JP3941544B2 - Freezing prevention control method of heat source machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a freeze prevention control method used for preventing freezing of equipment in a cold district or winter in a heat source machine such as a water heater.
[0002]
[Prior art]
  Conventionally, a freeze prevention control method for a water heater is known as a freeze prevention control method for this type of heat source device. In hot water heaters, water enters the pipeline from the incoming water line connected to the water pipe to the hot water tap (hot water supply curan) connected via the heat exchanger, hot water outlet line, and the external hot water supply line. It is filled with water. For this reason, there is a possibility that the internal water freezes in the winter or at night when the temperature is low, when it is not used and not heated. Therefore, in order to prevent such freezing, a freeze prevention control in which a heater for freezing prevention is provided and the heater is heated under a predetermined condition is performed by the controller.
[0003]
  As an example of the freeze prevention control in such a water heater, when the temperature detection value such as the outside air temperature falls below a predetermined temperature, the heater is heated (for example, intermittent heating operation) to heat the internal water. Thus, freezing is prevented. This anti-freezing control is automatically started when the hot water heater is turned on due to the nature of the control purpose, and heater heating is executed when a predetermined condition is established by monitoring the outside air temperature or the like. ing.
[0004]
[Problems to be solved by the invention]
  However, in the above-described method for preventing freezing of a hot water heater, only the normal state in which water is filled in the water inlet, heat exchanger, and hot water outlets disposed in the water heater, that is, Regardless of the presence or absence of water in the heat exchanger, the heater is heated based on the temperature detection value uniformly, so that the following inconvenience may occur.
[0005]
  That is, the fin tube which is the main body of the heat exchanger is built in the heat exchange can body, and the introduction pipe portion for introducing water from the water inlet pipe to the fin tube is the outer surface of the body plate of the heat exchange can body. And is subjected to heat exchange heating by receiving combustion heat in the heat exchange can body. Therefore, the antifreezing heater for heating the heat exchanger is provided so as to heat the entire heat exchanger by heating the outer surface of the body plate of the heat exchange can body. On the other hand, in the above heat exchange can body, in order to prevent the combustion flame from leaking out of the heat exchange can body and burning the inside of the water heater in the unlikely event that the shell plate is cracked, it is blown by receiving a high temperature. Thus, a thermal fuse for detecting leakage of the combustion flame is disposed along the outer surface of the body plate of the heat exchange can body. In a normal case, the temperature fuse and the heater are arranged apart from each other so that the temperature fuse is not blown by the heating operation of the heater.
[0006]
  However, due to the recent demand for downsizing of water heaters, the heat exchange can body itself has also been significantly downsized (for example, down to a fraction of the previous size), greatly increasing the distance between the thermal fuse and the heater. A layout that must be narrowed is being adopted. Even if the interval is narrowed in this way, if the heat exchanger is always filled with water that may freeze, even if the heater is heated, there is no adverse effect on the temperature fuse, but the above water should be present. If not, if the heater is heated, the thermal fuse may be blown by the heat. Here, once the thermal fuse is blown, the entire heat exchange can body must be removed from the inside of the water heater housing in order to replace it, which requires a very large amount of work and labor.
[0007]
  By the way, in the state where the water heater is used, it is normal that the heat exchanger is always filled with water and there is no situation where water does not exist. However, there may be a situation in which there is no water in the heat exchanger due to a mistake in installation work, a user's mistake after starting use, or the like. That is, in the installation work, after the water heater is installed, the pipe is filled with water to perform a test operation, and after the test operation is completed, the water is drained and the power outlet is disconnected to complete the installation work. At this time, if the power outlet is forgotten to be unplugged, the freeze prevention control is executed in a state where there is no water in the heat exchanger. In addition, the user forgot to unplug the power outlet even though the user had drained the water heater that had been in use for a long period of time, or the power outlet had been unplugged but was not filled with water when reused. It is also possible to plug in an outlet. In these cases as well, the freeze prevention control is executed in a state where there is no water in the heat exchanger as described above.
[0008]
  On the other hand, even if water is drained from the water heater, water droplets are not completely drained and water droplets remain attached to the inner wall surface or the like, and the water droplets may collect and partially accumulate. If the accumulated water after draining such drainage freezes, even if it is reflowed until it is thawed / dissolved, it will become resistance to water flow and the water heater will not be reusable. Conceivable.
