CN108195099A - A kind of connected machine and its control method - Google Patents
A kind of connected machine and its control method Download PDFInfo
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- CN108195099A CN108195099A CN201711447901.5A CN201711447901A CN108195099A CN 108195099 A CN108195099 A CN 108195099A CN 201711447901 A CN201711447901 A CN 201711447901A CN 108195099 A CN108195099 A CN 108195099A
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- temperature
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- indoor unit
- threshold
- threshold value
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
- F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/006—Cooling of compressor or motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
- F25B2313/02331—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements during cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
- F25B2313/02334—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements during heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/08—Exceeding a certain temperature value in a refrigeration component or cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21153—Temperatures of a compressor or the drive means therefor of electronic components
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- 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 kind of connected machine and its control methods, are related to multi-connected machine technology field, to solve the problems, such as that compressor protection is caused to be shut down due to the refrigerant in cooler is very few in the prior art invents.A kind of connected machine of the present invention includes outdoor unit, multiple indoor units and heat exchange major loop, outdoor unit includes the first throttling device being arranged on heat exchange major loop and heat exchange branch, the branch that exchanges heat includes cooling heat exchanger and second throttling device, cooling heat exchanger is used to cool down the drive circuit board of compressor, the temperature sensor being arranged on the drive circuit board of compressor is further included, for detecting the temperature of drive circuit board；For obtaining the controller of the temperature of drive circuit board from temperature sensor；And in the case where temperature meets first condition, reduce the aperture of first throttling device and/or increase the aperture of second throttling device.Connected machine of the present invention is used to provide refrigeration or heating to multiple rooms with variable refrigerant volume.
Description
Technical field
The present invention relates to multi-connected machine technology field more particularly to a kind of connected machine and its control methods.
Background technology
Connected machine includes at least one outdoor unit, multiple indoor units and the heat exchange for connecting outdoor unit with indoor unit
Circuit forms, wherein, outdoor unit is made of outdoor heat exchanger, compressor and other refrigeration attachmentes, and indoor unit is by wind turbine and interior
The compositions such as heat exchanger, and compressor is equipped with the drive circuit board for being used to implement frequency conversion, it can be according to the variation of indoor load, outdoor pressure
Contracting machine exports the changes in demand to coordinate indoor unit by the flow changed to adjust refrigerant of rotating speed so that the energy consumption of air-conditioning
It is relatively low.
In existing connected machine, heat exchange branch is parallel on the part pipeline that is located outside in heat-exchanging loop in machine
Road is provided with cooling heat exchanger on heat exchange branch road, which is used to cool down the drive circuit board of compressor.
Originally it is that 4 indoor units carry out refrigerating operatons in practical application, such as when indoor unit freezes and heats simultaneously,
One indoor unit carries out heating operation, is switched to 1 indoor unit later and carries out heating operation, an indoor unit carries out refrigeration fortune
Row, it may appear that the refrigerant entered in heat exchange branch is less, and cooling heat exchanger is caused to imitate the cooling of compressor drive circuit plate
Fruit is poor, and the driving circuit plate temperature of compressor is higher, influences the reliability of air-conditioning, easily causes asking for compressor protection shutdown
Topic.
Invention content
The embodiment of the present invention provides a kind of connected machine and its control method, can reduce in the prior art because of cooler
Interior refrigerant is very few and the problem of compressor protection is caused to be shut down.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that：
A kind of connected machine, including outdoor unit, multiple indoor units and for connecting the outdoor unit and multiple described
The heat exchange major loop of indoor unit, the outdoor unit is interior to be equipped with compressor, and the outdoor unit is led back comprising the heat exchange is arranged on
The first throttling device of road and the heat exchange branch in parallel with the first throttling device, the heat exchange branch include cold
But heat exchanger and second throttling device, the cooling heat exchanger are used to cool down the drive circuit board of the compressor, further include：Temperature
Sensor is spent, the temperature sensor is arranged on the drive circuit board of the compressor, for detecting the drive circuit board
Temperature；Controller, the controller are used to obtain the temperature of the drive circuit board from the temperature sensor；And institute
It states in the case that temperature meets first condition, reduces the aperture of the first throttling device and/or increase the second throttling dress
The aperture put；Wherein, the first condition includes the temperature and is more than first threshold；Or it is more than described the including the temperature
One threshold value and less than the second threshold.
The embodiment of the present invention further includes a kind of control method of connected machine, the connected machine include outdoor unit,
Multiple indoor units and the heat exchange major loop for connecting the outdoor unit and multiple indoor units are equipped in the outdoor unit
Compressor, and the outdoor unit include be arranged on it is described heat exchange major loop on first throttling device and with the first segment
The heat exchange branch of device parallel connection is flowed, the heat exchange branch includes cooling heat exchanger and second throttling device, the cooling heat transferring
Device is used to cool down the drive circuit board of the compressor, and the control method includes：Obtain the temperature of the drive circuit board；
In the case that the temperature meets first condition, reduce the aperture of the first throttling device and/or increase second throttling
The aperture of device；Wherein, the first condition includes the temperature and is more than first threshold；Or including：The temperature is more than the
One threshold value and less than second threshold.
