JP2014149142A - Hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply device capable of confirming that a heat exchanger is successfully cleaned.SOLUTION: When a hot water supply operation is started according to a heat exchanger state confirmation command, a heat exchanger state determining portion 12 executes a heat exchanger good state determination processing by measuring an after-boiling up temperature Tup as an increase width of a detection temperature of a heat exchanger outlet temperature sensor 26 from a time point of stopping the hot water supply operation, when the hot water supply operation is stopped, and comparing the after-boiling up temperature Tup with a first threshold value temperature Ath, and notifies a heat exchanger good state when the after-boiling up temperature Tup is lower than the first threshold value temperature. When the hot water supply operation is started without depending on the heat exchanger state confirmation command, the heat exchanger state determining portion 12 executes a heat exchanger clogging determination processing by measuring the after-boiling up temperature Tup when the hot water supply operation is stopped, and comparing the after-boiling-up operation with a second threshold value temperature Bth higher than the first threshold value temperature Arth, and notifies the clogging of the heat exchanger when the after-boiling up temperature Tup is higher than the second threshold value temperature Bth.

Description

  The present invention relates to a hot water supply apparatus that supplies hot water by heating water flowing through a heat exchanger with a burner.

  2. Description of the Related Art Conventionally, there is known a hot water supply apparatus that includes a heat exchanger connected to a water supply pipe and a hot water supply pipe, and a burner that heats the heat exchanger, and heats water flowing through the heat exchanger (for example, patents). Reference 1).

  When water is supplied from the water supply to the heat exchanger provided in the hot water supply device via the hot water supply pipe, impurities such as calcium carbonate and calcium hydroxide are dissolved in the water supplied from the water supply There are many. And if these impurities crystallize in the flow path (heat transfer tube) of the water in the heat exchanger and become lime scale and adhere to the heat transfer tube, the heat conduction in the heat exchanger is hindered and the performance of the hot water supply device is reduced. descend.

  Therefore, in the hot water supply apparatus described in Patent Document 1, as the lime scale adheres to the heat transfer tube of the heat exchanger, when the hot water supply is stopped, the temperature of the water in the heat exchanger rises due to residual heat ( Focusing on the fact that the post-boiling temperature becomes higher, an abnormality of the heat exchanger due to adhesion of lime scale is detected.

JP 2008-138952 A

  When an abnormality of the heat exchanger due to adhesion of lime scale is detected, a washing circuit for removing scale is connected to the water flow path of the water heater including the heat exchanger to form a circulation circuit, and this circulation is performed by the pump. The cleaning liquid is circulated in the circuit to remove the lime scale adhering to the heat transfer tube of the heat exchanger.

  However, when the removal of the lime scale by this treatment is insufficient, after the cleaning tube is removed and the use of the hot water supply device is resumed, an abnormality of the heat exchanger due to the adhesion of the scale is detected after a short period of time. Therefore, there is a disadvantage that the descaling process must be performed again.

  This invention is made | formed in view of this background, and it aims at providing the hot-water supply apparatus which can confirm that the washing | cleaning of the heat exchanger was performed favorably.

The present invention has been made to achieve the above object, and the hot water supply apparatus of the present invention comprises:
A heat exchanger connected to the water supply pipe and hot water supply pipe;
A burner for heating the heat exchanger;
A heat exchanger outlet temperature sensor for detecting the temperature of water in the heat exchanger near the connection point between the heat exchanger and the hot water supply pipe or the hot water supply pipe;
A running water sensor for detecting the presence or absence of running water in the heat exchanger;
When flowing water is detected by the flowing water sensor, a hot water supply operation is performed in which the burner is burned to heat the water flowing in the heat exchanger, and when flowing water is not detected by the flowing water sensor, A hot water supply control unit for stopping the hot water supply operation with the burner extinguished,
When the hot water supply operation is started in response to a predetermined heat exchange state confirmation instruction, when the hot water supply operation is stopped, the detected temperature increase of the heat exchange outlet temperature sensor from the time when the hot water supply operation is stopped A post-boiling temperature is measured, and a post-boiling temperature determination process is performed to compare the post-boiling temperature with the first threshold temperature. When the post-boiling temperature is lower than the first threshold temperature, a predetermined heat Good news
When the hot water supply operation is started without depending on the heat exchange state confirmation instruction, the post boiling temperature is measured when the hot water supply operation is stopped, and the post boiling temperature is higher than the first threshold temperature. A heat exchange state determination unit that executes heat exchange blockage determination processing for comparison with the second threshold temperature and performs predetermined heat exchange blockage notification when the post-boiling temperature is higher than the second threshold temperature. It is characterized by.

