CN107192134A - A kind of fuel gas water heating system and its self study pre-heating mean - Google Patents
A kind of fuel gas water heating system and its self study pre-heating mean Download PDFInfo
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- CN107192134A CN107192134A CN201710320472.9A CN201710320472A CN107192134A CN 107192134 A CN107192134 A CN 107192134A CN 201710320472 A CN201710320472 A CN 201710320472A CN 107192134 A CN107192134 A CN 107192134A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 238
- 238000010438 heat treatment Methods 0.000 title claims abstract description 70
- 239000002737 fuel gas Substances 0.000 title claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 40
- 230000003044 adaptive effect Effects 0.000 claims description 25
- 230000006870 function Effects 0.000 claims description 20
- 239000000567 combustion gas Substances 0.000 claims description 4
- 230000008859 change Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)
Abstract
The present invention, which provides a kind of fuel gas water heating system, includes gas heater, some use water spots and the connection gas heater and the supply channel with water spot, gas heater includes controller, heat exchanger, water pump, water inlet and delivery port, water pump is arranged on water inlet, the entrance of water pump is connected with water supply pipe, and water pump is connected with controller signals, water inlet end, water side in heat exchanger are respectively arranged with the inflow temperature sensor being connected with the controller signals, leaving water temperature sensors；Supply channel includes being connected in parallel to cold water pipeline with water spot by water supply pipe, and is connected in parallel to the hot water line with water spot by the delivery port of gas heater, and the distalmost end of hot water line and cold water pipeline is provided with the check valve that cold water pipeline is flowed to by hot water line.The problem of invention is thoroughly solved without that can not use cold water after the completion of being preheated in the case of water return pipeline, realizes and opens i.e. cold again while instant-heating is realized.The present invention also provides a kind of self study pre-heating mean.
Description
Technical field
The present invention relates to fuel gas water heating system technical field, more particularly to a kind of fuel gas water heating system and its self study preheating
Method.
Background technology
Various bands in the market preheat the gas heater of function, realize to a certain extent gas heater i.e.
I.e. hot merit energy is opened, but is directed to the mounting means without water return pipeline, while gas heater instant-heating function is realized, such as
What meets the demand that user uses cold water, is also come out at present without Related product.Other in the market can not judge that user manages yet
The gas heater of road length, and also referred to without Patents data therefore, how to realize the basis of instant-heating function
On, meet user and i.e. cold demand is opened to cold water, be those skilled in the art's urgent problem to be solved.
The content of the invention
In view of this, the present invention is directed to propose a kind of fuel gas water heating system, to solve realizing the base of instant-heating function
On plinth, the problem of cold water opens i.e. cold function how is realized.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of fuel gas water heating system, including gas heater, some use water spots and the connection gas heater are with using
The supply channel of water spot；The supply channel includes the cold water pipeline that the use water spot is connected in parallel to by the water supply pipe, with
And the hot water line of the use water spot, the hot water line and the cold water pipe are connected in parallel to by the delivery port of the gas heater
The distalmost end on road is provided with the check valve that cold water pipeline is flowed to by hot water line；The gas heater includes controller, heat and handed over
Parallel operation, water pump, water inlet and delivery port, the water pump are arranged on the water inlet, the entrance and running water of the water pump
Pipeline communication, and the water pump is connected with the controller signals；Characterized in that, water inlet end, water side in heat exchanger
Be respectively arranged with the inflow temperature sensor being connected with the controller signals, leaving water temperature sensors, the controller according to
Inflow temperature sensor, the signal of leaving water temperature sensors feedback obtain the lowest temperature rise of gas heater, the lowest temperature rise
The temperature that leaving water temperature sensors are detected when being burnt for combustion gas minimum load subtracts the temperature that inflow temperature sensor is detected.
Further, operation display is connected with the controller, is adjusted on operation display provided with preheating time parameter
Save button and add, subtract button, for adjusting the length of preheating time.
