CN111829185B - Control method of gas water heater - Google Patents
Control method of gas water heater Download PDFInfo
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- CN111829185B CN111829185B CN201910304626.4A CN201910304626A CN111829185B CN 111829185 B CN111829185 B CN 111829185B CN 201910304626 A CN201910304626 A CN 201910304626A CN 111829185 B CN111829185 B CN 111829185B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 476
- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000001960 triggered effect Effects 0.000 claims description 10
- 238000003287 bathing Methods 0.000 abstract description 16
- 238000009835 boiling Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000006210 lotion Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000002453 shampoo Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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Abstract
The invention discloses a control method of a gas water heater. The control method of the gas water heater comprises the following steps: step 1, when detecting that water flows in a water channel of the gas water heater, detecting a difference value between the water outlet temperature of the gas water heater and a set temperature; step 2, if the difference value between the detected water outlet temperature of the gas water heater and the set temperature is smaller than a first preset temperature difference value, firstly cutting off a water channel of the gas water heater through an electric control valve, then starting a burner of the gas water heater, and finally restarting the water channel of the gas water heater; and 3, starting the burner of the gas water heater if the difference between the detected outlet water temperature of the gas water heater and the set temperature is not less than a first preset temperature difference. So as to reduce the water temperature fluctuation range of the gas water heater and improve the bathing experience of users.
Description
Technical Field
The invention belongs to the technical field of household appliances, and particularly relates to a control method of a gas water heater.
Background
At present, a gas water heater is a common household appliance in daily life, and the gas water heater utilizes combustible gas to heat water to achieve the purpose of providing hot water. The start and stop of the burner in the gas water heater are mainly controlled by the water flow, when a user opens water, the water flow passing through the gas water heater reaches a set value, the burner is ignited to heat water, and when the user closes the water, the burner is automatically extinguished. In the actual use process, the user has the operation of switching on and off the water for a short time in the bathing process, and in the process, the burner is ignited after being extinguished. During ignition, part of water is output without being heated, so that water temperature fluctuation is caused. How to design an electric water heater with a small water temperature fluctuation range to improve the bathing experience of a user is the technical problem to be solved by the invention.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a control method of a gas water heater, so as to reduce the water temperature fluctuation range of the gas water heater and improve the bathing experience of a user.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
the invention provides a control method of a gas water heater, wherein an electric control valve is arranged on a water path of the gas water heater, and the control method comprises the following steps:
step 1, when detecting that water flows in a water channel of the gas water heater, detecting a difference value between the water outlet temperature of the gas water heater and a set temperature;
and 3, starting the burner of the gas water heater if the difference between the detected outlet water temperature of the gas water heater and the set temperature is not less than a first preset temperature difference.
Further, the step 2 specifically comprises: after the water way of the gas water heater is cut off by the electric control valve, the igniter of the gas water heater is started firstly, and the water way of the gas water heater is started after the start operation of the burner of the gas water heater is detected.
Further, the starting of the igniter of the gas water heater specifically comprises: starting a fan of the gas water heater and opening an air valve of the gas water heater, and starting an igniter of the gas water heater when the air speed of the fan reaches an ignition air speed.
Further, the step 2 of starting the burner of the gas water heater specifically includes: the combustor is operated at minimum load.
Further, the combustor is operated at a minimum load, specifically: and calculating the required heat load compensation quantity of the gas water heater according to the difference value between the outlet water temperature of the gas water heater and the set temperature, further calculating the time t of the burner of the gas water heater running at the minimum load, and restarting the water path of the gas water heater after the burner of the gas water heater runs for the time t at the minimum load.
Further, in the step 1, after the water path of the gas water heater is restarted, the gas water heater controls the operation of the burner according to the actually required heat load.
Furthermore, the gas water heater is also provided with a water use ending trigger, and a water channel of the gas water heater is connected with a water use terminal through a connecting water pipe; the control method further comprises the following steps: and 4, after the trigger is triggered after water consumption is finished, firstly closing the burner of the gas water heater, and cutting off the water way of the gas water heater through the electric control valve after residual hot water between the gas water heater and the water consumption terminal flows out from the water consumption terminal.
Furthermore, a terminal water temperature sensor is arranged on the water using terminal; the step 4 specifically comprises the following steps: after the burner of the gas water heater is closed, when the difference value between the water temperature detected by the terminal water temperature sensor and the set temperature of the gas water heater is greater than a second preset temperature difference value, the water way of the gas water heater is cut off through the electric control valve.
