JP5951665B2 - Combustion equipment - Google Patents

Description

  The present invention relates to a combustion apparatus that supplies combustion air to a burner by a fan.

  Conventionally, in a combustion apparatus in which combustion air is supplied to a burner by a fan such as a gas water heater or a gas hot air heater, a filter is provided at the air supply port in order to prevent dust in the air from flowing into the burner. (See, for example, Patent Document 1).

  Here, the rotation speed of the fan during burner combustion is set based on the supply amount of combustion air necessary for burning the burner, but the fan is operated at a predetermined rotation speed as the filter clogging progresses. In this case, the supply amount of combustion air gradually decreases. In this case, if the fan is operated at a rotational speed set assuming that the filter is not clogged, the supply amount of combustion air will be insufficient. Therefore, a combustion apparatus has been proposed in which the degree of filter clogging is detected and correction is performed to increase the rotational speed of the fan in accordance with the degree of clogging (see, for example, Patent Document 2).

  The correction value of the fan corresponding to the degree of filter clogging is stored in the storage means, and when the burner starts combustion, the rotation speed of the fan is set using the correction value stored in the storage means. When the air supply filter has been cleaned and clogging has been resolved while combustion is stopped, the rotation speed of the fan using the correction value stored in the storage means (correction value when filter clogging has occurred) If is set, the supply of combustion air becomes excessive, and there is a risk of poor burner combustion.

  Therefore, in the combustion apparatus described in Patent Literature 2, before the burner is ignited, the correction value stored in the storage means is larger than the cleaning reference value (a reference value indicating a level at which the filter needs to be cleaned). If the correction value stored in the storage means is larger than the cleaning reference value, it is determined that there is a high possibility that the air supply filter has been cleaned while the burner has stopped burning, and the fan The correction value is reset.

JP-A-11-182837 JP-A-9-96416

  In the combustion apparatus described in Patent Document 2, when it is recognized that the correction value stored in the storage means is larger than the cleaning reference value before the burner is ignited, the fan is set at a predetermined initial rotational speed. After operating for a period of 7 seconds to stabilize the fan speed, update the correction value (fan correction value) to eliminate the clogging of the filter based on the energization amount of the fan. ing. Therefore, there is a disadvantage that the waiting time until the burner is ignited becomes longer and the start of the combustion operation is delayed.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a combustion apparatus that prevents the start of combustion operation from being delayed in order to update the correction value of the fan that accompanies the replacement of the air inlet filter. And

The present invention has been made to achieve the above object, and the combustion apparatus of the present invention comprises:
A burner communicating with the air supply passage;
A fan for supplying combustion air to the burner via the air supply passage;
A filter that is detachably attached to the air supply port of the air supply passage and is removed from the air supply port during cleaning;
A filter detection unit for detecting whether or not the filter is attached to the air supply port;
Correction value calculation that calculates a fan correction value that is a correction value for correcting the rotation speed of the fan according to the degree of clogging of the filter based on the relationship between the rotation speed of the fan and the energization amount of the fan And
A storage unit for holding the fan correction value;
A filter desorption detection unit that detects the presence or absence of desorption of the filter by the filter detection unit during the combustion stop of the burner;
The combustion operation of the burner is performed by operating the fan at a corrected rotational speed obtained by correcting a target rotational speed corresponding to the target combustion amount of the burner with a fan correction value held in the storage unit, A combustion control unit that calculates a fan correction value by the correction value calculation unit at the time of execution and updates the fan correction value held in the storage unit according to the calculated fan correction value;
When the combustion operation is started by the combustion control unit, whether or not a determination condition including a condition that the filter desorption detection unit detects desorption of the filter is established before the burner is ignited. When the determination condition is satisfied, the fan is operated, the current fan correction value is calculated by the correction value calculation unit, and the calculated fan correction value is equal to or lower than a first predetermined level. As a condition, the fan correction value stored in the storage unit is updated to a fan correction value corresponding to the degree of clogging of the filter being equal to or lower than the first predetermined level, and the determination condition is satisfied. When not, a filter cleaning countermeasure unit that maintains the fan correction value held in the storage unit is provided.

  According to the present invention, the filter is removed from the air supply port during cleaning, and the filter removal detection unit detects that the filter has been removed. When the filter is cleaned, it is necessary to update the fan correction value held in the storage unit to a value corresponding to a state where the filter is not clogged.

