JPH08178273A - Hot water feeder - Google Patents

Abstract

PURPOSE: To detect the clogging of a feed and exhaust part or the deterioration of a combustion fan by providing a detecting means for detecting the clogging of the feed and exhaust part or the deterioration of the combustion fan when the difference between the variation and the reference value in the rotating speed of the combustion fan exceeds a prescribed value. CONSTITUTION: After prescribed time Δt passes, a CPU 20 computes the variation α1 of the rotating speed of a combustion fan 15 from the start of operation to the lapse of the prescribed time Δt and stores it in a memory 20a. On the other hand, the CPU 20 reads the variation α2 of the rotating speed of the combustion fan 15 from the start of operation during normal operation, which is previously stored at the time of shipment from a factory, to the lapse of the prescribed time Δt from a memory 24 and judges whether the difference between α1 and α2 exceeds a threshold value β1. When the difference between α1 and α2 exceeds β1, the CPU 20 judges that a feed and exhaust part is clogged or the combustion fan is deteriorated, stores the contents of the failure in the memory 24 as failure data and displays a warning on a remote controller 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply system, and more particularly to detection of clogging of a gas supply / exhaust section or deterioration of a combustion fan in a domestic gas water supply system.

[0002]

2. Description of the Related Art Household gas water heaters can be roughly classified into single-function machines dedicated to hot water supply or bath heating, and multi-function machines having both hot water supply and bath reheating functions. Multi-function machines that combine the function of reheating the bath and the bath have become mainstream, and by incorporating a microprocessor, the hot water temperature can be electrically controlled by turning on and off gas combustion and controlling the gas combustion amount and water flow rate. The mainstream is what you do.

For example, as an example of hot water supply temperature control, the amount of water input is monitored by a water amount sensor with respect to the hot water supply temperature set by the user, and the incoming water temperature and the hot water outlet temperature are monitored by a temperature sensor, and C
Control is performed such that the PU automatically controls the water flow rate, the gas flow rate, and the air volume sent by the combustion fan based on the information. Here, the combustion fan is a fan for blowing secondary air into the gas combustion chamber forcibly, and the volume of the combustion chamber can be reduced by promoting the combustion reaction. Recently, it has been widely used for this type of hot water supply device.

On the other hand, although various methods are adopted as the supply and exhaust methods of the hot water supply apparatus, a typical example is shown in FIG. For example, FIG. 6 (a) shows an indoor hot water supply device, in which an air supply / exhaust pipe penetrating a wall in contact with the outside air is connected to an air supply / exhaust port of the hot water supply device to take in air from the outside and exhaust it to the outside. It is the figure which showed the outline of the structure of a type, and FIG.6 (b) is the external view. FIG. 6C also shows an indoor installation type hot water supply device, in which the exhaust port of the hot water supply device is connected to the exhaust pipe that penetrates the wall in contact with the outside air to exhaust the air outdoors, and the indoor is provided by the air supply port provided in the hot water supply device. It is the figure which showed the outline of the structure of the type which takes in air from, and FIG.6 (d) is the external view. FIG. 6 (e) shows an outdoor type hot water supply device, which takes in outside air from an air supply port provided in the hot water supply device,
Similarly, FIG. 6 (f) is an external view showing an outline of a configuration of a type in which air is directly exhausted from an exhaust port provided in the hot water supply device. Hereinafter, the term "supply / exhaust unit" used in the present specification refers to a part provided for supply and exhaust of all types of water heaters, including the case where the supply port and the exhaust port are separately provided. Shall be collectively referred to.

