Owner`s Manual AMR03Y
Contents
1. Chart 1 I amp O manual e m m m m m mm um um Gm um Gm Gm Gm mo Gm mm Guo Um Gm Guo Gm Ge GE Gm Gu Gm m GE Ge Gm Go Gm Ge GE GU Gm Go GE m GM Get Gus Gm m GM Ge Gm Gm GG Ge Gm GU GG GM GU Ge GU Gm m GE GU Ge GU GE m GU Ge GU Gm m GR Gm Ge GE m GE GR Gm GE m OG Gm GE m GR m GU GE Gab GE GU Gm GE GU GE GR m GE GU GR Ge GU GE GR Gm GO GE m Go Gm GU GE m GE GR Gm GO GE GU GE GU Ge GU GE GU GR Ge GE x x Ld RS232 Pin hole for connection to computer COM port qaqa D DHLD Matching resistance of communication e2. 1 The locking status of the remote controller can be locked or unlocked by the computer or centralized controller separately The locking status of the centralized controller is memorized after power failure of the centralized controller and will not vanish after the power supply is restored unless the command of unlocking is received Mode locking function After the mode locking command is received the command is forwarded to the air conditioner and the centralized controller displays the mode locking flag After the command of unlocking is received the non conflict mode can be selected freely The centralized controller can also lock modes of all indoor units Emergent shutdown and compulsory startup When the emergent shutdown switch of the centralized controller is turned on all air conditioners in the network of the centralized controller will shut down compulsorily The centralized controller and computer and all functional modules are disabled from startup and shutdown until the foregoing switch is turned off When the compulsory startup switch of the centralized controller is turned on all air conditioners in the network of the centralized controller will start up compulsorily By default they will run in the cooling mode The startup and shutdown operations of the centralized controller and the computer and all functional modules will be disabled only the command of startup is sent to the air conditioner without affe
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5. 10 Fan key In setting operation mode press this key to set the fan of the indoor unit of the air conditioner to run in the automatic high medium or low level of air auto low medium high Time on key In setting operation mode press this key to set the timing startup of air conditioner press the key again to exit the timing setting and restore the normal temperature regulation operation mode time on set temperature regulation Time off key In setting operation mode press this key to set the timing shutdown of air conditioner press the key again to exit the timing setting and restore the normal temperature regulation operation mode time on set temperature regulation owing key In setting operation mode press this key to enable or disable the swing function If all currently selected air conditioners have no swing function no effect will result after pressing the key Leftward key In the query mode every time when you press the key the operation status data of the previous air conditioner will be displayed If it is currently on the first machine press the key again and the data of the last machine will be displayed If you hold down this key the address will decrease one by one In the setting mode every time when you press the key if it is in single operation mode the air conditioner of the previous in service address number will be selected If it is in the global
6. check whether the trial run is normal and deliver the user s manual to the user N N C Warning LJ System wiring instruction 1 Wiring diagram of building network air conditioning system Wiring diagram with good Wiring diagram with poor communication effect communication effect not recommended because it may lead to poor communication 2 System wiring diagram of centralized monitoring and indoor unit of air conditioner Both of the following wiring modes of centralized monitor and indoor unit are applicable Quantity of indoor units connected with each centralized monitor is less than or equal to 64 Indoor unit Indoor unit Indoor unit Indoor unit Indoor unit Indoor unit e PS K Er Centralized controller Indoor unit Indoor unit Indoor unit Indoor unit Indoor unit Indoor unit N m N N Centralized controller B Basic conditions of operating the electric controller Please entrust the distributor or professionals to install the Adhere to this installation manual Improper installation may lead Reinstallation must be performed by professionals Improper Do not uninstall the equipment without permission Unauthorized equipment Installation by unauthorized persons may lead
7. of centralized controller The size of the centralized controller wire depends on the length Use a wiring pipe adaptable to the wires of the centralized controller to perform installation Insert the flathead screwdriver into the concave on the upper side of the box and rotate slightly to open the upper cover of the centralized controller m Wiring procedure see in Chart 2 Network air conditioner wiring diagram two types for indoor unit 1 The main control board needs an external network interface module 2 Network interface module is built in the main control board Q NOTE The RS485 to RS232 module in the wiring diagram and the wires are put into use only when the network system needs to be connected with the computer One computer can be connected with 16 centralized monitors as a maximum Namely a maximum of 16X64 1024 indoor units can be connected The centralized controllers are differentiated by address bits The configurable range is 0 15 No duplicate address of centralized controller is allowed in a unified network E Safety precautions Read the safety precautions carefully before installing the unit Stated below are important safety issues that must be obeyed The meanings of all parts are as follows Means improper handling may lead to Warning personal injury or property loss Means improper handling may lead to personal death or severe injury Upon completion of the installation
