JP4140484B2 - Hot water heating system and air vent operation control method for hot water heating system - Google Patents

Description

  The present invention is a hot water heating system in which hot water is circulated through a circulation pipe between a heat source machine and each heating terminal, and an emptying operation control method for removing air that may enter from the circulation pipe, The present invention relates to a hot water heating system, and in particular, to a technology that can optimize the air bleeding operation.

  Conventionally, as a hot water heating system, a heat source device incorporating an open hot water tank and a circulation pump and a heating terminal (for example, a floor heating terminal) installed in each room or the like are connected by a circulation pipe, and the circulation pump is operated. After heating the hot water taken out from the hot water tank and supplying it to each heating terminal, the hot water after the heat radiation returned from each heating terminal to the hot water tank is heated again and supplied to each heating terminal. Things are generally known. The hot water tank is usually provided with an electrode rod for detecting the low water level and the high water level. When the water level in the hot water tank falls below the low water level due to evaporation or the like, water is automatically replenished from the outside to the high water level.

  In such a hot water heating system, since the circulation pipe is composed of an oxygen-permeable synthetic resin pipe such as a PE (polyethylene) pipe, the heating terminal is installed on the second or third floor (so-called floor). If it is installed at a position higher than the heat source machine installed on the first floor, such as the upper installation), the hot water in the circulation pipe extending to the floor tends to have a negative pressure in the heating operation stop (circulation pump stop) state As a result, oxygen may be absorbed from the outside through the wall of the circulation pipe, and air may enter the inside of the circulation pipe to generate an air pool. In order to remove such intrusion air, conventionally, an air venting operation is performed.

  That is, in Patent Document 1, every time the heating operation stop time elapses over a predetermined time, only the circulation pump is operated to circulate the non-heated hot water, thereby leading the air to the hot water tank. It describes that air venting operation control to escape to space is performed. Further, in Patent Document 2, the circulation pump is operated every time a predetermined time (for example, 720 hours) elapses so that air is vented in the same manner as described above.

JP-A-6-109265 JP-A-11-108378

  However, in the air venting operation in the conventional hot water heating system, wasteful energy consumption is caused for the air venting operation.

  That is, in the conventional technology, it is assumed that air intrusion may occur if a predetermined time elapses regardless of whether air intrusion occurs or not. Since the circulating operation by operation (air venting operation) is performed uniformly, it is effective if air intrusion actually occurs, but if the air intrusion does not actually occur, the energy required for the air venting operation is It will be wasted.

  In addition, the installation location of the above heating terminals varies from site to site (building) where the hot water heating system is installed and is not uniform. Therefore, there are a large number of heating terminals installed on the floor and a circulation circuit (circulation) for connecting to them. If the number of pipes) increases correspondingly, the risk of air intrusion increases, while the number of heating terminals installed on the floor is small (for example, one) or there is no heating terminal installed on the floor, and the heat source machine If the heating terminal is installed only on the same floor, the risk of air intrusion is reduced. Despite the difference in the installation status of such heating terminals, if the air venting operation is performed uniformly, the energy required for the air venting operation is unnecessarily consumed as described above. .

  On the other hand, if the time interval for performing the air venting operation is too long in spite of the fact that air intrusion has occurred, it will cause a large amount of overflow and a significant drop in water level following the start of heating operation. If the operation is not performed, it may be erroneously determined that water leakage has occurred despite the fact that water leakage has not occurred due to the occurrence of air pockets. In other words, when the water level in the hot water tank drops below a predetermined level due to natural evaporation, etc., rehydration control for automatically refilling water is started. If this is the case, it may be possible to automatically determine that water leakage has occurred in any of the circulation circuits and perform control to stop the heating operation. However, if air intrusion occurs, the water level of the hot water tank may rise corresponding to the amount of intrusion air and overflow, but when the intruding air reaches the hot water tank due to the start of heating operation, the intruding air As a result of being released from the tank, the water level in the hot water tank is lowered and the automatic water replenishment is started. For this reason, although it is not the occurrence of water leakage but the water level is lowered due to air intrusion, it may lead to an erroneous determination that water leakage has occurred.

  Furthermore, although the number of heating terminals connected to the heat source machine varies depending on the installation site, the conventional air venting operation circulates to all the circulation circuits for all the heating terminals. It takes a long time for automatic circulation, causing the user to feel distrust and anxiety, or piping resistance from all the circulation circuits (passage resistance during circulation), and it depends on the location of the heating terminal. Even if the air venting operation is executed without promoting the flow of the intruding air by the flow, there is a disadvantage that the air cannot be easily promoted to be discharged.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a hot water heating system and an air vent operation control method thereof that can optimize the air vent operation according to the actual installation status of the heating terminal. It is to provide.

  In order to achieve the above object, a heat source device having a hot water tank for storing circulating hot water and at least one heating terminal are connected by a circulation circuit and heated from the heat source device through the circulation circuit by operation of a circulation pump. For the hot water heating system configured to perform heating operation by circulatingly supplying the heated water to the heating terminal, the circulation pump is operated at a set time interval in the heating operation stop state so that the circulation circuit is not heated. The following various inventions have been completed for an air venting operation control method of a hot water heating system that performs air venting operation control for discharging air in the circulation circuit from the hot water tank by circulating the hot water.

  In the first invention, the hot water tank is provided with a water level detecting means for detecting the water level in the hot water tank, and when the air venting operation control is started, the fluctuation in the water level in the hot water tank is detected by the water level from the water level detecting means. Monitor based on the detection information, and if there is a water level drop fluctuation in the time lapse range from the start of the air vent operation control to the initial stage of operation, the set time interval for executing the next air vent operation control will be shortened and the water level lowered If there is no fluctuation, the set time interval for executing the next air vent operation control is changed and set longer (Claim 1).