[0005]

By the way, in such an air supply / exhaust section, there are many cases where clogging due to dust or the like progresses while the hot water supply apparatus is continuously used. Also, for example, if you dry the clothes in the exhaust port or place an object in front of the air supply port to block the air supply / exhaust part due to the user's carelessness or at the inlet of the exhaust port connected to the outer wall. In some cases, birds form nests and block them (these cases are collectively referred to as "clogging of the air supply / exhaust section"). When the air supply / exhaust section is clogged, the resistance to the rotation of the combustion fan increases because the air flow is stopped.
For example, even if the CPU calculates the rotation speed of the combustion fan corresponding to the water flow rate and the gas flow rate and issues a command to rotate the combustion fan at such a rotation speed, the combustion fan secures the rotation speed as instructed. become unable. As a result, the efficiency of gas combustion may decrease.

A sensor for detecting the number of rotations of the fan is provided,
If the sensor constantly sends a feedback signal to the CPU, and if the signal from the sensor is an abnormal value that cannot be received, the CPU determines that the relevant part is defective and displays it on the remote control device. There are also models. Therefore, if the combustion fan does not rotate at all even though the CPU issues a command to rotate the combustion fan, the CPU may determine that there is a failure and display such an indication, or stop the operation. The user can notice the malfunction.

However, when the combustion fan cannot secure this rotation speed in response to the command of the required rotation speed, the CPU which receives the actual rotation speed from the rotation speed detection sensor further increases the rotation speed. Even if the rotation of the combustion fan becomes a little worse, such as issuing a command, the operation of the water heater will continue without any problems for the time being.Therefore, until the combustion fan stops operating completely, the user cannot operate under adverse conditions. There is a problem that you do not notice that it is progressing. This problem is not only caused by the clogging of the air supply / exhaust part, but the combustion fan itself deteriorates with age and runs out of oil, causing poor rotation. The same occurs when the rotation speed cannot be secured. This is because in the conventional hot water supply device, the CPU cannot detect the rotation speed of the combustion fan itself, but cannot obtain the information that "the rotation is bad".

The present invention has been made in view of the above problems, and an object thereof is to completely stop the combustion fan when the supply / exhaust portion of the hot water supply device is clogged or the combustion fan itself is deteriorated. By providing a hot water supply device that can detect the rotation failure of the combustion fan, warn the user and enable the repair worker to immediately identify or deal with the defective part before it happens. is there.

[0009]

In order to achieve the above object, in the present invention, attention is paid to the amount of change in the number of revolutions from the start of operation of the combustion fan of the hot water supply device to the reaching of a predetermined number of revolutions. Fan rotation speed detection means for detecting the rotation speed of the combustion fan, first storage means for storing the fan rotation speeds detected by the fan rotation speed detection means in time series, and storage by the first storage means Based on the determined fan rotation speed, the change amount α1 of the fan rotation speed from the start of the operation of the combustion fan to the lapse of a certain time or the time t1 from the start of the operation of the combustion fan to the predetermined fan rotation point is calculated. An arithmetic means, a second storage means for storing the change amount α1 or the time t1 and a third storage means for storing a preset reference value are provided to obtain the change amount α1 or the time t1. With the reference value When the difference exceeds a predetermined value, and to determine the deterioration of clogging or combustion fan supply and exhaust portion.

[0010]

According to the invention described in claims 1 to 9, based on the rotational speed of the combustion fan from the start of operation stored in time series, the fan rotational speed from the start of operation of the combustion fan to the elapse of a certain time The change amount α1 or the time t1 from the start of the operation of the combustion fan to the predetermined fan rotation speed is obtained, and α1
Alternatively, by comparing t1 with a reference value, it is possible to detect early that the rotation of the combustion fan has deteriorated,
As a result, it is possible to determine whether the air supply / exhaust unit is clogged or the combustion fan is deteriorated.

According to the second aspect of the present invention, the change amount α of the fan rotational speed from the start of operation of the combustion fan at the normal time stored in advance as a reference value in advance to the lapse of a predetermined time from the start of operation.
By adopting No. 2, it becomes possible to detect clogging of the air supply / exhaust section or deterioration of the combustion fan from the beginning of installation of the hot water supply apparatus.
The invention according to claim 3 employs, as a reference value, an average value α6 of a change amount of the fan rotation speed from the start of operation of the combustion fan to the lapse of a certain time after the operation is performed a predetermined number of times from the beginning of installation, and the water heater It is possible to make a judgment that reflects the individuality of the installation itself and the installation conditions.