8. operation mode no effect will result after the key is pressed In the main page press the key to enter the query mode By default it is the first in service air conditioner Rightward key In the query mode every time when you press the key the operation status data of the last air conditioner will be displayed If it is currently on the last machine press the key and the data of the first machine will be displayed If you hold down this key the address will increase one by one In the setting mode every time when you press the key if it is in the single operation mode the air conditioner of the next in service address number will be selected If it is in the global operation mode no effect will result after the key is pressed In the main page press the key to enter the query mode By default it is the first in service air conditioner Downward key In the query mode every time when you press the key the operation status data of the air conditioner corresponding to the next row of the matrix will be displayed If it is currently in the last row press the key and the data of the air conditioner corresponding to the first row will be displayed If you hold down this key the row will increase one by one In the setting mode every time when you press the key if it is in the single operation mode the air conditioner corresponding to the last row will be selected If it is in the global operation mode no effect will result afte
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10. a YORK lt lt ENGLISH UG AMROSY E OWNER S MANUAL THE 2ND GENERATION CENTRALIZED CONTROLLER AMRO3Y Please read this installation manual carefully before installing your air conditioner Please keep this manual in a safe place for future reference This manual many be subject to change without notice for purpose of improvement Applicable model AMR03Y E CONTENT l Installation part E Packing list and precautions E Notes to installation B installation procedure E Wiring procedure B Safety precautions B System wiring instruction Il Operation part E Basic conditions of operating the electric controller B Function categories of electric controller E Functions of components e System composition e Keywords and general function description e Schematic diagram of centralized controller keys e Electric control function description Keypad operation instruction e General display data entries e LCD display description e Fault and protection code table B Technical indices and requirements CT 8 1 9 LT 10 aa 11 Chart5 LCD full display diagram Chart 6 7 8 9 m Thank you for your confidence in YORK YORK 2nd Generation Centralized Controller H This specification manual describes the conditions of operating the centralized controller and its control functions This specification manual is applicable to centralized controllers But the functions available from the centralized controller described herein or the
11. cting operation of the remote controller after startup until the foregoing switch is turned off If the foregoing two switches are turned on concurrently the emergent shutdown switch shall have preference Electric controller function description Keypad operation description see in Chart 4 Query key Any time when you press the key the selected operation mode is to query the operation status of the air conditioner By default the first in service air conditioner will be queried Through the Increase and Decrease keys you can change the parameter page to be queried through the Up Down Left and Right keys you can change to query status of other in service air conditioners 2 Set key 3 In other display mode press the key to enter the setting mode By default it is single setting and the first in service air conditioner is displayed In setting operation mode press the key again and the operation will be performed for all air conditioners in the network Press the key repeatedly to shift between single setting and global setting Single Global Po Mode key In setting operation mode press this key to set the operation cooling heating supply air only stop gt In other display mode press the key to enter the setting mode By default it is single machine setting and the first in service air conditioner is displayed I amp O manual 3 4 5 6 T 8 9
12. displayed data need support of the main control board of the air conditioner o For convenience of future reference keep this manual properly after reading it m For any question contact the distributor l Installation part Si List of fittings and precautions 1 Packing box list of 2nd generation indoor unit centralized controller AMRO3Y Check whether the assemblies are complete Serial Name Quantity Remarks qum nad 24 generation indoor 1 PCS AMRO3Y E unit centralized 6 PCS GB845 ST3 8X25 C H iE Fastening plastic 6 PCS 6X30 expansion pipe YDSO6IU 012a Installation amp 1 PCS Operation Manual 2 PCS 120 ohms 2 Fastening cross groove pan head self tapping screw Matching resistance 2 Installation assemblies prepared on the site Serial Name Quantity Selected Install into model No wall 3 core control 2 PCS RVVP shielded cable 300 300 3x0 75mm Remarks One for communicating with network interface module the other for communicating with the computer 3 core cable 1 PCS RVV 300 500 For power supply 3x1 5mm of monitor Switch box 1 PCS 1 3 EMEN NN 4 Wire pipe jack 2 3 PCS casing pipe captive nut ee 5 Tighten strip Several For binding cables as Ei Notes to installation the case may be Notes to installation of centralized controller 1 Power supply of the centralized controller Connect the 220V 50Hz power supply to the L and N sides of the term
