KR20170091869A

KR20170091869A - Central heating system and method including heat supplementary unit of return line pipe

Info

Publication number: KR20170091869A
Application number: KR1020160012676A
Authority: KR
Inventors: 정기영
Original assignee: 정기영
Priority date: 2016-02-02
Filing date: 2016-02-02
Publication date: 2017-08-10
Also published as: KR101832440B1

Abstract

A central heating control system including a heat source replenishing unit of the recovery pipe and having at least one heat source replenishment unit in a recovery pipe for recovering hot water by reheating the thermal energy after supplying heat energy to the central boiler, A control method is disclosed. The present invention relates to a circulating central heating control system, comprising: a supply flow rate meter installed in the supply duct; A supply temperature sensor installed in the supply line; A recovered flow rate meter installed in the return pipe; A recovery temperature sensor installed in the recovery pipe; A heat source replenishing unit installed in the recovery pipe and capable of supplying thermal energy to the hot water recovered in the recovery pipe; And a control unit connected to the supply flow rate meter, the supply temperature sensor, the recovered flow rate meter, the recovery temperature sensor, the heat source replenishing unit, and the pump unit in a wire or wireless communication manner.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a central heating control system and a control method of a central heating control system including a heat source replenishing unit of a recovery pipe,

The present invention relates to a central heating control system, and more particularly, to a control system for a central heating system, which comprises a heat source replenishing portion of a recovery pipe, which has at least one heat source replenishing portion in a recovery pipe for recovering hot water by a central boiler for reheating after supplying heat energy A central heating control system, and a control method for controlling the flow rate and temperature using the control system.

The method of providing heating to a space such as a building can be roughly divided into central heating, individual heating, and district heating. Among the above-mentioned heating methods, the central heating system has a separate boiler room such as a plurality of buildings or a collective building, and a boiler is installed inside the boiler to warm water from the boiler to the building or space And heating is provided on the floor.

Since the central heating method as described above has a high thermal efficiency, the total cost of warming the hot water is low, and the user can adjust the hot water supplied through the valve to reduce the heating cost. Therefore, , Which is commonly used in apartment houses and is also used in large buildings with lots of compartments.

1 shows a conventional central heating system. 1, the conventional central heating system heats the hot water through the boiler 10 and also provides the hot water to the building B via one or more pumps 40. A supply temperature sensor 11 for measuring the temperature of the hot water entering the building B and a temperature sensor for supplying the thermal energy to the building B and the temperature of the hot water recovered to the boiler 10 A recovery temperature sensor 12 is provided.

Further, when hot water is supplied to the building B from the boiler 10, when the hot water is supplied in an amount exceeding the capacity of the supply pipe, the thermal efficiency lowers and there is a risk of backflow. When the pressure difference between the supply pipe and the return pipe is different by a certain range or more, a part of the hot water in the supply pipe is directly supplied to the supply pipe line by connecting one pipe and providing the circulation pipe differential pressure valve By transferring the water to the return pipe, excessive hot water is prevented from being supplied to the building (B).

However, the conventional central heating system shown in FIG. 1 is inexpensive as compared with the individual heating, and central heating also causes a cost. One of the most expensive parts in the central heating system is the boiler (10). The boiler 10 must be able to heat all of the hot water capable of supplying thermal energy to the building B divided into the plurality of sections B1, B2, and B3. Therefore, the size of the hot water is inevitably increased, It also increases in proportion to the amount of hot water to be heated.

In the general central heating system as described above, the hot water is supplied to the building to be heated in the boiler, and then the hot water, which becomes a heat source from the building, is recovered and reheated. If the temperature difference between the hot water and the hot water recovered by the boiler can be reduced, the temperature difference to be heated by the boiler is reduced, so that the amount of power supplied to the boiler can be reduced, thereby realizing cost reduction.

Patent No. 10-0849578 (November 20, 2007) Patent No. 10-1104362 (2009.11.23) Patent No. 10-0984831 (Jul. 2010) [Patent document 10-1013526 (December 22, 2009) [Patent document 10-1260198 (2012.02.14)] [Patent document 10] 2002-0081012 (Apr. 19, 2001)

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a central heating control system having a heat source replenishing unit of a recovery pipe, which has one or more heat source replenishment units in a recovery pipe, And an object of the present invention is to provide a control method for controlling the speed and temperature of hot water using the central heating control system.