  In the case of the first aspect of the invention, if there is a fluctuation in the water level in the time lapse range of the initial stage of operation, it is determined that there is a risk of air intrusion and the set time interval is changed to be shorter from the next time. As a result, the air venting operation control is executed at an interval shorter than the standard setting time interval that is initially set, and the intrusion air is discharged at an early stage. On the other hand, if there is no fluctuation in the water level, it is determined that air intrusion has not occurred, the set time interval from the next time is changed longer, and the air venting operation control is executed at a longer interval. As a result, the air vent operation control is executed in a shorter cycle if the air intrusion is likely to occur, while the air vent operation control is executed in a longer cycle if the air intrusion is difficult to occur. It is possible to perform the air bleeding operation at time intervals (cycles) according to the situation at the site. For this reason, useless energy consumption for air venting operation is avoided while performing air venting by air venting operation control periodically. Therefore, the standard setting time interval of the initial setting is changed in length according to the situation of the installation site of the hot water heating system, and optimal air venting operation control according to the situation of the installation site is realized.

  Here, the “time lapse range from the start of the air vent operation control to the initial stage of operation” is a time lapse range for determining whether air intrusion has occurred, for example, at a predetermined set time interval. The time it takes for the circulating pump to be activated and the hot water to start circulating in the circulation circuit when it arrives, or if a thermal valve is installed in the circulation circuit from the heat source unit to the heating terminal, In addition to the time required for opening the valve, add the time required for all of the ingress air to flow through the circulation circuit between each heating terminal connected to the heat source unit and to be released from the hot water tank. It means the range until the total time passed. The time required for the intrusion air to flow along with the circulating hot water in the circulation circuit and reach the hot water tank is determined based on the extension length of the circulation circuit to the heating terminal, the number of heating terminals, etc. What is necessary is just to set according to an installation condition. The above interpretation is the same in the following other inventions.

  In the case of the first invention, when there is a fluctuation in the water level in the time lapse range, the set time interval can be changed and set shorter as the fluctuation in the water level is larger ( Claim 2). The greater the fluctuation in the water level, the greater the amount of air intrusion or the greater the degree of occurrence, so in this way, the greater the amount of air intrusion or the higher the degree of air intrusion, the shorter the set time interval. Then, the air venting operation control is executed earlier, and the invaded air can be discharged earlier. As a result, more optimal air venting operation control can be realized according to the situation of the installation site.

  In the second aspect of the invention, the water level detecting means for detecting the water level in the hot water tank is provided in the hot water tank, and the water level fluctuation information in the hot water tank is detected from the water level detecting means when the air vent operation control is started. The above set time interval for executing the next air venting operation control is changed to be shorter when the water level drop more than the set water level difference is detected in the time lapse range from the start of the air venting operation control to the initial operation stage. (Claim 3).

  In the case of the second aspect of the invention, if a water level drop equal to or greater than the set water level difference is detected in the time lapse range of the initial stage of operation, it is determined that air intrusion has occurred reliably, and the set time interval has reached that time. The air venting operation control is executed in a shorter cycle by changing the setting shorter than the set one. For this reason, if air intrusion is likely to occur according to the situation at the installation site, the set time interval for reliably detecting the air intrusion and executing the air vent operation control can be changed to be shorter. As a result, it is possible to realize more optimal air venting operation control corresponding to the situation of the installation site, and it is possible to discharge intrusion air more reliably. The “set water level difference” may be determined based on the size of the hot water tank, the intrusion air amount assumed from the extension length or surface area of the so-called floor installation portion of the circulation circuit, and the like.

A third invention relates to an air vent operation control method for a hot water heating system including two or more heating terminals, and individually circulates a heat source device including a hot water tank storing hot water for circulation and two or more heating terminals. In a heating operation stop state, for a hot water heating system that is connected by a circuit and configured to perform heating operation by circulatingly supplying hot water heated from the heat source device through the circulation circuit by operation of a circulation pump to the heating terminal. An air venting operation of a hot water heating system that performs an air vent operation control for operating the circulation pump to circulate unheated hot water in the circulation circuit at every set time interval, thereby discharging air in the circulation circuit from the hot water tank. The following specific items were prepared for the control method. That is, the air venting operation control is individually executed for each of the two or more heating terminals, the water level detecting means for detecting the water level in the hot water tank is provided in the hot water tank, and the air venting operation control is performed for each heating terminal. the drawdown information about the water level drop in the hot water tank to collect on the basis of the water level detection information from the water level detecting means in time ranging from the start of the operation initial stage of the air vent operation control when start, and individual heating Based on the water level lowering information collected for each terminal, the set time interval for executing the next air vent operation control is individually changed for each heating terminal, and the air vent operation control is performed for each set time interval after the change setting. This is performed for each heating terminal (claim 4).

  In the case of this third invention, every time the air venting operation control of each heating terminal is started, the water level lowering information in the time lapse range of the initial stage of operation is collected and set based on the collected water level lowering information for each heating terminal. The time interval is changed for each heating terminal, and the air venting operation control is individually executed for two or more heating terminals for each set time interval that is changed and set individually for each heating terminal. For this reason, even if the number, type, and installation location of the heating terminals differ from installation site to installation site, the ease and difficulty of air intrusion are determined for each heating terminal based on the water level lowering information. As a result of changing the set time interval for each heating terminal based on the above, the optimum air venting operation is executed according to the situation for each heating terminal.

  Next, as means for achieving the above object by means different from the air venting operation control method for the hot water heating system described above, in the fourth invention, a heat source machine comprising a hot water tank for storing hot water for circulation, and at least one The heating terminal is connected to the heating terminal by a circulation circuit, and the heating operation is performed by circulatingly supplying hot water heated from the heat source device through the circulation circuit to the heating terminal through the circulation circuit, and the heating operation is stopped. An air bleed operation control means for performing air bleed operation control for operating the circulation pump at set time intervals and circulating unheated hot water in the circulation circuit to discharge air in the circulation circuit from the hot water tank. For the hot water heating system equipped with the above, the set time interval at which the air vent operation control is executed is set to be changeable It was further comprising a change unit (claim 5).

In the case of this 4th invention, if the said time interval change means is comprised by an automatic control system, the set time interval will be determined in advance based on the detection signal from the water level detection means in each of the above first to third inventions. Ri manner or is capable Na changing stepwise change value, serviceman to perform the test operation before installers or used by on SL time interval changing means and modifiable hardware configuration by a manual operation It is possible to change and set the set time interval for executing the air vent operation control according to the situation of the installation site, and in any case, the air exhaust operation control can be optimized according to the situation of the installation site.

