CN102853546A - Water heater and control method thereof - Google Patents
Water heater and control method thereof Download PDFInfo
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- CN102853546A CN102853546A CN2011101836430A CN201110183643A CN102853546A CN 102853546 A CN102853546 A CN 102853546A CN 2011101836430 A CN2011101836430 A CN 2011101836430A CN 201110183643 A CN201110183643 A CN 201110183643A CN 102853546 A CN102853546 A CN 102853546A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 698
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000003020 moisturizing effect Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
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Abstract
The invention discloses a water heater and a control method thereof. This water heater includes: the water level switch group is arranged in a water tank of the water heater and comprises at least four water level switches which are respectively arranged at different heights, when the water heater works, two water level switches of the at least four water level switches are in an open state, and the rest water level switches of the at least four water level switches are in a closed state; and the controller is connected with the water level switch group and used for judging whether the two water level switches in the opening state have faults or not, and when any one of the two water level switches in the opening state has faults, the controller controls the two water level switches in the opening state to be closed and simultaneously controls any two water level switches in the closing state to be opened.
Description
Technical field
The present invention relates to the hot water machine field, in particular to a kind of hot water machine and control method thereof.
Background technology
At present, because the water level switch long period of soaking of air-source heat pump hot water breaks down in hot water easily, in case water level switch breaks down, hot water machine is just shut down, and can't remain in operation.
Problem for hot water machine in the correlation technique breaks down and occurs shutting down because of water level switch easily not yet proposes effective solution at present.
Summary of the invention
Main purpose of the present invention is to provide a kind of hot water machine and control method thereof, to solve the problem that hot water machine breaks down and occurs shutting down because of water level switch easily in the correlation technique.
To achieve these goals, according to an aspect of the present invention, provide a kind of hot water machine.
Hot water machine according to the present invention comprises: the water level switch group, be arranged in the water tank of hot water machine, comprise at least four water level switches that are separately positioned on differing heights, when hot water machine is worked, two water level switches at least four water level switches are in opening, and all the other water level switches at least four water level switches are in closed condition; And controller, be connected with the water level switch group, be used for judging whether two water level switches that are in opening break down, when any one water level switch that is in opening breaks down, control is in two water level switches of opening closes, and simultaneously control is in any two water level switches of closed condition and opens.
Further, water level switch sends into the water signal for the water level according to water tank or stops into the water signal, the water level that the water inlet signal is used to indicate water tank is lower than the position of water level switch, stops to be greater than or equal to into the water level that the water signal is used to indicate water tank the position of water level switch; And controller also is used for according to the water inlet signal and stops to judge into the water signal whether water level switch exists the water level switch that breaks down.
Further, controller also is used for the first water level switch when at least four water level switches and sends into water signal and the second water level switch and send when stopping into the water signal, judge that the first water level switch and/or the second water level switch break down, wherein, the first water level switch and the second water level switch are in opening simultaneously, and the position of the first water level switch is lower than the position of the second water level switch.
Further, controller also is used for stopping to begin timing into the water signal when the first water level switch sends to send into water signal and the second water level switch, when exceed the Preset Time scope signal duration, judge that the first water level switch and/or the second water level switch break down.
Further, controller also is used for according to the water inlet signal and stops into the water signal, and the control hot water machine is intake or stopped into water.
Further, controller also is used at least when the 3rd water level switch of four water level switches sends into the water signal with the 4th water level switch simultaneously, and the control hot water machine is intake; When the 3rd water level switch sends when stopping to send into the water signal into water signal and the 4th water level switch the water inlet of control hot water machine; And send simultaneously when stopping into the water signal when the 3rd water level switch and the 4th water level switch, the control hot water machine stops into water, wherein, the 3rd water level switch and the 4th switch are in opening simultaneously, and the position of the 3rd water level switch is lower than the position of the 4th water level switch.
