heater that controls the air to be appropriate.
[0003]
As the air filter blockage progresses, the fan load decreases, and the fan current for maintaining the fan speed at the target speed decreases. Along with this, the amount of air supplied to the burner is reduced, so that combustion of the burner cannot be properly maintained when the air passage is closed. Therefore, the hot air heater disclosed in Patent Document 1 is configured such that when the fan control means cannot maintain the fan rotation speed at the target rotation speed unless the fan current is set to a predetermined lower limit current value or less, Assuming that the filter is blocked, the fan current is maintained at the lower limit current value to operate the fan.
[0004]
As described above, in the hot air heater described in Patent Document 1 below, when the fan current is kept constant under a predetermined condition, the load of the fan is reduced when the air load gradually decreases and the fan load gradually decreases. This causes a relative increase in the number of rotations of the fan to ensure normal combustion of the burner.
[0005]
[Patent Document 1]
Japanese Patent No. 2615354 (page 3, FIG. 5)
[0006]
[Problems to be solved by the invention]
On the other hand, even in the case of combustion equipment manufactured according to the same standard, there are individual differences in the relationship between fan current and fan speed due to variations in parts such as fans or fan motors and microcomputers, and there is no blockage in the air passage Some fan currents are different even when the fan rotation speed is the same. However, conventionally, the lower limit current value is a constant value.
[0007]
Therefore, when the blockage of the air passage proceeds and the fan current is controlled at the lower limit current value, the fan rotation speed becomes higher or lower than the rotation speed necessary for normal combustion of the burner due to individual differences in the combustion equipment. There is a risk of becoming. If the fan rotational speed is higher than the rotational speed necessary for normal combustion of the burner, the combustion air becomes excessive, and there is a risk that abnormal combustion noise or lifting may occur from the burner. Conversely, if the fan speed is lower than that required for normal burner combustion, the combustion air becomes insufficient and the burner combustion becomes poor, and the drain generated by the burner combustion contains CO and is strongly acidic. Therefore, the durability of the portion where the drain adheres in the combustion apparatus may be reduced.
[0008]
Therefore, the present invention aims to improve the combustion equipment, and more specifically, in order to eliminate the inconvenience, even if there are individual differences in fan characteristics, the target rotational speed of the fan is appropriately set according to the increase in the degree of blockage of the air passage. It aims at providing the adjustment method of the combustion equipment which can be set to.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a method for adjusting a combustion device according to the present invention includes a fan that is provided in an air passage in which a burner is incorporated and that supplies combustion air to the burner, and the number of fan rotations is the amount of combustion of the burner. Fan control means for controlling the fan current so as to match the corresponding target rotational speed, and the fan control means reduces the fan current due to the degree of blockage of the air passage and is equal to or less than the lower limit current value stored in the storage means. A method of adjusting a combustion device that performs a lower limit current value control for holding the fan current at the lower limit current value when the lower limit current value control is being performed by the fan control means. The lower limit current value is adjusted so that the rotational speed is within a predetermined allowable range.
[0010]
In the combustion device, when the air passage is not blocked, the fan control means controls the fan current so that the fan rotation speed matches the target rotation speed according to the burner combustion amount. The burner burns well regardless of individual differences. In the present invention, the lower limit current value is adjusted so that the rotational speed of the fan is within a predetermined allowable range when the lower limit current value control is performed by the fan control means. By adjusting the lower limit current value, it is possible to eliminate individual differences among the combustion devices and to improve the combustion of the burner during the lower limit current value control. The term “within the allowable range” is a concept including a predetermined number of revolutions.
[0011]
In the method for adjusting a combustion device according to the present invention, the lower limit current value may be adjusted by controlling the fan current to the lower limit current value by the fan control means and determining whether the fan rotational speed is within a predetermined allowable range. When the fan rotational speed exceeds the allowable range, the lower limit current value may be changed so that the fan rotational speed is within the allowable range.
[0012]
In this way, when adjusting a plurality of combustion devices by adjusting the combustion device only when the fan rotation speed is out of the predetermined allowable range, the one that changes the lower limit current value is Since it is limited to a part, adjustment time can be shortened as a whole.