  Therefore, when the start of combustion operation of the burner is instructed by the operation start instructing unit, the filter demounting detection unit detects the desorption of the filter before the ignition of the burner. It is determined whether or not the determination condition is satisfied.

  When this determination condition is satisfied, it can be determined that the filter has been clogged during the previous combustion operation, and it is highly likely that the filter has been removed and cleaned during the stop of the combustion operation. Therefore, when the determination condition is satisfied, the filter cleaning countermeasure unit calculates a current fan correction value, and the current fan correction value indicates that the degree of clogging of the fan is not more than a first predetermined level. The fan correction value held in the storage unit is updated to a corresponding fan correction value when the degree of filter clogging is equal to or lower than the first predetermined level.

  Further, when the determination condition is not satisfied, it can be determined that the filter is not cleaned, and therefore the filter cleaning countermeasure unit maintains the fan correction value held in the storage unit.

  As described above, according to the present invention, when the determination condition is not satisfied, it is determined that the filter is not cleaned, and the burner can be promptly updated without performing the filter correction value update process. Can be ignited to start the combustion operation. Further, the calculation of the filter correction value at the present time performed when the determination condition is satisfied is for confirming that the filter clogging has been eliminated. Unlike the described configuration, it is not necessary to set a long stabilization time for the rotation speed of the fan in order to update the fan correction value. Therefore, the filter correction value update process can be quickly performed to ignite the burner and start the combustion operation.

  Further, as the determination condition, the fan correction value held in the storage unit indicates that the filter is clogged at a second predetermined level or higher that is higher than the first predetermined level, and the filter removal detection The condition that the attachment / detachment of the filter is detected by the unit is set.

  According to this configuration, by adding a condition that the fan correction value held in the storage unit indicates that the filter is clogged at the second predetermined level or more, the determination condition includes: When the filter is removed for purposes other than cleaning, the fan correction value is not updated, and the burner can be quickly ignited to start the combustion operation.

Explanatory drawing of the attachment aspect of the filter of the water heater which is a combustion apparatus of this invention. Explanatory drawing of the control system of the water heater shown in FIG. The graph which shows the relationship between the rotational speed of a fan, and the energization amount of a motor. The graph which shows the relationship between the clogging degree of a filter, and a fan correction value. The flowchart of the controller at the time of the hot water supply operation start. The flowchart of the change process of the fan correction value during hot water supply driving | operation. The flowchart of the process which detects removal of the filter in hot water supply operation stop.

  An embodiment of the present invention will be described with reference to FIGS.

  Referring to FIG. 1, a water heater 1 (corresponding to a combustion apparatus of the present invention) of the present embodiment is disposed in a housing 10 above a burner 50 and a burner 50 described later with reference to FIG. 2. The heat exchanger 41 and the controller 30 for controlling the operation of the water heater 1 are accommodated. The water heater 1 heats the water supplied from the water supply to the heat exchanger 41 through the water passage and discharges the hot water.

  A front panel 11 is attached to the front opening of the housing 10, and an operation panel 16 is attached to the lower left side of the front panel 11. An air supply port 12 (not shown) communicating with the burner 50 is provided on the lower right side of the front panel 11, and the filter 20 is detachably attached to the air supply port 12. The filter 20 is desorbed during cleaning.

  The filter 20 is formed by attaching a mesh-shaped filter material 22 to a frame-shaped member 21, and a protrusion 23 is formed on the rear surface of the frame-shaped member 21. A filter switch 15 (corresponding to a filter detection unit of the present invention) that detects that the filter 20 is attached to the air supply port 12 is provided in the housing 10.

  When the filter 20 is attached to the air supply port 12, the protrusion 23 of the filter 20 passes through the through hole 14 and presses the lever portion 15 a of the filter switch 15. Since the contact (not shown) of the filter switch 15 is turned ON (conducting state) by this pressing, whether the filter 20 is attached to the air inlet 12 by recognizing the ON / OFF (interrupted state) of the contact. Can be detected.

  Next, referring to FIG. 2, the water heater 1 includes a water passage 40 having an upstream side connected to a water supply (not shown) and a currant 45 connected to a downstream side, and heat provided in the middle of the water passage 40. An exchanger 41, a flow sensor 42 that detects the flow rate of water flowing through the water passage 40, a hot water supply temperature sensor 43 that detects the temperature of hot water discharged from the water passage 40, and a water passage provided below the heat exchanger 41. The burner 50 which heats the water which distribute | circulates 40 is provided.

