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Multi Air Conditioner SVC MANUAL(General)

1. Is inverter PCB assembly normal Yes Recheck power and installation condition Copyright 2007 LG Electronics Inc All right reserved 98 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting Display code Cause of error Check point amp Normal condition 1 Overload operation Pipe clogging Covering EEV defect Ref overcharge 2 Compressor damage Insulation damage Motor damage 3 Input voltage abnormal L N 4 Power line assemble condition abnormal 5 Inverter PCB assembly Damage input current sensing part Inverter PCB input current is over100A peak for 2us AC Input Instant over Current Error E Error Diagnosis and Countermeasure Flow Chart 1 Check Pipe clogging distortion No 2 Check Covering Indoor Outdoor Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure gt Reassemble or manage if abnormality found Is installation condition normal Yes No Check L N phase voltage is 220V 15 gt Check connection condition and wiring if power is abnormal Is input voltage normal Yes No 1 Check L N connection condition 2 Check wire disconnection and wiring gt Reassemble if abnormality found Is AC input Wire connection condition normal Yes No 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor termina
2. Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting pane Cause of error Check point amp Normal condition Malfunction of compressor Blocking of pipe Low voltage input Refrigerant pipe length blocked Over current 14A 7 Malfunction of current detection circuit C T at Initial current error Open Short Internal circuit The voltage of CO1N Is 4 0Vdc 25A 1 CTOIN Tamura re Current Trans o O 7 y 08 gt 7 ZA sf o 0 PR 1 Check Point 1 Check the power source 2 Check the fan operation is right 3 Check the current 4 Check the install condition 5 Check the internal circuit C T Diode Resistor Copyright 2007 LG Electronics Inc All right reserved 77 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting ral Cause of error Check point amp Normal condition DC Link e DC link volt is e Check the power source Low voltage 140Vdc e Check the components DC Link e DC link volt is e Check the power source High voltage 420Vdc 7 e Check the components an Check Point 26 8mH 9A 1 Check the power source 000 2 Check the components B Diode Reactor PSC Parts RBV2506 RBV1506 Copyright 2007 LG Electronics Inc All right reserved 78 Only for training and service purposes LGE Internal Use Only Display code Cause of error Press S W Open e Low High press I
3. when descending 3 Raise the Suction Grill Depress the up button 4 Then suction grill goes up and enters into the front panel Automatic stop distance 4 Stop the Suction Grill during Rising Depress the stop button Make use of this when you want to stop it at your wished posi tion 7 f Medium Automatic stop distance 1 5 0 5m 2 5 0 5m 3 5 0 5m If you want to change automatic distance setting consult with your sale agency 7 5 Defrost Control Heating e Defrost operation is controlled by timer and sensing temperature of outdoor pipe e The first defrost starts only when the outdoor pipe temperature falls below 6 C after starting of heating operation and more than 4 minutes operation of compressor e Defrost ends after 12 minutes passed from starting of defrost operation when the outdoor rises over 15 C even before 12 minutes e The second defrost starts only when the outdoor pipe temperature falls below 6 C after from ending of the first defrost and more than 4 minutes operation of compressor Copyright 2007 LG Electronics Inc All right reserved 38 Only for training and service purposes LGE Internal Use Only Part 3 Control logic ll 3 Control logic E COMMON GS Solanas id ana 40 2 DIED IFEGUENCY CONTON unit ctededocd a aaae aaa lane cede vessiatas aa 42 3 REVERSING valve ODIO iii iaai aa aeaa ENE 43 A DISCharge pipe CONTO lios iii 44 5 INDUUCUFFENT CON Tolar
4. All right reserved 126 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting pre i Cause of error Check point amp Normal condition e Check the discharge pipe sensor for INV D pipe Inverter e Check the install condition for over load temp high e Discharge sensor e Check the leakage of refrigerant o Inverter temp high e Check the Service Valve open 105 C e Check the outdoor fan D Pipe temp Toff 105 C T2 95 C T1 90 C COMP oo Momal Check Point 1 Check the install condition for over load 2 Check the Service Valve open 3 Check the outdoor fan operating condition 4 Check the leakage of refrigerant Copyright 2007 LG Electronics Inc All right reserved 127 LGE Internal Use Onl Only for training and service purposes y 5 Trouble Shooting pened Cause of error Check point amp Normal condition Transmission Error Communication Error 1 Micom defect Circuit defect Between PFC Micom gt Between PFC Micom 2 Different Micom S W Version INV Micom and INV Micom 3 ODU inverter PCB assembly damage E Error Diagnosis and Countermeasure Flow Chart Is PFC Micom amp INV Micom S W Program normal Upgrade Micom Program Is Inverter PCB assembly normal Replace inverter PCB assembly Recheck power and installation condition Copyright 2007 LG Electronics Inc All right reserved 128 Only for training and s
5. C Inverter Constant Comp Terminal comp comp U V 0 64 0 8 V W 0 64 0 8 W U 0 64 0 8 Resistance Q at 20 C Inverter Constant Terminal comp comp U GND 2MQ 2MQ V GND 2MQ 2MQ W GND 2MQ 2MQ Copyright 2007 LG Electronics Inc All right reserved 86 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting E 27 30 40k 1 Wait until inverter PCB DC voltage is discharged after main power off 2 Pull out V V W COMP connector 3 Set multi tester to resistance mode 4 If the value between P and N terminal of IPM is short 00 or open hundreds MQ PCB needs to be replaced IPM damaged 5 Set the multi tester to diode mode 6 In case measured value is different from the table PCB needs to be replaced PCB damaged PFC_IPM chei U V W gt R In case that the control box is opend and before checking electrical parts it should be checked that the LED 01M 02M turned off wait 7 minutes after main power OFF otherwise it may cause electrical shock Copyright 2007 LG Electronics Inc All right reserved 87 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting E 48 56k DOODODOOODODO0OS 0 PM DODODOODODOOODOODOODODO y Oo oO moooon ee Coono00 a DOOODO0DODDDDO F a E O EG On Poa A Os fal o o E 0 k mn J ki A A a A CN N _BLUE CN L
6. F Ey IR EAS 6 eno AE IA A ERTER PCB Connection Check gt lt IN Copyright 2007 LG Electronics Inc All right reserved 132 Only for training and service purposes LGE Internal Use Only Display Cause of error code Condenser pipe sensor temp high detected high temp 65 C e Condenser pipe sensor 5 Trouble Shooting Check point amp Normal condition e Check the load condition e Check the sensor of Condenser pipe sensor Heat sink sensor e Heat sink sensor detect e Check the Heat sink sensor 10kQ 10 at 25 C e Check that outdoor fan is driving rightly temp high ed high temp 85 C Heat Sink E SI Comp frequecy control accoding to heatsink temp E Comp frequency control according to heat sink temp Is normal heatsink sensor No connecting Yes Is normal heatsink sensor No 10kQ 10 at 25 C Yes No Is normal Inverter PCB Yes Recheck power and installation condition Copyright 2007 LG Electronics Inc All right reserved 133 Only for training and service purposes Connect the heatsink sensor right Replace the heatsink sensor Replace the heatsink sensor LGE Internal Use Only 5 Trouble Shooting e Cause of error Check point amp Normal condition Outdoor fan e Outdoor fan is not oper Check the fan condition lock ating e Check the fan connector e Check the fan control part of the INVERTER P
7. Model type W DC inverter heat pump Indicates that this is multi system outdoor unit using R410A Ex A4U Connectable max 4 indoor units A6U Connectable max 6 indoor units Copyright 2007 LG Electronics Inc All right reserved 11 Only for training and service purposes LGE Internal Use Only Part 1 General Information 3 3 Indoor Unit Europe m e 12 a LH B 3 4 Outdoor Unit Europe em 19 a H p 3 5 BD Unit Global e m Bo se 2 o Lo Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes Color of front panel MA MC model B Blue C Cherry D Wood M Metal R Mirror V Silver W White wood Type of duct indoor MB model No mark High static pressure model L Low static pressure model B Builti in model Model type C Cooling only H Heat pump Type of refrigerant A R410A Cooling heating capacity Ex 7 000 Btu h gt 07 18 000 Btu h gt 18 Type of indoor units S Wall mounted A ART COOL C ART COOL Mirror B Ceiling concealed duct T Ceiling cassette V Ceiling amp Floor Model type M Multi type air conditioner Model Ttype C Cooling only H Heat pump Type of refrigerant A R410A Cooling heating capacity Ex 18 000 Btu h gt 18 48 000 Btu h gt 48 Model type FM Free joint type MPS inverter multi MULTI E MULTI F Dx Serial number Number of connecta
8. control Initializin Heating and cooling Heating Cooling Copyright 2008 LG Electronics Inc All right reserved 48 Only for training and service purposes LGE Internal Use Only Part 3 Control logic 8 2 Starting control 1 Only 1 LEV will be operate as below and others are closed fully 2 Starting control does not use the time when the system operate with partial load after example after finishing starting control for 1 indoor unit another indoor unit is ON additionally is operated with target opening of LEV 3 The indoor units which are in the middle of starting control are continuing starting control with the opening of its opening 4 Urgent control by indoor piping temperature 1 LEV open 4 pulse with every 10 sec when the indoor piping temperature is below 2 C 2 When the temperature reaches 4 C system return to the starting control pulse value Pull open Starting LEV opening Target Pulse Target step 3 bi Comp starting ime Option Time sec Copyright 2008 LG Electronics Inc All right reserved 49 Only for training and service purposes LGE Internal Use Only Part 3 Control logic 9 Oil restora 1 When the accumulated compressor running time is over 3 hr option oil restoring operation is made for 3 minutes If i s on the way of compressor starting it s made after the starting 2 Accumulated running time is cleared after the defrosting and oil
9. nnn 5 Fi 3 4 wee e E a i lt Input Power Source Check Point gt Copyright 2007 LG Electronics Inc All right reserved 116 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting gt 48 56k a lt Input Power Source Check Point gt lt Inverter PCB wiring Check Point gt Copyright 2007 LG Electronics Inc All right reserved 117 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting gt A7UW428FA3 A8UW488FA3 A9UW548FA3 pasad Cause of error Check point Normal condition e Power input AC 220V Outdoor Indoor Title e The connector for transmission is disconnected Communication e Communication poorly The connecting wires are misconnected Indoor gt Outdoor e The communication line is shorted at GND e Transmission circuit of outdoor PCB is abnormal e Transmission circuit of indoor PCB is abnormal Check Point 1 Check the input power AC230V Outdoor Indoor unit 2 Check the communication wires are correctly connected Adjust the connection of wire Confirm the wire of Live Neutral 3 Check the resistance between communication line and GND Normal Over 2MQ 4 Check the connector for communication is correctly con nected 5 If one indoor unit is operated normally outdoor PCB is no problem Check the another indoor unit CHO5 is displayed at indoor unit CH53 is displayed at
10. of ICO1M If there are no problems after above checks e Confirm the assembly condition that are catching and interfering parts in the link of the vertical louver Copyright 2007 LG Electronics Inc All right reserved 71 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting 6 6 Troubleshooting Indoor Error id Cause of error Check point 8 Normal condition e Open Short i Internal circuit error Normal voltage 2 5Vdc at 25 C plugged e Open Short Indoor inlet pipe sensor Soldered poorly e Internal circuit error Normal resistor 5KQ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Open Short Normal resistor 5KQ at 25 C Unplugged Indoor outlet pipe sensor Soldered poorly Normal voltage 2 5Vdc at 25 C plugged e Internal circuit error 10kQ 2 5Vdc Q V LD 0 Check the resistance Check the voltage Check Point Unplug the sensor on Indoor unit PCB Estimate the resistance of each sensor If the resistance of the sensor is 10KQ 5KQ at 25 C then sensor is normal If the resistance of the sensor is 0 KQ or o then sensor is abnormal gt Change the sensor Plug the sensor on Indoor unit PCB and Power ON Estimate the voltage of each sensor If the voltage of the sensor is 2 5Vdc at 25 C then sensor is normal CON OO FW N lt If the resistance of the sensor is O or 5Vdc then se
11. outdoor unit 6 If all indoor unit is displayed CHO5 but outdoor PCB not display 1 In Case of CHO5 Check the Connection gt CN POWER CN COMM at the Main PCB gt CN MAIN at the Noise Filter 2 In Case of CH53 Check the Connection gt CN COMM at the Main PCB gt CN MAIN COMM CN AC 220V at the Inverter PCB gt CN INVERTER at the Noise Filter WAIN COMM oun lt INVERTER PCB gt Copyright 2007 LG Electronics Inc All right reserved 118 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting Display code Cause of error Check point amp Normal condition e An instant over current in the U V W phase Comp lock The abnormal connection of U V W e Over load condition Overcharging of refrigerant Pipe length Outdoor Fan is stop e Poor insulation of compressor e Instant over current DC PEAK IPM Fault e Over Rated current e Poor insulation of IPM E Error Diagnosis and Countermeasure Flow Chart Check Pipe clogging distortion Check Covering Indoor Outdoor Unit Check EEV connector assemble condition normal operation Check refrigerant pressure Reassemble or manage if abnormality found Is installation condition normal Check resistance between each terminal of compressor 1 083 1 1230 5 Check insulation resistance between compressor terminal and pipe over 50M Replace compressor if abnormality found Are the
12. AN I Check the resistance Check Point 1 Check the wire connection Open Soldered poorly gt Repair the connection or change the PCB 2 Check the resistance of float switch Abnormal Open Normal short gt Check the float switch 3 Check the level of water 4 Check the volt Of Drain pump power supply AC 230V gt Repair or Change the main PCB Copyright 2007 LG Electronics Inc All right reserved 74 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting 6 7 Troubleshooting Outdoor Error gt A2UW146FA3 A2UW166FA0 A2UW166FA1 A3UW186FA0 A3UW216FA3 A4UW246FA3 pad i Cause of error Check point amp Normal condition e Power input AC 220V Outdoor Indoor e The connector for transmission is disconnected e The connecting wires are misconnected e Communication poorly e The GND1 2 is not connected at main GND e The communication line is shorted at GND e Transmission circuit of outdoor PCB is abnormal e Transmission circuit of indoor PCB is abnormal Communication Indoor gt Outdoor Check Point 1 Check the input power AC230V Outdoor Indoor unit 2 Check the communication wires are correctly connected gt Adjust the connection of wire gt Confirm the wire of Live Neutral 3 Check the resistance between communication line and GND Normal Over 2MQ 4 Check the connector for communication is correctly connected 5 Che
13. Check to see if the power cable plug is not dirty or loose If the plug is dust or loose it can cause an electrical shock or fire Do not use a joined power cable or extension cable or share the same power outlet with other electrical appliances otherwise it can cause an electrical shock excessive heat generation or fire Do not insert hands or other objects through the air inlet or outlet while the prod uct is operating There are sharp and moving parts that could cause personal injury Do not block the inlet or outlet of air flow It may cause product failure A CAUTION Check to see if the parts are mounted correctly and wires are connected Improper installation and connections can cause an electric shock or an injury Check the installation platform or frame has corroded Corroded installation plat form or frame can cause the unit to fall resulting in injury Be sure to check the earth wire is correctly connected After the work has finished be sure to do an insulation tset to check the resis tance is 2 Mohm or more between the charge section and the non charge metal section Earth position If the resistance value is low a disaster such as a leak or electric shock is caused at user s side Check the drainage of the indoor unit after the repair If drainage is faulty the water to enter the room and wet floor Copyright 2007 LG Electronics Inc All right reserved 5 Only for training an