[0013]
Alternatively, in the adjustment of the lower limit current value, a reference rotation speed that is a reference within the allowable range of the rotation speed of the fan is determined in advance, and the fan control means sets the fan rotation speed to the reference rotation speed. The fan current at which the fan is at the reference rotational speed may be set as a new lower limit current value by controlling the current.
[0015]
As described above, when adjusting a plurality of combustion devices by adjusting the combustion devices only when the fan current is out of the predetermined allowable range, one of those that changes the lower limit current value is one of them. Therefore, the adjustment time can be reduced as a whole.
[0016]
In the method for adjusting a combustion device of the present invention, the lower limit current value is preferably adjusted at the time of maximum combustion and minimum combustion of the burner. Thus, by performing the adjustment at the time of maximum combustion and minimum combustion of the burner, it is possible to clarify the characteristics of the fan when the fan rotation speed is high and low, and therefore perform adjustment with high accuracy. be able to.
[0017]
Further, in the method for adjusting a combustion device according to the present invention, the storage means is a nonvolatile storage means, and when the lower limit current value is changed during the adjustment of the lower limit current value, the storage means is changed to the nonvolatile storage means. It is preferable to store the later lower limit current value. As the storage means, a volume using a variable resistor or the like can be used in addition to the nonvolatile storage means. However, by using the nonvolatile storage means, the door for adjusting the combustion equipment or the like is not opened. The value stored in the storage means can be changed. Therefore, since the lower limit current value can be adjusted in a state close to actual use, adjustment with high accuracy is possible.
[0018]
Further, when the combustion device includes an overheat detecting means for detecting the upper limit value of the combustion temperature and a blockage detecting means for detecting the blockage of the air passage, the overheat detecting means and It is preferable to release the operation of the blockage detecting means. If the fan is controlled with the lower limit current value when the burner is in a combustion state, the temperature of the combustion equipment temporarily rises, and the operation may be stopped by the overheat detection means. Further, when the fan is controlled with the lower limit current value, it may be determined that the filter blockage has progressed by the blockage detection means, and error processing may be performed. Therefore, during the inspection of the fan speed, the operation of these means is canceled by means such as changing the threshold values in the overheat detecting means and the blockage detecting means so that such operation stoppage and error processing are not performed. The lower limit current value is adjusted.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Next, an example of an embodiment of a method for adjusting a combustion device according to the present invention will be described with reference to FIGS. FIG. 1 is an explanatory diagram showing the configuration of a combustion device, FIG. 2 is a block diagram showing the electrical configuration of the combustion device, FIG. 3 is a flowchart showing a method for adjusting the combustion device of the first embodiment, and FIG. FIG. 5 is a flowchart showing an adjustment method according to the third embodiment of the present invention.
[0020]
First, the combustion equipment adjusted by the adjustment method of the first embodiment will be described using the gas fan heater FH as an example. As shown in FIG. 1, the gas fan heater FH includes a duct 2 (air passage), a blower fan 3, a gas burner 4, a duct 5 (air passage), a gas supply pipe 6, A control unit 7 is provided.
[0021]
The duct 2 constitutes a hot air blowing path, an intake port 8 for taking in indoor air s is opened in the back surface of the main body case 1, and a hot air outlet 9 is formed in the lower front portion of the main body case 1. It is open. An air filter 10 that prevents dust and dust from flowing into the duct 2 is detachably attached to the air inlet 8. The blower outlet 9 is provided with a movable louver 11 that adjusts the degree of opening thereof, and the movable louver 11 is driven by a gad motor 12. A room temperature sensor 13 composed of a thermistor is attached near the air inlet 8 inside the duct 2, and the room temperature sensor 13 outputs a signal corresponding to the room temperature to the control unit 7.