In addition, in the fourth aspect of the invention, in order to configure the time interval changing means in hardware, the heat source apparatus includes a controller including the air vent operation control means, and the time interval changing means The operation means attached to the heating terminal is connected to the controller so as to be able to send an operation signal for setting the set time interval of the air vent operation control by the air vent operation control means to be changeable. was employed (claim 5). Thereby , the setting time interval of the air vent operation control for the heating terminal provided with the operation means can be changed by the setting operation of the operation means. For this reason, the setting time interval can be changed and set at the time of installation, test operation, or even after the start of use according to the actual installation location of the heating terminal at the installation site.

In addition, as a reference technique when the time interval changing means in the fourth invention is configured in hardware, there are the following dip switches or a plurality of connection terminals, and a combination of these and the above operating means may be adopted. Is possible. That is, in the case of a dip switch, it is assumed that the heat source device includes a controller configured to include the air vent operation control means, and the time interval changing means is provided in the controller and is controlled by the air vent operation control means. It consists of a dip switch that can be set to change the set time interval of the air vent operation control. In this case, the set time interval for executing the air vent operation control is changed by the switching operation of the dip switch. Such a DIP switch may be provided in the controller by one or two or more, preferably the number that can connect the heating terminal. Thereby, even if the number of the heating terminals connected to the heat source machine is different for each installation site, the setting time interval can be changed and set by the switching operation of the dip switch in any case. In the case of a plurality of connection terminals, a controller configured to include the air vent operation control means as the heat source device is provided, and the time interval changing means is provided in the controller and the heating terminal. And a plurality of connection terminals for inputting / outputting control signals between them. Further, as the plurality of connection terminals, a plurality of different time values are set in advance as set time intervals of the air vent operation control by the air vent operation control means, and the heating terminal is connected to the heating terminal. the set time interval for the terminal shall be the configuration which imparts to the air venting operation control means. In this case, by selecting the connection terminal to be connected according to the actual installation location of the heating terminal at the installation site, the set time interval of the air vent operation control executed for the heating terminal can be changed and set. . As a result, when installing a heating terminal, depending on the installation location of the heating terminal, for example, select and connect to a connection terminal with a short time interval or a connection terminal with a long time interval set It is possible to change and set a time interval suitable for the heating terminal.

  As described above, according to the air vent operation control method of the hot water heating system according to claim 1 or claim 2, when the air intrusion is likely to occur, the air vent operation control is executed in a shorter cycle. The air venting operation can be executed at an optimal time interval according to the situation of the installation site, such that the air venting operation control is executed at a longer cycle if the intrusion hardly occurs. For this reason, while the set time interval at which the air vent operation control is executed can be optimized according to the situation at the installation site, wasteful energy consumption for the air vent operation can be avoided.

  In particular, according to claim 2, the larger the amount of air intrusion or the higher the degree of air intrusion, the shorter the set time interval can be changed. Can be discharged earlier. As a result, it is possible to achieve more optimal air venting operation control according to the situation of the installation site.

  According to the air venting operation control method of the hot water heating system according to claim 3, if a water level drop more than the set water level difference is detected in the initial stage of operation, it is determined that air intrusion has occurred, and the set time interval is further increased. Since the air venting operation control is executed in a shorter cycle by changing it to be shorter, if air intrusion is likely to occur according to the situation at the installation site, the air intrusion operation control is executed by reliably detecting the air intrusion. It is possible to change the set time interval to be shorter. Thereby, more optimal air venting operation control can be realized corresponding to the situation of the installation site, and more reliable intrusion air can be discharged.

  According to the air vent operation control method of the hot water heating system of claim 4, the set time interval is individually changed for each heating terminal based on the water level lowering information collected in the initial operation stage, and the set time interval is changed and set. Since the air venting operation control is executed individually for two or more heating terminals, air intrusion occurs at each heating terminal even if the number, type and installation location of the heating terminals are different at each installation site. Ease of occurrence / difficulty is determined based on the water level drop information, and based on this, the setting time interval for each heating terminal can be changed and set, resulting in optimal air venting operation according to the situation of each heating terminal Can be executed.

According to the hot water heating system of the fifth aspect , the set time interval for executing the air venting operation control can be changed and set according to the situation of the installation site by automatic control or by manual operation of an installer or the like. Thus, the air vent operation control can be optimized according to the situation of the installation site.

In addition , the setting time interval of the air vent operation control for the heating terminal to which the operation means is attached can be changed and set by the setting operation of the operation means, and it can be set according to the actual installation location of the heating terminal at the installation site. The set time interval can be changed and set during the test operation or even after the start of use.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1 shows a hot water heating system in which an embodiment of the present invention is implemented. 2 is a heat source unit installed on, for example, the first floor of a building, 4 is on the second or third floor above the heat source unit 2, for example. A so-called floor-mounted heating terminal installed, 5 is a heating terminal installed on the same floor as the heat source unit 2, and 6 is a controller. In addition, in this 1st Embodiment, although the hot water heating system of the basic composition with which one heating terminal installed on the floor was installed is illustrated, two or more heating terminals installed on the floor are installed, and these two or more heating terminals are installed. A heating terminal may be connected to the heat source unit 2 by an individual circulation circuit to constitute a hot water heating system.

  The heat source unit 2 has an open-type hot water tank 21 in which a return path 20 communicates with the bottom and stores hot water for circulation (hereinafter referred to as “hot water”), and hot water in the hot water tank 21 is taken out and pumped through the path 22. Circulating heat pump 23, a heat exchanger 25 for heat exchange heating by the combustion heat of the combustion burner 24 while hot water pumped by the circulation pump 23 passes, and hot water heated by the heat exchanger 25 are supplied. A forward passage 26 and a water replenishing passage 28 for replenishing the warm water tank 21 from the outside via a water replenishing electromagnetic valve 27 are provided. The upstream end of the replenishing water passage 28 is connected to an external tap water supply pipe or the like, and the replenishing electromagnetic valve 27 is opened to replenish water to the hot water tank 21 based on the water pressure or the like.