Further, the water level switch group comprises the 5th water level switch that sets gradually from low to high, the 6th water level switch, the 7th water level switch and the 8th water level switch, wherein, when the aquifer yield of hot water machine be hot water machine the storing water in water tank amount 100% the time, any one water level switch and the 8th water level switch in the 5th water level switch, the 6th water level switch and the 7th water level switch are in opening simultaneously; When the aquifer yield of hot water machine be hot water machine the storing water in water tank amount 75% the time, any one water level switch and the 7th water level switch in the 5th water level switch or the 6th water level switch are in opening simultaneously; And when the aquifer yield of hot water machine be hot water machine the storing water in water tank amount 50% the time, the 5th water level switch and the 6th water level switch are in opening simultaneously.
Further, the water level switch group comprises the first float, the second float, the 3rd float and the 4th float that sets gradually from low to high.
To achieve these goals, according to a further aspect in the invention, provide a kind of control method of hot water machine.
Control method according to hot water machine of the present invention comprises: when any two water level switches are in opening in the water level switch group, judge whether two water level switches break down; When any one water level switch breaks down in two water level switches, controlling two water level switches closes and controls simultaneously all the other any two water level switches and open, wherein, the water level switch group is arranged in the water tank of hot water machine, and the water level switch group comprises at least four water level switches that are arranged on differing heights.
Further, when the water level of water tank was lower than the position of water level switch, water level switch sent into the water signal, and when the water level of water tank was greater than or equal to the position of water level switch, water level switch sent and stops into the water signal; And according to water inlet signal and stop to judge into the water signal whether water level switch breaks down.
Further, when sending into water signal and the second water level switch, sends when stopping into the water signal the first water level switch at least four water level switches, judge that the first water level switch and/or the second water level switch break down, wherein, the first water level switch and the second water level switch are in opening simultaneously, and the position of the first water level switch is lower than the position of the second water level switch.
Further, stop into the water signal and when exceeding the Preset Time scope, judge that the first water level switch and/or the second water level switch break down when the first water level switch sends to send into water signal and the second water level switch.
Further, according to water inlet signal and stopping into the water signal, control hot water machine water inlet or stop into water.
Further, when the 3rd water level switch at least four water level switches and the 4th water level switch send into the water signal simultaneously, the water inlet of control hot water machine; When the 3rd water level switch sends when stopping to send into the water signal into water signal and the 4th water level switch the water inlet of control hot water machine; And send simultaneously when stopping into the water signal when the 3rd water level switch and the 4th water level switch, the water tank of control hot water machine stops into water, wherein, the 3rd water level switch and the 4th switch are in opening simultaneously, and the position of the 3rd water level switch is lower than the position of the 4th water level switch.
By the present invention, employing comprises the hot water machine of following part: the water level switch group, be arranged in the water tank of hot water machine, comprise at least four water level switches that are separately positioned on differing heights, when hot water machine is worked, two water level switches at least four water level switches are in opening, and all the other water level switches at least four water level switches are in closed condition; And controller; be connected with the water level switch group; be used for judging whether two water level switches that are in opening break down; when two water level switches that are in opening break down; control is in two water level switches of opening and closes; simultaneously control is in any two water level switches of closed condition and opens; solve the problem that hot water machine breaks down and occurs shutting down because of water level switch easily in the correlation technique, reached the effect that prevents that hot water machine from breaking down and shutting down easily because of water level switch.
Description of drawings
The accompanying drawing that consists of the application's a part is used to provide a further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the block diagram according to the hot water machine of the embodiment of the invention;
Fig. 2 is the schematic diagram according to the float of the hot water machine of the embodiment of the invention;
Fig. 3 is the operational flow diagram according to the hot water machine of the embodiment of the invention; And
Fig. 4 is the flow chart according to the control method of the hot water machine of the embodiment of the invention.
The specific embodiment
Need to prove that in the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
Fig. 1 is the block diagram according to the hot water machine of the embodiment of the invention.As shown in Figure 1, this hot water machine comprises water level switch group 10, be arranged in the water tank of hot water machine, comprise at least four water level switches that are separately positioned on differing heights, when hot water machine is worked, two water level switches at least four water level switches are in opening, and all the other water level switches at least four water level switches are in closed condition; And controller 20, be connected with water level switch group 10, be used for judging whether two water level switches that are in opening break down, when any one water level switch breaks down in two water level switches that are in opening, control is in two water level switches of opening closes, and simultaneously control is in any two water level switches of closed condition and opens.
