TWI709720B - System and method for adjusting heating capacity of water heater - Google Patents

Abstract

The present invention provides a system and a method for adjusting heating capacity of water heater. The system includes a heater, a water inlet temperature sensor, a water outlet temperature sensor, a water flow sensor, a flame current detector, a gas valve, and a controller. The controller can dynamically adjust minimal heating capacity of the water heater temporarily when the controller determines that the water outlet temperature does not reach the minimal predetermined temperature, and when the controller determines that there is no misfire, the adjusted heating capacity is configured as a new heating capacity of the water heater.

Description

System and method for adjusting minimum heating capacity of water heater

The invention relates to a modulation system and method, in particular to a water heater minimum heating capacity modulation system and method.

With the progress of the times, water heaters have become an indispensable device for general home life. According to the energy used by water heaters, they can be roughly divided into gas water heaters, electric water heaters and solar water heaters. Among them, gas water heaters are the most commonly used. Existing gas water heaters usually include a burner and a heat exchanger. The burner can be used to heat the heat exchanger so that cold water can enter the heat exchanger for heat exchange, and then discharge hot water for use.

However, the existing gas water heater has the problem of minimum heating capacity (minimum number). For example, the minimum heating capacity of a 16L (number) water heater is No. 3 (75kcal/min). Therefore, when users use the water heater in summer, the inlet water temperature is relatively high. If the minimum heating capacity of a 16L (size) water heater is forced to be set to No. 2, the water heater will turn off and cause condensation and dripping.

The current solution to the existing water heater is to install a water volume pressurization controller and a pressurization pump on the water heater, and use the water volume pressurization controller to control the pressurization pump to increase the water volume to reduce the hot water outlet temperature. However, This method will greatly increase the cost of the water heater and increase water consumption.

In summary, the inventor feels that the above-mentioned shortcomings can be improved, and with great concentration of research and the application of scientific theory, finally proposed an invention that is reasonably designed and effectively improves the above-mentioned shortcomings.

The purpose of the present invention is to provide a system and method for adjusting the minimum heating capacity of a water heater in view of the shortcomings of the prior art.

One of the technical solutions adopted by the present invention is to provide a water heater minimum heating capacity adjustment system, including: a water heater host connected to a cold water pipeline and a hot water pipeline, and the water heater host has a burner in it ; An inlet water temperature detection unit, the inlet water temperature detection unit is installed on the cold water pipeline; an outlet water temperature detection unit, the outlet water temperature detection unit is installed on the hot water pipeline; a flame current detection unit, Set in the main body of the water heater and adjacent to the burner; a gas valve connected to the burner through a gas pipeline; and a fine-tuning control unit electrically connected to the main body of the water heater and the water inlet temperature detecting unit , The outlet water temperature detection unit, the flame current detection and the gas valve, the fine adjustment control unit stores a water heater output curve, the water heater output curve corresponds to different numbers according to the maximum number to the minimum number of the water heater host The gas valve opening relationship curve, and the fine-tuning control unit is used to perform the following steps: according to the outlet water temperature value fed back by the outlet water temperature detecting unit, determine whether the outlet water temperature value reaches a minimum predetermined temperature value of the water heater host; It is judged that the outlet water temperature value has not reached the minimum predetermined temperature value, and the minimum number dynamic fine-tuning procedure is carried out to temporarily and dynamically fine-tune the minimum number of the water heater host and the corresponding gas valve opening according to the water heater output curve. , Carry out the flame current determination program to determine whether there is an abnormality according to the flame current value fed back by the flame current detection unit; if it is determined that there is no abnormality, set the minimum number of the water heater main body after fine-tuning to the new minimum number of the water heater main body number.

In a preferred embodiment, the fine-tuning control unit is further used to perform the following steps when performing the minimum number dynamic fine-tuning procedure: according to the flame current value fed back by the flame current detection unit, determine whether there is a flameout abnormality; if it is determined that there is a flameout If abnormal, temporarily dynamically increase the minimum number of the water heater host and the corresponding gas valve opening; if it is determined that there is no abnormal flameout, temporarily dynamically decrease the minimum number of the water heater host and the corresponding gas valve Opening.

