JP4699346B2 - Hot water circulation heating system - Google Patents

Description

  The present invention relates to a hot water circulation heating system that supplies hot water heated and generated by a heat source device to a hot water terminal through a hot water circulation circuit.

  Conventionally, a heat source device having a heat exchanger heated by a gas burner, and a hot water terminal device having a radiator connected to the heat exchanger via a hot water circulation circuit, the hot water terminal from the heat source device There is known a hot water circulation heating system that executes a hot water supply operation for supplying hot water of a predetermined temperature to a machine.

  In addition, in order to prevent forgetting to turn off the gas equipment and gas leakage, the gas supply pipe has a state where a gas flow rate higher than a preset flow rate is detected for a preset supply limit time or longer. A gas meter that cuts off the supply of fuel gas is provided (see, for example, Patent Document 1). In such a gas meter, the gas flow rate is divided into a plurality of flow rate ranges, and a supply time limit is set for each flow rate range. The supply restriction time is set to be shorter as the gas flow rate in each flow range is larger.

  When fuel gas is supplied through a gas meter with a supply time limit set in this way, for example, in a hot water circulation heating system provided with a hot water type bathroom heating dryer as a hot water terminal, drying is performed by the bathroom heating dryer. When the operation is performed, the hot water supply operation from the heat source unit to the bathroom heater / dryer may continue for the supply limit time or longer, and the fuel gas may be cut off by the gas meter.

  In this case, the user has to perform the reset operation of the gas meter and then start the drying operation again. Therefore, in order to avoid the fuel gas supply being cut off by the gas meter during the hot water supply operation, the shortest time (the gas flow rate becomes maximum) during the hot water supply operation. It may be possible to temporarily stop the hot water supply operation and extinguish the gas burner before exceeding the flow rate range.

However, extinguishing the gas burner in this way has a disadvantage in that the heating and drying performance of the hot water terminal decreases.
Japanese Patent Publication No. 61-059423

  The present invention has been made in view of the above-described background, and hot water circulation heating that can prevent the gas meter from shutting off the supply of fuel gas during execution of the hot water supply operation by reducing the extinction frequency of the gas burner. The purpose is to provide a system.

  The present invention has been made to achieve the above-described object, and detects the flow rate of the fuel gas, sets a plurality of flow rate ranges and the fuel gas supply time limit in each flow rate range, and sets the fuel gas flow rate. Is connected to a gas burner connected to a gas supply pipe provided with a gas meter for shutting off the supply of the fuel gas when the state belonging to the same flow rate range continues for the supply limit time in the flow rate range or more, and communicates with the hot water circulation circuit Then, a heat exchanger heated by the gas burner, a pump for circulating hot water in the hot water circulation circuit, and operating the pump and supplying hot water of a predetermined temperature to the hot water circulation circuit via the heat exchanger A heat source device having an operation control means for performing a hot water supply operation for controlling the combustion amount of the gas burner, and a hot water terminal device having a radiator in communication with the hot water circulation circuit. E was on the hot water circulation heating system.

And the said heat source machine and the said warm water terminal are provided with the communication means for mutually communicating, When the said heat source machine receives the signal which instruct | indicates the start of the said warm water supply operation from the said warm water terminal, Hot water circulation heating that starts the hot water supply operation by the operation control means and stops the hot water supply operation by the operation control means when a signal instructing the stop of the hot water supply operation is received from the hot water terminal. In the system, the heat source unit is configured to supply the fuel gas to the gas burner when the maximum amount of heat is generated based on the maximum amount of heat of the gas burner from the start of the hot water supply operation until the first predetermined time elapses. Estimate which supply flow rate belongs to the flow range of the plurality of stages, and set a combustion continuation time shorter than the supply limit time in the estimated flow range Combustion continuation time setting means, and combustion continuation time notification means for transmitting the combustion continuation time data to the heat radiating terminal, the hot water terminal receiving the combustion continuation time data When the combustible continuous time has elapsed, a signal instructing the stop of the hot water supply operation is transmitted to the heat source unit, the gas burner is extinguished by the stop of the hot water supply operation, and the second from the transmission A combustion interruption instructing unit is provided that transmits a signal instructing the start of the hot water supply operation to the heat source unit when a predetermined time has elapsed and combusts the gas burner by restarting the hot water supply operation.