Connected machine provided in an embodiment of the present invention and its control method are driven by the compressor that temperature sensor detects
The temperature of dynamic circuit board, when the temperature detected is more than first threshold or the temperature detected is more than first threshold and less than the
During two threshold values, the aperture of first throttling device or the aperture of increase second throttling device can be reduced or reduce first throttling device
Aperture increase the aperture of second throttling device simultaneously, so as to improve the amount that refrigerant is flowed through in cooling heat exchanger so that cold
But the heat transfer effect of heat exchanger and drive circuit board is preferable, and the temperature of drive circuit board is maintained at relatively low range, so as to reduce pressure
There is the phenomenon that protection is shut down in contracting machine, and the reliability of equipment is preferable.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of refrigerant circulation schematic diagram of water-cooled connected machine；
Fig. 2 is the refrigerant circulation schematic diagram that water-cooled connected machine is in full heating operation；
Fig. 3 is the refrigerant circulation schematic diagram that water-cooled connected machine is in full refrigerating operaton；
Fig. 4 is that the indoor unit total capacity freezed in water-cooled connected machine is always held more than the indoor unit heated
Refrigerant circulation schematic diagram during amount；
Fig. 5 is that the indoor unit total capacity heated in water-cooled connected machine is always held more than the indoor unit to freeze
Refrigerant circulation schematic diagram during amount；
Fig. 6 is the flow diagram of the control method of 1 connected machine of embodiment；
Fig. 7 is the flow diagram of the control method of 2 connected machine of embodiment.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that term " " center ", " on ", " under ", "front", "rear", " left side ",
The orientation or position relationship of the instructions such as " right side ", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " are based on shown in the drawings
Orientation or position relationship, be for only for ease of the description present invention and simplify description rather than instruction or imply signified device or
Element must have specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
Fig. 1 is a kind of refrigerant circulation schematic diagram of water-cooled connected machine.
With reference to Fig. 1, water-cooled connected machine includes 100, three indoor units of outdoor unit and connection outdoor unit 100 and more
The heat exchange major loop 300 of a indoor unit.Wherein, exchange heat major loop 300 in be set to outdoor unit 100 component include compressor 1,
Oil eliminator 2, check valve 3, four-way reversing valve component 4, gas-liquid separator 5, high-pressure reservoir 6, the 7, first electricity of outdoor heat exchanger
Sub- expansion valve 8, the second electric expansion valve 9 and cooling heat exchanger (not shown) etc., wherein, 9 He of the second electric expansion valve
Cooling heat exchanger is connected, and the first electric expansion valve 8 is in parallel with the second electric expansion valve 9, cooling heat exchanger, and cooling heat exchanger is used for
The drive circuit board 10 of compressor 1 is cooled down, temperature sensor 17 is provided on the drive circuit board 10 of compressor 1；Heat exchange master
The component that indoor unit is set in circuit 300 includes indoor heat exchanger 11 and third electric expansion valve 12；It further includes and is arranged on room
High-low voltage stop valve 13, low-pressure shutoff valve 14 and liquid side shut-off valve 15 and general between interior machine and outdoor unit 100 is each indoor
The control valve unit 16 that machine is connect with outdoor unit 100 also has valve member such as solenoid valve, capillary and filterings of some auxiliary in figure
Device etc..
Above-mentioned cooling heat exchanger includes the first aluminium sheet and the copper pipe being wrapped on the first aluminium sheet, the driving electricity of compressor 1
The lower section of road plate 10 is equipped with the second aluminium sheet, the first aluminium sheet and the second aluminium sheet is fitted closely, so as to fulfill to drive circuit board 10
Cooling.
For water-cooled connected machine, outdoor heat exchanger 7 can be plate heat exchanger or shell and tube exchanger.
The outdoor heat exchanger 7 in water-cooled connected machine in Fig. 1 is plate heat exchanger, and be connected with water inlet pipe and outlet pipe, such as
Shown in figure；Three indoor units are respectively the indoor unit 203 of indoor unit 202, three of No.1 indoor unit 201, two, four-way reversing valve group
Part 4 includes the first four-way reversing valve 41 and the second four-way reversing valve 42, and control valve unit 16 includes the 4th electronic expansion in parallel
161 and the 5th electric expansion valve 162 of valve.
Below under each operating mode described in the water-cooled multi-connected machine in Fig. 1 all parts open and close rule and refrigerant flowing into
Row explanation：
(1) full heating condition
When all indoor units are in heating condition, the flow direction of refrigerant is as shown in Fig. 2, the first four-way reversing valve 41 closes
It closes, D ends are connected with C-terminal, and E ends are connected with S ends；Second four-way reversing valve 42 is opened, and D ends are connected with E ends, and C-terminal is connected with S ends,
4th electric expansion valve 161 of all indoor units is opened, and the 5th electric expansion valve 162 is turned off.