In order to accomplish the object of the present invention as described above,

And supplying hot water to the building through a supply pipe line installed in the central boiler and supplying the hot water to the building through a return pipe extending from the supply pipe line, And the hot water is returned to the boiler through the circulation type central heating control system, the circulation type central heating control system comprising: a supply flow rate meter installed in the supply pipe; A supply temperature sensor installed in the supply line; A recovered flow rate meter installed in the return pipe; A recovery temperature sensor installed in the recovery pipe; A heat source replenishing unit installed in the recovery pipe and capable of supplying thermal energy to the hot water recovered in the recovery pipe; And a control unit connected to the supply unit, the supply temperature meter, the recovered flow rate meter, the recovery temperature sensor, the heat source supplement unit, and the pump unit so as to be communicably connected in a wired or wireless manner, And a heat source replenishing unit of the central heating control system.

The heat source replenishing unit may include a heat exchange unit in which a space is formed in the body so as to store water therein, and at least one electric heater is installed in the space; A friction heating unit comprising at least one friction heating device; And at least one power supply unit capable of supplying electric energy to the heat exchanging unit and the friction heating unit.

A method of controlling a flow rate of the supply pipe and a return pipe through the central heating control system, comprising: measuring a supply hot water velocity and a recovered hot water velocity (S11); A supply flow rate inspection step (S12) of judging whether the supply hot water velocity measured in the velocity measurement step (S11) is within a set allowable range; A pressure increasing step (S13) of increasing the pressure inside the supply pipe and the return pipe when the supply water flow rate is determined to be less than the set allowable range in the supply flow rate inspecting step (S12); In the supplying flow rate checking step S12, if it is determined that the supplied hot water speed is within the set allowable range, a proportional value measuring step (S14) for measuring a proportional value; A proportional value inspection step (S15) of judging whether the proportional value measured in the proportional value measuring step (S15) is within a set permissible range; If it is determined in step S12 that the supplied hot water speed has exceeded the set allowable range, or if it is determined in step S15 that the proportional value is located outside the set allowable range, (S16) for determining whether the recovered hot water velocity measured in the velocity measuring step (S11) is within a set allowable range; A signal generating step (S17) of sending out an abnormal signal visually from the control unit when the recovered flow rate inspection step S16 determines that the recovered hot water speed is less than the allowable range; The method according to any one of claims 1 to 3, wherein in the recovered flow rate inspection step (S16), the recovered hot water velocity is within an allowable range or exceeds a permissible range, or after the signal generation step (S17) A pressure reducing step (S18) for reducing the internal pressure; In the proportional value checking step S15, when the proportional value is within the permissible range, a maintaining step S19 for maintaining the pressure inside the supply pipe and the return pipe is performed to obtain the flow rate of the central heating control system of the present invention .

Also, a method of controlling the temperature of the supply pipe and the return pipe through the central heating control system may include: a temperature measurement step (S21) of measuring a supply temperature and a recovery temperature; A supply temperature inspection step (S22) of determining whether the supply temperature measured in the temperature measurement step (S21) is within a set allowable range; (S23) of sending out an abnormal signal visually from the control unit when the supply temperature is determined to be higher than or less than the set allowable range in the supply temperature inspection step (S22); (S22), if it is determined that the supply temperature is within the set allowable range, a recovery temperature inspection step (S21) of determining whether the recovery temperature measured in the temperature measurement step (S21) S24); A pressure reducing step (S25) of reducing the pressure inside the supply pipe and the return pipe when it is determined in the recovering temperature inspection step (S24) that the recovered temperature exceeds the allowable range; If it is determined in step S24 that the recovered temperature is within the permissible range, a heat source supplement step S24 for operating the heat source replenishing unit 300 is performed to obtain the central heating control system Lt; / RTI >

According to the present invention, by supplementing the heat source of the hot water recovered by the boiler due to one or more heat source replenishers installed in the recovery pipe, the temperature difference between the hot water supplied to the building compartment and the temperature recovered to the boiler from the building compartment It is possible to use a smaller boiler because the power consumption of the boiler is reduced and the lifetime of the boiler can be increased. It can also be expected.

1 is a structural view of a central heating control system of the present invention;
2 is a flowchart showing a procedure for controlling the flow rate of the central heating control system of the present invention.
3 is a flowchart showing a procedure for controlling the temperature of the central heating control system of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be described in more detail with reference to the accompanying drawings. The following description is intended to assist in the understanding and understanding of the present invention, but is not to be construed as limiting the invention thereto. Those skilled in the art will appreciate that various modifications and changes may be made within the spirit of the invention as set forth in the following claims.

