LG APNH2433LAD Svc Manual Download Page 2

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LGE Internal Use Only

Air Conditioner Service Manual

CONTENTS

Part 1 General Information

..........................................................................................................2

1. Safety Precautions

........................................................................................................3

2. Model Line up

................................................................................................................6

3. Nomenclature

................................................................................................................7

Part 2 Functions & Controls

........................................................................................................8

1. List of Functions & Controls

........................................................................................9

2. Air flow

.........................................................................................................................11

3. Air purifying

.................................................................................................................13

4. Installation Functions

.................................................................................................16

5. Reliability

.....................................................................................................................19

6. Convenience Functions & Controls

.........................................................................20

Part 3 Control logic

....................................................................................................................31

1. Compressor

.................................................................................................................32

2. Step(frequency) control

..............................................................................................34

3. Reversing valve operaton

..........................................................................................37

4. Discharge pipe control

...............................................................................................38

5. Input Current Control

..................................................................................................39

6. Outdoor Fan Control

...................................................................................................41

7. Defrost Control

............................................................................................................43

8. LEV Control

.................................................................................................................44

9. Oil restoration operation

............................................................................................50

10. Compressor warm-up control logic

........................................................................50

11. Heat sink control

.......................................................................................................51

Part 4 Test Run

..........................................................................................................................52

1. Check before Test Run

...............................................................................................53

2. Test Run Flow chart

....................................................................................................54

Part 5 Trouble Shooting Guide

................................................................................................56

1. Self-diagnosis Function

.............................................................................................57

2. Pump Down

.................................................................................................................59

3. Evacuation

...................................................................................................................60

4. Gas Charging

...............................................................................................................61

5. Cycle Part

.....................................................................................................................62

6. Electronic Parts

...........................................................................................................63

Summary of Contents for APNH2433LAD

Page 1: ...itioner SVC MANUAL General MODEL Single A Inverter Type CAUTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel Internal Use Only http biz lgservice com ...

Page 2: ...ility 19 6 Convenience Functions Controls 20 Part 3 Control logic 31 1 Compressor 32 2 Step frequency control 34 3 Reversing valve operaton 37 4 Discharge pipe control 38 5 Input Current Control 39 6 Outdoor Fan Control 41 7 Defrost Control 43 8 LEV Control 44 9 Oil restoration operation 50 10 Compressor warm up control logic 50 11 Heat sink control 51 Part 4 Test Run 52 1 Check before Test Run 53...

Page 3: ... 2 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 1 Safety Precautions 3 2 Model Line up 6 3 Nomenclature 7 Part 1 General Information ...

Page 4: ...t 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...

Page 5: ... 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 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 Install the panel and the cover of control box securely Otherwise t...

Page 6: ...rge 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 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 ...

Page 7: ...AUUW243D LUU245HV AUUW423D LUU425HV No of connectable indoor units 1 Total capacity index of Btu h 24 000 42 000 connectable indoor units kW 7 1 12 5 Power supply 1Ø 208 230V 60Hz Chassis 24 000 7 1 42 000 12 5 ATNH243PLAD LCN245HV ATNH423MLAD LCN425HV APNH2433LAD LFN245HV APNH423TLAD LFN425HV Category Type Model Name Capacity Btu h kW Chassis 4way Ceiling cassette Floor Standing TP TM P3 PT High ...

Page 8: ... Ø 380V 415V 50Hz Capacity code Model Type C Cooling Only H Heat Pump R410A Universal Indoor Unit ATN Universal Ceiling Cassette Type Indoor Unit ABN Universal Ceiling Concealed Duct Type Indoor Unit AVN Universal Ceiling Floor Type Indoor Unit A U U H 1 8 6 A Serial Number Electric Standard Phase Volts Freq 6 1 3 1Ø 208V 230V 60Hz Ø 220V 240V 50Hz 8 3 Ø 380V 415V 50Hz Capacity code Model Type C C...

