CN110567100B - Multi-split air conditioner defrosting control method and multi-split air conditioner - Google Patents

Multi-split air conditioner defrosting control method and multi-split air conditioner Download PDF

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CN110567100B
CN110567100B CN201910832722.6A CN201910832722A CN110567100B CN 110567100 B CN110567100 B CN 110567100B CN 201910832722 A CN201910832722 A CN 201910832722A CN 110567100 B CN110567100 B CN 110567100B
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indoor units
room
defrosting
indoor
indoor unit
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CN110567100A (en
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于晓峰
杜永
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/43—Defrosting; Preventing freezing of indoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F24F11/66—Sleep mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2120/00—Control inputs relating to users or occupants
    • F24F2120/10—Occupancy
    • F24F2120/12—Position of occupants

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention relates to a defrosting control method for a multi-split air conditioner and the multi-split air conditioner, wherein when the defrosting condition is reached, the method comprises the following steps: detecting whether the current time is the sleep time of the user, if so, detecting whether people exist in the room, and calculating the ratio P of the total capacity of the indoor units in the unmanned room to the total capacity P of the indoor units operated in all the roomsIs free of；P1＜PIs free ofThe indoor unit in the unmanned room is defrosted, and the indoor unit in the manned room is not defrosted; p2 is less than or equal to PIs free ofThe defrosting of the indoor unit in the unmanned room is less than or equal to P1, and the defrosting of the indoor unit in the manned room is not performed; pIs free ofIf the sum of the capacities of the indoor units in the unmanned room and the indoor units in the manned room is less than P2, sequentially accumulating the total capacity of the indoor units in the unmanned room and the capacity of each indoor unit in the manned room until the ratio of the sum to P reaches P1, and defrosting the indoor units in the unmanned room and the indoor units in the manned room which participate in accumulation; and if not, defrosting the indoor unit needing defrosting. The invention is used for reducing the influence of refrigerant flowing sound on the sleep of a user.

Description

Multi-split air conditioner defrosting control method and multi-split air conditioner
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method for a multi-split air conditioner and the multi-split air conditioner.
Background
At present, most air conditioners on the market are in a normal unit stage due to the fact that frosting is inevitable when outdoor humidity is high and temperature is low in the winter heating stage. The conventional defrosting mode adopts a reverse defrosting mode, and the structure of a reverse defrosting system is shown in fig. 1, the air conditioner comprises an indoor unit 100 and an outdoor unit 200, and the indoor unit 100 and the outdoor unit 200 are connected through a refrigerant connecting pipeline. The indoor unit is provided with an indoor heat exchanger 101 and an indoor fan 102; the outdoor unit 200 includes an outdoor heat exchanger 201, an outdoor fan 202, an inverter compressor 203, a four-way valve 204, and a throttle element 205, which are connected to each other by a refrigerant connection line. The reverse defrosting process is as follows: when the control system of the air conditioner detects and judges that the outdoor heat exchanger 201 needs defrosting, the variable frequency compressor 203 firstly reduces the frequency or directly stops, and the indoor fan 102 and the outdoor fan 202 stop; then, the four-way valve 204 is reversed, the inverter compressor 203 is started, and defrosting is started. After the controller judges that the defrosting is clean, the variable frequency compressor 203 is stopped; then, the four-way valve 204 is reversed, the inverter compressor 203 is restarted, the outdoor fan 202 is started, the indoor fan 102 operates according to the cold air prevention program, and the air conditioner reenters the heating cycle process. Sometimes to enhance the efficiency in the normal defrosting, the indoor fan 102 is turned on in the normal defrosting, and this mode is called a breeze reinforcement defrosting mode.
Regardless of the defrosting mode, when the unit performs defrosting, the indoor unit generates a sound of water flow or air bubble burst, which is collectively called a refrigerant flow sound. The sound is more obvious and harsh when people are quiet at night, the sleep quality of users is seriously influenced, particularly, the users with shallow sleep and poor quality are influenced, and the user experience is poor.
Disclosure of Invention
One of the purposes of the invention is to provide a defrosting control method for a multi-split air conditioner, which can intelligently achieve defrosting, reduce the influence of refrigerant flowing sound on the sleep of a user and improve the user experience.
