KR100974168B1 - Flow control method for circular pump in boiler - Google Patents

Abstract

The present invention relates to a method for controlling the flow rate of a circulating pump of a boiler, and in particular, in a known operation control method of a boiler, calculating a calorific value by calculating a calorific value of a heat supply relative to a current tapping temperature according to a set temperature when a combustion instruction signal is generated. Wow; Driving the circulation pump at the maximum rotational speed; Continuously detecting whether a heating temperature reaches a set temperature while driving the circulation pump at the maximum rotational speed; When the heating temperature reaches the set temperature, it is possible to control the driving amount of the circulating pump in multiple stages compared to the current control heat by checking which section the burner's maximum supply heat is compared with the current control heat divided into 4 sections. It features.

In the case of controlling the flow rate of the boiler circulating pump in this way, if the amount of heat supplied to the heating is required, the flow rate of the pump can be reduced accordingly, thereby maximizing the heating efficiency and reducing the driving ability of the pump. In addition, it can reduce vibration noise due to pump operation and can significantly reduce power consumption, resulting in energy saving effect. Also, it recognizes the current heating load according to the amount of heat supplied and reduces the circulation flow rate of the pump. Not only can this supply be prevented in advance, but also customer satisfaction can be improved, and the merchandise and reliability of the boiler itself can be greatly improved.

Boiler, Circulating Pump, Blowing Fan, Controlled Heat, Heating Load, Flow Control

Description

Flow control method for circular pump in boiler

The present invention relates to a method for controlling the flow rate of a circulation pump of a boiler, and more specifically, when the amount of heat supplied to the heating is small by adjusting the flow rate of the pump according to the amount of heat supplied to the boiler, the flow rate of the pump is also reduced accordingly. By maximizing the heating efficiency and reducing the driving ability of the pump, it can significantly reduce the vibration noise and power consumption according to the driving of the pump, and have the energy saving effect. It is invented to prevent the supply of more heat than necessary by reducing the amount.

In general, a boiler uses oil, coal, and gas as fuel to burn water or heat water using combustion heat and heat generated by supplying electricity to a heater to supply hot water to various heating facilities. It refers to a facility for boiling water. In the case of a residential boiler, it is used to supply hot water to a pipe installed in the floor of a room to heat it, or to supply hot water through a water pipe.

By the way, the speed of the circulating pump, which is mostly installed in the boiler, is always rotated at a constant speed during the operation of the boiler, or is monotonous operation control that is strongly rotated during combustion and stopped at the time of fire extinguishing. There is a problem to shorten the life of the boiler given the problem, the degradation of heating efficiency and the problem that can not be made comfortable heating is always implicated.

In order to solve this problem, in Korea Patent Registration Nos. 10-279885 and 10-0294415, the thermistors are installed on the heating tapping and heating return sides of a boiler, respectively, and the circulation pump using the difference between the heating tapping temperature and the returning temperature. A method of controlling the number of rotations of the motor is also presented.

However, the circulation pump control method as described above adopts a method of controlling two-stage (high-speed, low-speed circulation pump control) or three-stage (high-speed, medium-speed, low-speed) by using the temperature difference between the heating tapping side and the heating return side. In addition, there is no verification method for the operation of the circulation pump at all, and it still remains a problem that it is difficult to perform a quick and accurate proportional control only by the temperature difference of each hot water.

In addition, in some boilers, the boiler may control the heating flow rate during combustion. In this case, the flow rate of the circulation pump is determined according to the rotation speed of the blower fan to heat the heating.

However, in the case of controlling the circulation pump of the boiler in this way, the boiler system with the changeover of the burner was not suitable for the heating efficiency efficiency.

In addition, when the boiler is ignited, the tapping temperature is low and the maximum combustion occurs. Even if the flow rate is controlled after reaching the set temperature and the rotation speed of the blower fan is lowered, the heat supply is already excessive. In the place where the heating load is small, the inconvenience caused by the flow control of the circulation pump is not seen, and the inconvenience of the consumer occurs.