[0009]
  The present invention has been made in view of such circumstances, and an object of the present invention is to perform temperature control by performing anti-freezing control according to the detection result of the presence or absence of water in the heat exchanger.HiAn object of the present invention is to provide a freeze prevention control method for a heat source machine that avoids the possibility of melting of the fuse and also avoids the occurrence of a situation where the reuse becomes impossible due to partial freezing after draining and draining.
[0010]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention is based on prohibiting heater heating to the heat exchanger if there is no water after detecting the presence or absence of water in the heat exchanger, Regardless of the presence or absence of water, all parts of the heater are heated to the normal anti-freezing control until there is no water and the water is likely to be accumulated except for the heat exchanger. Is selectively added to the control of anti-freezing control as usual.
[0011]
  Specifically, a heat exchanger that is heat-exchanged and heated by a heat source, an introduction pipe that introduces water to be heated into the heat exchanger, a lead-out pipe that is led out from the heat exchanger, and freeze prevention or thawing In order to prevent this, the heat source apparatus includes a heater that directly or indirectly heats the heat exchanger, and a temperature detection unit that determines whether or not to perform anti-freezing control by heating operation of the heater. For the control method, the invention according to claim 1 employs the following specific items. That is, water detection means for detecting the presence or absence of water is provided at least in the heat exchanger, and when the water detection means detects that there is water, anti-freezing control according to the temperature detected by the temperature detection means is executed.ShiWhen the water detecting means detects that there is no water, the heating operation of the heater is prohibited regardless of the temperature detected by the temperature detecting means.On the other hand, when power is turned on to the heat source unit, anti-freezing control according to the detected temperature is performed regardless of the detection result by the water detection means until the predetermined time has elapsed since the power was turned on. To run.
[0012]
  In the invention according to claim 2,A heat exchanger that is heat-exchanged and heated by a heat source, an introduction pipe that introduces water to be heated into the heat exchanger, a lead-out pipe that is led out from the heat exchanger, and the heat exchange that is used for freeze prevention or thawing A heater for directly or indirectly heating the heater and a heater for heating other parts other than the heat exchanger, and a temperature detecting means for determining whether or not to perform anti-freezing control by these heaters The following specific items are adopted for the freeze prevention control method of the heat source equipment provided. That is,At least water detection means for detecting the presence or absence of water in the heat exchanger is provided, and when it is detected that there is water by the water detection means, freezing prevention control according to how the temperature detected by the temperature detection means is executed, When the water detecting means detects that there is no water, the heating operation of the heater for heating the heat exchanger is prohibited regardless of the temperature detected by the temperature detecting means, while the other part is heated. The heating operation of the heater is permitted.
[0013]
  In addition, as said "temperature detection means", it is the judgment temperature which detects outside air temperature or the atmospheric temperature in a heat source machine, and these determined that the water inside heat exchangers etc. may freeze It may be determined that it is necessary to execute anti-freezing control if it becomes below. In addition, as the above “freezing prevention control according to the detected temperature”, if the detected temperature is lower than the determination temperature, the heater is kept ON (heating operation) as long as the low temperature continues or set. Repeat either ON (heating) or OFF (heating stop) every time (intermittent operation), or change the degree of heating by changing the time to continue the ON operation according to the degree of low temperature You can do it. Furthermore, the “heater that directly or indirectly heats the heat exchanger” means the fin tube itself that constitutes the heat exchanger, or an introduction pipe section or a bent pipe that is a part of the heat exchanger connected to the fin tube. It is installed to heat the internal fin tube indirectly by heat conduction by heating the heater installed to heat the part directly or the body plate of the heat exchange can body constituting the heat exchanger It is a heater.