According to the present invention, the combustion continuation possible time setting means is configured to determine the maximum heat amount based on the maximum heat amount of the gas burner from the start of the hot water supply operation until the first predetermined time elapses. It is estimated whether the flow rate of the fuel gas supplied to the gas burner when this occurs belongs to which of the plurality of flow ranges. Here, the maximum amount of heat of the gas burner from the start of the hot water supply operation to the elapse of the first predetermined time is the temperature of hot water in the hot water circulation circuit when the hot water supply operation is started. The lower the value, the larger. And after the said 1st predetermined time passes after the said warm water supply operation is started, the combustion of the said gas burner will be stabilized at the level which has decreased gradually. Therefore, the amount of heat of the gas burner does not exceed the maximum amount of heat during the hot water supply operation.
Therefore, it is estimated by the combustion continuation possible time setting means whether the supply flow rate of the fuel gas to the gas burner when the maximum amount of heat is generated belongs to the flow rate range of the plurality of stages, and the supply in the estimated flow rate range By setting the combustion continuation time shorter than the time limit, it is possible to reliably prevent the fuel gas supply from being cut off by the gas burner during the hot water supply operation.
Further, the combustion continuation time notification means transmits the combustion continuation time data to the hot water terminal. And the said combustion interruption instruction | indication means with which the said hot water terminal was equipped is the signal which instruct | indicates the stop of the said hot water supply operation, when the said combustion continuation possible time has passed since the data of the combustion continuation possible time were received. When the second predetermined time has elapsed since the transmission, a signal instructing the start of the hot water supply operation is transmitted to the heat source device, and the gas burner is temporarily stopped by stopping the hot water supply operation. Let fire extinguish.

  Accordingly, the process on the hot water terminal side reduces the frequency of extinguishing the gas burner of the heat source device during the hot water supply operation, and reliably prevents the fuel gas supply from being cut off by the gas meter. can do.

Embodiments relating to the present invention and embodiments of the present invention will be described with reference to FIGS. FIG. 1 is an overall configuration diagram of a hot water circulation heating system according to the present invention, FIG. 2 is an explanatory diagram of a data table provided in a gas meter and a data table provided in a heat source device, and FIGS. FIG. 5 is an operation flowchart of the heat source unit according to the embodiment related to the present invention, and FIG. 6 is a flowchart of the bathroom heating dryer according to the embodiment of the present invention . It is an operation | movement flowchart.

  Referring to FIG. 1, the hot water circulation heating system according to the present embodiment includes a heat source unit 1 and a bathroom heating dryer connected via a hot water circulation circuit 40 (configured by a hot water forward pipe 40a and a hot water return pipe 40b). The fuel gas is supplied from the LP gas cylinder 30 to the heat source device 1 through the gas supply pipe 32 in which the gas meter 31 is installed. The heat source unit 1 and the bathroom heater / dryer 50 are connected to each other via a communication cable 45 so that they can communicate with each other.

  The heat source unit 1 includes a heat exchanger 10 that communicates with the hot water circulation circuit 40, a gas burner 11 that heats the heat exchanger 10, a gas solenoid valve 12 that switches between supplying and shutting off fuel gas to the gas burner 11, and fuel gas to the gas burner 11. The gas proportional valve 13 for changing the supply flow rate of the water, the hot water thermistor 14 for detecting the temperature of hot water near the outlet of the heat exchanger 10, the pump 15 for circulating hot water in the hot water circulation circuit 40, and the overall heat source device 1 A controller 20 for controlling the operation is provided.

  The controller 20 is an electronic unit composed of a microcomputer (not shown), a memory 21 and the like. By causing the microcomputer to execute a control program for the heat source unit 1, the microcomputer controls the operation control means 23 and the combustion continuation. It functions as the possible time setting means 22. Further, the controller 20 includes a communication circuit 24 (corresponding to the communication means of the present invention) for performing communication with the bathroom heater / dryer 50.

  Here, the operation control means 23 operates the pump 15 and controls the combustion amount of the gas burner 11 so that the detected temperature of the tapping hot water thermistor 14 becomes a predetermined temperature (for example, 80 degrees). Execute hot water supply operation to supply hot water. Moreover, the combustion continuation possible time setting means 22 sets the combustion continuation possible time which is the upper limit of the time which makes the gas burner 11 burn continuously. The setting process of the combustion continuation possible time will be described later.