The present invention has been made in order to solve such a conventional problem, the flow rate of the circulating pump of the boiler when controlling the flow rate of the pump according to the amount of heat supplied to the boiler, not by the rotational speed of the fan By controlling the energy consumption by heating, the flow rate of the pump is reduced accordingly when the heat supply is small, maximizing the heating efficiency, reducing the driving ability of the pump, and reducing the noise generated by the vibration of the pump. It can significantly reduce energy, and also recognize the current heating load according to the heat supply, and reduce the circulation flow rate of the pump to prevent the supply of more heat than necessary, and can greatly improve the customer's satisfaction. It is an object of the present invention to provide a method for controlling the flow rate of a circulating pump in a boiler.

The present invention for achieving the above object is a power supply for supplying a power supply voltage for the operation of the boiler; A remote controller for allowing a user to remotely generate a key signal for driving the boiler; A heating temperature detector detecting a heating temperature; A data storage unit for storing various data necessary for heating and hot water control; A control unit which drives various functional parts of the boiler through the functional part driving unit in response to the key signal output from the remote controller and the heating temperature detected by the heating temperature detection unit; In the boiler operation control method comprising a functional part driving unit for driving a functional part such as a three-way valve, a circulating pump, an igniter, a gas valve and a blowing fan in response to the output signal of the control unit, the combustion instruction signal after the power is supplied Calculating a calorie value by calculating a calorie value compared to a current tapping temperature according to a set temperature when the calorific value is generated; Driving the circulation pump at the maximum rotational speed; Continuously detecting whether a heating temperature reaches a set temperature while driving the circulation pump at the maximum rotational speed; When the heating temperature reaches the set temperature, it is possible to control the driving amount of the circulating pump in multiple stages compared to the current control heat by checking which section the burner's maximum supply heat is compared with the current control heat divided into 4 sections. It features.

At this time, as a result of confirming the current control heat of the burner when the heating temperature reaches the set temperature, if the current control heat amount of the burner is more than 80% and less than 100% of the maximum supply heat, the circulating pump operates the maximum drive amount. Drive in 4 stages set at 95-100% compared to the 3rd section with current control heat exceeding 50% and 80% or less compared to the maximum supply heat and drive the circulation pump in 3 steps set at 83-88% of the maximum drive amount. If the current control calorie is 2 sections, which is more than 30% and less than 50% of the maximum supply heat, the circulation pump is driven in two stages set at 68-75% of the maximum driving amount, and the current control heat is 1% of the maximum supply heat. If the section is greater than 30% or less, it is characterized in that the circulating pump is driven in one stage set at 50-60% of the maximum driving amount.

However, the boundary area of calories may vary according to the heating capacity of the boiler, so allow tolerance of ± 10% respectively.

On the other hand, after the combustion command signal is generated and the heat amount is calculated, before the circulating pump is driven at the maximum rotation speed, the step of detecting whether the heating load is less than the predetermined load by comparing the return temperature conversion rate with respect to the tapping temperature. If the heating load is a predetermined load, the circulation pump is driven to the maximum speed as soon as possible. If the heating load is determined to be less than the predetermined load, reduce the rotational speed of the circulation pump by one step from the maximum speed. It characterized in that for driving the circulation pump at the maximum rotational speed.

As described above, according to the present invention, when performing the flow rate control for the circulation pump of the boiler, heating is controlled by controlling the flow rate of the pump according to the amount of heat supplied to the boiler, not by the rotation speed of the blowing fan. If less heat is required, the flow rate of the pump can be reduced accordingly, thereby maximizing the heating efficiency, reducing the driving ability of the pump, and reducing vibration noise as well as power consumption. Can significantly reduce the energy consumption, and also recognize the current heating load according to the heat supply and reduce the circulating flow rate of the pump to prevent the supply of more heat than necessary, as well as customer satisfaction Can improve the quality and reliability of the boiler itself. Very useful inventions such as that.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows a block diagram of a boiler control circuit to which the present invention method is applied, Figure 2 shows a flowchart for explaining the present invention, Figure 3 (a) (b) is a conventional blower fan speed In response to the control of the circulation pump and when the present invention is applied to the temperature change and calorie control graph is shown, Figure 4 is the control heat amount compared to the fan fan speed when the present invention is applied to a boiler having a burner 5 (a) and (b) show a graph showing a combustion control state according to a heating load when the present invention is applied to a boiler having a switching burner, and FIGS. (d) shows a power supply waveform diagram showing the power supply status of each stage supplied to the circulating pump controlled in multiple stages by the method of the present invention.