14. High Super high Chaos wind e When Auto step selected and then operated the high medium or low speed of the airflow mode is operated for 2 15 sec randomly by the Chaos Simulation 2 6 Jet Cool Mode Operation e While in heating mode or Fuzzy operation the Jet Cool key cannot be input When it is input while in the other mode operation cooling dehumidification ventilation the Jet Cool mode is operat ed e In the Jet Cool mode the indoor fan is operated at super high speed for 30 min at cooling mode operation e In the Jet Cool mode operation the room temperature is controlled to the setting temperature 18 C e When the sleep timer mode is input while in the Jet Cool mode operation the Jet Cool mode has the priority e When the Jet Cool key is input the upper lower vanes are reset to those of the initial cooling mode and then operated in order that the air outflow could reach further 2 7 Swirl wind Swing e lt is the function for comfort cooling heating operation e The diagonal two louvers are opened the more larger than the other louvers After one minute it is opposite Vane 1 e Comparison of Air Flow Types 4 Open conventional Vane 1 Open Vane 1 Vane 2 Open Vane 2 Vane 3 Open Vane 3 Vane 4 Open Vane 4 Time Copyright 2007 LG Electronics Inc All right reserved 17 Only for training and service purposes Vane 2 Vane 3 Vane 4 Swirl Swing Ne
15. Is ODU Fan Motor Assemble condition normal 1 Set the multi tester to diode mode 2 Check voltage between 1pin and 4pin of Fan Motor 1 0 2V 3 Replace Inverter PCB if abnormality found N Is ODU Fan Motor normal 2 Yes Check wiring between OUD fan motor and Inverter PCB No Check if Hall Senor and Motor output terminal color is matched gt Reassemble if abnormality found Is wire connection of ODU Fan Motor wire normal Yes Replace Inverter PCB assembly Is Inverter PCB assembly normal Recheck power and installation condition Check Point 1 Check voltage between 1pin and 4pin of Fan Mortor connector Tester diode mode 2 Voltage vaule should be in 1V 0 2V Copyright 2007 LG Electronics Inc All right reserved 113 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting gt 27 30 40k Check voltage betwen 1pin and 4pin of fan motor Fan motor connector Tester gt 48 56k lt Inverter PCB gt Copyright 2007 LG Electronics Inc All right reserved 114 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting Display Cause of error Check point Normal condition code 1 Overload operation Pipe clogging Covering EEV defect Ref overcharge 2 Compressor damage Insulation damage Motor damage 3 Input voltage abnormal L N 4 Power line assemble condition abnorma
16. Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 6 8 Sleep Timer Operation e When the sleep time is reached after lt 1 2 3 4 5 6 7 0 cancel hr gt is input by the remote control while in appliance operation the operation of the appliance stops e While the appliance is on pause the sleep timer mode cannot be input e While in cooling mode operation 30 min later since the start of the sleep timer the setting temperature increases by 1 C After another 30 min elapse it increases by 1 C again e When the sleep timer mode is input while in cooling cycle mode the airflow speed of the indoor fan is set to the low e When the sleep timer mode is input while in heating cycle mode the airflow speed of the indoor fan is set to the medi um 6 9 Timer On Off 6 9 1 On Timer Operation e When the set time is reached after the time is input by the remote control the appliance starts to operate e The timer LED is on when the on timer is input It is off when the time set by the timer is reached e f the appliance is operating at the time set by the timer the operation continues While in Fuzzy operation the airflow speed of the indoor fan is automatically selected according to the temperature 6 9 2 Off Timer Operation e When the set time is reached after the time is input by the remote control the appliance stops operating e The timer LED is on when the off timer is input It is off whe
17. Test Run Check to see whether there is any refrigerant leakage and check whether the power or transmission cable is connected properly Check liquid pipe and gas pipe valves are fully opened NOTE Be sure to tighten caps Confirm that 500 V megger shows 2 0 MQ or more between power supply terminal block and ground Do not operate in the case of 2 0 MQ or less NOTE Never carry out mega ohm check over terminal control board Otherwise the control board may break Immediately after mounting the unit or after leaving it turned off for an extended length of time the resistance of the insulation between the power supply terminal board and the ground maydecrease to approx 2 0 MQ as a result of refrigerant accumulation in the internal compressor If the insulation resistance is less than 2 0 MQ turn on the main power supply Copyright 2007 LG Electronics Inc All right reserved 53 p LGE Internal Use Only Only for training and service purposes 4 Test Run Test operation for indoor unit ee s No Operate the unit in cooling mode Refer to part4 6 Electric part Does Test operation start Yes 1 2 a PO d a Y o o m Mi o Is cold air discharged for more than 3 minutes Yes Refer to part4 5 Cycle part Is there any temperature difference between intake and discharged air Yes Is the operating current No Check the load In Out Temp normal Check pipe length and amount
18. Th Error Open Short 4times O 4times O Cond Pipe Th Error Open Short 4times O Suction Pipe Error Open Short 4times O 6times OY Const D PipeTh Error Open Short 4times Q Capacity Over 5times O 1time 9 O Signal Error DSP Board lt gt Main Board 5times O 2times O Off Signal Error Indoor lt gt Outdoor 5times Q 3times Q Off Copyright 2007 LG Electronics Inc All right reserved 61 Only for training and service purposes 2 3 4 5 6 T 8 9 31 32 33 0 1 4 5 6 T 51 52 53 LGE Internal Use Only 5 Trouble Shooting mm LED 1 LED 2 E d Description Red Green Indoor Status 60 EEPROM Check Sum Error 6times O0 Off Cond Pipe Th High 6times Y Off 62 Heatsink Th High 6times 2times Q Off 63 Cond Pipe Th Low 6times Q Off 65 Heatsink Th Error Open Short 6times Y 5times O Off 67 Outdoor BLDC Fan Lock 6times Q Off PFC Fault Error S W 7times Y Off Copyright 2007 LG Electronics Inc All right reserved 62 Only for training and service purposes LGE Internal Use Only uN Gas side CLOSE da Y CLOSE E EJ Purge the air e Procedure 1 Confirm that both the 2 way and 3 way valves are set to the open position Remove the valve stem caps and confirm that the valve stems are in the raised position Be sure to use a hexagonal wrench to operate the valve stems 2 Operate the unit for 10 to 15 minutes 3 Stop operation and wait f
19. The room themperature is controlled by the thermistor of the wired remote controller control the temperature according to the position of wired remote controller e Position 3 The room temperature is controlled by lower temperature between the temperature of main body and of remote controller sensor 6 11 3 Move the slide switch to set position Room Temp sensor Slide switch for 2 Thermistor RISH R124 OP5R16H OP4 Ae O RISH Position 2 T72 Position 1 Position 317 6 11 4 Close the rear cover and check if it works normally A CAUTION e Select the position after counselling with a customer e In case of cooling mode room temperature is controlled by the main body sensor e To control the room temperature by a wired remote controller install controller room temp sensor to sense the temperature more accurately e Maunfactured in the position 1 Copyright 2007 LG Electronics Inc All right reserved 35 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 7 Special Functi 7 1 Zone Controller This feature can be used to control the operation of the Air Conditioning Unit where each zone maximum of 4 zones has a separate thermostat and damper motor your Air Conditioning Room1 Thermostat Room2 Thermostat Zone control sub PCB Room Thermostat Room4 Thermostat ce S0 0 NO VLO00CVOZLI9 6 Bor Iaa dies 3 i qe
20. _BRWON U V W CONNECTOR 1 Wait until inverter PCB DC voltage is discharged after main power off 2 Pull out CN L CN N connectors and U V W COMP Connector 3 Set multi tester to resistance mode 4 lf the value between P and N terminal of IPM is short 0Q or open hundreds MQ PCB needs to be replaced IPM damaged 5 Set the multi tester to diode mode 6 In case measured value is different from the table PCB needs to be replaced PCB damaged PFC_IPM chei UV W gt R Ah CAUTION In case that the control box is opend and before checking electrical parts it should be checked that the LED 01M 02M turned off wait 7 minutes after main power OFF otherwise it may cause electrical shock Copyright 2007 LG Electronics Inc All right reserved 88 Only for training and service purposes LGE Internal Use Only Display code Cause of error Input Over Current 27 30 40k 17A 1 48 56k 29A T 5 Trouble Shooting Check point amp Normal condition 1 Malfunction of Compressor 2 Blocking of Pipe 3 Low Voltage Input 4 Refrigerant Pipe length Blocked E Error Diagnosis and Countermeasure Flow Chart Is installation condition normal Are the resistance Between each phase and insulation resistance of Inverter compressor normal No Yes Is compressor Wire connection condition normal No Yes Is inverter PCB assembly No power conne
21. index of connectable kW 14 1 15 2 indoor units kBtu h 48 52 Power supply 10 220 240V 50Hz JS inverter inverter Chassis Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes FET FFIFFFFFFFF LGE Internal Use Only Part 1 General Information MULTI F ox 1 phase Heat Pump A7UW406FA3 A8UW486FA3 AQSUW566FA3 FM40AH UH3 FM48AH U33 FM56AH U33 No of connectable indoor units Max 7 Max 8 Max 9 Number of BD units to be connected Max 2 Total capacity index of connectable kW 15 2 18 2 21 4 indoor units kBtu h 52 62 73 Power supply 10 220 240V 50Hz Chassis MULT F px 3 phase JAA inverter TP AA inverter Heat Pump A6UW368FA0 FM37AH UEO A7UW428FA3 FM41AH U33 A8UW488FA3 FM49AH U33 No of connectable indoor units Max 6 Max 7 Max 8 Number of BD units to be connected Max 2 Total capacity index of connectable kW 13 5 15 8 18 2 indoor units kBtu h 46 54 62 Power supply 30 380 415V 50Hz inverter inverter Chassis Heat Pump A9UW548FA3 FM57AH U33 No of connectable indoor units Max 9 Number of BD units to be connected Max 3 Total capacity index of connectable kW 21 4 indoor units kBtu h 73 Power supply 38 380 415V 50Hz A inverter Chassis Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 1
22. min compressor off repeat Compressor ON Temp gt Setting Temp 0 5 C Compressor OFF Temp gt Setting Temp 0 5 C e In 10 min dehumidification operation the indoor fan operates with the low airflow speed Copyright 2007 LG Electronics Inc All right reserved 23 Only for training and service purposes LGE Internal Use Only Part 2 Functions Controls 6 1 Auto changeover operation e The air conditioner changes the operation mode automatically to keep indoor temperature e When room temperature vary over 2 C with respect to setting temperature air conditioner keeps the room tempera ture in 2 C with respect to setting temperature by auto change mode 44 C Switching point 2 C Heating thermo off 0 5 C SET Temp 0 5 C Cooling thermo off 2 C Switching point Cooling Heating operation Cooling operation operation Copyright 2007 LG Electronics Inc All right reserved 24 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls E Cooling amp heating Opeattions 6 1 1 Cooling Mode Thermo ON Setting Temp INV Comp Frequency High gt Low Comp OFF High lt Low Constant Comp Comp ON Comp OFF Comp ON e Operating frequency of compressor depends on the load condition like the difference between the room temp and the set temp frequency restrictions e f the compressor operates at some frequency the operat
23. multi tester to diode mode 6 In case measured value is different from the table PCB needs to be replaced PCB damaged V W Nu Nv Nw PFC_IPM check U V W gt R S T Ah caution In case that the control box is opend and before checking electrical parts it should be checked that the LED 01M 02M turned off wait 7 minutes after main power OFF otherwise it may cause electrical shock Copyright 2007 LG Electronics Inc All right reserved 120 Only for training and service purposes LGE Internal Use Only Display code Cause of error Input Over Current 5 Trouble Shooting Check point amp Normal condition 1 Malfunction of Compressor 2 Blocking of Pipe 3 Low Voltage Input 4 Refrigerant Pipe length Blocked E Error Diagnosis and Countermeasure Flow Chart Is installation condition normal Are the resistance Between each phase and insulation resistance of Inverter compressor normal No Yes Is compressor Wire connection condition normal No Yes Is inverter PCB assembly No power connection normal Yes No Is input voltage normal Yes Is inverter PCB assembly No normal Yes Recheck power and installation condition Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 1 Check Pipe clogging distortion 2 Check Covering Indoor Outdoor Unit 3 Check EEV connector as
24. not operate Turn off main power Check the connection of CN FAN Check the Fan Motor Check the Fuse AC250V T2A Check the related circuit of indoor Fan Motor e The pin No 68 of micom and the part for driving SSR Q01M e Check the related pattern e Check the SSR SSR Open Indoor Fan Motor never operate SSR short Indoor Fan Motor always operates in case of ON or OFF Turn on the main power Check the SSR high speed operation by remote control the Indoor Fan Motor is connected The voltage of Pin No 1 orange and 3 black of CN FAN About AC 160V over About AC 50V over SSR is not damaged Check SSR Copyright 2007 LG Electronics Inc All right reserved 70 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting 6 5 When the louver does not operate e Confirm that the vertical louver is normally geared with the shaft of Stepping Motor e If the regular torque is detected when rotating the vertical louver with hands Normal e Check the connecting condition of CN U D or CNOL R Connector e Check the soldering condition on PCB of CN U D or CNOL R Connector Check the operating circuit of the vertical louver e Confirm that there is DC 12V between pin O of CN U D CNOL R and GND e Confirm that there is a soldering short at following terminals Between O and of MICOM Between O 9 and 0 of MICOM Between and of ICO1M Between and 8
25. of Yes refrigerant Check for abnormal sound in outdoor unit comp Fan others Operation mode change to Heating mode Is hot air discharged No Refer to Troubleshooting After Hot Start Guide Yes Normal e Each indoor unit should be tested e f the unit has accessory it should be tested Copyright 2007 LG Electronics Inc All right reserved 54 Only for training and service purposes LGE Internal Use Only Zs 7 4 Test Run 3 1 SPLIT ART cool ART cool deluxe Type e Check that all tubing and wiring have been properly con nected e Check that the gas and liquid side service valves are fully open 3 1 1 Prepare remote controller Remove the battery cover by pulling it according to the arrow direction O Insert new batteries making sure that the and of battery are installed correctly Reattach the cover by pushing it back into position NOTE e Use 2 AAA 1 5volt batteries Do not use rechargeable batteries e Remove the batteries from the remote controller if the sys tem is not going to be used for a long time 3 1 2 Precautions in test run E The initial power supply must provide at least 90 of the rated voltage Otherwise the air conditioner should not be operated E For test run carry out the cooling operation firstly even during heating season If heating operation is carried out firstly it leads to the trouble of compres sor Then attention must be paid E Carry o
26. one level higher than the standard level Copyright 2007 LG Electronics Inc All right reserved 22 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 5 1 Hot start e When heating is started the indoor fan is stopped or very slow to prevent the cold air carry out e When the temp of heat exchanger reach 30 C model by model indoor fan is started 5 2 Self diagnosis Function e The air conditioner installed can self diagnosed its error status and then transmits the result to the central control Therefore a rapid countermeasure against failure of the air conditioner allows easy management and increases the usage life of air conditioner e Refer to trouble shooting guide 5 3 Soft dry operation e When the dehumidification operation input by the remote control is received the intake air temperature is detected and the setting temp is automatically set according to the intake air temperature Intake air Temp Setting Temp 26 C lt intake air temp 25 C 24 C lt intake air temp lt 26 C intake air temp 1 C 22 C lt intake air temp lt 24 C intake air temp 0 5 C 18 C lt intake air temp lt 22 C intake air temp intake air temp lt 18 C e While compressor off the indoor fan repeats low airflow speed and stop e While the intake air temp is between compressor on temp and compressor off temp 10 min dehumidification opera tion and 4
27. resistance Between each phase and insulation resistance of Inverter compressor normal Check inverter PCB assembly U V W connector connection condition Check wire disconnection and wiring Check compressor terminal connection condition bad contact Reassemble if abnormality found Is compressor Wire connection condition normal Check inverter PCB assembly IPM normality Replace inverter PCB assembly Is inverter PCB assembly normal Yes Recheck power and installation condition E Comp checking method Comp Resistance Q Resistance Q at20 C Resistance Q at20 C a e Q Terminal comp no M 1 088 o 1123 1 096 Copper pipe Resistance Q Resistance Q at 20 C Resistance Q at 20 C pedo F D U GND 50MO V GND 50MO W GND 50MO Copyright 2007 LG Electronics Inc All right reserved 119 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting CN L3 T a errepre PFC IPM a CN L1 R p E E E MALA A INV_IPM CN Comp U V W pe oo T 5 lt INVPCB gt lt PFC amp INV LED gt 1 Wait until inverter PCB DC voltage is discharged after main power off 2 Pull out CN L1 R CN L2 S CN L3 T and CN COMP Connector 3 Set multi tester to resistance mode 4 If the value between P and N terminal of IPM is short 0Q or open hundreds MQ PCB needs to be replaced IPM damaged 5 Set the
