LG ACHH Series Manual Download

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The phenomena from main component failure

7. The phenomena from main component failure

The phenomena from main component failure

When system fault occurs, the error code is displayed on the indoor unit display or remote control display.

Compressor

Outdoor

fan

Outdoor

EEV

Not operating

Stop during running

Abnormal noise
during running

High pressure error
in cooling mode
operation

No operation sound
after switching ON
the power supply

Low pressure error or
discharge tempera-
ture error

Motor insulation broken

Strainer clogged

Oil leakage

Motor insulation failure

R-S-T misconnection

Motor failure,
bad ventilation around
outdoor heat exchanger

Coil failure

EEV closed

Check resistance between terminals and
chassis

Change strainer

Check oil amount after opening oil port

Check resistance between terminals and
chassis

Check compressor R-S-T connection

Check the fan operation to confirm proper
motor functioning. Switch OFF the outdoor
unit and remove obstacles, if any, around
the HEX. Check connector

Service necessary

Please replace necessary

Component

Phenomenon

Cause

Check method and Trouble shooting

Summary of Contents for ACHH Series

Page 1: ...MANUAL MODEL ACHH Series CAUTION Before Servicing the unit read the safety precautions in SVC manual Only for authorized service personnel CONFIDENTIAL Copyright 2018 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 2: ...2 Specification 8 3 Functions 9 4 Piping Diagrams 10 5 Wiring Diagrams 13 6 Exploded View 22 7 The phenomena from main component failure 34 8 Error code check 55 9 Additional functions 106 Air cooled Inverter Scroll Chiller 2 ...

Page 3: ...g wind or earthquake and install the unit at the specified place Improper installation may cause the unit to topple and result in injury When installing and moving the Product to another site do not charge it with a different refrigerant from the refrigerant specified on the unit If a different refrigerant or air is mixed with the original refriger ant the refrigerant cycle may malfunction and the...

Page 4: ...witch thermal switch or other protection device is shorted and operated forcibly or parts other than those spec ified by LGE are used fire or explosion may result Ventilate before operating Product when gas leaked out It may cause explosion fire and burn Use a vacuum pump or Inert nitrogen gas when doing leakage test or air purge Do not compress air or Oxygen and Do not use Flammable gases Otherwi...

Page 5: ...could cause product mal function or inefficient operation When installing the unit in a hospital communication station or similar place provide sufficient protection against noise The inverter equipment private power generator high frequency medical equipment or radio communication equipment may cause the Product to operate erroneously or fail to operate On the other hand the Product may affect su...

Page 6: ...he power at least 6 hours before starting operation Starting operation immediately after turning on the main power switch can result in severe damage to internal parts Keep the power switch turned on during the operational season Do not touch any of the refrigerant piping during and after operation It can cause a burn or frostbite Do not operate the Product with the panels or guards removed Rotati...

Page 7: ... 4 1400 4 Sump Heater W 60 2 60 2 60 4 60 4 Refrigrant Type R410A R410A R410A R410A Amout of Charged Kg 7 0 kg X 2 7 0 kg X 2 7 0 kg X 4 7 0 kg X 4 GWP 2087 5 2087 5 2087 5 2087 5 t CO2eq 29 23 29 23 58 45 58 45 Evaporator Type plate plate plate plate Pressure drop kPa 21 5 28 7 18 7 21 5 Operating maxium pressure Refrigrant Water kg cm2 42 10 42 10 42 10 42 10 Standard Flow Cooling Heating LPM 18...

Page 8: ...Type PVE PVE PVE PVE Oil charge cc 1400 4 1400 6 1400 6 1400 6 Sump Heater W 60 4 60 6 60 6 60 6 Refrigrant Type R410A R410A R410A R410A Amout of Charged Kg 7 0 kg X 4 7 0 kg X 6 7 0 kg X 6 7 0 kg X 6 GWP 2087 5 2087 5 2087 5 2087 5 t CO2eq 58 45 87 68 87 68 87 68 Evaporator Type plate plate plate plate Pressure drop kPa 28 7 18 7 21 5 28 7 Operating maxium pressure Refrigrant Water kg cm2 42 10 4...

Page 9: ...overheat temperature control O Between phase protection equipment O 3 minutes delayed operation O Freezing prevention O Compression ratio limit O Self diagnosis O Convenience Automatic Re start O Remote control O Low noise operation at night O Automatic operation O Schedule operation O Network ModBus O Classification O Applicable X Non applicable Irrelevant ...

Page 10: ...agrams 4 Piping Diagrams M S Cooling Heating Fan motor 4 way valve Pressure sensor Pressure switch Solenoid valve Check valve Strainer Electonic expantion Valve Expansion valve Temperature sensor Compressor 2 1 UNIT ...

Page 11: ...Diagrams M S Cooling Heating Fan motor 4 way valve Pressure sensor Pressure switch Solenoid valve Check valve Strainer Electonic expantion Valve Expansion valve Temperature sensor Compressor 2 Compressor 2 2 UNIT ...