According to the present invention, there is provided a method comprising: a power supply unit 1 for supplying a power supply voltage required for the operation of a boiler; A remote controller 2 for allowing a user to remotely generate key signals necessary for driving the boiler; A heating temperature detector (3) for detecting the heating temperature; A data storage section 4 for storing various data necessary for heating and hot water control; A control unit 5 which controls various functional parts of the boiler by driving the functional parts driving unit 6 in response to the key signal output from the remote controller 2 and the heating temperature detected by the heating temperature detection unit 3; ; In response to the output signal of the controller, a functional part driven part 6 for driving functional parts such as a three-way side 62, a circulation pump 64, an igniter 66, a gas valve 68, and a blower fan 70. In the operation control method of the boiler provided with,

When the combustion instruction signal is generated after the power is supplied (S1) and calculating the calorie value by calculating the calorific value compared to the current tapping temperature according to the set temperature (S2);

Driving the circulation pump 64 at the maximum rotational speed MAX (S5);

Continuously detecting whether the heating temperature Tn reaches the set temperature Tset while driving the circulation pump 64 at the maximum rotational speed MAX;

When the heating temperature (Tn) reaches the set temperature (Tset), the circulating pump is sequentially checked to determine which section the burner heat supply is compared to the current control heat section divided into four sections (S7-S9). The drive amount 64 is controlled in multiple stages (for example, four stages) with respect to the current control heat quantity (S10-S13).

At this time, when the heating control temperature Tn reaches the set temperature Tset, the control unit 5 confirms the current control heat of the burner. As a result, the current control heat of the burner exceeds 80% and 100% or less than the maximum supply heat. If it is a section (Yes in S7) to drive the circulation pump 64 in four stages set to 95-100% of the maximum drive amount (S10),

If the current control calorific value is more than 50% of the maximum supply calories than 80% in three sections (Yes in S8) to drive the circulation pump 64 in three stages set to 83-88% of the maximum drive amount (S11),

If the current control heat amount is more than 30% and less than 50% of the two sections (Yes in S9) the circulation pump 64 is driven in two stages set to 68-75% of the maximum drive amount (S12),

If the current control calorific value is more than 1% and 30% or less than the maximum supply calorie 1 (No in S9) characterized in that the circulation pump is driven in one stage (S13) set to 50-60% of the maximum driving amount.

However, the boundary of heat can be changed according to the heating capacity of the boiler, so allow tolerance of ± 10% at the set value of each stage.

On the other hand, in the above-described combustion instruction signal is generated (S1) calories calculated (S2) before the circulating pump 64 to drive the maximum rotation speed (MAX) (S5) to compare the return temperature to the return temperature conversion rate comparison Detecting whether the heating load is smaller than a predetermined load (S3), and if the heating load is a predetermined load (No in S3), driving the circulation pump 64 at the maximum rotational speed (MAX) as soon as possible. (S5), if the heating load is determined to be less than the predetermined load (Yes in S3), reduce the rotational speed of the circulation pump 64 by one stage at the maximum rotational speed (MAX) (MAX-1) It characterized in that to drive the circulation pump 64 at the maximum speed.

At this time, the functional part drive unit 6 includes a three-way drive unit 61, a circulation pump drive unit 63, an igniter drive unit 65, a gas valve drive unit 67, a blower fan drive unit 69, and the like.

Referring to the effect of the present invention made of such steps are as follows.

First, the present invention, the power supply unit 1 and the remote control unit 2, the heating temperature detection unit 3, the data storage unit 4, the control unit 5 and the three-way side 62 and the circulation pump 64, the igniter 66 Current control by dividing the driving force of the circulating pump 64 into four stages using the operation control device of a known boiler having a functional part driving unit 6 for driving the gas valve 68 and the blower fan 70). The main technical component is to control the flow rate and amount of heating circulation water by automatically controlling it in multiple stages (ie, four stages) in response to the heat quantity.

For this control, when the combustion instruction signal is input (S1), the control unit 5 calculates the calorific value by calculating the calorific value compared to the current tapping temperature according to the set temperature (S2), and then basically The step S5 of immediately driving the circulation pump 64 at the maximum rotational speed MAX without determining the state of the heating load is performed.