The refrigerant gas of the exhaust end discharge high temperature and pressure of compressor 1 passes through oil eliminator 2, check valve 3, the first four-way
D, C-terminal, high-low voltage stop valve 13, the 4th electric expansion valve 161 of reversal valve 41 are known as high pressure after the condensation of indoor heat exchanger 11
Liquid refrigerant is divided into two strands of refrigerants after third electric expansion valve 12, liquid side shut-off valve 15, one refrigerant is through the first electricity
Sub- expansion valve 8, another strand of refrigerant is after cooling heat exchanger, the second electric expansion valve 9, after two strands of refrigerants converge, through high pressure
Liquid storage device 6, outdoor heat exchanger 7, C, S end of the second four-way reversing valve 42, gas-liquid separator 5, finally return back to the suction of compressor 1
Gas end.
(2) full cooling condition
When all indoor units are in cooling condition, the flow direction of refrigerant is as shown in figure 3, the first four-way reversing valve 41 is beaten
It opens, D ends are connected with E ends, and C-terminal is connected with S ends；Second four-way reversing valve 42 is closed, and D ends are connected with C-terminal, and E ends are connected with S ends,
4th electric expansion valve 161 of all indoor units is closed, and the 5th electric expansion valve 162 is opened.
The refrigerant gas of the exhaust end discharge high temperature and pressure of compressor 1 passes through oil eliminator 2, check valve 3, the second four-way
The D of reversal valve 42, C-terminal, it is known as high pressure liquid refrigerant after the condensation of outdoor heat exchanger 7, is divided to through high-pressure reservoir 6 for two bursts of systems
Cryogen, one refrigerant through the first electric expansion valve 8, another strand of refrigerant after cooling heat exchanger, the second electric expansion valve 9,
After two strands of refrigerants converge, through liquid side shut-off valve 15, third electric expansion valve 12, indoor heat exchanger 11, the 5th electric expansion valve
162nd, low-pressure shutoff valve 14, gas-liquid separator 5 finally return back to the suction end of compressor 1.
(3) recuperation of heat operating mode
When part indoor unit is in heating condition, when being partially in cooling condition, multi-connected machine is in recuperation of heat operating mode, for
The total capacity of the indoor unit to freeze is more than the total capacity of indoor unit heated and total appearance of the indoor unit heated
Amount is more than under the two kinds of operating modes of total capacity of indoor unit freezed, and there are two types of the accesses of refrigerant.
By taking the total capacity of all indoor units is identical as an example, when No.1 indoor unit 201 and No. two indoor units 202 are in refrigeration and transport
When row, No. three indoor units 203 are in heating operation, that is, the total capacity of the indoor unit to freeze is more than the indoor unit heated
Total capacity (i.e. cooling load be more than heating load), the first four-way reversing valve 41 and the second four-way reversing valve 42 are turned off, one
Number indoor unit 201 and the 4th electric expansion valve 161 of No. two indoor units 202 is closed, the 5th electric expansion valve 162 is opened, No. three
4th electric expansion valve 161 of indoor unit 203 is opened, the 5th electric expansion valve 162 is closed, and the flow direction of refrigerant is as shown in Figure 4.
After the refrigerant gas of the exhaust end discharge high temperature and pressure of compressor 1 is by oil eliminator 2, check valve 3, it is divided into two
Stock refrigerant, D of one refrigerant through the first four-way reversing valve 41, C-terminal, high-low voltage stop valve 13, through in No. three indoor units 203
Indoor heat exchanger 11 condenses, then through corresponding third electric expansion valve 12, another strand of refrigerant is through the second four-way reversing valve 42
D, after C-terminal, outdoor heat exchanger 7, high-pressure reservoir 6, then the first electric expansion valve 8 and the second electric expansion valve 9, cold are respectively enterd
But heat exchanger, later again after liquid side shut-off valve 15 and another strand of refrigerant converge, through No.1 indoor unit 201 and No. two indoor units
After 202 third electric expansion valve 12, indoor heat exchanger 11, then through low-pressure shutoff valve 14, gas-liquid separator 5, finally return back to
The suction end of compressor 1.
Heating operation is in No.1 indoor unit 201 and No. two indoor units 202, No. three indoor units 203 are in refrigerating operaton
When, that is, the total capacity of the indoor unit heated is more than the total capacity of the indoor unit to freeze, and ((i.e. heating load, which is more than, freezes
Load)), the first four-way reversing valve 41 is closed, and the second four-way reversing valve 42 is opened, No.1 indoor unit 201 and No. two indoor units 202
The 4th electric expansion valve 161 open, the 5th electric expansion valve 162 is closed, the 4th electric expansion valve of No. three indoor units 203
161 close, and the 5th electric expansion valve 162 is opened, and the flow direction of refrigerant is as shown in Figure 5.