Furthermore, a flow sensor is arranged on a water path of the gas water heater; the step 4 specifically comprises the following steps: after the burner of the gas water heater is closed, when the water flow detected by the flow sensor is larger than a preset flow value, the water way of the gas water heater is cut off through the electric control valve.
Further, the step 4 specifically includes: after the burner of the gas water heater is closed and a set time length is passed, the water way of the gas water heater is cut off by the electric control valve.
Compared with the prior art, the invention has the advantages and positive effects that: the electric control valve is arranged on the water way of the gas water heater, and is used for controlling the on-off of the water way of the gas water heater, during the bathing process of the user, whether the user does not use water for a long time can be judged according to whether the difference value between the detected water outlet temperature of the water heater and the set temperature exceeds the preset temperature difference value, if the difference value between the detected outlet water temperature and the set temperature is less than the preset temperature difference value, which indicates that the user turns on the water supply again after turning off the water supply for a short time, at the moment, the electric control valve is utilized to cut off the water path and start the burner first, the water way is opened again after the burner is started, so that cold water entering the gas water heater can be effectively heated in time, therefore, water on the user side of the flow channel is always heated hot water, the condition of large water temperature fluctuation caused by short-time water closing and water boiling is effectively reduced, and the bathing experience of the user is improved.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of an electric water heater according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the specific structural configuration of the gas water heater generally includes a housing 1, and a burner 2, a heat exchange water pipe 3, a fan (not shown), a gas valve (not shown) and other components arranged in the housing 1, wherein an igniter (not shown) is arranged on the burner 2 for ignition, flame generated by the burner 3 heats water flowing through the heat exchange water pipe 3, and the heat exchange water pipe 3 constitutes a water path of the gas water heater. The invention is not limited aiming at the specific structural form of the gas water heater, wherein, in order to reduce the fluctuation range of the water temperature in the process of cutting off water supply and boiling water again for a short time, the invention provides a control method of the gas water heater, wherein, an electric control valve 4 is configured on a water path of the gas water heater, and the control method comprises the following steps:
step 1, when detecting that water flows in a water channel of the gas water heater, detecting the difference value between the water outlet temperature of the gas water heater and the set temperature. Specifically, when a user starts to take a bath or just begins to take a bath, after the water valve 5 at the water use terminal is opened, water flows through the water channel of the gas water heater, at the moment, the flow sensor arranged on the water channel of the gas water heater can detect the water flows, the difference value between the water outlet temperature of the gas water heater and the set temperature is compared, and the fact that the user starts to take a bath and turns on water or the user cuts off water and boils water within a short time in the bath process is judged according to the difference value. The specific installation position of the flow sensor can be installed on a water inlet or a water outlet of the heat exchange water pipe 3, and is not limited herein.
And 2, if the difference value between the detected water outlet temperature of the gas water heater and the set temperature is smaller than a first preset temperature difference value, cutting off the water channel of the gas water heater through an electric control valve, starting a burner of the gas water heater, and finally restarting the water channel of the gas water heater. Specifically, when the difference between the outlet water temperature and the set temperature is smaller than a first preset temperature difference, it is determined that the user temporarily closes the water and then boils the water in the bathing process (for example, the user closes the water to make bath lotion or shampoo after getting wet), at this time, the temperature drop value of the outlet water temperature is small in the process that the burner of the gas water heater is temporarily extinguished, so that the difference between the outlet water temperature and the set temperature is smaller than the difference between the outlet water temperature and the set temperature set before the user bathes the water, at this time, the water path of the gas water heater can be immediately cut off through the electric control valve, and at this time, the user opens the water valve 5 at the water using terminal but no water flows out. And after the electric control valve cuts off the water channel, the burner of the gas water heater is started, and after the burner is ignited and started, the electric control valve is opened again to restart the water channel of the gas water heater, so that cold water newly flowing into the gas water heater can be heated by the burner in time to form hot water, and the condition that part of cold water is not heated and output in the process of turning off the water and then turning on the water for a short time to cause large water temperature fluctuation is effectively avoided. The first preset temperature difference value may be obtained through a limited number of experiments before leaving a factory, and is generally in the range of 1-5 degrees.
And 3, starting the burner of the gas water heater if the difference between the detected outlet water temperature of the gas water heater and the set temperature is not less than a first preset temperature difference. Specifically, when the difference between the outlet water temperature and the set temperature is not less than a first preset temperature difference, it is determined that the user is the initial water use when bathing is just started, and the gas water heater is installed in a conventional operation mode, that is, the actually required heat load is obtained according to the set temperature and the water flow of the user to control the opening sizes of the fan and the gas valve. Under the condition that the difference value between the outlet water temperature and the set temperature is not less than the first preset temperature difference value, the electric control valve is in an open state, and the specific control process of the gas water heater can refer to the control mode of a conventional gas water heater, which is not limited and described herein.