Page 9: ... 12 2 5 Chaos wind auto wind 12 2 6 Jet Cool Mode Operation 12 2 7 Swirl wind Swing 12 3 Air purifying 13 3 1 PLASMA Air Purifying System 13 4 Installation Functions 16 4 1 Installer Setting E S P 16 4 2 High Ceiling operation 17 5 Reliability 19 5 1 Hot start 19 5 2 Self diagnosis Function 19 5 3 Soft dry operation 19 6 Convenience Functions Controls 20 6 1 Auto changeover operation 20 6 2 Child ...

Page 10: ...Fan speed Control by chaos pattern Powerful cooling mode Distribute stir the Air inside Air filtration using Deodorizing filter Air filtration using plasma filter Air filtration using pre filter Drain water pump Changeable External Static Pressure Function to Control the Air Volume by Ceiling Height To prevent cold wind blow on heating mode start Error code displays Dehumidification Cooling mode i...

Page 11: ...ion Description Remark Network Solution LGAP PDI power distribution indicator Network control using PI 485 Internet control the operation of the Air conditioning unit where each zone For operation at low temp Vanes angle can be controlled by pair Grille is automatically down to clean Outdoor Control Compressor Control EEV Control FAN control Oil Return Control Oil equalizing Control Sump Heating C...

Page 12: ...t the left right louver automatically operates with the auto swing or it is fixed to the desired direction 2 2 Auto swing up down By the auto swing key input the upper lower vane automatically operates with the auto swing or it is fixed to the desired direction 2 3 Chaos swing up down By the Chaos swing key input the upper lower vane automatically operates with the chaos swing or it is fixed to th...

Page 13: ... the Jet Cool mode is operat ed In the Jet Cool mode the indoor fan is operated at super high speed for 30 min at cooling mode operation In the Jet Cool mode operation the room temperature is controlled to the setting temperature 18 C When the sleep timer mode is input while in the Jet Cool mode operation the Jet Cool mode has the priority When the Jet Cool key is input the upper lower vanes are r...

Page 14: ...stem 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 3 Air purifying Ionizer Photo Catalyst Coated Mesh Dust particles Odour Dust electrode discharge Odour molecule Generating plasma Polluted Air Purified fresh Air 4 8KV disc...

Page 17: ...t ESP step by pressing button 01 very low 02 low 03 medium 04 high 05 power 3 Move to ESP setting by pressing button 4 Press button to select ESP value 0 255 5 What is an E S P function This is the function that decides the strength of the wind for each wind level and because this function is to make the installation easier please do not use this function when using the remote controller If you se...

Page 18: ...change the ESP value 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 ot...

Page 19: ...save or release 4 Press button to exit or system will automatically exit after 25 seconds without any input 5 Ceiling height setting is available only for some products Ceiling height of Super high function may not exist depending on the indoor unit Refer to the product manual for more details Ceiling Height Level Description 01 Low Decrease the indoor airflow rate 1 step from standard level 02 St...

Page 20: ...midification 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 While compressor off the indoor fan repeats low airflow speed and stop While the intake air temp is between compressor on temp and compressor off temp 10 min dehumidification opera tion and 4 min compressor off repea...

Page 21: ... conditioner changes the operation mode automatically to keep indoor temperature 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 SET Temp 0 5 C 0 5 C 2 C 4 C 2 C Cooling operation Heating operation Cooling operation Cooling thermo off Heating thermo off Switching point...

Page 22: ...he difference between the room temp and the set temp frequency restrictions If the compressor operates at some frequency the operating frequency of compressor cannot be changed within 30 seconds not emergency conditions 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 tem...

Page 23: ...me frequency the operating frequency of compressor cannot be changed within 30 sec onds Condition of compressor turned off When intake air temperature reaches 4 C above the setting temperature 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 20 C Option While in compres...

Page 24: ...emperature 1min Minimum 3min 1min 3min Setting fan speed Setting fan speed Setting fan speed ON ON ON ON Low Low Low Low Low Lo Off Off Off ON OFF OFF Low fan during 10sec A A B B Intake Air Temperature Compressor off interval While the indoor Heat Exchanger temperature is higher than 27 C fan operates at low speed when it becomes lower than 26 C fan stops For eleminating latent heat loss fan oper...

