JP3669176B2 - Water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water supply device, and more particularly, to a device provided with a liquid fuel vaporization type combustion device that mixes and vaporizes a vaporized liquid fuel and supplied air.
[0002]
[Prior art]
In a hot water supply apparatus equipped with a conventional liquid fuel vaporization type combustion apparatus, for example, when the operation switch is turned on, a preparatory operation described below is executed, and a hot water supply request is not accepted until this preparatory operation ends. When there is a hot water supply request after the operation is completed, that is, when the currant is released, the hot water supply operation is started and the hot water supply operation is performed.
[0003]
The above-described preparatory operation refers to a process of heating a vaporizer that vaporizes liquid fuel or a mixing chamber that mixes vaporized fuel and air to a required temperature.
[0004]
[Problems to be solved by the invention]
In the above conventional example, when a hot water supply request is received after completion of the preparation operation, the requested hot water supply operation is executed regardless of the size of the requested hot water supply capacity (number of requested hot water supply numbers). The following problems may occur.
[0005]
That is, for example, when the required hot water supply number is on the upper limit side of the allowable capacity set in the hot water supply device, it is necessary to increase the supply amount of air or vaporized fuel to the combustion device, but in the initial stage of hot water supply, The carburetor and mixing chamber are temporarily cooled with a large amount of air and vaporized fuel, which tends to cause a reliquefaction phenomenon in which the vaporized liquid fuel reliquefies and releases white smoke. .
[0006]
This liquefaction phenomenon is not a problem for the device itself, but it sometimes falls into the sense that an abnormal situation has occurred for the user, and complains to the device manufacturer that the device has failed. May contact you.
[0007]
However, if the required hot water supply number is not too large, the supply amount of air and vaporized fuel can be relatively small, so the above-described reliquefaction phenomenon does not occur.
[0008]
Therefore, the present invention provides a hot water supply apparatus equipped with a liquid fuel vaporization type combustion apparatus, which can prevent the occurrence of reliquefaction of vaporized fuel in the initial stage of hot water supply even when suddenly a large capacity hot water supply is required. It is aimed.
[0009]
[Means for Solving the Problems]
In the present invention, in a hot water supply apparatus equipped with a liquid fuel vaporization type combustion apparatus, in the preparatory operation, the temperature state around the vaporization chamber is determined, and when it is cold, the control condition of the combustion apparatus is set so that the vaporized fuel does not re-liquefy. If the required hot water supply capacity is at the upper limit of the allowable capacity, for example, when the hot water supply is requested after the preparatory operation after the preparation operation, the hot water supply operation according to the required hot water supply capacity is not performed at the initial stage of hot water supply. The hot water supply capability in which the vaporized fuel is not re-liquefied is made to perform the hot water supply operation under the above-mentioned special condition that saves the capability.
[0010]
In short, when suddenly a large capacity hot water supply is requested, the combustion section is temporarily cooled by supplying a large amount of air or vaporized fuel to the combustion section of the combustion device by saving the hot water supply capacity in the initial stage of hot water supply. To prevent. As a result, the occurrence of a phenomenon in which vaporized fuel is reliquefied in the combustion section is avoided.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on embodiments shown in the drawings.
[0013]
1 to 7 relate to one embodiment of the present invention, FIG. 1 is a configuration diagram showing a hot water supply device, FIG. 2 is a configuration diagram of a liquid fuel vaporization combustion device in FIG. 1, and FIG. 3 is a hot water supply device. 4 is a flowchart showing details of the preparatory operation in FIG. 3, FIG. 5 is a flowchart showing details of the standby operation in FIG. 3, and FIG. 6 is a hot water supply operation in FIG. FIG. 7 is a flowchart showing details of the second system processing in the hot water supply operation in FIG. 3.
[0014]
In the figure, A indicates the entire hot water supply apparatus, and the hot water supply apparatus A includes a liquid fuel vaporization type combustion apparatus 1, a hot water supply circuit 2, a bath cooking circuit 3, a controller 4, and a remote controller 5. .
