CN115717761A - Control method for comfortable air of multi-split air conditioner - Google Patents
Control method for comfortable air of multi-split air conditioner Download PDFInfo
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- CN115717761A CN115717761A CN202211421217.0A CN202211421217A CN115717761A CN 115717761 A CN115717761 A CN 115717761A CN 202211421217 A CN202211421217 A CN 202211421217A CN 115717761 A CN115717761 A CN 115717761A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a control method of comfortable air of a multi-split air conditioner, which is characterized in that the control method of a refrigerating comfortable air mode of an indoor unit meeting an entering condition is carried out, low-pressure target pressure is adjusted according to different entering conditions, the temperature of the middle part of any flow path of a heat exchange of the indoor unit is detected at regular intervals, if the continuous A time of the temperature of the middle part of any flow path of the heat exchange of the indoor unit is lower than 14 ℃, the superheat degree is increased by 1 ℃ on the basis of the existing superheat degree, if the continuous A time of the temperature of the middle part of any flow path of the heat exchange of the indoor unit is higher than 16 ℃, the superheat degree is decreased by 1 ℃ on the basis of the existing superheat degree, and if the continuous A time of the temperature of the middle part of any flow path of the heat exchange of the indoor unit is 14-16 ℃, the superheat degree is kept unchanged. Under the refrigeration working condition, the temperature control of the multi-split air conditioner under different starting capacities and different starting modes is realized, and not only can the user needing comfortable air be met, but also the user needing quick refrigeration can be met.
Description
Technical Field
The invention relates to the technical field of multi-split air conditioners, in particular to a method for controlling comfortable air of a multi-split air conditioner.
Background
At present, most of multi-split air conditioners are correspondingly controlled in the aspect of quick refrigeration, and cannot independently control different internal machines, so that the refrigeration requirements of different users cannot be met. Most of the multi-split air conditioners at present have poor user experience effect due to large air outlet quantity, low temperature control and low comfort.
Disclosure of Invention
The invention provides a method for controlling comfortable air of a multi-split air conditioner, which aims to solve the problem that the comfortable air cannot be independently controlled among different internal units of the existing multi-split air conditioner.
The invention provides a control method of comfortable air of a multi-split air conditioner, which is characterized in that the control method of a refrigerating comfortable air mode of an indoor unit meeting the entering conditions is carried out, the low-pressure target pressure is adjusted according to different entering conditions, the temperature of the middle part of any flow path of the heat exchange of the indoor unit is detected at regular intervals, if the continuous A time of the temperature of the middle part of any flow path of the heat exchange of the indoor unit is lower than 14 ℃, the superheat degree is increased by 1 ℃ on the basis of the existing superheat degree, if the continuous A time of the temperature of the middle part of any flow path of the heat exchange of the indoor unit is higher than 16 ℃, the superheat degree is decreased by 1 ℃ on the basis of the existing superheat degree, if the continuous A time of the temperature of the middle part of any flow path of the heat exchange of the indoor unit is 14-16 ℃, the superheat degree is kept unchanged, the initial set value of the superheat degree is 4 ℃, the minimum superheat degree is 3 ℃, and the maximum temperature is 6 ℃.
Preferably, the entry conditions are four, respectively:
entry condition (1): the sum of the rated refrigerating capacity of the indoor unit of the starting machine in the refrigerating comfortable air mode and the rated refrigerating capacity of the indoor unit of the starting machine in the normal refrigerating mode is less than 50 percent of the refrigerating capacity of the outdoor unit;
entry condition (2): meanwhile, (2.1) the rated refrigerating capacity of the indoor unit is less than 50% of the refrigerating capacity of the outdoor unit when the indoor unit is started in the refrigerating comfortable air mode; (2.2) the difference value between the return air inlet temperature of all the internal machines of the starting machine and the set target temperature is not more than 1 ℃;
entry condition (3): the sum of the rated refrigerating capacity of the indoor unit when the air conditioner is started in the refrigerating comfortable air mode and the rated refrigerating capacity of the indoor unit when the air conditioner is started in the normal refrigerating mode is more than or equal to 50 percent of the refrigerating capacity of the outdoor unit;
entry condition (4): meanwhile, (4.1) the rated refrigerating capacity of the indoor unit is more than or equal to 50% of the refrigerating capacity of the outdoor unit when the air conditioner is started in a refrigerating comfortable air mode; (4.2) the difference value between the return air inlet temperature of all the internal machines with the starting machine and the set target temperature is not more than 1 ℃.