Page 25: ...t is possible to control normally by wireless remote controller To release this setting keep pressing button until icon flash and then enter button Touched the fan speed and high temperature setting keys simultaneously for 3 seconds The display key will be locked with beep after 3 seconds 1 During Child Lock Operation Whenever you Touch any key on Display panel it will immediately display which me...

Page 26: ...shift After 3 seconds it will shift After pressing the buttons it will shift immediately After 3 seconds it will shift During Child Lock Operation Whenever you press any Button it will immediately display which means Button is Locked All the Button on the indoor unit will not work But the Button on the remote controller will work For releasing child lock Operation Press the fan speed button and Hi...

Page 27: ...f the indoor fan is automatically selected according to the temperature 6 5 2 Off Timer Operation When the set time is reached after the time is input by the remote control the appliance stops operating The timer LED is on when the off timer is input It is off when the time set by the timer is reached If the appliance is on pause at the time set by the timer the pause continues Part 2 Functions Co...

Page 28: ...Function Code Thermistor setting Press button for 4 seconds to enter the installer setting mode until timer segment display 01 01 1 Set Thermistor mode by pressing button 01 Remote Controller 02 Indoor 03 2TH 3 Press button to save or release 4 Press button to exit or system will automatically exit after 25 seconds without any input 5 Repeat pressing button to select Function code 04 Ex Setting Th...

Page 29: ...educe cooling heating efficiency and accumulate more electric power Therefore do clean the filter whenever cleaning time is expired Part 2 Functions Controls 6 7 Filter Sign clear This function is to clear the indicator of indoor filter cleaning Press button Repeat pressing button until the icon flash 1 When the flashing press the button to clear this display 2 ...

Page 30: ...n setting for 4 secs to enter installer setting mode until code displayed in timer segment 1 Press button to start 2 18 C cooling High Fan Speed Airflow direction mode will be operated during 18 minutes with ignoring room tem perature After running 18 minutes under test run mode system will automatically turn OFF In case of duct type the Airflow UP DOWN function is not displayed During test run mo...

Page 31: ... is possible to set the items are installed or not Function Code Existing condition Press button for 4 seconds to enter the installer setting mode until timer segment display 01 01 1 Select existing condition of each mode by pressing button 00 not installed 01 installed 3 Press button to save or release 4 Press button to exit or system will automatically exit after 25 seconds without any input 5 R...

Page 32: ...art 3 Control logic 3 Control logic 1 Compressor 32 2 Step frequency control 34 3 Reversing valve operaton 37 4 Discharge pipe control 38 5 Input Current Control 39 6 Outdoor Fan Control 41 7 Defrost Control 43 8 LEV Control 44 9 Oil restoration operation 50 10 Compressor warm up control logic 50 11 Heat sink control 51 ...

Page 33: ...nging 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 1 Compressor BLDC Motor IPM Inverter EMF MCU 16Bits U V W U V W X Y Z Position Detect Circuit 120 f P RPM F P RPM Revolutions Minute Frequenc...

Page 34: ...y Part 3 Control logic 1 2 Inverter compressor starting Target Step calculation method Step A Step 1 Frequency Min frequency 20 25Hz Step B Step A Target STEP 2 Step C Step B Target STEP 2 Step D Step C Target STEP 2 Step E Step D Target STEP 2 Target frequency Hz Step A Step B Step C Step D Time sec Step E frequency ...

Page 35: ...p Step Step base Long piping compensation x Step TAO x Step TAI x Step DTAI 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 2 Step frequency control System ON Setting Indoor data Outdoor data Calculation of set frequency Start syst...

Page 36: ...ogic 2 3 Setting value Cooling Step TAO step compensation by Outdoor temp Step TAI step compensation by Indoor temp Step DTAI Step Compensation of temperature difference between indoor temp and setting temp 40 110 10 38 43 32 Low ambient 100 Option 100 Option 18 Over load Pull down Temp C 30 38 24 15 Temp C Working ratio Working ratio ...

