JP3312968B2 - Combustion apparatus, method for detecting soot clogging thereof, and method for detecting failure of CO sensor in combustion apparatus with CO sensor using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a CO sensor failure detecting method of a water heater and a soot clogging detecting method combustor and its of heating or the like, the CO sensor with a combustion apparatus using the same.

[0002]

2. Description of the Related Art In recent years, in order to reduce the size of a combustion device such as a water heater, a bath pot, or a heater using gas or oil as a fuel, a fuel fan is provided in the device to reduce the amount of fuel. Is supplied to the burner to perform forced combustion. However, if the combustion fan no longer supplies air to the burner in proportion to the amount of fuel and the balance between the amount of fuel and air is lost, partial incombustibility tends to occur. There was a risk of adhesion and fire. FIGS. 5 and 6 show examples of the occurrence of partial non-combustion due to such an imbalance between the fuel amount and the air amount.

FIG. 5 shows a water heater of a type in which a combustion fan 3 is disposed on the exhaust side. When such a water heater is installed on a dusty ground or the like, the burner 1 Dust is sucked in from the air port of the burner, and the dust accumulates inside the burner port 1a of the burner 1 as shown in the figure. Therefore, the air supplied to the burner 1 becomes uneven, and the balance between the air amount and the fuel amount is lost. In addition, non-combustion occurs in a portion where dust adheres to the flame opening of the burner 1, soot is rapidly attached to the heat exchanger 2, and soot clogging occurs.

FIG. 6 shows a water heater of a type in which a combustion fan 3 is disposed on the air supply side. In such a water heater, a punching metal is provided between the combustion fan 3 and the burner 1. By providing the pressure equalizing plate 4, the air from the combustion fan 3 is equally divided and the air is supplied to each part of the burner 1. In this case, the suction force by the rotation of the combustion fan 3 is strong, and the air supply port 3a
Insects such as mosquitoes and moths are sucked in from the
As a result, air is not evenly supplied to the burner 1 and partial incombustibility occurs, so that the heat exchanger 2 is clogged with soot as described above.

[0005] As described above, partial non-combustion occurs and the heat exchanger 2
Conventionally, when soot clogging occurs, there is no method for detecting this, and the user of the combustion apparatus has to rely on human senses, for example, to notice dirt on soot around the apparatus or an unusual smell during combustion. On the other hand, a CO sensor is provided in the combustion device, and the CO sensor detects the CO gas in the exhaust gas. When the detected CO concentration reaches a predetermined reference concentration, an alarm device is activated. In the combustion device with a CO sensor provided with a CO safety device that performs the CO safety operation, the CO detection concentration reaches the reference concentration due to partial non-combustion as described above, so that the CO safety operation by the CO sensor is performed. But C
If the O sensor fails, the CO safe operation is not performed, so that the partial non-combustion is left unattended, which may lead to a disaster, which is very dangerous.

[0006]

However, it is extremely dangerous to rely solely on human senses to determine soot clogging.
There is a demand for a combustion device having a function of automatically detecting this.

[0007] In a combustion device with a CO sensor,
If the soot clogging of the heat exchanger can be automatically detected, even if the soot clogging is detected, the failure of the CO sensor will be detected when the CO safety operation is not performed by the CO sensor. Accidents due to combustion can be prevented beforehand.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a combustion apparatus and a combustion apparatus which can automatically detect soot clogging in a heat exchanger without relying on human senses.
And to provide a CO sensor failure detection method of soot clogging detection method and the CO sensor with a combustion apparatus using the same of the patron.

[0009]