Preferably, the air conditioner satisfying the entry condition (1) and the entry condition (3) has a target low-pressure of 0.75Mpa.
Preferably, the entering condition (2) is satisfied, the low-pressure target pressure is adjusted by the wind speed, if the wind speed is high wind, the low-pressure target pressure is 0.98Mpa, if the wind speed is medium wind, the low-pressure target pressure is 1Mpa, and if the wind speed is low wind, the low-pressure target pressure is 1.02Mpa; for indoor units with different capacities, the rotating speed range of the low wind speed indoor unit is 345-370rpm, the rotating speed range of the medium wind speed indoor unit is 390-400rpm, and the rotating speed range of the high wind speed indoor unit is 435-450rpm.
Preferably, the entry condition (4) is satisfied, the low-pressure target pressure is adjusted by the wind speed, if the wind speed is high wind, the low-pressure target pressure is 0.96Mpa, if the wind speed is medium wind, the low-pressure target pressure is 0.98Mpa, and if the wind speed is low wind, the low-pressure target pressure is 1Mpa; for indoor units with different capacities, the rotating speed range of the low wind speed indoor unit is 345-370rpm, the rotating speed range of the medium wind speed indoor unit is 390-400rpm, and the rotating speed range of the high wind speed indoor unit is 435-450rpm.
Preferably, if the wind speeds of the internal machines in the starting machine are different, the control is carried out according to a low-pressure target pressure value corresponding to the lowest wind speed.
Preferably, if the temperature of the middle part of any flow path of the indoor unit heat exchange or the temperature of the indoor unit heat exchange inlet reaches the anti-freezing temperature, the superheat degree is immediately adjusted to 4 ℃.
Preferably, the exit condition of the cooling comfortable air mode is that if the difference between the temperature of the air return port and the set target temperature of the cooling comfortable air mode internal unit is greater than 2 ℃, the starting internal unit of the cooling comfortable air mode performs normal cooling control.
Compared with the prior art, the invention has the beneficial effects that: the invention realizes the temperature control of the multi-split air conditioner under different starting capacities and different starting modes under the refrigeration working condition, and can meet the requirements of users needing comfortable air and users needing quick refrigeration.
Drawings
FIG. 1 is a schematic diagram of detecting the temperature of the middle part of any flow path of the heat exchanger of the indoor unit;
FIG. 2 is a schematic diagram of a temperature detection structure for heat exchange installation of an indoor unit;
fig. 3 is a schematic view showing the connection between the temperature sensing sleeve and the elbow.
The figure is marked with: temperature sensing sleeve 1, temperature sensor 2, clip 3, elbow 4, refrigerant pipe 5.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment provides a method for controlling comfortable air of a multi-split air conditioner, which comprises the following steps:
firstly, it is determined which entry condition is satisfied by the cooling comfort wind mode, and there are four entry conditions in this embodiment:
(1) The sum of the rated refrigerating capacity of the indoor unit started in the refrigerating comfortable air mode and the rated refrigerating capacity of the indoor unit started in the normal refrigerating mode is less than 50% of the refrigerating capacity of the outdoor unit.
(2) Meanwhile, (2.1) the rated refrigerating capacity of the indoor unit is less than 50% of the refrigerating capacity of the outdoor unit when the indoor unit is started in the refrigerating comfortable air mode; (2.2) the difference value between the return air inlet temperature of all the internal machines of the starting machine and the set target temperature is not more than 1 ℃.