By comprise the water level switch group 10 of a plurality of water level switches in the hot water machine setting, so that hot water machine is enabled alternative water level switch when water level switch breaks down; By controller 20 is set at hot water machine; so that hot water machine is opened other water level switches automatically when water level switch breaks down; therefore; adopt the hot water machine of this embodiment; unless all water level switches of water level switch group all break down; water level switch does not break down and frequent phenomenon of shutting down easily otherwise hot water machine can not occur, so that hot water machine is difficult for shutting down because of the water level switch fault.
In addition, a plurality of water level switches are separately positioned on differing heights, the water level switch of opening is not simultaneously, the moisture storage capacity of the water tank of hot water machine is different, and correspondingly, the heat time heating time of hot water machine is also different, therefore, adopt the hot water machine of this embodiment, the user can select different water level switches according to water requirement and heat time heating time, so that the user is convenient when using hot water machine.
Preferably, water level switch sends into the water signal for the water level according to water tank or stops into the water signal, the water level that the water inlet signal is used to indicate water tank is lower than the position of water level switch, stops to be greater than or equal to into the water level that the water signal is used to indicate water tank the position of water level switch; And controller also is used for according to the water inlet signal and stops to judge into the water signal whether water level switch exists the water level switch that breaks down, and the control hot water machine is intake or stopped into water.
Water level switch is actually a sensor, detect in real time the water level of water tank, and sending different signals according to water level from the position of water level switch, the signal that controller sends jointly according to two in running order water level switches judges whether water level switch has problems and control the hot water machine moisturizing.A water level switch in two in running order water level switches is positioned at high water level, a water level switch is positioned at middle water level, in the middle of water level switch when detecting water level and being lower than its present position, then signal is reached controller, the water inlet of control water inlet, when the high water level switch detects water level and is higher than its present position, then control water inlet and stop into water.
In the middle of water level switch send into water signal and high water level switch and send when stopping into the water signal, to the eye, the water level of expression water tank is lower than middle water level and is higher than high water level, in fact, this phenomenon is impossible exist, and controller just can be judged the water level switch that has damage in two water level switches; When middle water level switch and high water level switch sent into the water signal simultaneously, the water level of expression water tank was lower than middle water level, and hot water machine need be intake; In the middle of water level switch send when stopping to send into the water signal into water signal and high water level switch, the water level of expression water tank is higher than middle water level but is lower than high water level, hot water machine is intake; And central water level switch and high water level switch send when stopping into the water signal simultaneously, and the water level of expression water tank has been higher than high water level, and hot water machine need stop into water.Judge by the signal that water level switch sends whether hot water machine breaks down, in real time accurately.
Preferably, for preventing causing the erroneous judgement of controller disconnected owing to the error signal of water level switch, in the middle of water level switch send to send into water signal and high water level switch and stop to begin timing into the water signal, when exceed the Preset Time scope signal duration, controller is just judged has the fault water level switch to exist in two water level switches, because time-delay or other reasons are accidental when sending error signal, controller is not determined fault immediately when water level switch.Error signal is inevitable to disappear within a period of time, so controller is not done the conversion of water level switch, still adopted current water level switch operation.
Fig. 2 is the schematic diagram according to the water-level float of the hot water machine of the embodiment of the invention, as shown in the figure, is provided with respectively the first float, the second float, the 3rd float and the 4th float from low to high four water level positions.When the aquifer yield of hot water machine be hot water machine the storing water in water tank amount 100% the time, any one float and the 4th float in the first float, the second float and the 3rd float are in opening simultaneously; When the aquifer yield of hot water machine be hot water machine the storing water in water tank amount 75% the time, any one float and the 3rd float in the first float or the second float are in opening simultaneously; And when the aquifer yield of hot water machine be hot water machine the storing water in water tank amount 50% the time, the first float and the second float are in opening simultaneously, select water level pattern corresponding to different floats, as shown in the table, adopt 4 sections water level switches, two floats are one group of water level pattern, can 6 kinds of patterns of Set arbitrarily, be respectively 1., 2., 3., 4., 5., 6., the acquiescence period is for 2..Middle water level is that unit begins the directly-heated moisturizing, and high water level is for stopping moisturizing, and namely high water level is final aquifer yield.