According to the fourth aspect of the present invention, as the reference value, the change amount α4 of the fan rotation speed from the start of the operation of the combustion fan during the previous operation to the elapse of a fixed time is adopted, and the combustion fan It is possible to detect the case where the rotation is drastically reduced.

Further, in the invention described in claim 6, since the failure data is stored in a readable manner, the failure data can be read out at any time to specify the failure part. In the invention described in claim 7 or 8, When it is determined that the air supply / exhaust unit is clogged or the combustion fan is deteriorated, a warning or a display is displayed, so that the user or the repair worker can immediately deal with this.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of an embodiment of a hot water supply apparatus according to the present invention. The hot water supply apparatus 1 has a water pipe 6 for introducing water from the water supply into the hot water supply apparatus 1 and discharging hot water, and a water pipe 6 in the middle thereof. A heat exchanger 16 provided, a burner 17 for heating the heat exchanger 16 by gas combustion, and a gas supply pipe 7 for supplying gas to the burner 17, and an air supply port for taking in air. 26 and an exhaust port 25 for exhausting air.

In the water pipe 6 of the hot water supply device 1, an inlet water temperature sensor 3a for monitoring the inlet water temperature in the pipe and an outlet hot water temperature sensor 3b for monitoring the outlet hot water temperature after heating with a heat exchanger,
Water quantity sensor 2 for monitoring the water quantity, and water quantity control valve 1
0 and are provided.

Further, the gas supply pipe 7 is provided with a source gas solenoid valve 12 and a switching solenoid valve 13a to open and close the supply of gas.
13c and a gas proportional valve 11 for adjusting the amount of gas supplied are provided. Further, the burner 17 is provided with a spark plug 18 and a frame rod 19 for detecting an abnormality of gas combustion, and a combustion fan 15 and a combustion fan 15 for injecting air to accelerate a gas combustion reaction are provided at a lower portion of the burner 17. A rotation speed detection sensor 4 is provided to detect the rotation speed of the fan 15.

The CPU 20 receives a signal indicating the change in the water amount from the water amount sensor 2, controls the opening / closing of the original gas solenoid valve 12 and the switching solenoid valves 13a to 13c via the control device 21, and also controls the water temperature sensor 3a. Hot water temperature sensor 3
In response to the temperature signals indicating the incoming water temperature and the outgoing hot water temperature detected in b, the rotation of the combustion fan 15, the operation of the gas proportional valve 11 and the water amount control valve 10, and the switching electromagnetic so that the outgoing hot water temperature becomes the hot water temperature set by the user. The operation and the like of the valves 13 a to 13 c are controlled via the control device 21. On the other hand, the CPU 20 receives a signal from the rotation speed detection sensor 4 and outputs the detected rotation speed as C
It is stored in the memory 20a in the PU in time series, and the change amount of the rotation speed within a fixed time from the start of operation is calculated based on the rotation speed stored in time series, and is also stored in the memory 20a. An external memory 24 is connected to the CPU 20 and stores basic data, failure data, etc. for detecting rotation failure of the combustion fan. Further, outside the hot water supply device 1, a remote control device 22 with a display unit for the user to set the hot water temperature and the amount of water is provided.
Connected with.

Next, the operation of the water heater 1 will be described. When the faucet 23 is closed, the inside of the water pipe 6 is stationary with the water pressure of the tap water filling the mouth of the faucet 23. Here, when the faucet 23 is opened, the water in the water pipe 6 flows out toward the faucet 23 due to the water pressure, and as a result, the water amount sensor 2 detects the start of flowing water and transmits it to the CPU 20.