[0014]
  Claims above1According to the above, if there is no water in the heat exchanger, the heating operation of the heater for heating the heat exchanger is prohibited even if the detected temperature is low. The occurrence of fusing due to the heater heating can be avoided. This makes it possible to place the heater for heating the heat exchanger and the thermal fuse close to each other, and the heat exchanger can without melting the thermal fuse whatever the water in the heat exchanger is. The body can be downsized and the entire heat source machine can be downsized. On the other hand, if there is water in the heat exchanger, freeze prevention control based on the detected temperature is executed as usual, and this prevents the heater from being heated when the detected temperature is lower than the judgment temperature, thereby preventing freezing. Heating is doneAbsent. In addition, when the power is turned on, as an exception to the freeze prevention control method of claim 1, the freeze prevention control is executed as usual regardless of whether or not there is water in the heat exchanger until a predetermined time elapses. By doing so, even if drainage drainage was performed last time, water remains on the inner wall surface of the introduction pipe line, heat exchanger or lead-out pipe line, or a part of valves and connection fittings attached to these. Even if this residual water is frozen at a low temperature, it is thawed by the execution of the antifreezing control. As a result, it is possible to avoid the occurrence of a situation where water cannot be recirculated due to freezing of the remaining water even after draining and draining. Therefore, the above “predetermined time” is a time during which the water that may remain may be thawed, and a time that does not adversely affect the fusing even if the thermal fuse is disposed in the vicinity. Is set.
[0015]
  ContractAccording to Claim 2,If there is no water in the heat exchanger, the heating operation of the heater for heating the heat exchanger is prohibited even if the detected temperature is low, so even if a thermal fuse is installed in the vicinity of this heater, it is caused by the heater heating Occurrence of fusing can be avoided. This makes it possible to place the heater for heating the heat exchanger and the thermal fuse close to each other, and the heat exchanger can without melting the thermal fuse whatever the water in the heat exchanger is. The body can be downsized and the entire heat source machine can be downsized. On the other hand, if there is water in the heat exchanger, freeze prevention control based on the detected temperature is executed as usual, and this prevents the heater from being heated when the detected temperature is lower than the judgment temperature, thereby preventing freezing. There is no heating. in addition,Even if it is detected that there is no water in the heat exchanger, freezing prevention control based on the detected temperature is applied to parts other than the heat exchanger, for example, inlet pipes or outlet pipes, or parts such as valves and fittings attached thereto. Therefore, it is possible to prevent freezing of partially accumulated water or water droplets adhering to the inner wall surface.
[0016]
  Where aboveClaimIn step 2, when power is turned on to the heat source machine, anti-freezing control according to the detected temperature is executed regardless of the detection result by the water detection means until a predetermined time elapses after the power is turned on. (Claim 3). In other words, when power is turned onClaimAs an exception to the anti-freezing control method 2, the anti-freezing control is executed as usual only when a predetermined time elapses, whether or not there is water in the heat exchanger. By doing so, even if drainage drainage was performed last time, water remains on the inner wall surface of the introduction pipe line, heat exchanger or lead-out pipe line, or a part of valves and connection fittings associated therewith. Furthermore, even if this residual water is frozen at a low temperature, it is thawed by the execution of the antifreezing control. As a result, it is possible to avoid the occurrence of a situation where water cannot be recirculated due to freezing of the remaining water even after draining and draining. Therefore, the above “predetermined time” is a time during which the water that may remain may be thawed, and a time that does not adversely affect the fusing even if the thermal fuse is disposed in the vicinity. Is set.
[0017]
  Furthermore, the water detection means used in any one of claims 1 to 3 is configured by a self-heating type thermistor, and the presence or absence of water is detected according to the degree of heat generation when the thermistor is energized. (Claim 4). By doing in this way, it becomes possible to detect the presence or absence of water easily and reliably, and the action according to any one of claims 1 to 3 can also be obtained with certainty.
[0018]
【The invention's effect】
  As described above, claim 1OrAccording to the anti-freezing control method for a heat source apparatus according to any one of claims 4 to 7, even if a thermal fuse is disposed in the vicinity of the heat exchanger heating heater, occurrence of fusing due to heater heating can be avoided. . Thus, the heater for heating the heat exchanger and the thermal fuse can be arranged close to each other, and the heat exchanger can body can be melted without causing the thermal fuse to melt under any circumstances. Realization of downsizing and overall downsizing of heat source equipmentit can. In addition, when the power is turned on, the drainage drainage is performed by performing anti-freezing control as usual regardless of whether or not there is water in the heat exchanger until the predetermined time has elapsed. Even so, it is possible to reliably avoid the occurrence of a situation in which re-water passage is impossible due to freezing of the remaining water.