The refrigerant gas of the exhaust end discharge high temperature and pressure of compressor 1 passes through oil eliminator 2, check valve 3, the first four-way
D, C-terminal, the high-low voltage stop valve 13 of reversal valve 41 respectively enter the indoor unit in No.1 indoor unit 201 and No. two indoor units 202
Heat exchanger 11, third electric expansion valve 12, the two are separated into two strands of refrigerants after converging, one refrigerant is through No. three indoor units
Third electric expansion valve 12, indoor set heat exchanger 11 in 203, then through the 5th electric expansion valve 162, low-pressure shutoff valve 14；Separately
One refrigerant is through liquid side shut-off valve 15, the first electric expansion valve 8, cooling heat exchanger, the second electric expansion valve 9, high pressure liquid storage
Device 6, outdoor heat exchanger 7, the second four-way reversing valve 42 C, S end；Two strands of refrigerants through gas-liquid separator 5 return to compression after converging
The suction end of machine 1.
Embodiment 1
The present embodiment is a kind of control method of connected machine, which includes outdoor unit, multiple indoor units
And the heat exchange major loop for connecting outdoor unit and multiple indoor units, outdoor unit is interior to be equipped with compressor, and outdoor unit is included and set
It puts in first throttling device and the heat exchange branch in parallel with first throttling device on major loop of exchanging heat, the heat exchange branch
Including cooling heat exchanger and second throttling device, cooling heat exchanger is used to cool down the drive circuit board of compressor.In the present embodiment
Control method include obtain drive circuit board temperature, in the case where the temperature of drive circuit board meets first condition, subtract
The aperture of small first throttling device or the aperture of aperture or reduction first throttling device for increasing second throttling device increase simultaneously
The aperture of big second throttling device.Wherein, first condition includes the temperature of drive circuit board more than first threshold.
The control method of the present embodiment is by obtaining the temperature of drive circuit board, when the temperature of drive circuit board is more than first
Threshold value, the aperture that can reduce the first electric expansion valve 8 or the aperture for increasing the second electric expansion valve 9 or the first electronics of reduction are swollen
The first electric expansion valve 8 opens in the aperture of swollen valve 8 while the aperture for increasing the second electric expansion valve 9, such as reduction Fig. 1 or Fig. 2
Degree, so as to improve the amount that refrigerant is flowed through in cooling heat exchanger so that the heat transfer effect of cooling heat exchanger and drive circuit board
Preferably, the temperature of drive circuit board is positively retained at relatively low range, the phenomenon that protection is shut down occurs so as to reduce compressor, equipment
Reliability is preferable.
Connected machine can be air-cooled connected machine or water-cooled connected machine in the present embodiment.Because of water
Source multi-connected machine is installed in closed equipment room, after a large amount of fevers of drive circuit board of frequency conversion, it is impossible to by empty with the external world
Gas heat exchange is radiated, and dependence cooling heat exchanger is needed to radiate, so, the control method of the present embodiment is to improving water source
The heat dissipation effect of the variable frequency drive plate of multi-connected machine is preferable.
By taking the water-cooled multi-connected machine shown in Fig. 1 as an example, wherein, the quantity of outdoor unit 100 is not limited only to one in multi-connected machine
It is a, can be multiple；The quantity of indoor unit is also not only limited to 3 or 2 or more than 3, and first throttling device corresponds to
One electric expansion valve 8, second throttling device correspond to the second electric expansion valve 9, and the control valve member to exchange heat on major loop not only limits
Shown in Fig. 1, it can need to add according to practical function or reduce, not form the limitation to the application.
Optionally, the temperature of above-mentioned acquisition drive circuit board 10 includes：Driving circuit is repeatedly obtained with setting time interval
The temperature of plate 10.
Based on above-described embodiment, above-mentioned indoor unit includes the third throttling set being arranged on heat exchange major loop, i.e. Fig. 3
In third electric expansion valve 12.It is at least one to be in refrigerating operaton, and institute at least in heating operation in multiple indoor units
The total capacity for having the indoor unit in refrigerating operaton is more than the total capacity of all indoor units in heating operation and detects
Temperature meet second condition in the case of, if in the first indoor unit third electric expansion valve 12 aperture be more than first setting open
Degree then reduces the aperture of third electric expansion valve 12 in the first indoor unit.Wherein, the first indoor unit is is in heating in indoor unit
Any of operation, the third electric expansion valve 12 as reduced No. three indoor units 203 in Fig. 4；For the first time, above-mentioned Article 2
Part is more than third threshold value including this temperature or the temperature of last time；In n-th (n >=2), second condition includes this temperature
It is more than third threshold value more than the temperature of last time and this temperature or the temperature of last time.
Optionally, it is at least one in heating operation in multiple indoor units, it is at least one to be in refrigerating operaton and all
The total capacity of indoor unit in heating operation is more than the total capacity of all indoor units in refrigerating operaton and detects
In the case that temperature meets third condition, if the aperture of third electric expansion valve 12 is opened more than the first setting in the second indoor unit
Degree then reduces the aperture of third electric expansion valve 12 in the second indoor unit.Wherein, the second indoor unit is is in refrigeration in indoor unit
Any of operation, the third electric expansion valve 12 as reduced No. three indoor units 203 in Fig. 5；For the first time, above-mentioned Article 3
Part is more than third threshold value including this temperature or the temperature of last time；In n-th (n >=2), second condition includes this temperature
It is more than third threshold value more than the temperature of last time and this temperature or the temperature of last time.