Page 12: ...ms Compressor 2 Compressor 2 Compressor 2 3 UNIT M S Cooling Heating Fan motor 4 way valve Pressure sensor Pressure switch Solenoid valve Check valve Strainer Electonic expantion Valve Expansion valve Temperature sensor ...

Page 13: ...Wiring Diagrams 13 5 Wiring Diagrams 1 UNIT 2 UNIT Main 3 UNIT Main ...

Page 14: ... 14 Wiring Diagrams 2 UNIT Sub 3 UNIT Sub2 ...

Page 15: ...Wiring Diagrams 15 3 UNIT Sub1 ...

Page 16: ... B Modbus Communication Connector CH4 A B Ambient Temp UI1_G Load Flow Switch Input UI15_G Load Pump Interlock Contact Input UI16_G Remote On OFF GRD_DI1 Remote CO Hp GRD_DI2 Remote Alarm GRD_DI3 Alarm Status Output Contact Do1 C _COM Running Status Output Contact Do2 Load Pump Output Contact Heater Output Contact Do3 Do5 ...

Page 17: ...Wiring Diagrams 17 ADAPTER cn power cn dc ...

Page 18: ...Wiring Diagrams 18 Cycle Main PCB FQ34 36bRSWLRQ SFE VZ34G FQbIODVKbZULWH FQbIODVKbUG FQbOJPYbZK VZ37F VZ34F VZ35F VZ36F FQbLQSXWbEO FQbKSbVZbJ FQbLQYbEN FQbH WbZK FQbH WbEO FQbFRPZUbZK FQbFRPPbEO ...

Page 19: ...External PCB FQb58bEO FQb68bEO FQb67bUG FQb66bEO FQb65bEN FQb64bEN FQb56bJ FQb54bUG FQb4 bZK FQb48bEU FQb46bZK FQb4 bRU FQb43bZK FQb3 bEO FQb73bUG FQb74bZK FQb75bEO FQb76bJ FQb77bRU FQb78bEU FQb69bJU FQb6 b O FQb6 b O FQb6 bEN ...

Page 20: ...QbLQSXWbYROWbV FQbLQSXWbYROWbU FQbLQSXWbYROWbU FQbLQSXWbYROWbU FQbLQSXWbYROWbU FQbDFbRXWbEN FQbDFbLQbEN FQbFRPPbRXWbEO FQbFRPPbLQbUG FQbIDQb48YbEN FQbGHEbZK FQbIODVKbUG FQbOJPYb O FQbUHDFWRUb5 FQbUHDFWRUb4 CN_INV_R CN_INV_S CN_INV_T CN1 CN_IN_R CN_IN_S CN_IN_T CN_IN_N ...

Page 21: ...Wiring Diagrams 21 Fan PCB FQbOJPYb O FQbIODVKbUG FQbMWDJbUG FQbLQYbEN FQbFRPPbRXWbZK FQbIDQ4bXYZbUG FQbIDQ5bXYZbUG FQbGFOLQNb O ...

Page 22: ...Exploded View 22 6 Exploded View 6 1 Fan Assembly The parts are applied to 2UNIT and 3UNIT 559010 546810 W4810B 149980 W4810A 435512 ...

Page 23: ...3 Exploded View 6 2 Condenser Assembly The parts are applied to 2UNIT and 3UNIT 352114A 552115B W4811E W4811I 552115A W4811F W4811G W4811B W4811H W4811C 352114B W4811D W4811J W4811A 554030B W4810C 554030A ...

Page 24: ...e Parts The parts are applied to 2UNIT The parts are applied to 3UNIT 135312 137213D 137213B W4811K 137213H 137213I W49810C 137213D 137213D W49810C 137213F 137213E 137213C W49810A 137213A 137213G W49810B Exploded View ...

Page 25: ...111B 55211GA 552114B The parts are applied to 2UNIT The parts are applied to 2UNIT and 3UNIT The parts are applied to 3UNIT 553000A 553000B Compressor2 Sump Heater Compressor1 Sump Heater Product name Location No Position Housing color Heater Sump 553000A Inverter Comp2 Blue Heater Sump 553000B Inverter Comp1 Yellow Clamp Spring W48602 H P Model ...

Page 26: ...y 165010A 1 Discharge Pipe High pressure White Sensor Assembly 165010B 1 Suction Pipe Low pressure Black Sensor Assembly 165010C 2 Discharge Pipe High pressure Red Sensor Assembly 165010D 2 Suction Pipe Low pressure Blue Coil 661400A 1 Hot gas White Coil 661400C 2 Hot gas Violet Coil 661400B 1 4Way Violet Solenoid 561410A 2 4Way Black Coil 661400D 1 SC EEV Blue Coil 661400E 2 SC EEV Gray Coil 6614...

