JPH1114045A - Operation judgment method of air blow amount controller and hot water supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a check work, at an execution site, for checking if an air blow amount controller is acceptable or not by changing rotational speed of a blower fan, detecting an emitted CO value contained in an exhaust gas at a rotational speed after change and comparing it with a reference CO value so as to make a judgment of abnormality of air blow amount control operation. SOLUTION: In order to make operation judgment treatment of an air blow amount controller 9 in a hot water supply apparatus 1, at the time of tuning on a judgment starting switch a command for switching a fan motor 8 to a rotational speed of 'Great' is transmitted from an air blow amount judgment means 11 to a hot water supply controller 6 and combustion operation at a combustion quantity corresponding to the rotational speed of the fan motor 8 of 'Great' is started. At this time, detection signal of a CO sensor 10 is monitored by the air blow amount judgment means 11, and when detected exhaust CO value is within a reference CO value (x), combustion operation is carried out at a combustion quantity corresponding to a rotational speed of the fan motor 8 of 'Small'. If the exhaust CO value is out of the reference CO value range, air blow amount control operation abnormality is judged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining the operation of an air flow control device and a hot water supply device, and more particularly to a method for easily determining whether the air flow control device of a combustion device is functioning normally. Related to technology.

[0002]

2. Description of the Related Art Conventionally, in supplying combustion air to a burner in a combustion device such as a gas water heater, the supply amount of fuel such as gas supplied to the burner and the number of revolutions of a fan motor are associated in advance. The control is performed by increasing or decreasing the rotation speed of the fan motor according to the fuel supply amount.

[0003] However, the amount of air supplied to the combustion device by the rotation of the blower fan depends on various factors such as the shape of the airflow passage through which the combustion air passes, aging, and the influence of the surrounding wind. Since the air resistance (flow path resistance) in the path changes, the amount of air that actually flows through the air flow path (hereinafter, referred to as “actual air flow”) does not match the rotation speed of the fan motor. For this reason, recently, this kind of combustion apparatus has been provided with an air flow control device that controls the number of revolutions of a fan motor in accordance with a change in the actual air flow in order to secure an air flow according to the combustion amount. Was.

[0004] As such a blower amount control device, the applicant of the present invention has a three-way system of a fan motor rotation speed N, a current (drive current) I flowing through the fan motor, and a flow path resistance Φ of a blower flow path. Focusing on the fact that there is a certain correlation as shown in FIG. 4 (right quadrant in FIG. 4), for example, the rotational speed N of the fan motor and the drive current I are detected, and the flow path resistance is determined from these values. There is proposed an air flow control device that calculates Φ and changes the rotation speed N of the fan motor based on the calculated flow path resistance Φ so as to obtain an appropriate air flow according to the fuel supply amount. In this case, the calculation of the flow path resistance Φ is configured to be performed according to a calculation program stored in a storage element of a microcomputer provided in the air flow control device.

[0005]

However, it is not easy to confirm at the construction site of a combustion device whether or not such a blower amount control device is functioning normally.
As described above, in the air flow rate control device in which the arithmetic processing is performed using the microcomputer, all the initial adjustments are performed by a specialist inside a production factory or the like before the shipment of the product, so that such expertise is required. At the construction site of a combustion device that does not have specialized skills, it has been extremely difficult to check whether the air volume control device is functioning properly.

[0006] The present invention has been proposed in view of the above problems, and determines the operation of an air flow control device that enables easy confirmation at a construction site whether the air flow control device of a combustion device is functioning normally. It is an object of the present invention to provide a method and a hot water supply apparatus which realizes the method.

[0007]

According to a first aspect of the present invention, there is provided an air flow control device for controlling an air flow of combustion air to a combustion device. While changing the rotation speed of the fan motor of the blower fan, and detecting the exhaust CO value contained in the combustion exhaust gas at the changed rotation speed. Is compared with a preset reference CO value according to the number of rotations, and when the detected exhaust CO value matches the preset reference CO value, it is determined that the air volume control operation is normal, If the value is different from the reference CO value, the air flow control operation is determined to be abnormal.

According to the first aspect of the present invention, the operation determination of the blower amount control device includes the step of forcibly changing the rotation speed of the fan motor in a state where the combustion device is burned, and the rotation speed after the change. This is performed by detecting the exhaust CO value at That is, if the blower control device is operating normally by the initial adjustment at the factory, even if the combustion amount of the combustion device is increased to forcibly increase (change) the rotation speed of the fan motor, it is detected there. The exhaust CO value should be the same as the CO value emitted during normal combustion operation. Therefore, according to the first aspect of the present invention, by using the CO value discharged during the normal combustion operation as a reference CO value and comparing the detected CO value with the actually detected exhaust CO value, the blower amount control device can be appropriately controlled. It is determined whether or not it is operating.