1 is a structural diagram of a central heating control system 1000 having a heat source replenishing unit of a return pipe of the present invention. Hereinafter, the configuration and operation of the present invention will be described with reference to FIG.

1, a thick solid line means a pipeline through which hot water can move, a thin solid line means an electric line through which a current flows, and a thin dotted line means a communication line through which communication can be made . The communication line may be formed by wire or wireless.

1, the duct includes a supply line SL for supplying heated hot water to the building B and hot water discharged from the central boiler 100 (RL) to be transferred to the recovery pipe (RL). The arrows shown in Fig. 1 indicate the transfer direction of the hot water which can be transferred through the supply pipe line S-L and the return pipe line R-L.

1, the control system 1000 of the present invention includes a central boiler 100 that supplies thermal energy to hot water, A supply flow rate meter 110 installed on the supply line SL for measuring the flow rate of the hot water supplied by the central boiler 100 and a supply flow rate meter 110 installed on the supply line SL, And a temperature sensor 111 for measuring the temperature of the liquid.

A recovery flow rate meter 120 for measuring the flow rate of the hot water recovered through the return pipe RL is provided on the recovery pipe RL. The recovery flow rate meter 120 measures the temperature of the recovered hot water, A sensor 121 is installed.

A differential pressure pipe PL is provided between the supply pipe line SL and the return pipe line RL so that the hot water on the supply pipe line SL is directly supplied to the return pipe line SL without passing through the building B, (RL), and a circulation pipe differential pressure valve (200) is installed on the differential pressure pipe (PL).

The heat source replenishing unit 300 is installed on the return pipe R-L. The heat source replenishing unit 300 is a part that replenishes thermal energy of the hot water recovered to the central boiler 100 through the recovery pipe R-L.

More specifically, the heat source replenishing unit 300 is provided with at least one electric heater 311 therein. The heat source replenishing unit 300 includes a heat exchange unit 311 for storing a predetermined amount of water, A friction heating part 320 composed of at least one friction heating device 321 to 323, a first and a second heating part 320 for supplying electric energy to the heat exchanging part 310 and the friction heating part 320, 2 power supply units 330 and 331, and a solar heat supply unit 340. [

Here, the first and second power supply units 330 and 331 may be conventional power supply means, and the solar heat supply unit 340 is a facility for performing solar power generation. The first and second power supply units 330 and 331 and the solar thermal power supply unit 340 may be replaced by other power generation means, or may be integrally used.

Further, the pump unit 400, which is provided on the return pipe R-L and is formed of one or more pumps, has the same function and function as the conventional structure, so that a description thereof will be omitted.

The control unit 500 for controlling the central heating control system 1000 of the present invention includes the supply flow rate meter 110, the supply temperature sensor 111, the recovered flow rate meter 120, the recovery temperature sensor 121, The first and second electric power supply units 330 and 331 and the solar heat supplying unit 340 in the heat source replenishing unit 300 and the heat source replenishing unit 300 are connected to each other in a wired or wireless manner, And controls the components.

Hereinafter, a method of supplying heat energy to the hot water of the return pipe (R-L) will be described in detail.

The heat source replenishing unit 300 supplies thermal energy to the hot water of the return pipe RL in two ways. One is to supply heat energy to the hot water of the return pipe RL through the friction heating unit 320 And the other is to supply heat energy to the hot water of the return line RL from the heat exchanging unit 310.

Herein, the friction heating unit 320 will be described first. The friction heating unit 320 is composed of at least one friction heating device. The friction heating device is applied to the friction heating unit 320, It is desirable to use a friction heating system as disclosed in the above-referenced Patent No. 10-1306165. Hereinafter, as shown in FIG. 1, the friction heating unit 320 is configured by three friction heating devices 321 to 323.

The hot water of the return pipe RL heated primarily through the three friction heating devices 321 to 323 is transferred to the heat exchanging unit 310. At this time, And the remaining hot water is transferred to the heat inflow pipe 322 extending from the return pipe RL. At this time, the heat inlet pipe 322 is brought into contact with the hot water contained in the space inside the body of the heat exchange unit 310, and at this time, the heat inlet pipe 322 has a continuous S Shaped.