In a preferred embodiment, when the fine-tuning control unit performs the flame current determination program It is further used to perform the following steps: judge whether there is an abnormality of flameout according to the flame current value fed back by the flame current detection unit; if it is determined that there is an abnormality of flameout, adjust the reference value of the flame current judgment; if it is determined that there is no abnormality of flameout, Then judge the flame current value.

In a preferred embodiment, the fine-tuning control unit is further used to perform the following steps when determining the flame current value: judging whether the flame current value fed back by the flame current detection unit is greater than or equal to a predetermined value of the flame current determination reference value Percentage; if it is judged that it is greater than or equal to the predetermined percentage of the flame current judgment reference value, it is judged that the flame current value is not abnormal; if it is judged that it is not greater than or equal to the predetermined percentage of the flame current judgment reference value, the flame current value is judged There is an exception.

In a preferred embodiment, the fine-tuning control unit is further configured to perform the following steps after setting the minimum number of the main body of the water heater after fine-tuning to the new minimum number of the main body of the water heater: according to the flame current detection unit feedback flame Current value, judge whether there is a flameout abnormality; if it is judged that there is a flameout abnormality, perform the minimum number dynamic fine-tuning procedure; if it is judged that there is no flameout abnormality, and judge the outlet water temperature according to the outlet water temperature value fed back by the outlet water temperature detection unit If the value does not reach the minimum predetermined temperature value, then the minimum number dynamic fine-tuning procedure is performed.

Another technical solution adopted by the present invention is to provide a water heater minimum heating capacity modulation system method, which is suitable for a water heater minimum heating capacity modulation system. The water heater minimum heating capacity modulation system includes: a water heater host, the water heater host Connected to a cold water pipeline and a hot water pipeline, the main body of the water heater has a burner; an inlet water temperature detection unit installed on the cold water pipeline; an outlet water temperature detection unit, the An outlet water temperature detection unit is installed on the hot water pipeline; a flame current detection unit is installed in the main body of the water heater and adjacent to the burner; a gas valve connected to the burner through the gas pipeline; and a fine adjustment A control unit, the fine-tuning control unit is electrically connected to the main body of the water heater, the inlet water temperature detection unit, the outlet water temperature detection unit, the flame current detection and the gas valve, and the fine-tuning control unit stores a water heater output curve The water heater output curve corresponds to the relationship curve of different gas valve openings according to the maximum number to the minimum number of the water heater host. The method of adjusting the minimum heating capacity of the water heater includes: using the fine-tuning control unit according to The outlet water temperature value fed back by the outlet water temperature detection unit determines whether the outlet water temperature value reaches a minimum predetermined temperature value of the water heater host; if it is judged that the outlet water temperature value does not reach the minimum predetermined temperature value, a minimum number of dynamic fine-tuning is performed The program is to temporarily and dynamically fine-tune the minimum number of the water heater host and the corresponding gas valve opening according to the water heater output curve, and then perform the flame current determination program to determine the flame current value fed back by the flame current detection unit Determine whether there is an abnormality; if it is determined that there is no abnormality, set the minimum number of the water heater host after fine-tuning to the new minimum number of the water heater host.

The beneficial effect of the present invention is at least that the system and method for adjusting the minimum heating capacity of the water heater stores a water heater output curve through the fine adjustment control unit, and the water heater output curve corresponds to different gas according to the maximum number to the minimum number of the water heater host The relationship curve of the valve opening degree, and the fine-tuning control unit is used to perform the minimum number dynamic fine-tuning program when it is judged that the water temperature value has not reached the lowest predetermined temperature value of the water heater host, so as to dynamically fine-tune the minimum number of the water heater host and Corresponding to the opening degree of the gas valve, and when it is judged that there is no abnormal flameout, set the minimum number of the water heater main unit to the new minimum number of the water heater main unit, which can effectively avoid the original minimum number of the water heater (minimum heating capacity) In the summer, it can be concluded that the water temperature is too high and consumers complain.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings about the present invention. However, the provided drawings are only for reference and description, and are not used to limit the present invention.

1: Water heater host

11: Burner

12: Heat exchanger

2: Inlet water temperature detection unit

3: Outlet temperature detection unit

4: Flame current detection unit

5: Gas valve

51: Gas pipeline

6: Fine-tuning the control unit

7: Cold water pipeline

8: Hot water pipeline

P: Water heater output curve

S101~S111: steps

S301~S303: steps

S501~S503: steps

Fig. 1 schematically illustrates the minimum heating capacity adjustment system of the water heater of the present invention.