[0022]
The blower fan 3 includes a fan motor 14 whose rotational speed changes in proportion to the energization current, and a rotary blade 15 that is disposed in the duct 2 so as to face the air outlet 9 and is rotationally driven by the fan motor 14. The blower fan 3 sucks the indoor air s from the air inlet 8 into the duct 2 by the rotation of the rotary blade 15, mixes the sucked indoor air s with the combustion exhaust h of the gas burner 4 incorporated in the duct 2, It is blown into the room from the air outlet 9 as warm air m. A rotation speed sensor 16 for detecting the rotation speed is provided on the rotation shaft of the fan motor 14 of the blower fan 3.
[0023]
In the gas burner 4, a combustion plate 18 is disposed in a combustion cylinder 17 disposed in the duct 2, and an ignition electrode 19 is disposed on the downstream side of the combustion plate 18. A thermocouple 20 for detecting the presence or absence of a combustion flame is disposed downstream of the combustion plate 18. The duct 5 is a passage for supplying the room air s and the fuel gas to the gas burner 4, and has an air inlet 21 for the room air s opened at the back surface of the main body case 1. A nozzle 22 attached to the tip of the gas supply pipe 6 is provided at a location on the gas burner 4 side of the duct 5. The gas supply pipe 6 is provided with electromagnetic valves 24 and 25 and an electromagnetic proportional valve 26 in that order from the upstream side.
[0024]
An operation switch 27, a room temperature setting switch 28, and a filter lamp 29 are disposed on the outer surface of the main body case 1. The filter lamp 29 is turned on by energization control of the control unit 7 when the air flow rate during the rotation operation of the blower fan 3 is reduced to some extent compared to the normal case, such as when the air filter 10 is clogged. Then, the user is notified of the necessity of cleaning the air filter 10 by the lighting.
[0025]
The control unit 7 is configured by using a microcomputer or the like, and includes a combustion control unit 30, a fan control unit 31, an abnormality detection unit 32, and an EEPROM 33 which is a nonvolatile storage unit, as shown in FIG. ing. The combustion control unit 30 controls energization of the electromagnetic valves 24 and 25, the electromagnetic proportional valve 26 and the ignition electrode 19 of the gas supply pipe 6 in accordance with signals from the operation switch 27 and the room temperature setting switch 28 and controls the combustion of the gas burner 4. To do. The fan control unit 31 controls energization of the fan motor 14 and controls the rotation speed of the blower fan 3 by signals from the operation switch 27 and the room temperature setting switch 28. The EEPROM 33 stores data for performing control and the like in the combustion control unit 30, the fan control unit 31, and the abnormality detection unit 32.
[0026]
The operation control of the gas fan heater FH by the control unit 7 is performed as follows. The control unit 7 sets the load (speed) of the gas burner 4 by the combustion control unit 30 to set the room temperature set by the room temperature setting switch 28, and the rotation speed at which the combustion of the gas burner 4 is optimized by the fan control unit 31. The rotational speed of the fan motor 14 is controlled so that On the other hand, when the duct 2 or the duct 5 is closed due to clogging of the air filter 10 or the like due to long-term use of the gas fan heater FH, the load of the blower fan 3 for securing the target rotational speed of the fan motor 14 Decreases, the fan current supplied to the fan motor 14 decreases. When the target rotation speed cannot be secured unless the fan current falls below a predetermined lower limit current value, the fan control unit 31 rotates the fan motor 14 with the fan current fixed at the lower limit current value. To control the lower limit current value.
[0027]
As described above, when the lower limit current value control is performed by the fan control unit 31, the abnormality detection unit 32 determines that the air filter 10 is clogged and turns on the filter lamp 29 to prompt the user to perform the air filter. Encourage 10 cleaning. Accordingly, when the user cleans the air filter 10 and the blockage of the duct 2 or the duct 5 is resolved, the load of the blower fan 3 is increased. The fan motor 14 is driven with a current value such that becomes the target rotational speed.
[0028]
Next, the adjustment unit 34 that adjusts the gas fan heater FH will be described. As shown in FIG. 2, the adjustment unit 34 is detachably connected to the control unit 7 via a connector 35. The adjustment unit 34 is connected at the time of inspection in a combustion inspection area of a production line (not shown) of the gas fan heater FH described later, and is removed at the end of the inspection. The adjustment unit 34 includes an operation control unit 36, a comparison unit 37, a minimum current value correction unit 38, and an abnormality detection control unit 39.