28. restoring operation Operating process 1 Fully open all the indoor s LEV 2 After the LEV opening change the compressor step to 70 Hz option 3 Reversing valve will be same as in defrosting process 4 Outdoor fan operates in low speed 5 During this operation if operating frequency should be changed by safety control then follow safety control first If compressor should be OFF by that stop operation 6 The LEV openings after this operation is 120 of the opening at the point of starting A function protecting inverter compressor from damages by increasing oil viscosity in low outdoor temperature For the control compressor operates in low frequencies Operating condition in case of the following 3 conditions are fulfilled at the same time Outdoor temperature D pipe temperature Heat sink temperature below 0 C 5 C lt OD temp lt 0 C pre i Starting 7 starting LEV Opening target 0 7 0 BEC 90 sec Time option Copyright 2008 LG Electronics Inc All Only for training and service purposes 10 C lt OD temp lt 5 C OD temp lt 10 C r starting r starting ra starting f starting Y 4 UY Opening target 0 7 Opening target 0 7 300 SEC O Sec 180 sec O sec Time option Time option 50 right reserved LGE Internal Use Only Part 3 Control logic 11 1 Functio
29. 34 im L Bey HE see ee oe YT lt MAIN PCB gt Pris Ta apaapa lt Inverter PCB gt lt EEPROM Direction Check Point gt Copyright 2007 LG Electronics Inc All right reserved 108 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting pane Cause of error Check point amp Normal condition 2 ODU fan locking 3 Heatsink assembly of INV PCB assemble condi tion abnormal 4 Defect of temperature sensing circuit part defect of INV PCB Inverter PCB heatsink Heatsink High V eatsink High error temperature is over 85 C E Error Diagnosis and Countermeasure Flow Chart 1 Check fan locking 2 Check covering of heat exchanger Is installation 3 Check distance between ODU and obstacles condition normal 4 Check pipe distortion and abnormality 5 Check service valve is opened gt Eliminate causes for abnormal condition Is assemble condition Check assemble condition between INV PCB heatsink and of INV PCB heatsink normal PFC 8 IPM module gt Reassemble if abnormality found Check resistance between NO 19 pin and NO 20 pin of PFC module Is PCB temperature Check resistance between NO 24 pin and NO 25 pin sensing part normal of PEC module gt 7KQ 10 at 25 C gt Replace PCB if abnormality found Check Point 1 Check resistance between No 19 pin and NO 20 pin of PCB PFC module 2 Check resistance between No 24 pin and NO 25 pin of
30. CB E Error Diagnosis and Countermeasure Flow Chart CH67 Outdoor fan lock occurrence Is fan connector condition right Yes No Is Fan motor nomal Change abnomal motor Replace inverter PCB assembly N NW Do right fan connector condition l J MTF gt e Rete dd a PA 6 ert t D e eD t ps El e e N a eh ts lt fan motor middle connection gt lt FAN Motor Connection check gt Copyright 2007 LG Electronics Inc All right reserved 134 Only for training and service purposes LGE Internal Use Only P NO MFL36552501 JUNE 2008
31. EATING OUTDOOR FAN1 TEMP Step_Fan 2 Step_Fan 1 Step_Fan 1 Step_Fan Step_Fan Step_Fan 1 Step_Fan 1 Step_Fan 2 Step_Fan 3 OUTDOOR FAN2 Step_Fan 2 Step_Fan 1 Step_Fan 1 Step_Fan Step_Fan Step_Fan 1 Step_Fan 1 Step_Fan 2 2 DC motor fan control COOLING HEATING OUTDOOR FAN TEMP 3 45 C 41 C 38 C 28 C 24 C 18 C 14 C 9 C 2 C 3 C Copyright 2007 LG Electronics Inc All right reserved 46 Only for training and service purposes LGE Internal Use Only Bartraublertiad digig 7 Defrost Con trol 7 1 Function These are about the control of compressor fan of outdoor unit reversing valve LEV 7 2 Starting to the defrosting operation A Defrost operation will be start when all the conditions below are matched simultaneously Accumulation time of operation and the period after completion of defrost 35min Outdoor air temperature 3 C B Outdoor piping temperature is below than 6 Option C for starting defrosting operation 7 3 Completion of defrost operation Send signal of defrost completion in case of meeting one of the condition as below 1 Defrosting time 7 minutes 2 Piping temperature maintain 10 seconds Option in condition of more than 15 C Option 7 4 Defrosting Control Algorithm Satisfy Satisfy man Defrost Defrost eating Start ld End Start Condition a Condition Defrost flag cle
32. G Electronics Inc All right reserved 41 Only for training and service purposes LGE Internal Use Only Part 3 Control logic 2 1 Frequency control Frequency that corresponds to each rooms capacity will be determined according to the difference in the temperature of each room and the temperature set by the remote controller There are various factors determining the frequency 1 Indoor unit capacity value 2 Temperature compensation factor 3 Initial frequency setting To amp fro feedback a EAEE eg ee Indoor temperature Indoor capacity Basic formula of Indoor On OFF Outdoor calculation Selected fan speed Temperature Compressor setting Continues check System Indoor Outdoor Calculation of ON Setting data data set frequency system Stop system 2 2 Primary step setting Capacity steps of compressor are decided by gt Qj Summation of capacity code TAO Outdoor temp TAl Indoor temp DTAI Step Compensation of temperature difference Indoor Temp and Setting Temp Comp Step Step base Long piping compensation x AStep TAO x AStep TAI x AStep DTAI Step base Standard frequency step by gt Qj Summation of capacity code Long piping Comp Step compensation by setting long piping AStep TAO step compensation by TAO Outdoor temp AStep TAI step compensation by TAI Indoor temp AStep DTAI Step Compensation
33. General Information 2 3 BD Branch distributor units No of connectable indoor units Max 2 Max 3 Max 4 Model name PMBD3620 PMBD7220 PMBD3630 PMBD7230 PMBD3640 Connectable indoor unit capacity kW 2 05 7 03 5 28 10 6 2 05 7 03 5 28 10 6 2 05 7 03 kBtu h 7 24 18 36 7 24 18 36 7 24 BD unit Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 10 LGE Internal Use Only Part 1 General Information 3 1 Indoor Unit Global AMN A Serial number Function A Basic L Nano plasma Wall Mounted C Plasma ceiling cassette G Low static motor ART COOL Mirror type front panel color B Blue C Cherry D Wood M Metal R Mirror V Silver W White wood E Red G Gold H White Silver 1 KISS Chassis name Indoor unit type L Wall Mounted A ART COOL D ART COOL Mirror T Ceiling cassette B Ceiling concealed duct V Ceiling amp floor Electrical rating 6 19 220 240V 50Hz G 19 220 240V 50Hz 60Hz Cooling heating capacity Ex 7 000 Btu h gt 07 18 000 Btu h gt 18 Model type H Heat pump Indicates that this is multi system indoor unit using R410A 3 2 Outdoor Unit Global Serial number Function A Basic Multi type F Free joint multi type Electrical rating 6 19 220 240V 50Hz 8 39 380 415V 50Hz Cooling heating capacity Ex 24 000 Btu h gt 24 48 000 Btu h gt 48
34. PCB PFC module only 48 56k 3 Resistance value should be in 7kQ 10 at 25 C Copyright 2007 LG Electronics Inc All right reserved 109 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting gt 27 30 40k PFCM Measuring resistance between No 19 20 pin gt 48 56k YN end sm wae PFCM IPM Measuring resistance Measuring resistance between No 19 20 pin between No 24 25 pin Copyright 2007 LG Electronics Inc All right reserved 110 LGE Internal Use Only Only for training and service purposes 5 Trouble Shooting Display Cause of error Check point amp Normal condition code 1 ODU fan locking 2 Heatsink assembly of INV PCB assemble Inverter PCB heatsink ni Heatsink High error condition abnormal sensor is open or short e a 3 Defect of temperature sensing circuit part defect of INV PCB Error Diagnosis and Countermeasure Flow Chart 1 Check fan locking 2 Check covering of heat exchanger Is installation 3 Check distance between ODU and obstacles condition normal 4 Check pipe distortion and abnormality 5 Check service valve is opened gt Eliminate causes for abnormal condition Is assemble condition Check assemble condition between INV PCB heatsink and of INV PCB heatsink normal PFC amp IPM module gt Reassemble if abnormality found Check resistance between NO 19 pin and NO 20 pin of PFC module Is PCB tempe
35. a 45 0 QUIAOO Fan CONTO lr taa 46 La DETFOSE CON Mo in dd 47 EV COMO aia rectal i oc 48 9011 restoration opera Nasca 50 10 Compressor warm up control lOQIC ccccncncccnnncccccnncccccnnnncccnnncconononancnnnnnn non nnnnnnnnnnnnnas 50 11 Heat Sink CONTON ind ins 51 Copyright 2008 LG Electronics Inc All right reserved 39 Only for training and service purposes LGE Internal Use Only Part 3 Control logic 1 1 Basic principle Basic principle is to control the rpm of the motor by changing the working frequency of the compressor Three phase voltage is supplied to the motor and the time for which the voltage will supplied is controlled by IPM intelligent power module Switching speed of IPM defines the variable frequency input to the motor RPM gt Revolutions Minute RPM 120f D F gt Frequency P gt Number of poles BLDC Motor IPM Inverter Positie MCU els i CAL Bits Copyright 2008 LG Electronics Inc All right reserved 40 Only for training and service purposes LGE Internal Use Only Part 3 Control logic 1 2 Inverter compressor starting Target Step calculation method e Step A Step 1 Frequency e Step B Step A Target STEP e Step C Step B Target STEP e Step D Step C Target STEP 2 2 2 e Step E Step D Target STEP 2 Target frequency Hz NO A ati anna Step E frequency A A A CID 3 Step C Step B Step A Time sec Copyright 2008 L
36. a id 54 3 NOSE FRU O sata dd ERAN AAA AA 55 Part5 Trouble Shooting Guid lt voii inia a EEE T 58 1 Self diagnosis FUNCION isnin i eiae 59 2 PUMP DOWD isos A aa 63 3 VAG UTI OI e a seta ds 64 A Gas Charging Aileen dis 65 5 Cycle Part asec cre sss O a at are a 66 Electronic PariS oneri aA AA 67 Copyright 2007 LG Electronics Inc All right reserved ef Only for training and service purposes LGE Internal Use Only i Part 1 General Information Ts Salty PFECAUTONS e A 3 2 MOE UN ia load un code o ree ree 6 NO UA O 11 Copyright 2007 LG Electronics Inc All right reserved es Only for training and service purposes LGE Internal Use Only Part 1 General Information To prevent injury to the user or other people and property damage the following instructions must be followed E Incorrect operation due to ignoring instruction will cause harm or damage The seriousness is classified by the follow ing indications A WARNING This symbol indicates the possibility of death or serious injury ACAUTION This symbol indicates the possibility of injury or damage to properties only E Meanings of symbols used in this manual are as shown below Be sure to follow the instruction Dangerous Voltage 1 1 Cautions in Repair WARNING Be sure to disconnect the power cable plug from the plug socket before disas sembling the equipment for a repair Internal components and circuit boards are at main po
37. alve Some Models are different with temperature of indoor fan ON OFF Copyright 2007 LG Electronics Inc All right reserved 2 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 6 2 Auto cleaning operation e Function used to perform Self Cleaning to prevent the Unit from Fungus and bad odor e Used after the Cooling Operation before turning the unit off clean the Evaporator and keep it dry for the next opera tion e The function is easy to operate as it is accessed through the Remote controller ON Heat Pump Unit LL Operation OFF Indoor Fan Setting step 13 14 minutes 1minute 2 3 minutes ON Cooling Only Unit MA Operation OFF Indoor Fan Setting step Copyright 2007 LG Electronics Inc All right reserved 28 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 6 3 Auto Operation Fuzzy Operation e When any of operation mode is not selected like the moment of the power on or when 3 hrs has passed since the operation off the operation mode is selected e When determining the operation mode the compressor the outdoor fan and the 4 way valve are off and only the indoor fan is operated for 15 seconds Then an operation mode is selected according to the intake air temp at that moment as follows 24 C lt Inatake Air Temp 3 Fuzzy Operation for Cooling 21 C lt Inatake Air Temp lt 24 C gt Fuzzy Oper
38. an 3 seconds Then Wind Data is memorized by the EEPROM of the main PCB 4 AUTO SWING OPERATION SET TEMP FAN SPEED SUB FUNCTION 3k as 1171 SHI Timer H te E E Time A o Copyright 2007 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes E S P setting value reference Part 2 Functions amp Controls Static pressure mmAq 0 1 2 Model name Step Hi Med Lo Setting value 8 CMM 220 215 210 AMNHO96BT GO 7 CMM 240 235 230 MBO9AHL NTO 6 CMM 255 250 245 10 CMM 210 85 150 AMNH126BTGO IMB12AHL NTO 9 CMM 215 190 170 8 CMM 220 200 175 14 CMM 170 150 130 IMB18AHL NTO 13 CMM 185 165 145 12 CMM 200 180 160 Static pressure mmAq 0 1 2 3 4 Model name Step Hi Med Lo Setting value 8 5 CMM 75 84 94 104 114 MBO9AHL N10 1 9 5 CMM 82 90 99 109 118 AMNH12GB1A0 1 IMB12AHL N10 1 8 5 CMM 75 84 94 104 114 7 5 CMM 69 77 88 99 110 15 CMM 90 97 105 114 122 AMNH18GB2A0 1 IMB18AHL N20 1 13 5 CMM 82 90 99 109 119 11 5 CMM 75 84 93 103 114 17 CMM 110 117 125 129 AMNH24GB2A0 1 IMB24AHL N20 1 15 CMM 100 107 115 121 127 13 5 CMM 90 97 105 114 122 Static pressure mmAq 0 2 4 Model name Step Hi Med Lo Setting value 10 5CMM 225 2 210 AMNHO96BPAO 245 240 230 254 253 250 11 5CMM 210 200 100 AMNH126BPA0 10CMM 235 230 220 8 5CMM 254 251 245 Notes 1 To get the desired Airflow 4 E S P combination from the table se
39. ar 10 Baseline 80 Hz Option Control Inverter Comp 350 Pulse Option Control l gt qual o Outdoor LEV STi itty eee Saree rrr E eee A 2 76 2 S H pa O s gt Bs eo eo e A S Y j Defrost signal of oo gt indoor unit on f Meer deial signal or ON Stafting maximum defrosting ON time count i Reversing Valve Indoor Fan y E gt ON OFF Outdoor Fan Copyright 2007 LG Electronics Inc All right reserved 47 Only for training and service purposes LGE Internal Use Only Part 3 Control logic 8 1 Control of LEV opening 1 LEV openings have a controllable ranges 70 option to 460 option pulse in both condition of cooling and heating 2 Products do not be operated before initializing of LEV when starting 3 Time constant control period of LEV is every 2 minutes except below conditions Control LEV every 1 minutes for 10 minutes after starting When indoor capacity changed Control LEV every 1 minutes for 10 minutes after starting Control LEV every 1 minutes for 10 minutes after starting in case of the special situation such as defrost completion oil recovery oil equalizing control oil supplying current transformer limitation limitation of discharge temperature low ambient operation control LEV opening Pulse Power input Reset 460 E Starting Time constant control control Starting
40. ase of error Drain pump Float switch Float switch Open Communication Indoor lt gt Outdoor Communication Poorly Outlet pipe sensor Open Short Different operation mode Different operation mode Copyright 2007 LG Electronics Inc All right reserved 59 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting 1 3 Error Indicator Outdoor Outdoor Error Ex Error 21 DC Peack 2 Times 2 Times 2 Times LEDO1G i l l RED e gt see LEDO2G EE GREEN E i 2 Sec 2 Sec Error Contents DC Peak IPM Fault LED01G M Red 2times Y LEDO2G M c f Error Outdoor Green AaS SES Status Ttime Over Rated Current O2 CT 2 Max CT 2times Y 2times cp Input Over Current 3times DC Link Volt is below 140Vdc DC Link Low Volt L_P H_P Switch 2times Y 2times OY Atimes Low High Press Switch Open Low Voltage Over Voltage 2times Y 5times Y Abnormal AC Volt Input DC Compressor Position Error 2times Y 6times Y Compressor Starting Fall Error PSC PFC Fault Error 2times Y 7times Inverter PCB input current is over100A peak for 2us DC Link High Volt 2times Y 8times Y Off COMP Over Current 2times OY Otimes Y Over Inverter Compressor Current CT Error 3times Y ttime Low Current ses O O D Pipe High nord CT Sen
41. ation for Dehumidification Inatake Air Temp lt 21 C 3 Fuzzy Operation for Heating e f any of the operation modes among cooling dehumidification heating mode operations is carried out for 10 sec or longer before Fuzzy operation the mode before Fuzzy operation is operated 6 3 1 Fuzzy Operation for Cooling e According to the setting temperature selected by Fuzzy rule when the intake air temp is 0 5 C or more below the set ting temp the compressor is turned off When 0 5 C or more above the setting temp the compressor is turned on Compressor ON Temp gt Setting Temp 0 5 C Compressor OFF Temp gt Setting Temp 0 5 C e At the beginning of Fuzzy mode operation the setting temperature is automatically selected according to the intake air temp at that time 26 C lt Intake Air Temp gt 25 C 24 C lt Intake Air Temp lt 26 C gt Intake Air Temp 1 C 22 C lt Intake Air Temp lt 24 C gt Intake Air Temp 0 5 C 18 C lt Intake Air Temp lt 22 C gt Intake Air Temp Intake Air Temp lt 18 C gt 18 C e When the Fuzzy key Temperature Control key is input after the initial setting temperature is selected the Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature automatically accord ing to the Fuzzy rule e While in Fuzzy operation the airflow speed of the indoor fan is automatically selected according to the temperature 6 3 2 Fuzzy Operation for Dehumidificati