Further, the step 2 specifically comprises: after the water way of the gas water heater is cut off by the electric control valve, the igniter of the gas water heater is started firstly, and the water way of the gas water heater is started after the start operation of the burner of the gas water heater is detected. Specifically, when the difference between the outlet water temperature and the set temperature is smaller than a first preset temperature difference value and the situation that the user temporarily shuts off water and then boils water is judged, the electric control valve firstly starts an igniter of the gas water heater after cutting off a water path of the gas water heater, a fan and an air valve of the gas water heater are both opened before the igniter starts, and when the air speed of the fan reaches an ignition air speed, the igniter ignites to enable the burner to start to work.
Preferably, in order to avoid overheating of the water temperature, the burner is operated at the minimum load after the igniter is ignited, so that on one hand, cold water just entering the gas water heater can be effectively heated, and meanwhile, the existing hot water in the gas water heater can be prevented from being overheated to form hot water with too high temperature, so that the output water temperature is prevented from being too high, and the user experience is optimized. Wherein, the combustor is with minimum load operation specifically: and calculating the required heat load compensation quantity of the gas water heater according to the difference value between the outlet water temperature of the gas water heater and the set temperature, further calculating the time t of the burner of the gas water heater running at the minimum load, and restarting the water path of the gas water heater after the burner of the gas water heater runs for the time t at the minimum load. Specifically, after the user temporarily closes the water, the water closing time determines the temperature reduction and reset of the hot water stored in the gas water heater, the longer the water closing time is, the more the water temperature is reduced, correspondingly, when the water is restarted, the longer the water path is cut off through the electric control valve is, at this time, the burner of the gas water heater heats the water in the gas water heater in the period of cutting off the water path, and in order to calculate the time length t of the burner operating at the minimum load more accurately, the heat load compensation amount required for heating the water in the gas water heater to the set temperature can be calculated through a thermodynamic formula according to the difference between the water outlet temperature and the set temperature, the specific minimum load operation time length t can be calculated according to the heat load which can be generated in the unit time of the burner operating at the minimum load, and the water outlet temperature can be controlled more effectively, the fluctuation range of the water temperature is reduced. The method for calculating the specific duration by using the temperature difference and the thermodynamic formula is not limited and described herein.
Furthermore, in step 1, after the water path of the gas water heater is restarted, the gas water heater controls the operation of the burner according to the actually required heat load. Specifically, after a user temporarily turns off water and then boils water in a bathing process, the burner is started to heat water in the gas water heater, and the water channel is opened again, then the gas water heater operates according to a heating mode preset by the user, namely, the actually required heat load is obtained according to the set temperature and water flow of the user to control the opening size of the fan and the air valve.
The electric control valve is arranged on the water way of the gas water heater, and is used for controlling the on-off of the water way of the gas water heater, during the bathing process of the user, whether the user does not use water for a long time can be judged according to whether the difference value between the detected water outlet temperature of the water heater and the set temperature exceeds the preset temperature difference value, if the difference value between the detected outlet water temperature and the set temperature is less than the preset temperature difference value, which indicates that the user turns on the water supply again after turning off the water supply for a short time, at the moment, the electric control valve is utilized to cut off the water path and start the burner first, the water way is opened again after the burner is started, so that cold water entering the gas water heater can be effectively heated in time, therefore, water on the user side of the flow channel is always heated hot water, the condition of large water temperature fluctuation caused by short-time water closing and water boiling is effectively reduced, and the bathing experience of the user is improved.