[0015]
The liquid fuel vaporization combustion apparatus 1 includes a heat exchange can 10, a vaporizer 20, a burner 30, a fuel supply unit 40, a blower 50, and a damper 60. In this combustion apparatus 1, liquid fuel such as kerosene supplied from the fuel supply means 40 is vaporized by the vaporizer 20, and this vaporized fuel is mixed with air supplied from the blower 50 at a required ratio and sent to the burner 30. The water passing through the heat exchange pipes 72 and 82 of the hot water supply circuit 2 and the bath cooking circuit 3 in the heat exchange can body 10 is heated by the combustion heat. The air supplied from the blower 50 and passed through the damper 60 is not only sent to the carburetor 20 side as primary air but also directly supplied to the burner 30 as secondary air, and a part of the secondary air is ineffective air. And passes through the heat exchange can 10.
[0016]
The hot water supply circuit 2 has a bypass mixing structure in which, for example, tap water or the like is mixed with hot water heated by the combustion device 1 and a part of tap water and discharged from a hot water supply curan (see broken line). The hot water supply circuit 2 includes an overflow valve 70, a water inlet pipe 71, a heat exchange pipe 72, a hot water outlet pipe 73, a bypass pipe 74, a hot water supply pipe 75, an incoming water flow rate sensor 76, an incoming water temperature sensor 77, and an outgoing hot water temperature sensor. 78, a hot water supply temperature sensor 79, and the like. The hot water supply pipe 75 is branched into a general hot water supply pipe 75a and a bath dropping hot water supply pipe 75b on the way.
[0017]
The bath cooking circuit 3 is configured to take out bathtub water of a bathtub (not shown), heat it to the required temperature with the combustion device 1 and return it to the bathtub, and can mix hot water at the required temperature from the hot water supply circuit 2. It has become. The bath reheating circuit 3 includes a bath return line 81, a heat exchange line 82, a bath return line 83, a bypass line 84, a circulation pump 85, a water flow switch 86, and the like.
[0018]
The controller 4 executes at least the processes shown in FIGS. In the hot water supply operation in FIG. 3, basically, when a hot water supply request is received, that is, when the hot water supply curan (see the broken line in FIG. 1) is opened, the incoming water flow rate sensor 76 detects the minimum operating water amount MOQ or more. The damper 60 is opened and closed so that the actual combustion heat amount approaches the necessary combustion heat amount by adding the combustion heat amount by the FB (feedback) control to the combustion heat amount by the FF (feed forward) control with respect to the necessary combustion amount. The air volume of 50 (the number of rotations by the blower fan 51) and the fuel supply amount by the constant flow pump 43 are controlled.
[0019]
The remote controller 5 is provided with at least an operation switch 91 and an operation lamp 92.
[0020]
Here, each component 10-60 of the said combustion apparatus 1 is demonstrated.
[0021]
In the heat exchange can body 10, the heat exchange pipes 72 and 82 of the hot water supply circuit 2 and the bath cooking circuit 3 are penetrated, and the vaporizer 20 and the burner 30 are arranged below the heat exchange can body 10. Has been.
[0022]
The vaporizer 20 vaporizes liquid fuel such as kerosene supplied from the fuel supply means 40. The diffusion vane 21, vaporizer heater 22, vaporizer temperature sensor 23, vaporization wall surface 24, mixing chamber 25, sub-heater 26, motor 27, an air supply temperature sensor 28, a motor rotation speed sensor 29, and the like. In the carburetor 20, the supplied liquid fuel is scattered on the surrounding vaporization wall surface 24 by rotating the diffusion blade 21 with a motor 27, and is vaporized by heat from the vaporization heater 22 and the sub-heater 26. ing. The vaporizer temperature sensor 23 detects the ambient temperature of the vaporizer 20 and the mixing chamber 25, and is composed of a thermistor or the like.