In the temperature of above-mentioned drive circuit board 10 and the Rule of judgment of each threshold value, it is more than the with the temperature of drive circuit board 10
Can also be that the temperature of drive circuit board 10 is more than or equal to first threshold for one threshold value.
Optionally, above-mentioned first throttling device, second throttling device and third throttling set are electric expansion valve, capillary
Pipe or heating power expansion valve.Preferably, the first throttling device of the present embodiment, second throttling device and third throttling set use
Electric expansion valve, it is easy to adjust, it can be achieved that step-less adjustment and to adjust reaction fast.
With reference to Fig. 6, the control method of the connected machine of the present embodiment is further detailed.
The temperature T of drive circuit board 10 is obtained when first time, is i.e. during n=1, is more than the in the temperature T of drive circuit board 10
In the case of one threshold value, the aperture for reducing the first electric expansion valve 8 or the aperture for increasing the second electric expansion valve 9 or reduce the
The aperture of one electric expansion valve 8 increases the aperture of the second electric expansion valve 9 simultaneously.
It is when n-th obtains the temperature T (n) of drive circuit board 10, i.e. big in the temperature T (n) of drive circuit board 10 during n >=2
In the case of first threshold, reduce the aperture of the first electric expansion valve 8 or increase the aperture of the second electric expansion valve 9 or subtract
The aperture of small first electric expansion valve 8 increases the aperture of the second electric expansion valve 9 simultaneously；
It is at least one in heating operation in multiple indoor units after adjusting, it is at least one in refrigerating operaton, and
The total capacity of all indoor units in refrigerating operaton be more than all indoor units in heating operation total capacity and this
Temperature be more than the temperature of last time, and more than in the case of third threshold value, if third electric expansion valve 12 in the first indoor unit
Aperture is more than the first setting aperture, reduces the aperture of third electric expansion valve 12 in the first indoor unit；Or in multiple indoor units
It is at least one in heating operation, it is at least one in refrigerating operaton, and the total capacity of all indoor units in heating operation
More than the temperature that the total capacity of all indoor units in refrigerating operaton and this temperature are more than last time, and more than third
In the case of threshold value, if the aperture of third electric expansion valve 12 is more than the first setting aperture in the second indoor unit, reduce second Room
The aperture of third electric expansion valve 12 in interior machine.
After adjusting again, in the case where this temperature is more than second threshold, control compressor protection is shut down, journey
Sequence terminates.
Wherein, first threshold ＜ thirds threshold value ＜ second thresholds.
Optionally, first threshold is 35 DEG C in the present embodiment, and third threshold value is 70 DEG C, and second threshold is 100 DEG C, during setting
Between between be divided into 20s, first sets the value range of aperture as 0.1~0.15 times of the specified aperture of third electric expansion valve 12.
Optionally, if the aperture of the third throttling set in the first indoor unit is more than the first setting aperture, by the
The aperture of the third electric expansion valve 12 of one indoor unit reduces the second setting aperture (setting step number).Optionally, which walks
Number is 50 steps.
Embodiment 2
The present embodiment is the control method of another connected machine, similar with the method for embodiment 1.Similarly, with Fig. 1
Described in water-cooled multi-connected machine for.
The control method of the present embodiment includes the temperature for obtaining drive circuit board 10, meets in the temperature of drive circuit board 10
In the case of first condition, reduce the second electronic expansion of aperture or increase of the first electric expansion valve 8 (i.e. first throttling device)
The aperture of valve 9 (i.e. second throttling device) reduces the aperture of the first electric expansion valve 8 while increases the second electric expansion valve 9
Aperture.Wherein, first condition includes the temperature of drive circuit board 10 more than first threshold and less than second threshold.
Optionally, if the temperature of drive circuit board 10 is more than second threshold, compressor protection is controlled to shut down.
The control method of the present embodiment is by obtaining the temperature of drive circuit board 10, when the temperature of drive circuit board 10 is more than
First threshold and less than second threshold when, reduce the first electric expansion valve 8 (i.e. first throttling device) aperture or increase second
The aperture of electric expansion valve 9 (i.e. second throttling device) reduces the aperture of the first electric expansion valve 8 while increases the second electronics
The aperture of expansion valve 9, so as to improve the amount that refrigerant is flowed through in cooling heat exchanger so that cooling heat exchanger and drive circuit board
10 heat transfer effect is preferable, and the temperature of drive circuit board 10 is maintained at relatively low range, protection shutdown occurs so as to reduce compressor
The phenomenon that, the reliability of equipment is preferable.
Optionally, the temperature of above-mentioned acquisition drive circuit board 10 includes：Driving circuit is repeatedly obtained with setting time interval
The temperature of plate 10.