In order to solve the technical problems, the invention provides the following technical scheme for solving the problems:
the defrosting control method of the multi-split air conditioner is characterized by comprising the following steps of: detecting whether the current time of each indoor unit is the user sleep time or not, if so, detecting whether people exist in the room in which each indoor unit is positioned, and calculating the ratio P of the total capacity of the indoor units in the unmanned room to the total capacity P of the indoor units operated in all the roomsIs free of(ii) a If the first preset value P1 < PIs free ofDefrosting the indoor unit in the unmanned room, and not defrosting the indoor unit in the manned room; if the second preset value P2 is less than or equal to PIs free ofP1 or less, the indoor unit in the unmanned room is defrosted, and the indoor unit in the manned room is not defrosted; if P isIs free of< P2, the total capacity of the indoor units in the unmanned room and the capacity of each indoor unit in the manned room are sequentially added up to the sumThe ratio of the defrosting time to the defrosting time reaches P1, and the defrosting time is carried out on the indoor units in the unmanned room and the indoor units in the living rooms participating in the accumulation; if not, defrosting all indoor units needing defrosting; wherein P2 is more than 0 and less than or equal to P1 and less than 1.
In the defrosting control method of the multi-split air conditioner, the priority order of defrosting of the indoor units is preset, and the priority order is PIs free ofIf the sum of the capacities of the indoor units in the unmanned room is less than P2, the capacities of the indoor units in the manned room are sequentially added until the ratio of the sum to P reaches P1.
In the defrosting control method of the multi-split air conditioner, the defrosting sequence of the indoor unit which has small influence on the sleep of the user is set to be prior to the defrosting sequence of the indoor unit which has large influence on the sleep of the user.
According to the defrosting control method of the multi-split air conditioner, P1 is in the range of 35% to 60%, and P2 is in the range of 20% to 30%.
According to the defrosting control method for the multi-split air conditioner, when the unit reaches the defrosting condition, the indoor unit for defrosting is intelligently selected by detecting whether the current time is the sleep time of the user and the condition that the room is occupied or not, so that the influence of refrigerant flowing sound during defrosting on the sleep of the user is reduced to the maximum extent, and the user experience is improved.
Another object of the present invention is to provide a multi-split air conditioner, which includes a plurality of indoor units and line controllers communicatively connected to the indoor units, and further includes: the time acquisition module is in communication connection with the line controller and is used for acquiring the sleep time of the user; the human sensing module is in communication connection with the line controller and is used for sensing whether a person exists in a room where each indoor unit is located; the wire controller is used for executing the following operations: when the defrosting condition is achieved and the current time of each indoor unit is the sleep time of the user, calculating the ratio P of the total capacity of the indoor units in the unmanned room to the total capacity P of the indoor units operated in all the roomsIs free of(ii) a If the first preset value P1 < PIs free ofDefrosting the indoor unit in the unmanned room, and not defrosting the indoor unit in the manned room; if the second preset value P2 is less than or equal to PIs free ofP1 or less for people without humanThe indoor unit defrosts, but does not defrost the indoor unit in the room with people; if P isIs free ofIf the sum of the capacities of the indoor units in the unmanned room and the indoor units in the manned room is less than P2, sequentially accumulating the total capacity of the indoor units in the unmanned room and the capacity of each indoor unit in the manned room until the ratio of the sum to P reaches P1, and defrosting the indoor units in the unmanned room and the indoor units in the manned room which participate in the accumulation; when the defrosting condition is met and the current time of each indoor unit is not the sleep time of a user, defrosting all indoor units needing defrosting; wherein P2 is more than 0 and less than or equal to P1 and less than 1.
The multi-split air conditioner as described above, the line controller is further configured to: presetting the defrosting priority order of each indoor unit at PIs free ofIf the sum of the capacities of the indoor units in the unmanned room is less than P2, the capacities of the indoor units in the manned room are sequentially added until the ratio of the sum to P reaches P1.
The multi-split air conditioner as described above, the line controller is further configured to: the defrosting sequence of the indoor units which have small influence on the sleep of the user is set to be prior to the defrosting sequence of the indoor units which have large influence on the sleep of the user.