(3) The sum of the rated refrigerating capacity of the indoor unit started in the refrigerating comfortable air mode and the rated refrigerating capacity of the indoor unit started in the normal refrigerating mode is more than or equal to 50% of the refrigerating capacity of the outdoor unit.
(4) Meanwhile, (4.1) the refrigerating comfortable air mode is met, and the rated refrigerating capacity of the internal unit is more than or equal to 50% of the refrigerating capacity of the external unit when the air conditioner is started; (4.2) the difference value between the return air inlet temperature of all the internal machines of the starting machine and the set target temperature is not more than 1 ℃.
The above entry conditions are exemplified below:
for example: the outdoor unit model is RFC100TX, the refrigerating capacity of the outdoor unit model is 10KW, indoor unit matching can be performed according to 100%, and the matching machine models are RFUS22X 1 (rated refrigerating capacity of 2.2 KW), RFUS25X 2 (rated refrigerating capacity of 2.5 KW) and RFUS28X 1 (rated refrigerating capacity of 2.8 KW).
If one model of RFUS22X is started in the cooling comfort wind mode and one model of RFUS25X is in the normal cooling mode, the total starting capacity is 2.2+2.5=4.7kw, and the capacity ratio is less than 50% (4.7/10 + 100% = 47%), then the entry condition (1) is satisfied.
If one model of RFUS22X is set as a refrigerating comfortable air mode and one model of RFUS25X is set as a refrigerating comfortable air mode, the total starting capacity is 2.2+2.5=4.7KW, the capacity ratio is less than 50% (4.7/10 + 100% = 47%), the entering condition (2.1) is met, then the difference between the return air inlet temperature of the RFUS22X and the return air inlet temperature of the RFUS25X and the set target temperature is not more than 1 ℃, the entering condition (2.2) is met, and the entering condition (2) is met if the two conditions are met simultaneously.
If one model of RFUS22X is started to be in a cooling comfortable air mode, and two models of RFUS25X are in a normal cooling mode, the total starting capacity is 2.2+2.5= 7.2KW, the capacity ratio is greater than 50% (7.2/10 + 100% = 72%), and the entering condition (3) is met.
If one RFUS22X machine model is in a refrigerating comfortable air mode, and two RFUS25X machines are in refrigerating comfortable air modes, the total starting capacity is 2.2+2.5= 7.2KW, the capacity ratio is larger than 50% (7.2/10 + 100% = 72%), the entering condition (4.1) is met, then the difference between the return air inlet temperature of one RFUS22X machine model and the return air inlet temperature of the two RFUS25X machines and the set target temperature is not larger than 1 ℃, the entering condition (4.2) is met, and the entering condition (4) is met if the two conditions are met simultaneously.
Then, if the condition (1) is judged to be satisfied, the EEV control method is started:
the method comprises the steps that low-pressure target pressure of all indoor units of the starting-up machine is normally controlled, the pressure is 0.75Mpa, normal refrigeration mode control of the indoor units in a normal refrigeration mode is set, the indoor units in a refrigeration comfortable air mode firstly detect whether the difference between the temperature of a return air inlet and the set target temperature is not more than 1 ℃, if the difference meets the condition, the superheat degree of 4 ℃ is used as an initial set value to control an Electronic Expansion Valve (EEV), after 5min, the superheat degree is adjusted through the middle temperature of any flow path of the heat exchange of the indoor units, wherein the superheat degree = the middle temperature of any flow path of the heat exchange of the indoor units-the temperature of the heat exchange of the indoor units, the middle temperature of any flow path of the heat exchange of the indoor units is lower than 14 ℃, the superheat degree is increased by 1 ℃ on the basis of the existing superheat degree, the middle temperature of any flow path of the heat exchange of the indoor units is higher than 16 ℃ on the basis of the continuous 5min, the superheat degree of the indoor units is reduced by 1 ℃, the middle temperature of any flow path of the heat exchange of the indoor units is between 14 ℃ and the superheat degree of the indoor units, and the superheat degree of superheat is unchanged. In addition, if the middle temperature of any flow path of the indoor unit heat exchange or the temperature of the indoor unit heat exchange inlet reaches the anti-freezing temperature of 2.5 ℃, the superheat degree is immediately adjusted to be 4 ℃, the opening degree of the electronic expansion valve is adjusted to be the opening degree when the superheat degree is 4 ℃, then the control is continued by the existing superheat degree, the highest value of the superheat degree cannot exceed 6 ℃, and the lowest value of the superheat degree cannot be lower than 3 ℃.