C, which receives a running water start signal from the water amount sensor 2
The PU 20 first receives the combustion fan 15 via the control device 21.
To start the rotation. Next, the spark of the ignition plug 18 is started, and the original gas solenoid valve 12 and the switching solenoid valve 13a
Send a signal to open. As a result, when gas is supplied to the burner 17, it is ignited by the ignition plug 18 and gas combustion starts, whereby the heat exchanger 16 is heated and the running water in the water pipe 6 is heated. When further increasing the gas supply amount, the CPU 20 causes the switching solenoid valves 13b and 13
Send a signal to open c.

Here, the combustion fan 15 by the CPU 20
Will be described. Based on the amount of water input detected by the water amount sensor 2, the hot water supply temperature set by the user with the remote control device, the water input temperature detected by the water temperature sensor 3a, the outside air temperature detected by an outside air temperature sensor (not shown), etc. in the CPU 20. The optimum gas supply amount for heating the heat exchanger 16 is calculated, and the amount of air necessary for complete combustion is calculated with the gas supply amount, and the rotation of the combustion fan 15 for securing the air amount. Calculate the number,
The control device 2 controls the combustion fan 15 to rotate at that speed.
A command is given to the combustion fan 15 via 1. On the other hand, the fan rotation speed detection sensor 4 detects the actual rotation speed of the combustion fan 15 and sends it to the CPU 20. Here, a hall element is used as the fan rotation speed detection sensor 4, but another device such as an encoder may be used.

Next, referring to FIG. 2 to FIG. 4 and FIG. 1, of the first to fourth embodiments for detecting clogging of the air supply and exhaust ports 25 and 26 or deterioration of the combustion fan 15 in the CPU 20. The operation will be described.

First Embodiment FIG. 2 is a flow chart of a first embodiment for detecting clogging of the air supply / exhaust section or deterioration of the combustion fan according to the present invention.

When the faucet 23 is opened to start flowing water in the water pipe 6, the water amount sensor 2 transmits the start of flowing water to the CPU 20, and as a result, the combustion fan 15 starts operating, and then gas combustion also starts ( F-1). From the start of the operation of the combustion fan 15, the CPU 20 stores the rotation speed per unit time of the combustion fan 15 from the start of the operation in the memory 20a in the CPU 20 in a time-series manner (F-2) for a predetermined time Δt.
It waits for (for example, 2 seconds) to elapse (F-3).

After the lapse of the predetermined time Δt, the CPU 20 calculates the change amount α1 of the rotation speed of the combustion fan 15 from the start of the operation to the lapse of the predetermined time Δt, and stores it in the memory 20a (F-
4). On the other hand, the CPU 20 reads from the memory 24 the variation amount α2 of the rotation speed of the combustion fan 15 from the start of the normal operation to the predetermined time Δt, which is stored in advance at the time of factory shipment (F-5), and α2. It is determined whether or not the difference between .alpha.1 and .alpha.1 exceeds the threshold value .beta.1 (F-6). If the rotation of the combustion fan 15 is deteriorated due to clogging of the air supply / exhaust ports 25 and 26 and deterioration of the combustion fan 15, α2
And the difference between α1 and α1 gradually increases. β1 is the combustion fan 1
5 is a predetermined threshold value for giving a display or warning before the rotation of 5 worsens.

If the difference between α2 and α1 does not exceed β1, it can be determined that the combustion fan 15 is within the normal operation range, so the rotation speed data is cleared (F-7) and the next operation is performed. Prepare for calculation. On the other hand, the difference between α2 and α1 is β
If it exceeds 1, it is determined that the air supply / exhaust section is clogged or the combustion fan is deteriorated (F-8), and the determined failure content is stored as failure data in the memory 24 (F-9), and the remote control is performed. Display a warning on the device 22 (F-1
0). A method of calling the user's attention by lighting a lamp may be used. If the remote control device 22 displays, for example, "Please check if the air supply / exhaust port is not blocked", it is convenient because the user can take measures for the time being. Further, when a repair worker visits for repair, a portable terminal device with a display unit or the like is connected to the CPU 20 and the memory 2
By reading the failure data stored in 4, it is possible to quickly deal with the problem.