3 pairs of water level patterns in correspondence with each other:
When running on pattern water-level float 1. and break down, be converted to pattern 6.; When running on pattern water-level float 2. and break down, be converted to pattern 5.; When running on pattern water-level float 3. and break down, be converted to pattern 3..
If the signal definition of will intaking is ON, when stopping being OFF into the water signal definition: be OFF when detecting the high water level signal, when the middle water level signal is ON, just controller can judge that water level switch breaks down; When the high water level signal is ON, the middle water level signal represents when being OFF that water tank is in into the water state; When the high water level signal is OFF, the middle water level signal represents to have contained in the water tank water of demand when being OFF; When being ON, the expression quantity of water in water tank is very few, needs the beginning moisturizing.
Fig. 3 is the operational flow diagram according to the hot water machine of the embodiment of the invention, as shown in Figure 3, compressor emergency shutdown after detecting water level fault (that is: high water level OFF and middle water level ON), by as judge:
If the water level fault recovery is normal in the A 10min, then unit is still by former designated water level mode detection operation;
If the water level fault is not recovered normally in the B 10min, then the water level pattern is converted to corresponding water level pattern automatically, and unit detects operation again.
Particularly, if the water level pattern is set for 2., unit normally moves; Be the OFF signal when detecting the 4th float (high water level), and the second float (middle water level) is the ON signal, unit newspaper water level abnormality fault then; If water level switch is still unusual in the 10min, then 5. 2. the water level pattern change corresponding water level pattern over to, and unit detects the 3rd float (high water level) and the first float (middle water level) operation again; If water level switch recovers normal in the 10min, then still detect the water level pattern of current setting and 2. move.Adopt the hot water machine of this embodiment, after unit detects the water level fault, avoided the situation of direct shutdown, but by adaptive processing, make unit detect the operation that corresponding water level pattern continues to keep unit, satisfy the requirement of user's water.Preferably, manually the designated water level pattern is carried out the setting of demand aquifer yield, thereby has namely given a piece of bad advice 2 water-level floats, still can manually set available water level pattern, guarantees the water heating operation of unit.
To achieve these goals, according to a further aspect in the invention, provide a kind of control method of hot water machine.
Fig. 4 is the flow chart according to the control method of the hot water machine of the embodiment of the invention, as shown in Figure 4, comprises step S102 to S110 according to the control method of hot water machine of the present invention.
Step S102 selects to open two water level switches.At first in the water level switch group, select any two water level switches to be in opening, the hot water machine operation, the water level switch group is arranged in the water tank of hot water machine, and the water level switch group comprises at least four water level switches that are arranged on differing heights.
Step S104 judges whether two water level switches break down.In the process of hot water machine operation, detect in real time two water level switches and whether break down, when two water level switches break down, execution in step S106, otherwise execution in step S108.
Step S106 controls two water level switches and closes.Break down in case detect two water level switches, two water level switches are closed.
The method of detection failure comprises: when the water level of water tank is lower than the position of water level switch, water level switch sends into the water signal, when the water level of water tank is greater than or equal to the position of water level switch, water level switch sends and stops into the water signal, according to water inlet signal and stop to judge into the water signal whether water level switch breaks down.
Particularly, open two one of water level switches and be in middle water level, another is in high water level, and central water level switch sends into water signal and high water level switch and sends when stopping into the water signal, judges that water level switch breaks down.Preferably, when fault continues Preset Time, again two water level switches are closed, can that fault is made erroneous judgement be not disconnected owing to the error signal of water level switch, so that fault is determined is more accurate.
Step S108 controls the hot water machine moisturizing or stops moisturizing.When two water level switch normal operations, control the hot water machine moisturizing or stop moisturizing.