If the entry condition (2) is judged to be met, starting the following control method:
the wind speed is confirmed, if the wind speed is high wind (high wind + ultra high wind), the low pressure target pressure is adjusted to 0.98Mpa, if the wind speed is medium wind, the low pressure target pressure is adjusted to 1Mpa, if the wind speed is low wind (low wind + ultra low wind + silence), the low pressure target pressure is adjusted to 1.02Mpa, the normal control pressure of the low pressure target pressure in the embodiment is 0.75Mpa, and the pressure detection is the low pressure side comprehensive pressure of the whole refrigerant system, which is the pressure at the outlet of all the heat exchange indoor units. And if the wind speeds of all the internal machines are different, controlling according to the low-pressure target pressure corresponding to the lowest wind speed. For indoor units with different capacities, the rotating speed range of the low wind speed indoor unit is 345-370rpm, the rotating speed range of the medium wind speed indoor unit is 390-400rpm, and the rotating speed range of the high wind speed indoor unit is 435-450rpm.
The same EEV control method as for condition (1) is then initiated and entered:
the method comprises the steps that an inner machine in a refrigeration comfortable air mode is set, whether the difference between the temperature of a return air inlet and a set target temperature is not more than 1 ℃ is detected, if the difference between the temperature of the return air inlet and the set target temperature is not more than 1 ℃, the control of an Electronic Expansion Valve (EEV) is carried out by taking the superheat degree of 4 ℃ as an initial set value, the superheat degree is adjusted by the middle temperature of any flow path of the heat exchange of the inner machine after 5min, wherein the superheat degree = the middle temperature of any flow path of the heat exchange of the inner machine-the temperature of the heat exchange of the inner machine, the middle temperature of any flow path of the heat exchange of the inner machine is lower than 14 ℃ in 5min continuously, the superheat degree is increased by 1 ℃ on the basis of the existing superheat degree, the middle temperature of any flow path of the heat exchange of the inner machine is higher than 16 ℃, the superheat degree is decreased by 1 ℃ on the basis of the existing superheat degree, the middle temperature of any flow path of the heat exchange of the inner machine is 14-16 ℃, and the superheat degree is unchanged. In addition, if the middle temperature of any flow path of the indoor unit heat exchange or the temperature of the indoor unit heat exchange inlet reaches the anti-freezing temperature of 2.5 ℃, the superheat degree is immediately adjusted to be 4 ℃, the opening degree of the electronic expansion valve is adjusted to be the opening degree when the superheat degree is 4 ℃, then the control is continued by the existing superheat degree, the highest value of the superheat degree cannot exceed 6 ℃, and the lowest value of the superheat degree cannot be lower than 3 ℃.
If the entry condition (3) is determined to be satisfied, starting a control method the same as that of the entry condition (1), which is not described herein again.
If the entry condition (4) is judged to be met, starting a control method the same as the entry condition (2): first, the wind speed is confirmed, if the wind speed is high wind (high wind + ultra-high wind), the low pressure target pressure is adjusted to 0.96Mpa, if the wind speed is medium wind, the low pressure target pressure is adjusted to 0.98Mpa, if the wind speed is low wind (low wind + ultra-low wind + silence), the low pressure target pressure is adjusted to 1Mpa, in the embodiment, the normal control pressure of the low and medium pressure target pressure is 0.75Mpa, and the pressure detection is the pressure of the low pressure side comprehensive pressure of the whole refrigerant system, which is the pressure of the outlet gathering position of all indoor units. And if the wind speeds of all the startup internal machines are different, controlling according to the low-pressure target pressure corresponding to the lowest wind speed.