  A gas supply passage 51 that is connected to the burner 50 and supplies fuel gas to the burner 50 is provided with a gas main valve 53 that opens and closes the gas supply passage 51 and a gas proportional valve 52 that changes the opening of the gas supply passage 51. ing. A flame rod 55 for detecting the combustion flame of the burner 50 and a spark plug 54 for igniting the burner 50 are provided in the vicinity of the burner 50.

  Further, the water heater 1 includes a fan 60 for supplying combustion air to the burner 50 and a controller 30. The fan 60 rotationally drives the rotary blade 62 by a motor 61, and includes a speed sensor 63 that detects the rotational speed of the motor 61 and a current sensor 64 that detects the amount of current (energization amount) flowing through the motor 61. ing.

  The controller 30 is an electronic circuit unit including a CPU, a memory 36 (corresponding to a storage unit of the present invention), an interface circuit, and the like, and executes a control program for the water heater 1 held in the memory 36 by the CPU. By this, it functions as the correction value calculation part 31, the filter desorption detection part 32, the combustion control part 33, and the filter cleaning countermeasure part 34.

  Detection signals from the filter switch 15, the flow sensor 42, the hot water temperature sensor 43, the frame rod 55, the speed sensor 63, and the current sensor 64 are input to the controller 30. Further, the operation of the gas proportional valve 52, the gas main valve 53, the spark plug 54, and the fan 60 is controlled by a control signal output from the controller 30.

  The controller 30 is connected to the operation panel 16, and a detection signal of an operation state of switches provided on the operation panel 16 is input to the controller 30. Further, the display state of the display unit 71 provided on the operation panel 16 is controlled by a control signal output from the controller 30 to the operation panel 16.

  The controller 30 switches between an operation state and a standby state in accordance with an operation of the operation switch 72 provided on the operation panel 16. In the operation state, when the curan 45 is opened and water is supplied from the water supply to the water passage 40, a hot water supply operation is performed in which the burner 50 is burned to supply hot water to the curan 45. In the standby state, the hot water supply operation is not executed even if the currant 45 is opened.

  The combustion control unit 33 starts a hot water supply operation (corresponding to the combustion operation of the present invention) when the flow rate detected by the flow sensor 42 shifts from a state lower than the minimum flow rate to a state higher than the minimum flow rate in the operation state. To do.

  The combustion control unit 33 determines the target combustion amount of the burner so that the detected temperature of the hot water supply temperature sensor 43 becomes the target hot water supply temperature set by the temperature switch 73 of the operation panel 16. The combustion control unit 33 determines the target opening of the gas proportional valve 52 and the target rotational speed of the fan 60 according to the target combustion amount, and controls the opening of the gas proportional valve 52 to the target opening. The rotational speed of 60 is controlled to the target rotational speed.

  Here, the target rotation speed is set under conditions where the filter 20 is not clogged. For this reason, when the clogging of the filter 20 progresses, the supply of combustion air to the burner 50 becomes insufficient when the fan 60 is rotationally driven at the target rotational speed.

  Therefore, the correction value calculation unit 31 calculates a fan correction value Id that is a correction value for correcting the target rotational speed of the fan 60 according to the degree of clogging of the filter 20. The correction value calculation unit 31 performs filtering based on the relationship between the rotational speed Nx of the motor 61 of the fan 60 (detected by the speed sensor 63) and the energization amount Ix (detected by the current sensor 64) of the motor 61. A degree of clogging of 20 is detected.

Here, FIG. 3 shows the relationship between the rotational speed Nx of the motor 61 and the energization amount Ix, with the vertical axis representing the energization current Ix and the horizontal axis representing the rotational speed Nx. Correction value calculation unit 31 may utilize a standard line L ₁ showing the relationship between the rotational speed Nx when the clogging of the filter 20 does not occur with the energization amount Ix, an auxiliary line L _2, the rotational speed of each line The energization amounts Ia and Ib at Nx are obtained.

  Then, the correction value calculation unit 31 calculates the fan correction value Id by substituting Ia, Ib and the energization amount Ix detected by the current sensor 64 into the following equation (1).

  Where α is an experimentally determined constant of 1 or less.

  The relationship between the rotational speed Nx of the fan 60 and the energization amount Ix shown in the graph of FIG. 3 is stored in the memory 36 in advance in the form of a table or a relational expression.