  The bathroom heater / dryer 50 is installed in the bathroom 100 and has a radiator 51 communicating with the hot water circulation circuit 40, an inlet temperature thermistor 52 that detects the temperature of hot water near the inlet of the radiator 51, and hot water to the radiator 51. A thermal valve 53 for switching between supply and shutoff, a controller 60 for controlling the overall operation of the bathroom heating dryer 50, and a remote controller 55 for the user to instruct the operation of the bathroom heating dryer 50 are provided. Further, the bathroom heater / dryer 50 introduces a ventilation fan (not shown) that discharges the air in the bathroom 100 to the outside, and introduces the air in the bathroom 100 to the vicinity of the radiator 51 and also heats the air heated by the radiator 51. A circulation fan (not shown) for feeding into the bathroom 100 is provided.

  The controller 60 is an electronic unit composed of a microcomputer (not shown) or the like. When the microcomputer executes a control program for the bathroom heater / dryer 50, the microcomputer controls the operation control means 61 and the combustion interruption instruction. It functions as means 62 (used in the second embodiment described later). The controller 60 includes a communication circuit 63 (corresponding to the communication means of the present invention) for communicating with the heat source device 1.

  The operation control means 61 selectively executes “ventilation operation”, “heating operation”, and “dry operation” in accordance with the operation of the remote controller 55 by the user. Further, the combustion interruption instruction means 62 instructs the heat source unit 1 to temporarily stop the combustion of the gas burner 11.

  Here, the “ventilation operation” is to operate the ventilation fan without requiring the hot water supply to the heat source unit 1 (the circulation fan is stopped), and the humid air in the bathroom is discharged to the outdoors. In the “heating operation”, the circulation fan is operated by requesting the hot water supply to the heat source unit 1 (the ventilation fan is stopped), and the air in the bathroom 100 is heated to increase the temperature in the bathroom 100. . The “drying operation” is a request for supplying hot water to the heat source unit 1 to operate both the circulation fan and the ventilation fan, and the temperature in the bathroom 100 rises and the humid air in the bathroom 100 is outdoors. To be discharged.

  Next, the gas meter 31 has a flow rate sensor (not shown) for detecting the flow rate of the fuel gas flowing through the gas supply pipe 32 and a memory (not shown) in which data of the data table Md shown in FIG. 2 is stored. ing. In the data table Md, the flow rate of the fuel gas is divided into a plurality of flow rate ranges (sections 1 to 13), and the fuel gas supply limit time in each flow range is set.

  Then, the gas meter 31 shuts off the supply of fuel gas when the flow rate of the fuel gas detected by the flow rate sensor is in the same flow rate range for more than the supply limit time in the flow rate range. Execute. By the “gas flow rate monitoring process”, for example, when the state in which the detected flow rate of the fuel gas by the flow rate sensor belongs to the flow rate range of category 3 continues for 160 minutes or more, which is the supply limit time set for category 3, The gas meter 31 cuts off the supply of fuel gas.

  Here, when the bathroom heater / dryer 50 executes the “drying operation”, the user may set the execution time of the “drying operation” to several hours (for example, 3 hours) by the remote controller 55. In the “drying operation”, since the laundry dried in the bathroom 100 is dried while maintaining the bathroom 100 at a high temperature, the heat amount of the gas burner 11 in the heat source unit 1 (the heat amount generated by the combustion of the gas burner 11) is compared. The fuel gas supply flow rate stably belongs to the same flow rate range.

Therefore, in the hot water circulation heating system of the present embodiment, a process for preventing the supply of fuel gas from being interrupted by the “gas flow rate monitoring process” of the gas meter 31 during the “drying operation” is executed. . Hereinafter, an embodiment related to the present invention of this processing and an embodiment of the present invention will be described.

[Embodiment related to the present invention ] In the embodiment related to the present invention, the process for preventing the supply of fuel gas from being cut off by the "gas flow rate monitoring process" of the gas meter 31 on the heat source unit 1 side. Execute. The heat source unit 1 executes the flowchart shown in FIG. 5, and in STEP 1, the execution of “drying operation” is instructed by the remote controller 55 of the bathroom heating dryer 50, and a signal requesting hot water supply from the bathroom heating dryer 50 When receiving (corresponding to a signal for instructing the start of the hot water supply operation of the present invention), the process proceeds to STEP2.

  STEP2 is a process by the operation control means 23. The operation control means 23 operates the pump 15 and ignites the gas burner 11 to start the hot water supply operation. The subsequent STEP3 to STEP4 are processes by the combustion continuation possible time setting means 22, and the combustion continuation possible time setting means 22 is from STEP2 until the first predetermined time (for example, 3 minutes) elapses from the start of the hot water supply operation. The maximum heat quantity of the gas burner 11 is calculated.