[0023]
The burner 30 ignites and burns vaporized fuel supplied from the vaporizer 20 and air supplied from the blower 50, and includes an igniter 31 and a flame detector 32.
[0024]
The combustion supply means 40 supplies kerosene from a kerosene tank (not shown) to the vaporizer 20, and includes a pumping pump 41, a sub tank 42, a constant flow pump 43, and the like.
[0025]
The blower 50 supplies air to the vaporizer 20 and the burner 30, and includes a blower fan 51, a drive motor 52, a rotation speed sensor 53, and the like.
[0026]
The damper 60 is provided in the middle of the ventilation path which connects the vaporizer 20 and the air blower 50, and controls the opening degree of this ventilation path. The damper 60 is displaced in two states by a driving means such as an electric motor (not shown), a position for closing the ventilation path (see the solid line in FIG. 2) and a position for opening the ventilation path (see the broken line in FIG. 2). The damper 60 here is in a state that allows the required ventilation without completely closing the ventilation path at the closed position.
[0027]
Next, operation | movement of the hot water supply apparatus A of the structure mentioned above is demonstrated using FIG.
[0028]
That is, when the operation switch 91 is turned on, the main flow of FIG. 3 is started, and the preparatory operation is executed in step S1, thereby setting the vaporizer 20 to the required first set temperature T1 (for example, 200 ° C.). . Until this preparatory operation ends, even if there is a hot water supply request, it will not be accepted. However, in this preparatory operation, the above-mentioned first set temperature T1 is set slightly lower so that the hot water supply request can be accepted as soon as possible.
[0029]
Then, it waits for hot water supply to be requested in step S2. This hot water supply request means when the hot water supply curan is opened or the like and the incoming water flow rate sensor 76 detects a minimum operating water amount MOQ or more.
[0030]
Here, if there is no request for hot water supply, by performing a standby operation in step S3, while maintaining the temperature of the vaporizer 20 at a second set temperature T2 (for example, 210 ° C.) slightly higher than that during the preparatory operation, Wait for hot water supply request.
[0031]
On the other hand, if there is a hot water supply request, the required output number, that is, the required amount of combustion heat is calculated based on data such as the required hot water flow rate, the required hot water supply temperature, and the incoming water temperature in step S4, and then the hot water supply operation is executed in step S5.
[0032]
In the middle of this hot water supply operation, when the hot water supply curan is closed or the like and the incoming flow rate sensor 76 detects less than the minimum operating water amount MOQ, this is recognized in step S6, the hot water supply operation is stopped, and the flow returns to step S2. Wait for the next hot water supply.
[0033]
Next, details of the preparation operation in step S1, the standby operation in step S3, and the hot water supply operation in step S5 will be described with reference to FIGS.
[0034]
(Preparation Operation) As shown in the subroutine of FIG. 4, it is determined in step S10 whether or not the temperature of the vaporizer 20 is lower than a first set temperature T1 (for example, 200 ° C.). Here, when the temperature is lower than the first set temperature T1, the normal preparation process of steps S11 to S14 is executed. When the temperature is equal to or higher than the first set temperature T1, the simplified preparation process of steps S15 to S18 is executed.
[0035]
First, in the normal preparation process, after the A flag is set to “0” in step S11, both the vaporization heater 22 and the sub-heater 26 are continuously turned on in step S12. In step S13, the detected temperature Tx of the vaporizer temperature sensor 23 is the first. Waiting for the set temperature T1 (for example, 200 ° C.) or higher to be reached, and when the first set temperature T1 or higher is reached, the operation lamp 92 is turned on in step S14 to notify that the hot water supply request can be accepted and set the B flag to “1”. Then, the process returns to step S2 of the main flow shown in FIG. The A flag indicates whether or not the sub heater 26 has been turned on for a required time in the standby operation. When the operation switch 91 is turned off, the state at that time is stored. The B flag indicates whether or not to save the number in the hot water supply operation. When the operation switch 91 is turned off, the B flag is forcibly set to “0”.