Based on above-described embodiment, above-mentioned indoor unit includes the third throttling set being arranged on heat exchange major loop, i.e. Fig. 3
In third electric expansion valve 12.It is at least one to be in refrigerating operaton, and institute at least in heating operation in multiple indoor units
The total capacity for having the indoor unit in refrigerating operaton is more than the total capacity of all indoor units in heating operation and driving electricity
In the case that the temperature of road plate 10 meets second condition, if the aperture of third electric expansion valve 12 is more than first in the first indoor unit
Aperture is set, then reduces the aperture of third electric expansion valve 12 in the first indoor unit.Wherein, the first indoor unit is in indoor unit
In any of heating operation, the third electric expansion valve 12 as reduced No. three indoor units 203 in Fig. 4；It is above-mentioned for the first time
Second condition is more than third threshold value and less than second threshold including this temperature or the temperature of last time；In n-th (n >=2),
Two conditions include that this temperature is more than the temperature of last time and this temperature or the temperature of last time are more than third threshold value and small
In second threshold.
Optionally, it is at least one in heating operation in multiple indoor units, it is at least one to be in refrigerating operaton and all
The total capacity of indoor unit in heating operation is more than the total capacity and driving circuit of all indoor units in refrigerating operaton
In the case that the temperature of plate 10 meets third condition, if the aperture of the third throttling set in the second indoor unit is more than the first setting
Aperture then reduces the aperture of the third electric expansion valve 12 in the second indoor unit.Wherein, the second indoor unit is is in indoor unit
Any of refrigerating operaton, the third electric expansion valve 12 as reduced No. three indoor units 203 in Fig. 5；For the first time, above-mentioned the
Three conditions are more than third threshold value and less than second threshold including this temperature or the temperature of last time；In n-th (n >=2), third
Condition includes this temperature and is more than third threshold value more than the temperature of last time and this temperature or the temperature of last time and is less than
Second threshold.
With reference to Fig. 7, the control method of the connected machine of the present embodiment is further detailed.
The temperature T of drive circuit board 10 is obtained when first time, is i.e. during n=1, is more than the in the temperature T of drive circuit board 10
One threshold value and less than the second electric expansion valve 9 of aperture or increase in the case of second threshold, reducing the first electric expansion valve 8
Aperture or reduce the first electric expansion valve 8 aperture simultaneously increase the second electric expansion valve 9 aperture；In drive circuit board
In the case that 10 temperature T is more than second threshold, compressor shutdown protection.
When n-th obtains the temperature T (n) of drive circuit board 10, i.e. during n >=2, it is more than the temperature of last time in this temperature
Degree, this temperature T (n) reduce opening for the first electric expansion valve 8 more than first threshold and less than in the case of second threshold
It is swollen that the aperture of the first electric expansion valve 8 of aperture or reduction of the second electric expansion valve 9 of degree or increase increases the second electronics simultaneously
The aperture of swollen valve 9.
It is at least one in heating operation in multiple indoor units while adjusting, it is at least one in refrigerating operaton,
And the total capacity of all indoor units in refrigerating operaton is more than the total capacity of all indoor units in heating operation, Yi Jiben
In the case that secondary temperature is more than third threshold value and is less than second threshold, if third electric expansion valve 12 opens in the first indoor unit
Degree is more than the first setting aperture, reduces the aperture of third electric expansion valve 12 in the first indoor unit；Or in multiple indoor units extremely
Few one is in heating operation, at least one in refrigerating operaton, and the total capacity of all indoor units in heating operation is big
It is more than third threshold value and less than second threshold in the total capacity of all indoor units in refrigerating operaton and this temperature
In the case of, if the aperture of the third electric expansion valve 12 in the second indoor unit is more than the first setting aperture, reduce the second indoor unit
The aperture of interior third electric expansion valve 12.
Optionally, each threshold value in the present embodiment, setting interval time, first setting aperture, second setting aperture with
Value in embodiment 1 can be identical, and details are not described herein again.
Embodiment 3
The present embodiment is a kind of connected machine, and including at least one outdoor unit, (indoor unit can be for one or more
It is a), multiple indoor units and the heat exchange major loop for connecting outdoor unit and multiple indoor units, be equipped with compressor in outdoor unit,
And outdoor unit includes the first throttling device being arranged on heat exchange major loop and the heat exchange branch in parallel with first throttling device
Road, the heat exchange branch include cooling heat exchanger and second throttling device, and cooling heat exchanger is used to cool down the driving electricity of compressor
Road plate；Temperature sensor and controller are further included, wherein, temperature sensor is arranged on the drive circuit board of compressor, is used for
Detect the temperature of drive circuit board；Controller is used to obtain the temperature of drive circuit board from temperature sensor.From temperature sensor
After the temperature for getting the drive circuit board of compressor, other analysis and Control functions of controller can be found in embodiment 1 and implement
The content of control method in example 2, details are not described herein again.