Page 27: ...sembly NTC 263230A Water Pipe Inlet Outlet Blue Thermistor Assembly NTC 263230B Comp1 Discharge Liquid pipe Suction pipe Green Thermistor Assembly NTC 263230C Comp2 Discharge Liquid pipe Suction pipe Yellow Thermistor Assembly NTC 263230D Comp1 Hex SC Out SC In Violet Thermistor Assembly NTC 263230E Comp2 Hex SC Out SC In Black 1 Unit ...

Page 28: ...3230A Water Pipe Inlet Outlet Blue Thermistor Assembly NTC 263230B Comp1 Discharge Liquid pipe Suction pipe Green Thermistor Assembly NTC 263230C Comp2 Discharge Liquid pipe Suction pipe Yellow Thermistor Assembly NTC 263230D Comp1 Hex SC Out SC In Violet Thermistor Assembly NTC 263230E Comp2 Hex SC Out SC In Black 2 Unit ...

Page 29: ...y NTC 263230A Water Pipe Inlet Outlet Blue Thermistor Assembly NTC 263230B Comp1 Discharge Liquid pipe Suction pipe Green Thermistor Assembly NTC 263230C Comp2 Discharge Liquid pipe Suction pipe Yellow Thermistor Assembly NTC 263230D Comp1 Hex SC Out SC In Violet Thermistor Assembly NTC 263230E Comp2 Hex SC Out SC In Black 3 Unit ...

Page 30: ...61704 268711B W6200 247810A 268711D 268711E 346810 268711C 247810B Product name Location No Position Remarks PCB 268711A Main PCB PCB 268711B External PCB PCB 268711C Adapter PCB PCB 268711D Fan PCB PCB 268711E Inverter PCB Exploded View ...

Page 31: ...74249003 1 ABA74249003 2 ABA74249003 3 W4811E Bracket Assembly ABA74249004 1 ABA74249004 2 ABA74249004 3 W4811F Bracket Assembly ABA74088605 1 ABA74088605 2 ABA74088605 3 W4811G Bracket Assembly ABA74088606 1 ABA74088606 2 ABA74088606 3 W4811H Bracket Assembly ABA74088607 1 ABA74088607 2 ABA74088607 3 W4811I Bracket Assembly ABA74088608 1 ABA74088608 2 ABA74088608 3 W4811J Bracket Assembly ABA7434...

Page 32: ...BD63265701 2 EBD63265701 3 Low Pressure Sensor 165010C Sensor Assembly 6501A20004U 1 6501A20004U 2 6501A20004U 3 High Pressure Sensor 165010D Sensor Assembly EBD60661807 1 EBD60661807 2 EBD60661807 3 Low Pressure Sensor 266010 Switch Assembly Pressure EBF63614906 2 EBF63614906 4 EBF63614906 6 High Pressure Switch 552200 Valve Expansion Body MJX63992003 2 MJX63992003 4 MJX63992003 6 Sub Cooling EEV...

Page 33: ...63285705 2 EBG63285705 3 6 6 Control Box Parts 247810A Controller Assembly ACM75098802 1 ACM75098802 1 ACM75098802 1 Main Controller 247810B Controller Assembly ACM74918902 1 ACM74918902 1 ACM74918902 1 HMI 268711A PCB Assembly Main EBR85112901 1 EBR85112901 2 EBR85112901 3 CYCLE Main PCB 268711B PCB Assembly EBR81613002 1 EBR81613002 2 EBR81613002 3 External PCB 268711C PCB Assembly Power 6871A20...

Page 34: ...rror or discharge tempera ture error Motor insulation broken Strainer clogged Oil leakage Motor insulation failure R S T misconnection Motor failure bad ventilation around outdoor heat exchanger Coil failure EEV closed Check resistance between terminals and chassis Change strainer Check oil amount after opening oil port Check resistance between terminals and chassis Check compressor R S T connecti...

Page 35: ...be OFF 2 If output phase is different or continuously in the ON state motor will not operate smoothly and start vibrat ing EEV valve operation ø1 ON ON OFF OFF ø2 ON ON ON ON ø3 OFF OFF OFF ON ø4 OFF OFF OFF OFF Output ø No Output state 1 2 3 4 At power ON open angle signal of 2 000 pulses output and valve position is set to ⓐ If valve operates smoothly no noise and vibration occurs and if valve i...

Page 36: ...istance between the coils Red white red yellow red orange red blue using a tester It is normal if the resistance is within 52 Ω 3 Ω Based on 20 Please replace EEV coil Outdoor unit EEV Please measure the resistance between the coils Red white red orange brown yellow brown blue using a tester It is normal if the resistance is within 150 Ω 10 Replace EEV Incomplete connection of a connector or incom...

Page 37: ...g the body part the pipe can be banded due to the excess force applying on the pipe Therefore please hold the body part tightly to not to be moved n Coil installation method Please hold the bottom part of a body tightly to not to be moved and insert the coil from the top Please insert the fixed equipment of a coil to the groove of a body part correctly There are 4 grooves where the fixed equipment...