42. ation of Remote Controller use it by directing the trans mitter part of Remote Controller to the receiver part of front panel directly under front panel e Do not drop it down or into water Or else there is worry about trouble failure e Do not press hard the Remote Controller button with nail ball point pen or other sharp substance Or else there is worry about trouble failure e In case when obstacle such as curtain hides the signal reception part of receiver in between the space interval Remote Controller operation is infeasible Copyright 2007 LG Electronics Inc All right reserved 37 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls e How to Operate the Lift Grill A CAUTION e Always stop the air conditioner operation for safety before operating lift grill e Take heed _ there is worry about dust fall etc when suction grill descends e In case when the set automatic stop distance goes wrong check the set value of operation panel and con firm if there is neither obstacle nor mankind e When you are not to remove obstacle stop the operation before touching the obstacle Automatic Stop Distance of Grill 1 Stop the Air Conditioner Operation 2 Descend the Suction Grill Depress the down button yy Then suction grill descends and stops automatically at a certain distance You may stop it at wanted distance point by depressing the stop but ton
43. ble indoor units Max capacity of connectable indoor units Ex 36 000 Btu h gt 36 72 000 Btu h gt 72 BD Branch distributor M Multi system outdoor unit P Parts 12 LGE Internal Use Only E Part 2 Functions amp Controls 1Listof Functions amp GONTROLS cocina ir 14 De AI OW AA a O E tae N A 16 201 AUTO SWING ets TIGHT aa cas 16 2 2 AUTOS WIN UDE GOWN arre 16 23 ONaOS WIN UDI WM iaa 16 O A e e CEE A 17 25 0na0sWINA auto WIN cds 17 2 0 JEL COO Mode Operators 17 AS A 17 3 A DUI O a ind 18 311 PLASMA AIr PURDYING VS Min 18 4 installation FUNCUONS o iia ti 19 4 1 ESP External Static Pressure Setting ooooonnccccconncccccconooononncnnnnnnnnnnononononannnns 19 42 FAG CMMI OST AO srta 22 Sys FACT MAU AAA PA e weenea te eee toto decent ae eee ene 23 PROFS A E EEE E O ee eee 23 52 Selsalagnosis FUNCION pieces Seer oh setts a E N radete 23 DS OOM A A 23 6 Convenience Functions 8 Controls ooooooccconcconccccccononononcccnnnnonononononononanonos 24 6 1 Auto Changeover Operation ccccccsessscceecccseeesseeeeeesseeesseeeceesesseaseeeeeeessseaseeeeeesseneas 24 6 2 AUTO cleaning OM SNATION areis den dnatnda aunt iveaveusunsnatettasisendseasuadendeddceattatin 28 6 3 Auto Operation Fuzzy Operation oooonnccccccnncccccccccoonncncnonononnnnnnnonnnnnnnnnnnnnnonononononos 29 6 4 Auto restant OD CAMOMN tomes errar A 30 5 OPIJ Lock FUNCION pts ida 31 6 6 FOrCO0 ODO MOM
44. ck the connection of GND1 GND2 and main GND 6 If one indoor unit is operated normally outdoor PCB is no problem Be Vif WPM Wh TO INDOOR UNIT CHO5 is displayed at indoor unit CH53 is displayed at out door unit Copyright 2007 LG Electronics Inc All right reserved 75 gt Check the another indoor unit Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting pened Cause of error Check point amp Normal condition e An instant over current in the U V W phase Comp lock e Instant over current The abnormal connection of U V W DC Peak e Over Rated current Over load condition e Poor insulation of IPM Overcharging of refrigerant Pipe length e Poor insulation of compressor Resistance Q at 20 C Inverter Constant Terminal comp comp oes o8 oes 08 oes os Resistance Q at 20 C Inverter Constant Terminal comp comp U GND V GND 2MQ W GND 2MQ Check Point 1 Check the wire connection U V W 2 Check the load condition Refrigerant Pipe length gt Adjust the load condition 3 Check the electricity leakage of the compressor gt Normal Over 2MQ 4 Check the resistance of compressor gt Normal 0 65Q INV 0 8Q Cons gt No difference at each terminal 5 Check the insulation from water at IPM part gt Check the trace of water 6 Check the IPM circuit Copyright 2007 LG Electronics Inc All right reserved 6
45. connecting mistake and over current Operating process 1 Detection check the output DC voltage of Current Transformer CT 5 2 Operating process CT 1 detection 1 If total current exceeds CT1 1 value reduce inverter operation by 1 step Step down 5Hz Option from current step If new Hz is below minimum Hz of operation cooling amp heating then turn off the compressor 2 After step down still if the total current exceed CT1 for more than 5 sec then step down inverter operation by 1 more step 3 If the current continue below CT1 for more than 1 min return the to setting step Hz CT 2 detection 1 If total current exceeds CT2 turn off compressor And after 3 min turn on the compressor and check the current again 2 If CT2 occurs 5 times in 1 hour stop the operation and shows Self Diagnosis Error Mode 22 Current CT 5 Hz Option Down 5Hz Option OFF Down Frequency Setting 3 Frequency 7 fixed frequency fixed Frequency Setting Frequency Hz frequency fixed Copyright 2008 LG Electronics Inc All right reserved 45 Only for training and service purposes LGE Internal Use Only Pait aude Shaldige 6 Outdoor Fan Control 6 1 Function Working of outdoor fan are different in different models Some models are single fan some are two fan type 6 2 Operating process Control logic of outdoor fan depends on outdoor temperature 1 AC motor fan control COOLING H
46. cs Inc All right reserved 94 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting Check Point 1 Check the connection of H press switch 2 Check short or not at the connector of high pressure switch Normal open gt 27 30 40k lt Main PCB Connection Check Point gt gt 48 56k lt Main PCB Connection Check Point gt lt Checking the H press switch gt Copyright 2007 LG Electronics Inc All right reserved 95 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting pened Cause of error Check point amp Normal condition e Abnormal Input voltage e Check the power source Input voltage 140Vac 300Vac e Check the components E Error Diagnosis and Countermeasure Flow Chart Is input voltage normal Check L N Voltage is 220V 15 Is Inverter PCB Normal Recheck power and installation condition Replace inverter PCB assembly Check Point 1 Check the Input Voltage L N gt 220V 10 2 Check Input Voltage Sensor output voltage 2 5Vdc 10 lt Input Power Source Check Point gt Copyright 2007 LG Electronics Inc All right reserved 96 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting gt 27 30 40k gt i1 ID fi 1 a pa dE 1 Mo Mm Le E tie A i L j 2 EAN i ere sl Ea f e pee q lafa S lt Invert
47. ction normal Yes No Is input voltage normal Yes No Is inverter PCB assembly normal Yes Recheck power and installation condition Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 1 Check Pipe clogging distortion 2 Check Covering Indoor Outdoor Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure gt Reassemble or manage if abnormality found 1 Check resistance between each terminal of compressor 0 188 7 2 Check insulation resistance between compressor terminal and pipe over 50M gt Replace compressor if abnormality found 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact gt Reassemble if abnormality found Check connection between inverter PCB assembly and bridge diode misconnection disconnection gt wiring again if abnormality found Check L N phase is 220V 15 gt Check connection condition and wiring if power is abnormal Check inverter PCB assembly IPM normality gt Replace inverter PCB assembly 89 LGE Internal Use Only 5 Trouble Shooting Check Point 1 Check the power source 220V 15 2 Check the fan operation is right 3 Check the current 4 Check the install condition 5 Check the CT Sensor Output signal 27 30 40
48. d service purposes LGE Internal Use Only Part 1 General Information 2 1 Indoor units Category Type Model names Capacity kW kBtu h 2 05 2 64 3 52 5 28 7 03 7 9 12 18 24 AMNHO7GDA4LO AMNHO9GD4LO AMNH12GD4L0 S4 MSO7AH N40 MSO9AH N40 MS12AH N40 Wall mounted AMNH18GD5L0 AMNH24GD5L0 S5 MS18AH N50 MS24AH N50 SP1 AMNHO96AP AMNH126AP MAO9AH NP1 MA12AH NP1 ART COOL AMNHO9GAF 1 AMNH12GAF 1 SF MAO9AH NF1 MA12AH NF1 sz AMNHO7GDZ 0 MCO7AH NZ1 SU AMNHO9GDU 0O AMNH12GDU 0 MCO9AH NU1 MC12AH NU1 ART COOL Mirror 83 AMNH18GD3 0 AMNH24GD3 0 MC18AH N31 MC24AH N31 AMNHO7GDE AMNHO9GDE AMNH12GDE SE MCO7AH NE1 MCO9AH NE1 MC12AH NE1 S8 AMNH18GD8 1 AMNH24GDg8 MC18AH N81 MC24AH N81 1 way Ti AMNHO9GTCCO AMNH12GTCCO MTO9AH NC1 MT11AH NC1 Ceiling TE AMNHO9GTEFO AMNH12GTEFO AMNH18GTEFO cassette MT10AH NE1 MT12AH NE1 MT18AH NE1 4 way TH AMNH24GTHFO MT24AH NHO indicates color of panel B Blue C Cherry D Wood M Metal R Mirror V Silver W White wood E Red G Gold H White Silver 1 KISS Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 1 General Information Category Chassis Type Model names Capacity kW kBtu h 2 05 5 28 7 03 7 18 24 High static AMNH186BHAO AMNH246BHAO pres
49. e ABZCA 7 2 Low Ambient control e This Function is for cooling operating in outdoor low temperature e f outdoor temperature drops below certain temperature liquid back is prevented by reducing outdoor fan speed e lt can prevent frosting of evaporator and keep cooling operation Outdoor pipe PDA Outdoor Copyright 2007 LG Electronics Inc All right reserved 36 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 7 3 Space control Vanes angle can be controlled by pair considering its installation environment E e For example direct drafts can be annoying leading to r 4 discomfort and reduced productivity vane control E y helps to eliminate this problem a e oe e Easily controlled by wired remote control e Air Flow can be controlled easily regarding any space environment 7 4 Auto Elevation Grille e Auto Elevation Grille is automatically down to height of max 3 1 m So it enables to install the Indoor unit a at high ceiling space And Auto Elevation Grille po makes you cleaning the filter easily E ELEVATION GRILL REMOTE CONTROLLER_Accessory e Main Components of Lift Grill Signal transmitter o Lift grill front panel assembly Bolts for installation 4 EA P No 3A00255k Instruction manual Ascend Remote Controller for lift grill Descend e How to Use Remote Controller Stop As for oper
50. ed 56 Only for training and service purposes LGE Internal Use Only 4 Test Run 3 3 Ceiling Cassette Type 3 3 1 PRECAUTIONS IN TEST RUN e The initial power supply must provide at least 90 of the rated voltage Otherwise the air conditioner should not be operated CAUTION MD For test run carry out the cooling operation first even during winter season If heating operation is carried out first it leads to the trouble of compressor 2 Carry out the test run more than 5 minutes without stopping Test run will be cancelled 18 minutes later automatically e The test run is started by pressing the room temperature checking button and down timer button for 3 seconds at the same time e To cancel the test run press any button 3 3 2 CHECK THE FOLLOWING ITEMS WHEN INSTALLATION IS COMPLETE e After completing work be sure to measure and record trial run properties and store measured data etc e Measuring data are room temperature outside temperature suction temperature blow out temperature air velocity air volume voltage current presence of abnormal vibration and noise operating pressure piping temperature e As to the structure and appearance check following items LI Is the circulation of air adequate L Does the romote controller works properly Ll Is the drainage OK 1 Is there any error on wiring 1 Is the heat insulation complete L Aren t terminal screws loosened refrigerant and drain piping 1 Is there a
51. election switch is on the main unit of the appliance and operate the appliance in the standard conditions e The operating condition is set according to the outdoor temp and intake air temperature as follows Setting speed of Indoor temp Operating Mode Setting temp lar f n over 24 C Cooling 22 C 21 24 C Healthy Dehumidification 22 C High speed below 21 C Heating 22 C e The unit select the last operation mode in 3 hours e Operating procedures when the remote control can t be used is as follows The operation will be started if the ON OFF button is pressed If you want to stop operation re press the button Copyright 2007 LG Electronics Inc All right reserved 31 Only for training and service purposes LGE Internal Use Only Part 2 Functions Controls 6 7 Group Control 6 7 1 Operation Summary e Where several products are linked one specific control device can control a specific number of products 6 7 2 Specific Operation e Connecting line is linked to each of the indoor equipments for communication A specific control device is connected to each of them and this control device can control the same function e Group control function is enabled by cutting an optional jump wire in the wired remote control At this time the main system will not respond in order to prevent data collision e While executing group control command use the random data 0 3minutes in the main body of indoo
52. er PCB gt gt 48 56k A y ME p lt Inverter PCB gt lt Input Voltage Sensing Check Point gt Copyright 2007 LG Electronics Inc All right reserved 97 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting panal Cause of error Check point amp Normal condition C e Check the connection of comp wire U V W maa el a ant e Malfunction of compressor Position Starting fail error e Check the component of IPM detection parts E Error Diagnosis and Countermeasure Flow Chart 1 Check Pipe clogging distortion 2 Check Covering Indoor Outdoor Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure gt Reassemble or manage if abnormality found Is installation condition normal 1 Check resistance between each terminal of compressor 0 188 7 2 Check insulation resistance between compressor terminal and pipe over 50MQ gt Replace compressor if abnormality found Are the resistance Between each phase and insulation resistance of Inverter compressor normal 1 Check inverter PCB assembly U V W connector connection condition Is compressor 2 Check wire disconnection and wiring Wire connection 3 Check compressor terminal connection condition condition normal bad contact gt Reassemble if abnormality found Check inverter PCB assembly IPM normality gt Replace inverter PCB assembly
53. erating 500V 7 5 Check DC Link Sensing Signal Refer the Picture ak a e m Mad ROST 1K 2012 ROIT RO2T RO1T 021 330K 1 17 lt INPUT VOLTAGE Check Point gt Copyright 2007 LG Electronics Inc All right reserved 124 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting Display code Cause of error Check point amp Normal condition Abnomal Input Voltage Input voltage R S T N 140Vac 300Vac Check the power source e Check the components Error Diagnosis and Countermeasure Flow Chart R S S T T R phase voltage is 400V 10 Is input voltage normal R N S N T N phase voltage is 220V 10 gt Check connection condition and wiring if power is abnormal Replace inverter PCB assembly Is Inverter PCB Normal Recheck power and installation condition C02C 0 001u 2012 70K 2012 RO2C Input Volt PFC 7 5K 2012 a RO3C RO6C 2010 1M 1 2W ROIC ROSC 20K 2012 lt input Voltage T COIC 0 01u y 5V SV RO7C 15K 1 2012 012 RO8C Tester i 15K 1 2012 IC01C LMV324 lt CH25 Check Point gt A lt INPUT VOLTAGE Check Point gt Copyright 2007 LG Electronics Inc All right reserved 125 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting pened Cause of error Check point amp Normal condition e Check the connection of comp wire U V W e Malfunction of compress
54. ervice purposes LGE Internal Use Only 5 Trouble Shooting posi Cause of error Check point amp Normal condition e Malfunction of current detection circuit Open Short C T e Initial current error e The voltage of CO1N Is 4 0Vdc 25A Sensor Error e Check CT Sensor output voltage 2 5Vdc 5 E Error Diagnosis and Countermeasure Flow Chart No If the CT Sensor output is not 2 5Vdc e5 Is CT Sensor Output is right Replace the Inverter PCB Yes No Check the input voltage source Is input voltage normal Is nomal the offset of R N T N voltage Yes Recheck the Inverter PCB and installation condition ICO1G ACS 54SCB 050 Input Current R PFC ROSG 2K 2012 O Input Current R INV gt O Tester IC026 ACS 54SCB 050 CT Sensor Output Input Current T PFC at the INVERTER PCB RO2G 2K 2012 lt INVERTER PCB gt lt INPUT VOLTAGE Check Point gt Copyright 2007 LG Electronics Inc All right reserved 129 ee menisan Only for training and service purposes y 5 Trouble Shooting ral Cause of error Check point amp Normal condition Air sensor Suction Pipe sensor D pipe sensor Inverter Condenser Pipe sensor e Open Short e Soldered poorly e Internal circuit error e Open Short e Soldered poorly e Internal circuit error e Open Short e Soldered poorly e Internal circuit error e Open Short e Soldered poorly e Internal circuit er