The present invention is configured as follows to achieve the above object. That is, in the soot clogging detection method of the present invention, the fuel supplied to the burner is burned by utilizing the air taken in by the rotation of the combustion fan, and the combustion heat is used to heat the heating medium passing through the heat exchanger. A method for detecting soot clogging of a device, comprising:
Temperature information of the heating medium at the inlet and outlet of the heat exchanger;
By taking in information including the fuel supply amount and the flow rate of the heating medium, the thermal efficiency is sequentially calculated and monitored during the combustion operation of the burner,
Compare with the reference thermal efficiency value given in advance and calculate by calculation.
Tolerance before and after the difference between the values before and after the thermal efficiency
When the calculated value of the thermal efficiency falls below a predetermined allowable deviation from the value of the reference thermal efficiency in a state where it is smaller than the box, it is determined that soot clogging of the heat exchanger has occurred and the soot clogging detection signal is generated. It is configured to output, and the CO sensor failure detection method of the combustion device with the CO sensor of the present invention using the CO sensor, the CO device for detecting the CO concentration in the exhaust gas to the combustion device, A CO safety device for performing a CO safety operation when the CO detection concentration of the CO sensor reaches a predetermined reference concentration is provided .
If the calculated value of the thermal efficiency calculated by the soot clogging detection method falls below a predetermined reference thermal efficiency value by more than a predetermined allowable deviation, a failure detection signal of the CO sensor is output when the CO safety operation is not performed. It is characterized by doing. Further, the combustion device of the present invention is provided with a burner
The fuel supplied to the engine is taken in by the rotation of the combustion fan.
It burns using the air that is contained and heats it with this combustion power.
A combustion device for heating a heating medium passing through an exchanger, comprising:
Temperature information of the heating medium at the inlet and outlet of the exchanger
Captures information, including feed rates and heating medium flow rates
And monitor the thermal efficiency sequentially during burner combustion operation
Means and a predetermined reference thermal efficiency value,
The difference between the values before and after the thermal efficiency obtained by
Thermal efficiency when it is less than
Calculated value exceeds the allowable deviation from the reference thermal efficiency value.
When the temperature decreases, it is determined that the heat exchanger has clogged with soot.
And a means for outputting a soot clogging detection signal
And features. In addition, the combustion device with the CO sensor of the present invention
The device detects the concentration of CO in the exhaust gas in the combustion device.
The CO detection concentration of the O sensor and the CO sensor is given in advance.
CO safety operation when a certain reference concentration is reached
4. An apparatus for monitoring a thermal efficiency according to claim 3, further comprising:
The calculated value of the thermal efficiency calculated by the
Exceeding the specified allowable deviation from the obtained reference thermal efficiency value
When the CO safety operation is not performed when the
Equipped with a means for outputting a failure detection signal for the CO sensor
It is characterized by being.

[0010]

According to the present invention, the temperature information of the heating medium at the inlet and the outlet of the heat exchanger, the fuel supply amount, and the information of the flow rate of the heating medium are obtained from
The thermal efficiency during the burner combustion operation is sequentially calculated and monitored, and when the calculated value of the thermal efficiency falls below a predetermined allowable deviation from the value of the reference thermal efficiency, which is the thermal efficiency when there is no soot clogging, for example, the combustion device And outputs a soot clogging detection signal.

Further, in a combustion device with a CO sensor in which a CO safety operation is performed by the CO sensor when the CO concentration in the exhaust gas reaches the reference concentration, even if the soot clogging is detected as described above, the CO sensor is used. When the CO safety operation is not performed, a failure of the CO sensor is detected.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of a method for detecting soot clogging of a combustion device according to the present invention and a method for detecting a failure of a CO sensor of a combustion device with a CO sensor using the method.

FIG. 2 shows a system configuration of a water heater in which a heating medium is water as a combustion device in the present embodiment. In FIG. 1, a water supply pipe 6 is connected to the inlet side of the heat exchanger 2, and the water supply pipe 6 includes an input-side thermistor 8 for detecting an incoming water temperature and a flow sensor 9 for detecting a flow rate of water. Is provided. A hot-water supply pipe 7 is connected to the outlet side of the heat exchanger 2, and the hot-water supply pipe 7 is provided with an outlet-side thermistor 10 for detecting hot water temperature. (Not shown).

A burner 1 is provided below the heat exchanger 2, and gas as fuel is supplied to the burner 1 from a gas pipe 12, while a combustion fan 3 below the burner 1 rotates. Air is supplied to the burner 1, and the water passing through the heat exchanger 2 is heated by the combustion heat generated by the combustion of the gas and air in the burner 1. Further, the gas pipe 12 is provided with a gas proportional valve 13 for controlling a gas supply amount based on a valve opening amount, and a gas solenoid valve 18 for opening and closing a pipe.

This type of water heater is provided with a control device 11, which is connected to a remote controller (not shown). The remote controller has buttons for setting the hot water temperature and a display section for the set temperature. Is provided. The control device 11 controls the hot water supply operation of the water heater. When the hot water tap is opened, the flow rate sensor 9 detects the flow rate of water, and when the flow rate exceeds a certain flow rate, the flow rate sensor 9 The control device rotates the combustion fan 3 in response to the signal from the
And change the valve opening amount of the gas proportional valve 13 so that the heat exchanger 2
The stabilization control of the hot water temperature coming out is performed.