Page 37: ...p TAO step compensation by Outdoor temp Step TAI step compensation by Indoor temp Step DTAI Step Compensation of temperature difference between indoor temp and setting temp 40 110 18 4 10 32 Low Temperature working 100 Option 120 Option 100 Option 120 Option Over load Low Temperature working Over load Temperature C Temperature C Working ratio Working ratio 23 28 18 3 ...

Page 38: ...t 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 O...

Page 39: ...ssor frequency 2 T2 discharge pipe temperature º Toff Hysteresis control Compressor frequency down by 5 pulse 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 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 diagnos...

Page 40: ...ect in CT1 or CT2 detection 5 2 Operating process CT 1 detection 1 If total current exceeds CT1 value reduce inverter operation by 1 step Step down 10Hz from current step If new Hz is below minimum Hz of operation cooling 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...

Page 41: ...nternal Use Only Part 3 Control logic Model Cooling Heating CT1 CT2 CT1 CT2 1 Phase AUUW243D LUU245HV 16 19 17 19 AUUW423D LUU425HV 26 29 27 29 Current CT Frequency Hz Setting frequency Frequency fixed 5 Hz Option Down Frequency fixed Setting frequency Frequency fixed 5 Hz Option Down OFF CT2 CT1 1 CT1 ...

Page 42: ...r fan control 6 Outdoor Fan Control Model RPM Base Step Max Step Min Step 1 Pahse AUUW243D LUU245HV 670 700 200 AUUW423D LUU425HV 670 700 200 Outdoor Temperature Cooling Step Outdoor Temperature Heating Step 41 46 C Base Step 2 22 26 C Base Step 4 38 41 C Base Step 1 18 22 C Base Step 3 28 38 C Base Step 14 18 C Base Step 2 24 28 C Base Step 1 10 14 C Base Step 1 18 24 C Base Step 2 4 10 C Base St...

Page 43: ...outdoor fan works in ON OFF control If the pipe temperature is 0 10 C and it is falling rapidly in that case compressor will run for 5 min then it will go in low ambient control After the system is stopped by CT cut or heat sink cut off cycle will return to the normal operating control T pipe Cond Out Outdoor fan Setting value Setting value Off Off T2 10 Option C T1 4 Option C ...

Page 44: ... 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 æ 7 minutes 2 Piping temperature maintain 10 seconds Option in condition of more than 15 C Option 7 4 Defrosting Control Algorithm 7 Defrost Control Inverter Comp Outdoor Fan Outdoor LEV Indoor Fan Reversing Valve Sat...

Page 45: ...itions 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 o...

Page 46: ... 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 reach...

Page 47: ...agram T out T in Reversing valve High Pressure Switch T suc LEV Linear Expansion Valve T air T air T pipe T dis Compressor Heat Exchager Heat Exchager Cooling mode Heating mode T out Evaporator outlet Condenser inlet T in Evaporator inlet Condenser outlet T pipe Condenser out Evaporator inlet T suc Compressor suction Compressor suction T disp Compressor discharge Compressor discharge ...

Page 48: ...ability control Dis Superheating T dis_superheating T dis T pipe 20 C Option LEV pulse down T dis_superheating 20 Option C T dis_superheating 24 Option C Back to main control Heating Mode 1 Superheating control Main control Superheating T superheating Tsuc Tpipe 1 C Option LEV pulse up T superheating 1 C LEV pulse down T superheating 1 C 2 Discharge Superheating Control Reliability control Dis_Sup...

Page 49: ...tagnation Step control every 2 min response time Fully close set 0 200 pulse can hear knocking sound LEV Initialization Duration 90 sec Compressor ON Outdoor Fan ON Starting control Duration 240 sec On time control Duration continues Dis superheating control Tdsh Tdsh 20 C Option Tdsh 20 C Tsh 2 C Tsh 2 C Option Tdsh 0 C Option Tdsh 20 C Option Check Tin Close LEV Open LEV Close LEV Back to Main C...