  The hot water tank 21 is provided with a rod-shaped electrode (H electrode) 29 for detecting a set high water level and a rod-shaped electrode (L electrode) 30 for detecting a set low water level. The H electrode 29 or the L electrode 30 outputs an ON signal to the controller 6 when hot water is in contact, and outputs an OFF signal when the hot water becomes non-contact, and an ON signal is output. If the water level is changed from ON to OFF, it is detected that the water level in the hot water tank 21 is lower than the predetermined water level. These H electrode 29 and L electrode 30 constitute water level detection means. At the start of use of the hot water heating system, the replenishing electromagnetic valve 27 is opened until water is filled in each circulation circuit and the hot water tank 21, which will be described later, until the H electrode 29 changes from OFF to ON in the hot water tank 21. That is, use is started in a state where water is filled up to the set high water level.

  Further, a forward connection head 31 having a predetermined number of branch ports is connected to the downstream end of the forward path 26 of the heat source unit 2, and a return connection having a predetermined number of branch ports is connected to the upstream end of the return path 20. The head 32 is connected. The upstream ends of the forward pipe 41 for the heating terminal 4 and the forward pipe 51 for the heating terminal 5 are individually connected to the forward connection head 31, and the return pipes 42 and 52 from the heating terminal 4 or 5 are individually connected to the above. It is connected to the return connection head 32. Each branch port of the forward connection head 31 is provided with a thermal valve for opening and closing (not shown). For example, when the heating operation of the heating terminal 4 installed on the floor is started, a command signal from the controller 6 is used. The corresponding thermal valve is opened, and the hot water heated from the outgoing path 26 to the outgoing pipe 41 is circulated and supplied. And the hot water after radiating heat in the heating terminal 4 is returned to the hot water tank 21 through the return pipe 42, the connection head 32, and the return path 20. Accordingly, the return connection head 32, the return path 20, the take-out path 22, the forward path 26, and the forward connection head 31 are shared, and the circulation line of the heating terminal 4 is configured by the forward piping 41 and the return piping 42. And the return pipe 52 constitutes a circulation circuit of the heating terminal 5. In other words, an independent system circulation circuit is formed for each heating terminal 4 and 5, and the forward piping 41 and 51 and the return piping 42 and 52 have oxygen permeability and may intrude air from the outside. It is composed of synthetic resin piping such as (polyethylene) piping.

  The heating terminals 4 and 5 are configured by various types such as a floor heating terminal, a fan convector, or a bathroom dryer. In this embodiment, the heating terminals 4 and 5 are both configured by a floor heating terminal.

  The controller 6 is composed of a microcomputer equipped with an MPU and the like, and based on an operation command or the like input by a user to remote controllers 40 and 50 attached to the heating terminals 4 and 5, heating operation control, supplementary water control and air venting are performed. Various controls such as operation control are performed. Specifically, the controller 6 is, as shown in FIG. 2, a heating operation control unit 61, a water replenishment control unit 62, an abnormality determination processing unit 63, and an air bleed operation control means as an air bleed operation control means for performing the air bleed operation control. Unit 64 and a time interval change processing unit 65 as time interval changing means.

  When the user turns on the heating switch of the remote controller 40, for example, the heating operation control unit 61 receives the output of the ON command signal and starts the heating operation of the heating terminal 4. First, after operating the circulation pump 23, the combustion burner 24 is burned. Then, the corresponding thermal valve of the forward connection head 31 is opened. Until this thermal valve is opened, the heat source machine 2 is circulated from the forward path 26 to the return path 20 through a bypass path (not shown). When the thermal valve is opened, the hot water in the hot water tank 21 is sent to the heat exchanger 25 through the take-out path 22, and the heated hot water is heated through the outgoing path 26, the outgoing connection head 31 and the outgoing pipe 41. The hot water that has been sent to the terminal 4 and radiated from the heating terminal 4 is returned to the hot water tank 21 through the return pipe 42, the return connection head 32, and the return path 20, and such hot water circulation is repeated. .

  In order to cope with a decrease in the amount of hot water due to natural evaporation or the like from the hot water tank 21, the water replenishment control unit 62 attempts to replenish water by water replenishment control when the water level in the hot water tank 21 decreases. Specifically, if the L electrode 30 changes from ON to OFF, that is, if the water level in the hot water tank 21 falls below a set low water level, the supplementary electromagnetic valve 27 is opened in response to the detection signal. The operation control is performed to replenish water into the hot water tank from the water replenishment path 28, and this water replenishment is continued until the H electrode 29 changes from OFF to ON, that is, until the water level in the hot water tank 21 becomes equal to or higher than the set high water level. In response to the ON signal output of 29, the replenishing electromagnetic valve 27 is controlled to be closed and the replenishment is finished.

  The abnormality determination processing unit 63 is started by a counter L for determining whether or not air intrusion has occurred, a counter N for determining whether or not water leakage (small amount of leakage) has occurred, and start of the air venting operation. A timer for measuring the elapsed time from the start of the air vent operation control, and a timer for measuring the elapsed time from the previous water replenishment after starting the previous water replenishment control, including the ON / OFF change of the L electrode 30 and the H electrode Based on the water level fluctuation information by the change of OFF / ON of 29, it is determined whether or not air intrusion has occurred (air intrusion determination) and whether or not water leakage has occurred (leakage determination). Based on this, various types of corresponding processing are performed. In addition, the above-mentioned water leak determination is divided into two types, a small amount leak determination whether or not a small amount of water leaks gradually and a large amount leak determination whether or not a large amount of water leaks at a time. It is like that.

  In addition, the abnormality determination processing unit 63 is preset with two types of time values, a set time value for air intrusion determination and a set time value for water leakage determination. Specifically, a set time value for water leakage determination Is divided into a set time value for determining a small amount of leak (for example, 64 hours from the previous replenishment) and a set time value for determining a large amount of leak (for example, 2 minutes from the start of the current replenishment). The set time value for air intrusion determination is a time value that defines the time lapse range of the initial stage of operation set for air intrusion determination from the start of air release operation control described later. If the circulation pump 23 or the like is activated and air has entered from the circulation circuit of the heating terminal subject to air venting operation control, the time that all of the intrusion air will reach the hot water tank 21 together with the hot water circulation flow A value (for example, 10 minutes) is set.