  In the next STEP 4, the combustion continuation possible time setting means 22 applies the maximum combustion amount of the gas burner 11 to the data table Sd shown in FIG. 2 and sets the combustion continuation possible time. For example, when the maximum heat amount is 9000 kcal / hour (the flow rate range is Category 6), the combustion continuation possible time is set to 100 minutes.

  Here, FIG. 3 and FIG. 4 show the amount of fuel gas supplied when the hot water supply operation is started, the temperature of hot water supplied to the bathroom heating / drying machine 50 (hereinafter referred to as “heating temperature”), and the bathroom heating / drying machine. It shows the transition of the temperature of hot water returning from 50 (hereinafter referred to as heating return temperature), with the vertical axis set to temperature and the flow rate of fuel gas, and the horizontal axis set to time.

  FIG. 3 shows a case where the hot water supply operation is started in a state where the temperature of the hot water in the hot water circulation circuit 40 is low (about 27 ° C.), in which a1 is the flow rate of the fuel gas, b1 is the heating return temperature, c1 Is the heating temperature. In this case, the maximum value of the flow rate of the fuel gas is about 400 liters / hour, and then the flow rate of the fuel gas is reduced to about 170 liters / hour in a steady state where the return temperature and return temperature are stable. It is hour.

  On the other hand, FIG. 4 shows a case where the hot water supply operation is started in a state where the temperature of the hot water in the hot water circulation circuit 40 is high (about 60 ° C.), where a 2 is the flow rate of the fuel gas and b 2 is the heating. The return temperature, c2, is the heating temperature. In this case, the maximum value of the flow rate of the fuel gas is about 230 liters / hour, and then the flow rate of the fuel gas is decreased and the flow rate of the fuel gas is about 125 liters / hour in a steady state where the return temperature and return temperature are stable. It is hour.

  As described above, the lower the temperature of the hot water in the hot water circulation circuit 40 when the hot water supply operation is started, the larger the maximum value of the flow rate of the fuel gas until the first predetermined time elapses. And the calorie | heat amount of the gas burner 11 increases / decreases according to the flow volume of fuel gas. Therefore, there is a relationship in which the maximum value of the flow rate of the fuel gas increases until the first predetermined time elapses as the temperature of the hot water in the hot water circulation circuit 40 when the hot water supply operation is started is lower.

  Based on this relationship, the data table Sd in FIG. 2 is slightly more than the supply limit time in the flow rate range to which the flow rate of the fuel gas that generates the maximum heat amount estimated from the maximum heat amount and the maximum heat amount belongs. It corresponds to a short combustion continuation time. The data table Sd is created based on the results of experiments and computer simulations.

  Data of the data table Sd is stored in advance in the memory 21 of the controller 20. For example, for the maximum heat quantity of 9000 kcal / hour of the gas burner 11, it is estimated that the gas flow rate when the maximum heat quantity is generated belongs to the flow rate range of section 6, and combustion is shorter than 120 minutes which is the supply limit time of section 6 100 minutes that can be continued is associated.

  As shown in FIGS. 3 and 4, during the execution of the hot water supply operation, the flow rate of the fuel gas from the start of the hot water supply operation until the first predetermined time elapses. The maximum flow rate is not exceeded. Therefore, the fuel continuation possible time can be reliably set to a time shorter than the supply limit time of the “gas flow rate monitoring process” by the gas meter 31 during execution of the hot water supply operation.

  Subsequent STEPs 5 to 7 are processing by the operation control means 23. In STEP 5, whether or not the combustion time of the gas burner 11 from when the operation control means 23 started the hot water supply operation start in STEP 2 is longer than the combustion continuation possible time. Determine whether. Then, when the combustion time of the gas burner 11 becomes equal to or longer than the combustion continuation possible time, the process proceeds to STEP 6 and the operation control means 23 extinguishes the gas burner 11 and stops the hot water supply operation.

  In the next STEP 7, the operation control means 23 takes into consideration the time until the gas meter 31 recognizes that the detected flow rate of the fuel gas has become 0, and a second predetermined time set slightly longer than that time. Wait for (for example, 2 minutes) to elapse and return to STEP2. Then, the operation control means 23 resumes the hot water supply operation.

  Thus, when the combustion time of the gas burner 11 is equal to or longer than the combustion continuation possible time in STEP 5 (before the supply limit time of the gas meter 31 elapses), the hot water supply operation is stopped in STEP 6 and the gas burner 11 is temporarily suspended. By extinguishing the fire, it is possible to prevent the supply of fuel gas from being shut off by the “gas flow rate monitoring process” of the gas meter 31.