Page 50: ... Step control every 2 min response time Fully close set 0 200 pulse can hear knocking sound LEV Initialization Duration 90 sec Compressor ON Outdoor Fan ON Starting control Duration 240 sec On time control Duration continues Dis superheating control Tdsh Tdsh 15 C Option Tdsh 15 C Tsh 1 C Tsh 1 C Option Tdsh 15 C Option Tdsh 15 C Option Check Tin Close LEV Open LEV Close LEV Back to Main Control C...

Page 51: ...ould 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 9 Oil restoration operation A function protecting inverter compressor from damages by increasing oil viscosity in low outdoor temperature For the control compressor operates in low frequencies Op...

Page 52: ...e T2 No limitation on compressor frequency b T2 heat sink temperature Toff Compressor frequency down by 5 Hz c Heat sink temperature 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...

Page 53: ... 52 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 4 Test Run 4 Test Run 1 Check before Test Run 53 2 Test Run Flow chart 54 ...

Page 54: ...e between power supply terminal block and ground Do not operate in the case of 2 0 MΩ 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 app...

Page 55: ...tart Refer to part4 6 Electric part Yes No Yes Refer to part4 5 Cycle part No Is hot air discharged After Hot Start Yes No Is there any temperature difference between intake and discharged air Yes No Is the operating current normal Yes Normal Refer to Troubleshooting Guide No Check the load In Out Temp Check pipe length and amount of refrigerant Check for abnormal sound in outdoor unit comp Fan ot...

Page 56: ...ecord trial run properties and store measured data etc 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 As to the structure and appearance check following items Is the circulation of air adequate Is the drainage OK Is the heat insula...

Page 57: ...nc All right reserved Only for training and service purposes LGE Internal Use Only 5 Trouble Shooting 5 Trouble Shooting 1 Self diagnosis Function 57 2 Pump Down 59 3 Evacuation 60 4 Gas Charging 61 5 Cycle Part 62 6 Electronic Parts 63 ...

Page 58: ...irst displayed After error occurs if error is released error LED is also released simultaneously 1 Time 1 Time 1 Time 2 Times 2 Times 2 Times 10 digit LED 1 digit LED 1 Sec 2 Sec 2 Sec 1 Sec 1 Sec 1 digit 10 digit Ex Error 21 DC Peak 1 2 Indoor Error Error code Description INV TPS LED 1 Red LED 2 Green Indoor Status 00 No Error ON 01 Indoor Room themistor error 1time OFF 02 Indoor in piping sensor...

Page 59: ...mes 4times OFF 25 Low voltage Over voltage 2times 5times OFF 26 DC Comp Position Error 2times 6times OFF 27 PFC PSC Fault Error 2times 7times OFF 28 DC Link High Volt 2times 8times OFF 29 COMP Over Current 2times 9times OFF 32 D Pipe High INV 3times 2times OFF 33 D Pipe High Normal 3times 3times OFF 39 Communication Error 3times 9times OFF 40 CT Sensor Open Short 4times O OFF 41 INV D PipeTh Error...

Page 60: ...ush 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 6 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 1kg cm2 g 7 Immediately set the 3 way valve to the closed position Do this quickly so that the gauge ends up indi cat...

Page 61: ...moved toward 0 8Torr 3 Close the valve Lo side on the charge set turn off the vacuum pump and confirm that the gauge needle does not move approxima tely 5 minutes after turning off the vacuum pump 4 Disconnect the charge hose from the vacuum pump Vacuum pump oil If the vacuum pump oil becomes dirty or depleted replenish as needed Lo Open Open Vacuum pump 3 Way valve Outdoor unit Liquid side Indoor...

Page 62: ...ge 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 4 Immediately disconnect the charge hose from th...

Page 63: ...nce is larger 2 Check temperature and pressure of refrigeration cycle in cooling mode 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 NOTICE NOTICE Suction pressure Compared with Cause of Trouble Description the normal value Defective compressor Curren...