55. est operation Optional Optional Special function amp kit Optional Notes The Exploded View part has the particular Function table for each model Copyright 2007 LG Electronics Inc All right reserved 15 Only for training and service purposes LGE Internal Use Only Part 2 Functions Controls 2 1 Auto swing left 8 right e By the horizontal airflow direction control key input the left right louver automatically operates with the auto swing or it is fixed to the desired direction 110 120 2 2 Auto swing up amp down e By the auto swing key input the upper lower vane automatically operates with the auto swing or it is fixed to the desired direction 110 120 2 3 Chaos swing up down e By the Chaos swing key input the upper lower vane automatically operates with the chaos swing or it is fixed to the desired direction 110 120 NOTE Some Models are different by swing width and swing pattern Copyright 2007 LG Electronics Inc All right reserved 16 Only for training and service purposes LGE Internal Use Only 2 4 Air flow step e Indoor fan motor control have 6 steps e Air volume is controlled SH H Med Low by remote controller e LL step is selected automatically in Hot start operation 2 5 Chaos wind auto wind Part 2 Functions amp Controls Step Discription Very low In heating mode Low Med
56. ght reserved 122 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting Display code Cause of error Check point Normal condition e Check point 4 Normal condition e Check the TAB1 is connect e DC Link vol DC Link Low voltage IN e At not operating DC Link voltage 260V T 300V e At Comp operating DC Link voltage 500V 7 E Error Diagnosis and Countermeasure Flow Chart Is DC Link voltage Check the DC link Voltage AD Input of Inverter PCB under 380V If AD Input is strange change the Inverter PCB refer the next page R S S T T R phase voltage is 400V 10 No R N S N T N phase voltage is 220V 10 gt Check connection condition and wiring if power is abnormal Is input voltage normal Yes No Check connection from terminal block to Inverter PCB assembly CN_L1 R CN_L2 S CN_L3 T Is Inverter PCB assembly Power connection normal Yes Replace inverter PCB assembly Is Inverter PCB Normal Yes Recheck power and installation condition Copyright 2007 LG Electronics Inc All right reserved 123 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting Check Point 1 Check the Tab1 connection condition Refer to outdoor wiring diagram 2 Check the CN_L1 R CN_L2 S CN_L3 T connection condition 3 Check the DC Link voltage at not operating 380V 4 Check the DC Link voltage at Comp op
57. http biz lgservice com Multi Air Conditioner MODEL Multi Inverter Type CAUTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel Air Conditioner Service Manual CONTENTS Parti General IDIOMA Oise 2 1 Sately Precautions id eeashsadadnaeded T aad 3 2 Model tin YU Divinas ER T 6 3 NOMEeNCIA Uri a Ai 11 Part2 Functions amp Control iii A aunaniGaiectdomuieanbaiieneees ataee 13 1 List of Functions amp CONTO Susini ia A 14 ZA FOW a a A TN L 16 JLA PNT YUNG A N T E A 18 4 Mstallat n FUNCUONS ui 19 Bs Rela Dily ui ASAS 23 6 Convenience Functions amp Controls oocccccccccccccncnnnonnnonononccnnccnnonononononnnnnnnss 24 7 Special Function e KIT oca da 36 Part3 COMMUN ODIO A al 39 Ve COMPFESSOR usvnsci l EA TT EA 40 2 SLED TFEGUENGCY CONTO nica aia 42 3 Reversing Valve Operaton cocooooooocccccononnccnonocononancnccnnnnnnononononnnnnnnnnnnnnnnnnnonnnnnns 43 4 DISCNAarge pipe CONTTOL 00 cours a A AA AA AAA 44 5 INpPut Current CONT O vrs 45 6 OUTGOOF Fan CONTO luciana dd 46 7DETFOST COMMUN iii al 47 BEV CONVO ascii ARA Ai 48 9 Oil restoration operation vivacidad 50 10 Compressor warm up control logic oooooconnnncncccnccnconcnnnnnnononononononoss 50 Ti Heat SINK CONTO dica a A N aaa 51 PARE A TOSU RUIN us E dee ie 52 1 E heck before TeSt RUN vesical 53 2 TeSt RUN FIOW CAFE u
58. iia 31 AA AA A o A mn eke et enema rt 32 6 6 Sleep Timer Operation sida 34 Al OM AA EE 34 CIO VVGORIY POMO AA 34 511 TWO Thermistor CO PU last 35 7 Special UM CUO So KIA rca a 36 TU ZONE GON TO laa aaa 36 FLOW AMDISN GOMOD seas cc edad tian it 36 A sta ncepnedeseaneustenmacapneesmgouaige 37 TA AO Elevation Gnl n 37 73 DetrostGontrol He ai iia 38 Copyright 2007 LG Electronics Inc All right reserved 13 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls Category Function Description Remark Auto swing left amp right Horizontal Airflow Direction control Optional Auto swing up amp down Vertical Airflow Direction control Optional Chaos swing up amp down Vertical Airflow Direction control Optional Airflow Airflow steps fan cool heat Indoor Fan speed Control Chaos wind auto wind Indoor Fan speed Control by chaos pattern Optional Jet cool Power wind Powerful cooling mode Swirl wind Swing Distribute amp stir the Air inside Optional Deodorizing filter Air filtration using Deodorizing filter Air purifying Plasma air purifier Air filtration using plasma filter Optional Pre filter Air filtration using pre filter washable anti fungus Drain pump Drain water pump Optional E S P control Changeable External Static Pressure Optional Installation Electric heater operation Electric heater Optional High ceiling opera
59. in defrost control between the indoor and outdoor fans are turned off e Compressor 2minutes delay After compressor off the compressor can restart minimum 2 minutes later NOTE Some Models are different by temperature of thermo ON OFF CST Duct CVT type indoor unit matched with Single Outdoor unit Multi Outdoor unit Multi V Outdoor unit CST Duct CVT type indoor unit matched with Universal Outdoor unit Thermo ON 2 C above setting temp Thermo ON Setting temp Thermo OFF 4 C above setting temp Thermo OFF 3 C above setting temp Copyright 2007 LG Electronics Inc All right reserved 26 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls E Heating Mode Operation Details The unit will operate according to the setting by the remote controller and the operation diagram is shown as following Indoor unit Heat Exchanger temperature Intake Air Temperature Setting Temperature 3 C Thermo OFF Setting Temperature Thermo ON Seti Indoor fan Off Low aie d speed 4way valve e Compressor off interval A While the indoor Heat Exchanger temperature is higher than 40 C fan operates at low speed when it becomes lower than 40 C fan stops For eluminating latent heat loss fan operates at low speed for 10 seconds periodically Indoor unit Heat Exchanger temperature 33 C Outdoor fan Setting fan Setting fan 4way V
60. ing frequency of compressor cannot be changed within 30 seconds not emergency conditions e Compressor turned off when intake air temperature is in between 0 5 C of the setting temp limit for three minutes continuously intake air temperature reaches below 1 0 C of the temperature of setting temp e Compressors two minutes time delay After compressor off the compressor can restart minimum 2 minutes later Copyright 2007 LG Electronics Inc All right reserved 29 Only for training and service purposes LGE Internal Use Only Part 2 Functions Controls 6 1 2 Heating Mode Thermo 40 OFF 42 C Thermo ON Setting Temp T7 INV Comp High lt Low Comp OFF High lt Low Comp OFF Frequency Constant Comp Comp ON Comp OFF Comp ON Comp OFF e Operating frequency of compressor depend on the load condition The difference between the room temp and set temp frequency restrictions e f compressor operates at some frequency the operating frequency of compressor cannot be changed within 30 sec onds e Condition of compressor turned off When intake air temperature reaches 4 C above the setting temperature e Condition of compressor turned on When intake air temperature reaches 2 C above the setting temperature Condition of indoor fan turned off While in compressor on indoor pipe temp lt 20 C While in compressor off indoor pipe temp lt 30 C e While
61. ions amp Controls 6 5 Child Lock Function This function prevents children or others from tampering with the control buttons on the unit It is then controlled by the remote controller e All the buttons on indoor display panel will blocked e The unit will be controlled only by remote controller The function is used to restrict children to not to use the air conditioner carelessly CL is an abbreviated form of Child Lock Function setup pa 1 If you press the preset and minute setup button for LL 3 seconds at the same time the operation condi mo A tion switches to the child lock function and will be indicated as CL on the indication monitor 8 g O At that time remote control doesn t switch to the O selected mode and CL appears on the indication O monitor for 3 seconds if you press another button However it normally performs the actions of the D KAOH room temperature indication function and wireless o o remote control PLASMA IC w o e Function cancel D 1 Press the preset and minute setup button over 3 seconds at the same time In that case the child lock function cancels and will be indicated as the previous condition 7 Y AUTO SWING OPERATION SET TEMP FAN SPEED SUB FUNCTION 6 6 Forced operation e To operate the appliance by force in case when the remote control is lost the forced operation s
62. isconnect the charge hose from the vacuum pump Vacuum pump oil If the vacuum pump oil becomes dirty or depleted replenish as needed Copyright 2007 LG Electronics Inc All right reserved 64 Only for training and service purposes LGE Internal Use Only Gas side N Check valve Charging cylinder 1 e Procedure 1 Connect the charge hose to the charging cylinder Connect the charge hose which you dis con nected from the vacuum pump to the valve at the bottom of the cylinder If you are using a gas cylinder also use a scale and reverse the cylinder so that the sys tem can be charged with liquid 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air Be careful of the liquid refriger ant The procedure is the same if using a gas cylinder 3 Open the valve Lo side on the charge set and charge the system with liquid refrigerant If the system can not be charged with the spec ified amount of refrigerant it can be charged with a little at a time approximately 150g each time while operating the air conditioner in the cooling cycle however one time is not suffi cient wait approximately 1 minute and then repeat the procedure pumping down pin Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 5 Trouble Shooting Outdoor unit Thi
63. k Check output the CT Sensor DC 2 5 0 2V 48 56k Check output pin 1 2 of the CT Sensor 5V a FAP wi lt CT Sensing Check Point gt DAROCA _ RON y es lt Inverter PCB gt lt CT Sensing Check Point gt Copyright 2007 LG Electronics Inc All right reserved 90 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting posi Cause of error Check point amp Normal condition e Check point amp Normal condition e Check theCN_ L CN_ N Connection DC Link Low voltage ISSO e At not operating DC Link voltage 280V T 140Vdc l l e At Comp operating DC Link voltage 340V 7 Error Diagnosis and Countermeasure Flow Chart No Is input voltage normal Check L N Voltage is 220V 15 Yes No Is Inverter PCB assembly Check connection from terminal block to Power connection normal Inverter PCB assembly CN L CN N Yes No Is Inverter PCB Normal Replace inverter PCB assembly Yes l Recheck power and installation condition Copyright 2007 LG Electronics Inc All right reserved 91 LGE Internal Use Only Only for training and service purposes 5 Trouble Shooting Check Point 1 Check the WCN_P L P N Connection condition at the Main PCB Refer to outdoor wiring diagram 2 Check the DC Link voltage at not operating 280V f 3 Check the DC Link voltage at Comp operating 340V f 4 Check DC Link Sensing Signal 2 4 2 8V Refer the Pict
64. k the PCB ASM P No Check sum e Check the poor soldering Model Gross max capacity Max single indoor unit capacity A2UW146FA3 21k A2UW166FAO A2UW166FA1 24k A3UW186FAO A3UW216FA3 A4UW246FA3 Check Point CH 51 e CH 60 1 Check the indoor unit capacity 1 Check the insertion condition of EEPROM 2 Check the poor soldering Copyright 2007 LG Electronics Inc All right reserved 83 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting ral Cause of error Check point amp Normal condition Condenser e Condenser pipe sensor pipe sensor detected high temp high temp 65 C e Check the load condition e Check the sensor of Condenser pipe sensor Heat sink sensor e Heat sink sensor e Check the fan is locked detected high i temp high temp 85 C Check the sensor of heat sink Heat Sink temp Toff C T2 C T1 C COMP Frequency Normal Normal Hz Check Point CH 61 e CH 62 1 Check the install condition for over load 1 Check the fan is locked Refrigerant Pipe length Blocked 2 Check the Outdoor temp is very high Copyright 2007 LG Electronics Inc All right reserved 84 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting gt A4UW276FA3 A5UW306FA3 A5UW406FA3 A7UW406FA3 A8UW486FA3 A9UW566FA3 pad i Cause of error Check point amp Normal condition e Power input AC 220V Outdoor Ind
65. l 5 Inverter PCB assembly damage input current sensing part AC input instant over cur Inverter PCB input power rent error current is over 48A peak Matter of software for 2ms E Error Diagnosis and Countermeasure Flow Chart 1 Check Pipe clogging distortion No 2 Check Covering Indoor Outdoor Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure gt Reassemble or manage if abnormality found Is installation condition normal Yes Check L N phase voltage is 220V 10 gt Check connection condition and wiring if power is abnormal No Is input voltage normal 1 Check L N connection condition Is AC input Wire connection 2 Check wire disconnection and wiring condition normal gt Reassemble if abnormality found 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact gt Reassemble if abnormality found Is compressor Wire connection condition normal Is inverter PCB eee Check inverter PCB assembly IPM normality normal gt Replace inverter PCB assembly Recheck power and installation condition Copyright 2007 LG Electronics Inc All right reserved 115 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting gt 27 30 40k lt Main PCB wiring Check Point gt SS i y
66. l Use Only 5 Trouble Shooting 6 3 The Compressor Outdoor Fan are don t operate Turn on the main power Operate Cooling Mode by setting the disired temperature of the remote controller is less than one of the Indoor temperature by 1 C at least When in air circulation mode compressor outdoor fan is stopped Check the sensor for Indoor temperature is attatched as close as to be effected by the themperature of Heat Exchange EVA When the sensor circuit for Indoor temperature and connector are in bad connection or are not engaged Compressor Outdoor fan is stopped e Check the related circuit of RO2H 12 1K RO1H 1K RO4H 6 2K RO3H 1K CO1H 102 C02H 102 Micom pin No 4 42 e Check the Indoor temperature sensor is disconnected or not about 10K at 25 C Check the Relay RY PWR RY START for driving Compressor e Check the voltage between brown and blue cable of terminal to connect the Outdoor About AC220V 240V e Check the related circuit of relay in Outdoor PCB Ass y Check Point Comp ON Comp OFF Between Micom No 19 and DC 5V DC OV GND Between ICO1M No 10 and DC 1V DC 12V GND Turn off main power Check the electrical wiring diagram of Outdoor side Check the open or short of connecting wires between Indoor and Outdoor Copyright 2007 LG Electronics Inc All right reserved 69 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting 6 4 When indoor Fan does
67. l connection condition bad contact gt Reassemble if abnormality found Is compressor Wire connection condition normal Yes No Is inverter PCB assembly gt Check inverter PCB assembly PFCM normality normal gt Replace inverter PCB assembly Yes Recheck power and installation condition x PFCM Moudle checking method Set the multi tester to diode mode Check short between input signal pin which are placed below PFC Module 3 Replace PCB assembly if it is short between pins except No 4 5 pins Ah caution PFCM module No 4 5 pins are internal short state Copyright 2007 LG Electronics Inc All right reserved 99 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting pened Cause of error Check point amp Normal condition 1 Input voltage abnormal L N Inverter DC link high Inv PCB DC link voltage voltage error supplied over 420V 2 ODU inverter PCB damage DC Link voltage sensing part E Error Diagnosis and Countermeasure Flow Chart Is input voltage normal Check L N Voltage is 220V 15 Yes Is Inverter PCB assembly No Check connection from terminal block to Power connection normal Inverter PCB assembly CN L CN N Yes No Is Inverter PCB Normal Replace inverter PCB assembly Recheck power and installation condition Copyright 2007 LG Electronics Inc All right reserved 100 LGE Internal Use O