13. e air conditioners in the network The centralized controller can be interfaced with computer or gateway to implement centralized control and status query for all air conditioners in the network It can be connected with WAN via computer or gateway to implement remote computerized control with support of computer software Each local computer or gateway can be connected to 16 centralized controllers as a maximum The master slave answer mode is implemented for communication between the centralized controller and the air conditioner between the computer and the centralized controller In the LAN composed of centralized controller and air conditioner the centralized controller is a master and the air conditioner is a slave In the LAN composed of computer and centralized controller the computer or gateway is a master and the centralized controller is a slave Schematic diagram of network control system composi tion of air conditioner see in Chart 3 Keywords and general function description Power on or reset When the centralized controller is powered on or reset all display segments of the LCD are luminous for 2 seconds and then goes off 1 second later the system enters the normal display status The centralized controller is in the main page display status and displays the first page and searches the in service air conditioners in the network Once the search is finished the centralized controller enters the mode settin
14. ed in graphics Otherwise no data is displayed e n normal operation of the centralized controller the periodical cycle module communicates with the network interface module and the data is displayed dynamically and cyclically blank f In the centralized control locked status or the keypad locked status the locking flag is displayed After unlocking it is not displayed In the centralized controller locked status the flag blinks at 0 5Hz in the keypad locked status the flag is displayed constantly If both of them are locked concurrently the flag is displayed constantly g In the setting page if the selected air conditioner is in the remote controller locked status in case of non single machine operation as long as one machine is in the remote controller locked status it is deemed the locked status the flag is displayed constantly h Ifall indoor units lock the cooling mode this flag will display if all indoor units lock the heating mode this flag will display Data display handling 1 Indoor unit code address display Display range 00 63 with being luminous concurrently 2 Indoor temperature display Display range 00 99 C C and indoor temperature are displayed concurrently If the temperature is higher than 99 C 99 C is displayed If the temperature value is invalid is displayed 3 If timing startup shutdown is set the flag is displayed 4 T3 T2A and T2B display In the s
15. end the currently selected mode status and the auxiliary function status to the selected air conditioner and display the mode setting operation results After you select the operation mode and auxiliary function status information of the air conditioner if you do not press the confirmation key the selected information will not be sent to the air conditioner and will not affect the current operation of the air conditioner The operations of remote controller locking and unlocking need no pressing of the confirmation key The command information is sent directly after the locking key is pressed 17 Reset key 2 Anytime when the reset key is pressed the centralized controller will reset The result is the same as the result of restoring power on after power failure General display data entries General display data is displayed in all display pages a Under the interconnected control of the computer or gateway the data is displayed in graphic Otherwise no data is displayed b If the centralized controller is connected with the functional module for communication the data is displayed in graphics Otherwise no data is displayed c f the centralized controller is connected with the SMS remote control module for communication the data is displayed in graphics Otherwise no data is displayed d If the centralized controller is connected with the telephone remote control module for communication the data is display