Relative to prior art, the fuel gas water heating system that the present invention is provided has the advantage that：
1st, it can accurately judge that water circulation one encloses required time t in pipeline, and make pump operation in preheating next time
Second, it is ensured that hot water is full of in hot water line in circulation line, and after the completion of the preheating of cold water pipeline is still warm water or cold water, thoroughly
The problem of solving without that can not use cold water after the completion of being preheated in the case of water return pipeline, again can be real while " instant-heating " is realized
Existing " opening i.e. cold " pattern.
2nd, by setting preheating time parameter regulation button, be easy to according to the actual installation situation of actual gas heater from
Main modulation preheating next time duration, practicality is good.
It is a further object of the present invention to provide a kind of self study pre-heating mean for above-mentioned fuel gas water heating system, to solve
On the basis of instant-heating function is realized, the problem of cold water opens i.e. cold function how is realized.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of self study pre-heating mean for above-mentioned fuel gas water heating system, comprises the following steps：
Step one, the adaptive learning of the fuel gas water heating system is set as state one and state two；
Step 2, after the fuel gas water heating system starts preheating function, recognizes the self study of the fuel gas water heating system
State；
Step 3, if the adaptive learning is state one, in the case where meeting pipeline start up by preheating condition, preheating one is followed
Ring simultaneously record water pump duration of runs t and preheating after the temperature T1 that detects of leaving water temperature sensors, while by adaptive learning
It is set to state two；
Step 4, if the adaptive learning is state two, in the case where meeting pipeline start up by preheating condition, starts preheating at
Second, wherein, a is the coefficient more than 0 and less than 1.
Further, " the meeting pipeline start up by preheating condition " in the step 3 refers to Td<T-T0, wherein, Td is water temperature
The temperature that real-time monitors of degree sensor, T is the temperature set on gas heater, and 36 DEG C≤T≤60 DEG C, and T0 is temperature difference
Value, and 3 DEG C≤T0≤10 DEG C.
Further, in the step 3 " one circulation of preheating " refer to recirculated water by gas heater water outlet A extremely
Check valve B, then to water supply pipe and the water inlet pipe tie point C of gas heater, then to gas heater, then to water outlet A
Circulation one is enclosed.
Further, " one circulation of preheating " refers to Td ＞ T+M in the step 3, and the duration is more than or equal to 3 seconds,
Wherein, M is less than or equal to the lowest temperature rise of gas heater.
Further, " the meeting pipeline start up by preheating condition " in the step 4 refers to Td<T-T0+M, wherein, M is less than or equal to
The lowest temperature rise of gas heater.
Further, the self study pre-heating mean is further comprising the steps of：
Step 5, when being preheated under conditions of the fuel gas water heating system is state two in adaptive learning, record
Start the temperature T2 after preheating detected by leaving water temperature sensors every time, and being averaged for T2 is calculated according to the number of times of pipeline start up by preheating
Value, if the average value is compared with T1, when fluctuating more than or equal to 2, is then set to state one by adaptive learning.
Further, before the fuel gas water heating system is run first, adaptive learning default setting is state one.
Further, the self study pre-heating mean also includes, after preheating function on, if leaving water temperature sensors are examined
The temperature measured is more than 66 DEG C in continuous 3 seconds, or water pump was continuously run more than 20 minutes, then stops preheating function, and shut down
Water pump.
Further, the span of a is 0.4≤a≤0.6.
Further, described T0=5 DEG C.
Further, the M=5K.
Relative to prior art, the self study pre-heating mean of fuel gas water heating system of the present invention has the advantage that：
1st, self study pre-heating mean of the present invention, by learning first, water circulation one encloses institute in accurate calculation pipeline
The time t needed, pump operation at seconds when being preheated its next time by programme-control, it is ensured that filled in circulation line in hot water line
Full hot water, and after the completion of the preheating of cold water pipeline still it is warm water or cold water, after the completion of thoroughly solving without being preheated in the case of water return pipeline
The problem of cold water can not being used, " opening i.e. cold " pattern can be realized while " instant-heating " is realized again.