  As described above, the combustion continuation possible time is the hot water circulation circuit at the start of the hot water supply operation based on the maximum heat amount of the gas burner after the start of the hot water supply operation until the first predetermined time elapses. It is set shorter as the temperature of hot water in 40 is lower. Therefore, compared with the case where the combustion continuation possible time is uniformly set to the time by the section 13 having the maximum gas flow rate shown in FIG. 2, the frequency at which the hot water supply operation is stopped during the execution of the drying operation can be reduced. It is possible to suppress a decrease in drying capacity due to the stop of the hot water supply operation.

In the embodiment of the embodiment of the present invention] The present invention, the heat source device 1 and bathroom heater dryer 50 cooperate the supply of fuel gas is blocked by the "gas flow monitoring process" of the gas meter 31 A process for preventing the problem is executed. The heat source unit 1 is instructed to execute the “drying operation” by the remote controller 55 of the bathroom heating / drying machine 50, and requests a warm water supply from the bathroom heating / drying machine 50 (a signal that instructs the start of the hot water supply operation of the present invention). The same processing as STEP 2 to STEP 4 in FIG. 5 described above is executed.

  Thereby, the hot water supply operation is started by the operation control means 23, and the gas burner 11 enters the combustion state. Further, the combustion continuation possible time setting means 22 sets the combustion continuation possible time based on the maximum heat quantity of the gas burner 11. Then, the combustion continuation possible time setting means 22 transmits data of the set combustion continuation possible time to the bathroom heating dryer 50. In this way, the configuration in which the combustion continuation possible time setting unit 22 transmits data of the combustion continuation possible time to the bathroom heating dryer 50 corresponds to the combustion continuation possible time notification unit of the present invention.

  The controller 60 of the bathroom heater / dryer 50 transmits a signal requesting hot water supply to the heat source unit 1 and then executes the flowchart shown in FIG. 6 by the combustion interruption instructing unit 62 during the “drying operation”. When the combustion interruption instructing means 62 receives the data of the combustion continuation possible time in STEP10 of FIG. 6, the process proceeds to STEP11 and starts measuring time.

  Then, in the following STEP 12, it is determined whether or not the measured time (elapsed time from when the data of the combustion continuation possible time is received) is equal to or longer than the combustion continuation possible time. Sometimes go to STEP13. In STEP 13, the combustion interruption instruction means 62 transmits a hot water supply stop signal (corresponding to a signal for instructing stop of the hot water supply operation of the present invention) to the heat source unit 1. As a result, on the side of the heat source unit 1 that has received the stop signal, the operation control means 23 extinguishes the gas burner 11 and stops the hot water supply operation.

  Then, in the next STEP 14, the combustion interruption instruction means 62 takes into account the time until the gas meter 31 recognizes that the detected flow rate of the fuel gas has become 0, and is set to be slightly longer than that time. After a predetermined time (for example, 2 minutes) elapses, the process proceeds to STEP15.

  In STEP 15, the combustion interruption instructing means 62 transmits a warm water supply request signal to the heat source unit 1 and returns to STEP 10. On the side of the heat source unit 1 that has received the request signal for supplying hot water, the operation control means 23 starts the hot water supply operation. Thereby, supply of the warm water to the bathroom heating dryer 50 is restarted. Then, the processing from STEP 10 is executed again.

  In this way, when the elapsed time from the reception of the combustion continuation possible time data in STEP 12 becomes equal to or longer than the combustion continuation possible time (before the supply limit time of the gas meter 31 elapses), the hot water is supplied in STEP 13. A supply stop signal is transmitted to the heat source unit 1, thereby stopping the hot water supply operation and temporarily extinguishing the gas burner 11, whereby the fuel gas supply is shut off by the “gas flow rate monitoring process” of the gas meter 31. This can be prevented.

When according to an embodiment of the present invention, similar to the embodiment related to the present invention described above, the combustion sustainable time, from the start of the hot water supply operation until a first predetermined time has elapsed Is set shorter as the temperature of hot water in the hot water circulation circuit 40 at the start of the hot water supply operation is lower, based on the maximum amount of heat of the gas burner in between. Therefore, it is possible to reduce the frequency at which the hot water supply operation stops during the execution of the drying operation, and it is possible to suppress a decrease in the drying capacity due to the stop of the hot water supply operation.

In the embodiment related to the present invention and the embodiment of the present invention , the case where the “drying operation” is executed has been described as an example, but the process when the “heating operation” is executed is also the same.