Page 38: ... Ω or Open hundreds MΩ the Inverter PCB needs to be replaced 6 In case that bridge diode is damaged check if the Inverter PCB needs be replaced Red and black are the measuring terminals of multi tester Internal circuit diagram Appearance R red 0 4 V 0 7 V S red 0 4 V 0 7 V T red 0 4 V 0 7 V R black 0 4 V 0 7 V S black 0 4 V 0 7 V T black 0 4 V 0 7 V Diode terminal terminal black terminal red Teste...

Page 39: ...value is different from the table set multi tester to resistance mode and measure If the value is short 0 Ω or Open hundreds MΩ Inverter PCB needs to be replaced 6 In case measured value is different from the table PCB needs to be replaced PCB damaged Red and black are the measuring terminals of multi tester P terminal black N terminal red U terminal red 0 2 0 6 V V terminal red 0 2 0 6 V W termin...

Page 40: ... part is damaged 5 If the measured value is different from below table Fan PCB needs to be replaced Red and black are the measuring terminals of multi tester P terminal black N terminal red U terminal red 4 98 MΩ 10 25 5 85 MΩ 10 25 V terminal red 4 98 MΩ 10 25 5 85 MΩ 10 25 W terminal red 4 98 MΩ 10 25 5 85 MΩ 10 25 P terminal red N terminal red U terminal black 4 49 MΩ 10 25 0 72 MΩ 10 25 V term...

Page 41: ...ver 1 kg cm2 the pressure sensor is out of order it need to be replaced 4 The composition of pressure sensor The pressure sensor is composed like the circuit picture shown above If DC 5 V voltage flows on red and black wire voltage would be made between the white and black wire The pressure which is equivalent to the pressure output is shown in the table above 1 The outdoor fan is controlled by th...

Page 42: ...ed on the valve insulation resistance shall be 100MΩ or more when it is measured with DC mega tester DC 500 V 1 It maintains OFF state until power is applied and the product is turned on 2 During the cooling operation defrost operation and oil recovery OFF during heating operation ON 3 If it is changed from cooling operation to heating operation it is activated for 3 minutes and converts 4Way valv...

Page 43: ...ent of an inverter power circuit The measured value can differ depending upon measurement equipment and a measurement circuit Especially an output voltage of an inverter has an pulse type pattern the output frequency is also changed Additionally the measured value greatly differs depending upon measurement equipment 1 When checking whether or not an output voltage of an inverter is consistent When...

Page 44: ...ion of polarity 5 Check short circuit and grounding Measure winding resistance of the motor coils 14 2 Ω 7 25 Replace the circuit board in following procedures if problems occur again when powering on and if there are no matters equivalent to items as specified in above 1 through 4 Carefully check both connector and grounding wires when replacing the circuit board 1 Replace only fan control boards...

Page 45: ...tion Model name JQC068MAA Compony LG Form Inverter scroll Compression volume cm3 rev 62 1 Refrigerating machine oil FVC68D PVE Weight 31 8 kg Internal diameter of suction inlet 22 6 mm Internal diameter of discharge outlet 16 05 mm Motor Number of poles 6 poles Insulation grade B Class Performance Based on 60Hz Cooling capacity W 24 911 Power consumption W 4 060 Operation current 12 6 Operation fr...

Page 46: ... a chiller controller is not performed for 30 seconds Product stop Automatic return to a normal condition CHxx005 Communication error with a cycle control box In case where the communication between a controller and a cycle control box is not performed for 30 seconds Product stop Automatic return to a normal condition CHxx009 Remote communication error After a communication of a remote control bus...

Page 47: ...ve IPM defect Inverter compressor defect Correspond cycle stop Automatic return to a normal condition CHxx022 Inverter compressor input over current Inverter compressor input over current occurrence Correspond cycle stop Automatic return to a normal condition CHxx023 Inverter compressor DC Link low voltage DC voltage charge defect Correspond cycle stop Automatic return to a normal condition CHxx02...

Page 48: ...h pressure side pressure excessive increase occurrence Correspond cycle stop Automatic return to a normal condition CHxx035 Compressor inlet pressure excessive decrease Low pressure side pressure excessive decrease occurrence Correspond cycle stop Automatic return to a normal condition CHxx036 Low pressure ratio error Low pressure ratio error occurrence Correspond cycle stop Automatic return to a ...

Page 49: ...is short open Stop applicable cycle Automatically return to normal condition CHxx045 Heat exchanger temperature sensor error Heat exchanger temperature sensor is short open Stop applicable cycle Automatically return to normal condition CHxx046 Suction temperature sensor error Suction temperature sensor is short open Stop applicable cycle Automatically return to normal condition CHxx050 Chiller 3 p...

Page 50: ...d a main board Communication defect occurrence with an inverter control part Correspond cycle stop Automatic return to a normal condition CHxx059 Installation Failure of Series Model Outdoor Unit Installation Failure of Series Model Outdoor Unit Stop applicable cycle Automatically return to normal condition CHxx060 Inverter PCB EEPROM error Inverter PCB EEPROM error Correspond cycle stop Automatic...