The subsequent EEV control method, which is the same as the entry condition (1), is performed, and is not described again.
In this embodiment, the exit conditions of the entry conditions (1), (2), (3), and (4) are that if the difference between the temperature of the air return port and the set target temperature is greater than 2 ℃, the internal machine of the refrigeration comfort air mode is normally controlled to perform refrigeration.
The superheat degree of the indoor unit controlled in the normal refrigeration mode is 3 ℃, the formula of the superheat degree is that the temperature of a total air pipe of the heat exchange of the indoor unit-the temperature of the middle part of any flow path of the heat exchange of the indoor unit =3 ℃, and the middle temperature of any flow path of the heat exchange of the indoor unit is collected as the position shown in fig. 3. Fig. 3 shows indoor set heat exchange, and fig. 1, 2 show that an application improves the device of temperature detection precision on heat exchange, including temperature sensing sleeve pipe 1, temperature sensor 2, clip 3, elbow 4 fixes on the refrigerant pipe 5 of heat exchange, temperature sensing sleeve pipe 1 welds on two elbows 4, temperature sensor 2 sets up inside temperature sensing sleeve pipe 1 to fix through clip 3. The inside face of temperature sensing sleeve pipe 1 can fully cooperate with temperature sensor 2, better detection temperature, and outside face welds with elbow 4, and because of the face of weld is the plane, then the temperature of elbow 4 can be better passes to temperature sensing sleeve pipe 1, and then temperature sensor 2 can the detection refrigerant temperature of higher accuracy.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A method for controlling comfortable air of a multi-split air conditioner is characterized by comprising the following steps: the method comprises the steps of carrying out refrigeration comfort air mode control on an indoor unit meeting the entering conditions, adjusting low-pressure target pressure according to different entering conditions, detecting the middle temperature of any flow path of the heat exchange of the indoor unit at regular intervals, if the continuous A time of the middle temperature of any flow path of the heat exchange of the indoor unit is lower than 14 ℃, adding 1 ℃ to the existing superheat degree, if the continuous A time of the middle temperature of any flow path of the heat exchange of the indoor unit is greater than 16 ℃, subtracting 1 ℃ from the existing superheat degree, if the continuous A time of the middle temperature of any flow path of the heat exchange of the indoor unit is 14-16 ℃, keeping the superheat degree unchanged, wherein the initial set value of the superheat degree is 4 ℃, and the superheat degree is 3 ℃ at the lowest and 6 ℃ at the highest.
2. The method as claimed in claim 1, wherein the entry conditions are four, respectively:
entry condition (1): the sum of the rated refrigerating capacity of the indoor unit of the starting machine in the refrigerating comfortable air mode and the rated refrigerating capacity of the indoor unit of the starting machine in the normal refrigerating mode is less than 50 percent of the refrigerating capacity of the outdoor unit;
entry condition (2): meanwhile, (2.1) the rated refrigerating capacity of the internal machine is less than 50% of the refrigerating capacity of the external machine when the machine is started in a refrigerating comfortable air mode; (2.2) the difference value between the return air inlet temperature of all the internal machines of the starting machine and the set target temperature is not more than 1 ℃;
entry condition (3): the sum of the rated refrigerating capacity of the indoor unit of the starting machine in the refrigerating comfortable air mode and the rated refrigerating capacity of the indoor unit of the starting machine in the normal refrigerating mode is more than or equal to 50 percent of the refrigerating capacity of the outdoor unit;
entry condition (4): meanwhile, (4.1) the refrigerating comfortable air mode is met, and the rated refrigerating capacity of the internal unit is more than or equal to 50% of the refrigerating capacity of the external unit when the air conditioner is started; (4.2) the difference value between the return air inlet temperature of all the internal machines of the starting machine and the set target temperature is not more than 1 ℃.
3. The multi-split air conditioner comfort air control method as claimed in claim 2, wherein: the air conditioner satisfying the entry condition (1) and the entry condition (3) has a target low-pressure of 0.75Mpa.