16. g page and sets the first in service air conditioner by default Network area address of centralized controller The local computer or gateway can be connected with 16 centralized controllers for communication Each centralized controller serves as an area of the air conditioner network The centralized controllers are differentiated by bit selection address The configurable range is 0 15 State indication If any local keypad operation is setting the operation status of the air conditioner the indicator is on when the signals are sent Upon completion of the setting process the indicator goes off If an in service air conditioner in the network is faulty or the centralized controller network itself is faulty the indicator will blink at 2Hz If one or more in service air conditioners in the network are running including under setting of timing start shutdown the indicator will be luminous Otherwise the indicator is off Locking of centralized controller After receiving the centralized controller locking command sent from the computer the centralized controller disables the startup shutdown and setting of the air conditioner and sends commands to lock remote controllers of all air conditioners in the network of the centralized controller After receiving the unlocking command the centralized controller enables the startup shutdown operation and sends commands to unlock the remote controller of all air conditioners 6
17. inal on the back of the centralized controller 2 Do not place the signal cable and power cable of the central ized controller into the same wire pipe An interval of 300 500mm should exist between the two pipes 3 The main signal cable of the centralized controller shall not exceed 1200m 4 No intermediate joint is allowed for the shielded cable If joints are inevitable crimp it with the terminal 5 After the centralized controller is connected do not use megohmmeter to inspect insulation of the signal cable 6 Wiring mode of the centralized controller and the network interface The communication port between the centralized controller and the network interface of the air conditioner is polarity sensitive The X Y and E at both sides should correspond properly Dot not cross connect cables The same principles apply to the RS485 RS232 of the centralized controller Incorrectconnection Incorrectconnection U lt peH U Oj l P lt 0G eO ole O a ss gt lt gt HOG my elo gt DI p o 0 HH ee m m m m m m m om om um um Gm Gm Gm ee eee eee eee eee eee eee I amp O manual 1 m Installation procedure see in Chart 1 l Procedure of installing electrician switch box
18. ingle machine query page display can shift between T3 T2A and T2B and the temperature value is displayed concurrently with the corresponding C being luminous 5 In case of air conditioner fault or protection the corresponding fault code or protection code can be displayed I amp O manual 6 Liquid crystal matrix display description see in Chart 5 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 1 The liquid crystal matrix is composed of 4 64 grids and each grid is composed of two blocks of different sizes as shown in the above figure 2 The matrix includes horizontal coordinates 00 15 on the upper side and vertical coordinates 00 16 32 and 48 on the left side which indicate the address of the indoor unit The sum of the horizontal coordinate and the vertical coordinate of the grid is the address of the grid Each grid corresponds to an indoor unit of this address 3 One grid is composed of two blocks of different sizes The status indication table is as follows Slow Fast Constantly on f blink blink Big black Out of In service Selected block service Fault of Power Power on indoor B unit LCD display description see in Chart 6 1 Description of the standby page 1 The LCD displays the standby page 60 air conditioners are in service of which 28 are powered on and 32 off 2 In the matrix the big dots of 00 16 and 15 32 are luminous and the small dots are n
19. lized controller and network interface module Fault of communication between network interface module and main control board I amp O manual Protection ss Protection content Description code PD Reserved SS PB IFesered P9 jReseved S P8 Overcurrentofcompressor Discharge low pressure protection Discharge high pressure protection P6 Discharge pipe temperature protection Condenser high temperature protection Anti cool air or defrost protection Po Evaporator temperature protection p7 Power supply over voltage and under voltage protection E Technical indices and requirements 1 EMC and EMI comply with the CE certification requirements 2 The electric safety complies with the requirements of GB4706 32 2004 and GB T7725 2004 I amp O manual Installation dimensions As shown in the figure on the right side 1456 Installation screw holes 4 holes Rotate the flathead screwdriver slightly to open the upper cover at points Screws for fixing the centralized controller GB845 ST3 9 25 Holder Address bits Bit location Address range Ly P l j 00 15 Upper cover gemee g de N Power cable interface of centralized controller 198V 242V 50 60HZ sto start switch switch Communication interface with computer Communication interface withindoor interface
20. nd gas pipework may then be disconnected and removed For points of connection refer to unit installation instructions Remove all refrigerant from each system of the unit into a suitable container using a refrigerant reclaim or recovery unit This refrigerant may then be re used if appropriate or returned to the manufacturer for disposal Under No circumstances should refrigerant be vented to atmosphere Where appropriate drain the refrigerant oil from each system into a suitable container and dispose of according to local laws and regulations governing disposal of oily wastes Packaged unit can generally be removed in one piece after disconnection as above Any fixing down bolts should be removed and then unit lifted from position using the points provided and equipment of adequate lifting capacity Reference MUST be made to the unit installation instructions for unit weight and correct methods of lifting Note that any residual or spilt refrigerant oil should be mopped up and disposed of as described above After removal from position the unit parts may be disposed of according to local laws and regulations Johnson oe Controls UG AMROSY E eee