Page 64: ...dy 1 Check the power outlet 2 Replace P C B Ass y Turn on the main power again Turn off the main power and wait for 10 seconds Yes No A Beeping sound is made from the indoor unit Check the voltage of power supply and check for the following The voltage of main power supply The voltage applied to the unit The connecting method of Indoor Outdoor connecting cable each color The P C B Assembly Fuse No...

Page 65: ...played in LCD screen replace battery No Check the contact point of CN DISP 1 2 connector Re connector Check display P C B Assembly Voltage between CN DISP1 should be DC 5V If problem still persists Replace display PCB 3 6 Be sure to disconnect the power cable plug from the plug socket before disassembling the equipment for a repair Internal components and circuit boards are at main potential when ...

Page 66: ...cted or not about 10K at 25 C Check the Relay RY PWR RY START for driving Compressor Check the voltage between brown and blue cable of terminal to connect the Outdoor About AC220V 240V Check the related circuit of relay in Outdoor PCB Ass y 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 6 3 The Compressor ...

Page 67: ...ck the related pattern Check the SSR SSR Open Indoor Fan Motor never operate SSR short Indoor Fan Motor always operates in case of ON or OFF 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 Be sure to disconnect the power cable plug from the plug socket before disassembling the equipment for a repair Internal components and circ...

Page 68: ...a soldering short at following terminals Between 1 2 3 and 4 of MICOM Between 17 18 19 and 20 of MICOM Between 4 5 6 and 7 of IC01M Between 5 6 7 and 8 of IC01M 6 5 When the louver does not operate If there are no problems after above checks Confirm the assembly condition that are catching and interfering parts in the link of the vertical louver Be sure to disconnect the power cable plug from the ...

Page 69: ...t 25 C Yes Yes No Correct connection Yes No Correct connection No Correct connection Check Flow Chart 01 02 06 Indoor air sensor Indoor inlet pipe sensor Indoor outlet pipe sensor Connector connection error Faulty PCB Faulty sensor Open Short Connector connection error Faulty PCB Faulty sensor Open Short Connector connection error Faulty PCB Faulty sensor Open Short Normal resistor 10KΩ at 25 C Un...

Page 70: ...V Is the soldering state of connector is normal Yes Yes No Correct connection Or change connection wire Is it normal Yes No Correct connection Or change the PCB Check the installation of wired remote controller Noise interference Is it normal No Adjust the state of installation No Re soldering component Or change the PCB Check Flow Chart CN REMO 03 Communication Error Wired remote controller Conne...

Page 71: ...Pump Yes No Correct connection Or re soldering PCB Is the resistance of Drain Pump Normal about 400Ω Yes No Change the Drain Pump Is the drain pump clean Yes No Clean drain pump No Clean float switch Is the resistance of f loat switch normal short Yes No Change the float switch Is it normal No Correct connection Or re soldering PCB Check Flow Chart CN Float CN Float 04 Drain pump Float switch Floa...

Page 72: ... status between PCB and fan motor Is it normal Yes No Correct connection Or re soldering PCB Check the DC Motor signal Is it normal No Change Indoor Motor Check Flow Chart 09 10 EEPROM Check sum Indoor BLDC motor fan lock Indoor Check sum error Fan motor break down Fan motor PCB poor contact Obstruction to the fan Check the poor soldering Change PCB Check the indoor fan motor Check the connection ...

Page 73: ... of wire Confirm the wire of Live Neutral Signal Check the resistance between communication line and GND Normal Over 2MΩ Is connector for communication correctly connected Is it normal Yes No Correct connection Check Flow Chart 05 53 Communication Indoor Outdoor The connector for trans mission is disconnected The connecting wires are misconnected The communication line is break Outdoor PCB is abno...