Page 51: ...Fan over voltage error Fan over voltage Stop applicable cycle Automatically return to normal condition CHxx079 Fan start failure error Fan start failure Stop applicable cycle Automatically return to normal condition CHxx086 CYCLE Main PCB EEPROM error Main PCB EEPROM access error Stop applicable cycle Automatically return to normal condition CHxx087 Fan PCB EEPROM error Fan PCB EEPROM access error...

Page 52: ...nsor error Control box inner temperature sensor is short open Stop applicable cycle Automatically return to normal condition CHxx104 Communication Error between Outdoor Unit Communication Error between Outdoor Unit Stop applicable cycle Automatically return to normal condition CHxx105 Fan board communication error Fan board communication error Stop applicable cycle Automatically return to normal c...

Page 53: ...d cycle stop Automatic return to a normal condition CHxx145 Main Board External Board communication Error Main Board External Board communication Error Stop applicable cycle Automatically return to normal condition CHxx150 Liquid Compression Prevention Error Liquid Compression Prevention Error Stop applicable cycle Automatically return to normal condition CHxx151 4 way valve switching error Mode s...

Page 54: ...erature Surge in fan board heat sink temperature Stop applicable cycle Automatically return to normal condition CHxx194 Fan board heat emitting plate temperature sensor error Fan board heat emitting plate temperature sensor is short open Stop applicable cycle Automatically return to normal condition The phenomena from main component failure ...

Page 55: ...ller board Sensor replacement Is the resistance value of a sensor normal Note 1 Chiller board replacement Yes No No Yes Note 1 An error is occurred in case of more than 100 kΩ Open or less than 100 Ω Short Reference A temperature sensor is normal if a resistance value changes depending upon the temperature and next resistance value is shown based on the current temperature 5 deviation Air temperat...

Page 56: ...r board properly performed Check confirmation by replacing HMI Is a communication error occurrence confirmation error occurred by replacing a chiller board Yes Yes Yes No No No Note 1 Insert a terminal paying attention to the communi cation polarity as a figure Note 2 Confirm an address by confirming below Chiller board setting Error code check Option Setting Press SW_COMF Button to move to O Leve...

Page 57: ...roblem Are a capacity setting of a chiller board and installed capacity of an outdoor unit agreed Is polarity of a communication line properly matched Is an address setting of outdoor unit PCB properly performed Is an error still occurred after replacing the chiller board Check after replacing outdoor unit PCB Yes Yes Yes Yes Yes No No No No No SW105 Note 2 Reset the DIP switch of SW01 Confirm a s...

Page 58: ... board No No Yes Yes No Yes No Yes Yes No Note 1 Confirm whether or not the power of remote auto matic control equipment communicating with a chiller board or DDC is normally supplied Note 2 Providing 485 communication is not communicated in case where polarity doesn t match Match providing connection map polarity A and B with the polarity of remote automatic control equipment or 485 com municatio...

Page 59: ... coming through UI6 G is in short sta tus using a tester In case where both ends are not in short status request to a person in charge of facility as a problem of a pump output Note 4 Confirm whether or not a pump interlock ON signal are occurred normally Note 3 Both ends short like a figure below After making a terminal UI6 G of a chiller board short Note 3 is a green signal occurred on a pump in...

Page 60: ...essing the reset button of HMI the error should be removed by pressing the reset button for sure in case of occurring a flow switch error Note 2 Please include the flow formation part in the product Note 4 Confirm whether or not a flow switch ON sig nal are occurred normally After making a terminal UI5 G of a chiller board short Note 3 is a green signal occurred on a flow switch input of HMI syste...

Page 61: ... there any power wire connections normal No Yes 1 Check R S T N Wiring Condition Rewire them if abnormality found Is Inverter PCB assembly normal No Check Inverter PCB assembly IPM normality Replace Inverter PCB assembly if abnormality found Is compressor Wire connection condition normal No 1 Check Inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 C...

Page 62: ...code check 62 Measuring resistance between each terminal of compressor IPM IGBT joining point Check joining condition R S T Check DC Link connector joining condition Compressor wire connector connection point ...

Page 63: ...on normal No Check connection between inverter PCB assembly and bridge diode misconnection disconnection wiring again if abnormality found Yes Is input voltage normal No Check R S S T T R phase voltage 380 415 V 10 R N S N T N phase voltage 220 10 Check connection condition and wiring if power is abnormal Yes Is inverter PCB assembly normal No Check inverter PCB assembly IPM normality Replace inve...

Page 64: ... 64 Measuring resistance between each terminal of compressor Compressor wire connector connection Measuring input voltage R L1 S L2 T L3 N Error code check ...

Page 65: ... T N phase voltage 220 10 Check connection condition and wiring if power is abnormal Are there any power wire connections normal No Yes 1 Check R S T wiring conditions Rewire them if abnormality found Is inverter PCB assembly normal No Check inverter PCB assembly IPM normality Replace inverter PCB assembly if abnormality found Is bridge diode connection normal No 1 Check bridge diode connection co...