[0029]
The operation control unit 36 operates the gas fan heater FH during the inspection operation when performing the combustion inspection by controlling the combustion control unit 30 and the fan control unit 31 during the combustion inspection. The comparison unit 37 compares the rotational speed of the fan motor 14 detected during the inspection operation with the target rotational speed necessary for normal combustion of the gas burner 4. The minimum current value correction unit 38 rewrites the data of the lower limit current value stored in the EEPROM 33 to the changed lower limit current value when the rotation speed of the fan motor 14 detected during the inspection operation is not in a normal range. The abnormality detection control unit 39 prevents the operation from being stopped due to the operation of the abnormality detection unit 32 of the control unit 7 during the inspection operation.
[0030]
Next, a process for inspecting the gas fan heater FH in the production line will be described with reference to FIG. The gas fan heater FH is assembled in an assembly area of a production line (not shown), and a combustion inspection after assembly is performed in the combustion inspection area. In the combustion inspection area, a connector 35 extending from the adjustment unit 34 is connected to the control unit 7 of the gas fan heater FH (STEP 1), and a gas pipe (not shown) is connected to the gas supply pipe 6.
[0031]
From this state, the inspection operation is started by the operation control unit 36 of the adjustment unit 34. First, the operation control unit 36 ignites the gas burner 4 through the combustion control unit 30 of the control unit 7 and controls the rotation of the blower fan 3 through the fan control unit 31 (STEP 2). Next, a signal from the abnormality detection control unit 39 of the adjustment unit 34 is transmitted to the abnormality detection unit 32 of the control unit 7, and the temperature threshold when the abnormality detection unit 32 performs the high temperature abnormality stop and the filter abnormality notification is changed. (STEP 3). This prevents a high temperature abnormal stop by the abnormality detection unit 32 during the inspection operation and prevents a filter abnormality notification.
[0032]
Next, the operation control unit 36 performs high-load operation of the gas burner 4 for a predetermined time (STEP 4). After the combustion is stabilized in the high load operation state, the fan current supplied to the fan motor 14 by the operation control unit 36 is set to the lower limit current value I during the high load operation.₁Then, lower limit current value control is performed (STEP 5). Then, the rotational speed sensor 14 detects the rotational speed of the fan motor 14 for a predetermined time, and the average rotational speed R during high load operation.₁Is detected. At this time, the ambient temperature T during high load operation is simultaneously measured by the room temperature sensor 13.₁Is measured (STEP 6).
[0033]
Next, the operation controller 36 performs a low load operation of the gas burner 4 for a predetermined time (STEP 7). After the combustion is stabilized in the low load operation state, the fan current supplied to the fan motor 14 by the operation control unit 36 is set to the lower limit current value I in the low load operation.₂Then, lower limit current value control is performed (STEP 8). As in the high load operation, the rotation speed sensor 14 detects the rotation speed of the fan motor 14 for a predetermined time, and the average rotation speed R in the low load operation is detected.₂And the ambient temperature T during low load operation is detected by the room temperature sensor 13.₂Is measured (STEP 9).
[0034]
Next, the detected rotational speed R detected during the low load operation and the high load operation in the comparison unit 37.₂, R₁And N which is the rotational speed region necessary for normal combustion of the gas burner 4_a, N_bAnd compare. Detected rotation speed R during low load operation₂Is the target rotation area N during low-load operation_aAnd the detected rotational speed R during high load operation.₁Is the target rotation area N during high-load operation_b(YES in STEPs 10 and 11), it is determined that the gas fan heater FH is normal, and the adjustment ends. When the adjustment is completed in this way and the adjustment unit 34 is removed from the gas fan heater FH, the temperature threshold value when the abnormality detection unit 32 performs the high temperature abnormality stop and the filter abnormality notification is returned to the normally set threshold value. .