[0019]
  ContractClaimA freeze prevention control method for a heat source machine according to any one of claims 2 to 4.According toThe heat exchanger heating heater and the thermal fuse can be arranged close to each other, and the heat exchange can body can be reduced in size and without causing the thermal fuse to blow out under any circumstances. Miniaturization of the entire heat source device can be realized. in addition,Even if the heater for heating the heat exchanger is arranged close to the temperature fuse, it is possible to prevent freezing of partial residual water or the like in a portion other than the heat exchanger while reliably avoiding the possibility of fusing.
[0020]
  In particular,According to Claim 3, when the power is turned on, the antifreezing control is executed as usual regardless of whether or not there is water in the heat exchanger until a predetermined time elapses. Therefore, it is possible to reliably avoid the occurrence of a situation where water cannot be recirculated due to freezing of the remaining water even after draining and draining.
[0021]
  According to claim 4, the presence or absence of water in any one of claims 1 to 3 can be easily and reliably detected, and the effect of any one of claims 1 to 3 can be achieved. You will be able to get it reliably.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0023]
  FIG. 1 shows an example of a heat source machine to which a freeze prevention control method according to an embodiment of the present invention is applied. This heat source machine has a hot water supply function. In the figure, 1 is a housing of the heat source machine, 2 is a heat exchange can body, 3 is a combustion can body, and the heat exchange can body 2 mainly includes a fin tube 41. The heat exchanger 4 is built in, and the combustion can body 3 contains a combustion burner 5 as a heat source. The heat exchange can body 2 and the combustion can body 3 communicate with each other to form a combustion chamber. A blower fan 6 is attached to the lower side of the combustion can body 3, and an upper side of the heat exchange can body 2. An exhaust cylinder 7 is attached. The combustion burner 5 is supplied with fuel gas from a fuel gas supply system (not shown) and receives combustion air from the blower fan 6 to perform combustion operation, so that the heat in the heat exchanger 4 is caused by the combustion heat. Heat exchange heat is applied, and the combustion exhaust gas is discharged from the exhaust tube 7 to the outside of the housing 1.
[0024]
  The heat exchanger 4 is disposed along the fin tube 41 and the body plate 21 constituting the heat exchange can body 2, and introduces a pipe portion 42 that guides water from the downstream end of the water inlet pipe 8 to the fin tube 41. And the bent pipe portion 43, and the heat exchange can body 2 also constitutes a part of the heat exchanger 4.
[0025]
  The heat exchanger 4 is connected to a water pipe or the like by a water inlet fitting 81 and heated in the heat exchanger 4 and a water inlet pipe 8 serving as an introduction pipe for supplying tap water to the heat exchanger 4. A hot water discharge pipe 9 serving as a discharge pipe for discharging hot water is connected in communication with each other. The hot water supply line 9 is connected to a hot water supply pipe (not shown) by a hot water supply fitting 91, and hot water is supplied to hot water taps at various places in the home such as a kitchen and a washroom through the hot water supply pipe. Further, a bypass conduit 10 is connected between the water inlet conduit 8 and the hot water outlet conduit 9, and a bypass flow rate adjustment for adjusting the bypass flow rate of tap water from the water inlet conduit 8 in the middle of the bypass conduit 10. A valve 101 is interposed.
[0026]
  Drain plugs 82 and 92 are integrally attached to the water inlet fitting 81 and the hot water outlet fitting 91, respectively, and the water inlet pipe 8, the heat exchanger 4, the hot water outlet pipe 9 and Drainage drainage from the bypass line 10 is performed. In addition, for example, an impeller-type incoming flow rate sensor 83 that detects the incoming water flow rate and an incoming water temperature sensor 84 that detects the incoming water temperature are interposed in the incoming water conduit 8. A hot water temperature sensor 93 for detecting the hot water temperature immediately after coming out of the vessel 4 and a hot water temperature sensor 94 for detecting the hot water temperature supplied to the outside of the housing 1 are provided.