  According to this invention, when the clogging of the lime scale in the heat exchanger proceeds, the heat exchange clogging notification is made when the heat exchange clogging determination process is executed by the heat exchange state determination unit. The user can recognize the clogging of the heat exchanger by the heat exchange clogging notification and can request a maintenance company or the like to clean the heat exchanger.

  Then, when an operator such as a maintenance company finishes the heat exchanger cleaning operation, the heat exchange state determination unit instructs the heat exchange state determination unit to execute the heat exchange state determination process. Can do. In the heat exchange good determination process, the post-boiling temperature is compared with the first threshold temperature lower than the second threshold temperature used in the heat exchange blockage determination process, and the post-boiling temperature is set to the first threshold value. When the temperature becomes lower than the temperature, the good heat exchange notification is made. Therefore, the operator can confirm that the heat exchanger has been cleaned well by recognizing the cleaning completion notification.

  Further, in the present invention, the heat exchange state determination unit is configured so that the detected temperature of the heat exchange outlet temperature sensor becomes a predetermined determination temperature when the heat exchange state confirmation instruction is given. The hot water supply operation is executed, and the first threshold temperature is set according to the determination temperature.

  In this case, the heat exchange good determination process is performed based on the post-boiling temperature from the state in which the temperature of the water near the outlet of the heat exchanger is maintained at the determination temperature. It can be determined with higher accuracy that the vessel has been successfully cleaned.

In the present invention,
The heat exchange state determination unit is characterized in that, in the heat exchange good determination process, when the post-boiling temperature is equal to or higher than the first threshold temperature, the heat exchange state determination unit performs notification for urging the heat exchanger to be cleaned.

  In this case, when cleaning of the heat exchanger is insufficient, it is possible to prompt the operator to perform cleaning again. Therefore, it is possible to prevent an operator from completing the cleaning operation of the heat exchanger while the cleaning of the heat exchanger is insufficient.

The block diagram of a hot-water supply apparatus. Explanatory drawing of the determination of the clogging of the heat exchanger by adhesion | attachment of a lime scale, and the determination that the heat exchanger was wash | cleaned favorably. Explanatory drawing of the connection aspect of a washing machine. The flowchart of the washing | cleaning operation | work of a heat exchanger. The flowchart of a heat exchange favorable determination process. The flowchart of the setting process of temperature for a determination and 1st threshold temperature.

  An embodiment of the present invention will be described with reference to FIGS. Referring to FIG. 1, hot water supply apparatus 1 of the present embodiment is configured by apparatus main body 2 and remote controller 50 connected to apparatus main body 2 by communication cable 60.

  In the apparatus main body 2, a heat exchanger 21 provided in the combustion chamber 20, a burner 22 disposed below the heat exchanger 21 to heat the heat exchanger 21, and combustion air is supplied to the burner 22. A combustion fan 23 and a gas proportional valve 25 provided in a gas supply pipe 24 connected to the burner 22 to change the flow rate of the fuel gas supplied to the burner 22 are provided.

  The inlet side of the heat exchanger 21 is connected to the water supply pipe 30, and the outlet side of the heat exchanger 21 is connected to the hot water supply pipe 31. Further, a bypass pipe 32 that bypasses the heat exchanger 21 and communicates the water supply pipe 30 and the hot water supply pipe 31 is provided.

  The water supply pipe 30 is connected to a water pipe 41 through a manual water supply switching valve 40, and the hot water supply pipe 31 is connected to a hot water supply pipe 43 through a manual hot water supply switching valve 42. In FIG. 1 and FIG. 3 to be described later, the valve opening locations of the water supply switching valve 40 and the hot water supply switching valve 42 are indicated by white triangles, and the valve closing locations are indicated by black triangles.