[0036]
On the other hand, in the simplified preparation process, it is notified in step S15 that the hot water supply request can be accepted by turning on the operation lamp 92, and in step S16, the detected temperature Tx of the vaporizer temperature sensor 23 is the second set temperature T2 (for example, 210 ° C.). It is determined whether it is above. Here, when the temperature is lower than the second set temperature T2, the process proceeds to step S11 of the normal mode. When the temperature is equal to or higher than the second set temperature T2, it is determined whether or not the A flag is “1” in the subsequent step S17. judge. If it is determined in step S17 that the A flag is “0”, the process proceeds to step S12 in the normal mode. If it is determined that the flag is “1”, the B flag is set to “0” in step S18. Then, the process proceeds to step S2 of the main flow shown in FIG.
[0037]
In the preparatory operation of this embodiment, in addition to the original function of heating the vaporizer 20 to a state where it can accept a hot water supply request, the temperature of the vaporizer 20 is sufficiently warm, for example, when hot water supply is repeated in a short time. Since it may be in a state, it is made fluid such as selecting whether or not to drive the vaporizing heater 22 and the sub heater 26 as necessary. Moreover, in this preparatory operation, if the area around the carburetor 20 is warm as in the case where the hot water supply operation is performed intermittently, it is assumed that the reliquefaction phenomenon does not occur during the subsequent hot water supply operation. However, if the area around the carburetor 20 is locally cooled, it is determined to save the number as a reliquefaction phenomenon occurs during the subsequent hot water supply operation. . Note that the issue number save is B flag “1”, and issue number not save is B flag “0”.
[0038]
(Standby operation) As shown in the subroutine of FIG. 5, it is determined in step S20 whether or not the A flag is "0". Here, when the A flag is “1”, the detected temperature Tx of the vaporizer temperature sensor 23 is maintained at the second set temperature T2 (for example, 210 ° C.) by performing on / off control of the vaporization heater 22 in step S21. Thus, it returns to step S2 of the main flow shown in FIG. 3, and waits for a hot water supply request. In step S21, the sub-heater 26 is off. The vaporization heater 22 is turned off when the temperature Tx detected by the vaporizer temperature sensor 23 reaches the second set temperature T2 + 5 ° C., and is turned on when the temperature reaches the second set temperature T2-5 ° C.
[0039]
On the other hand, if it is determined in step S20 that the A flag is “0”, the detected temperature Tx of the vaporizer temperature sensor 23 is set to the second set temperature T2 by performing on / off control of the vaporization heater 22 in step S22. (For example, it is 210 degreeC) It moves to following step S23. In step S22, the state of the sub heater 26 turned on in the preparation operation is continued. In step S23, it is determined whether or not a required time (for example, 5 minutes) has elapsed since the operation lamp 92 was lit in the preparation operation. If not, the process proceeds to step S2 of the main flow shown in FIG. However, when the time elapses, the A flag is set to “1” in step S24 and the sub-heater 26 is turned off, and the process returns to step S2 of the main flow shown in FIG.
[0040]
In the standby operation of this embodiment, in addition to the original function of enabling a hot water supply operation immediately in response to a hot water supply request in a state where the temperature of the vaporizer 20 is maintained at the second set temperature T2, a short hot water supply operation is performed. When repeatedly performing the above, it is possible to prevent the vaporizer 20 from being heated more than necessary by the sub heater 26.
[0041]
(Hot-water supply operation) In this hot-water supply operation, the processing of two independent systems shown in FIGS. 6 and 7 is simultaneously performed in parallel. In addition, the 1st system process shown in FIG. 6 is a process regarding the combustion part temperature control system of the vaporizer | carburetor 20, and the 2nd system process shown in FIG. 7 is a process regarding a combustion and a hot water control system.