[0027]
  Each of the temperature sensors 84, 93, 94 is composed of, for example, a thermistor and the like, considering that it can be used in other functions such as at least one of them, in particular, a hot water supply and warming function. The incoming water temperature sensor 84 is constituted by a self-heating type thermistor. That is, the water temperature sensor 84 using the self-heating type thermistor detects the temperature of the water by detecting the normal temperature detection means for detecting the water temperature and the presence or absence of water in the pipeline. The water detection means for detecting the presence or absence of water in the exchanger 4 is also used. That is, as the water flow path, the heat exchanger 4 is positioned at the uppermost position, and the other pipes 8, 9, 10 are positioned lower than the heat exchanger 4. By detecting the absence of water at the position, it can be detected that at least no water is present in the heat exchanger 4. If the hot water temperature sensor 93 is constituted by a self-heating type thermistor and is used as water detection means, the presence or absence of water in the heat exchanger 4 can be directly detected.
[0028]
  Here, the principle of the presence / absence detection of water by the self-heating type thermistor will be briefly described. This self-heating type thermistor is composed of an element having a negative characteristic as a resistor, and has a characteristic that its resistance value decreases as the temperature rises due to self-heating when energized. For this reason, if the water in the water inlet 8 is filled with water and is in an underwater environment, even if self-heating occurs, the water is cooled by the water and the temperature rise is lowered, so that the highest resistance as shown by the solid line in FIG. Changes in the region of values (values obtained by taking resistance values as voltage values). On the other hand, in a dry aerial environment where there is no water in the inlet pipe 8, the temperature rises to a high level due to self-heating, and changes in the region of the lowest resistance value as shown by the broken line in FIG. If it is not in an air environment or an underwater environment, but in an environment where water droplets are attached, the resistance value region changes between the two. In addition to the presence or absence of water, it is possible to detect whether there is water droplets and there is a possibility of residual water.
[0029]
  A freezing prevention heater 11 for heating the heat exchanger 4 to prevent freezing is installed on the body plate 21 of the heat exchange can body 2, and includes a water inlet fitting 81, a hot water outlet fitting 91, an incoming water flow rate sensor 83, and a hot water outlet pipe line. 9 and freezing prevention heaters 12 are also installed in each part including the bypass conduit 10 and the like. These heaters 11 and 12 are constituted by rod-like resistance heating elements (for example, ceramic heaters) that generate heat when energized. In the housing 1, an ambient temperature sensor 13 is disposed as a temperature detecting means that is held by the housing 1 and detects the ambient temperature in the housing 1.
[0030]
  The heater 11 for the heat exchanger 4 is held in contact with the outer surface of the body plate 21 of the heat exchange can body 2 as shown in detail in FIGS. 3 and 4. This holding is performed, for example, by a fastener member (for example, made of stainless steel) 111 that is externally fitted to the introduction pipe portion 42 of the heat exchanger 4. An energization line 112 for energizing the heater 11 to generate heat is supported and wired by a fastener member 141 described later.
[0031]
  On the other hand, a flexible temperature fuse 14 (not shown in FIG. 1) is disposed above the heater 11 in a cord shape (for example, a cord shape having a diameter of 5 to 10 mm). The thermal fuse 14 is supported by being suspended while being wound around the heat exchange can body 2 along the outer surface of the body plate 21 of the heat exchange can body 2. This suspension support is performed by fastener members 141, 141,... Having one end attached to the heat exchange can body 2 or the exhaust pipe 7, and by other fastener members 142 partially attached to the introduction pipe portion 42 or the like. Is also supported. The thermal fuse 14 is cut off in response to a predetermined high temperature, and the controller 15 (described later) receives the cut of conduction to forcibly stop the combustion of the combustion burner 5. That is, it is determined that a part of the body plate 21 of the heat exchange can body 2 is cracked and the combustion flame of the combustion burner 5 is blown out from the inside, and the combustion is forcibly stopped to prevent burning. Is supposed to do.
[0032]
  3 and 4, 931 is a signal line of the hot water temperature sensor 93, and the signal line 931 and the energization line 112 of the heater 11 are supported and wired by the fastener members 141 together with the temperature fuse 14. Yes.