68. ly 5 Trouble Shooting peral Cause of error Check point amp Normal condition e An instant over current in the U V W phase Comp lock The abnormal connection of U V W e Over load condition Overcharging of refrigerant Pipe length Outdoor Fan is stop e Poor insulation of compressor e Instant over current DC PEAK on Fault e Over Rated current e Poor insulation of IPM E Error Diagnosis and Countermeasure Flow Chart Check Pipe clogging distortion Check Covering Indoor Outdoor Unit Check EEV connector assemble condition normal operation Check refrigerant pressure Reassemble or manage if abnormality found Is installation condition normal Check resistance between each terminal of compressor 0 34 0 35 7 Check insulation resistance between compressor terminal and pipe over 50M Replace compressor if abnormality found Are the resistance Between each phase and insulation resistance of Inverter compressor normal Check inverter PCB assembly U V W connector connection condition Is compressor Check wire disconnection and wiring Wire la Check compressor terminal connection condition condition normal bad contact Reassemble if abnormality found Check inverter PCB assembly IPM normality Replace inverter PCB assembly Is inverter PCB assembly normal Yes Recheck power and installation condition E Comp checking method Resistance Q at 20
69. mal Check L N Voltage is 220V 15 Is Inverter PCB Normal Recheck power and installation condition Replace inverter PCB assembly Check Point 1 Check the Input Voltage L N gt 220V 10 2 Check Input Voltage Sensor output voltage 2 5Vdc 10 lt Input Power Source Check Point gt Copyright 2007 LG Electronics Inc All right reserved 104 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting gt 27 30 40k 5 FIL APWM lt Inverter PCB gt lt CT Sensing Check Point gt gt 48 56k lt Inverter PCB gt lt CT Sensing Check Point gt Copyright 2007 LG Electronics Inc All right reserved 105 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting pened Cause of error Check point amp Normal condition Transmission error Main controller of Master 1 Power cable or transmission cable is not between Inverter PCB gt unit of Master unit can t connected Main PCB receive signal from 2 Defect of outdoor Main fuse Noise Filter inverter controller 3 Defect of outdoor Main inverter PCB E Error diagnosis and countermeasure flow chart No Is noise filter or fuse No A Replace noise filter or fuse normal Is transmission LED Yellow of inverter compressor PCB on Yes Yes Replace inverter compressor PCB Is transmission cable No a Re connect transmission cable connected correctl
70. manner as the following table e f more than two troubles occur simultaneously primarily the highest trouble fo error code is expressed e After error occurrence if error is released error LED is also released simultaneously e To operate again on the occurrence of error code be sure to turn off the power and then turn on e Having or not of error code is different from Model Indoor Error Description No Error LED 1 Red oe Indoor Status Indoor Room themistor error 1time 9 Oe Communcation error between in and out 5times O OFF Indoor Out Piping sensor error 6times OY Differnt mode operation times Y Outdoor Error _ LED 1 LED 2 E d Description Red Green 00 02 Indoor in piping sensor error 03 Remote controller error 04 05 06 07 ON 2times Y OFF 3times Y OFF Drain Pump error 4times Y OFF OFF OFF OFF Indoor Status CT 2 Max CT ames o Off Off DC Link Low Volt 2times OY 3times Off Off Off ff Low Voltage Over Voltage 2times O 5times O DC Compressor Position Error 2times Q 6times PSC PFC Fault Error 2times 7times O O 2 2 2 2 DC Link High Volt 2times O 8times O Off 2 COMP Over Current 2times O 9times O O 4 4 CT Error 3times OY ttime D Pipe High Normal 3times 3times Q CT Sensor Open Short 4times O ff Off Off Off Off INV D PipeTh Error Open Short 4times Y Off Off Off Off ff Outdoor Air
71. midity is relativery higher temperature difference is smaller When the room air humidity is relatively lower temperature difference is larger 2 Check temperature and pressure of refrigeration cycle in cooling mode Suction pressure Temperature of Compared with Discharge Air Compared Cause of Trouble Description the normal value with the normal valve Defective compressor Current is low Defective 4 way reverse valve Excessive amount of High pressure does not quickly refrigerant rise at the beginning of operation Insufficient amount of Current is low refrigerant Leakage Clogging NOTICE 1 The suction pressure is usually 8 5 9 5kg cm2G Cooling at normal condition R410A 2 The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty Copyright 2007 LG Electronics Inc All right reserved 66 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting 6 1 The Product doesn t operate at all Turn off the main power and wait for 10 seconds Turn on the main power again Primarily the operating condition of Micom is O K from the indoor unit Check Remote controller amp Receiver Check CN DISP1 CN DISP2_ of indoor PCB A Beeping sound is made Yes No Check the voltage of power supply AC220V AC240V 50Hz and check for the following The voltage of main power supply The voltage applied t
72. mote Controller Wired remote controller for hotel use Optional for hotel use Wireless remote controller Wireless remote controller simple Optional simple Wireless LCD remote control Wireless LCD remote control Optional neral central controller CAC network General central controle General central controller Optional Non LGAP function Dry contact Dry contact Optional Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 14 LGE Internal Use Only Part 2 Functions amp Controls Category Function Description Remark Network Solution LGAP Network Solution LGAP Optional CAC network PDI PDI power distribution indicator function Power Distribution Indicator PI 485 Network control using PI 485 Internet Optional Zone control control the operation of the Air conditioning unit where each zone Low ambient operation For operation at low temp Space Control Vanes angle can be controlled by pair Optional Auto Elevation Grille is automatically down to clean Optional Defrost Deicing Condenser frost prevention High pressure switch Detect high pressure for safety Optional Low pressure switch Detect low pressure for safety Optional Functions for Phase protection Misconnection prevention for three phase Optional outdoor Restart delay For overload prevention 3 minutes Self diagnosis Error code displays Soft start Soft start for compressor Optional Test function T
73. n Power module failure protection by checking the temperature of heat sink There is a temperature sensor for checking the heat sink temperature 11 2 Heat sink sensor failure error Short Check if temperature gt 130 C Open Check if temperature lt 30 C System will go in self diagnosis error 65 is displayed and product stops 11 3 Heat sink temperature control a Heat sink temperature lt T2 No limitation on compressor frequency b T2 lt heat sink temperature lt Toff Compressor frequency down by 5 Hz c Heat sink temperature gt Toff Compressor will be off System will stop if this situation occurs 5 times in 1 hour and error code will be generated also self diagnosis will start If high temperature situation occurs 5 times in 1 hr system counts 1 error and after that 4 times if this situation occurs system stops and give error code If the temperature reached Toff condition system will count 5 times after that and system will stop with error code Heat Sink temp Toff 85 Option C T2 75 Option C T1 70 Option C Set Set Set Copyright 2008 LG Electronics Inc All right reserved 31 Only for training and service purposes LGE Internal Use Only 4 Test Run M 4 Test Run Ts GHECK before TestRlUNiia a 53 2 1ESURUN FIOWCha lu aia 54 3 WEST RUNNINO serinin 55 Copyright 2007 LG Electronics Inc All right reserved 52 Only for training and service purposes LGE Internal Use Only 4
74. n the time set by the timer is reached e If the appliance is on pause at the time set by the timer the pause continues 6 10 Weekly Program e f necessary an operator can make an On Off reservation of the product for a period of one week On Off schedule of operation for a period of ONE week e No need to turn the unit On OFF manually during working days On Off time is scheduled in micom of the wired remote control Operation Time Table Example Setting Mon Tue Temp 25 C 25 C 25 C On 09 00 08 00 09 00 off 12 00 17 00 12 00 Copyright 2007 LG Electronics Inc All right reserved 34 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 6 11 Two Thermistor Control There may be a significant difference between temperature taken at the installed product indoor temperature Two ther mistor control provides option to control temperature by referring any of the two temperatures With help of the slide switch at the back of the wired remote controller selection of the thermistor for controlling the unit can be One thermistor is in the Indoor unit amp the one is in the LCD wired remote E Two Thermistor System 6 11 1 Open the rear cover of the wired remote controller to set the mode 6 11 2 Select one of three selectable modes as follows e Position 1 The room temperature is controlled by the thermistor of the main body e Position 2
75. nl Only for training and service purposes y 5 Trouble Shooting Check Point 1 Check the CN_ L CN_ N Connection condition at the Inverter PCB Refer to outdoor wiring diagram 2 Check the DC Link voltage at not operating 280V 7 3 Check the DC Link voltage at Comp operating 340V 7 4 Check DC Link Sensing Signal 2 4 2 8V Refer the Picture q1 lt DC_LINK Sensing Check Point gt lt DC Link Voltage Check Point gt Copyright 2007 LG Electronics Inc All right reserved 101 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting gt 48 56k lt Inverter PCB gt A LOOMP U COPG COMPU OS i 1 i lt DC_LINK Sensing Check Point gt Copyright 2007 LG Electronics Inc All right reserved 102 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting Display Cause of error Check point Normal condition code 1 Overload operation Pipe clogging Covering EEV defect Ref over charge 2 Compressor damage Insulation damage Motor damage 3 Input voltage low 4 ODU inverter PCB assembly damage Inverter compressor over Inverter compressor input current current is over 30A E Error Diagnosis and Countermeasure Flow Chart 1 Check Pipe clogging distortion 2 Check Covering Indoor Outdoor Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure g
76. nput voltage TRANS1 50Hz DC12V 14007 D Check Point e CH 24 1 Check the connection of CN_PRESS 2 Check the install condition for over load 3 Check the SVC V V open 4 Check the leakage of refrigerant Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes S W open 5 Trouble Shooting Check point amp Normal condition e Check the connection of CN_ Press e Check the components e Abnormal Input voltage e Check the power source 140Vac 300Vac f Check the components y 1 Y En LONAS CH 25 1 Check the power source 2 Check the components Trans1 B Diode Diode Resistance 79 LGE Internal Use Only 5 Trouble Shooting pened Cause of error Check point amp Normal condition e Check the connection of comp wire U V W e Malfunction of compressor e Check the component of IPM detection parts DC Compressor e Compressor Position position detect error e Check the component of IGBT PSC Fault e Over current at IGBT Check the components Check Point e CH 26 e CH 27 1 Check the connection of UV W 1 Check the component of IGBT 2 Check the insulation of IPM part 2 Check the components 3 Check the compressor same with CH21 IGBT RO4S NF1 BD025 Copyright 2007 LG Electronics Inc All right reserved 80 Only for training and service
77. nsor is abnormal gt Repair or Change the PCB Copyright 2007 LG Electronics Inc All right reserved 2 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting pane Cause of error Check point amp Normal condition er e Connection of wire Soma on e Open Short e Main PCB Volt DC12V Wired R C e Wrong connection Noise interferenes Wired R C Indoor Unit 12V S GND 12V S GND e a a sn A y 12Vdc 12Vdc Check the Volt Check the Volt Check Point 1 Check the wire connection Open Short gt Repair the connection 2 Check the soldering state of connector Soldered poorly Repair or Change the PCB 3 Check the volt Of main PCB power source DC 12V DC 5V gt Repair or Change the main PCB 4 Check the installation of wired remote controller Noise interference gt Adjust the state of installation Copyright 2007 LG Electronics Inc All right reserved 73 op LGE Internal Use Only Only for training and service purposes 5 Trouble Shooting panal Cause of error Check point Normal condition e Indoor unit installation Inclination e The connection of wire Drain pump Float switch 04 Drain pump e Float switch Open e Drain pump power input 220V Float switch Normal short e Drain tube installation CN Float w PCB 687 i a 4 ASM 6871A10140 CN CHC TAA SH SH 94V 04 n xr Zy ng PASTE 9 i i sy CN Float dl E l Po
78. ny leakage of refrigerant M4 118N cm 12kgf cm Mb5 196N cm 20kgf cm M6 245N cm 25kgf cm MB8 588N cm 60kgf cm Copyright 2007 LG Electronics Inc All right reserved 5 7 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting IE 5 Trouble Shooting 1 Self diagnosis Function rada 59 2i PUMP DOW AA A 63 9 VAG UANO aiar a acetates aes cates ae ees ecw ncideccece trite beseetadewtaiatie 64 A GaS Carin odie 65 BC CO Pasto E EE 66 6 Electone Parts iii 67 Copyright 2007 LG Electronics Inc All right reserved 58 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting 1 1 Error Indicator Indoor e The function is to self diagnosis air conditioner and express the troubles if there is any trouble e Error mark is displayed on display window of indoor units and wired remote controller and LED of outdoor unit control board e If more than two troubles occur simultaneously lower number of error code is first displayed e After error occurs if error is released error LED is also released simultaneously E 0 1 digit 10 digit Ex Error 21 DC Peak 4 i 2 Times i j 2 Times i 2 Times 10 digit 1 Sec iisen O 1 See 1 2 Indoor Error Indoor Status Air sensor open short Open Short Off Inlet pipe sensor Open Short Off Communication Indoor lt gt Wired R Control Communication Poorly Contents C
79. o the unit The connecting method of Indoor Outdoor connecting cable each color The P C B Assembly Fuse Noise Filter Power Module Bridge Diode etc The operation check of the Indoor P C B Ass y Procedure Specification Remedy 1 The input voltage of power mod 1 AC230V 30V 1 Check the power outlet ule Check the rated voltage 2 The output voltage of power mod 2 12V 3V 2 Replace ule P C B Ass y 4 IC04D 7805 4 DC5V 4 Replace P C B Ass y 5 ICO1A KIA7036 5 The voltage of micom pin 19 5 Replace P C B Ass y DC4 5VT Copyright 2007 LG Electronics Inc All right reserved 67 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting 6 2 The Product doesn t operate with the remote controller Turn on the main power A Beeping sound is made No from the indoor unit Refer to 10 1 Yes Check the voltage of power Is it possible to turn on the unit No AC220V AC240V 50Hz by ON OFF button on display Yes Is the remote controller No When the mark 4 is displayed working properly in LCD screen replace battery Yes Check the contact point of CN DISP 1 2 connector Re connector Check display P C B Assembly Voltage between CN DISP1 8 6 should be DC 5V If problem still persists Replace display PCB Copyright 2007 LG Electronics Inc All right reserved 68 Only for training and service purposes LGE Interna
80. of temperature difference Indoor Temp and Setting Temp Target frequency step Step base exceeds maximum step the Step base value follows the maximum step value The compressor get the minimum step in case Step base value is lower than the minimum step of operating capacity Copyright 2008 LG Electronics Inc All right reserved 42 Only for training and service purposes LGE Internal Use Only Part 3 Control logic 1 At the starting outdoor is powered on indoor is not reversing valve continues OFF cooling 2 For the cooling and defrosting operation valve OFF for the heating operation valve ON 3 Method of changing mode from heating to defrosting As defrosting starts Inverter compressor Hz is lowered to 30Hz for 5 sec and the valve is OFF for the defrost mode refer working process of each component in defrosting and returning to heating mode 4 Method of changing mode from defrosting to heating As the defrosting is finished inverter compressor frequency is lowered to 30Hz for 10 sec And the valve is ON for the heating mode 5 If the operating mode is changed to heating from cooling 3 min restarting rule is applied and reversing valve position is changed within 30 sec after compressor turns OFF 6 If the compressor is stopped during heating mode by remote controller operation or error mode reversing valve position is changed to OFF in 30 sec after compressor turns OFF 7 If the comp
81. on e According to the setting temperature selected by Fuzzy rule when the intake air temp is 0 5 C or more below the set ting temp the compressor is turned off When 0 5 C or more above the setting temp the compressor is turned on Compressor ON Temp gt Setting Temp 0 5 C Compressor OFF Temp gt Setting Temp 0 5 C e At the beginning of Fuzzy mode operation the setting temperature is automatically selected according to the intake air temp at that time 26 C lt Intake Air Temp gt 25 C 24 C lt Intake Air Temp lt 26 C gt Intake Air Temp 1 C 22 C lt Intake Air Temp lt 24 C gt Intake Air Temp 0 5 C 18 C lt Intake Air Temp lt 22 C gt Intake Air Temp Intake Air Temp lt 18 C gt 18 C e When the Fuzzy key Temperature Control key is input after the initial setting temperature is selected the Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature automatically accord ing to the Fuzzy rule e While in Fuzzy operation the airflow speed of the indoor fan repeats the low airflow speed or pause as in dehumidifica tion operation Copyright 2007 LG Electronics Inc All right reserved 29 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 6 3 3 Fuzzy Operation for Heating e According to the setting temperature selected by Fuzzy rule when the intake air temp is 3 C or more above the setting temp the comp