Page 74: ... No Change DC link capacitor Or Main PCB Remove obstruction Change outdoor fan or motor Change refrigerant No Change Compressor Check the electricity leakageof the compressor Refer to comp check table Check the input power Outdoor Indoor unit Is it normal Yes No Change Compressor Check Flow Chart Dc link voltage table Type Non operating Operating 1 Phase AUUW243D LUU245HV PFC DC300V 10 DC380V 10 A...

Page 75: ...c work Check DC link capacitor Is it normal Refer to belows Yes No No Change DC link capacitor Or Main PCB Remove obstruction Change outdoor fan or motor Change refrigerant No Change Compressor Check the electricity leakageof the compressor Refer to comp check table Check the input power Outdoor Indoor unit Is it normal Yes No Change Compressor Check Flow Chart Dc link voltage table Type Non opera...

Page 76: ...pressor Check Flow Chart Dc link voltage table Check TRANS1 Check DC link voltage Type Non operating Operating 1 Phase AUUW243D LUU245HV PFC DC300V 10 DC380V 10 AUUW423D LUU425HV PFC DC300V 10 DC380V 10 Model DC Link Voltage V CN_TRANS 1 23 28 DC Link Low voltage DC Link High voltage 1ph DC link volt is 140Vdc 3ph DC link volt is 250Vdc 1ph DC link volt is 140Vdc 3ph DC link volt is 250Vdc Check t...

Page 77: ...ldering state of connector is normal Yes Yes No Correct connection No Re soldering component Yes No Open SVC Valve Is it normal Change main PCB Yes No Re vaccuming system Re charging Check Flow Chart CN_PRESS Switch Low pressure switch High pressure switch Spec 0 03 Mpa 4 3 Mpa Model AUUW243D LUU245HV AUUW423D LUU425HV Pressure switch table 24 Press S W Open Low High press S W open Check the conne...

Page 78: ...link capacitor Or Main PCB Remove obstruction Change outdoor fan or motor Change refrigerant No Change Compressor Check the electricity leakageof the compressor Refer to comp check table Check the input power Outdoor Indoor unit Is it normal Yes No Change Compressor Check Flow Chart Dc link voltage table Type Non operating Operating 1 Phase PFC DC300V 10 DC380V 10 PFC DC300V 10 DC380V 10 Model DC ...

Page 79: ...r assemble condition normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found Yes Is input voltage normal No Check L N phase is 220V 15 Check connection condition and wiring if power is abnormal Yes Is inverter PCB assembly normal No Check inverter PCB assembly IPM normality Replace inverter PCB assembly Are the resistance Between each phase and insulation resistance...

Page 80: ...INV Micom Communication Error Between PFC Micom and INV Micom 1 Micom defect Circuit defect 2 Different Micom S W Version 3 ODU inverter PCB assembly damage Display code Title Cause of error Check point Normal condition Is Inverter PCB assembly normal No Replace inverter PCB assembly Is PFC Micom INV Micom S W Program normal No Upgrade Micom Program Yes Yes Recheck power and installation condition...

Page 81: ...utdoor Indoor unit Is it normal 230V 10 Change main PCB Check C01N Is it normal 4 0Vdc Check Check TRANS Is it normal Yes Yes Yes No Correct connection No Change Main PCB No Change TRANS Check Flow Chart TRANS C01N 40 C T Internal circuit Initial current error Malfunction of current detection circuit Open Short The voltage of C01N Is 4 0Vdc 25A Display code Title Cause of error Check point Normal ...

Page 82: ... condition for over load Check the leakage of refrigerant Check the SVC V V open Refer to sensor resistance table Display code Title Cause of error Check point Normal condition Is the resistance of the sensor is 200kΩ at 25 C Plug the sensor on Indoor unit PCB Estimate the Voltage of each sensor Repair or Change the PCB Check Over load condition Refrigerant leakage Condenser is blocked Outdoor fan...

Page 83: ...le Normal resistor 10KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Refer to sensor resistance table Normal resistor 5KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Refer to sensor resistance table Normal resistor 5KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Refer to sensor resistance table Display code Title Cause of error Check point Normal condition Ω 10kΩ...