21. nd is 1209 RS485 Converted RS232 module F One centralized controller can be connected to 64 indoor units as a maximum O Geico AAT i One centralized controller can be connected to 64 indoor units as a maximum One centralized controller can be connected to 64 indoor units as a maximum Centralized controller One centralized controller can be connected to i 64 indoor units as a maximum Chart 2 I amp O manual w m m m um Gm Gm Gm Gm Gm Gm Gm Gm Gm Gm Gm Guo Guo Gm Gm Guo Gm Gm Gm Guo Guo Guo Gm Gm Gm GE Gm Gm Guo Gu GE GEB Gm GE Guo Gu x Gm Gm GE Gm GE Gu x Gm Guo Gm x Gm Go Gm Gus x GE GE Gu Go Gm x Gu GE Gm Gm Gm x x GE Gm Gm Gm Gm Gm Gm Gm m Gm Gm m mo momo Centralized controller Local computer gt aM i AZ ET N EIE EE FEN The network interface may be integrated into the indoor unit or main control board E lt a l A maximum of 64 pieces m m m um Gm Gm Gm um um Guo Guo Gu Gm Gm mm mm m m Guo Gm eee x x EM x x x x x x x x c r d Chart 3 LIC X E E NE E M ETIN SI LISX12223012
22. ot luminous It indicates the 32 air conditioners with the addresses from 16 to 47 are powered off 3 Inthe matrix the big and small dots of 09 48 and 12 48 are not luminous It indicates the four air conditioners with the addresses from 57 to 60 are outside the network 4 All other big and small dots in the matrix are luminous It indicates all other air conditioners are in the network and powered on 5 The address of the air conditioner is sum of the coordinates For example the address of 09 48 is 09 48 57 6 The centralized controller keypad is locked and the centralized controller communicates with the computer normally Description of the query page see in Chart 7 1 TheLCD displays the query page and the air conditioner with the address of 08 is being queried Mode of the air conditioner with the address 01 is Cooling strong air swing on indoor temperature 22 C set temperature 20 C cooling mode lock 2 Inthe matrix only the big and small black dots at 00 00 and 01 007 are luminous It indicates the in service and power on status of the air conditioners with the addresses of 00 and 01 3 Thecentralized controller communicates with the computer normally Description of the setting page see in Chart 8 1 The LCD displays the setting page and queries the air conditioner with the address of 08 The mode of the air conditioner with the address 08 is Cooling strong air swing on indoor
23. power off status press the key to perform the startup operation If it is in the mode setting page currently and the parameters such as startup mode temperature and air speed are selected the air conditioner will be started according to the selected parameters If no mode is selected currently and the air conditioner is powered off or it is in other display page currently and the default startup mode is Cooling strong air set temperature 24 C swing function enabled The default startup mode is locked according to the system mode or judged according to other constraint conditions If any conflict exists the next conflict free mode will apply automatically If conflict exists for all modes startup will be impossible If one or more in service air conditioners in the network including in the timing process of timing startup shutdown pressing this key will shut down all air conditioners When performing the shutdown operation the shutdown command is issued to the air conditioners in the startup status only and is not issued to those in the shutdown status Lock key In the mode setting mode press the Lock key and the remote controller of the currently selected air conditioner will be locked unlocked The operation mode is If you select single machine setting the operation is performed for the air conditioner of the current address only If the remote controller of the air conditioner is locked currently issue the lock command other
24. pper level set time if no time is set 0 0 will be displayed if you hold down the key the upper level data will be selected consecutively The specific change mode is as follows gt 7 5 8 0 8 5 9 0 9 5 10 11 12 13 14 15 16 17 18 19 1520521222324 13 Reduce key In the main page or the query mode every time when you press a key the data of the current page will be displayed If itis now in the first page press the key again and the last page will be displayed In the setting mode every time when you press the key if it is in the temperature regulation mode the set temperature will decrease by 1 degree until the lowest allowed set temperature if it is in the timing startup shutdown time setting mode select the upper level set time if no time is set 0 0 will be displayed if you hold down the key the upper level data will be selected consecutively The specific change mode is as follows 0 0 5 1 0 1 7 0 7 5 lt 8 0 lt 8 5 9 0 9 5 10 11 12 13 14 15 16 17 18 lt 1 9 20 21 22 23 24 I amp O manual 14 ON OFF key 15 16 Any time when you press the key the centralized startup shutdown operation is performed for all current in service air conditioners in the centralized controller network If all in service air conditioners in the network are in the