Further, in this water heater, a CO sensor 19 for detecting the CO concentration in the exhaust gas is provided on the exhaust side.
This is a water heater with an O sensor, and a CO sensor 19 is connected to a CO safety device 5 formed in the control device 11,
When the detected O concentration reaches the reference concentration, the alarm device 40 is operated, or the gas solenoid valve 18 is closed to stop the combustion.
It is configured to perform a safe operation.

The present embodiment detects soot clogging in the water heater with a CO sensor having the above-described structure by utilizing a decrease in the thermal efficiency of the burner in the combustion operation due to soot clogging of the heat exchanger 2.

FIG. 1 shows a block diagram of a soot clogging detection unit 17 for performing the soot clogging detection method of the present embodiment. The soot clogging detection unit 17 is formed inside the control device 11, and includes a temperature detection unit 20, a fuel supply amount measurement unit 21,
Flow rate detection unit 22, thermal efficiency calculation unit 24, stability determination unit 25,
Average thermal efficiency calculation unit 27, comparison determination unit 28, notification unit 29,
It has a data storage unit 30 and a memory 31.

The data storage section 30 stores the reference thermal efficiency and the allowable deviation. The reference thermal efficiency is a thermal efficiency at the time of burn operation of the burner when the heat exchanger 2 has no soot clogging,
As shown by curve A in FIG. 3, the thermal efficiency gradually increases after the start of combustion and stabilizes at a constant value. Therefore, the thermal efficiency at the time of this stabilization is obtained and stored in advance by experiments, calculations and the like. I have. Generally, the standard thermal efficiency of the water heaters of Nos. 3 to 16 is approximately 79 to 83%.

The allowable deviation is an allowable range based on the reference thermal efficiency for judging that the heat exchanger 2 is not clogged with soot. When the heat exchanger 2 has soot clogging, its thermal efficiency is lower than the reference thermal efficiency when the heat exchanger 2 has no soot clogging, as shown by a curve B in FIG. In the above, when the value of the thermal efficiency falls below the allowable deviation from the value of the reference thermal efficiency, a soot clogging detection signal of the combustion device is output.

The reference concentration when the CO safety device 5 performs the CO safety operation is C at the time when the soot clogging detection signal is output.
A value sufficiently lower than the O detection concentration is set. In other words, the thermal efficiency during the burner combustion operation falls below the reference thermal efficiency by more than the allowable deviation, and the CO detection concentration reaches the reference concentration before the soot clogging detection signal of the combustion device is output, and C
It is configured to perform a CO safe operation by the O sensor.

The temperature detecting section 20 detects temperature information of water on the inlet side and the outlet side of the heat exchanger 2 by the input side thermistor 8 and the output side thermistor 10 and uses them as input side temperature and output side temperature. Added to the thermal efficiency calculation unit 24.

The fuel supply amount measuring unit 21 measures the fuel supply amount supplied to the burner 1, and this fuel supply amount is
It is obtained by measuring the valve-opening drive current flowing through the gas proportional valve 13 and is added to the thermal efficiency calculation unit 24.

The flow rate detector 23 receives the signal from the flow rate sensor 9 and detects the flow rate of water flowing into the water supply pipe 6.
The detected flow rate is added to the thermal efficiency calculation unit 24.

In the thermal efficiency calculating section 24, the above-mentioned inlet side temperature,
From the information on the outlet temperature, fuel supply amount, and flow rate, the thermal efficiency during the combustion operation of the burner 1 is sequentially calculated and monitored using a built-in arithmetic circuit. The value of the thermal efficiency is: thermal efficiency = effective heat amount / supplied heat amount = λ · (outlet temperature−inlet temperature) · flow rate / (α
・ Fuel supply). Here, λ is the specific heat of the heating medium, and becomes 1 in the case of water.
Α is the amount of heat per unit volume of the gas serving as the fuel. The calculated value of the thermal efficiency thus obtained is stored in the memory 31
Are stored sequentially.

The stability judging section 25 reads the calculated value of the thermal efficiency stored in the memory 31, compares the immediately preceding value of the thermal efficiency with the latest calculated value of the thermal efficiency, and finds the difference as a predetermined tolerance. When it becomes smaller than the range, it is determined that the thermal efficiency is stable, and the stable signal is transmitted to the average thermal efficiency calculating unit 27.
Add to

Upon receiving the stable signal, the average thermal efficiency calculating section 27 reads out the latest three thermal efficiency calculated values before and after the latest stored in the memory 31 after the stable signal is issued, and sequentially reads out the three calculated values. The average of the three calculated values of the thermal efficiency is calculated by a built-in arithmetic circuit, and the average is added to the comparison / determination unit 28 as the average thermal efficiency.