Page 66: ...com pressor 24 241 Is high pressure switch connector connected to PCB No Note 1 Note 2 Note 2 Connect securely Is high pressure switch connector short during off time Yes No Is this error appeared again after reset Yes No Is SVC valve open Yes Re check momentary problem or not Replace connecting cable Open SVC valve No Yes Is high pressure switch terminal short No Replace high pressure switch Yes ...

Page 67: ... and installation condition Yes Are there any power wire connections normal No Yes 1 Check R S T wiring conditions Rewire them if abnormality found Is input voltage normal No Check R S S T T R phase voltage 380 415 V 10 R N S N T N phase voltage 220 10 Check connection condition and wiring if power is abnormal Is inverter PCB assembly power connection normal No Check connection between inverter PC...

Page 68: ...mpressor 2 Check insulation resistance between compressor terminal and pipe over 50 M Replace compressor if abnormality found Are the resistance Between each phase and insulation resistance of Inverter compressor normal No Yes No Yes 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 ...

Page 69: ... normal No Yes 1 Check resistance between each terminal of compressor 2 Check insulation resistance between compressor terminal and pipe over 50 M Replace compressor if abnormality found Is compressor Wire connection condition normal No Yes 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad c...

Page 70: ...s method Is the amount of refrigerant normal Refrigerant side Is there any evidence of a pipe leakage or cracks Refrigerant recharge after welding and re connecting the correspond part Correspond compressor discharge temperature sensor replacement Take action after checking other parts and operation environment EEV replacement Refrigerant amount correction Additional seal in Is the sensor resistan...

Page 71: ...s valve defect n Failure diagnosis method Are a communication line and a pipe connection normal Communication line Pipe correction Relevant parts check and replacement Check after replacing PCB High pressure sensor replacement Heat exchanger shielding removal Refrigerant amount correction Is the amount of refrigerant normal Refrigerant side Isn t a heat exchanger clogged EEV check PCB check Instal...

Page 72: ...gerant part Yes No Is fan normal in heating outdoor fan in cooling indoor fan Yes Adjust the amount of refrigerant Additive charge check communication piping correction Check and replace related parts Is strainer Ok No Replace the strainer No Replace the pressure sensor Yes Yes EEV check PCB check Installation environment check Yes Are the values of manifold and low pressure sensor same Is the low...

Page 73: ...w Chart Is input voltage normal No Yes Recheck power and installation condition Check R S S T T R phase voltage 380 415 V 10 R N S N T N phase voltage 220 10 Check connection condition and wiring if power is abnormal Is inverter PCB assembly normal No Yes Replace inverter PCB assembly Measuring input voltage Inverter PCB assembly 1 Check R S T wiring conditions 2 Check Noise filter wiring conditio...

Page 74: ...d to PCB Insert a sensor to PCB Sensor replacement Correspond outdoor unit PCB replacement Is a resistance value of a sensor normal Note 1 Correspond sensor replacement Are a MV phase temperature value and a sensor resistance value agreed No No No Yes Yes Yes Note 1 An error occurs in case of more than 5 MΩ Open or less than 2 kΩ Short Reference A discharge temperature sensor is normal if a resist...

Page 75: ...outdoor PCB 43 431 Sensor error of high pressure Abnormal value of sensor Open Short 1 Bad connection of high pressure connector 2 Defect of high pressure connector Open Short 3 Defect of outdoor PCB n Failure diagnosis method Is a sensor normally connected to PCB Insert a sensor to PCB Correspond pressure sensor replacement Is it normal after replacing PCB Terminated No Yes Yes Pressure sensor co...

Page 76: ...efect 2 Temperature sensor defect Open Short 3 PCB defect n Failure diagnosis method Is a sensor normally connected to PCB Insert a sensor to PCB Sensor replacement Is a resistance value of a sensor normal Note 1 Correspond PCB replacement No No Yes Yes Note 1 An error occurs in case of more than 100 kΩ Open or less than 100 Ω Short Reference A temperature sensor is normal if a resistance value ch...

Page 77: ...ower and installation condition Yes 1 Check resistance between each terminal of compressor 0 172 0 173 Ω 7 2 Check insulation resistance between compressor terminal and pipe over 50 M Replace compressor if abnormality found Are there any power wire connections normal No Yes 1 Check R S T N wiring conditions Rewire them if abnormality found Is inverter PCB assembly normal No Check inverter PCB asse...

Page 78: ...agnosis and countermeasure flow chart Is communication 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 communication cable connected correctly Yes No Re connect communication cable Is CYCLE Main PCB normal Yes No Replace CYCLE Main PCB Replace inverter compressor PCB The method of checking CYCLE Main ...

Page 79: ...eck if there is a problem in the communication line locking disconnection short circuit If a problem is found install again 2 Check if there is a welding in the middle connection part of the communication line If it is not welded perform welding replace communication cable Is the communication PCB locking status normal No 1 Check if there is a problem in the communication line locking disconnectio...