  In FIG. 1, the valves below the water supply switching valve 40 and the hot water supply switching valve 42 are closed, the water supply switching valve 40 communicates with the water pipe 41 and the water supply pipe 30, and the hot water supply switching valve 42 has a hot water supply pipe 43. And the hot water supply pipe 31 are in communication with each other. Therefore, when the user opens the currant 44, as indicated by the arrow, water is supplied from the water pipe 41 to the water supply pipe 30, and the water heated by the heat exchanger 21 and the water via the bypass pipe 32 are separated. They are mixed and supplied from the hot water supply pipe 31 through the hot water supply pipe 43 and from the currant 44.

  On the upstream side of the connection point of the water supply pipe 30 with the bypass pipe 32, a water flow sensor 29 for detecting the flow rate of the water flowing through the water supply pipe 30 (a water flow sensor for detecting the presence or absence of water flow in the heat exchanger of the present invention). And a water supply variable valve 28 that changes the opening degree of the water supply pipe 30 is provided. A heat exchange outlet temperature sensor 26 for detecting the temperature of water in the hot water supply pipe 31 is provided near the connection location of the hot water supply pipe 31 with the heat exchanger 21, and downstream of the connection location of the hot water supply pipe 31 with the bypass pipe 32. On the side, a hot water supply temperature sensor 27 for detecting the temperature of hot water supplied from the hot water supply pipe 31 to the hot water supply pipe 43 is provided.

  In addition, the apparatus main body 2 is provided with a controller 10 that controls the overall operation of the hot water supply apparatus 1. The controller 10 is an electronic circuit unit including a CPU, a memory, various interface circuits, and the like (not shown). By executing a control program for the hot water supply device 1 held in the memory, the controller 10 and the heat exchanger It functions as the state determination unit 12.

  The hot water supply control unit 11 performs the hot water supply operation with the burner 22 in a combustion state when the current flow sensor 29 detects the flow rate equal to or higher than the ignition flow rate (when flowing water is detected). When 44 is closed and the flow rate detected by the flowing water sensor 29 becomes less than the ignition flow rate (when no flowing water is detected), the burner 22 is extinguished and the hot water supply operation is stopped. In the hot water supply operation, the hot water supply control unit 11 adjusts the opening degree of the gas proportional valve 25 and the rotation speed of the combustion fan 23 so that the detected temperature of the hot water supply temperature sensor 27 becomes the target hot water supply temperature set by the remote controller 50. Thus, the combustion amount of the burner 22 is changed.

  The heat exchange state determination unit 12 performs heat exchange blockage determination processing for determining whether the heat exchanger 21 is blocked due to adhesion of lime scale. The heat exchange state determination unit 12 does not depend on a “heat exchange state confirmation instruction” by an operation of the remote controller 50 described later (the operator operates the “heat exchange state confirmation instruction” and opens the currant 44 according to the voice guidance. Except for the case), when the currant is opened and the hot water supply operation is started, the heat exchange clogging determination process is executed.

  In the heat exchanger clogging determination process, the heat exchanger state determination unit 12 determines whether the heat exchanger outlet temperature sensor 26 from the time when the hot water supply operation is stopped when the hot water supply operation is stopped after continuing for a predetermined time (for example, 10 minutes) or longer. A post-boiling temperature Tup, which is an increase width of the detected temperature (hereinafter referred to as heat exchange outlet temperature Tout), is measured. Then, the heat exchange state determination unit 12 compares the post-boiling temperature Tup with the second threshold temperature Bth, which is a threshold for determining clogging of the heat exchanger 21 due to adhesion of lime scale, and the post-boiling temperature Tup is When the temperature is higher than the second threshold temperature Bth, an error is displayed on the display 51 of the remote controller 50 and a voice guidance “Please clean the heat exchanger” is output from the speaker 56.