To find the difference between α1 and α2, α
It is necessary that the operating environment (set temperature of the user, outside air temperature, incoming water temperature, amount of incoming water, etc.) of the water heater 1 in 1 and α2 is the same. Therefore, the memory 24 has a table of data of α2 corresponding to the driving environment which can be predicted in advance, and
An appropriate value of α2 may be read from the environment of 1. In addition, the memory 2 stores an arithmetic expression for obtaining α2 in normal operation from the user's set temperature, outside air temperature, incoming water temperature, incoming water amount, etc.
4 in advance, and α1 is set to the step (F-
After the calculation in 4), α2 may be obtained from the calculation formula stored in the memory 24 in step (F-5).

Second Embodiment Next, a second embodiment will be described with reference to FIG. Second
Since the control flow of this embodiment is exactly the same as that of the first embodiment shown in FIG. 2, common steps (Q-1) to (Q-4) and (Q-8) to (Q- The description up to 10) is omitted. In the second embodiment, instead of the change amount α2 of the rotation speed of the combustion fan 15 in the normal operation used in the first embodiment as the reference value for the determination of the clogging of the air supply / exhaust section or the deterioration of the combustion fan, After the factory shipment, the hot water supply device is installed and operated a predetermined number of times (for example, 5 times) from the first operation, and the change amount of the fan rotation speed of the combustion fan 15 at that time is averaged and stored in the memory 24 as a change amount α6. It is stored and α6 is read in step (Q-5), and it is determined in step (Q-6) whether the difference between α6 and α1 exceeds the threshold β2.

When α6 is used as the reference value for the determination as described above, compared with the case where the reference value is uniformly set in advance at the stage of factory shipment (that is, the first embodiment), each combustion fan unit is individual. Since individual differences and installation conditions of the water heater can be reflected in the reference value, it is possible to make a more detailed determination according to the individuality of each water heater itself and the installation conditions.

Third Embodiment Next, a third embodiment relating to detection of deterioration of the air supply / exhaust port and the combustion fan according to the present invention will be described with reference to FIG.
Also in FIG. 4, the basic control flow, that is, steps (S-1) to (S-4) and (S-8) to (S).
Since the steps up to -10) are the same as those in FIG. 2, the description thereof will be omitted, and the description will focus on the points different from the control in FIG.

In this embodiment, the amount of change α4 during the previous operation is stored in the memory 24 in advance, and the step (S
-4) calculates α1 and then reads this α4 (S-
5) In step (S-6), it is determined whether the difference between α4 and α1 exceeds the threshold β3. β3 is the combustion fan 15
Is a predetermined threshold value for displaying or issuing a warning when the rotation speed of the engine has deteriorated by a certain value or more compared to the previous operation. That is, it is determined that the supply / exhaust portion is clogged or the combustion fan is deteriorated when the rise of the rotation speed of the combustion fan 15 is drastically decreased as compared with the previous operation (S-8). This is useful for detecting when the air supply / exhaust part is blocked by hanging the cloth or placing something on it carelessly by the user. If the difference between α4 and α1 does not exceed β3, it is possible to determine that the combustion fan 15 is in the normal operation range. Therefore, the current value of α1 is set as the value of α4 and the data in the memory 24 is rewritten (S-7). Prepare for the next operation.

Fourth Embodiment Finally, a fourth embodiment will be described with reference to FIG. Also in FIG. 5, the basic control flow is the same as that in FIG. 2, so that the point different from the control in FIG.
3) to (P-7) will be described.