Page 80: ... inverter PCB assembly normal Is there any error when power reset Recheck power and installation condition 1 Check communication wiring conditions 2 Check connector conditions Rewire them if abnormality found 1 Replace Inverter PCB 1 Replace CYCLE Main PCB No No No Yes Yes Yes Communication LED Communication LED Communication LED Communication LED Fan board Inverter PCB 1 Inverter PCB 2 Main PCB I...

Page 81: ...PCB assembly damage n Error Diagnosis and Countermeasure Flow Chart Is EEPROM insertion normal No Yes Recheck power and installation condition 1 Check EEPROM insert direction connection condition 2 Check EEPROM Check SUM Replace if abnormality found Is inverter PCB assembly normal No Yes Replace inverter PCB assembly Inverter EEPROM inserting point Right inserting direction of inverter EEPROM Note...

Page 82: ...n status normal No Yes 1 Check pipe damage twist status 2 Check locking status outdoor unit indoor unit 3 Check whether EEV is correctly locked 4 Check refrigerant pressure 5 Check power wire locking status Are the inverter board and the heat radiation plate locked correctly No 1 Check inverter board screw locking status If a problem is found assemble again and take necessary actions Yes Is the he...

Page 83: ...ensor resistance value Open Short 1 Bad connection of low pressure connector 2 Defect of low pressure connector Open Short 3 Defect of outdoor PCB n Failure diagnosis method No No Yes Yes Is a sensor normally connected to PCB Insert a sensor to PCB Sensor replacement Is it normal after replacing PCB Main board replacement ...

Page 84: ...es Recheck power and installation condition Check ODU Fan Motor assemble condition and fan locking Reassemble or replace if abnormality found Is ODU Fan Motor normal No Yes 1 Check resistance between each phase U V W of fan motor terminal Panasonic Motor 9 5 Ω 5 25 LG Motor 8 6 Ω 7 25 2 Check insulation resistance between fan motor terminal U V W Replace fan motor if abnormality found Is wire conn...

Page 85: ...oard defect CT sensor detection part 4 Inverter board defect DC power part n Failure diagnosis method Is input voltage normal Is a fan board normal Power and installation environment recheck Is an error still occurred even if the power is reset Confirm input power 15 V wire connection status Re assembly and take action when finding a problem Fan board replacement Confirm whether or not a fan board...

Page 86: ...Power and installation environment recheck Confirm fan motor assembly status restriction Fan motor re assembly and replacement when finding a problem 1 Confirm resistance between motor output terminal U V W lines Panasonic motor 9 5 Ω 5 Based on 25 2 Insulation between a motor output terminal U V W and a pipe Resistance confirmation More than dozens MΩ Fan motor replacement when finding a problem ...

Page 87: ... Is fan PCB assembly normal Yes No Recheck power and installation condition Yes No 1 Check resistance between each motor output terminal 2 85 Ω 5 25 2 Check insulation resistance between ODU fan motor terminal U V W and pipe over 100 M Replace fan motor if abnormality found No Are the resistance Between each phase and insulation resistance of motor output terminal normal Check ODU fan motor assemb...

Page 88: ...EPROM 2 EEPROM wrong insertion n Failure diagnosis method Reset after checking EEPROM assemble condition Replace Correct EEPROM Yes No Yes No Is EEPROM assemble condition normal Correct check sum Recheck power and installation condition EEPROM Insertion Same direction both socket hole and EEPROM hole Note Replace after power off EEPROM ...

Page 89: ... Fan PCB EEPROM Error 87 871 n Error Diagnosis and Countermeasure Flow Chart Is EEPROM insertion normal 1 Check EEPROM insertion direction connection condition 2 Check EEPROM checksum Replace EEPROM if abnormality found Yes No Recheck power and installation condition Is Fan PCB assembly normal Yes No Replace fan PCB assembly Inverter EEPROM insertion direction Same direction both socket hole and E...

Page 90: ...nverter PCB and fan PCB 2 Check communication cable between Inverter PCB and fan PCB Reconnect or replace wire if abnormality found Check communication cable between Inverter PCB and fan PCB Reconnect or replace wire if abnormality found Yes No Yes No Is fan PCB communication LED yellow blinking normally Is inverter PCB communication LED yellow blinking normally Yes Is fan PCB assembly normal Rech...

Page 91: ...motor wire connection status normal Confirm a fan motor assembly status and restriction Outdoor fan motor re assembly and replacement when finding a proble 1 Confirm fan motor U V W connector connection status Wire re connection when finding a problem 2 Confirm a fan motor wire disconnection Replace an outdoor fan motor when finding a problem 1 Confirm a fan PCB connector connection status Re asse...

Page 92: ...inal contact defect Loose 5 3 Phase bridge diode damage by a fire n Failure diagnosis method Is the connection between an inverter board and a fan board normal Is DC_Link voltage normal Is a fan board normal Power and installation environment recheck 1 Confirm DC_Link wire connection 2 Confirm DC_Link disconnection Replace wire when occurring a problem DC_Link voltage measurement Check an inverter...