  In addition, the heat exchange state determination unit 12 is configured such that an operator who has cleaned the heat exchanger 21 to be described later presses and operates a “heat exchange state confirmation instruction” (for example, the UP switch 53 and the DOWN switch 54 simultaneously) using the remote controller 50. In the state, it is determined that the lime scale of the heat exchanger 21 is removed and the water flow of the heat exchanger 21 is improved when a special operation such as pressing the operation switch 55 is performed. The heat exchange good judgment process is executed. The heat exchange good determination process will be described later.

  Here, in FIG. 2, the horizontal axis is set to the heat exchange outlet temperature Tout when the hot water supply operation is stopped, the vertical axis is set to the post-boiling temperature Tup, and the heat exchange outlet temperature Tout and the post-boiling temperature Tup are set. It shows the correspondence. In FIG. 2, A shows the correspondence in the state where lime scale is not attached in the heat exchanger 21 (for example, when the hot water supply device 1 is newly installed and started to be used, or at the time of shipping inspection at the factory). Show. Moreover, B has shown the correspondence in the state in which the adhesion | attachment of the lime scale in the heat exchanger 21 advanced.

  When the heat exchange outlet temperature Tout at the time when the hot water supply operation is stopped is the same, the post-boiling temperature Tup increases as the lime scale in the heat exchanger 21 adheres (changes from A to B). . For example, when the heat exchange outlet temperature Tout is 69 ° C., the post-boiling temperature Tup is 11 ° C. in P2 where no lime scale is attached in the heat exchanger 21. Further, in P1, where the lime scale adheres in the heat exchanger 21, the post-boiling temperature Tup is 30 ° C.

  Therefore, in the present embodiment, the second threshold temperature Bth for determining heat exchange blockage is determined according to the heat exchange outlet temperature Tout as shown in FIG. Further, the heat exchange state determination unit 12 sets the first threshold temperature Ath for determining that the water flow state of the heat exchanger 21 is good according to the heat exchange outlet temperature Tout as shown in FIG. decide.

  Next, the cleaning operation of the heat exchanger 21 will be described according to the flowchart shown in FIG. 4 with reference to FIG. As shown in FIG. 3, the cleaning operation of the heat exchanger 21 is performed by connecting the cleaning machine 70 to the hot water supply device 1.

  The cleaning machine 70 includes a cleaning liquid tank 73 in which a cleaning liquid 74 (acetic acid or the like) for removing lime scale is stored, a cleaning forward pipe 71 and a cleaning return pipe 72 having one end disposed in the cleaning liquid tank 73, and a cleaning forward pipe 71. Are provided, and a circulation pump 75 for sucking the cleaning liquid 74 in the cleaning liquid tank 73 into the cleaning forward pipe 71 and a timer 76 for confirming the cleaning execution time are provided.

  The worker who cleans the heat exchanger 21 first stops the operation of the hot water supply apparatus 1 in STEP 1 and drains the hot water supply apparatus 1 in STEP 2 according to the flowchart of FIG. In subsequent STEP 3, as shown in FIG. 3, the operator connects the cleaning forward pipe 71 to the water supply switching valve 40 and connects the cleaning return pipe 72 to the hot water switching valve 42 to connect the cleaning machine 70 to the hot water supply device. Attach to 1.

  In the next STEP 4, the operator operates the water supply switching valve 40 to close the flow path from the water pipe 41 to the water supply pipe 30 and open the flow path from the cleaning forward pipe 71 to the water supply pipe 30. Switch to. Further, the operator operates the hot water supply switching valve 42 to switch to a state where the flow path from the hot water supply pipe 31 to the hot water supply pipe 43 is closed and the flow path from the hot water supply pipe 31 to the cleaning return pipe 72 is opened.

  In subsequent STEP 5, the operator activates the circulation pump 75. As a result, the cleaning liquid circulates through the flow path of the cleaning liquid tank 73 → the cleaning forward pipe 71 → the water supply pipe 30 → the heat exchanger 21 / bypass pipe 32 → the hot water supply pipe 31 → the cleaning return pipe 72 → the cleaning liquid tank 73 to exchange heat. Removal of the lime scale in the vessel 21 is started.