  When the state where the heating operation is stopped continues for a predetermined time or longer, the air venting operation control unit 64 operates only the circulation pump 23 every set time interval, that is, the combustion burner 24 does not perform the combustion operation and only performs the hot water circulation. In this way, hot water in a non-heated state is circulated to the target heating terminals 4 and / or 5 and enters the circulation circuit (particularly, the outgoing pipes 41 and 51 and the return pipes 42 and 52). The air that may be allowed to flow to the hot water tank 21 is discharged from the hot water tank 21 to the outside. Such air venting operation control is performed individually for each of the heating terminals 4 and 5. As the set time interval, a standard time value (for example, 720 hours) is initially set for each of the heating / heating terminals 4 and 5 in advance.

  The time interval change processing unit 65 changes the set time interval at which the air vent operation control is executed based on the air intrusion determination result by the abnormality determination processing unit 63. That is, as described later, the set time intervals of the heating terminals 4 and 5 are individually changed and set based on the water level lowering information in the hot water tank 21 in the time lapse range from the start of the air vent operation control to the initial operation stage. ing. This change setting is changed from the above standard time values to time values that are set in stages as those on the shortening side and the extension side (for example, 360 hours and 240 hours on the shortening side, and 960 hours and 1200 hours on the extension side). It is supposed to be set. However, the present invention is not limited to this, and the change setting may be performed based on a predetermined increase / decrease ratio.

  Next, various controls and processes performed by the controller 6 will be described with reference to the flowchart of FIG.

  First, when the set time interval for the current time set up to the previous time arrives due to the passage of time, the air bleeding operation control by the air bleeding operation control unit 64 is started. First, the operation of the circulation pump 23 is started, and at the same time the timer counts. Start (step S1). Note that, in this air vent operation start stage, the operation stop state continues for the set time interval (for example, 720 hours) from the end of the previous air exhaust operation control or for a very long time after the end of the previous heating operation use. The water level up to the set high water level is maintained in the hot water tank 21 by the previous air venting operation control or heating operation control, unless the water level itself is lowered due to natural evaporation from the inside of the hot water tank 21. The H electrode 29 is in an ON state. It should be noted that the air vent operation control start condition is that the water level is at least the set low water level or more and the L electrode 30 is in the ON state even if it is left in an operation stop state for an exceptionally long time. . Then, as long as the L electrode 30 is maintained in the ON state, the air venting operation is continued for a predetermined time, and then the air venting operation control is terminated (NO in step S2, and terminated after repeating step S1 for the predetermined time).

  However, if the L electrode 30 changes from ON to OFF after the start of the air venting operation control (YES in step S2), the change of the L electrode 30 based on the timing of the timer (the water level from above the set low water level to below) It is checked whether or not (change) is within a set time (for example, 10 minutes) for air intrusion determination at the initial stage of operation from the start of the air vent operation control (step S3). This set time range for air intrusion determination is the time lapse range in the initial stage of operation for detecting the fluctuation in water level in which the set time interval for the air vent operation control is changed.

  When the change of the L electrode 30 occurs within the time lapse range of the set time (NO in step S3), the counter L is counted once (step S8), and the counter L is counted twice. If it is above, it will be judged that the water has fallen due to air intrusion (decrease in the water level) and make a reservation for the falling water treatment (YES in step S9, step S10). The operation proceeds to the opening operation of the valve 27. The above-described water falling process outputs a determination result that air intrusion has occurred to the time interval change processing unit 65, and the time interval change processing unit 65 currently sets the set time interval of the air vent operation control unit 64. If there is no setting change up to the previous time, the standard time value or the time value changed and set during the previous air vent operation control is changed to a shorter time value. As a result of this processing, the air bleeding operation control unit 64 starts to execute the next air bleeding operation control at a cycle shorter than the previous time based on the set time interval after the change setting. In addition, when the counter L is less than twice, that is, once, the air venting operation is continued after the water is replenished by the water replenishment control after step S5, and still the set time range for the air intrusion determination described above. If the L electrode 30 changes from ON to OFF and the counter L reaches twice, the above-described water falling treatment is performed. In other words, the first time is allowed, but if it occurs twice, it is determined that air intrusion has surely occurred and the falling water treatment is performed.

  If the set time range for air intrusion determination has already passed in step S3 (YES in step S3), it is confirmed whether or not a set time for water leakage determination (for example, 64 hours) has passed since the last water replenishment (for example, 64 hours). Step S4). If it has already passed, it will transfer to the water supplement control of step S5 immediately (it is YES at step S4). If the counter N has not yet elapsed, the counter N is counted once (NO in step S4, step S11). If the counter N is counted twice or more, it is determined that the water level is lowered due to a small amount of leakage. On the other hand, the small leakage process is performed (YES in step S12, step S13), and if the counter N is less than twice, the process proceeds to the opening operation of the water supplement electromagnetic valve 27 in step S5 (NO in step S12). In the small amount leakage process described above, the air venting operation is terminated and the user is notified that a small amount of leakage has occurred. This notification may be displayed on the remote control 40, 50, etc., with a text saying “A small amount of leak has occurred. Please contact a service person”, an error code number indicating this, or Together with these, a warning light is turned on or blinked. When the count of the counter N is less than 2, that is, once, the air venting operation is resumed after the water is replenished by the water replenishment control in steps S5 to S7, and still the above set time range for air intrusion determination ( 10 minutes) or more, but before the set time (64 hours) for determining water leakage elapses, if the L electrode 30 changes from ON to OFF again and the counter N becomes twice, Perform a small amount of leakage treatment. That is, the lowering of the water level from ON to OFF of the L electrode 30 occurring within the set time range for air intrusion determination does not count, the set time for air intrusion determination elapses and the set time for water leak determination is reached. If the generated water level drop from the ON to OFF of the L electrode 30 occurs twice, it is determined that a small amount of leakage has occurred.