  The fan correction value Id indicates a tendency of the degree of clogging of the filter 20, and the relationship between the fan correction value Id and the degree of clogging of the filter 20 is as shown in FIG. FIG. 4 shows the relationship between the fan correction value Id and the degree of clogging, where the vertical axis is the fan correction value Id and the horizontal axis is the degree of clogging of the filter 20. For example, Id is 1.2. If there is, it is determined that the degree of clogging of the filter 20 is 80%.

  The combustion controller 33 calculates the fan correction value Id by the correction value calculator 31 during execution of the hot water supply operation, and updates the fan correction value Id held in the memory 36 according to the calculated fan correction value Id. Hereinafter, the fan correction value Id held in the memory 36 is referred to as a holding correction value IdH, and the current fan correction value Id calculated by the correction value calculation unit 31 is referred to as a necessary correction value IdN. When the combustion operation is performed, the combustion control unit 33 multiplies the target rotation speed by the holding correction value IdH held in the memory 36, thereby correcting the correction rotation speed to compensate for the shortage of the supply amount of combustion air due to clogging of the filter 20. The fan 60 is operated at the corrected rotational speed.

  Next, according to the flowcharts shown in FIGS. 5 to 7, processing for dealing with a case where the filter 20 is mainly cleaned and the clogging of the filter 20 is eliminated will be described. The controller 30 executes the processing according to the flowcharts of FIGS.

  When the detected flow rate of the flow rate sensor 42 in STEP 1 is equal to or higher than the minimum flow rate, the controller 30 starts the hot water supply operation in STEP 10 and before the burner 50 is ignited, STEP 2 to STEP 9, STEP 30, STEP 40 to 42, STEP 45. This process is executed by the filter cleaning countermeasure unit 34.

  The filter cleaning countermeasure unit 34 operates the fan 60 at the clogging detection rotation speed at STEP2, and determines whether the filter switch 15 is ON at subsequent STEP3. When the filter switch 15 is ON (a state in which the filter 20 is attached), the process proceeds to STEP4.

  On the other hand, when the filter switch 15 is OFF (a state in which the filter 20 is not attached), the process proceeds to STEP 30 to stop abnormally due to the filter being removed. In this case, the controller 30 performs an abnormal display on the display unit 71 of the operation panel 16.

  In STEP 4, the filter cleaning countermeasure unit 34 determines whether or not the holding correction value IdH held in the memory 36 (the holding correction value IdH updated when the previous hot water supply operation is executed) is 1.3 or more. Here, 1.3 is a threshold value for determining that clogging of the filter 20 has progressed and the degree of clogging is at a level that requires cleaning of the filter 20 (corresponding to the second predetermined level of the present invention). It is.

  When the holding correction value IdH is smaller than 1.3, since the possibility that the filter 20 has been cleaned is low, the routine proceeds to STEP 10, the ignition control of the burner 50 is executed by the combustion control unit 33, and the hot water supply operation is started. In this case, the holding correction value IdH held in the memory 36 is maintained without being updated.

  On the other hand, when the holding correction value IdH is 1.3 or more, there is a possibility that the filter 20 has been cleaned. Therefore, the process proceeds to STEP5, where the filter cleaning handling unit 34 sets the filter removal flag ("filter" in FIGS. 5 and 7). It is determined whether or not (denoted as “F”) is 1 (set).

  Here, since it is necessary to remove the filter 20 from the air supply port 12 when cleaning the filter 20, the filter switch 15 is always in the OFF state when the user or the maintenance worker cleans the filter 20.

  Therefore, when the hot water supply operation is stopped (when the combustion of the burner 50 is stopped), the filter attachment / detachment detection unit 32 performs the process according to the flowchart shown in FIG. 7 and monitors the removal of the filter 20. The filter attachment / detachment detection unit 32 determines whether or not the hot water supply operation is stopped in STEP 70 of FIG. 7. When the hot water supply operation is stopped, the process proceeds to STEP 71 and determines whether or not the filter switch 15 is OFF. To do.

  When the filter switch is OFF (when the filter 20 is removed from the air inlet 12), the process proceeds to STEP 72, and the filter desorption detection unit 32 sets the filter demounting flag to 1 (set) and proceeds to STEP 73. The process is terminated. The filter removal flag is set to 1 when the filter 20 is removed while the hot water supply operation is stopped by the processing of the filter attachment / detachment detection unit 32.