  In the next STEP 6, the worker starts the timer 76. When the timer 76 expires in STEP 7, the worker stops the circulation pump 75 in STEP 8. In subsequent STEP 9, the operator extracts the cleaning liquid from the hot water supply device 1, and in STEP 10, the operator operates the water supply switching valve 40 to close the flow path from the cleaning forward pipe 71 to the water supply pipe 30, and the water pipe 41. To the state where the flow path from the water supply pipe 30 to the water supply pipe 30 is opened. Further, the operator operates the hot water supply switching valve 42 to switch to a state where the flow path from the hot water supply pipe 31 to the cleaning return pipe 72 is closed and the flow path from the hot water supply pipe 31 to the hot water supply pipe 43 is opened.

  By operating the water supply switching valve 40 and the hot water supply switching valve 42, the hot water supply operation of the hot water supply device 1 becomes possible. Then, in the next STEP 11, the operator performs a “heat exchange state confirmation instruction” by operating the remote controller 50 to instruct execution of the heat exchange good determination process. Although details of the heat exchange state determination processing will be described later, when it is determined that the heat exchanger 21 has been cleaned well, a voice guidance “cleaning is OK” is output from the speaker 56 of the remote controller 50. . The output of the voice guidance “This is OK for cleaning” corresponds to the good heat exchange notification of the present invention.

  When the heat exchanger 21 is not sufficiently cleaned, a voice guidance “Please clean again” is output from the speaker 56 of the remote controller 50. The output of the voice guidance “please re-clean” corresponds to a notification that prompts cleaning of the heat exchanger of the present invention.

  In addition, notification of good heat exchange and notification for prompting re-cleaning of the heat exchanger may be performed by a method other than the output of voice guidance. For example, the notification may be performed by displaying on the display 51 of the remote controller 50 or by outputting a buzzer sound from the speaker 56.

  In subsequent STEP 12, the operator recognizes the voice guidance ("cleaning is OK" or "please re-clean"), and determines whether or not the cleaning has been performed satisfactorily. Then, when the cleaning is performed well (when the voice guidance that “cleaning is OK” is given), the process proceeds to STEP 13, and the operator removes the cleaning forward pipe 71 from the water supply switching valve 40 and also supplies the hot water supply switching valve. The washing return pipe 72 is removed from 42, the washing machine 70 is removed from the hot water supply apparatus 1, and the washing operation is completed.

  On the other hand, when the cleaning is insufficient (when the voice guidance “please re-clean” is given), the process branches from STEP 12 to STEP 20. Then, the operator drains the hot water supply apparatus 1, and in the subsequent STEP 21, the cleaning liquid 74 in the cleaning liquid tank 73 is replaced or supplemented as necessary, and the process returns to STEP 4, and the heat exchanger 21 is processed by STEP 4 and subsequent processes. Repeat the cleaning procedure.

  Next, the execution procedure of the “heat exchange good determination process” will be described with reference to the flowchart shown in FIG. The heat exchange state determination unit 12 executes “heat exchange good determination processing” in accordance with the above-described operation of the remote controller 50 by the operator.

  The heat exchange state determination unit 12 reads the data of the first threshold temperature Ath held in the memory (not shown) in STEP 30, and in the next STEP 31, “Please open the curan” from the speaker 56 of the remote controller 50. Voice guidance is output. When the operator opens the currant 44 according to the voice guidance, water supply from the water pipe 41 to the water supply pipe 30 is started.

  In subsequent STEP 32, when the detected flow rate of the flowing water sensor 29 becomes equal to or higher than the ignition flow rate, the hot water supply control unit 11 starts the hot water supply operation. In the next STEP 33, the heat exchange state determination unit 12 determines the heat exchange outlet temperature Tout. The hot water supply control unit 11 is caused to execute a hot water supply operation so that the temperature becomes the determination temperature Tj. The start of the hot water supply operation corresponds to the time when the hot water supply operation is started in accordance with the “heat exchange state confirmation instruction” of the present invention.