Control hot water machine moisturizing or the method that stops moisturizing comprising: further, when central water level switch and high water level switch sent into the water signal simultaneously, the control hot water machine was intake; In the middle of water level switch send when stopping to send into the water signal into water signal and high water level switch the water inlet of control hot water machine; And central water level switch and high water level switch send when stopping into the water signal simultaneously, and the water tank of control hot water machine stops into water.
Step S110 controls all the other any two water level switches and opens.After judging that two water level switches break down, it is closed, and then open all the other any two water level switches, guarantee that hot water machine can owing to the water level switch fault is shut down, not continue to rely on remaining water level switch operation.
Adopt the control method of the hot water machine of this embodiment, can detect in real time the running status of hot water machine middle water level switch, when the water level switch normal operation, control hot water machine moisturizing or stop moisturizing according to its water level signal of sending; When the water level switch operation exception, need not to shut down, only the water level switch of fault is closed, open other any two water level switches, so that hot water machine can be owing to water level switch is easily sent out fault and often shutdown.
From above description; can find out; the hot water machine of the embodiment of the invention has been realized following technique effect: adopt comprise a plurality of water level switches the water level switch group; so that hot water machine is not shut down when water level switch breaks down; but the water level switch of closing fault, the while is opened other water level switch automatically.Therefore, unless all water level switches of water level switch group all break down, water level switch does not break down and frequent phenomenon of shutting down easily otherwise hot water machine can not occur, so that hot water machine is difficult for shutting down.In addition, a plurality of water level switches are separately positioned on differing heights, so that the user is convenient when using hot water machine.
Need to prove, can in the computer system such as one group of computer executable instructions, carry out in the step shown in the flow chart of accompanying drawing, and, although there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. a hot water machine is characterized in that, comprising:
The water level switch group, be arranged in the water tank of described hot water machine, comprise at least four water level switches that are separately positioned on differing heights, when described hot water machine work, two water level switches in described at least four water level switches are in opening, and all the other water level switches in described at least four water level switches are in closed condition; And
Controller, be connected with described water level switch group, be used for judging whether two water level switches that are in opening break down, when described any one water level switch that is in opening breaks down, control the described water level switch that is in opening and close, simultaneously control is in any two water level switches of closed condition and opens.
2. hot water machine according to claim 1 is characterized in that,
Described water level switch sends into the water signal for the water level according to described water tank or stops into the water signal, the water level that described water inlet signal is used to indicate described water tank is lower than the position of described water level switch, the described position that stops to be greater than or equal to into the water level that the water signal is used to indicate described water tank described water level switch; And
Described controller also is used for judging into the water signal whether described water level switch exists the water level switch that breaks down according to described water inlet signal and described stopping.
3. hot water machine according to claim 2 is characterized in that,
Described controller also is used for the first water level switch when described at least four water level switches and sends into water signal and the second water level switch and send when stopping into the water signal, judge that described the first water level switch and/or described the second water level switch break down, wherein, described the first water level switch and described the second water level switch are in opening simultaneously, and the position of described the first water level switch is lower than the position of described the second water level switch.
4. hot water machine according to claim 3 is characterized in that,
Described controller also is used for stopping to begin timing into the water signal when described the first water level switch sends to send into water signal and described the second water level switch, when exceed the Preset Time scope signal duration, judge that described the first water level switch and/or described the second water level switch break down.
5. hot water machine according to claim 2 is characterized in that, described controller also is used for according to described water inlet signal and described stopping into the water signal, controls described hot water machine water inlet or stops into water.
6. hot water machine according to claim 5 is characterized in that, described controller also is used for:
When the 3rd water level switch in described at least four water level switches and the 4th water level switch send into the water signal simultaneously, control described hot water machine water inlet;
When described the 3rd water level switch sends when stopping to send into the water signal into water signal and described the 4th water level switch, control described hot water machine water inlet; And
When described the 3rd water level switch and described the 4th water level switch send when stopping into the water signal simultaneously, control described hot water machine and stop into water,
Wherein, described the 3rd water level switch and described the 4th switch are in opening simultaneously, and the position of described the 3rd water level switch is lower than the position of described the 4th water level switch.