The multi-split air conditioner as described above, P1 is in the range of 35% to 60%, and P2 is in the range of 20% to 30%.
According to the multi-split air conditioner, when the unit reaches the defrosting condition, the clock module is used for setting the sleep time of a user, the human sensing module is used for detecting whether a person exists in a room, and the indoor unit for defrosting is intelligently selected according to the sleep time set by the user and the condition that the person exists in the room, so that the influence of refrigerant flowing sound during defrosting on the sleep of the user is reduced to the maximum extent, and the user experience is improved; and the sleep time of the user can be freely set according to the user requirements, the indoor unit participating in defrosting can be intelligently selected, and the user experience is good.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments of the present invention or the prior art will be briefly described below, and it is obvious that the drawings described below are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a block diagram of a prior art reverse defrost air conditioning system;
fig. 2 is a block diagram of an embodiment of a multi-split air conditioner according to the present invention;
fig. 3 is a flowchart of a defrosting control method of the multi-split air conditioner shown in fig. 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
Referring to fig. 2, a block diagram of an embodiment of a multi-split air conditioner according to the present invention is shown. In this embodiment, the multi-split air conditioner includes a plurality of indoor units (only one indoor unit 100 is shown in fig. 2) and an outdoor unit (not shown), each of the indoor units and the outdoor unit is communicatively connected to the line controller 300, and each of the indoor units and the outdoor unit is connected to each other through a refrigerant connection pipe.
In this embodiment, in order to set the sleep time for the user conveniently, the sleep time may be a sleep time period set by the user, or may be a default night sleep time period, for example, 20:00 to 6:00, the sleep time period may be obtained by the time obtaining module 400, and the time obtaining module 400 may adopt the clock module 400 or may adopt another module that monitors the time and communicates with the line controller 300. The human body sensing module 500 is used for sensing whether a person is in a room, and the human body sensing module 500 may adopt an independent human body sensing module for detecting an infrared temperature or other modules, such as a pyroelectric sensor, for monitoring whether a person is in a room and communicating with the line controller 300.
Fig. 3 is a flowchart illustrating a defrosting control method of the multi-split air conditioner shown in fig. 2, and the specific defrosting process is as follows:
s301: the process begins.
S302: the multi-split air conditioner performs normal heating operation.
S303: and judging whether the defrosting condition is reached, if so, executing the step S304, otherwise, continuing to execute the normal heating process of the step S302.
The defrosting condition can be determined according to the existing determination criteria, for example, the running time of the inverter compressor and the temperature difference between the ambient temperature and the outdoor unit coil temperature.
S304: and judging whether the sleep time of the user is available. The user sleep time can be the sleep time set by the user through the clock module or a default night sleep time period. If the current time is the user sleep time, executing step S305, otherwise executing step S306.
S305: whether the indoor unit needs to be defrosted or not is judged according to the specific situation that people exist or not in the room, and the total capacity P of the indoor unit in the room with people is calculated in the stepAlways haveAnd total capacity P of indoor unit in unmanned roomAll without(the indoor units participating in the calculation here are surely the indoor units in the heating operation), and the total capacity P of the indoor units in the unmanned room is calculatedAll withoutTotal capacity P = P of indoor unit for heating operation in all roomsAlways have+PAll withoutRatio P ofIs free of=PAll without/P。
And S306, defrosting all the indoor units which reach the defrosting mode (including conventional defrosting and breeze reinforced defrosting), and after the defrosting process is finished, switching to the normal heating operation process of the step S302.
S307, judging PIs free ofWith a first predetermined value P1, if PIs free ofIf > P1, go to step S308, otherwise go to step S309. In the present embodiment, the parameter range of P1 is selected to be in the range of 35% to 60%, and P1 is selected to be 40% for convenience of explanation.
S308: when P is presentIs free ofWhen the ratio is more than 40%, selecting the room in the unmanned roomThe defrosting method comprises the steps that the inner machine is defrosted (conventional defrosting and breeze reinforced defrosting), the inner machine in a room with a person is not defrosted, the inner machine which does not participate in defrosting is not defrosted, an electronic expansion valve is closed, no refrigerant flows through, no noise exists, and after the defrosting process is executed, the normal heating operation process of the step S302 is carried out. In step S308, since the number of the indoor units in the current unmanned room is large, the indoor units in the unmanned room can be subjected to conventional defrosting, thereby saving energy.