According to a second aspect of the present invention, when comparing the exhaust CO value with the reference CO value in the operation determination method of the blower amount control device according to the first aspect, the reference CO value has a certain allowable range. Is provided, and the presence or absence of an abnormality in the air volume control operation is determined based on whether or not the detected exhaust CO value is within the allowable range.

That is, if the air flow control device is operating normally, as described above, the theoretically detected exhaust C
The O value and the reference CO value will match, but in practice C
The value of the exhaust CO value detected due to various causes such as variation in the O sensor and variation in the combustion state also slightly fluctuates. For this reason, in the invention of claim 2, by setting this variation as an allowable range in advance, the reference CO value itself has a certain width, thereby preventing such erroneous determination due to such a slight variation in the exhaust CO value. .

[0011] The invention according to claim 3 is based on claim 1.
Alternatively, in the operation determination method of the blower air amount control device according to claim 2, the number of revolutions of the fan motor is changed at least twice or more, and all of the exhaust CO values detected at each number of revolutions are changed to a reference CO. If the value matches the value, it is determined that the air volume control operation is normal, and any one of the
If the value is different from the O value, it is determined to be abnormal. Therefore, according to the third aspect of the present invention, the above-described operation determination of the blower volume control device is repeated two or more times.
It is possible to reduce erroneous determinations.

The invention described in claim 4 is the first invention.
In the operation determination method of the air volume control device according to claim 3, in detecting the exhaust CO value at the changed rotation speed, the exhaust CO value is detected after the detected exhaust CO value is stabilized. Is performed. That is,
According to the invention of claim 4, the exhaust CO value immediately after forcibly changing the rotation speed of the fan motor appears as a normal exhaust CO value even if the blower amount control device is operating normally. In view of the fact that there is a time lag, the erroneous detection due to such a time lag is prevented by waiting for the detected exhaust CO value to stabilize.

According to a fifth aspect of the present invention, the method according to the first to fourth aspects is applied to a hot water supply apparatus, wherein at least a burner and a heat exchanger heated by the burner are provided. A water inlet pipe and a hot water pipe connected to the heat exchanger, a fan motor for sending out combustion air to the burner, and a hot water supply control section for controlling each part of the hot water supply apparatus toward a set hot water supply temperature. And, the drive current of the fan motor is detected, the flow resistance of the blower flow path is obtained from the drive current and the rotation speed of the fan motor, and the combustion operation command signal from the hot water supply controller and the flow path resistance are obtained. A hot water supply device that controls the number of revolutions of the fan motor on the basis of a CO sensor that detects the amount of carbon monoxide contained in the combustion exhaust gas from the burner. The exhaust CO value at each rotation speed is detected by changing the rotation speed of the fan motor at least twice while the burner is in the combustion state, and the exhaust CO value at each rotation speed is stored in advance in correspondence with each rotation speed. It is characterized by comprising a blowing operation determining means for comparing the obtained reference CO value and determining whether the blowing amount control operation is normal,
The invention according to claim 6 is characterized in that when the air blowing operation determining means determines that the air blowing amount control operation is abnormal, the air blowing operation determining means includes an informing means for notifying the abnormality of the air blowing operation to the outside. The inventions according to claim 5 and claim 6 are provided with the above-described air volume control device according to the proposal of the present applicant as the air volume control unit.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for judging the operation of an air flow control device and a hot water supply device according to the present invention will be specifically described with reference to the drawings.

FIG. 1 is a schematic overall configuration diagram in the case where the method for judging the operation of an air flow control device according to the present invention is applied to a hot water supply device. As shown in FIG.
And a heat exchanger 3 heated by the burner 2, a water inlet pipe 4 and a hot water pipe 5 connected to the heat exchanger 3, and hot water supply control for controlling each part of the hot water supply apparatus 1 toward a set hot water temperature. A sirocco fan (blowing fan) 7 for sending combustion air to the burner 2 and a fan motor 8 thereof; and a fan motor 8 for controlling the number of revolutions of the fan motor 8 for combustion in the burner 2. An air flow control unit (air flow control device) 9 for supplying an appropriate air flow, a CO sensor 10 for detecting the amount of carbon monoxide contained in the combustion exhaust gas from the burner 2, and the air flow control unit A blower operation judging means 11 for judging an abnormality in the blower amount control operation 9 is provided as a main part. Note that all of the hot water supply control unit 6, the blowing amount control unit 9, and the blowing operation determination unit 11 are realized by a microcomputer.