82. oor Title e The connector for transmission is disconnected Communication e Communication poorly The connecting wires are misconnected Indoor gt Outdoor e The communication line is shorted at GND e Transmission circuit of outdoor PCB is abnormal e Transmission circuit of indoor PCB is abnormal Check Point 1 Check the input power AC230V Outdoor Indoor unit 2 Check the communication wires are correctly connected Adjust the connection of wire Confirm the wire of Live Neutral 3 Check the resistance between communication line and GND Normal Over 2MQ 4 Check the connector for communication is correctly con nected 5 If one indoor unit is operated normally outdoor PCB is no problem Check the another indoor unit CHO5 is displayed at indoor unit CH53 is displayed at outdoor unit 6 If all indoor unit is displayed CHO5 but outdoor PCB not display CH53 Check the CN_COM and CN_POWER is correctly connected e 27 30 40k 1 In Case of CH53 Check the Connection gt L N at the ter minal block e 48 56k 1 In Case of CHO5 Check the Connection gt CN POWER CN COMM at the Main PCB 2 In Case of CH53 Check the Connection gt CN COMM at the Main PCB gt L N at the terminal block _ a al a a nin wenn ein aie a3 id 14 lt MAIN PCB gt Copyright 2007 LG Electronics Inc All right reserved 85 Only for training and service purposes LGE Internal Use On
83. oorly e Internal circuit error e Normal resistor 4 5Vdc at 25 C plugged e Normal voltage e Normal resistor 2 5Vdc at 25 C plugged e Normal voltage e Normal resistor 2 5Vdc at 25 C plugged e Normal voltage e Normal resistor 2 5Vdc at 25 C plugged e Normal voltage 200KQ at 25 C Unplugged 10KQ at 25 C Unplugged 5KQ at 25 C Unplugged 5KQ at 25 C Unplugged e Open Short e Soldered poorly e Internal circuit error e Normal resistor 4 5Vdc at 25 C plugged e Normal voltage 200KQ at 25 C Unplugged 46 47 D pipe sensor Constant 65 Heat sink sensor Q C h M at Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes e Open Short e Soldered poorly e Internal circuit error Check Point e Normal resistor e Normal voltage 10KQ at 25 C Unplugged 2 5Vdc at 25 C plugged 1 Estimate the resistance of each sensor Unplugged 2 Estimate the voltage of each sensor Plugged 3 If the resistance of the sensor is O kQ or then sensor is abnormal If the voltage of the sensor is O V or 5Vdc then sensor is abnormal 82 LGE Internal Use Only 5 Trouble Shooting pane Cause of error Check point amp Normal condition e Over capacity e Check the indoor unit capacity Sana Combination e Check the combination table EEPROM Checksum error e Chec
84. or e Check the component of IPM detection parts DC Compressor e Compressor Position Starting fail error E Error Diagnosis and Countermeasure Flow Chart Check Pipe clogging distortion Check Covering Indoor Outdoor Unit Check EEV connector assemble condition normal operation Check refrigerant pressure Reassemble or manage if abnormality found Is installation condition normal Check resistance between each terminal of compressor 1 083 1 1230 5 Check insulation resistance between compressor terminal and pipe over 50M Replace compressor if abnormality found Are the resistance Between each phase and insulation resistance of Inverter compressor normal Check inverter PCB assembly U V W connector connection condition Is compressor Check wire disconnection and wiring Wire connection Check compressor terminal connection condition condition normal bad contact Reassemble if abnormality found Check inverter PCB assembly IPM normality Replace inverter PCB assembly Is inverter PCB assembly normal Yes Recheck power and installation condition Check Point 1 Check the connection condition of PCB 2 Check the connection condition of Comp U V W wire 3 Check the comp resistor and insulation resistance 4 Check the IPM Refer 106 page 5 Check the pressure of refrigerant 6 Check the Service Valve Open Copyright 2007 LG Electronics Inc
85. or 3 minutes then connect the charge set to the service port of the 3 way valve Connect the charge hose with the push pin to the service port 4 Air purging of the charge hose Open the low pressure valve on the charge set slightly to air purge from the charge hose 5 Set the 2 way valve to the closed position Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 5 Trouble Shooting Outdoor unit 6 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 1kg cm g 7 Immediately set the 3 way valve to the closed position Do this quickly so that the gauge ends up indi cating 3 to 5kg cm g 8 Disconnect the charge set and mount the 2 way and 3 way valve s stem nuts and the ser vice port nut Use torque wrench to tighten the service port nut to a torque of 1 8 kg m Be sure to check for gas leakage 63 LGE Internal Use Only 5 Trouble Shooting Liquid side Outdoor unit N Vacuum pump YO Lo Q OPEN ay qe OPEN e Procedure 1 Connect the vacuum pump to the center hose 3 Close the valve Lo side on the charge set of charge set center hose turn off the vacuum pump and confirm that the gauge needle does not move approxima 2 Evacuation for approximately one hour tely 5 minutes after turning off the vacuum Confirm that the gauge needle has moved pump toward 0 8Torr 4 D
86. purposes LGE Internal Use Only 5 Trouble Shooting pre i Cause of error Check point amp Normal condition D pipe Inverter e Check the discharge pipe sensor for INV temp high e Discharge sensor e Check the install condition for over load 105 C 1 Inverter temp high e Check the leakage of refrigerant e Check the SVC V V open e Check the discharge pipe sensor for Cons e Discharge sensor e Check the install condition for over load Cons temp high e Check the leakage of refrigerant e Check the SVC V V open D pipe Constant temp high 105 C T D Pipe temp Toff 105 C T2 95 C T1 90 C COMP i Ma Check Point e CH 32 e CH 33 1 Check the install condition for over load 1 Check the install condition for over load 2 Check the SVC V V open 2 Check the SVC V V open 3 Check the leakage of refrigerant 3 Check the leakage of refrigerant 4 Check the constant compressor same with CH21 Copyright 2007 LG Electronics Inc All right reserved 81 LGE Internal Use Only Only for training and service purposes 5 Trouble Shooting ral Cause of error Check point amp Normal condition Air sensor Suction Pipe sensor D pipe sensor Inverter Condenser Pipe sensor e Open Short e Soldered poorly e Internal circuit error e Open Short e Soldered poorly e Internal circuit error e Open Short e Soldered poorly e Internal circuit error e Open Short e Soldered p
87. r equipment for limiting starting current e Control device can control up to 16 indoor equipments Remote Ae Controller Copyright 2007 LG Electronics Inc All right reserved 32 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 6 7 3 Group Control Optional Wiring e You can use a group control operation after connecting the brown and yellow wire of each air conditioner e Remove the resistor OP 7 in remote controller e lt operates maximum 16 Units by only one Wired Remote Controller and each Unit starts sequentially to prevent overcurrent Wiring design Main PCB ON Indoor Unit1 __ __ ndoor Unit2 _____IndoorUnit16 Terminal Local Supply Terminal Local Supply Terminal Local Supply Block Block Block Connector Connector l Connector I RED 12V SE MECTN Felson S Main PCB Vea tic 416 in 2 Main PCB tay Je BR O 2 n Sr BR GND BR GND A Slide Switch Wired Remote Controller Features e Use Only One Wired Remote Controller with several air conditioners max 16 Units e Random starting to prevent overcurrent A CAUTION e Be careful not to exchange the color of wires e The maximum length of connecting wire should be below 200m 259 on connect ing each units e Use a wire more than 0 5mm2 Copyright 2007 LG Electronics Inc All right reserved 33
88. rature Check resistance between NO 24 pin and NO 25 pin sensing part normal of PEC module gt 7KQ 10 at 25 C gt Replace PCB if abnormality found Check Point 1 Check resistance between No 19 pin and NO 20 pin of PCB PFC module 2 Check resistance between No 24 pin and NO 25 pin of PCB PFC module only 48 56k 3 Resistance value should be in 7kQ 10 at 25 C 4 Check the PFC Module No 19 20 and IPM Module No 24 25 pin soldering condition Copyright 2007 LG Electronics Inc All right reserved 111 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting gt 27 30 40k PFCM Measuring resistance between No 19 20 pin gt 48 56k YN end sm wae PFCM IPM Measuring resistance Measuring resistance between No 19 20 pin between No 24 25 pin Copyright 2007 LG Electronics Inc All right reserved 112 LGE Internal Use Only Only for training and service purposes 5 Trouble Shooting pou Cause of error Check point amp Normal condition 1 ODU fan locking lesstor5 sec when ODU 2 Heatsink assembly of INV PCB assemble condi tion abnormal E fan starts or 40 RPM or POE less after fan starting 3 Defect of temperature sensing circuit part defect l of INV PCB Fan RPM is 10RPM or Error Diagnosis and Countermeasure Flow Chart Check ODU Fan Motor assemble condition and fan locking gt Reassemble or replace if abnormality found
89. ressor is stopped during heating mode by Thermistor signal reversing valve will remain in heating position Copyright 2008 LG Electronics Inc All right reserved 43 Only for training and service purposes LGE Internal Use Only Part 3 Control logic 1 There can be two situations a Sensor is failed error code for sensor failure will be generated b Abnormal high temperature discharge temperature error code for high discharge will be generated Both cases unit will stop Compressor working 1 If discharge pipe temperature lt T1 No limitation on compressor frequency 2 T2 lt discharge pipe temperature lt Toff Hysteresis control Compressor frequency down by 5 pulse amp Expansion valve up by 10 pulse in every 1 min If LEV is in the starting control it will follow starting control first 3 discharge pipe temperature gt Toff then compressor will be OFF System will stop if this situation occurs 5 times in 1 hour and error code will be generated also self diagnosis will start Discharge pipe temp Toff 105 Option C 12 95 Option C T1 90 Option C COMP Hz 5Hz Option Stop control Expansion valve Option up Option up Copyright 2008 LG Electronics Inc All right reserved 44 Only for training and service purposes LGE Internal Use Only Part 3 Control logic 5 1 Function Controlling total current to protect power semiconductor devices from burn out by the low current including
90. ressor is turned off When below the setting temp the compressor is turned on Compressor ON Temp gt Setting Temp Compressor OFF Temp gt Setting Temp 3 C e At the beginning of Fuzzy mode operation the setting temperature is automatically selected according to the intake air temp at that time 20 C lt Intake Air Temp gt Intake Air Temp 0 5 C Intake Air Temp lt 20 C gt 20 C e When the Fuzzy key Temperature Control key is input after the initial setting temperature is selected the Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature automatically accord ing to the Fuzzy rule e While in Fuzzy operation the airflow speed of the indoor fan is set to the high or the medium according to the intake air temperature and the setting temperature Notes The Temp of Comp Turn ON and OFF is different in heating mode and fuzzy operation for heating Please refer page 11 6 4 Auto restart Operation e Whenever there is electricity failure to the unit and after resumption of the power unit will start in the same mode prior to the power failure Memorized condition are on off condition operating mode cooling heating set temperature and fan speed The unit will memorize the above conditions and start with same memorized condition Copyright 2007 LG Electronics Inc All right reserved 30 Only for training and service purposes LGE Internal Use Only Part 2 Funct
91. ror e Normal resistor 4 5Vdc at 25 C plugged e Normal voltage e Normal resistor 2 5Vdc at 25 C plugged e Normal voltage e Normal resistor 2 5Vdc at 25 C plugged e Normal voltage e Normal resistor 2 5Vdc at 25 C plugged e Normal voltage 200KQ at 25 C Unplugged 10KQ at 25 C Unplugged 5KQ at 25 C Unplugged 5KQ at 25 C Unplugged e Open Short e Soldered poorly e Internal circuit error e Normal resistor 4 5Vdc at 25 C plugged e Normal voltage 200KQ at 25 C Unplugged 46 47 D pipe sensor Constant 65 Heat sink sensor Q C h M at Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes e Open Short e Soldered poorly e Internal circuit error Check Point e Normal resistor e Normal voltage 10KQ at 25 C Unplugged 2 5Vdc at 25 C plugged 1 Estimate the resistance of each sensor Unplugged 2 Estimate the voltage of each sensor Plugged 3 If the resistance of the sensor is O kQ or then sensor is abnormal If the voltage of the sensor is O V or 5Vdc then sensor is abnormal 130 LGE Internal Use Only 5 Trouble Shooting pane Cause of error Check point amp Normal condition e Check the indoor unit capacity Over capacity Over capacity e Check the combination table e Check the PCB ASM P No Over capacity e Check sum er
92. ror e Check the poor soldering Gross Max Capacity Btu h Max Single Indoor Unit Capacity Btu h A7UW428FA3 A8UW488FA3 AQUW548FA3 Check Point e CH 51 e CH 60 1 Check the indoor unit capacity 1 Check the insertion condition of EEPROM 2 Check the poor soldering Copyright 2007 LG Electronics Inc All right reserved 137 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting pened Cause of error Check point amp Normal condition e 3 phase wrong wiring of e Abnormal Main PCB outdoor unit Reverse e No connection of CN_Phase Phase omission of e Changed R S T connection order phase 3 phase wrong wiring of main outdoor unit E Error Diagnosis and Countermeasure Flow Chart 1 Check the Connection condition of PCBs No 1 Input Output R S T N wire Connection of Noise Filter 2 Check reverse connecting and non connecting for CN L1 R CN L2 S CN L3 T of the Inverter PCB Yes 3 Check the CN AC 220V Connector of the Inverter PCB and T N connector of the Noise Filter No 2 Check the connection or damage of power source fuses Is PCB connection Normal Is input voltage normal Yes R S S T T R phase voltage is 380V ze 10 R N S N T N phase voltage is 220V 210 Recheck power and installation condition Check connection condition and wiring if power is abnormal Fuse lt Noise Filter Connection Check gt CN AC 220V
93. rved 55 Only for training and service purposes LGE Internal Use Only 4 Test Run 3 2 CVT Type 3 2 1 Connection of power supply 1 Connect the power supply cord to the independent power supply e Circuit breaker is required 2 Prepare the remote control e Insert two batteries provided Remove the battery cover from the remote controller e Slide the cover according to the arrow direction Insert the two batteries Two RO3 or AAA dry cell batteries or equivalent e Be sure that the and directions are correct e Be sure that both batteries are new Re attach the cover e Slide it back into position 3 Operate the unit for fifteen minutes or more 3 2 2 Evaluation of the performance 1 Measure the temperature of the intake and discharge air 2 Ensure the difference between the intake temperature and the discharge one is more than 8 C Cooling or reversely Heating Thermometer 3 2 3 Selection of the slide switch according to installation method 1 In case the indoor unit is installed on the floor please change the side switch which is on the Main PCB Assembly to the BOTTOM state 2 In case the indoor unit is installed under the ceiling please change the slide switch which is on the Main PCB Assembly to the CEILING state x The initial state of the slide switch is set for the bottom installation CEILING BOTTOM Copyright 2007 LG Electronics Inc All right reserv
94. s 3 Position V L e Minimum E S P setting amp Fan speed is varied according to the state of dampers by micom Maximum 8mmAq Minimum OmmAq 4 1 3 Move the slide switch to set position Ja o 8 SOP dsg LUN ATA de n p W TH Slide switch for ceiling height 4 1 4 Close the rear cover and check if it works normally Copyright 2007 LG Electronics Inc All right reserved 19 e LGE Internal Use Only Only for training and service purposes Part 2 Functions amp Controls 4 1 5 How to Set E S P Procedure of RPM change Ex External Static pressure is 4mmAq for Model 36K e To protect the unit compressor is designed to be off during E S P setting Push the On Off button The unit will start D sk as da Qe Time Timer H we ES LILI Push the Up of Down button for E S P adjustment And adjust the number which you want In this example the number is 225 Refer to the table 1 on the next page g FAN SPEED CRS Note The range of selection is from 1 254 Since the display is two Digit only If the range selection is above 100 then the third digit will appear in the screen as shown Shift the fan speed mode by pressing the fan speed button And then Adjust numbers of next steps by repeating the stage 3 In this example the numbers are 237 and 243 respectly ES Push the Timer and Wind button simultaneously for more th