S309: when P is presentIs free ofWhen the content is less than or equal to 40 percent, judging PIs free ofWith a second predetermined value P2, if PIs free ofAnd P2, executing step S310, otherwise executing step S311. In the present embodiment, the parameter range of P2 is selected to be in the range of 20% to 30%, and P2 is selected to be 25% for convenience of explanation.
S310, when the ratio of 40% to P is more than or equal toIs free ofAnd when the defrosting rate is more than or equal to 25 percent, selecting to defrost the indoor unit in the unmanned room (including conventional defrosting and breeze reinforced defrosting), but not defrost the indoor unit in the manned room, closing the electronic expansion valve, and turning to the normal heating operation process of the step S302 after the defrosting process is executed, wherein the indoor unit does not participate in defrosting, and the electronic expansion valve is closed, and no refrigerant flows through and has no noise. In step S310, since the number of the indoor units in the current unmanned room is small, the indoor units in the unmanned room can be subjected to breeze-enhanced defrosting, so that the defrosting efficiency is improved.
S311: when P is presentIs free ofAnd when the sum is less than or equal to 25 percent, sequentially accumulating the total capacity of the indoor units in the unmanned room and the capacity of each indoor unit in the manned room until the ratio of the sum to the P reaches P1, and executing the step S312.
S312: defrosting the indoor units in the unmanned room and the accumulated indoor units in the occupied room (including conventional defrosting and breeze-enhanced defrosting), and after the defrosting process is executed, switching to the normal heating operation process of the step S302.
Specifically, in the present embodiment, the order of priority for defrosting the indoor units is set in advance, for example, the indoor units in the living room, the kitchen, the study room, and the bathroom are superior to the indoor unit in the bedroom, the indoor unit in the young room is defrosted preferentially to the indoor unit in the old (or young) room, and the like, so as to reduce the influence on the sleep of the user during defrosting. And sequentially accumulating the total capacity of the indoor units in the unmanned room and the capacity of each of the indoor units with the priorities from high to low according to the defrosting priorities of the indoor units in the manned room from high to low until the ratio of the total sum to the P reaches P1, wherein the indoor units in the unmanned room are subjected to conventional defrosting or breeze-enhanced defrosting, and the indoor units in the manned room participating in the accumulation are subjected to conventional defrosting or breeze-enhanced defrosting. In this case, for the purpose of reducing the influence of the user, the breeze-enhanced defrosting is performed on the indoor units in the unmanned room, and the regular defrosting is performed on the indoor units in the occupied rooms participating in the accumulation.
For example, the capacities of the indoor units in rooms 1# to 8# are all 1, and the defrosting sequence of rooms 1# to 8# is sequentially decreased, if no person is in rooms 5# and 6# and the remaining rooms have a person, it is first determined whether the sum of the capacity P5 of the indoor unit in room 5# and the capacity P6 of the indoor unit in room 6# exceeds 25%, if not, the capacity of the indoor unit in selected room 1# is accumulated, i.e., P5+ P6+ P1, if the capacity of the indoor unit in room 2# has not been continuously selected by more than 25%, i.e., P5+ P6+ P1+ P2, at this time, if P5+ P6+ P1+ P2 ≧ 40%, the breeze-enhanced defrosting is performed on the indoor units in rooms 5# and 6#, the normal defrosting is performed on the indoor units in rooms 1# and 2#, the indoor units having the remaining persons have a defrost, the electronic expansion valve is closed, and no refrigerant flows through, there is no noise.