At this time, hot water introduced into the body of the heat exchanging unit 310 uses a part of the hot water of the return pipe (RL) heated by the friction heating unit 320, so that hot water in the heat inflow pipe 322 is heated to a certain temperature As shown in FIG.

One or more electric heating wires 311 are installed in the body of the heat exchanging unit 310. The one or more electric heating wires 311 are connected to the at least one electric power supplying unit 330 and 331 and the solar heat supplying unit 340 As shown in Fig. Also, the power supply units 330 and 331 and the solar heat supply unit 340 may supply power to other components requiring power. Since this is a conventional technique, a description thereof will be omitted.

The at least one electric heating wire 311 heats the hot water flowing into the body of the heat exchanging unit 310 to provide secondarily the hot water to the hot water in the heat input pipe 322.

The pump unit 400 serves to supply pressure to the supply line SL and the inflow line RL. The structure and operation of the pump unit 400 are the same as those of the conventional pump unit. The description of which will be omitted.

The control unit 500 controls the supply flow rate meter 110, the supply temperature sensor 111, the recovered flow rate meter 120, the recovery temperature sensor 121, the heat exchange unit 310, the friction heating unit 320, (400) in a wired or wireless manner so as to be able to control the above components.

2 is a flowchart showing a method of controlling the flow rate of the central heating control system 1000 of the present invention in the supply line S-L and the return line R-L. Hereinafter, the flow rate control method of the control system 1000 of the present invention will be described with reference to FIG.

The flow rate control method of the control system 1000 of the present invention is performed by the controller 500. The controller 500 measures the supplied hot water velocity V1 through the supply flow rate meter 110, A speed measuring step S11 for measuring the recovered hot water velocity V2 through the recovered flow rate meter 120 is performed.

A supply flow velocity check (V1) for determining whether the measured supply hot water velocity (V1) is within an allowable range after measuring the measured supply hot water velocity (V1) and the recovered hot water velocity (V2) A step S12 is performed. Since the allowable range of the supply hot water velocity V1 is determined by the size and the number of the buildings B and the diameters of the supply and return pipes SL and RL, The allowable range of the speed V1 may be calculated and set in the controller 500. For example, when a 1000-square-meter building segment using a pipe having a diameter of 50 mm is used as an example, The range of the speed V1 is preferably 0.5 m / s or more and 3.0 m / s or less. If the speed is less than 0.5 m / s, the hot water can not be circulated smoothly to the pipeline. If the speed exceeds 3.0 m / s, the building B can not effectively supply heat energy, There is a risk of pipe breakage.

If the speed of the supplied hot water velocity V1 is measured to be less than the allowable range in the supply flow rate inspection step S12, the controller 500 controls the pump 400 to increase the pressure in the channel, A step S13 is performed. The pressure inside the pipe increases according to the pressure increasing step S13, so that both the supply hot water velocity V1 and the recovered hot water velocity V2 can be increased.

When the supplied hot water velocity V1 is within the allowable range, the proportional value measuring step S14 for measuring the proportional value? V is performed in the supply flow rate inspecting step S12, When the speed V1 exceeds the above allowable range, a collection rate inspection step (S16) of inspecting the value of the recovered hot water rate (V2) is performed.

The permissible range of the recovered hot water velocity V2 is determined by determining the value of the recovered hot water velocity V2 in the same manner as the supply hot water velocity V1 And the diameter of the supply and return pipes SL and RL, the user can calculate the permissible range of the recovered hot water velocity V2 in consideration of the above factors and set it in the controller 500 , And a building zone of 1000 m 2 using a pipe having a diameter of 50 mm is taken as an example. With the above example as a reference, the recovered hot water velocity V2 is 0.5 m / s or more and 3.0 m / s or less . The reason for the flow rate allowable range is the same as the supply hot water speed V1, so that a description thereof will be omitted.

If the recovered hot water velocity V2 is within the permissible range or higher as a result of measuring the recovered hot water velocity V2 through the recovered flow velocity inspecting step S16, A pressure reducing step (S18) for lowering the internal pressure is performed. By performing the pressure reducing step S18, the supply hot water velocity V1 and the recovered hot water velocity V2 can be lowered. After the pressure reduction step S18 is performed, the velocity measurement step S11 is performed again.