[0042]
First, in the first system process shown in FIG. 6, it is determined in step S30 whether or not the detected temperature Tx of the vaporizer temperature sensor 23 is lower than a third set temperature T3 (for example, 280 ° C.). Here, when the temperature is lower than the third set temperature T3, both the vaporization heater 22 and the sub heater 26 are forcibly turned on for a required time (for example, 10 seconds) in step S31. Step S31 is omitted and the process jumps to Step S32.
[0043]
In step S32, it is determined whether or not the damper 60 needs to be opened based on the required hot water supply number obtained in step S4 of the main flow shown in FIG. If it is determined that the damper 60 is to be closed, it is determined in step S33 whether or not the A flag is “1”. If “1”, the vaporization heater 22 is turned on in the subsequent step S34. -While controlling off, the sub-heater 26 is interlocked with the vaporizing heater 22 so that the detected temperature Tx of the vaporizer temperature sensor 23 is maintained at the fourth set temperature T4 (for example, 230 ° C), and steps S35 to S38 are omitted. The process proceeds to step S6 of the main flow shown in FIG. 3, but if the A flag is “0”, the following step S35 is performed. The vaporization heater 22 is turned off when the detected temperature Tx of the vaporizer temperature sensor 23 reaches the fourth set temperature T4 + 5 ° C., and is turned on when the fourth set temperature T4-5 ° C.
[0044]
On the other hand, if it is determined in step S32 that the damper 60 is opened, the temperature detected by the carburetor temperature sensor 23 is controlled by turning on and off the vaporization heater 22 with the sub heater 26 turned on in step S35. Tx is maintained at the fourth set temperature T4 (for example, 230 ° C.), and the process proceeds to the subsequent step S36. The vaporization heater 22 is turned off when the detected temperature Tx of the vaporizer temperature sensor 23 reaches the fourth set temperature T4 + 5 ° C., and is turned on when the fourth set temperature T4-5 ° C. In this step S36, it is determined whether or not the A flag is “0”. In the case of “1”, steps S37 and S38 are skipped and the process proceeds to step S6 of the main flow shown in FIG. 3, but in the case of “0”, the operation lamp 92 is turned on in the preparatory operation in the following step S37. It is determined whether or not a required time (for example, 5 minutes) has elapsed. When it is determined in step S37 that the time has not elapsed, the following step S38 is skipped and the process proceeds to step S6 of the main flow shown in FIG. 3, but when it is determined that the time has elapsed, the A flag is set to “1” in subsequent step S38. Then, the process proceeds to step S6 of the main flow shown in FIG.
[0045]
In the first system process of the hot water supply operation of this embodiment, the following devices are incorporated. First, in order to prevent the temperature of the vaporizer 20 from being lowered by the air or vaporized fuel supplied with the start of hot water supply, step S31 is executed. Secondly, if step S31 is executed regardless of the temperature of the vaporizer 20, the vaporizer 20 is heated more than necessary in a situation where a short time hot water supply operation is repeated. Thus, the temperature of the vaporizer 20 is monitored to determine whether or not step S31 is executed. Third, when the damper 60 is in the open state and the amount of blown air is increased, the carburetor 20 can be easily cooled, so that the sub-heater 26 is turned on in step S35. Further, when the damper 60 is in the closed state, it is considered that the mixing chamber 25 is harder to cool than in the open state, but the state of the A flag is determined in step S33, and the mixing chamber 25 is too warm. If not, the sub-heater 26 is always turned on to warm up.
[0046]
Next, in the second system processing shown in FIG. 7, it is determined in step S40 whether or not issue number saving is necessary based on whether or not the B flag is “1”. Here, if it is “0”, the normal number processing shown in steps S41 to S43 is performed as it is not necessary to save the number, and if it is “1”, it is determined that the number number needs to be saved in steps S44 to S46. Each special process shown is executed.