Based on the above technical solution, optionally, as shown in fig. 1, the gas water heater is further configured with a water end trigger 6, and a water path of the gas water heater is connected with a water end through a connecting water pipe; the control method further comprises the following steps: and 4, when the water use end trigger 6 is triggered, firstly closing the burner of the gas water heater, and after the residual hot water between the gas water heater and the water use terminal flows out of the water use terminal, cutting off the water way of the gas water heater through the electric control valve. Specifically, in the bathing process of a user, because a certain distance exists between the gas water heater and the water using terminal and the gas water heater and the water using terminal is connected through the connecting water pipe, after the bathing of the existing water heater user is finished, more hot water still remains in the gas water heater and the connecting water pipe, the water is often wasted, and through the configuration of the water using end trigger 6, the user usually needs to clean parts such as feet by using hot water after the bathing is finished, at the moment, the hot water remaining in the gas water heater and the connecting water pipe can be repeatedly used, and cold water does not need to be continuously heated through the gas water heater. The specific process is as follows: after a user triggers the water use end trigger 6, the burner of the gas water heater stops working, but the electric control valve 4 is still in an open state at the moment, so that hot water in the gas water heater and the connecting water pipe is output from the water valve 5 at the water terminal, and after residual hot water between the gas water heater and the water terminal is used up, the water way of the gas water heater can be automatically cut off through the electric control valve 4 so as to finish the bathing process; of course, after the user triggers the water end trigger 6, the user can also close the water valve 5 before the residual hot water is used up to finish the bathing in advance. The concrete representation entity of the water end trigger 6 may be implemented by a switch, a voice recognizer, and the like, which is not limited herein.
The control method for automatically cutting off the water path of the electric control valve 4 after the residual hot water is used up has the following forms.
In the first mode, a terminal water temperature sensor is arranged on a water terminal; the step 4 specifically comprises the following steps: after the burner of the gas water heater is closed, when the difference value between the water temperature detected by the terminal water temperature sensor and the set temperature of the gas water heater is greater than a second preset temperature difference value, the water way of the gas water heater is cut off through the electric control valve. Specifically, the terminal water temperature sensor disposed at the water use terminal may detect the water temperature output from the water valve 5, and when it is detected that the difference between the water temperature output from the water valve 5 and the set temperature of the gas water heater is greater than a second preset temperature difference value, it is determined that the remaining hot water is used up, and the electronic control valve 4 is triggered to cut off the water path of the gas water heater.
In the second mode, a flow sensor is arranged on a water path of the gas water heater; the step 4 specifically comprises the following steps: after the burner of the gas water heater is closed, when the water flow detected by the flow sensor is larger than a preset flow value, the water way of the gas water heater is cut off through the electric control valve. Specifically, a flow sensor can be arranged at the water inlet or the water outlet of the water channel of the gas water heater, after the user triggers the water consumption ending trigger 6, the flow sensor will continue to detect the water flow output by the gas water heater, and when the water flow reaches a preset flow value, the electric control valve 4 is triggered to cut off the water channel of the gas water heater. Wherein, because the lengths of the connecting water pipes between the gas water heater and the water using terminal are different in different users, and the water amounts which can be stored in the connecting water pipes with different lengths are also different, in the process of using the gas water heater for the first time by the user, the process of the first learning can be added aiming at the reuse of the residual hot water, namely, the program of the controller of the gas water heater is provided with a learning mode, after the user starts the learning mode, after the trigger 6 for ending the water using is triggered for the first time, the burner of the gas water heater is closed and the water amount is detected by the flow sensor, after the water using terminal considers that the residual hot water is used up according to the water temperature experienced by the user, the trigger 6 for ending the water using is triggered again, at the moment, the electric control valve 4 cuts off the water path of the gas water heater, and simultaneously, the controller of the gas water heater stores the water flow value detected by the flow sensor and sets the water flow value as the preset flow value, and in the later stage of water use of the user, judging the use amount of the residual hot water according to the preset flow value determined by detection.
In a third mode, the step 4 specifically comprises: after the burner of the gas water heater is closed and a set time length is passed, the water way of the gas water heater is cut off by the electric control valve. Specifically, after a user triggers the water use end trigger 6, the burner of the gas water heater is closed, the gas water heater continues to output water, when the time for outputting water of the gas water heater in the state of closing the burner reaches a set time, the residual hot water is judged to be used up, and at the moment, the electric control valve 4 is triggered to cut off the water channel of the gas water heater. The length of the connecting water pipe between the gas water heater and the water using terminal is different in different user homes, and the water amount which can be stored by the connecting water pipes with different lengths is also different, so that in the process of using the gas water heater for the first time by a user, the process of primary learning can be increased aiming at the reuse of residual hot water, namely, a program of a controller of the gas water heater is provided with a learning mode, after the user starts the learning mode, after the trigger 6 for ending water use is triggered for the first time, a burner of the gas water heater is closed and the controller is used for timing, after the user considers that the residual hot water is used up according to the water temperature experienced by the user at the water using terminal, the trigger 6 for ending water use is triggered again, at the moment, the electric control valve 4 cuts off the water path of the gas water heater, and meanwhile, the time consumed by the controller of the storage is used as the set time length. And in the later-stage water using process of the user, judging whether the residual hot water is used up or not according to the set time length.