Figure 2 schematically illustrates the relationship between the number of the water heater of the present invention and the opening of the gas valve The curve.

Figure 3 schematically illustrates the relationship curve between the number of water heaters of the present invention and the opening of the gas valve when the number is reduced.

Fig. 4 schematically illustrates the step flow of the method for adjusting the minimum heating capacity of the water heater of the present invention.

Fig. 5 schematically illustrates the step flow of the minimum number dynamic fine-tuning program of the present invention.

Fig. 6 schematically illustrates the step flow of the flame current determination program of the present invention.

The following are specific examples to illustrate the disclosed embodiments of the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are merely schematic illustrations, and are not drawn according to actual dimensions, and are stated in advance. The following embodiments will further describe the related technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention.

The embodiment of the present invention provides a system for adjusting the minimum heating capacity of a water heater, which can be used to dynamically fine-tune the minimum number of the water heater (meaning the minimum heating capacity of the water heater) to reduce the temperature rise of the outlet water.

Please refer to Figure 1, the water heater minimum heating capacity modulation system provided by the embodiment of the present invention includes a water heater main body 1, an inlet water temperature detection unit 2, an outlet water temperature detection unit 3, a flame current detection unit 4, a gas valve 5. And the fine-tuning control unit 6.

The water heater main body 1 can be a gas water heater, which can include a burner 11 inside, and of course, it can also include other elements such as a heat exchanger 12. The burner 11 can be used to heat the heat exchanger 12 so that cold water can enter the heat. The exchanger 12 performs heat exchange and then discharges hot water for use. heat The water heater main body 1 is connected to the cold water pipe 7 and the hot water pipe 8. The cold water pipe 7 is provided with an incoming water temperature sensing element and is connected to an appropriate water source to input cold water to the water heater main body 1. The hot water pipeline 8 is provided with an outlet temperature sensing element and can be used to output the heated hot water for use by the user. The water heater main body 1 belongs to the prior art, and the present invention does not limit the type and structure of the water heater main body 1, so it will not be repeated.

The inlet water temperature detection unit 2 is preferably provided with one end of the cold water pipe 7 and is electrically connected to the fine-tuning control unit 6 by wireless or wired transmission. The inlet water temperature detection unit 2 can be used to detect the inlet water temperature (for example, Cold water temperature).

The outlet water temperature detecting unit 3 is preferably provided with one end of the hot water pipe 8 and electrically connected to the fine-tuning control unit 6 by wireless or wired transmission. The outlet water temperature detecting unit 3 can be used to detect the outlet water temperature (for example, Hot water temperature).

The flame current detection unit 4 is preferably arranged in the water heater main body 1 and adjacent to the burner 11, and is electrically connected to the fine adjustment control unit 6 by wireless or wired transmission. The flame current detection unit 4 can be used to detect the water heater main body 1 (burning 11) flame and corresponding to the output flame current value. In practice, the flame current detection unit 4 may include or be a flame detection needle or a flame detector to detect the current generated by the air ionization phenomenon when the flame is burning.

The gas valve 5 is connected to the burner 11 of the water heater main body 1 through a gas line 51, and the gas valve 5 can be used to adjust the amount of gas to the water heater main body 1.

The fine-tuning control unit 6 can be installed on the body of the water heater main body 1, or on the remote controller of the water heater main body 1 or other remote controllers, or can be electrically connected to the water heater main body 1 by wired or wireless means.

In addition, the fine-tuning control unit 6 stores a water heater output curve P (as shown in FIG. 2). The water heater output curve P is a relationship curve corresponding to different gas valve openings according to the maximum number to the minimum number of the water heater host 1 , Can also be said to be based on the maximum heating of the water heater host 1 The capacity to the minimum heating capacity corresponds to the relationship curve of different gas valve openings. In this embodiment, the water heater host 1 is, for example, a 16L (number) water heater host, its maximum heating capacity (maximum number) is 16 (400kcal/min), and its minimum heating capacity (minimum number) is 3 ( 75kcal/min).