2nd, self study pre-heating mean of the present invention, is perceived by the amplitude of variation of mean temperature after two times preheatings of state
The change of the factors such as external environment, circulating water flow, and then by relearning, recalculate water circulation one in pipeline and enclose required
The time wanted, the intelligent adjustment of preheating time is realized, Consumer's Experience sense is greatly strengthen.
3rd, self study pre-heating mean of the present invention, is opened before preheating function pump operation, first judges whether to meet pre-
Thermal starting condition, is unsatisfactory for just not starting Water heater igniting burning temporarily, untill condition is met, prevents user misoperation,
Realize intelligent fault tolerance.
Brief description of the drawings
The accompanying drawing for constituting the part of the present invention is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the structural representation of the fuel gas water heating system described in the embodiment of the present invention；
Fig. 2 is the flow chart of self study pre-heating mean described in the embodiment of the present invention.
Description of reference numerals：
1- water pumps 1,2- inflow temperature sensors, 3- controllers, 4- leaving water temperature sensors, 5- check valves, 6- heat exchanges
Device.
Embodiment
It should be noted that in the case where not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Mutually combination.
As shown in figure 1, described in the present embodiment fuel gas water heating system structural representation, the fuel gas water heating system include combustion
Gas water heater, some use water spots and the connection gas heater and the supply channel with water spot, the gas heater bag
Controller 3, heat exchanger 6, water pump 1, water inlet and delivery port are included, the water pump 1 is arranged on the water inlet, the water
The entrance of pump 1 is connected with water supply pipe, and the water pump 1 is connected with the signal of controller 3, is set in the water outlet
There are the leaving water temperature sensors 4 being connected with the signal of controller 3；The supply channel includes in parallel by the water supply pipe
To the cold water pipeline of the use water spot, and it is connected in parallel to by the delivery port of the gas heater hot-water line of the use water spot
The distalmost end of road, the hot water line and the cold water pipeline is provided with the check valve 5 that cold water pipeline is flowed to by hot water line, should
Hot water line and cold water pipeline are divided into two parts of same length by check valve 5.It is additionally provided with the water inlet
The inflow temperature sensor 2 being connected with the signal of controller 3.Specifically, the inflow temperature sensor 2 is arranged on the water
On the pipeline being exported between the heat exchanger 6 of pump 1.
As shown in FIG., it is for water supply pipe and combustion gas at check valve 5, C at the delivery port of gas heater, B to be at A
The junction of the water inlet pipe of water heater.One circulation waterway, gas and hot water may be constructed by A-B-C- water pump 1- heat exchangers 6-A
Device exactly restarts the water circulation flowing in the driving cycle water route of water pump 1 when starting preheating, meanwhile, Water heater igniting is with most
Water in low-temperature-rise heat cycles water route.
The invention also discloses a kind of self study pre-heating mean for above-mentioned fuel gas water heating system, the main think of of this method
Want to comprise the following steps：
Step one, the adaptive learning of fuel gas water heating system is set as state one and state two, it is first in fuel gas water heating system
Before secondary operation, adaptive learning default setting is state one；
Step 2, after fuel gas water heating system starts preheating function, recognizes the adaptive learning of fuel gas water heating system；
Step 3, if adaptive learning is state one, in the case where meeting pipeline start up by preheating condition, preheats a circulation simultaneously
The temperature T1 that leaving water temperature sensors 4 are detected after recording the duration of runs t of water pump 1 and preheating, while adaptive learning is set
It is set to state two；
Step 4, if adaptive learning is state two, in the case where meeting pipeline start up by preheating condition, starts preheating at seconds,
Wherein, a span is 0.4≤a≤0.6, is specifically determined by actual test effect.Operation is connected with controller 3 aobvious
Show device, preheating time parameter regulation button is provided with operation display.Touch and start after the button, regulation plus-minus button
Realize the adjustment of a values.In the present embodiment, because of the same length of cold water pipe and hot-water line, so a values 0.5, start preheating
0.5t seconds, that is to say, that only preheat half cycles；
Step 5, when being preheated under conditions of the fuel gas water heating system is state two in adaptive learning, record
Start the temperature T2 after preheating detected by leaving water temperature sensors 4 every time, and the flat of T2 is calculated according to the number of times of pipeline start up by preheating
Average, if the average value is compared with T1, when fluctuating more than or equal to 2, illustrates external environment, the recirculated water of fuel gas water heating system
The factors such as flow change, then adaptive learning are set into state one, during so that next time preheating, reopen self study,
Recalculate water pump 1 duration of runs t.