In the fourth embodiment, the fan rotation speed is stored in the memory 20a in time series from the start of the operation of the combustion fan 15 (P-2), and the rotation speed per unit time is a predetermined rotation speed (eg, Wait until it reaches 700 rpm (P-
3). When the predetermined number of rotations is reached, the time t1 from the start of operation to the time point is obtained (P-4). t1 becomes longer as the supply and exhaust ports are clogged or the combustion fan is deteriorated. Therefore, the time value t2 stored in advance in the memory 24 is read (P-5), and when t1 exceeds t2 (P-6), it is determined that the air supply / exhaust unit is clogged or the combustion fan 15 is deteriorated. (P-8). The time value t2 is a predetermined threshold value for displaying or warning if it takes more time than the combustion fan 15 reaches the predetermined number of revolutions from the start of operation.

As described above, in this embodiment, the means for judging the clogging of the air supply / exhaust portion or the deterioration of the combustion fan is provided inside the hot water supply apparatus. However, the side of the portable terminal apparatus having a built-in CPU carried by the repair worker is provided. When the repair / inspection work is performed by providing such a determination means to the CPU, the CPU in the water heater 1
This terminal device may be connected to 20 to make a failure determination.

The hot water supply apparatus 1 of FIG. 1 is a single-function machine dedicated to hot water supply, but even a multi-function machine having a bath reheating function can be used for hot water supply if it has a combustion fan. Since gas combustion has a similar mechanism, the present invention can be implemented.

[0036]

As described above, in the present invention, paying attention to the change in the number of revolutions from the start of the operation of the combustion fan of the hot water supply device until reaching the predetermined number of revolutions, the number of revolutions of the combustion fan is The fan rotation speed detection means for detecting, the first storage means for storing the fan rotation speed detected by the fan rotation speed detection means in time series, and the fan rotation speed stored in the first storage means. Based on the change amount α1 of the fan rotation speed from the start of the operation of the combustion fan to the lapse of a certain time based on the time, or the time t1 from the start of the operation of the combustion fan to the predetermined fan rotation point, and the change. A second storage means for storing the amount α1 or the time t1 and a third storage means for storing a preset reference value are provided, and a difference between the change amount α1 or the time t1 and the reference value is provided. Exceeds the specified value When the combustion fan fails to rotate due to clogging of the air supply / exhaust port or deterioration of the combustion fan itself, the combustion fan is judged to be clogged at the air supply / exhaust part or deterioration of the combustion fan. It is possible to detect the rotation failure of the combustion fan early before the engine is completely stopped, to warn the user and enable the repair worker to immediately identify the defective portion or deal with it.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a hot water supply device according to the present invention.

FIG. 2 is a flowchart showing the operation of the first embodiment according to the present invention.

FIG. 3 is a flowchart showing the operation of the second exemplary embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the third exemplary embodiment of the present invention.

FIG. 5 is a flowchart showing the operation of the fourth embodiment according to the present invention.

6 (a) to 6 (d) are diagrams showing a supply / exhaust system of a conventional water heater.

[Explanation of symbols]

 1 Hot Water Supply Device 2 Water Volume Sensor 3a, 3b Temperature Sensor 4 Rotation Speed Detection Sensor 6 Water Pipe 7 Gas Supply Pipe 16 Heat Exchanger 17 Burner 20 CPU 21 Control Device 22 Remote Control Device 23 Faucet 24 Memory 25 Exhaust Port 26 Air Supply Port

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[Procedure amendment]

[Submission date] April 12, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

6 (a) to 6 (f) are diagrams showing a supply / exhaust system of a conventional water heater.

Claims (9)