However, in some cases, the actual heating load may be less than the static load compared to the maximum heat supply of the boiler, so that the step of driving the circulation pump 64 at the maximum rotational speed (MAX) immediately after calculating the heat amount as described above ( By determining the total amount of heat supplied per unit time before the tapping temperature reaches the set temperature (S3) without determining if the tapping temperature reaches the set temperature (S3), the heating load is smaller than the predetermined load. When it is determined that the rotational speed of the circulation pump 64 is lowered by one stage (ie, lowered to three stages) at the maximum rotational speed (MAX), the circulation pump 64 can be driven at the maximum rotational speed in three stages. .

In this case, the reason why the circulation pump 64 is driven at the maximum rotational speed (MAX) is that the heating water discharged from the heat exchanger with a high initial temperature of combustion is supplied to the heating pipe faster and more simultaneously and circulated at the same time for a quick time. This is to reach the heating temperature within the set temperature.

As such, the time for driving the circulation pump 64 at the maximum rotational speed MAX is not limited, and is maintained until the heating temperature Tn reaches the set temperature Tset.

The heating temperature Tn reaches the set temperature Tset as a result of comparing the heating temperature Tn and the set temperature Tset with each other (S6) while driving the circulation pump 64 at the maximum rotational speed MAX as described above. Then, the controller 5 sequentially checks which section of the control heat is currently consumed in the burner, that is, which section compared to the current control heat amount divided into four sections (S7-). S9), and the driving amount of the circulating pump 64 is controlled in multiple stages (for example, four stages) in preparation for each section of the maximum supply combustion heat amount thus confirmed (S10-S13).

That is, as a result of checking the current control heat value when the heating water temperature reaches the set temperature, 80% is exceeded but 100% or less in comparison to the maximum supply heat, as shown in FIGS. 4 and 5 (a) (b). If the combustion state is large (Yes in S7), the circulation pump 64 is operated in four stages set to 95-100% as the maximum rotational speed (MAX) (S10).

In addition, when it is determined that the current control heat amount is between 50% and 80% or less of the maximum supply heat and is determined to be between medium combustion and large combustion (Yes in S8), the circulation pump 64 is replaced with 83- of the maximum rotational speed. It is driven in three stages set to 88% (S11).

In addition, when it is determined that the current control heat amount is between 30% and 50% or less of the maximum supply heat and is determined to be between small combustion and medium combustion (Yes in S9), the circulation pump 64 may be 68-relative to the maximum rotational speed. It is driven in two stages set to 75% (S12).

And, if it is determined that the current control calorie is in a small combustion state (No in S9) as one section of more than 1% to 30% or less than the maximum supply calories (50) to 50-60% of the maximum rotational speed of the circulation pump 64 It is driven to the first stage set to (S13).

Of course, in the state in which the circulation pump 64 is controlled in multiple stages (ie, four stages) as described above in response to the current control heat amount, the calorific value of the burner is continuously calculated (S14) and the current according to the calorie change at that time. When the change in the current control calories is determined by continuously determining which section is the control calorific value (S9-S9), it is determined which section is the changed maximum supply calorific value and in response to the result of the circulation pump 64 By repeatedly performing the step (S10-S13) of controlling the driving amount in multiple stages, it is possible to continue to automatically adjust the flow rate of the circulation pump 64 in accordance with the amount of heat supplied to the boiler.

At this time, the rotation speed control of the circulation pump 64 is controlled by a method for controlling the power supply voltage supplied from the controller 5 to the circulation pump 64 for each time zone as shown in (a)-(d) of FIG. 6. Control is divided into stages.

For example, when it is determined that the current control calorific value is 4 sections that are "over 80%-100% or less" in preparation for the maximum supply calorific value, in order to drive the circulation pump 64 at the maximum rotational speed (a) of FIG. It can be driven in four stages to have 100% rotational speed by continuously supplying the power supply voltage.

In addition, when it is determined that the current control heat amount is three sections "over 50%-less than 80%" of the maximum supply calories, the power supply voltage supplied to the circulation pump 64 is about 0, as shown in (b) of FIG. If the control is set to a 5 second "on" time and a time of about 0.08 second "off" time, the driving force of the circulation pump 64 is three-stage drive control having about 80%.

In addition, when it is determined that the current control calories are two sections of "more than 30%-less than 50%" of the maximum supply calories, the power supply voltage supplied to the circulation pump 64 is about 0, as shown in FIG. When the control is performed for 4 seconds " on " time and about 0.17 seconds " off " time, the driving force of the circulation pump 64 is two stage drive control having about 70%.