[0033]
  A controller 15 (see FIG. 1) that performs hot water supply control by combustion operation control of the combustion burner 5 and freeze prevention control based on the water temperature sensor 84 and the atmospheric temperature sensor 13 is installed in the heat source machine having the above structure. Has been. The controller 15 includes a freeze prevention control unit 16 as shown in FIG. 5 in addition to the hot water supply control unit and the like. When the power outlet 151 is turned on and the power is turned on, the control by the freeze prevention control unit 16 is started. It is supposed to be. The operating power for the sensors 83, 84, 93, 94 and the heaters 11, 12 is supplied from the controller 15 via a power line.
[0034]
  The freeze prevention control unit 16 includes a normal processing unit 161, a prohibition processing unit 162, and a power-on processing unit 163. Hereinafter, the freeze prevention control by these processing units 161 to 163 will be described.
[0035]
  The normal processing unit 161 determines that there is a risk of freezing if the detected temperature from the ambient temperature sensor 13 is lower than a predetermined determination temperature, and turns each heater 11, 12, 12. While the heating operation is intermittently performed, if the detected temperature is higher than the determination temperature, it is determined that there is no risk of freezing, and the heaters 11, 12, 12,. .
[0036]
  The prohibition processing unit 162 performs the following processing prior to the processing by the normal processing unit 161 when the detected temperature of the ambient temperature sensor 13 is lower than the determination temperature. That is, the water detection means (incoming water temperature sensor) 84 is energized to detect the presence or absence of water. Only when it is detected that water is present, the processing (heating operation) by the normal processing unit 161 is permitted. When it is detected that there is not, the heating operation of only the heat exchanger heating heater 11 among the heating operation target heaters by the normal processing unit 161 is prohibited and the heating operation of the other heaters 12 is permitted. When the water detection means 84 detects that there is no water, it is energized every predetermined time interval until it is detected that there is water, and the detection of the presence or absence of water is repeated. Although the presence or absence of water may be constantly monitored, since it is not necessary, it is performed at predetermined time intervals.
[0037]
  Further, when the power outlet 151 is turned on and the power is turned on, the power-on processing unit 163 cancels the processing by the prohibition processing unit 162 until a predetermined time elapses from the time when the power is turned on. Thus, the processing by the normal processing unit 161 is executed as it is. When this predetermined time is assumed that there is residual water such as water droplets in the heat exchanger 4, the pipes 8, 9, 10, the water inlet fitting 81, the hot water outlet fitting 91, the incoming water flow rate sensor 83, etc., and it is frozen. In addition, a relatively short time is set in advance so that it can be thawed.
[0038]
  According to the anti-freezing control by the anti-freezing control unit 16 having the above configuration, first, it is determined whether or not the predetermined time has elapsed since the power-on time. If the predetermined time has not elapsed, the power-on processing is performed. The process by the unit 163 is executed. Thus, until the predetermined time elapses, the processing by the prohibition processing unit 162 is not executed and the processing by the normal processing unit 161 is performed. Even when the water remaining in a part is frozen, it is thawed. Therefore, the water flow can be resumed immediately. For this reason, avoiding the occurrence of a situation where water flow becomes impossible due to the fact that some residual water is frozen even if it is attempted to pass water in order to resume the use of the heat source machine after the previous draining drainage Will be able to.
[0039]
  On the other hand, if the above-mentioned predetermined time has elapsed, in principle, the processing by the normal processing unit 161 is executed, and if it is detected that there is no water in the heat exchanger 4 during the processing, it is prohibited as an exception. The heating operation of the heat exchanger heater 11 is prohibited by the processing unit 162. Accordingly, it is possible to reliably avoid occurrence of fusing due to the heating operation of the heater 11 of the thermal fuse 14 even if the thermal fuse 14 is disposed close to the heater 11 while preventing freezing. As a result, it is possible to reduce the size of the heat exchange can body 2 and thus the size of the entire housing 1 of the heat source machine without causing the problem of fusing of the thermal fuse.
[0040]
  As described above, it is possible to achieve both the prevention of fusing of the thermal fuse arranged close to the heater 11 for heating the heat exchanger and the avoidance of the situation in which the water cannot be recirculated due to the freezing of the residual water after draining and draining. Can be obtained.
[0041]
<Other embodiments>
  In addition, this invention is not limited to the said embodiment, Various other embodiments are included. That is, in the above-described embodiment, the self-heating type thermistor is used as the water detection means, but is not limited to this.