According to the defrosting control method of the multi-split air conditioner and the multi-split air conditioner, when the unit reaches the defrosting condition, the indoor unit for defrosting is intelligently selected by setting the sleeping time of a user and detecting whether people exist in a room, so that the influence of refrigerant flowing sound on the sleeping of the user during defrosting is reduced to the maximum extent, and the user experience is improved; and the sleeping time of the user and the defrosting priority sequence of the indoor units can be freely set according to the user requirements, the indoor units participating in defrosting can be intelligently selected, and the user experience is good.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (6)

1. The defrosting control method of the multi-split air conditioner is characterized by comprising the following steps of:
detecting whether the current time of each indoor unit is the sleep time of the user,
if yes, detecting whether a person exists in the room where each indoor unit is located, and calculating the ratio P of the total capacity of the indoor units in the unmanned room to the total capacity P of the indoor units operated in all the roomsIs free of(ii) a If the first preset value P1 < PIs free ofPerforming a normal defrost mode for the indoor units in the unmanned room, and not performing the defrost mode for the indoor units in the manned room; if the second preset value P2 is less than or equal to PIs free ofP1 or less, executing a breeze reinforced defrosting mode for the indoor unit in the unmanned room, and not executing the defrosting mode for the indoor unit in the manned room; if P isIs free ofIf the sum of the capacities of the indoor units in the unmanned room and the indoor units with people is less than P2, accumulating the total capacity of the indoor units in the unmanned room and the capacity of each indoor unit with the priority from high to low in the rooms with people in sequence until the ratio of the sum to P reaches P1, executing a breeze reinforced defrosting mode on the indoor units in the unmanned room at the moment, and executing a conventional defrosting mode on the indoor units in the rooms with people participating in accumulation;
if not, executing a defrosting mode on all the indoor units;
wherein P2 is more than 0 and less than or equal to P1 and less than 1.
2. The defrosting control method of a multi-split air conditioner as set forth in claim 1, wherein the order in which the indoor units having less influence on the sleep of the user perform the defrosting mode is set to be prior to the order in which the indoor units having greater influence on the sleep of the user perform the defrosting mode.
3. A multi-split air conditioner defrosting control method as set forth in claim 1 or 2, wherein P1 is in the range of 35% to 60%, and P2 is in the range of 20% to 30%.
4. The utility model provides a many online air conditioners, its includes a plurality of indoor sets and with each indoor set communication connection's drive-by-wire ware, its characterized in that, many online air conditioners still includes:
the time acquisition module is in communication connection with the line controller and is used for acquiring the sleep time of the user;
the human body sensing module is in communication connection with the wire controller and is used for sensing whether people exist in a room where each indoor unit is located;
the wire controller is used for executing the following operations:
when the defrosting condition is achieved and the current time of each indoor unit is the sleep time of the user, calculating the ratio P of the total capacity of the indoor units in the unmanned room to the total capacity P of the indoor units operated in all the roomsIs free of(ii) a If the first preset value P1 < PIs free ofPerforming a normal defrost mode for the indoor units in the unmanned room, and not performing the defrost mode for the indoor units in the manned room; if the second preset value P2 is less than or equal to PIs free ofP1 or less, executing a breeze reinforced defrosting mode for the indoor unit in the unmanned room, and not executing the defrosting mode for the indoor unit in the manned room; if P isIs free ofIf the sum of the capacities of the indoor units in the unmanned room and the indoor units with people is less than P2, accumulating the total capacity of the indoor units in the unmanned room and the capacity of each indoor unit with the priority from high to low in the rooms with people in sequence until the ratio of the sum to P reaches P1, executing a breeze reinforced defrosting mode on the indoor units in the unmanned room at the moment, and executing a conventional defrosting mode on the indoor units in the rooms with people participating in accumulation;
when the defrosting condition is met and the current time of each indoor unit is not the sleep time of the user, executing a defrosting mode on all the indoor units; wherein P2 is more than 0 and less than or equal to P1 and less than 1.
5. A multi-split air conditioner as set forth in claim 4, wherein said wire controller is further configured to: the sequence of executing the defrosting mode by the indoor unit which has small influence on the sleep of the user is set to be prior to the sequence of executing the defrosting mode by the indoor unit which has large influence on the sleep of the user.
6. A multi-split air conditioner as claimed in claim 4, wherein P1 is in the range of 35% to 60% and P2 is in the range of 20% to 30%.
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CN114198866B (en) * 2021-11-26 2023-08-15 青岛海尔空调电子有限公司 Defrosting control method of multi-split air conditioner and multi-split air conditioner

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