7. hot water machine according to claim 1 is characterized in that, described water level switch group comprises the 5th water level switch that sets gradually from low to high, the 6th water level switch, and the 7th water level switch and the 8th water level switch, wherein,
When the aquifer yield of described hot water machine be described hot water machine the storing water in water tank amount 100% the time, any one water level switch and described the 8th water level switch in described the 5th water level switch, described the 6th water level switch and described the 7th water level switch are in opening simultaneously;
When the aquifer yield of described hot water machine be described hot water machine the storing water in water tank amount 75% the time, any one water level switch and described the 7th water level switch in described the 5th water level switch or described the 6th water level switch are in opening simultaneously; And
When the aquifer yield of described hot water machine be described hot water machine the storing water in water tank amount 50% the time, described the 5th water level switch and described the 6th water level switch are in opening simultaneously.
8. hot water machine according to claim 1 is characterized in that, described water level switch group comprises the first float, the second float, the 3rd float and the 4th float that sets gradually from low to high.
9. the control method of a hot water machine is characterized in that, comprising:
When any two water level switches are in opening in the water level switch group, judge whether described two water level switches break down;
When any one water level switch breaks down in described two water level switches, controlling described two water level switches closes and controls simultaneously all the other any two water level switches and open, wherein, described water level switch group is arranged in the water tank of described hot water machine, and described water level switch group comprises at least four water level switches that are arranged on differing heights.
10. the control method of hot water machine according to claim 9 is characterized in that,
When the water level of described water tank was lower than the position of described water level switch, described water level switch sent into the water signal, and when the water level of described water tank was greater than or equal to the position of described water level switch, described water level switch sent and stops into the water signal; And
Judge into the water signal whether described water level switch breaks down according to described water inlet signal and described stopping.
11. the control method of hot water machine according to claim 10 is characterized in that,
When sending into water signal and the second water level switch, sends when stopping into the water signal the first water level switch in described at least four water level switches, judge that described the first water level switch and/or described the second water level switch break down, wherein, described the first water level switch and described the second water level switch are in opening simultaneously, and the position of described the first water level switch is lower than the position of described the second water level switch.
12. the control method of hot water machine according to claim 11 is characterized in that,
Stop into the water signal and when exceeding the Preset Time scope, judge that described the first water level switch and/or described the second water level switch break down when described the first water level switch sends to send into water signal and described the second water level switch.
13. the control method of hot water machine according to claim 10 is characterized in that,
According to described water inlet signal and described stopping into the water signal, control the water inlet of described hot water machine or stop into water.
14. the control method of hot water machine according to claim 13 is characterized in that,
When the 3rd water level switch in described at least four water level switches and the 4th water level switch send into the water signal simultaneously, control described hot water machine water inlet;
When described the 3rd water level switch sends when stopping to send into the water signal into water signal and described the 4th water level switch, control described hot water machine water inlet; And
When described the 3rd water level switch and described the 4th water level switch send when stopping into the water signal simultaneously, the water tank of controlling described hot water machine stops into water,
Wherein, described the 3rd water level switch and described the 4th switch are in opening simultaneously, and the position of described the 3rd water level switch is lower than the position of described the 4th water level switch.
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| CN104061686A (en) * | 2013-03-22 | 2014-09-24 | 广东美的暖通设备有限公司 | Water heater and control method thereof |
| CN104655234A (en) * | 2013-11-25 | 2015-05-27 | 珠海格力电器股份有限公司 | Water heater water level detection processing method and device and water heater |
| CN105004063A (en) * | 2015-07-21 | 2015-10-28 | 珠海格力电器股份有限公司 | Water supplementing control method and device and water heater |
| CN106196619A (en) * | 2016-06-29 | 2016-12-07 | 宁波奥克斯电气股份有限公司 | Hot water machine water level control method of water tank |
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| CN114253188A (en) * | 2021-12-10 | 2022-03-29 | 中国电建集团中南勘测设计研究院有限公司 | Control system and method for rural sewage treatment equipment |
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