[0047]
First, in the normal process, it is determined in step S41 whether or not the required hot water supply number is the maximum hot water supply number (for example, 27) having an allowable capacity (5 to 27). Here, when the number is the maximum number of hot water supplies, combustion control is performed at the maximum number of hot water supplies as requested in step S42, and the amount of hot water discharged to the hot water supply curan (see the broken line in FIG. 1) is controlled by the overflow valve 70. If it is not the maximum number of hot water supplies, combustion control is performed with the required number of hot water supplies in step S43 and the overflow valve 70 is fully opened. After these steps S42 and S43, the process proceeds to step S6 of the main flow shown in FIG.
[0048]
On the other hand, in the special process, it is determined in step S44 whether or not the required hot water supply number is less than the save specified number (for example, 16). Here, if it is less than the specified number of saves, it is assumed that there is no concern about the occurrence of the reliquefaction phenomenon and the combustion control is performed as required in step S45 and the overflow valve 70 is fully opened. In some cases, the opening degree of the overflow valve 70 is controlled so as to ensure the amount of hot water corresponding to the specified number of saves while starting combustion control at the specified number of saves (for example, No. 16) in step S46. . After these steps S45 and S46, the process proceeds to step S6 of the main flow shown in FIG.
[0049]
In step S46, the hot water temperature requested by the user is ensured at the expense of the amount of hot water. Then, by repeating steps S44 and S46, the required hot water number is started from the specified number of saved hot water over the required time (for example, 30 seconds), and hot water is supplied as required. That is, if the required hot water supply capacity is set to No. 20, first, combustion control is started with the specified number of saves (No. 16) in Step S46, but it is gradually increased to No. 20 by repeating Step S46. The combustion control at No. 20 is continued until the hot water supply is stopped or the required hot water supply capacity is changed thereafter.
[0050]
In the second system processing of the hot water supply operation of this embodiment, for example, if the surroundings of the carburetor 20 are sufficiently warm as in the case where the hot water supply operation is intermittently performed, suddenly a large number of hot water supplies is required. However, if the area around the vaporizer 20 is cold and easily liquefied, the number will be saved when a large hot water supply is suddenly requested, and a reliquefaction phenomenon will occur. Try to prevent. In addition, when saving the number, it ensures that the hot water temperature is as high as required so that the user's request can be answered.
[0051]
As described above, in this embodiment, even when a large number of hot water supply is suddenly requested in the hot water supply operation, the combustion of the number is gradually performed as required as combustion control of the number that does not cause reliquefaction at the start of hot water supply. Since the control is started, it is possible to prevent a phenomenon in which the liquid fuel once vaporized in the vaporizer 20 is reliquefied in the mixing chamber 25.
[0052]
In addition, in the above-described embodiment, regarding the preparatory operation, whether or not the preheating operation is necessary for the vaporizer 20 is grasped according to the cooling / heating state of the vaporizer 20 at the start time, and the preheating operation is performed in any state. The waste of doing so can be omitted. Therefore, for example, if the carburetor 20 is sufficiently warmed by intermittent hot water supply, the preheating operation can be omitted, so that a hot water supply request can be accepted at an early stage and energy saving in the preparatory operation can be achieved. Contributes to cost reduction.
[0053]
Further, in the above-described embodiment, whether or not the heating operation by the sub-heater 26 is necessary is grasped according to the cooling / heating state of the vaporizer 20, particularly the mixing chamber 25 of the vaporizer 20 at the start of the standby operation, and the sub-heater 26 is in any state. It is possible to eliminate the waste of performing the heating operation. Therefore, energy saving in standby operation can be achieved, which can contribute to reduction of running cost.
[0054]
Further, in the above embodiment, when the temperature of the vaporizer 20 at the start of the first system process of the hot water supply operation is particularly low, the vaporization heater 22 and the sub-heater 26 are immediately forcibly turned on to vaporize. In addition to preventing re-liquefaction of fuel, re-liquefaction measures are selectively performed to prevent abnormal overheating due to the above-mentioned re-liquefaction measures when intermittent hot water supply is performed. Yes.