Above-mentioned controller can be central processing unit (Central Processing Unit, CPU), field-programmable
Gate array (Field Programmable Gate Array, FPGA) or other programmable logic device, transistor logic device
Part, hardware component or its arbitrary combination.The controller is usually properly termed as control panel, master board etc., exemplary, Ke Yian
Loaded in outdoor unit；Control module can also include the control panel being installed in control panel and outdoor unit in indoor unit, the two
The control function of connected machine provided in an embodiment of the present invention is realized in communication connection jointly.
The above description is merely a specific embodiment, but protection scope of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in change or replacement, should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (11)
1. a kind of connected machine, including outdoor unit, multiple indoor units and for connecting the outdoor unit and multiple rooms
The heat exchange major loop of interior machine, the outdoor unit is interior to be equipped with compressor, and the outdoor unit includes and is arranged on the heat exchange major loop
On first throttling device and the heat exchange branch in parallel with the first throttling device, it is described heat exchange branch include cool down
Heat exchanger and second throttling device, the cooling heat exchanger are used to cool down the drive circuit board of the compressor, which is characterized in that
It further includes：
Temperature sensor, the temperature sensor are arranged on the drive circuit board of the compressor, for detecting the driving
The temperature of circuit board；
Controller, the controller are used to obtain the temperature of the drive circuit board from the temperature sensor；And described
In the case that temperature meets first condition, reduce the aperture of the first throttling device and/or the increase second throttling device
Aperture；
Wherein, the first condition includes the temperature and is more than first threshold；Or it is more than first threshold including the temperature
It is worth and less than the second threshold.
2. connected machine according to claim 1, which is characterized in that the controller is specifically used for：With setting time
Interval repeatedly obtains the temperature of the drive circuit board that the temperature sensor detects.
3. connected machine according to claim 2, which is characterized in that in n-th, the first condition further includes this
The temperature be more than last time the temperature, n >=2.
4. connected machine according to claim 2, which is characterized in that included in the indoor unit and be arranged on the heat exchange
Third throttling set on major loop；
The control implement body is additionally operable to：It is at least one in heating operation in multiple indoor units, it is at least one to be in
Refrigerating operaton, and the total capacity of all indoor units in refrigerating operaton is more than all in the interior of heating operation
In the case that the total capacity of machine and the temperature meet second condition, if the third throttling set in the first indoor unit
Aperture be more than the first setting aperture, then reduce the aperture of third throttling set in first indoor unit, described first is indoor
Machine is any in the indoor unit in heating operation；
Wherein, at the 1st time, the second condition includes：This temperature or the temperature of last time are more than third threshold value,
Or this temperature or the temperature of last time is more than the third threshold value and less than the second threshold；
In n-th, the second condition includes：This temperature is more than the temperature of last time, further includes：This institute
It states temperature or the temperature of last time is more than the third threshold value, alternatively, this temperature or the temperature of last time are big
In the third threshold value and less than the second threshold；Wherein, the third threshold value is more than the first threshold.
5. connected machine according to claim 4, which is characterized in that the controller is specifically used for：If described first
The aperture of third throttling set in indoor unit is more than the described first setting aperture, then by the third section in first indoor unit
It flows device and reduces the second setting aperture.
6. connected machine according to claim 2, which is characterized in that included in the indoor unit and be arranged on the heat exchange
Third throttling set on major loop；
The control implement body is additionally operable to：It is at least one in heating operation in multiple indoor units, it is at least one to be in
Refrigerating operaton, and the total capacity of all indoor units in heating operation is more than all in the interior of refrigerating operaton
In the case that the total capacity of machine and the temperature meet third condition, if the third throttling set in the second indoor unit
Aperture be more than the first setting aperture, then reduce the aperture of third throttling set in second indoor unit, in the second Room
Machine is any in the indoor unit in refrigerating operaton；
Wherein, at the 1st time, the third condition includes：This temperature or the temperature of last time are more than third threshold value,
Or this temperature or the temperature of last time is more than the third threshold value and less than the second threshold；
In n-th, the third condition includes：This temperature is more than the temperature of last time, further includes：This institute
It states temperature or the temperature of last time is more than the third threshold value, alternatively, this temperature or the temperature of last time are big
In the third threshold value and less than the second threshold；Wherein, the third threshold value is more than the first threshold.
7. connected machine according to claim 6, which is characterized in that the controller is specifically used for：If described second
The aperture of third throttling set in indoor unit is more than the described first setting aperture, then by the third section in second indoor unit
It flows device and reduces the second setting aperture.
8. a kind of control method of connected machine, the connected machine includes outdoor unit, multiple indoor units and for even
Lead to the heat exchange major loop of the outdoor unit and multiple indoor units, compressor, and the outdoor unit are equipped in the outdoor unit
Include the first throttling device and the heat exchange branch in parallel with the first throttling device being arranged on the heat exchange major loop
Road, the heat exchange branch include cooling heat exchanger and second throttling device, and the cooling heat exchanger is used to cool down the compression
The drive circuit board of machine, which is characterized in that the control method includes：
Obtain the temperature of the drive circuit board；
In the case where the temperature meets first condition, reduce the aperture of the first throttling device and/or increase described the
The aperture of two throttling sets；
Wherein, the first condition includes the temperature and is more than first threshold；Or including：The temperature be more than first threshold and
Less than second threshold.