If the recovered hot water velocity V2 is measured at a rate less than the allowable range in the recovered flow rate inspection step S16, the supplied hot water velocity V1 is higher than or at least within the permissible range, It means that the recovered hot water velocity V2 is less than the permissible range. This means that there is a problem such as leakage or clogging in the supply pipe line SL or the return pipe line RL, which means that the flow velocity is sharp and strong. Accordingly, the control unit 500 performs a signal generation step S17 to notify the manager of the occurrence of a problem in the supply line SL or the return line RL, and performs the pressure reduction step S18, Reduces the speed (V1, V2).

As described above, when the supply hot water velocity V1 is within the permissible range, the proportional value measurement step S14 is performed to measure the proportional value DELTA V, (P = V1 / V2) obtained by dividing the recovered hot water velocity V2 by the supply hot water velocity V1, and the range of the proportional value? V is the same as the flow rate velocities V1 and V2 The size and the number of compartments of the building B, the diameter of the supply and return ducts SL and RL, and the like. As an example, a building area of 1000 m 2 using a pipe having a diameter of 50 mm, which is the same condition as the above flow rates V 1 and V 2, will be described as an example. The allowable range of the proportional value? 1 or more and 6 or less.

If the proportional value? V exceeds or falls below the allowable range in the proportional value measuring step S14, the flow rate inspection step S16 is performed, and the proportional value? The flow rates V1 and V2 of the present hot water flow are all within the allowable range, so that the flow rate velocities V1 and V2 are maintained Return pipes SL and RL within their respective allowable ranges.

The flow rates V1 and V2 may be adjusted in the same manner as described above. Hereinafter, a method of controlling the hot water temperature of the central heating control system 1000 of the present invention will be described with reference to FIG.

In order to measure the temperature of hot water circulating through the supply pipe line SL and the return pipe line RL in the control system 1000 of the present invention, the control unit 500 controls the supply temperature sensor 111 and the recovery temperature A temperature measurement step S21 for measuring the supply temperature T1 and the recovery temperature T2 is performed using the sensor 121. [

In the state where the temperature measurement step S21 has been performed, the controller 500 performs a supply temperature inspection step S22 for determining whether the supply temperature T1 is within an allowable range.

At this time, since the supply temperature T1 may vary depending on factors such as the size of the building B providing the heating and the number of compartments, the controller 500 may be provided with the supply temperature T1 An allowable range is set. Hereinafter, a description will be made with reference to an example in which the temperature of the building section of 1000 m 2 is maintained at an average temperature of 20 to 25 ° C as a reference of the supply temperature T 1 and the recovery temperature T 2 do. With the above criterion, it is preferable that the allowable range of the supply temperature T1 is 40 占 폚 to 90 占 폚, and the permissible range of the recovered temperature T2 is 30 占 폚 or less.

If the supply temperature T1 exceeds the allowable range or is less than the allowable range in step S22, it means that there is an abnormality in the central boiler 100, The control unit 500 performs a notification step S23 of notifying the manager of the abnormality of the supply temperature T1 so that the manager can reset the central boiler 100. [ After the notification step S23 is performed, the temperature measurement step S21 is performed again.

In the supply temperature inspection step (S22), if the supply temperature (T1) is within the allowable range, it is checked whether the recovery temperature (T2) is within the allowable range ).

If the recovered temperature T2 is higher than the allowable range, that is, the set temperature, it means that the thermal energy of the hot water has not been transferred to the building B in the recovery temperature inspection step S24. 500 performs a pressure reduction step S25 for lowering the pressure of the supply and return conduits SL and RL through the pump unit 400. [ The pressure reducing step S25 is performed to lower the pressure of the pipeline so that the hot water is allowed to stay in the building B for a longer time by reducing the speed of the hot water so that the hot water supplies the building B with sufficient heat energy To be supplied.

If the recovery temperature T2 is within the permissible range in the recovery temperature checking step S24, the heat source supplementing step 300 is operated to perform the heat source supplementing step S26 for supplementing the thermal energy to the hot water , So that the central heating control system 1000 of the present invention can be normally operated.