  Returning to the flowchart of FIG. 5, when the filter removal flag is 1 in STEP 5 (when it is detected that the filter 20 has been removed), the filter cleaning handling unit 34 proceeds to STEP 6.

  Then, the filter cleaning coping part 34 is in a state in which the rotational speed of the motor 61 is stabilized to some extent by the passage of the stabilization time of 2 seconds in STEP 6, and in the subsequent STEP 7, the rotational speed Nx of the motor 61 detected by the speed sensor 63, Applying the energization amount Ix of the motor 61 detected by the current sensor 64 to the graph of FIG. 4 as described above, the necessary correction value IdN is calculated by the above equation (1).

  Next, in STEP 8, the filter cleaning countermeasure unit 34 determines whether the necessary correction value IdN is 1.1 or less. Here, 1.1 is for determining that the clogging of the filter 20 has been eliminated, and the level corresponding to the state in which the clogging degree is cleaned (corresponding to the first predetermined level of the present invention). ).

  In STEP 8, when the necessary correction value IdN is 1.1 or less, it can be determined that the filter 20 has been cleaned. Therefore, the process proceeds to STEP 9, and the filter cleaning handling unit 34 sets the holding correction value IdH held in the memory 36. It is updated to 1.0 (initial value corresponding to a state where the filter 20 is not clogged).

  Then, the process proceeds to STEP 9, and the hot water supply operation is started by the combustion control unit 33. In STEP 11, the filter removal flag is set to 0 (reset), and the process proceeds to STEP 12 in FIG. On the other hand, if the necessary correction value IdN is larger than 1.1 in STEP8, the process branches to STEP42.

  Note that the holding correction value IdH held in the memory 36 may be updated to the necessary correction value IdN by the filter cleaning countermeasure unit 34.

  On the other hand, when the filter removal flag is not 1 in STEP 5, it can be determined that the filter 20 is not cleaned because the filter 20 has not been removed. Therefore, in this case, the process branches to STEP 40, and the filter cleaning countermeasure unit 34 calculates the necessary correction value IdN after waiting for the stabilization time of 2 seconds.

  Then, it is determined whether the necessary correction value IdN is 1.6 or less. Here, 1.6 is for determining the level at which the clogging of the filter 20 has progressed to such an extent that it is difficult to normally burn the burner 50 even if the target rotational speed is corrected by the holding correction value IdH. Is the threshold value.

  Therefore, when the necessary correction value IdN is larger than 1.6, the process branches to STEP 45, and the filter cleaning countermeasure unit 34 displays on the display unit of the operation panel 16 that the blockage error has been stopped, and stops the hot water supply operation. To do. On the other hand, when the necessary correction value IdN is 1.6 or less, the process proceeds to STEP 10 and the hot water supply operation is started by the combustion control unit 33.

  According to the flowchart shown in FIG. 5, whether or not the filter 20 has been cleaned is determined as follows: (1) The holding correction value IdH updated during the previous hot water supply operation is 1.3 or more (the filter 20 is clogged). And the filter removal flag is 1 (the filter 20 has been removed while the hot water supply operation is stopped).

  Then, since the determination based on the determination condition is performed, accuracy is not required so much in the confirmation of the actual clogging degree by the necessary correction value IdN in STEP8 and STEP42 after the determination. Therefore, the stabilization time of STEP 6 and STEP 40 is short, and the waiting time until the hot water supply operation is started in STEP 10 after the start condition of the hot water supply operation is established in STEP 1 can be shortened.

  The flowchart of FIG. 6 is a process for updating the holding correction value IdH during the hot water supply operation. The controller 30 repeatedly executes the processing of STEP12 to STEP17 during execution of the hot water supply operation.

  In STEP 12, the controller 30 calculates the necessary correction value IdN by the correction value calculation unit 31. In subsequent STEP 13, the controller 30 determines whether or not the necessary correction value IdN is larger than the held correction value IdH held in the memory 36.

  When the necessary correction value IdN is larger than the holding correction value IdH, the process branches to STEP50, where the controller 30 updates the holding correction value IdH by 0.01, and proceeds to STEP16. On the other hand, when the necessary correction value IdN is equal to or smaller than the holding correction value IdH, the process proceeds to STEP 14 and the controller 30 determines whether or not the necessary correction value IdN is equal to the holding correction value IdH.