In FIG. 1, reference numeral 12 denotes a fuel supply pipe for supplying fuel such as gas or oil to the burner 2.
The fuel supply pipe 12 is provided with a fuel supply valve 13, and the water supply pipe 4 is provided with a water supply valve 14. Both the fuel supply valve 13 and the water supply valve 14 are constituted by proportional valves, and can be controlled by the hot water supply control unit 6. Reference numeral 15 denotes a casing of the hot water supply device 1. A lower part of the casing 15 is connected to a fan case 16 having the sirocco fan 7 in communication with a combustion chamber A in which the burner 2 is arranged. An exhaust pipe 17 opened to the outside is provided at an upper portion of the casing 15. Reference numeral 18 denotes a remote controller of the water heater 1.
Thus, various remote operations on the hot water supply apparatus 1 such as setting of hot water supply temperature are enabled.

When operation of the water heater 1 is instructed by operating the remote controller 18, the hot water controller 6 causes the remote controller 18 to operate.
The hot water supply control is started in accordance with the hot water supply set temperature set in. More specifically, information necessary for air flow control according to the amount of combustion in the burner 2 is sent to the air flow control unit 9 as a combustion operation command signal, and the fuel supply valve 13 and the water supply valve 14 are sent. Is opened, the burner 2 is ignited, and the combustion operation of the water heater 1 is started. On the other hand, in the blowing amount control unit 9 receiving the combustion operation command signal, once,
After rotating the fan motor 8 at the initial rotation speed, the burner 2
With the start of the combustion operation, the control of the rotation speed of the fan motor 8 is started based on the combustion operation command signal as described later.

After the combustion operation is started in this way, the hot water supply control unit 6 operates the remote controller 18.
Hot water supply temperature, which is changed as appropriate in
The hot water supply control is performed so as to maintain the hot water supply at the hot water supply set temperature by adjusting the opening of the fuel supply valve 13 while taking into account various information from a water amount sensor and the like (not shown) provided in the apparatus. Also,
The information is appropriately transmitted as a combustion operation command signal to the air volume control unit 9.
Is sent to

On the other hand, the blower amount controller 9 controls the fan motor 8 according to the combustion amount commanded by the combustion operation command signal.
And the rotational speed of the fan motor 8 determined in accordance with the combustion amount is appropriately corrected based on the flow path resistance of the air flow path, so that the combustion amount of the burner 2 is always included in the air flow path. Is controlled in such a manner that an appropriate amount of air can be obtained according to the air flow. That is, as described above, the actual air flow supplied to the combustion chamber A by the blower fan 7 fluctuates with a change in the flow path resistance. The variation of the air volume is corrected.

Specifically, the rotation speed N of the fan motor 8
Since a certain correlation as shown in the right quadrant of FIG. 4 is observed between the drive current I of the fan motor 8 and the flow path resistance Φ of the blower flow path, The section 9 detects the rotation speed N and the drive current I of the fan motor 8, calculates a flow path resistance Φ from these values, and, based on the calculated flow path resistance Φ, determines the flow rate of the burner 2 according to the amount of combustion. Air volume Q
Is calculated based on the relationship of the left quadrant in FIG. 4 to correct the actual rotation speed of the fan motor 8.

For example, if the detected actual rotation speed of the fan motor 8 is N ₁ and the driving current is I ₀ , the flow path resistance becomes Φ ₁ . If the target air flow rate of the blower fan 7 according to the combustion amount of the burner 2 is Q ₂ , the rotation speed required by the fan motor 8 is determined to be N _2. In step 9, the rotation speed of the fan motor 8 is corrected so as to increase the rotation speed of the fan motor 8 by (N ₂ −N ₁ ).

As described above, part of the air flow control unit 9 is constituted by a microcomputer, so that all of these operations are realized according to an operation program stored in a storage element of the microcomputer. . In addition, although not shown in the blowing amount control unit 9,
Various detection means necessary for performing the above-described arithmetic processing, such as rotation number detection means for detecting the rotation number of the fan motor 8 and current detection means for detecting the drive current of the fan motor 8, and the fan motor 8 based on the calculation results And a motor drive IC for supplying drive power to the motor.