When the water heater main body 1 is in use, the fine-tuning control unit 6 judges whether the outlet water temperature value reaches a minimum predetermined temperature value of the water heater main body 1 according to the outlet water temperature value fed back by the outlet water temperature detecting unit 3, regardless of the inlet water temperature value. The minimum predetermined temperature is the lowest safe water temperature value that can be reached according to the number (heating capacity) of the water heater main unit 1. It is set between 37.5 degrees and 39 degrees. Below this temperature, the water heater main unit 1 will turn off and cause condensation and dripping. Therefore, if it is judged that the water temperature value has reached the lowest predetermined temperature value of the water heater main unit 1, the function of the minimum number dynamic fine-tuning program will not be performed to avoid the water heater main unit 1 from flameout and condensation. If it is judged that the water temperature value has not reached the water heater main unit If the minimum predetermined temperature value is 1, the minimum number dynamic fine-tuning program can be performed to temporarily dynamically fine-tune the minimum number of the water heater host 1 and the corresponding gas valve opening according to the water heater output curve P, as shown in Figure 3, for example The initial minimum number of the water heater main unit 1 (for example, No. 3) is dynamically adjusted to the new minimum number (for example, No. 2). Furthermore, when the fine-tuning control unit 6 performs the minimum number dynamic fine-tuning procedure, the fine-tuning control unit 6 will judge whether there is an abnormality of flameout according to the flame current value fed back by the flame current detection unit 4, and if it is determined that there is an abnormality of flameout, then It will temporarily dynamically increase the minimum number of water heater host 1 and the corresponding gas valve opening. If it is judged that there is no abnormal flameout, it will temporarily dynamically decrease the minimum number of water heater host 1 and the corresponding gas valve opening degree.

After the fine-tuning control unit 6 dynamically fine-tunes the minimum number of the water heater main unit 1, it then performs a flame current determination program to determine whether there is an abnormality based on the flame current value fed back by the flame current detection unit 4, and if it is determined to be abnormal, then Carry out the minimum number dynamic fine-tuning procedure. On the contrary, if it is determined that there is no abnormality, the minimum number (for example, No. 2) after fine-tuning of the water heater main body 1 is set as the new minimum number of the water heater main body 1. After the water heater main unit 1 operates according to the new minimum number, the fine-tuning control unit 6 will then judge whether there is a flame out error according to the flame current value fed back by the flame current detection unit 4 Normally, if there is an abnormal flameout, then perform the minimum number of dynamic fine-tuning procedures. On the contrary, if there is no abnormal flameout, and it is judged that the water temperature has not reached the minimum preset temperature of the water heater host 1, it means that there is still room for fine-tuning. Then carry out the smallest number dynamic fine-tuning program.

Furthermore, when the fine-tuning control unit 6 performs the flame current determination program, it determines whether there is an abnormality of flameout based on the flame current value fed back by the flame current detection unit 4, and if there is an abnormality of flameout, adjusts the flame current determination reference value. Raise the flame current to determine the reference value. On the contrary, if there is no flameout abnormality, the flame current value is determined.

Furthermore, the fine-tuning control unit 6 determines whether the flame current value fed back by the flame current detection unit 4 is greater than or equal to a predetermined percentage of the flame current determination reference value, such as 95%, so if it is determined to be greater than If it is equal to the predetermined percentage of the flame current judgment reference value, it is judged that the flame current value is not abnormal. On the contrary, if it is judged that the flame current value is not greater than or equal to the predetermined percentage of the flame current judgment reference value, it is judged that the flame current value is abnormal, and the minimum number dynamics are required. Fine-tune the program.

Please refer to Figure 4, and please refer to Figure 1 to Figure 3. The embodiment of the present invention provides a method for adjusting the minimum heating capacity of a water heater, which is suitable for a water heater minimum heating capacity adjustment system. The system for adjusting the minimum heating capacity of the water heater may include a water heater main unit 1, an inlet water temperature detection unit 2, an outlet water temperature detection unit 3, a flame current detection unit 4, a gas valve 5, and a fine adjustment control unit 6. The main water heater 1 is connected to the cold water pipe 7 and the hot water pipe 8, and the main water heater 1 has a burner 11. The inlet water temperature detection unit 2 is installed on the cold water pipeline 7. The outlet water temperature detecting unit 3 is installed on the hot water pipeline 8. The flame current detection unit 4 is arranged in the water heater main body 1 and adjacent to the burner 11. The gas valve 5 is connected to the burner 11 through a gas line 51. The fine adjustment control unit 6 is electrically connected to the water heater main body 1, the inlet water temperature detecting unit 2, the outlet water temperature detecting unit 3, the flame current detecting unit 4, and the gas valve 5. The fine-tuning control unit 6 stores a water heater output curve P. The water heater output curve P is a relationship curve corresponding to different gas valve openings according to the maximum number to the minimum number of the water heater host 1.