[0042]
  Further, as a heat source machine to which the freeze prevention control method of the present invention is applied, in addition to the above embodiment, a heat exchanger that is heat exchange heated by combustion heat is provided, and a freeze prevention heater is provided for this. The present invention can be applied regardless of the names of the bath tub, the hot water heater, etc. as long as it has a configuration.
[0043]
  Further, in the above embodiment, an outside air temperature detecting unit that detects the outside air temperature itself is provided instead of the ambient temperature sensor 13, and the detected temperature of the outside air temperature detecting unit is used instead of the detected temperature of the ambient temperature sensor 13 in the freeze prevention control. You may do it. Alternatively, the detected temperature from the incoming water temperature sensor 84, the outgoing hot water temperature sensor 93 or the hot water supply temperature sensor 94 may be used for determination in the freeze prevention control.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing an internal configuration of a heat source machine to which an embodiment of the present invention is applied.
FIG. 2 is a relationship diagram for explaining the principle of water presence / absence detection by a self-heating type thermistor.
FIG. 3 is an enlarged explanatory view of a heat exchanger part of the heat source apparatus of FIG. 1;
4 is an enlarged cross-sectional explanatory view taken along line AA in FIG. 3;
FIG. 5 is a block diagram showing the contents of a controller.
[Explanation of symbols]
4 Heat exchanger
5 Combustion burner (heat source)
8 Inlet pipeline (introductory pipeline)
9 Hot water pipeline (outflow pipeline)
11 Heater (heater that heats the heat exchanger)
12 Heater (heater for heating other parts)
13 Atmospheric temperature sensor (temperature detection means)
84 Water temperature sensor (water detection means)
16 Freezing prevention control unit
161 Normal processing unit
162 Prohibition processing part
163 Power-on processing section

Claims (4)

A heat exchanger that is heat-exchanged and heated by a heat source, an introduction pipe that introduces water to be heated into the heat exchanger, a lead-out pipe that is led out from the heat exchanger, and the heat exchange that is used for freeze prevention or thawing In the anti-freezing control method for a heat source device comprising: a heater that directly or indirectly heats the chamber; and temperature detection means for determining whether or not to perform anti-freezing control by heating operation of the heater.
Provide water detection means for detecting the presence or absence of water at least in the heat exchanger,
When it is detected by the water detection means that water is present, freezing prevention control according to the temperature detected by the temperature detection means is executed,
When the water detection means detects that there is no water, the heating operation of the heater is prohibited regardless of the temperature detected by the temperature detection means ,
When power is turned on to the heat source unit, anti-freezing control corresponding to the detected temperature is executed regardless of the detection result by the water detecting means until a predetermined time elapses after the power is turned on. freezing prevention control method of the heat source apparatus, characterized in that <br/> to. A heat exchanger that is heat-exchanged and heated by a heat source, an introduction pipe that introduces water to be heated into the heat exchanger, a lead-out pipe that is led out from the heat exchanger, and the heat exchange that is used for freeze prevention or thawing A heater for directly or indirectly heating the heater and a heater for heating other parts other than the heat exchanger, and a temperature detecting means for determining whether or not to perform anti-freezing control by these heaters In the anti-freezing control method of the heat source machine provided,
Provide water detection means for detecting the presence or absence of water at least in the heat exchanger,
When it is detected by the water detection means that water is present, freezing prevention control according to the temperature detected by the temperature detection means is executed,
When the water detecting means detects that there is no water, the heating operation of the heater for heating the heat exchanger is prohibited regardless of the temperature detected by the temperature detecting means, while the other part is heated. A freeze prevention control method for a heat source machine, characterized by permitting a heating operation of a heater for heating. A freeze prevention control method for a heat source machine according to claim 2 ,
When power is turned on to the heat source unit, anti-freezing control corresponding to the detected temperature is executed regardless of the detection result by the water detecting means until a predetermined time elapses after the power is turned on. A method for preventing freezing of a heat source machine. It is a freeze prevention control method of the heat source machine according to any one of claims 1 to 3,
A freeze prevention control method for a heat source device, wherein the water detection means is constituted by a self-heating type thermistor and the presence or absence of water is detected according to the degree of heat generation when the thermistor is energized.

Images