9. the control method of connected machine according to claim 8, which is characterized in that described to obtain the driving circuit
The temperature of plate includes：
The temperature of the drive circuit board is repeatedly obtained with setting time interval.
10. the control method of connected machine according to claim 9, which is characterized in that include and set in the indoor unit
Put the third throttling set on the heat exchange major loop；
It is at least one in heating operation in multiple indoor units, it is at least one to be in refrigerating operaton and all in system
The total capacity of the indoor unit of cold operation is more than the total capacity of all indoor units in heating operation and the temperature
In the case that degree meets second condition, if the aperture of the third throttling set in the first indoor unit is more than the first setting and opens
Degree, then reduce the aperture of the third throttling set in first indoor unit, and first indoor unit is to be transported in heating
Any in the capable indoor unit；
Wherein, at the 1st time, the second condition includes：This temperature or the temperature of last time are more than third threshold value,
Or this temperature or the temperature of last time is more than the third threshold value and less than the second threshold；
In n-th, the second condition includes：This temperature is more than the temperature of last time, further includes：This institute
It states temperature or the temperature of last time is more than third threshold value, alternatively, this temperature or the temperature of last time are more than institute
State third threshold value and less than the second threshold；Wherein, the third threshold value is more than the first threshold.
11. the control method of connected machine according to claim 9, which is characterized in that include and set in the indoor unit
Put the third throttling set on the heat exchange major loop；
It is at least one in heating operation in multiple indoor units, it is at least one to be in refrigerating operaton and all in system
The total capacity of the indoor unit of heat operation is more than the total capacity of all indoor units in refrigerating operaton and the temperature
In the case that degree meets third condition, if the aperture of the third throttling set in the second indoor unit is more than the first setting and opens
Degree, then reduce the aperture of the third throttling set in second indoor unit, and second indoor unit is to be transported in refrigeration
Any in the capable indoor unit；
Wherein, at the 1st time, the third condition includes：This temperature or the temperature of last time are more than third threshold value,
Or this temperature or the temperature of last time is more than the third threshold value and less than the second threshold；
In n-th, the third condition includes：This temperature is more than the temperature of last time, further includes：This institute
It states temperature or the temperature of last time is more than the third threshold value, alternatively, this temperature or the temperature of last time are big
In the third threshold value and less than the second threshold；Wherein, the third threshold value is more than the first threshold.
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| CN201711447901.5A CN108195099B (en) | 2017-12-27 | 2017-12-27 | Variable frequency multi-split air conditioner and control method thereof |
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| CN109611991A (en) * | 2018-12-19 | 2019-04-12 | 宁波市海智普智能科技有限公司 | Kitchen bathroom integrated air conditioner unit and its control method |
| CN109611990A (en) * | 2018-12-19 | 2019-04-12 | 宁波市海智普智能科技有限公司 | A kind of high-efficiency and energy-saving type kitchen bathroom integral multifunctional air-conditioner set and its control method |
| CN109737632A (en) * | 2018-12-19 | 2019-05-10 | 宁波工程学院 | High-efficiency and energy-saving type kitchen bathroom integrated air conditioner unit and its control method |
| CN109737633A (en) * | 2018-12-19 | 2019-05-10 | 宁波工程学院 | A kind of kitchen bathroom integral multifunctional air-conditioner set and its control method |
| CN110793151A (en) * | 2019-11-19 | 2020-02-14 | 宁波奥克斯电气股份有限公司 | Multi-split refrigerant control method and device, air conditioner and storage medium |
| CN111237973A (en) * | 2020-01-19 | 2020-06-05 | 珠海格力电器股份有限公司 | Air conditioner heat dissipation control system and method and air conditioning equipment |
| CN111256205A (en) * | 2020-01-19 | 2020-06-09 | 珠海格力电器股份有限公司 | Air conditioner heat dissipation control system and method and air conditioning equipment |
| CN111811170A (en) * | 2020-09-14 | 2020-10-23 | 宁波奥克斯电气股份有限公司 | Control method and system for electronic expansion valve of multi-connected indoor unit and multi-connected indoor unit |
| CN115978818A (en) * | 2022-12-22 | 2023-04-18 | 江苏拓米洛高端装备股份有限公司 | Control method and control device of environmental test equipment |
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| CN111811170A (en) * | 2020-09-14 | 2020-10-23 | 宁波奥克斯电气股份有限公司 | Control method and system for electronic expansion valve of multi-connected indoor unit and multi-connected indoor unit |
| CN111811170B (en) * | 2020-09-14 | 2021-01-22 | 宁波奥克斯电气股份有限公司 | Control method and system for electronic expansion valve of multi-connected indoor unit and multi-connected indoor unit |
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