Step S101: First, make the water heater main body 1 in use. In practice, when the user turns on the faucet or shower head, the water heater main unit 1 is activated.

Step S103: Determine whether the water temperature reaches the minimum predetermined temperature. In detail, the fine adjustment control unit 6 is used to determine whether the water temperature value reaches the lowest predetermined temperature value according to the water temperature value fed back by the water temperature detection unit 3. If it is judged that the water temperature value reaches the lowest predetermined temperature value, the main engine 1 of the water heater will be maintained in normal use, and the minimum number dynamic fine-tuning procedure will not be carried out. On the contrary, if the water temperature value is judged to have not reached the lowest predetermined temperature value, the minimum number dynamic fine-tuning will be performed program.

Step S105: Perform a dynamic fine-tuning procedure for the minimum number. In detail, the fine adjustment control unit 6 is used to temporarily and dynamically fine-tune the minimum number of the water heater main body 1 and the corresponding gas valve opening according to the water heater output curve P.

Step S107: Perform a flame current determination procedure. In detail, the dynamic fine-tuning control unit 6 is used to determine whether there is an abnormality based on the flame current value fed back by the flame current detecting unit 4, if it is determined that there is an abnormality, skip back to step S105, and then perform the minimum number dynamic fine-tuning procedure, otherwise, If it is determined that there is no abnormality, step S109 is performed.

Step S109: Set a new minimum number. Specifically, the fine-tuning control unit 6 is used to set the minimum number of the water heater main body 1 after fine-tuning to the new minimum number of the water heater main body 1.

Step S111: Determine whether there is an abnormal flameout. In detail, after the water heater main unit 1 operates according to the new minimum number, the risk of flameout is not ruled out. Therefore, the fine-tuning control unit 6 will determine whether there is a flameout abnormality according to the flame current value fed back by the flame current detection unit 4. If there is a flameout abnormality, then perform the minimum number dynamic fine-tuning procedure. On the contrary, if there is no flameout abnormality, and it is judged that the water temperature has not reached the lowest predetermined temperature value, it means that there is still room for fine-tuning, and then the minimum number dynamic fine-tuning can be performed program.

Please refer to Figure 5 again. The above-mentioned minimum number dynamic fine-tuning program (S105) may further include the following steps:

Step S301: Determine whether there is an abnormal flameout. First, the fine-tuning control unit 6 is used to determine whether there is an abnormality of flameout according to the flame current value fed back by the flame current detecting unit 4, if there is an abnormality of flameout, go to step S302, if there is no abnormality of flameout, go to step S303.

Step S302: The minimum number is dynamically increased. The fine-tuning control unit 6 is used to temporarily and dynamically increase the minimum number of the water heater host 1 and the corresponding gas valve opening.

Step S303: The minimum number is dynamically reduced. The fine adjustment control unit 6 is used to temporarily and dynamically adjust the minimum number of the water heater main body 1 and the corresponding gas valve opening.

Please refer to Fig. 6 again, the above-mentioned flame current determination procedure (S107) may further include the following steps:

Step 501: Determine whether there is an abnormal flameout. First, the fine-tuning control unit 6 is used to determine whether there is an abnormality in flameout according to the flame current value fed back by the flame current detection unit 4, if there is an abnormality in flameout, go to step S502, and if there is no abnormality in flameout, go to step S503.

Step S502: Adjust the flame current determination reference value.

Step S503: Determine the flame current value.