[Claims] 1. A water pipe for introducing water from water supply to heat the water to supply hot water, and a heat exchanger provided in the middle of the water pipe.
A burner for heating the heat exchanger, a gas supply pipe for supplying gas to the burner, a combustion fan for feeding air to promote a gas combustion reaction, and an air supply / exhaust unit for air supply and exhaust. A hot water supply device having: a fan rotation speed detection means for detecting the rotation speed of the combustion fan; and a first storage means for storing the fan rotation speed detected by the fan rotation speed detection means in time series, Calculating means for calculating a change amount α1 of the fan rotation speed from the start of operation of the combustion fan to the lapse of a certain time based on the fan rotation speed stored in the first storage means; and a storage means for storing the change amount α1. 2 storage means, 3rd storage means for storing a preset reference value, and when the difference between the variation α1 and the reference value exceeds a predetermined value,
A hot water supply apparatus comprising: a determination unit that determines whether the air supply / exhaust unit is clogged or the combustion fan is deteriorated. 2. The amount of change α2 in fan speed from the start of operation of the combustion fan when the reference value is normal to the elapse of a certain time.
The hot water supply apparatus according to claim 1, wherein when the difference between the change amount α1 and the change amount α2 exceeds a predetermined value, the determination unit determines that the air supply / exhaust unit is clogged or the combustion fan is deteriorated. 3. The reference value is an average value α6 of the amount of change in the fan rotation speed from the start of the operation of the combustion fan to the lapse of a certain time when the hot water supply device is operated a predetermined number of times after the hot water supply device is installed. The water heater according to claim 1, wherein when the difference between the change amount α1 and the change amount α6 exceeds a predetermined value, it is determined that the air supply / exhaust portion is clogged or the combustion fan is deteriorated. 4. The reference value is a change amount α4 of the fan rotation speed from the start of the operation of the combustion fan during the previous operation to the elapse of a fixed time, and the determination means is a difference between the change amount α1 and the change amount α4. The hot water supply apparatus according to claim 1, wherein when the value exceeds a predetermined value, it is determined that the air supply / exhaust section is clogged or the combustion fan is deteriorated. 5. A water pipe for introducing water from water supply to heat the water to supply hot water, and a heat exchanger provided in the middle of the water pipe.
A burner for heating the heat exchanger, a gas supply pipe for supplying gas to the burner, a combustion fan for feeding air to promote a gas combustion reaction, and an air supply / exhaust port for air supply and exhaust. A hot water supply device having: a fan rotation speed detection means for detecting the rotation speed of the combustion fan; and a first storage means for storing the fan rotation speed detected by the fan rotation speed detection means in time series, Calculation means for obtaining a time t1 from the start of operation of the combustion fan to a predetermined fan rotation speed based on the fan rotation speed stored in the first storage means, and a second storage for storing the time t1. Means, third storage means for storing a preset reference time t2, and determining means for determining that the supply / exhaust section is clogged or the combustion fan is deteriorated when the time t1 exceeds the reference time t2. Water heater characterized in that it comprises. 6. The method according to claim 1, further comprising a fourth storage unit that readably stores the failure data when the determination unit determines that the air supply / exhaust unit is clogged or the combustion fan is deteriorated. The water heater according to item 1. 7. The hot water supply apparatus according to claim 1, further comprising warning means for warning a user when it is determined that the air supply / exhaust portion is clogged or the combustion fan is deteriorated. 8. The hot water supply according to claim 1, further comprising display means for displaying the failure data to a user when it is determined that the air supply / exhaust portion is clogged or the combustion fan is deteriorated. apparatus. 9. A water pipe for introducing water from water supply to heat the water to supply hot water, and a heat exchanger provided in the middle of the water pipe.
A burner for heating the heat exchanger, a gas supply pipe for supplying gas to the burner, a combustion fan for feeding air to promote a gas combustion reaction, and an air supply / exhaust unit for air supply and exhaust. In a method of detecting clogging of an air supply / exhaust section or deterioration of a combustion fan in a hot water supply apparatus including, the rotation speed of the combustion fan is detected, and the detected fan rotation speed is stored in time series and stored. Based on the fan rotation speed, the change amount of the fan rotation speed from the start of operation of the combustion fan to the passage of a certain time or the time from the start of operation of the combustion fan to a predetermined fan rotation speed is calculated, and the change amount or When the difference between the time and a preset reference value exceeds a predetermined value, it is determined that the air supply / exhaust unit is clogged or the combustion fan is deteriorated. A method to detect clogging of the engine or deterioration of the combustion fan.