" meeting pipeline start up by preheating condition " in above-mentioned steps three refers to Td<T-T0, wherein, Td is leaving water temperature sensors
4 temperature real-time monitored, T is the temperature set on gas heater, generally, and T span is 36 DEG C≤T≤60 DEG C,
T0 is temperature gap, and setting range is 3 DEG C≤T0≤10 DEG C, generally takes T0=5 DEG C.
" one circulation of preheating " refers to that recirculated water circulates a circle by A-B-C- water pump 1- heat exchangers 6-A in step 3,
How to judge the circle of warm-up cycle one, be typically according at leaving water temperature sensors 4 water temperature judge, if Td ＞ T+M and continue
Time is more than or equal to 3 seconds, then it is believed that having preheated a circulation.Above-mentioned M is less than or equal to the lowest temperature rise of gas heater, by
Actual test effect determines that the present embodiment value M is 5K." meeting pipeline start up by preheating condition " in step 4 refers to Td<T-T0+
M, wherein, M is 5K in the present embodiment value.In order to ensure the security of system, the self study pre-heating mean described in the present embodiment
Also include, after preheating function on, if the temperature that leaving water temperature sensors 4 are detected is more than 66 DEG C, or water pump 1 for continuous 3 seconds
Continuously run more than 20 minutes, then stop preheating function, and force to shut down water pump 1, and detect temperature it is too high when fire
Gas water heater temperature flickering display, points out user's water temperature over-high.
Fig. 2 is the flow chart of self study pre-heating mean described in the present embodiment, below with reference to the flow chart, is further illustrated
The detailed process of the self study pre-heating mean.Wherein, learning success flag bit=0 is that above-mentioned adaptive learning is state
One, learning success flag bit=1 is that above-mentioned adaptive learning is state two.
Enter Self-learning Model after system electrification start, system opens preheating function, and meets pipeline start up by preheating condition
Td<T-T0, water pump 1 starts Water heater igniting burning；Start main control chip timer timing simultaneously, leaving water temperature sensors 4 are adopted
Sample temperature is denoted as T1, until water pump 1 stops when leaving water temperature sensors 4 detect temperature T1 >=T+M, and records this water pump
1 operating is designated as t total time；After water circulation one in pipeline is enclosed, water heater is burnt with lowest temperature rise, and leaving water temperature sensors 4 are examined
Temperature gap M, the M value of the lowest temperature rise burning measured is determined by actual test effect, typically takes 5K, now learning success mark
Position is 1, and system is stored in water pump 1 duration of runs α t are preheated in the memory of controller 3, and meets pipeline start up by preheating every time afterwards
Condition, the operating set time of water pump 1；Other system is also constrained by Safety limits, and whenever system safely may be used
The operation leaned on.