[0035]
On the other hand, the detected rotational speed R during low-load operation₂Is the target rotation area N during low-load operation_aIs not included (NO in STEP 10) or the detected rotational speed R during high-load operation₁Is the target rotational speed N during high-load operation_bIs not included (NO in STEP 11), the lower limit current value is corrected as follows. First, the detected rotational speed R during low load operation₂Is the target rotation area N during low-load operation_aIf not included (NO in STEP 10), the detected rotational speed R₂And the target rotational speed R calculated by Equation (1)_AAnd compare. This target rotational speed R_AIs the reference rotational speed at the initial value of the lower limit current value R_aThe temperature compensation is performed at the temperature detected by the room temperature sensor 13.
[0036]
[Expression 1]
R_A= R_a+ K (T₂−20) + A (1)
[0037]
Here, K is a coefficient depending on the power supply frequency and motor torque characteristics, and A is an adjustment correction value determined by the model and the like. The target rotational speed R thus obtained_AAnd detection speed R₂Correction value is obtained corresponding to the difference between the lower limit current value I before correction_aThe lower limit current value I after addition and subtraction_ThreeIs determined (STEP 12). In the first embodiment, the larger the difference between the two, the lower limit current value I_aThe correction value to be added to or subtracted from is increased.
[0038]
As described above, when the lower limit current value is corrected, the minimum current value correction unit 38 of the adjustment unit 34 is changed to the EEPROM 33 of the control unit 7._FourIs written (STEP 13). And the lower limit current value I changed again_FourThe rotational speed of the fan motor 14 is inspected (STEP 14), and the rotational speed of the fan motor 14 is reduced to the target rotational range N during low load operation._aIf it is included (YES in STEP 15), the inspection is terminated. At this time, the rotational speed of the fan motor 14 is equal to the target rotational area N._aIf it is not included, it is expected that there is some cause of failure, so that it is excluded from the inspection area of the production line and error processing is performed.
[0039]
On the other hand, the detected rotational speed R during high load operation₁Is the target rotation area N during high-load operation_bIs not included (NO in STEP 11), the target rotational speed RB and the detected rotational speed R obtained in the same manner as in the low load operation.₁I is the lower limit current value after correction according to the difference._Three(STEP 16). Then, the minimum current value correction unit 38 is changed to the EEPROM 33, and the lower limit current value I_Three(STEP 17), lower limit current value I_ThreeThen, the rotational speed of the fan motor 14 is inspected (STEP 18). If the rotational speed of the fan motor 14 is included in the target rotational area during high load operation (YES in STEP 19), the inspection is terminated.
[0040]
Since the adjustment method of the combustion apparatus of 1st Embodiment adjusts in the state which burned the gas burner 4 as mentioned above, accuracy becomes high compared with the case where the gas burner 4 is not burned. Further, since the number of rotations of the fan motor 14 at the lower limit current value is inspected during low load operation and high load operation, the characteristics of the fan motor 14 can be accurately grasped. For this reason, even when the duct 2 or the duct 5 is blocked due to clogging of the air filter 10 or the like, normal combustion of the gas burner 4 can be ensured from a high load to a low load.
[0041]
Next, the adjustment method of the combustion equipment which is the 2nd Embodiment of this invention is demonstrated. The gas fan heater FH to be adjusted in the second embodiment and the adjustment unit 34 to be adjusted are the same as those in the above embodiment, and thus detailed description thereof is omitted.
[0042]
In the adjustment method of the gas fan heater FH in the second embodiment, first, in the fan motor 14 used in the gas fan heater FH, the rotation speed at the design value when the fan current is set to the lower limit current value is set as the reference rotation speed. . In the second embodiment, the reference rotational speed during high load operation is R_Three, R is the reference speed during low load operation_FourIt is said. Next, as in the first embodiment, a connector 35 extending from the adjustment unit 34 in the combustion inspection area is connected to the control unit 7 of the gas fan heater FH (STEP 21), and is not shown in the gas supply pipe 6. Connect the gas pipe. Further, the inspection operation is started by the operation control unit 36 of the adjustment unit 34 as in the above embodiment (STEPs 22 and 23).