A comparison circuit is formed in the comparison judgment section 28, which receives the value of the average thermal efficiency and stores this value in the data storage section 30.
Is compared with the reference thermal efficiency value stored in. And
The average thermal efficiency value is larger than the reference thermal efficiency value in the data storage unit 30.
When the temperature exceeds the permissible deviation stored in the heat exchanger 2, it is determined that soot clogging has occurred, a soot clogging detection signal is added to the notification unit 29, and the CO sensor detects
When the O-safety operation is not performed, the CO sensor failure detection signal is also added to the notification unit 29.

In response to the soot clogging detection signal and the CO sensor failure detection signal, the notifying unit 29 sounds the alarm 40 or displays it on the display unit of the remote controller to notify the clogging of the combustion device and the CO sensor failure. I do. In addition, gas solenoid valve
Perform safety actions such as shutting down combustion by closing 18.

According to the present embodiment, the thermal efficiency during the combustion operation of the burner is sequentially calculated and monitored. When the calculated value of the thermal efficiency falls below the value of the reference thermal efficiency by more than an allowable deviation, soot clogging occurs in the combustion device. It is determined that there is, and the soot clogging detection signal is output. Thus, the soot clogging is automatically detected without relying on human senses.

Even if the soot clogging is detected as described above, if the CO safety operation is not performed by the CO sensor, the failure of the CO sensor is detected.

FIG. 4 shows the configuration of a second embodiment in which the present invention is applied to an FF type petroleum fan heater in which the heating medium is air. A filter 16 is provided on the inlet side of the cool air entering from the room, and the cool air is supplied to the blower fan 15.
Is sent in the direction of the heat exchanger 2 by the rotation of. The inlet-side thermistor 8 measures the temperature of the cold air on the inlet side of the heat exchanger 2,
The outlet thermistor 10 detects the temperature of warm air on the outlet side of the heat exchanger 2. Further, the amount of oil supplied to the burner 1 is controlled by an electromagnetic pump 14, which has the same function as the gas proportional valve 13 of the water heater.

Further, the air supplied to the burner 1 is taken in from outside by the rotation of the combustion fan 3. The combustion heat generated by the combustion of the air and oil in the burner 1 heats the air passing through the heat exchanger 2 and discharges this warm air into the room. The exhaust side is equipped with a CO sensor 19 for detecting the CO concentration in the exhaust gas.
As in the first embodiment, a CO safety device 34 is connected to the CO sensor 19, and the CO safety device 34 is configured to perform a CO safety operation when the detected CO concentration exceeds the reference concentration. ing.

Also in the case of the FF type oil fan heater with the CO sensor, if the heat exchanger 2 is clogged with soot, the burner 1
The soot clogging is detected by sequentially calculating and monitoring the thermal efficiency during the combustion operation in the same manner as in the first embodiment. However, in this case, the fuel supply amount measuring unit 21 in the first embodiment shown in FIG. 1 uses an electromagnetic pump 14 instead of the gas proportional valve 13 to measure the fuel supply amount of petroleum by its drive current. In addition, in the flow rate detecting section 22, the flow rate sensor 9
Instead of this, a blower fan 15 is used, and the amount of air blown as the flow rate of air is obtained from this power consumption. This amount of air can be determined by the number of rotations of the blower fan 15, but in this case, if the filter 16 is clogged, or if there is a reverse wind from the outlet side of the heat exchanger 2, the exhaust resistance increases. The blowing amount and the rotation speed of the blower fan 15 are not proportional, and an accurate blower amount cannot be obtained from the rotation speed of the blower fan 15.

On the other hand, when the exhaust resistance increases as described above, the pressure on the blow-out side of the blower fan 15 increases, and the blower fan 15 approaches the idle rotation, so that the load on the monitor 15a for driving the blower fan 15 decreases. Therefore, the power consumption of the blower fan 15 is reduced. Also, as the exhaust resistance increases, the amount of air blows also decreases.
Although the power consumption of the fan 15 also tends to be small, the power consumption and the air flow rate are not necessarily in a proportional relationship, so in the present embodiment, the air flow rate is accurately obtained based on the information on the rotation speed of the blower fan 15 and the power consumption. I have.