  Then, when a predetermined time (for example, 10 minutes) has passed in the next STEP 34, the process proceeds to STEP 35, and the heat exchange state determination unit 12 outputs a voice guidance “Please close the curan” from the speaker 56 of the remote controller 50. . When the operator closes the currant 44 according to the voice guidance, the water supply from the water pipe 41 to the water supply pipe 30 is stopped. When the detected flow rate of the flowing water sensor 29 becomes smaller than the ignition flow rate in the subsequent STEP 36 due to the stop of the water supply from the water pipe 41 to the water supply tube 30, the process proceeds to STEP 37, and the hot water supply operation is stopped.

  In subsequent STEP 38, the heat exchange state determination unit 12 detects the heat exchange outlet temperature Tout and measures the post-boiling temperature Tup. In STEP 39, the heat exchange state determination unit 12 compares the post-boiling temperature Tup with the first threshold temperature Ath to determine whether the post-boiling temperature Tup is lower than the first threshold temperature Ath.

  Here, when the post-boiling temperature Tup is lower than the first threshold temperature Ath, it can be determined that the heat exchanger 21 has been cleaned well. For this reason, the process proceeds from STEP 39 to STEP 40, and the heat exchange state determination unit 12 outputs a voice guidance “cleaning is OK” from the speaker 56 of the remote controller 50, proceeds to STEP 41, and ends the process.

  On the other hand, when the post-boiling temperature Tup is equal to or higher than the first threshold temperature Ath, it can be determined that the heat exchanger 21 is not sufficiently cleaned. Therefore, branching from STEP 39 to STEP 50, the heat exchange state determination unit 12 outputs a voice guidance “please re-wash” from the speaker 56 of the remote controller 50, and proceeds to STEP 41 to end the process.

  Next, the determination process of the determination temperature Tj and the first threshold temperature Ath by the heat exchange state determination unit 12 will be described according to the flowchart shown in FIG. When the use of the hot water supply device 1 is started (when the hot water supply device 1 is newly installed in a house, when the hot water supply device 1 is newly installed in the house, the heat exchange state determination unit 12 advances the adhesion of the lime scale in the heat exchanger 21. 6), the process according to the flowchart shown in FIG. 6 is executed to determine the determination temperature Tj and the first threshold temperature Ath.

  The heat exchange state determination unit 12 waits for the hot water supply operation to be started by the hot water supply control unit 11 in STEP 60, and then proceeds to STEP 61. Then, in a loop composed of the next STEP 61 and STEP 70, the process waits for a set time (for example, 10 minutes) to elapse in STEP 61 or for the hot water supply operation to stop in STEP 70.

  When the set time has elapsed in STEP 61 (when it can be determined that the hot water supply operation has continued for the set time and the temperature of the hot water discharged from the heat exchanger 21 has stabilized), the process proceeds to STEP 62 and the heat exchange state determination unit 12 Waits for the hot water supply operation to stop.

  When the hot water supply operation is stopped in STEP 62, the process proceeds to STEP 63, where the heat exchange state determination unit 12 performs heat at the time when the hot water supply operation is stopped (when the water flow in the heat exchanger 21 is stopped and the burner 22 is extinguished). The intersection temperature Tout is determined as the determination temperature Tj and is stored in the memory.

  In subsequent STEP 64, the heat exchange state determination unit 12 detects the degree of increase in the heat exchange outlet temperature Tout from the time when the hot water supply operation is stopped, and measures the post-boiling temperature Tup. Then, a temperature slightly higher than the post-boiling temperature Tup is determined as the first threshold temperature Ath, and data of the first threshold temperature Ath is held in the memory.

  In the present embodiment, the process according to the flowchart shown in FIG. 6 is used to determine the determination temperature Tj and the first temperature based on the measured values of the heat exchange outlet temperature Tout and the post-boiling temperature Tup when the hot water supply operation is actually performed. Although the threshold temperature Ath is determined, the determination temperature Tj and the first threshold temperature Ath may be obtained by experiments or calculations based on design values.

  Moreover, in this embodiment, although the hot water supply apparatus 1 provided with the burner 22 which uses gas as a fuel was shown, also about the hot water supply apparatus provided with the burner which burns other types of fuels, such as a burner which uses oil as a fuel, The present invention can be applied.