25. r the key is pressed In the main page press the key to enter the query mode By default it is the first in service air conditioner 11 12 0 0250 5 51 0 51 5 52 052 5 53 0 53 5 54 0 54 5 55 0 55 5 56 0 6 5 7 0 Upward key In the query mode every time when you press the key the operation status data of the air conditioner corresponding to the previous row of the matrix will be displayed If it is currently in the first row press the key and the data of the air conditioner corresponding to the last row will be displayed If you hold down this key the row will decrease one by one In the setting mode every time when you press the key if it is in the single operation mode the air conditioner corresponding to the previous row will be selected If it is in the global operation mode no effect will result after the key is pressed In the main page press the key to enter the query mode By default it is the first in service air conditioner Add key In the main page or the query mode every time when you press the key the data of the last page will be displayed If it is now in the last page press the key again and the first page will be displayed In the setting mode every time when you press the key if it is in the temperature regulation mode the set temperature will decrease by 1 C until the highest allowed set temperature if it is in the timing startup shutdown time setting mode select the u
26. temperature 28 C set temperature 22 C cooling 2 Inthe matrix only the big black dots from 08 00 to 16 00 are luminous It indicates the air conditioners with the addresses from 08 to 16 are in service 3 The centralized controller communicates with the computer normally 4 Fault page display description see in Chart 9 1 Query the air conditioner with the address of 08 in the query page The air conditioner with the address of 08 is faulty and the fault code is 08 The big black dot below 08 0 blinks 2 Inthe matrix only the big and small black dots from 00 00 to 16 15 illuminate It indicates the in service status of the air conditioners with the addresses of 00 and 01 3 The centralized controller communicates with the computer normally Fault and protection code table EF Otherfauts _ EE Water level detection faults ED Outdoor unit fault protection EC EB Over current of compressor 4 times gt Fault of communication between main board and display board Air speed detection out of control EEPROM error temperature sensor fault Communication fault Phase order error or phase loss 9 E8 E7 E6 E5 E4 E3 E2 E1 E0 07 06 05 04 03 2 0 Fault of communication between 01 centralized controller and computer gateway Fault of communication between 00 I centralized controller and functional module Fault of communication between centra
27. to imperfect installation which may result in electric shock or fire to electric shock or fire installation may lead to electric shock or fire uninstalling may lead to abnormal operation heating or fire of the air conditioner Q Note Do not install the equipment in a place vulnerable to leakage of The wiring shall adapt to the current of the centralized monitor flammable gases Once flammable gases are leaked and left around the centralized monitor fire may occur Otherwise electric leakage or heating may occur and result in fire 1 Applicable range of supply voltage Input voltage Single phase 198V 242V AC input power supply frequency 50Hz 60Hz compatible 2 Operating environment temperature of electric controller 15 C 43 C Operating environment RH of electric controller RH40 RH90 B Function categories of electric controller Functions of the electric controller 1 System composition 2 Keywords and general function description 3 Description of electric control functions of centralized controller 4 Technical indices and requirements E Function description ofeach part I amp O manual 2 System composition The centralized controller is used to perform centralized control and data query for the network air conditioner Each centralized controller can communicate with a maximum of 64 air conditioners to make up an air conditioner LAN and implement centralized monitoring for th
28. wise send the lock command If you does not select the single machine mode and the remote controller of one or more currently selected air conditioners is locked issue the unlock command if the remote controllers of all currently selected air conditioners are in the non locked status issue the remote controller lock command When the remote controller of the air conditioner is locked the air conditioner does not receive remote control signals from the remote controller or wire controller until the remote controller is unlocked Press the Query key and then press the Lock key and the keys of the centralized controller will be locked or unlocked If the keys are currently locked press the foregoing keys concurrently again and the keys will be unlocked if the keys are currently unlocked press the foregoing keys concurrently and the keys will be locked If the keys are locked pressing of any key other than the Unlock key will be ineffective In the unified setting page press the Up key and the Lock key concurrently to lock all air conditioner modules in the network The mode locking is cancelled when the key is pressed again Note When you lock or cancel locking the corresponding icon indication appears or disappears only after all the attached air conditioners are set completely so it takes a time period When the number of attached air conditioners is high wait patiently Confirmation key In the setting mode press the key to s
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