4. The multi-split air conditioner comfort air control method as claimed in claim 2, wherein: the method comprises the following steps of (1) meeting an entry condition (2), adjusting low-pressure target pressure through wind speed, wherein the low-pressure target pressure is 0.98Mpa if the wind speed is high wind, the low-pressure target pressure is 1Mpa if the wind speed is medium wind, and the low-pressure target pressure is 1.02Mpa if the wind speed is low wind; for indoor units with different capacities, the rotating speed range of the low wind speed indoor unit is 345-370rpm, the rotating speed range of the medium wind speed indoor unit is 390-400rpm, and the rotating speed range of the high wind speed indoor unit is 435-450rpm.
5. The method for controlling comfortable air of a multi-split air conditioner according to claim 2, wherein: the method comprises the following steps of (4) meeting an entering condition, adjusting low-pressure target pressure through wind speed, wherein the low-pressure target pressure is 0.96Mpa if the wind speed is high wind, the low-pressure target pressure is 0.98Mpa if the wind speed is medium wind, and the low-pressure target pressure is 1Mpa if the wind speed is low wind; for indoor units with different capacities, the rotating speed range of the low wind speed indoor unit is 345-370rpm, the rotating speed range of the medium wind speed indoor unit is 390-400rpm, and the rotating speed range of the high wind speed indoor unit is 435-450rpm.
6. The multi-split air conditioner comfort air control method as claimed in claim 4 or 5, wherein: and if the wind speeds of the internal machines in the starting machine are different, controlling according to a low-pressure target pressure value corresponding to the lowest wind speed.
7. The multi-split air conditioner comfort air control method as claimed in claim 1, wherein: and if the temperature of the middle part of any flow path of the indoor unit heat exchange or the temperature of the indoor unit heat exchange inlet reaches the anti-freezing temperature, immediately adjusting the superheat degree to be 4 ℃.
8. The method for controlling comfortable air of a multi-split air conditioner according to claim 1, wherein: the exit condition of the refrigerating comfortable air mode is that if the difference between the temperature of the air return port and the set target temperature of the refrigerating comfortable air mode internal unit is more than 2 ℃, the starting internal unit of the refrigerating comfortable air mode carries out normal refrigeration control.
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Citations (5)
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|---|---|---|---|---|
| US6405551B1 (en) * | 1999-05-20 | 2002-06-18 | Science, Inc. | Heating apparatus having refrigeration cycle |
| JP2005164064A (en) * | 2003-11-28 | 2005-06-23 | Sharp Corp | Air conditioner |
| CN111692730A (en) * | 2020-03-13 | 2020-09-22 | 广东美的制冷设备有限公司 | Air conditioner and sterilization control method thereof |
| CN115247858A (en) * | 2022-05-16 | 2022-10-28 | 美的集团武汉暖通设备有限公司 | Air conditioner, control method thereof, and computer-readable storage medium |
| CN115307280A (en) * | 2022-08-17 | 2022-11-08 | 广东美的制冷设备有限公司 | Control method and controller of multi-split air conditioning system, air conditioning system and medium |
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- 2022-11-14 CN CN202211421217.0A patent/CN115717761B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6405551B1 (en) * | 1999-05-20 | 2002-06-18 | Science, Inc. | Heating apparatus having refrigeration cycle |
| JP2005164064A (en) * | 2003-11-28 | 2005-06-23 | Sharp Corp | Air conditioner |
| CN111692730A (en) * | 2020-03-13 | 2020-09-22 | 广东美的制冷设备有限公司 | Air conditioner and sterilization control method thereof |
| CN115247858A (en) * | 2022-05-16 | 2022-10-28 | 美的集团武汉暖通设备有限公司 | Air conditioner, control method thereof, and computer-readable storage medium |
| CN115307280A (en) * | 2022-08-17 | 2022-11-08 | 广东美的制冷设备有限公司 | Control method and controller of multi-split air conditioning system, air conditioning system and medium |
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