The present invention is intended to make it possible to easily confirm whether or not the air volume control unit 9 of the hot water supply apparatus 1 having the above structure is operating normally even at a construction site. For this purpose, the apparatus includes the CO sensor 10 and the blowing operation determining means 11.

As described above, the CO sensor 10 detects the amount of carbon monoxide contained in the combustion exhaust gas from the burner 2, and is provided in the exhaust flow path of the combustion exhaust gas from the burner 2. I have. Specifically, as shown in FIG.
The detection signal from the CO sensor 10 is provided in the exhaust pipe 17 of the hot water supply device 1 and is sent to the blowing operation determination means 11.

On the other hand, the blower operation judging means 11 performs an abnormality judgment of the blower amount control operation of the blower amount control section 9. Specifically, while the burner 2 is in a combustion state, the fan motor 8 A rotation speed setting unit (not shown) for changing the rotation speed at least once (in this embodiment, twice) is provided, and the exhaust CO value at the rotation speed set by the rotation speed setting unit is set to the above value. The exhaust gas CO value detected by the CO sensor 10 and a reference CO determined in accordance with the rotational speed set in advance by the rotational speed setting means.
The values are compared with each other to determine whether the two CO values match.

More specifically, for example, when the number of revolutions set by the above-mentioned number-of-rotations setting means is two large and small, as shown in FIG. The exhaust CO value at the time of performing the combustion operation is stored as a reference CO value (x, y) in a storage element of the microcomputer, and the rotation speed setting means is operated so that the hot water supply control unit 6 controls the large and small two. The combustion operation command signals corresponding to the rotation speeds are sequentially output to the air volume control unit 9 to determine whether or not the actually detected exhaust CO value at each rotation speed falls within an allowable range with respect to the reference CO value. To judge. That is, assuming that the reference CO value when the rotation speed of the fan motor 8 is large is a value indicated by x in FIG. 2, the exhaust CO value detected at this time is the reference CO value x ±
If it is within the range of α, it is determined that the air volume control unit 9 is operating normally, and if it is not within the allowable range, it is determined that the air volume control unit 9 is not operating normally. It is.

This is because the exhaust gas CO value detected when the rotational speed of the fan motor 8 is forcibly changed by the rotational speed setting means so as to be different from the initial rotational speed at the start of the combustion operation. If the air volume control unit 9 is operating normally, the value should be close to the reference CO value. By comparing the two CO values, the air volume control operation of the air volume control unit 9 can be performed normally. It is to determine whether or not it is functioning. In this case, the allowable range is provided for the reference CO value because the actually detected exhaust CO value has a slight deviation for various reasons as described above, and the deviation is considered in advance. It is. Also, the present embodiment
The reason why the rotation speed setting means changes the rotation speed of the fan motor 8 between two, large and small, is to increase the number of times of detection of the exhaust CO value so as to make a more accurate determination. Therefore, the number of revolutions set by the number of revolutions setting means is not limited to the two large and small numbers of revolutions, and is not particularly limited as long as the number of revolutions is different from the initial number of revolutions.
If the number of times the O value is detected is at least once (preferably two or more), the setting can be appropriately changed. Further, it is a matter of course that the allowable range of the reference CO value can be appropriately set and changed.

Then, such a blowing operation determining means 11
Although the operation determination of the blower volume control unit 9 is not shown in the drawings, a “determination start switch” for instructing the start of the control operation determination is operated by operating the operation panel of the water heater 1 (specifically, installing the water heater 1). Position where the installer is easy to operate when installing)
And the like, and it is preferable to start the operation by operating the determination start switch. In addition, a notifying means for notifying the determination result by the blower operation determining means 11 (for example, generation of an alarm sound by a buzzer) It is preferable that the remote controller 18 be provided in the main body of the water heater 1 or the remote controller 18.

The procedure for judging the operation of the blower volume control section 9 in the hot water supply apparatus 1 thus configured will be described with reference to the flowchart of FIG.

(1) First, the determination start switch provided in the hot water supply device 1 is turned on (step S1 in FIG. 3).

(2) Thereby, the air blowing amount determining means 11
A command is issued to the hot water supply control unit 6 to set the preset rotation speed of the fan motor 8 to “large”, and in response to this, the hot water supply control unit 6 responds to the rotation speed of the fan motor 8 “large”. The start of the combustion operation at the amount of combustion to be performed is instructed to each unit of the hot water supply device 1 including the air volume control unit 9 (step S in FIG. 3).
2). As a result, based on the combustion operation command signal from the hot water supply control unit 6, the air volume control unit 9 starts the air volume control taking the above-described flow path resistance into consideration from the initial rotation speed.