In addition, when it is determined that the current control heat amount is one section of "more than 1%-less than 30%" relative to the maximum supply heat amount, the power supply voltage supplied to the circulation pump 64 is approximately 0 as shown in FIG. When the control is performed for 3 seconds " on " time and about 0.3 seconds " off " time, the driving force of the circulation pump 64 is one stage drive control having about 50%.

At this time, since the circulation pump 64 takes a long time to stop after being driven once, the actual power supply time and the shutdown time are the same as 0.3 seconds when the circulation pump 64 is driven at, for example, 50%. Since the pump 64 does not stop at the "off" time, but only decreases in speed, and is restarted by the power supply voltage supplied at the "on" time, the driving force of the circulation pump is 50% as a whole and does not stop. The circulation of the heating water is continuous.

In addition, the reason why the circulation pump 64 is not driven to have a driving force of less than 50% is that when the circulation pump is less than 50%, the circulation pump 64 is stopped or the vibration is severe, so that the actual control is not controlled below that. .

In addition, the stage control according to the driving of the circulation pump 64 may be controlled in more detail. However, since there is no difference in the flow rate control of the circulation pump 64, the stage control is performed in the fourth stage.

Meanwhile, in the present invention, after the combustion instruction signal is generated (S1) and the heat amount is calculated (S2), if necessary, as described above, the control of driving the circulation pump 64 at the maximum rotational speed (MAX) is not performed. Prior to this, a step (S3) of detecting whether the heating load is smaller than a predetermined load through a change in tapping temperature for a unit time was further performed to control the driving force of the circulation pump 64 according to the size of the heating load.

As a result of judging the size of the heating load, if the size of the heating load that is being heated in the current boiler is a predetermined load (No in S3) that is the rated load that can be performed in the boiler, the circulation pump immediately as described above. From the step S5 of driving the 64 at the maximum rotational speed MAX in four stages, the following steps are carried out.

However, as a result of determining the heating load in the above, if it is determined that the heating load is smaller than the predetermined load which is the heating load that can be performed in the boiler (Yes in S3), the rotation speed of the circulation pump 64 is rotated at the maximum. Go down to step S6 to detect whether the current heating temperature Tn has reached the set temperature Tset while driving at maximum speed by lowering one stage from the number MAX (for example, from four to three stages). do.

Therefore, in the case of having a heating load smaller than a predetermined heating load capable of heating in the corresponding boiler at the initial stage of heating, unnecessary noise and unnecessary power waste due to unnecessary operation of the circulating pump 64 at maximum in four stages can be prevented in advance. It is.

On the other hand, Figure 3 (a) (b) is a temperature change and calorie control graph when applying the present invention and the conventional control of the circulation pump in response to the fan fan speed, Figure 4 is a burner having the present invention 5 is a graph showing a change in control calorie value compared to a blowing fan rotation speed when applied to a boiler having a boiler, and FIG. 5 (a) (b) shows a combustion control state according to a heating load when the present invention is applied to a boiler having a switching burner. The graphs are shown, with reference to these graphs, and additionally explaining the calorie control applied in the present invention by taking some of the calories and the fan fan speed as an example.

For example, in the case of a boiler with a burner of 20,000 kcal / h, if the number of burners is assumed to be 10, in the case of a changeover burner, the small combustion is when four burners are in operation, and the heavy combustion is a burner. 6, large combustion 10 burners (medium combustion + small combustion) is operating.

In the case of the single burner in the above, since the multi-stage control is performed as shown in FIG. 4, for example, the maximum heat capacity is 20,000 kcal / h, and the rotation speed of the blower fan is about 5,000 rpm, and the minimum (MIN) The amount of heat is 5,000 kcal / h and the fan speed is about 3,000 rpm.

In addition, in the case of the transfer burner, when the heating load is normal, the circulating pump 64 is controlled in four stages as shown in FIG. 5 (a), and when the heating load is small, three stages control is performed as in FIG. 5 (b). In the case of small combustion, the maximum heat quantity is, for example, 12,000kcal / h, and the fan speed at this time is about 5,000rpm, the minimum heat quantity is 5,000kcal / h, and the fan speed at that time is about 3,000rpm. .

In the case of heavy combustion, the maximum heat capacity is, for example, 16,000 kcal / h. At this time, the fan speed is about 5,000 rpm, the minimum heat amount is 8,000 kcal / h, and the fan speed is about 3,000 rpm. do.