As described above, the amount of air blown from the rotation speed and power consumption of the blower fan 15, the temperature information on the inlet and outlet sides of the heat exchanger 2 from the inlet thermistor 8 and outlet thermistor 10,
The fuel supply amount is determined by the drive current of the electromagnetic pump 14,
As in the first embodiment, the thermal efficiency is sequentially calculated and monitored based on these pieces of information, and the average value of the thermal efficiency after the stability is compared with the reference thermal efficiency, thereby automatically detecting the soot clogging. . Further, even if the soot clogging is detected, when the CO safety operation is not performed by the CO sensor, the failure of the CO sensor is detected, and the same effect as in the first embodiment is obtained.

Note that the present invention is not limited to the above-described embodiment, but can adopt various embodiments. For example, in each of the above embodiments, when the soot clogging detection signal is generated,
When each allowable deviation when detecting the failure of the O sensor is set to the same value, the value of the stable thermal efficiency falls below the allowable deviation from the value of the reference thermal efficiency and soot clogging is detected. Although it was configured to detect the failure of the CO sensor,
The detection of the failure of the CO sensor is earlier than the detection of the soot clogging, that is, a value smaller than the allowable deviation is newly set as a quasi-permissible deviation, and the value of the average thermal efficiency is smaller than the value of the reference thermal efficiency. When it falls beyond the deviation, CO
A failure of the sensor may be detected.

In each of the above embodiments, the average thermal efficiency value after the thermal efficiency is stabilized is stored in the memory 31, the latest one, the previous one, and the previous one.
Although it was determined from the average value of three thermal efficiencies, it may be determined from the average value of a plurality of thermal efficiencies other than three. Furthermore, the average thermal efficiency may be compared with the reference thermal efficiency value using only the latest thermal efficiency value stored in the memory 31 after the thermal efficiency is stabilized, without calculating the average thermal efficiency.

Further, in the above embodiment, the fuel supply amount was determined from the drive current flowing through the gas proportional valve 13 and the electromagnetic pump 14. However, a flow meter is provided in a gas supply pipe such as a gas pipe or an oil pipe. Thus, the fuel supply amount may be directly measured.

Further, in each of the above embodiments, the description has been made using the water heater with the CO sensor and the oil fan heater.
Obviously, even in a combustion device not equipped with a sensor, clogging of the combustion device is detected by the same method as in the above embodiments.

Further, in the first embodiment, when a soot clogging detection signal or a CO sensor failure detection signal is applied to the notifying section 29, the notifying section 29 closes the gas solenoid valve 18 to cut off the gas fuel path and burn. Although the stop is performed, the notification unit 29 applies a shutoff signal to the CO safety device 5 when the respective detection signals are added, and cuts off the gas fuel path through the CO safety device 5 in the same manner as described above. Alternatively, the combustion may be stopped. In addition, it gives an alarm, turns on the ventilation fan,
The information may be displayed on a remote controller.

Further, in the above embodiment, it was determined that the thermal efficiency was stable when the difference between the latest value of the calculated thermal efficiency and the value immediately before the calculated value became smaller than the allowable range.
A fixed time may be set from the time of ignition of the burner, and when this time has elapsed, it may be determined that the thermal efficiency has stabilized.

Further, in the above embodiment, after the calculated value of the thermal efficiency becomes stable, the calculated value of the thermal efficiency is compared with the reference thermal efficiency to detect soot clogging and failure of the CO sensor. No determination is made, for example, data of the reference thermal efficiency based on the time from the start of ignition of the burner and the combustion amount is given in advance, and the calculated value of the thermal efficiency from the time of ignition is compared with this reference thermal efficiency to similarly determine the soot. Clogging and failure of the CO sensor may be detected. In this case, since the measured temperature of the output side thermistor 10 has a time lag due to the flow rate, the temperature can be accurately obtained by performing correction according to the flow rate.

Further, depending on the fuel supply amount, the combustion fan 3
In a combustion apparatus of a type in which the air blowing amount is varied and combustion control is performed as fuel supply amount ≒ fan air blowing amount, fan air blowing amount data may be used as fuel supply amount data. The amount of supply / the amount of fan air / the number of fan rotations may be treated.