(3) When the combustion operation is started in this way, the air blowing amount determining means 11 starts monitoring the detection signal from the CO sensor 10 to determine whether the exhaust CO value is stabilized. (Step S3 in FIG. 3). The determination as to whether or not the exhaust CO value is stable is preferably made by, for example,
While sampling the detection signal from the sensor 10 at a certain timing, the previous detection value and the current detection value are compared, and it is determined whether or not the difference between the two detection values is equal to or less than a predetermined value. If the difference between the two detected values is smaller than a predetermined value, it is determined that the exhaust CO value is stable, and the process proceeds to the subsequent step S4 in FIG. 3. If the difference is not smaller than the predetermined value, the process is repeated. The monitoring in step S3 in FIG. 3 is continued.

(4) When the exhaust CO value is stabilized, the process proceeds to step S4 in FIG. 3, and the detected exhaust CO value and the reference C when the rotation speed of the fan motor 8 is "large" are determined.
By comparing with the O value x, it is determined whether or not the value of the exhaust CO value is within the allowable range of x ± α (step S in FIG. 3).
4).

(5) If it is determined that the determination result in step S4 in FIG. 3 is within the allowable range, the process proceeds to step S5 in FIG. In response to this, the hot water supply control unit 6 starts the combustion operation at the combustion amount corresponding to the rotation speed of the fan motor 8 "small". To each part of the hot water supply apparatus 1 (step S5 in FIG. 3). As a result, the air volume control unit 9 starts the air volume control based on the combustion operation command signal from the hot water supply control unit 6, as in the case of step S2 in FIG.

(6) When the combustion operation is started by changing the amount of combustion in the burner 2 in this way, step S3 in FIG.
It is determined whether or not the exhaust CO value has stabilized in the same manner as in FIG.
In step S6), when it is determined that the exhaust CO value has become stable, the process proceeds to the subsequent step S7 in FIG. 3, and when it is not stable, the monitoring in step S6 in FIG. 3 is continued again.

(7) When the exhaust CO value is stabilized again, in step S7 in FIG. 3, the detected exhaust CO value is
By comparing with the reference CO value y when the rotation speed of the fan motor 8 is “small”, the exhaust CO value is within the allowable range y ±
It is determined whether it is within the range of β (step S7 in FIG. 3).

(8) If it is determined in step S7 in FIG. 3 that the exhaust CO value is within the allowable range (y ± β), the air volume control operation of the air volume controller 9 is normal. And a signal to the effect that the air volume control operation is normal is sent to the notification means. The informing means informs that the air volume control operation is normal, for example, by sounding an "OK buzzer" (step S8 in FIG. 3).

(9) On the other hand, if it is determined in step S7 in FIG. 3 that the exhaust CO value is out of the allowable range (y ± β), the air volume control operation of the air volume control unit 9 is performed. It is determined that there is an abnormality, and a signal notifying the abnormality of the air volume control operation is sent to the notification means. In the notification means,
As described above, for example, an “NG buzzer” sounds (FIG. 3
The notification of step S9) and the like are performed. It should be noted that the determination that the air volume control operation is abnormal is also performed when it is determined in step S4 in FIG. 3 that the exhaust CO value is out of the allowable range (x ± α). This is reported through means.

As described above, according to the present invention, the determination of the air volume control operation of the air volume control unit 9 can be performed by one operation of the determination start switch. It is possible to easily confirm whether or not the operation is performed. Moreover, since the determination result in this case is notified through the notifying means, even a person who is not familiar with the structure of the hot water supply device 1 can easily know the operation abnormality of the air supply amount control unit 9.

The above-described embodiment merely shows a preferred embodiment of the present invention, and the present invention is not limited to this, and various design changes can be made within the scope.

For example, in the above-described embodiment, the air volume control in the air volume control unit 9 is performed based on the calculation of the flow path resistance. Is also applicable. That is, in addition to calculating the actual air flow rate based on the flow path resistance as in the above-described embodiment, the actual air flow rate is directly detected using an air volume sensor or the like as the air flow rate control method of the air flow rate control device. The present invention can be applied to control.

Further, in the above embodiment, the determination of the air volume control operation is performed by operating a determination start switch (not shown). However, it is of course possible to automate the operation instead of such a switch operation. In addition, the notification means is changed to a visible display such as an LED display,
It is also possible to use them together.