[0055]
Further, in the above embodiment, when the number saving is performed for the second system processing of the hot water supply operation, since the hot water temperature is ensured as requested at the expense of the hot water amount, the user is dissatisfied. You don't have to.
[0056]
In addition, this invention is not limited only to the said embodiment, A various application and deformation | transformation can be considered.
[0058]
(2) In the above embodiment, the present invention includes the standby operation shown in FIG.
[0059]
【The invention's effect】
In the present invention , for example, even when a large number of hot water supply is suddenly requested in a state where the combustion section of the combustion device is cold, the occurrence of a phenomenon in which vaporized fuel once vaporized in the combustion device in the initial stage of hot water supply is reliquefied is avoided. be able to.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a hot water supply apparatus of the present invention. FIG. 2 is a block diagram showing a controller in FIG. 1. FIG. 3 is a flowchart used to explain the operation of the hot water supply apparatus in FIG. FIG. 5 is a flowchart showing details of the standby operation in FIG. 3. FIG. 6 is a flowchart showing details of the standby operation in FIG. 3. FIG. 6 is a flowchart showing details of the first system processing in the hot water supply operation in FIG. Flowchart showing details of second system processing in hot water supply operation in FIG.
A Hot water supply apparatus 1 Combustion apparatus 2 Hot water supply circuit 4 Controller 10 Heat exchange can body 20 of combustion apparatus Vaporizer 22 of combustion apparatus Vaporization heater 23 of combustion apparatus Vaporizer temperature sensor 26 of combustion apparatus Sub heater 30 of combustion apparatus 30 Burner 40 of combustion apparatus Fuel supply means 50 Combustion device blower 60 Combustion device damper 71 Hot water supply circuit inlet water line 72 Hot water supply circuit heat exchange line 73 Hot water supply circuit hot water supply line 91 Operation switch

Claims (1)

A liquid fuel vaporization type combustion device that mixes and vaporizes vaporized liquid fuel and air, water is passed from one end side to the other end side, and a midway portion penetrates the combustion portion of the combustion device. Including a heat exchange line and a control device for controlling the combustion device in response to a hot water supply request,
In response to the start command, the control device sets the carburetor included in the combustion device to a required preheating temperature and prepares a preparatory operation for accepting the hot water command, and responds to the hot water command. A hot water supply operation executing means for executing a hot water supply operation for performing hot water supply,
The preparatory operation execution means provides temperature determination means for determining whether or not the temperature around the carburetor of the combustion apparatus is higher than necessary, and applies preheating to the carburetor of the combustion apparatus when the temperature determination means determines that the temperature is low. On the other hand, the management means that does not give preheating to the vaporizer of the combustion device when it is determined to be high, and the control condition of the combustion device in the subsequent hot water supply operation when it is determined that the temperature determination means is high, Special conditions that save the ability not to correspond to the reliquefaction conditions for the control conditions of the combustion apparatus in the initial stage of hot water supply in the subsequent hot water supply operation when it is determined that the temperature is low by the temperature determination means, while determining the appropriate normal conditions Determining means for determining
The hot water supply operation executing means includes condition determining means for determining what the condition determined by the determining means is, and re-determining whether the required hot water supply capacity corresponds to the reliquefaction condition of vaporized fuel in the combustion device. When the liquefaction determining means and the condition determining means determine that the normal condition is satisfied, and when the condition determining means determines that the special condition is satisfied and the reliquefaction determining means determines that the condition is not met, the combustion apparatus is controlled according to the normal condition. On the other hand, including a management means for controlling the combustion device under the special condition at the initial stage of hot water supply when the condition judgment means judges that the special condition is met and the reliquefaction judgment means judges that the condition is met. Hot water supply device.

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