[0045]

According to the present invention, the soot clogging of the combustion apparatus is controlled by the temperature information of the heating medium on the inlet side and the outlet side of the heat exchanger, the flow rate of the heating medium, and the fuel supply amount during the burner combustion operation. On the basis of, the thermal efficiency is sequentially calculated and monitored, and it is determined that there has been soot clogging when the calculated value of the thermal efficiency has decreased beyond the allowable deviation from the value of the reference thermal efficiency, and a soot clogging detection signal has been output. As a result, it becomes possible to automatically detect soot clogging of the combustion device without relying on human senses as in the related art. In particular, in the present invention, the calculated value of the thermal efficiency is used as the reference thermal effect.
When detecting soot clogging compared to the efficiency,
When the difference between the calculated values is smaller than the allowable range,
In other words, thermal efficiency is stable (combustion is stable)
Since the status is substantially checked, the detection of soot clogging is ensured.
And improved reliability of soot clogging detection
It is.

In a combustion device with a CO sensor,
As described above, even if it is determined that soot clogging is detected, when the CO safety operation is not performed by the CO sensor, the failure of the CO sensor is automatically detected, and measures against CO gas are taken to be thorough. Become.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment for performing a soot clogging detection method for a combustion device and a CO sensor failure detection method for a combustion device with a CO sensor using the same according to the present invention.

FIG. 2 is a system configuration diagram of a water heater used in the embodiment.

FIG. 3 is a graph showing a change over time in thermal efficiency with and without soot clogging in the example.

FIG. 4 is a configuration diagram of a second embodiment in which the present invention is applied to an FF type oil fan heater.

FIG. 5 is an explanatory view showing an aspect of soot clogging of a water heater of a type in which a combustion fan is arranged on an exhaust side.

FIG. 6 is an explanatory diagram showing an aspect of soot clogging of a water heater of a type in which a combustion fan is arranged on an air supply side.

[Explanation of symbols]

 Reference Signs List 1 burner 2 heat exchanger 3 combustion fan

Claims (4)

(57) [Claims] 1. A method for detecting soot clogging in a combustion device in which fuel supplied to a burner is burned by utilizing air taken in by the rotation of a combustion fan, and a heating medium passing through a heat exchanger is heated by the combustion thermal power. And the temperature information of the heating medium on the inlet side and the outlet side of the heat exchanger, the fuel supply amount,
By taking in information including the flow rate of the heating medium and sequentially calculating and monitoring the thermal efficiency during the combustion operation of the burner, comparing it with the reference thermal efficiency value given in advance, and calculating the thermal efficiency
Is smaller than the allowable range given in advance
Turned and when decreased beyond a predetermined tolerance than the value of the operation value is a reference thermal efficiency of the thermal efficiency, it is determined that the soot clogging of the heat exchange <br/> exchanger occurs soot clogging detection signal in the state that A soot clogging detection method for a combustion device that outputs a signal. 2. A CO sensor for detecting a CO concentration in exhaust gas to a combustion device, and a C sensor for performing a CO safety operation when the CO detection concentration of the CO sensor reaches a predetermined reference concentration.
An O-safety device is provided, and the CO-safe operation is performed when a calculated value of the thermal efficiency calculated by the method according to claim 1 falls below a predetermined value of the reference thermal efficiency by a predetermined allowable deviation.
A failure detection method of a CO sensor of a combustion device with a CO sensor that outputs a failure detection signal of the CO sensor when the operation is not performed . 3. A combustion fan for supplying fuel supplied to the burner.
Combustion using the air taken in by the rotation of
Heats the heating medium passing through the heat exchanger with the combustion power of
Combustion device, heating at the inlet and outlet of the heat exchanger
The temperature information of the medium, the fuel supply amount, and the flow rate of the heating medium are
Captures information to improve thermal efficiency during burner combustion operation.
Means for monitoring successive calculations, and reference thermal efficiency given in advance
The value before and after the thermal efficiency calculated by comparing with the value of
Is smaller than the allowable range given in advance
In the condition, the calculated value of thermal efficiency is
If the temperature falls outside the specified tolerance, the heat exchanger
Judging that jam has occurred and outputting a soot clogging detection signal
Means. 4. Detection of CO concentration in exhaust gas by a combustion device
And the CO detection concentration of the CO sensor
C to perform CO safety operation when the obtained reference concentration is reached
An O-safety device is provided to sequentially perform the thermal efficiency according to claim 3.
The calculated value of the thermal efficiency calculated by the
Than the given reference thermal efficiency value Predetermined tolerance
If CO safety operation is not performed when
Equipped with a means to output a failure detection signal of the CO sensor
Combustion device with a CO sensor.