100: Central boiler. 110: Feed flow rate meter.
111: Supply temperature sensor. 120: Recovery flow rate meter.
121: Recovery temperature sensor. 200: Circulating pipe differential pressure valve.
300: Heat source replenishment section. 310: Heat exchange part.
311: Electricity is on. 320: Friction heating section.
321 to 323: First to third friction heating apparatuses. 330: first power supply.
331: Second power supply. 340: Solar heat treatment.
400: pump section. 500: Control section.
S11: Speed measurement step. S12: Feed flow rate test step.
S13: Pressure increase step. S14: Proportional value measurement step.
S15: Proportional value inspection step. S16: Recovery flow rate test step.
S17: Signal generation step. S18: Pressure reduction step.
S19: Maintenance phase. S21: Temperature measurement step.
S22: Supply temperature inspection step. S23: Notification step.
S24: Recovery temperature inspection step. S25: Pressure reduction step.
S26: Heat source replenishment step.

Claims

And supplying hot water to the building through a supply pipe line installed in the central boiler and supplying the hot water to the building through a return pipe extending from the supply pipe line, And the hot water is returned to the boiler through the circulating central heating control system,
A supply flow rate meter installed in the supply line;
A supply temperature sensor installed in the supply line;
A recovered flow rate meter installed in the return pipe;
A recovery temperature sensor installed in the recovery pipe;
A heat source replenishing unit installed in the recovery pipe and capable of supplying thermal energy to the hot water recovered in the recovery pipe; And
And a control unit connected to the supply unit, the supply temperature meter, the recovered flow rate meter, the recovery temperature sensor, the heat source replenishing unit, and the pump unit so as to be able to communicate with each other via wired or wireless communication, , Central heating control system.

[2] The apparatus of claim 1, wherein the heat source replenishing unit comprises: a heat exchange unit having a space formed inside the body for storing water therein and having at least one electric heater installed in the space; A friction heating unit comprising at least one friction heating device; And at least one power supply unit capable of supplying electric energy to the heat exchange unit and the friction heating unit.

A method for controlling a flow rate of a supply pipe and a return pipe through a central heating control system of claim 1,
A step S11 of measuring the supply hot water speed and the recovered hot water speed;
A supply flow rate inspection step (S12) of judging whether the supply hot water velocity measured in the velocity measurement step (S11) is within a set allowable range;
A pressure increasing step (S13) of increasing the pressure inside the supply pipe and the return pipe when the supply water flow rate is determined to be less than the set allowable range in the supply flow rate inspecting step (S12);
In the supplying flow rate checking step S12, if it is determined that the supplied hot water speed is within the set allowable range, a proportional value measuring step (S14) for measuring a proportional value;
A proportional value inspection step (S15) of judging whether the proportional value measured in the proportional value measuring step (S15) is within a set permissible range;
If it is determined in step S12 that the supplied hot water speed has exceeded the set allowable range, or if it is determined in step S15 that the proportional value is located outside the set allowable range, (S16) for determining whether the recovered hot water velocity measured in the velocity measuring step (S11) is within a set allowable range;
A signal generating step (S17) of sending out an abnormal signal visually from the control unit when the recovered flow rate inspection step S16 determines that the recovered hot water speed is less than the allowable range;
The method according to any one of claims 1 to 3, wherein in the recovered flow rate inspection step (S16), the recovered hot water velocity is within an allowable range or exceeds a permissible range, or after the signal generation step (S17) A pressure reducing step (S18) for reducing the internal pressure; And
In the proportional value checking step S15, when the proportional value is within the permissible range, the maintaining step S19 of maintaining the pressure inside the supply pipe and the return pipe is performed to obtain the flow rate of the central heating control system of the present invention And controlling the flow rate of the central heating control system.

A method for controlling a temperature of a supply pipe line and a return pipe line through the central heating control system of claim 1,
A temperature measuring step (S21) of measuring the supply temperature and the recovery temperature;
A supply temperature inspection step (S22) of determining whether the supply temperature measured in the temperature measurement step (S21) is within a set allowable range;
(S23) of sending out an abnormal signal visually from the control unit when the supply temperature is determined to be higher than or less than the set allowable range in the supply temperature inspection step (S22);
(S22), if it is determined that the supply temperature is within the set allowable range, a recovery temperature inspection step (S21) of determining whether the recovery temperature measured in the temperature measurement step (S21) S24);
A pressure reducing step (S25) of reducing the pressure inside the supply pipe and the return pipe when it is determined in the recovering temperature inspection step (S24) that the recovered temperature exceeds the allowable range; And
If it is determined in step S24 that the recovered temperature is within the permissible range, a heat source supplement step S24 for operating the heat source supplement unit 300 is performed to determine whether the temperature of the central heating control system And controlling the temperature of the central heating control system.