In addition, in the large combustion, the maximum heat amount is, for example, 20,000 kcal / h, and the fan speed is about 5,000 rpm, and the minimum heat amount is 13,000 kcal / h, and the fan speed is about 3,000 rpm. Becomes

It should be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

1 is a block diagram of a boiler control circuit to which the present invention method is applied.

2 is a flowchart for explaining the method of the present invention.

Figure 3 (a) (b) is a graph of temperature change and calorie control when controlling the circulation pump in response to the conventional fan fan rotation speed and when the present invention is applied.

Figure 4 is a graph of control calorie change compared to the blowing fan rotation speed when the present invention is applied to a boiler having a burner.

Figure 5 (a) (b) is a graph showing a combustion control state according to the heating load when the present invention is applied to a boiler having a switching burner.

Figure 6 (a)-(d) is a power supply waveform diagram showing the power supply for each stage supplied to the circulating pump controlled in multiple stages by the method of the present invention.

Explanation of symbols on the main parts of the drawings

1: power supply 2: remote control

3: heating temperature detection unit 4: data storage unit

5: control unit 6: functional part driving unit

62: three-way side 64: circulation pump

66: igniter 68: gas valve

70: blowing fan

Claims (5)

In the operation control method of the boiler having a power supply unit, a remote control unit, a heating temperature detection unit, a data storage unit, a control unit and a functional part driving unit for driving a three-way valve, a circulating pump, an igniter, a gas valve, and a blower fan, Calculating a calorific value by calculating a calorific value of the heat supply relative to a current tapping temperature according to a set temperature when a combustion instruction signal is generated; Driving the circulation pump at the maximum rotational speed; Continuously detecting whether a heating temperature reaches a set temperature while driving the circulation pump at the maximum rotational speed; When the heating temperature reaches the set temperature, it is possible to control the driving amount of the circulating pump in multiple stages compared to the current control heat by checking which section the burner's maximum supply heat is compared with the current control heat divided into 4 sections. Circulating pump flow control method of the boiler. The method according to claim 1, As a result of confirming the current control calorific value of the burner while the heating temperature reaches the set temperature in the controller, If the burner's current control heat is 4 sections, the circulation pump is driven in 4 stages, If the current control heat is three sections, the circulation pump is driven in three stages, If the current control heat is two sections, the circulation pump is driven in two stages, If the current control calorific value 1 section, the circulation pump flow control method of the boiler, characterized in that for driving the circulation pump in one stage. The method according to claim 2, In the state in which the circulation pump is controlled in multiple stages corresponding to the current control heat amount, the calorific value of the burner is continuously calculated, and the current control heat amount is continuously determined by changing the current control heat amount according to the heat change at that time. If is determined that the changed maximum supply calories belong to which section, and in response to the results in response to the result of the circulating pump flow rate control method of the boiler characterized in that the multi-stage control to change again. The method according to claim 2, Four sections of the current control heat is more than 80% to 100% less than the maximum supply calories, the four-stage drive of the circulation pump is to drive at 95-100% of the maximum drive amount, Three sections of the current control heat is more than 50% to 80% less than the maximum supply heat, the three-stage drive of the circulation pump is to drive 83-88% of the maximum drive amount, The two sections of the current control heat is more than 30% and less than 50% of the maximum supply heat, the three-stage drive of the circulation pump is to drive at 68-75% of the maximum drive amount, One section of the current control heat is greater than 1% 30% or less than the maximum supply calories, the first stage drive of the circulation pump is characterized in that the driving of 50-60% of the maximum amount of driving the flow rate of the boiler. The method according to claim 1, After the combustion instruction signal is generated and the heat amount is calculated, and before the circulating pump is driven at the maximum rotation speed, the step of detecting whether the heating load is smaller than the predetermined load by the conversion amount of the tapping temperature for a unit time is further performed. As a result, if the heating load is more than the predetermined load, the circulating pump is driven to the maximum speed as soon as possible. If it is determined that the heating load is smaller than the predetermined load, the step of detecting whether the current heating temperature has reached the set temperature while driving the circulation pump by lowering the rotational speed by one step from the maximum speed (from 4 to 3) is performed. Circulating pump flow control method of the boiler, characterized in that the one.

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