[Effects of Examples]

In summary, the system and method for adjusting the minimum heating capacity of the water heater provided by the embodiment of the present invention stores a water heater output curve through the fine-tuning control unit, and the water heater output curve is based on the maximum number to the minimum number of the water heater host Corresponding to the relationship curves of different gas valve openings, and the fine-tuning control unit is used to perform the minimum number dynamic fine-tuning program when it is judged that the water temperature value has not reached the lowest predetermined temperature value of the water heater host, so as to dynamically fine-tune the water heater host temporarily The minimum number of the water heater and the corresponding gas valve opening, and when it is judged that there is no abnormal flameout, the minimum number of the water heater main unit is set to the new minimum number of the water heater main unit, which can effectively avoid the original minimum number of the water heater (Minimum heating capacity) In summer, it can be concluded that the water temperature is too high, causing consumers to complain.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of patent protection of the present invention. Therefore, all equivalent changes made by using the description and schematic contents of the present invention are included in the protection of the rights of the present invention. Within the scope, together to Chen Ming.

1: Water heater host

11: Burner

12: Heat exchanger

2: Inlet water temperature detection unit

3: Outlet temperature detection unit

4: Flame current detection unit

5: Gas valve

51: Gas pipeline

6: Fine-tuning the control unit

7: Cold water pipeline

8: Hot water pipeline

Claims (10)