Although the above embodiment employs a configuration in which the burner combustion amount is changed at the time of determination of the blower amount control operation, the present invention provides a method in which only the setting of the rotation speed is changed while the combustion amount is kept constant. Is also feasible. In addition,
In this case, the reference CO value and the setting of the permissible range are naturally changed as appropriate.

[0044]

As described above in detail, according to the method for determining the operation of the air flow control device according to the present invention, a special inspection device or the like determines whether or not the air flow control device of the combustion device is functioning normally. It is possible to easily and surely check at a construction site or the like, without using a computer.

Further, in the hot water supply apparatus to which the method for judging the operation of the air volume control device according to the present invention is applied, the air blowing operation judging means for judging the operation of the air volume control device can be constituted by a microcomputer, and the exhaust CO value can be detected. Can be realized by a simple design change of the conventional hot water supply device, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall schematic configuration diagram of a hot water supply apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an operation determination method of an air flow control device according to the present invention.

FIG. 3 is a flowchart illustrating a procedure of an operation determination by a blowing operation determining unit of the hot water supply apparatus according to the present invention.

FIG. 4 is an explanatory diagram showing the relationship among the number of rotations of a fan motor of a blower fan, a drive current, a flow path resistance, and an amount of blown air.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot-water supply apparatus 2 Burner 3 Heat exchanger 4 Inlet pipe 5 Outlet pipe 6 Hot-water supply control unit 7 Blower fan 8 Fan motor 9 Blowing-amount control unit (blowing-amount control unit) 10 CO sensor 11 Blowing operation determining means 12 Fuel supply pipe 17 Exhaust stack 18 Remote controller x, y Reference CO value

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuhiko Sato 93, Edocho, Chuo-ku, Kobe-shi, Hyogo Noritsu Co., Ltd.

Claims (6)

[Claims] 1. A blower control device for controlling a blown amount of combustion air to a combustion device, comprising: changing a rotation speed of a fan motor of a blower fan while the combustion device is in a combustion state; The exhaust CO value contained in the combustion exhaust gas at the rotational speed is detected, and the detected exhaust CO value is compared with a reference CO value set in advance according to the changed rotational speed. When the exhaust CO value matches the preset reference CO value, the air flow control operation is determined to be normal, and when the exhaust CO value is different from the reference CO value, the air flow control operation is determined to be abnormal. An operation determination method of the air volume control device. 2. A comparison of the exhaust CO value with the reference CO value, wherein a predetermined allowable range is provided for the reference CO value, and the air flow rate is determined based on whether or not the detected exhaust CO value is within the allowable range. The method according to claim 1, wherein the presence or absence of an abnormality in the control operation is determined. 3. The fan motor is varied at least twice in number of revolutions, and when all of the detected exhaust CO values at each of the revolutions match the reference CO value, the air volume control operation is performed. 3. The method according to claim 1, wherein the operation is determined to be normal, and if any one of the operations is different from the reference CO value, the operation is determined to be abnormal. 4. The method according to claim 1, wherein when detecting the exhaust CO value at the changed rotational speed, the exhaust CO value is detected after the detected exhaust CO value is stabilized.
An operation determination method for the air volume control device according to any one of claims 1 to 3. 5. At least a burner, a heat exchanger heated by the burner, a water inlet pipe and a hot water pipe connected to the heat exchanger, a fan motor for sending combustion air to the burner, and setting. A hot water supply control unit that controls each unit of the hot water supply apparatus toward the set hot water supply temperature, and detects a drive current of the fan motor, and determines a flow path resistance of an air flow passage from the drive current and the rotation speed of the fan motor. A hot water supply device having a blower volume control unit for controlling a rotation speed of the fan motor based on a combustion operation command signal from the hot water supply control unit and the flow path resistance, wherein the air supply amount is included in combustion exhaust gas from the burner. A CO sensor for detecting the amount of carbon monoxide is provided, and while the burner is in a combustion state, the number of revolutions of the fan motor is changed at least twice or more to reduce the exhaust gas at each number of revolutions. Detecting the CO value, the exhaust gas in the respective rotational speed C
A hot water supply apparatus comprising: a blowing operation determining unit configured to compare the O value with a reference CO value stored in advance corresponding to each rotation speed to determine whether the blowing amount control operation is normal. 6. The air conditioner according to claim 5, further comprising a notifying unit for notifying the abnormality of the air volume control operation to the outside when the air volume control operation is determined to be abnormal by the air flow operation determining unit. Water heater.