Page 93: ...e 115 11 115 Outdoor Unit Subcooling Outlet Temperature Sensor Error Abnormal sensor resis tance value Open Short 1 Defective temperature sensor connecter connection 2 Defective temperature sensor Open Short 3 Defective outdoor PCB n Error diagnosis and countermeasure flow chart Is temperature sensor connector connections are normal Is the value of temperature sensor resistance normal Check and co...

Page 94: ...efect n How to diagnose the disorder Is the external board Communication LED Yellow ON Connect the power cable again Connect communication cable again Yes Yes No No Is the communication cable correctly connected Replace the main board Yes No Is the main board normal Note 1 Replace the external board Note 1 How to check the normal status of the main board and the external board If it is normal comm...

Page 95: ... Replace outdoor unit PCB Yes Connect the connector again Replace 4way valve coil Yes No No Yes No Yes No Yes No Replace 4way valve Note 5 Is 4way valve connector correctly connected Is 4way valve coil resistance value normal Note 1 Is 4way valve coil correctly connected to the wary valve Note 2 Does master outdoor unit recognize the slave outdoor unit Note 3 Is 220V measured at PCB when heating s...

Page 96: ...see if 4way valve is normal 4way valve connector location in main PCB It is marked as CN16_VI CN25_BK Note 2 Check if the coil is fully inserted in 4way valve Normal value several kΩ Note 3 During the heating operation check if 220V is output from PCB ...

Page 97: ...atus normal Confirm fan motor assembly status and restriction Fan motor re assembly and replacement when finding a problem 1 Confirm fan motor U V W connector connection status Wire reconnection when finding a problem 2 Confirm a fan motor wire disconnection Outdoor fan motor replacement when finding a problem 1 Confirm a fan PCB connector connection status Re assembly and take action when finding...

Page 98: ...re is a leakage or not by injecting nitrogen gas 38kgf cm2 g through a check joint of low pressure and high pressure sides 10 Please degas the nitrogen gas 11 Please open a manifold gauge and then vacuum 12 Please install a crankcase heater 13 Please install a discharge temperature sensor of a compressor and its insulator 14 Please connect a power line by a compressor terminal 15 If finishing vacu...

Page 99: ...rection Is a signal normally permitted from PCB Are all the directions of 4way valve normal After the starting is there a difference between high pressure and low pressure When operating a compressor is current valve normal Compressor replacement Terminal reconnection or power supply direction replacement PCB replacement 4 way replacement Compressor replacement Restart No problem on a compressor N...

Page 100: ...normally supplied to outdoor EEV PCB replacement Check valve replacement Is a check valve normal When operating normally is there a temperature difference of the front and the rear of cooling EEV When operating normally is there a temperature difference of the front and the rear of heating EEV No problem on EEV EEV replacement Check start ...

Page 101: ...he front and the rear of over cooling EEV In case of EEV open after securing a discharge over heating temperature No problem EEV over cooling Check start Is PCB terminal connection normal Terminal reconnection PCB replacement Terminal reconnection PCB replacement Is a signal normally permitted from PCB EEV coil check and Sub cooling EEV replacement Is PCB terminal connection normal Is a signal nor...

Page 102: ...ressure and low pressure 4 atmosphere or more Solve the compressor problem Connect the connector again Replace PCB Check and replace 4way valve coil Start again There is no problem with 4way valve No After 3 minutes from the starting is the difference of high pressure and low pressure 4 atmosphere or more Does compressor operate normally Is PCB connector correctly connected ...

Page 103: ...rt Is a contact of IPM power part and signal part normal Fan IPM board replacement Fan motor replacement Is a fan moved when operating under 700 kPaG of heating low pressure Is a fan moved when operating exceed 2 700 kPaG of cooling high pressure No problem on an outdoor fan ...

Page 104: ...or replacement No problem on a temperature sensor 1 Confirm a connector position and connection direction 2 Confirm whether or not having a contact defect Check start After permitting power is voltage value on LGMV normal before operation Are a connector position and connection on Main Sub PCB normal Reconnection PCB confirmation and replacement Is 5V voltage output from PCB Pressure sensor replac...

Page 105: ...ressure switch is not operated Make a pressure switch short and then start an operation Is it normally operated No problem on a pressure switch PCB confirmation and replacement Pressure switch replacement CAUTION If operating as the pressure switch power is shut for a long time pipes and parts of the system can get severe damage ...

Page 106: ...ion all valves and EEV are open 1 Turn on Cycle Main PCB Dip S W No 4 2 Press SW02C button to check Suc in Segment window 1 2 3 4 5 6 7 8 3 Press SW01D button 1 time 4 Press SW02C button to check Se3 in Segment window 5 Press SW01D button 1 time 6 Vacuum mode setting is completed h It is cleared when you reset the power Dip S W Segment SW01D SW01C SW02C SW03C ...

Page 107: ...P NO MFL67288419 January 2018 ...

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