A water heater minimum heating capacity modulation system, including: A water heater main body connected to a cold water pipeline and a hot water pipeline, the water heater main body has a burner; an inlet water temperature detection unit, the inlet water temperature detection unit is installed on the cold water pipeline; The outlet water temperature detection unit is installed on the hot water pipeline; a flame current detection unit is installed in the main body of the water heater and is adjacent to the burner; a gas valve, which is connected through the gas pipeline The burner; and a fine-tuning control unit, the fine-tuning control unit is electrically connected to the water heater host, the inlet water temperature detection unit, the outlet water temperature detection unit, the flame current detection and the gas valve, the fine adjustment control unit stores There is a water heater output curve, the water heater output curve corresponds to the relationship curve of different gas valve openings according to the maximum number to the minimum number of the water heater host, and the fine-tuning control unit is used to perform the following steps: According to the outlet water temperature value fed back by the outlet water temperature detecting unit, it is judged whether the outlet water temperature value reaches a minimum predetermined temperature value of the main body of the water heater; If it is judged that the outlet water temperature value has not reached the minimum predetermined temperature value, perform the minimum number dynamic fine-tuning program to temporarily dynamically fine-tune the minimum number of the water heater host and the corresponding gas valve opening according to the water heater output curve. If it is determined that there is no abnormality, the minimum number of the water heater main unit after fine-tuning is set as the new minimum number of the water heater main unit, according to the flame current value fed back by the flame current detection unit. number. For example, the minimum heating capacity adjustment system of a water heater as described in item 1 of the scope of patent application, wherein the fine-tuning control unit is used to perform the following steps when performing a minimum number dynamic fine-tuning program: According to the flame current value fed back by the flame current detection unit, determine whether there is an abnormal flameout; if it is determined that there is an abnormal flameout, temporarily and dynamically increase the minimum number of the water heater host and the corresponding gas valve opening; if judged If there is no flameout abnormality, temporarily and dynamically reduce the minimum number of the water heater host and the corresponding gas valve opening. For the water heater minimum heating capacity adjustment system described in item 1 of the scope of patent application, the fine adjustment control unit is further used to perform the following steps when performing the flame current determination procedure: According to the flame current value fed back by the flame current detection unit, determine whether there is an abnormality in flameout; if it is determined that there is an abnormality in flameout, adjust the flame current judgment reference value; if it is determined that there is no abnormality in flameout, then determine the flame current value . For example, in the water heater minimum heating capacity adjustment system described in item 3 of the scope of patent application, the fine adjustment control unit is further used to perform the following steps when determining the flame current value: According to the flame current value fed back by the flame current detection unit, determine whether it is greater than or equal to a predetermined percentage of the flame current determination reference value; if it is determined to be greater than or equal to the predetermined percentage of the flame current determination reference value, determine the flame current value No abnormality; if it is determined that the flame current is not greater than or equal to the predetermined percentage of the flame current determination reference value, it is determined that the flame current value is abnormal. For example, the water heater minimum heating capacity adjustment system described in item 1 of the scope of patent application, wherein the fine adjustment control unit is used to execute after setting the minimum number of the water heater main body after fine adjustment to the new minimum number of the water heater main body The following steps: According to the flame current value fed back by the flame current detection unit, judge whether there is a flameout abnormality; if it is judged that there is a flameout abnormality, perform the minimum number dynamic fine-tuning program; if it is judged that there is no flameout abnormality, the unit is detected according to the outlet water temperature The feedback of the outlet water temperature value determines that the outlet water temperature value has not reached the minimum predetermined temperature value, and then the minimum number dynamic fine-tuning procedure is performed. A method for adjusting the minimum heating capacity of a water heater is suitable for a water heater minimum heating capacity adjusting system. The water heater minimum heating capacity adjusting system includes: a water heater host connected to a cold water pipe and a hot water pipe. The water heater host has a burner; an inlet water temperature detection unit installed on the cold water pipeline; an outlet water temperature detection unit installed on the hot water pipeline; A flame current detection unit, which is arranged in the main body of the water heater and adjacent to the burner; a gas valve, which is connected to the burner through a gas pipeline; and a fine adjustment control unit, which is electrically connected to the main body of the water heater The inlet water temperature detection unit, the outlet water temperature detection unit, the flame current detection and the gas valve, the fine-tuning control unit stores a water heater output curve, the water heater output curve is based on the maximum number to the minimum number of the water heater host The number corresponds to the relationship curve of different gas valve openings. The method of the water heater minimum heating capacity modulation system includes: Using the fine-tuning control unit, according to the outlet water temperature value fed back by the outlet water temperature detecting unit, determine whether the outlet water temperature value reaches a minimum predetermined temperature value of the water heater host; If it is judged that the outlet water temperature value has not reached the minimum predetermined temperature value, perform the minimum number dynamic fine-tuning program to temporarily dynamically fine-tune the minimum number of the water heater host and the corresponding gas valve opening according to the water heater output curve. If it is determined that there is no abnormality, the minimum number of the water heater main unit after fine-tuning is set as the new minimum number of the water heater main unit, according to the flame current value fed back by the flame current detection unit. number. The method for adjusting the minimum heating capacity of a water heater as described in item 6 of the scope of patent application, wherein the steps of the minimum number of dynamic fine-tuning procedures further include the following steps: Using the fine-tuning control unit, according to the flame current value fed back by the flame current detection unit, judge whether there is a flameout abnormality; if it is judged that there is a flameout abnormality, temporarily and dynamically increase the minimum number of the water heater host and the corresponding gas Valve opening; if it is judged that there is no flameout abnormality, temporarily and dynamically reduce the minimum number of the water heater host and the corresponding gas valve opening. In the method for adjusting the minimum heating capacity of a water heater as described in item 6 of the scope of patent application, the steps of the flame current determination procedure further include the following steps: Use the fine-tuning control unit to determine whether there is a flame current abnormality based on the flame current value fed back by the flame current detection unit; if it is determined that there is a flameout abnormality, adjust the flame current determination reference value; if it is determined that there is no flameout abnormality, then Judge the flame current value. As described in item 8 of the scope of patent application, the method for adjusting the minimum heating capacity of a water heater, wherein the step of determining the flame current value further includes the following steps: Using the fine-tuning control unit, judge whether the flame current value fed back by the flame current detection unit is greater than or equal to a predetermined percentage of the flame current determination reference value; if it is determined that it is greater than or equal to the predetermined percentage of the flame current determination reference value, It is determined that the flame current value is not abnormal; if it is determined that it is not greater than or equal to the predetermined percentage of the flame current determination reference value, it is determined that the flame current value is abnormal. The method for adjusting the minimum heating capacity of a water heater as described in item 6 of the scope of patent application, wherein after the step of setting the minimum number of the water heater main body after fine-tuning to the new minimum number of the water heater main body, the following steps are further included: Use the fine-tuning control unit to determine whether there is a flameout abnormality based on the flame current value fed back by the flame current detection unit; if it is determined that there is a flameout abnormality, perform the minimum number dynamic fine-tuning program; if it is determined that there is no flameout abnormality, and according to The outlet water temperature value fed back by the outlet water temperature detecting unit determines that the outlet water temperature value has not reached the minimum predetermined temperature value, and then the minimum number dynamic fine-tuning procedure is performed.

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