  In step S5, the water replenishing electromagnetic valve 27 is opened, water is replenished into the hot water tank 21 from the water replenishing passage 28, and the water replenishing electromagnetic valve 27 is closed when the H electrode 29 changes from OFF to ON (in step S6). YES, step S9). These steps S5 to S7 are the contents of the water replenishment control. At this time, in spite of starting the water replenishment by opening the water replenishing electromagnetic valve 27 in step S5, the set time set as a time value that would normally be able to fill the water to the set high water level ( For example, if the H electrode 29 still does not change to ON even after continuing for 2 minutes, it is determined that a large amount of leakage has occurred, and the water replenishing solenoid valve is closed (NO in step S6, step S14). ), A large leakage process is performed (step S15). That is, the user is notified through the remote controllers 40 and 50 in the same manner as the above-described small leak processing, while the processing for shutting down the operation of the circulation pump 23 and the closing operation of the thermal valve is immediately performed.

  On the other hand, in order to continue the air venting operation in step S1 without causing a drop in the water level in step S2 (NO in step S2), although not shown in the figure, the time interval change processing unit 65 notifies the fact. Based on this information, the time interval change processing unit 65 sets the set time interval of the air vent operation control unit 64 longer than the currently set time value (standard set time value or time value set last time). The time value is changed and set. As a result of this processing, the air vent operation control unit 64 starts executing the next air vent operation control at a cycle longer than the previous time based on the set time interval after the change setting. Furthermore, although there is a slight drop in the water level (YES in step S2), the air venting operation is continued without reaching the above water drop process (step S10), the small amount leak process (step S13), or the large amount leak process (step S15). In this case, the setting process of the set time interval is not performed by the time interval change processing unit 65, and the air vent operation control unit 64 executes the next air vent operation control based on the currently set time interval. To do.

  According to the above control, when it is detected by the change of the L electrode 30 from ON to OFF that the water level of the hot water tank 21 has fallen below the set low water level due to the start of the air vent operation control, that is, the start of the hot water circulation. In addition, since it is distinguished whether it is for air intrusion determination or for water leak determination depending on when the phenomenon of the water level drop detection occurs, it becomes possible to distinguish between the occurrence of air intrusion and the occurrence of water leak. . That is, if it is within the set time lapse range for air intrusion determination in the initial stage of operation from the start of the air vent operation control, it is counted by the counter L for air intrusion determination, while after the set time has passed, Since the counter N for determining a small amount of leakage is counted within the time, that is, the above-described drop in the water level occurring within the set time lapse range for determining air intrusion is not counted for determining the water leakage. Therefore, it is possible to reliably distinguish and determine whether the occurrence of the above phenomenon is caused by air intrusion or water leakage. As a result, it is possible to reliably determine the occurrence of air intrusion, while reliably avoiding erroneous determination of occurrence of water leakage based on a drop in the water level caused by the occurrence of air intrusion.

  In addition, if a predetermined water level drop occurs within the set time lapse range for air intrusion determination, it is determined that air intrusion has occurred and the set time interval at which the air vent operation control is executed is shortened, and the next air vent is performed. While the operation control is started at a shortened time interval, if the water level does not decrease, the set time is changed to be longer. For example, the heating terminal 4 installed on the floor is higher than the standard setting. Optimum according to the actual installation situation of the heating terminals 4 and 5 such that the heating terminal 5 installed on the same floor as the heat source device 2 at a short time interval or at a longer time interval than the standard setting. The air bleeding operation control can be executed at a simple time interval.

Second Embodiment
FIG. 4 shows a hot water heating system according to a second embodiment of the present invention. This hot water heating system has four heating terminals 4a, 4b, 4c, and 4d on the second floor, and heating terminals 5a, 5b, 5c, 5d, 5e, and 5f on the first floor with respect to the heat source unit 2a. No. 6 and 10 units are connected. Of these, the heating terminals 4a, 4b and 4c are floor heating terminals for each room on the second floor, the heating terminal 4d is a bathroom dryer in the second floor bathroom, and the heating terminals 5a, 5b and 5c are floor heating terminals for each room on the first floor. The heating terminals 5d and 5e are each composed of a fan convector on the first floor, and the heating terminal 5f is composed of a bathroom dryer on the first floor bathroom. Among these heating terminals, low-temperature water is circulated and supplied to floor heating terminals, and high-temperature water is circulated and supplied to bathroom dryers and fan convectors. Further, in the same figure, the outgoing pipe and the return pipe are shown by a single line for the purpose of illustration, but in the figure, reference numerals 41a, 41b, 41c, 41d, 51a, 51b, 51c, 51d, 51e, Reference numeral 51f denotes a forward pipe, and reference numerals 42a, 42b, 42c, 42d, 52a, 52b, 52c, 52d, 52e, and 52f denote forward pipes. In the figure, reference numeral 31a denotes a low-temperature forward connection head, 32a denotes a low-temperature return-side connection head, reference numeral 31b denotes a high-temperature forward-side connection head, and 32b denotes a high-temperature return-side connection head. Shows the head. Further, reference numerals 43a, 43b, 43c, 43d, 53a, 53b, 53c, 53d, 53e, 53f are terminals attached to the heating terminals 4a, 4b, 4c, 4d, 5a, 5b, 5c, 5d, 5e, 5f. The side controller is shown.

  As shown in FIG. 5, the heat source unit 2 a is obtained by adding a low temperature outgoing path 33 to the heat source unit 2 (see FIG. 1) of the first embodiment, and the low temperature water from the hot water tank 21 is sent to the outgoing path 33. The high-temperature water from the heat exchanger 25 is supplied to the high-temperature forward connection head 31b through the forward path 26, and the low-temperature and high-temperature return-side connection heads are supplied to the low-temperature forward connection head 31a. The hot water after the heat radiation returned to 32 a and 32 b is returned to the hot water tank 21 through the return path 20. In addition, the same code | symbol as 1st Embodiment is attached | subjected to the same component as the heat source machine 2 of 1st Embodiment, and the detailed description is abbreviate | omitted.