Page 84: ...x combination Is it normal Check PCB Change EEPROM Check the the connection port Is it normal Yes Yes No Correct connection No Correct connection Check Flow Chart CH51 Check Flow Chart CH60 51 60 Over capacity EEPROM Check sum Over capacity Combination Check sum error Check the indoor unit capacity Check the combination table Check the connection port Check the poor soldering Display code Title Ca...

Page 85: ...oor Main fuse Noise Filter 3 Defect of outdoor Main inverter PCB Display code Title Cause of error Check point Normal condition Error diagnosis and countermeasure flow chart Is transmission LED Yellow of inverter compressor PCB on Yes No Is noise filter or fuse normal Replace noise filter or fuse No Replace inverter compressor PCB Is transmission cable connected correctly Yes No Re connect transmi...

Page 86: ... 10kΩ at 25 C Is the voltage of the sensor is 4 5Vdc 2 5Vdc at 25 C Yes Yes No Remove obstruction Change outdoor fan or motor Change refrigerant Yes Yes Yes No Change the sensor No Change the sensor No Correct connection Check Flow Chart 61 62 Condenser pipe sensor temp high Heat sink sensor temp high condenser pipe sensordetected high temp 65 C heat sink sensor detected high temp 85 C Check the l...

Page 87: ...atus between PCB and fan motor Check the DC Motor signal Is it normal Yes Yes No Remove obstruction No Correct connection Or re soldering PCB Is it normal Repair or Change the PCB Yes No Change Indoor Motor Check Flow Chart 67 BLDC motor fan lock Outdoor Fan motor break down Fan motor PCB poor contact Obstruction to the fan Check the indoor fan motor Check the connection status between PCB and fan...

Page 88: ... Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found Is installation condition normal Is compressor Wire connection condition normal 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 Reassemble if abnor...

Page 89: ...8 1 116 55 1 48 0 962 60 1 23 0 828 65 1 03 0 714 70 0 87 0 615 75 0 74 0 531 80 0 63 0 459 85 0 54 0 397 90 0 46 0 345 95 0 4 0 3 100 0 34 0 262 Pipe Temp B Constant 3977 Std Temp 25 Resistance 10 Temp Resistance Volt 30 204 35 4 72 25 146 97 4 62 20 107 09 4 492 15 79 4 336 10 58 95 4 149 5 44 47 3 931 0 33 9 3 685 5 26 09 3 416 10 20 27 3 131 15 15 89 2 838 20 12 55 2 546 25 10 2 262 30 8 03 1 ...

Page 90: ... 55 2 96 3 32 60 2 47 3 11 65 2 07 2 9 70 1 74 2 69 75 1 48 2 48 80 1 26 2 28 85 1 07 2 09 90 0 92 1 9 95 0 8 1 73 100 0 69 1 57 Heatsink Temp B Constant 3500 Std Temp 25 Resistance 200 Temp Resistance Volt 30 2845 99 4 969 0 585 66 4 851 5 465 17 4 814 10 372 49 4 77 15 300 58 4 717 20 244 33 4 657 25 200 4 587 30 164 79 4 508 35 136 64 4 418 40 113 98 4 318 45 95 62 4 208 50 80 65 4 088 55 68 38...

Page 91: ...More than 2MΩ All models V U W Ω Comp U V W 1 Phase AUUW126C 0 65 0 65 0 65 AUUW186C 0 65 0 65 0 65 AUUW246D 0 75 0 75 0 75 AUUW306D 0 75 0 75 0 75 AUUW366D 0 44 0 44 0 44 AUUW426D 0 44 0 44 0 44 AUUW486D 0 44 0 44 0 44 AUUW606D 0 44 0 44 0 44 3 Phase AUUW368D 1 84 1 84 1 84 AUUW428D 1 08 1 08 1 08 AUUW488D 1 08 1 08 1 08 AUUW608D 1 08 1 08 1 08 Model Resistance Ω at 20 Check resistance of the com...

Page 92: ...P NO MFL47149005 MARCH 2009 ...

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