[0043]
Next, the operation control unit 36 performs high-load operation of the gas burner 4 for a predetermined time (STEP 24). After the combustion is stabilized in the high load operation state, the operation control unit 36 sets the rotation speed of the fan motor 14 to the reference rotation speed R during the high load operation._ThreeThe operation is performed so as to become (STEP 25). At this time, the fan motor 14 is moved to the reference rotational speed R by the minimum current value correction unit 38._ThreeBecomes the new lower limit current value I_Three(STEP 26). Then, the minimum current value correction unit 38 of the adjustment unit 34 is changed to the EEPROM 33 of the control unit 7 so that the lower limit current value I is changed._ThreeIs written (STEP 27).
[0044]
Next, the operation control unit 36 performs the low load operation of the gas burner 4 for a predetermined time (STEP 28). After the combustion is stabilized in the low load operation state, the operation control unit 36 sets the rotation speed of the fan motor 14 to the reference rotation speed R during the low load operation._FourThe operation is performed so as to become (STEP 29). At this time, the minimum current value correction unit 38 sets the lower limit current value to I_Four(STEP 30) is written in the EEPROM 33 (STEP 31).
[0045]
As described above, according to the adjustment method of the second embodiment, the fan motor 14 is operated at the reference rotational speed R in a state where the gas fan heater FH is actually operated by the above-described process._ThreeAnd R_FourAnd the fan current at that time is a new lower limit current value I_ThreeAnd I_FourIt is said. Therefore, even if there is an individual difference in the fan motor 14 or the like, the fan motor 14 is not rotated at the reference rotational speed R in the lower limit current value control._ThreeAnd R_FourTherefore, even if the duct 2 or the duct 5 is closed, normal combustion of the gas burner 4 can be ensured from a high load to a low load.
[0046]
Next, a third embodiment of the present invention will be described with reference to FIG. The gas fan heater FH that is adjusted in the third embodiment and the adjustment unit 34 that performs the adjustment are the same as those in the first embodiment, and a detailed description thereof will be omitted.
[0047]
In the adjustment method of the gas fan heater FH in the third embodiment, first, in the fan motor 14 used in the gas fan heater FH, the rotation speed at the design value when the fan current is set to the lower limit current value is set as the reference rotation speed. . In the third embodiment, the reference rotational speed during high load operation is R_Three, R is the reference speed during low load operation_FourIt is said. Next, as in the first embodiment, a connector 35 extending from the adjustment unit 34 in the combustion inspection area is connected to the control unit 7 of the gas fan heater FH (STEP 41), and not shown in the gas supply pipe 6. Connect the gas pipe. Further, the inspection operation is started by the operation control unit 36 of the adjustment unit 34 as in the above embodiment (STEPs 42 and 43).
[0048]
Next, the operation control unit 36 performs high-load operation of the gas burner 4 for a predetermined time (STEP 44). After the combustion is stabilized in the high load operation state, the operation control unit 36 sets the rotation speed of the fan motor 14 to the reference rotation speed R when the load is high._Three(STEP 45) and the fan current value I at that time_ThreeIs measured (STEP 46).
[0049]
Next, the operation controller 36 performs the low load operation of the gas burner 4 for a predetermined time (STEP 47). After the combustion is stabilized in the low load operation state, the operation control unit 36 sets the rotation speed of the fan motor 14 to the reference rotation speed R when the load is low._Four(STEP 48) and the fan current value I at that time_FourIs measured (STEP 49).
[0050]
Next, the fan current value I detected at the time of low load operation and high load operation in the comparison unit 37._Four, I_ThreeAnd N which is an allowable range of each fan current value_d, N_cAnd compare. Fan current value I at low load operation_FourIs the allowable range of fan current value during low-load operation_dFan current value I during high load operation_ThreeIs the allowable range of fan current value during high load operation_c(YES in STEPs 50 and 51), it is determined that the gas fan heater FH is normal, and the adjustment ends.