For the first to third modes, after the user uses up the residual hot water, the user can be reminded to close the water valve 5 at the water use terminal in the modes of sound, light, electricity and the like, and the specific reminding mode is not limited.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. A control method of a gas water heater is characterized in that an electric control valve is arranged on a water path of the gas water heater, a water end trigger is also arranged on the gas water heater, and the water path of the gas water heater is connected with a water end through a connecting water pipe, and the control method comprises the following steps:
step 1, when detecting that water flows in a water channel of the gas water heater, detecting a difference value between the water outlet temperature of the gas water heater and a set temperature;
step 2, if the difference value between the detected water outlet temperature of the gas water heater and the set temperature is smaller than a first preset temperature difference value, firstly cutting off a water channel of the gas water heater through an electric control valve, then starting a burner of the gas water heater, and finally restarting the water channel of the gas water heater;
step 3, if the difference value between the detected water outlet temperature of the gas water heater and the set temperature is not smaller than a first preset temperature difference value, starting a burner of the gas water heater;
and 4, after the trigger is triggered after water consumption is finished, firstly closing the burner of the gas water heater, and cutting off the water way of the gas water heater through the electric control valve after residual hot water between the gas water heater and the water consumption terminal flows out from the water consumption terminal.
2. The control method of the gas water heater according to claim 1, wherein the step 2 is specifically:
after the water way of the gas water heater is cut off by the electric control valve, the igniter of the gas water heater is started firstly, and the water way of the gas water heater is started after the start operation of the burner of the gas water heater is detected.
3. The control method of the gas water heater according to claim 2, wherein the starting of the igniter of the gas water heater is specifically:
starting a fan of the gas water heater and opening an air valve of the gas water heater, and starting an igniter of the gas water heater when the air speed of the fan reaches an ignition air speed.
4. The control method of the gas water heater according to claim 1, wherein the step 2 is to start a burner of the gas water heater, specifically: the combustor is operated at minimum load.
5. Method for controlling a gas water heater according to claim 4, characterized in that said burner is operated at minimum load, in particular:
and calculating the required heat load compensation quantity of the gas water heater according to the difference value between the outlet water temperature of the gas water heater and the set temperature, further calculating the time t of the burner of the gas water heater running at the minimum load, and restarting the water path of the gas water heater after the burner of the gas water heater runs for the time t at the minimum load.
6. The control method of the gas water heater according to claim 5, wherein in the step 1, after the water path of the gas water heater is turned on again, the gas water heater controls the operation of the burner according to the actually required heat load.
7. The control method of the gas water heater according to claim 1, wherein a terminal water temperature sensor is provided on the water using terminal;
the step 4 specifically comprises the following steps: after the burner of the gas water heater is closed, when the difference value between the water temperature detected by the terminal water temperature sensor and the set temperature of the gas water heater is greater than a second preset temperature difference value, the water way of the gas water heater is cut off through the electric control valve.
8. The control method of the gas water heater according to claim 1, wherein a flow sensor is disposed on a water path of the gas water heater;
the step 4 specifically comprises the following steps:
after the burner of the gas water heater is closed, when the water flow detected by the flow sensor is larger than a preset flow value, the water way of the gas water heater is cut off through the electric control valve.
9. The control method of the gas water heater according to claim 1, wherein the step 4 is specifically:
after the burner of the gas water heater is closed and a set time length is passed, the water way of the gas water heater is cut off by the electric control valve.
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| CN113718469B (en) * | 2021-09-14 | 2023-10-03 | 深圳拓邦股份有限公司 | Washing machine heating control method and device and washing machine |
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| JP2013224782A (en) * | 2012-04-20 | 2013-10-31 | Rinnai Corp | Hot water supply system |
| CN104566998A (en) * | 2014-12-23 | 2015-04-29 | 广东万和电气有限公司 | Reservation control method of water heater, server and system |
| CN108224752A (en) * | 2017-12-30 | 2018-06-29 | 佛山市集知汇科技有限公司 | It is a kind of can uninterrupted hot-water supply gas heater |
| CN109140779A (en) * | 2018-07-19 | 2019-01-04 | 中国二十冶集团有限公司 | A kind of combustion gas water circulation system and gas heater |
| CN109237798A (en) * | 2018-08-08 | 2019-01-18 | 珠海格力电器股份有限公司 | Control method of gas combustion device and gas combustion device |
| CN109442729A (en) * | 2018-12-15 | 2019-03-08 | 成都前锋电子有限责任公司 | A kind of zero cold water water outlet control method of zero cold water fuel wall hanging furnace system |
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