The controller 6 of the second embodiment has the same configuration as that of the first embodiment, and has the same number (10) of connection terminals as the heating terminals 4a to 4d and 5a to 5f as shown in FIG. 601 to 610 are provided. Among these connection terminals 601 to 610, six connection terminals 601 to 606 are set for low temperatures corresponding to six low temperature heating terminals 4 a to 4 c and 5 a to 5 c, and the remaining four connections The terminals 607 to 610 are set for high temperatures corresponding to the four high temperature heating terminals 4d and 5d to 5f. The connection terminals 601 to 610 is the heating operation control portion 61 of the controller 6 (see FIG. 2), the abnormality determination processing section 63, Ri Contact is connected to the air vent operation control unit 64 and the time interval changing unit 65, the connecting terminals 601 By connecting the terminal-side controllers 43a to 43d and 53a to 53f to ~ 610, bidirectional communication is possible between them, and the control or processing by the controller 6 is performed for each heating terminal. It has become.

  In addition, each of the connection terminals 601 to 610 is assigned a preset time value as a set time interval at which the air vent operation control by the air vent operation control unit 64 is executed. That is, infinity (that is, control information for not executing the air vent operation control) is assigned to the first to third connection terminals 601 to 603 for low temperature, and air is supplied to these first to third connection terminals 601 to 603. Terminal side controllers 53a, 53b, and 53c of heating terminals 5a to 5c, which are floor heating terminals on the first floor that are considered to be intrusive, are connected. And the time interval (for example, 1440 hours) of the maximum time value is allocated to the 4th connection terminal 604 for low temperature, The heating terminal 4a which is a floor heating terminal of the 2nd floor small area with respect to this 4th connection terminal 604 A terminal-side controller 43a is connected, and a time interval (for example, 720 hours) of a standard time value is allocated to the fifth connection terminal 605 for low temperature, and a floor heating terminal having a standard area on the second floor is assigned to the fifth connection terminal 605. Is connected to the terminal-side controller 43b of the heating terminal 4b, and the low-temperature sixth connection terminal 606 is assigned a time interval of a minimum time value (for example, 360 hours). The terminal side controller 43c of the heating terminal 4c which is a large area floor heating terminal is connected.

  Further, the seventh and eighth connection terminals 607 and 608 for high temperature are assigned infinity (that is, control information for not executing the air venting operation control) in the same manner as described above, and the seventh and eighth connection terminals 607 and 607, 608 is connected to the terminal-side controllers 53d and 53e of the heating terminals 5d and 5e, which are fan convectors on the first floor that are considered to be incapable of air intrusion, and the ninth connection terminal 609 has a time interval of the maximum time value ( For example, 1440 hours) is allocated, and the terminal-side remote control 53f of the heating terminal 5f, which is a bathroom dryer of the first floor bathroom, is connected to the ninth connection terminal 609, and the time interval of the standard time value is connected to the tenth connection terminal 610 (For example, 720 hours) is allocated, and the terminal-side remote control 43d of the heating terminal 4d, which is a bathroom dryer of the second-floor bathroom, is connected to the tenth connection terminal 610.

  Each of the connection terminals 601 to 610 described above constitutes a time interval changing unit. And the connection between such connection terminals 601 to 610 and the terminal-side controllers 43a to 43d, 53a to 53f is performed according to the type and installation location of the heating terminal during the installation work, Different time values (including infinity) for each heating terminal are initially set (standard setting) in the installation work stage as the set time interval at which the air vent operation control is executed. In other words, it is appropriate when switching the air vent operation control or executing the air vent operation control according to the situation of the installation site (type of heating terminal, situation of the installation location) in the installation construction stage. It is possible to perform switching setting (change setting) of a set time interval. Since such switching or change setting is realized for the first time by selecting and connecting the corresponding connection terminal, it can be said that the above switching or change setting command is given to the controller 6 from the heating terminal side. .

<Other embodiments>
The present invention is not limited to the first and second embodiments described above, but includes other various embodiments. That is, the remote controllers (terminal-side remote controllers) 40 and 50 attached to the heating terminals 4 and 5 are used as operation means (time interval changing means) that can change and set the set time interval of the air vent operation control unit 64 of the controller 6. May be. In this case, a switch means for setting a time interval change is provided for the remote controllers 40 and 50 so that a time interval change command (operation signal) can be sent to the controller 6 by operating the switch. That's fine. That is, the set time interval may be changed and set by human operation. Such an artificial change setting by the operation means may be added together with the time interval change processing unit 65 of the above embodiment or instead of the time interval change processing unit 65. When added together with the time interval change processing unit 65, if there is a change setting by the operation signal, it is given priority, and thereafter, the change setting based on the control by the time interval change processing unit 65 may be applied.

  The controller 6 is provided with the same number of dip switches (time interval changing means) for setting the set time interval and for changing the set time intervals as the number of heating terminals that can be connected to the heat source unit 2, and each dip switch is connected to each heating terminal. Correspondingly, the setting time interval for each heating terminal may be artificially changed and set by switching operation of the dip switch.

  In contrast to the hardware time interval changing means (one or more combinations of the connection terminal, the operating means, or the dip switch of the second embodiment) that enables the artificial change setting described above, You may make it comprise a hot water heating system combining the time interval change process part 65 which enables a change setting by automatic control.

  In the above embodiment, the combination of the H electrode 29 and the L electrode 30 is used as the water level detection means. However, for example, a float-attached water level sensor that moves along with the fluctuation of the water level and continuously detects the water level is used as the water level detection means. You may do it.

  Although the case where the heat source unit 2 is installed in the first floor portion is shown in the above embodiment, the present invention is not limited thereto, and the heat source unit is installed in a hot water heating system in which the heat source unit is installed lower than one heating terminal in the vertical direction. The present invention can be applied.