  When the necessary correction value IdN is equal to the holding correction value IdH, the process branches to STEP17. In this case, the holding correction value IdH is not updated. On the other hand, when the necessary correction value IdN is not equal to the holding correction value IdH (in this case, the necessary correction value IdN is smaller than the holding correction value IdH), the process proceeds to STEP 15 and the controller 30 determines that the holding correction value IdH. Is updated by 0.01, and the process proceeds to STEP16.

  In STEP 16, the controller 30 determines whether or not the holding correction value IdH is 1.6 or less. As described above, 1.6 indicates a level at which the clogging of the filter 20 has progressed to such an extent that it is difficult to normally burn the burner 50 even if the target rotation speed is corrected by the holding correction value IdH. This is a threshold value for determination.

  Therefore, when the holding correction value IdH is larger than 1.6, the process branches to STEP 60, and the controller 30 displays on the display unit 71 of the operation panel 16 that the blockage error has been stopped, and stops the hot water supply operation. On the other hand, when the necessary correction value IdN is 1.6 or less, the process proceeds to STEP 17 and the controller 30 determines whether or not the detected flow rate of the flow sensor 42 is equal to or higher than the minimum flow rate.

  When the detected flow rate of the flow rate sensor 42 is equal to or higher than the minimum flow rate, the hot water supply operation is continued, so the process returns to STEP 12 and the controller 30 executes the processing from STEP 12 onwards. On the other hand, when the detected flow rate of the flow rate sensor 42 is less than the minimum flow rate, the process proceeds to STEP 18 and the controller 30 ends the hot water supply operation.

  In the present embodiment, the water heater 1 is shown as the combustion apparatus of the present invention. However, the combustion is performed by supplying the combustion air taken in from the air supply port equipped with the filter to the burner by a fan such as a warm air heater. The present invention can be applied to any combustion apparatus having a configuration in which the filter is cleaned by removing the filter from the air supply port.

  DESCRIPTION OF SYMBOLS 1 ... Hot water heater (combustion apparatus), 10 ... Housing, 12 ... Air supply port, 15 ... Filter switch (filter detection part), 16 ... Operation panel, 20 ... Filter, 30 ... Controller, 31 ... Correction value calculation part, 32 ... Filter attachment / detachment detection unit, 33 ... Combustion control unit, 34 ... Filter cleaning countermeasure unit, 36 ... Memory (storage unit), 50 ... Burner, 60 ... Fan.

Claims (2)

A burner communicating with the air supply passage;
A fan for supplying combustion air to the burner via the air supply passage;
A filter that is detachably attached to the air supply port of the air supply passage and is removed from the air supply port during cleaning;
A filter detection unit for detecting whether or not the filter is attached to the air supply port;
Correction value calculation that calculates a fan correction value that is a correction value for correcting the rotation speed of the fan according to the degree of clogging of the filter based on the relationship between the rotation speed of the fan and the energization amount of the fan And
A storage unit for holding the fan correction value;
A filter desorption detection unit that detects the presence or absence of desorption of the filter by the filter detection unit during the combustion stop of the burner;
The combustion operation of the burner is performed by operating the fan at a corrected rotational speed obtained by correcting a target rotational speed corresponding to the target combustion amount of the burner with a fan correction value held in the storage unit, A combustion control unit that calculates a fan correction value by the correction value calculation unit at the time of execution and updates the fan correction value held in the storage unit according to the calculated fan correction value;
When the combustion operation is started by the combustion control unit, whether or not a determination condition including a condition that the filter desorption detection unit detects desorption of the filter is established before the burner is ignited. When the determination condition is satisfied, the fan is operated, the current fan correction value is calculated by the correction value calculation unit, and the calculated fan correction value is equal to or lower than a first predetermined level. As a condition, the fan correction value stored in the storage unit is updated to a fan correction value corresponding to the degree of clogging of the filter being equal to or lower than the first predetermined level, and the determination condition is satisfied. A combustion apparatus, comprising: a filter cleaning coping unit that maintains the fan correction value held in the storage unit when there is not. The combustion apparatus according to claim 1, wherein
As the determination condition, the fan correction value held in the storage unit indicates that the clogging of the filter is equal to or higher than a second predetermined level higher than the first predetermined level, and the filter desorption detection unit A combustion apparatus characterized in that a condition is set that desorption of the filter is detected.