95. s is different from previous procedures Because you are charging with liquid refrigerant from the gas side absolutely do not attempt to charge with larger amounts of liquid refrigerant while operating the air conditioner 4 Immediately disconnect the charge hose from the 3 way valve s service port Stopping partway will allow the gas to be dis charged If the system has been charged with liquid refrigerant while operating the air conditioner turn off the air conditioner before disconnecting the hose 5 Mount the valve stem nuts and the service port nut Use torque wrench to tighten the service port nut to a torque of 1 8 kg m Be sure to check for gas leakage 65 LGE Internal Use Only 5 Trouble Shooting Trouble analysis 1 Check temperature difference between intake and discharge air and check for the operating current too Symptom Supposed Caused Temp difference approx 0 C All amount of refrigerant leaked out Current less than 80 of rated current Check refrigeration cycle Temp difference approx 8 C Refrigerant leakage Clog of refrigeration cycle Current less than 80 of rated current Defective Compressor Temp difference less than 8 C Excessive amount of refrigerant Current over the rated current Temp difference over 8 C Normal NOTICE Temperature difference between intake and discharge air depends on room air humidity When the room air hu
96. semble condition normal operation 4 Check refrigerant pressure gt Reassemble or manage if abnormality found 1 Check resistance between each terminal of compressor 1 083 1 1230 5 2 Check insulation resistance between compressor terminal and pipe over 50MQ gt Replace compressor if abnormality found 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact gt Reassemble if abnormality found Check connection between inverter PCB assembly and bridge diode misconnection disconnection gt wiring again if abnormality found Check R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 10 gt Check connection condition and wiring if power is abnormal Check inverter PCB assembly IPM normality gt Replace inverter PCB assembly 121 LGE Internal Use Only 5 Trouble Shooting Check Point 1 Check the power source 200 240V 2 Check the fan operation is right 3 Check the current 4 Check the install condition 5 Check the CT Sensor Output signal Check output pin 1 2 of the CT Sensor 5V ICO1G ACS754SCB 050 C Input Current R PFC CO7G ROSG 0 01u 2K 2012 1 2012 Input Current R INV t VW G C01 ROIG 0 01u 2K 2012 1 2012 CT Sensor Output at the INVERTER PCB Olu Copyright 2007 LG Electronics Inc All ri
97. sor Open Short 41 INV D Pipe Th Error EN Outdoor Air Th Error Cond Pipe Th Error 3times Y 4times Y times Y times Y 4times CT Circuit Malfunction time Open Short 4times Y Open Short 5times OY Open Short Suction Pipe Error 4times 6times Y Open Short Const D Pipe Th Error Atimes Y 7times O Open Short Capacity Over 5times Y time Q Over combination signal Error DSP Board lt gt Main Board 5times Y 2times Q Communication Poorly Signal Error Indoor lt gt Outdoor 5times Y 3times o Communication Poorly EEPROM Check Sum Error EE Cond Pipe Th High Heatsink Th High Cond Pipe Th Low Outdoor BLDC Fan Lock PFC Fault Error S W 6times Y 6times 6times Y 6times Y 6times Y 7times Y Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes time 2times Heatsink Temp High 3times Cond Temp Low Heatsink Th Error 6times 5times Open Short 7times Check Sum Mismatching Cond Temp High Outdoor Fan is not operating 3times Over Current of Outdoor Unit PFC 60 LGE Internal Use Only 1 3 Error Indicator 5 Trouble Shooting e The function is to self diagnoisis airconditioner and express the troubles identifically if there is any trouble e Error mark is ON OFF for the operation LED of evaporator body in the same
98. stall the panel and the cover of control box securely Otherwise there is risk of fire or electric shock due to dust water etc Indoor outdoor wiring connections must be secured tightly and the cable should be routed properly so that there is no force pulling the cable from the connection terminals Improper or loose connections can cause heat generation or fire Do not touch operate or repaire the product with wet hands Hoding the plug by hand when taking out Otherwise there is risk of electric shock or fire A CAUTION Do not turn on the breaker under condition that front panel and cabinet are removed Be sure to earth the air conditioner with an earthing conductor connected to the earthing terminal Conduct repair works after checking that the refrigerating cycle section has cooled down sufficiently Otherwise working on the unit the hot refrigerating cycle section can cause burns Do not tilt the unit when removing panels Otherwise the water inside the unit can spill and wet floor Do not use the welder in a well ventilated place Using the welder in an enclosed room can cause oxygen deficiency Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Copyright 2007 LG Electronics Inc All right reserved 4 Only for training and service purposes LGE Internal Use Only Part 1 General Information 1 2 Inspections after Repair WARNING
99. sure MB18AH NHO MB24AH NHO ii AMNHO96BTGO AMNH126BTGO AMNH186BTGO pressure MBO9AHL NTO MB12AHL NTO MB18AHL NTO Ceiling delia aa AMNHO9GB1A0 1 AMNH12GB1A0 1 ue E MBO9AHL N10 1 MB12AHL N10 1 static pressure Slim AMNH18GB2A0 1 AMNH24GB2A0 1 MB18AHL N20 1 MB24AHL N20 1 Built in AMNHO96BPAO AMNH126BPA0 MBO9AHB NPO MB12AHB NPO VE AMNHO96VEAO AMNH126VEAO MVO9AH NEO MV12AH NEO Ceiling amp floor VB AMNH186VBAO AMNH246VBAO MV18AH NBO MV24AH NBO Copyright 2007 LG Electronics Inc All right reserved 1 Only for training and service purposes LGE Internal Use Only Part 1 General Information 2 2 Outdoor units MULTI F EN A2UW146FA3 A2UW166FA0 A2UW166FA1 A3JUW186FAO a FM15AH UL3 FM17AH ULO FM17AH UL1 FM19AH UEO No of connectable indoor units Max 2 Max 3 Total capacity index of connectable kW 6 15 7 03 8 79 indoor units kBtu h 21 24 30 Power supply 10 220 240V 50Hz los JA inverter inverter Chassis A Heat pump A3UW216FA3 FM21AH UE3 A4UW246FA3 FM25AH UE3 A4UW276FA3 FM27AH UE3 No of connectable indoor units Max 3 Max 4 Total capacity index of connectable kW 9 67 11 4 12 0 indoor units kBtu h 33 39 41 Power supply 10 220 240V 50Hz JS JS JS inverter inverter inverter Chassis LG ps LG io la k E E io gt E Heat pump A5UW306FA3 FM30AH UE3 A5UW406FA3 FM38AH UH No of connectable indoor units Max 5 Total capacity
100. t Reassemble or manage if abnormality found Is installation condition normal 1 Check resistance between each terminal of compressor 0 188 7 2 Check insulation resistance between compressor Are the resistance Between each phase and insulation resistance of Inverter compressor normal No terminal and pipe over 50MQ gt Replace compressor if abnormality found Yes 1 Check inverter PCB assembly U V W connector connection condition No 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact gt Reassemble if abnormality found Is compressor Wire connection condition normal Yes No Check L N phase is 220V 15 gt Check connection condition and wiring if power is abnormal Is input voltage normal Yes No Check inverter PCB assembly IPM normality gt Replace inverter PCB assembly Is inverter PCB assembly normal Yes Recheck power and installation condition Copyright 2007 LG Electronics Inc All right reserved 103 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting pened Cause of error Check point amp Normal condition e Malfunction of current detection circuit C T Open Short e Initial current error e Check CT Sensor output voltage 2 5Vdc 5 Sensor Error E Error Diagnosis and Countermeasure Flow Chart Is input voltage nor
101. t the matching value from the table Value other than that in table will not give the combinations of airflow E S P which are mentioned in the table 2 Table data is based at 230V According to the fluctuation of voltage air flow rate varies Copyright 2007 LG Electronics Inc All right reserved Only for training and s ervice purposes 21 LGE Internal Use Only Part 2 Functions amp Controls 4 2 High Ceiling operation Function to Control the Air Volume by Ceiling Height Control of the air intensity has been made possible by employing a height control algorithm for the interior fan According to the height of the installation it provides variability of indoor fan motor rpm If the height of installation is low then you can adjust low rpm of indoor fan motor On the other hand if the height of the installation is high you can adjust high rpm of indoor fan motor Selection of speed can be done by slide switch at the back of the LCD wired remote dl on the m igher ceiling m Installation on the 3 2 2 7 normal height ceiling 3 Elevation Choice Conditions of Release When the elevation is low lower than 2 4m in height Operate the device at one level lower than the standard level e Low When the elevation is standard about 2 7m in height L Standard Operate the device at the standard air flow level lt Hij When the elevation is high higher than 3 0m in height Operate the device at
102. tential when the equipment is connected to the power cables This volt age is extremely dangerous and may cause death or severe injury if come in con tact with it Do not touch the discharging refrigerant gas during the repair work The discharging refrigerant gas The refrigerant gas can cause frostbite Release the refrigerant gas completely at a well ventilated place first Otherwise when the pipe is disconnected refrigerant gas or refrigerating machine oil discharges and it Can cause injury When the refrigerant gas leaks during work execute ventilation If the refrigerant gas touches to a fire poisonous gas generates A case of leakage of the refriger ant and the closed room full with gas is dangerous because a shortage of oxygen occurs Be sure to execute ventilation When removing the front panel or cabinet execute short circuit and discharge between high voltage capacitor terminals If discharge is not executed an electric shock is caused by high voltage resulted in a death or injury Do not turn the air conditioner ON or OFF by plugging or unplugging the power plug There is risk of fire or electrical shock Copyright 2007 LG Electronics Inc All right reserved 3 Only for training and service purposes LGE Internal Use Only Part 1 General Information Do not use a defective or underrated circuit breaker Use the correctly rated breaker and fuse Otherwise there is a risk of fire or electric shock In
103. tion Function to Control the Air Volume by Ceiling Height Optional Hot start To prevent cold wind blow on heating mode start Reliability Self diagnosis Error code displays Soft dry operation Dehumidification Auto changeover Cooling mode is automatically changed to heating mode and Optional vice verse P Auto clean After cooling operation this function makes the Optional evaporator dry Auto operation Air volume amp set temp are automatically selected for comfort OE eae a Optional artificial intelligence on Cooling Heating mode Auto restart operation When power returns after a power failure unit restarts in the previous operating mode Child lock Protect the unit operation without approval Optional Convenience Forced operation Operation without remote controller Group control Where several products are linked one specific control is Optional device can control a specific number of products Sleep mode Air volume amp set temp are automatically changed for com fortable sleep Timer on off Operation by Timer setting Timer weekly Operation by weekly reservation Two thermistor control Option to control temperature by referring thermistor in the Optional Indoor unit or the LCD wired remote Standard wired remote Standard wired remote controller Optional controller Deluxe wired remote controller Deluxe wired remote controller Optional simple wired remote controller Simple wired remote controller Optional Individual control Wired re
104. ure ARS Q F O lt Input Power Source Check Point gt WA lt DC_LINK Sensing Check Point gt lt DC Link Voltage Check Point gt Copyright 2007 LG Electronics Inc All right reserved 92 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting gt 48 56k lt Inverter PCB gt i X 1 7 s E LCOMPCL CORAL COMPUN s e a j lt DC_LINK Sensing Check Point gt Copyright 2007 LG Electronics Inc All right reserved 93 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting panal Cause of error Check point amp Normal condition e Check the connection CN_L PRESS H PRESS e Low High press Press S W Open S W open e Check the components E Error diagnosis and countermeasure flow chart Is high pressure switch connector connected to PCB No Connect securely Yes Is high pressure switch connector short during off time No Replace high pressure switch Yes No Is SVC valve open Open SVC valve Yes Is this error appeared No Re check momentary again after reset problem or not Yes Is high pressure more than 2500kPa at manifold gauge No Replace PCB Yes Is high pressure of LGMV similar as at manifold gauge No Replace high pressure sensor Yes Check pipe is blocked or not and take measure Copyright 2007 LG Electroni
105. ut the test run more than 5 minutes without fail Test run will be cancelled 18 minutes later auto matically E The forced operation is started by pressing button for 2 seconds Cassette Type The test run is started by pressing button for 5 sec onds Cassette Type The test run is started by pressing timer cancel button five times continuously Room type E To cancel the test run press any button 3 1 3 Settlement of outdoor unit E Anchor the outdoor unit with a bolt and nut 10mm tightly and horizontally on a concrete or rigid mount E When installing on the wall roof or rooftop anchor the mounting base securely with a nail or wire assuming the influence of wind and earthquake E In the case when the vibration of the unit is conveyed to the hose secure the unit with an anti vibration rubber Bolt Tubing connection 3 1 4 Evaluation of the performance Operate unit for 15 20 minutes then check the system refrigerant charge 1 Measure the pressure of the gas side service valve 2 Measure the temperature of the intake and discharge of air 3 Ensure the difference between the intake temperature and the discharge is more than 8 C Cooling or reverse ly Heating Discharge air Discharge temperature Intake temperature Discharge air y a Discharge temperature Intake temperature Discharge air Discharge temperature Copyright 2007 LG Electronics Inc All right rese
106. w Close Open Open Close Close Open Open Close Time LGE Internal Use Only Part 2 Functions amp Controls 3 Air purifying 3 1 PLASMA Air Purifying System The PLASMA Air Purifying System not only removes microscopic contaminants and dust but also removes house mites pollen and pet fur to help prevent allergic diseases like asthma This filter that can be used over and over again by simply washing with water Dust electrode discharge Dust particles lonizer Photo Catalyst Coated Mesh Vo VW E Q Q O ho Purified fresh Air Q z o lt Q 2 Q A A Generating plasma Odour g p Odour molecule ALI a S in pecs TANAVAVANAVAVAVAVANAVAY eV VV VV VV Copyright 2007 LG Electronics Inc All right reserved 1 Only for training and service purposes LGE Internal Use Only Part 2 Functions amp Controls 4 1 E S P External Static Pressure Setting 4 1 1 Open the rear cover of the wired remote controller to set the mode 4 1 2 Select one of three selectable modes as follows E Without Zone System 1 Position V H F H e This position sets the maximum E S P as a default set 2 Position V L e This position sets the minimum E S P as a default set E With Zone System 1 Position V H e Maximum E S P setting 4 Fan speed is varied according to the state of dampers by micom 2 Position F H e Maximum E S P setting amp Fan speed doesn t vary according to the opening amp closing of damper
107. y Yes No Is MAIN PCB normal Replace MAIN PCB Replace inverter compressor PCB Check Point Check the Transmission connector and LED Main amp Inverter gt 48 56k A gt LEDOIE a i ii lt Inverter PCB gt lt MAIN PCB gt Copyright 2007 LG Electronics Inc All right reserved 106 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting Display code Cause of error Check point amp Normal condition 1 EEPROM contact defect wrong insertion 2 Different EEPROM Version 3 ODU Inverter 4 Main PCB assembly damage Inverter PCB 4 Main EEPROM Access error EEPROM check sum error and Check SUM error E Error Diagnosis and Countermeasure Flow Chart 1 Check EEPROM insert direction connection condition Is EEPROM insertion normal 2 Check EEPROM Check SUM gt Replace if abnormality found Is inverter PCB assembly normal Replace inverter PCB assembly Yes y MAIN PCB assembly normal Replace MAIN PCB assembly Recheck power and installation condition Check Point Check the EEPROM Check sum amp Direction gt 27 30 40k lt MAIN PCB gt lt EEPROM Direction Check Point gt Copyright 2007 LG Electronics Inc All right reserved 107 Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting gt 48 56k o Dar Y pra y yu seale GOO A O sane as Ll ia a a Wy aka ais

Multi Air Conditioner SVC MANUAL(General)

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