In addition when water heater sets the factors such as temperature, external environment, circulating water flow to vary widely, system
Adjust automatically preheating time, system is that, by being sampled to leaving water temperature sensors 4, the temperature that calculating pipeline start up by preheating is K times is put down
The temperature T1 that detects of leaving water temperature sensors 4 is compared after preheating when average with learning success flag bit is 0, is found pre-
When hot temperature change is more than or equal to positive and negative 2 degree, learning success flag bit is changed into 0 from 1, and system is relearned automatically, records again
The operating of water pump 1 is designated as t total time, no matter the factor of so other any influence preheating temperatures is varied widely, certain model
The mounting means of no water return pipeline is always ensured that in enclosing while gas heater instant-heating function is realized, meeting user makes
With the demand of cold water, Consumer's Experience sense is significantly lifted.
The self study pre-heating mean of fuel gas water heating system described in the present embodiment has the advantage that：
1st, by learning first, water circulation one encloses required time t in accurate calculation pipeline, by programme-control under it
Water pump 1 is operated at seconds during secondary preheating, it is ensured that be full of hot water in hot water line in circulation line, and after the completion of the preheating of cold water pipeline
Still it is warm water or cold water, the problem of thoroughly solving without that can not use cold water after the completion of being preheated in the case of water return pipeline is being realized " i.e.
Open i.e. hot " while and " opening i.e. cold " pattern can be realized.
2nd, the factors such as amplitude of variation sensing external environment, the circulating water flow of mean temperature after two times preheatings of state are passed through
Change, and then by relearning, recalculate water circulation one in pipeline and enclose the required time, realize the intelligence of preheating time
Change adjustment, greatly strengthen Consumer's Experience sense.
3rd, open before the operating of preheating function water pump 1, first judge whether to meet pipeline start up by preheating condition, be unsatisfactory for just not opening temporarily
Dynamic Water heater igniting burning, untill condition is met, prevents user misoperation, realizes intelligent fault tolerance.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (10)
1. a kind of fuel gas water heating system, including gas heater, some with water spot and connect the gas heater and use water
The supply channel of point；The supply channel includes the cold water pipeline that the use water spot is connected in parallel to by the water supply pipe, and
The hot water line of the use water spot, the hot water line and the cold water pipeline are connected in parallel to by the delivery port of the gas heater
Distalmost end be provided with the check valve (5) that cold water pipeline is flowed to by hot water line；The gas heater include controller (3),
Heat exchanger (6), water pump (1), water inlet and delivery port, the water pump (1) are arranged on the water inlet, the water pump
(1) entrance is connected with water supply pipe, and the water pump (1) is connected with the controller (3) signal；Characterized in that,
The water inlet end of heat exchanger (6), water side are respectively arranged with the inflow temperature sensor being connected with the controller (3) signal
(2), leaving water temperature sensors (4), the controller (3) is anti-according to inflow temperature sensor (2), leaving water temperature sensors (4)
The signal of feedback obtains the lowest temperature rise of gas heater, and the lowest temperature rise is that leaving water temperature is sensed when combustion gas minimum load burns
The temperature that device (4) is detected subtracts the temperature that inflow temperature sensor (2) is detected.
2. the fuel gas water heating system described in claim 1, it is characterised in that be connected with operation display on controller (3),
Operation display is provided with preheating time parameter regulation button and adds, subtracts button, for adjusting the length of preheating time.
3. a kind of self study pre-heating mean for being used to weigh fuel gas water heating system described in 1, it is characterised in that comprise the following steps：
Step one, the adaptive learning of fuel gas water heating system is set as state one and state two, and the fuel gas water heating system is first
Before operation, adaptive learning default setting is state one；
Step 2, after fuel gas water heating system starts preheating function, recognizes the adaptive learning of fuel gas water heating system；
Step 3, if adaptive learning is state one, in the case where meeting pipeline start up by preheating condition, preheats one and circulates and record
The temperature T1 that the duration of runs t of water pump (1) is detected with leaving water temperature sensors (4) after preheating, while adaptive learning is set
It is set to state two；
Step 4, if adaptive learning is state two, in the case where meeting pipeline start up by preheating condition, starts preheating at seconds, wherein,
A is the coefficient more than 0 and less than 1.