  Moreover, in the said embodiment, the water level fall from the state which detected the water level more than a setting high water level before the air venting operation start (H electrode is ON state) to less than a setting low water level by the air venting operation start (the water level more than a set water level difference or more) Is detected (when the L electrode changes from ON to OFF), it is determined that air intrusion has occurred, and the setting time interval is changed and set. It is possible to determine that air intrusion will surely occur. Not limited to this, regardless of the water level before the start of the air venting operation, the water level lowering from the set low water level to the lower side When the detection (L electrode changes from ON to OFF), or when the detection of a drop in the water level from above the set high water level (H electrode changes from ON to OFF), the counter L for air intrusion determination In Scan 1 or, alternatively, it is determined that the air entry occurs may be performed to change setting of the set time interval. In the flowchart of FIG. 3, the setting time interval may be changed and set once by the air intrusion determination counter L.

  Furthermore, in the above-described embodiment, water such as tap water supplemented by the supplementary water channel 28 is used as hot water. However, the present invention is not limited to this, and a liquid heat medium other than tap water is also included in the “hot water”.

It is a mimetic diagram of a warm water heating system to which a 1st embodiment of the present invention is applied. It is a block diagram which shows the content of a controller. It is a flowchart which shows the control content by a controller. It is a schematic diagram of the hot water heating system of 2nd Embodiment. It is a schematic diagram which shows the heat source machine of FIG. FIG. 5 is a block diagram showing a connection relationship between the controller of FIG. 4 and a terminal-side controller.

Explanation of symbols

2,2a Heat source device 4,5 Heating terminal 4a-4d Heating terminal 5a-5f Heating terminal 6 Controller 20 Return path (circulation circuit)
21 Hot water tank 22 Extraction path (circulation circuit)
26, 33 Outbound (circulation circuit)
29 H electrode (water level detection means)
30 L electrode (water level detection means)
40, 50 Terminal side remote control (operating means, time interval changing means)
41, 51 Outward piping (circulation circuit)
41a to 41d, 51a to 51f Outward piping (circulation circuit)
42,52 Return piping (circulation circuit)
42a to 42d, 52a to 52f Return piping (circulation circuit)
64 Air venting operation control unit (Air venting operation control means)
65 Time interval change processing unit (time interval change means)
601-610 connection terminals (time interval changing means)

Claims (5)

A heat source device having a hot water tank for storing circulating hot water and at least one heating terminal are connected by a circulation circuit, and hot water heated from the heat source device is circulated to the heating terminal through the circulation circuit by operation of a circulation pump. Targeting a hot water heating system configured to supply and perform a heating operation, by operating the circulation pump at a set time interval in a heating operation stop state to circulate unheated hot water in the circulation circuit An air bleed operation control method for a hot water heating system that performs air bleed operation control for discharging air in a circulation circuit from the hot water tank,
The hot water tank is provided with water level detecting means for detecting the water level in the hot water tank, and when the air venting operation control is started, the water level lowering fluctuation in the hot water tank is monitored based on the water level detection information from the water level detecting means. , If there is a water level decrease fluctuation in the time lapse range from the start of the air vent operation control to the initial stage of operation, the set time interval for executing the next air vent operation control is shorter, and if there is no water level decrease fluctuation, the next time An air venting operation control method for a hot water heating system, characterized in that the set time interval for executing the air venting operation control is changed and set longer. An air venting operation control method for a hot water heating system according to claim 1,
An air venting operation control method for a hot water heating system, wherein when the water level lowering fluctuation occurs in the time lapse range, the set time interval is changed and set shorter as the water level lowering fluctuation is larger. A heat source device having a hot water tank for storing circulating hot water and at least one heating terminal are connected by a circulation circuit, and hot water heated from the heat source device is circulated to the heating terminal through the circulation circuit by operation of a circulation pump. Targeting a hot water heating system configured to supply and perform a heating operation, by operating the circulation pump at a set time interval in a heating operation stop state to circulate unheated hot water in the circulation circuit An air bleed operation control method for a hot water heating system that performs air bleed operation control for discharging air in a circulation circuit from the hot water tank,
The hot water tank is provided with a water level detecting means for detecting the water level in the hot water tank, and when the air vent operation control is started, the water level fluctuation in the hot water tank is monitored based on the water level detection information from the water level detecting means, When the water level drop more than the set water level difference is detected in the time lapse range from the start of the air vent operation control to the initial operation stage, the set time interval for executing the next air vent operation control is changed and set shorter. An air venting operation control method for a hot water heating system. A heat source device having a hot water tank for storing circulating hot water and two or more heating terminals are connected by a separate circulation circuit, and the hot water heated from the heat source device through the circulation circuit by operation of the circulation pump is supplied to the heating terminal. Targeting a hot water heating system configured to perform circulation operation by circulating supply, by operating the circulation pump at set time intervals in a heating operation stop state and circulating unheated hot water to the circulation circuit An air bleed operation control method of a hot water heating system that performs air bleed operation control for discharging air in the circulation circuit from the hot water tank,
The air venting operation control is executed individually for each of the two or more heating terminals,
The hot water tank is provided with a water level detecting means for detecting the water level in the hot water tank, and when the air bleeding operation control is started for each heating terminal, the warm water in the time lapse range from the start of the air bleeding operation control to the initial stage of operation. Collect water level drop information on water level drop in the tank based on the water level detection information from the water level detection means,
Based on the water level lowering information collected for each individual heating terminal, the above set time interval for executing the next air vent operation control is individually changed for each heating terminal,
An air venting operation control method for a hot water heating system, wherein the air venting operation control is executed for each heating terminal at every set time interval after the change setting. A heat source device having a hot water tank for storing circulating hot water and at least one heating terminal are connected by a circulation circuit, and hot water heated from the heat source device is circulated to the heating terminal through the circulation circuit by operation of a circulation pump. The heating circuit is configured to perform heating operation, and when the heating operation is stopped, the circulation pump is operated at set time intervals to circulate unheated hot water through the circulation circuit, thereby allowing air in the circulation circuit to be circulated. A hot water heating system provided with an air vent operation control means for performing air vent operation control for discharging the hot water from the hot water tank,
A time interval changing means for setting the set time interval for executing the air vent operation control to be changeable,
The heat source machine includes a controller configured to include the air vent operation control means,
The time interval changing means is configured by operating means attached to the heating terminal,
It said operating means, it is connected with the transmittable to the controller operation signal for setting to be changed set time interval vent operation control by the air venting operation control means,
Warm water heating system, characterized in that.

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