[0051]
  On the other hand, the fan current value I during low load operation_FourN is an acceptable range_dIs not included (NO in STEP50), the lower limit current value at low load isTolerance range N _d Fan current value after change, which is the intermediate valueChange to Similarly, fan current value I during high load operation_ThreeN is an acceptable range_cIs not included (NO in STEP 51), the lower limit current value at high load isTolerance range N _c Fan current value after change, which is the intermediate valueChange to
[0052]
As described above, when the lower limit current value is changed, the lowest current value correction unit 38 of the adjustment unit 34 writes the changed lower limit current value in the EEPROM 33 of the control unit 7 (STEP 52). Further, the lower limit current value is adjusted in the same manner as described above for the fan current value during high load operation (STEP 53).
[0053]
In each of the above embodiments, the adjustment unit 34 is connected to the control unit 7 of the gas fan heater FH via the connector 35. However, the present invention is not limited to this, and the control unit 7 includes a remote control transmission / reception circuit and the like. If it exists, you may perform operation control at the time of test | inspection driving | operation, writing of EEPROM, etc. wirelessly via the said transmission / reception circuit. In the second and third embodiments, the room temperature may be detected when the lower limit current value is detected as in the first embodiment, and temperature compensation may be performed in accordance with the temperature characteristics of the fan motor 14. Also in the second and third embodiments, similarly to the first embodiment, the lower limit current value control is performed at the changed lower limit current value, and the fan speed at that time is within a predetermined allowable range. You may check whether or not.
[0054]
Moreover, in each said embodiment, although the gas fan heater was demonstrated to the example as a combustion apparatus, it will be used for adjustment of a water heater etc. if not only this but the burner, the air passage, and the fan are provided. May be.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing the configuration of a combustion device.
FIG. 2 is a block diagram showing an electrical configuration of a combustion device.
FIG. 3 is a flowchart illustrating an adjustment method according to the first embodiment.
FIG. 4 is a flowchart illustrating an adjustment method according to the second embodiment.
FIG. 5 is a flowchart illustrating an adjustment method according to the third embodiment.
[Explanation of symbols]
FH: Gas fan heater (combustion equipment), 2 ... Duct (air passage), 3 ... Blower fan, 4 ... Gas burner, 5 ... Duct (air passage), 31 ... Fan control unit, 33 ... EEPROM (storage means).

Claims (6)

A fan that is provided in an air passage having a built-in burner and supplies combustion air to the burner, and a fan control unit that controls the fan current so that the fan speed matches a target speed corresponding to the amount of combustion of the burner And the fan control means maintains the fan current at the lower limit current value when the fan current decreases due to the degree of blockage of the air passage and becomes less than or equal to the lower limit current value stored in the storage means. A method for adjusting a combustion device for performing
A method for adjusting a combustion apparatus, comprising: adjusting the lower limit current value so that a rotation speed of the fan is within a predetermined allowable range when the lower limit current value control is performed by the fan control means.   In the adjustment of the lower limit current value, the fan control means controls the fan current to the lower limit current value, and checks whether the fan rotation speed is within a predetermined allowable range, and the fan rotation speed exceeds the allowable range. 2. The method of adjusting a combustion device according to claim 1, wherein the lower limit current value is changed so that the fan rotational speed falls within an allowable range.   In the adjustment of the lower limit current value, a reference rotation speed serving as a reference within the allowable range of the fan rotation speed is determined in advance, and the fan current is adjusted so that the fan rotation speed becomes the reference rotation speed by the fan control means. 2. The method of adjusting a combustion device according to claim 1, wherein the fan current is controlled so that the fan current at which the fan reaches the reference rotational speed is set as a new lower limit current value. 3. The method for adjusting a combustion device according to any one of claims 1 to 3 , wherein the lower limit current value is adjusted during maximum combustion and minimum combustion of the burner. The storage means is a nonvolatile storage means, and when the lower limit current value is changed during adjustment of the lower limit current value, the changed lower limit current value is stored in the nonvolatile storage means. The method for adjusting a combustion device according to any one of claims 1 to 4 . The combustion device includes an overheat detecting means for detecting an upper limit value of a combustion temperature and an obstruction detecting means for detecting an obstruction of the air passage, and the overheat detecting means and the operation of the obstruction detecting means are performed when the lower limit current value is adjusted. The method for adjusting a combustion device according to any one of claims 1 to 5 , wherein: is canceled.

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