4. self study pre-heating mean according to claim 3, it is characterised in that " meet preheating to open in the step 3
Dynamic condition " refers to Td<T-T0, wherein, Td is the temperature that leaving water temperature sensors (4) are real-time monitored, and T is on gas heater
The temperature of setting, and 36 DEG C≤T≤60 DEG C, T0 is temperature gap, and 3 DEG C≤T0≤10 DEG C.
5. self study pre-heating mean according to claim 4, it is characterised in that in the step 3 " one circulation of preheating "
Refer to recirculated water by the water outlet A of gas heater to check valve (5) B, then to the water inlet of water supply pipe and gas heater
Pipe tie point C, then enclosed to gas heater, then to water outlet A circulation one.
6. self study pre-heating mean according to claim 4, it is characterised in that in the step 3 " one circulation of preheating "
Refer to Td ＞ T+M, and the duration is more than or equal to 3 seconds, wherein, M is less than or equal to the lowest temperature rise of gas heater.
7. the self study pre-heating mean according to claim 5 or 6, it is characterised in that " meet preheating in the step 4
Entry condition " refers to Td<T-T0+M, wherein, M is less than or equal to the lowest temperature rise of gas heater.
8. self study pre-heating mean according to claim 7, it is characterised in that the self study pre-heating mean also include with
Lower step：
Step 5, when being preheated under conditions of the fuel gas water heating system is state two in adaptive learning, record is each
Start the temperature T2 detected by leaving water temperature sensors (4) after preheating, and being averaged for T2 is calculated according to the number of times of pipeline start up by preheating
Value, if the average value is compared with T1, when fluctuating more than or equal to 2, is then set to state one by adaptive learning.
9. self study pre-heating mean according to claim 3, it is characterised in that the self study pre-heating mean also includes,
After preheating function on, if the temperature that leaving water temperature sensors (4) are detected is more than 66 DEG C for continuous 3 seconds, or water pump (1) is continuously
Operating stops preheating function, and the water pump that shuts down (1) more than 20 minutes, then.
10. self study pre-heating mean according to claim 3, it is characterised in that the span of a be 0.4≤a≤
0.6, T0=5 DEG C, M=5K.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107990560A (en) * | 2017-12-01 | 2018-05-04 | 广东万家乐燃气具有限公司 | Water heater pre-heating mean and water heater |
| CN108679848A (en) * | 2018-03-01 | 2018-10-19 | 万家乐热能科技有限公司 | A kind of the flow property judgment method and gas-heating water heater of hot-water supply |
| CN110017531A (en) * | 2019-04-10 | 2019-07-16 | 刘萍萍 | A kind of home-use hot water line's water recovery apparatus |
| CN110274301A (en) * | 2018-03-14 | 2019-09-24 | 东莞市三临机电有限公司 | A kind of energy-saving and environment-friendly hot-water supply device |
| CN111174444A (en) * | 2020-02-25 | 2020-05-19 | 华帝股份有限公司 | Control method for intelligent preheating of zero-cold-water heater |
| CN111397216A (en) * | 2020-03-25 | 2020-07-10 | 广东万和新电气股份有限公司 | Zero-cold-water control method and device for water heater, water heater and computer equipment |
| CN111561786A (en) * | 2020-04-03 | 2020-08-21 | 华帝股份有限公司 | Preheating control method of zero-cold-water gas water heater |
| CN112197439A (en) * | 2020-10-09 | 2021-01-08 | 珠海格力电器股份有限公司 | Gas water heater control method, device and system and gas water heater |
| CN112228592A (en) * | 2020-09-29 | 2021-01-15 | 宁波方太厨具有限公司 | Check valve and gas water heater system comprising same |
| CN113503646A (en) * | 2021-08-19 | 2021-10-15 | 华帝股份有限公司 | Control method of gas water heater and gas water heater |
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