Further, in the embodiment related to the present invention and the embodiment of the present invention , the bathroom heating dryer 50 is shown as the hot water terminal of the present invention, but the hot water radiator such as a clothes dryer or a hot air heater. The present invention can be applied to any hot water terminal that uses as a heat source.

In the embodiment related to the present invention and the embodiment of the present invention , the combustion continuation possible time setting means 22 is a data table Sd prepared in advance with the maximum amount of heat of the gas burner 11 when the hot water supply operation is started. Although the combustion continuation time is set by applying to the above, the maximum heat amount of the gas burner when, for example, the hot water supply operation is started, and the supply flow rate of the fuel gas to the gas burner when the maximum heat amount occurs are determined by other methods. A correlation equation is prepared in advance, the flow rate of the fuel gas corresponding to the maximum heat amount of the gas burner is estimated according to the correlation equation, the combustion continuation possible time is set from the supply limit time in the flow rate range to which the estimated fuel gas flow rate belongs, etc. Thus, the combustion continuation possible time may be set.

The whole block diagram of the warm water circulation heating system of the present invention. Explanatory drawing of the data table with which the gas meter was equipped, and the data table with which the heat source machine was equipped. The graph which showed transition of the temperature of circulating water at the time of hot water supply operation execution, and the supply flow rate of fuel gas. The graph which showed transition of the temperature of circulating water at the time of hot water supply operation execution, and the supply flow rate of fuel gas. The operation | movement flowchart of the heat-source equipment in embodiment relevant to this invention . The operation | movement flowchart of the bathroom heating dryer in embodiment of this invention .

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Heat source machine, 10 ... Heat exchanger, 11 ... Gas burner, 14 ... Hot water thermistor, 15 ... Pump, 20 ... (Heat source machine) controller, 22 ... Combustion continuation time setting means, 23 ... (Heat source machine) operation Control means, 24 ... communication circuit (of heat source machine), 31 ... gas meter, 32 ... gas supply pipe, 40 ... warm water circulation circuit, 45 ... communication cable, 50 ... bathroom heater / dryer, 51 ... heat radiator, 52 ... inlet temperature Thermistor, 55 ... remote control, 60 ... controller (for bathroom heating dryer), 61 ... operation control means (for bathroom heating dryer), 62 ... combustion stop instruction means, 63 ... communication circuit (for bathroom heating dryer)

Claims (1)

The flow rate of fuel gas is detected, the flow range of multiple stages and the fuel gas supply limit time in each flow range are set, and the state where the fuel gas flow rate belongs to the same flow range is the supply limit in the flow range A gas burner connected to a gas supply pipe provided with a gas meter that shuts off the supply of fuel gas when the fuel gas supply is continued for a period of time, a heat exchanger that is heated by the gas burner in communication with the hot water circulation circuit, A pump for circulating hot water in the circuit, and a hot water supply operation for operating the pump and controlling a combustion amount of the gas burner so that hot water of a predetermined temperature is supplied to the hot water circulation circuit via the heat exchanger. A heat source machine having an operation control means to perform;
A hot water circulation heating system comprising a hot water terminal having a radiator in communication with the hot water circulation circuit,
The heat source device and the hot water terminal include a communication means for communicating with each other,
The heat source device starts the hot water supply operation by the operation control means when receiving a signal for instructing the start of the hot water supply operation from the hot water terminal, and the hot water supply operation from the hot water terminal In the hot water circulation heating system that stops the hot water supply operation by the operation control means when a signal instructing to stop the operation is received,
The heat source unit has a supply flow rate of fuel gas to the gas burner when the maximum amount of heat is generated based on the maximum amount of heat of the gas burner from the start of the hot water supply operation until the first predetermined time elapses. Combustion continuation time setting means for estimating which of the plurality of stages of flow ranges belongs, and setting a combustion continuation time shorter than the supply limit time in the estimated flow range;
Combustion continuation time notification means for transmitting the combustion continuation time data to the heat radiating terminal,
The hot water terminal transmits a signal instructing to stop the hot water supply operation to the heat source device when the combustion continuable time has elapsed from the time when the combustion continuable time data is received, and the hot water supply The gas burner is extinguished by stopping the operation, a signal instructing the start of the hot water supply operation is transmitted to the heat source unit when a second predetermined time has elapsed from the transmission, and the gas burner is restarted by restarting the hot water supply operation. A hot water circulation heating system, characterized by comprising combustion interruption instruction means for combusting water.

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