  In the present embodiment, in the flowchart shown in FIG. 5, when the post-boiling temperature Tup is equal to or higher than the first threshold temperature Ath, the voice guidance “please re-clean” is output. Even when the output is not performed, the effect of the present invention can be obtained.

  In the present embodiment, in the flowchart shown in FIG. 5, the voice guidance “Please open the curan” is output in STEP 31 and the voice guidance “Please close the curan” is output in STEP 35. The operator urged the operator to open and close the currant 44, but a hot water pipe (not shown) branched from the hot water supply pipe 31 and connected to a bathtub (not shown) and an open / close valve (not shown) for opening and closing the hot water pipe. When the water supply and stop from the water pipe to the water supply pipe 30 can be switched by the control of the open / close valve as in the case where the open / close valve is provided, the open / close valve is not output without outputting these voice guidances. May be switched between the valve open state and the valve closed state to execute the cleaning completion determination process.

  In the present embodiment, the heat exchange outlet temperature sensor 26 is provided on the hot water supply pipe 31 side in the vicinity of the connection place between the heat exchanger 21 and the hot water supply pipe 31, but the connection place between the heat exchanger 21 and the hot water supply pipe 31. You may provide in the near heat exchanger 21 side.

  DESCRIPTION OF SYMBOLS 1 ... Hot water supply apparatus, 2 ... Apparatus main body, 10 ... Controller, 11 ... Hot water supply control part, 12 ... Heat exchange state determination part, 21 ... Heat exchanger, 22 ... Burner, 26 ... Heat exchange outlet temperature sensor, 29 ... Running water sensor , 30 ... Water supply pipe, 31 ... Hot water supply pipe, 40 ... Water supply switching valve, 41 ... Water pipe, 42 ... Hot water supply switching valve, 43 ... Hot water supply pipe, 44 ... Karan, 50 ... Remote control, 56 ... Speaker.

Claims (3)

A heat exchanger connected to the water supply pipe and hot water supply pipe;
A burner for heating the heat exchanger;
A heat exchanger outlet temperature sensor for detecting the temperature of water in the heat exchanger near the connection point between the heat exchanger and the hot water supply pipe or the hot water supply pipe;
A running water sensor for detecting the presence or absence of running water in the heat exchanger;
When flowing water is detected by the flowing water sensor, a hot water supply operation is performed in which the burner is burned to heat the water flowing in the heat exchanger, and when flowing water is not detected by the flowing water sensor, A hot water supply control unit for stopping the hot water supply operation with the burner extinguished,
When the hot water supply operation is started in response to a predetermined heat exchange state confirmation instruction, when the hot water supply operation is stopped, the detected temperature increase of the heat exchange outlet temperature sensor from the time when the hot water supply operation is stopped A post-boiling temperature is measured, and a post-boiling temperature determination process is performed to compare the post-boiling temperature with the first threshold temperature. When the post-boiling temperature is lower than the first threshold temperature, a predetermined heat Good news
When the hot water supply operation is started without depending on the heat exchange state confirmation instruction, the post boiling temperature is measured when the hot water supply operation is stopped, and the post boiling temperature is higher than the first threshold temperature. A heat exchange state determination unit that executes heat exchange blockage determination processing for comparison with the second threshold temperature and performs predetermined heat exchange blockage notification when the post-boiling temperature is higher than the second threshold temperature. Hot water supply device characterized by The hot water supply apparatus according to claim 1,
The heat exchange state determination unit performs the hot water supply operation to the hot water supply control unit so that the detected temperature of the heat exchange outlet temperature sensor becomes a predetermined determination temperature when the heat exchange state confirmation instruction is given. Let
The hot water supply apparatus, wherein the first threshold temperature is set according to the determination temperature. In the hot water supply apparatus according to claim 1 or claim 2,
In the heat exchange good determination process, when the post-boiling temperature is equal to or higher than the first threshold temperature, the heat exchange state determination unit performs notification that prompts cleaning of the heat exchanger. .

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