LG Multi V Water IV ARNU07GTU 2 Series Service Manual
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LG Multi V Water IV ARNU07GTU 2 Series Service Manual

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Internal Use Only
http://biz.lgservice.com
Outside Unit
R410A
SERVICE MANUAL
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.

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Summary of Contents for LG Multi V Water IV ARNU07GTU 2 Series

  • Page 1 Internal Use Only http://biz.lgservice.com Outside Unit R410A SERVICE MANUAL CAUTION Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel.

  • Page 2: Table Of Contents

    Part 2 Outside Units ....................15 Part 3 PCB Setting and Test Run ................38 Part 4 Trouble shooting guide................43 - 2 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Safety Precautions

    • There is risk of fire, electric shock, explosion, or • There is risk of fire, electric shock, explosion, or injury. injury. - 3 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 4 Should the refrigerant leak and cause the safety limit to be exceeded, harzards due to lack of oxygen in the room could result - 4 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 5 • To avoid vibration or water leakage. • If the gas leaks and accumulates around the unit, an explosion may result. - 5 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 6 • If the base collapses, the air conditioner could erate heat and cause a fire. fall with it, causing property damage, product failure, or personal injury. - 6 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 • Be careful and avoid personal injury. • There are sharp and moving parts that could cause personal injury. - 7 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 8: Part 1 General Information

    2.1 Indoor Unit .............11 2.2 Outside Unit............12 3. Combination of Outside Units........13 4. Nomenclature..............14 4.1 Indoor Unit .............14 4.2 Outside Unit............14 - 8 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Model Names

    ❈ *ART COOL- SE/S8( * R:Mirror, V:Silver), SF(* E:Red, V:Silver, G:Gold , 1: Kiss (Photo changeable)) *Wall Mounted- A: Basic, L:Plasma, *Ceiling Cassette- A: Basic, C:Plasma - 9 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: Outside Unit

    3 Ph, 380-415 V, 50 Hz 720LAS4 740LAS4 760LAS4 780LAS4 800LAS4 3 Ph, 380 V, 60 Hz Heat Pump ARWN - 10 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: External Appearance

    * A:Basic, C:Plasma ❈ In matters of combination with Outdoor unit system, refer the PDB of that outdoor units. - 11 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 12: Outside Unit

    ARWN440LAS4 ARWN460LAS4 ARWN480LAS4 ARWN500LAS4 ARWN520LAS4 ARWN540LAS4 ARWN560LAS4 ARWN580LAS4 ARWN600LAS4 ARWN620LAS4 ARWN640LAS4 ARWN660LAS4 ARWN680LAS4 ARWN700LAS4 ARWN720LAS4 ARWN740LAS4 ARWN760LAS4 ARWN780LAS4 ARWN800LAS4 - 12 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: Combination Of Outside Units

    ARWN440LAS4 ARWN460LAS4 ARWN480LAS4 ARWN500LAS4 ARWN520LAS4 ARWN540LAS4 ARWN560LAS4 ARWN580LAS4 ARWN600LAS4 ARWN620LAS4 ARWN640LAS4 ARWN660LAS4 ARWN680LAS4 ARWN700LAS4 ARWN720LAS4 ARWN740LAS4 ARWN760LAS4 ARWN780LAS4 ARWN800LAS4 - 13 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 14: Nomenclature

    Cooling Only or Heat Pump N: Inverter and H/P Indicates that this is Water System Outside Unit using the R410A - 14 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: Part 2 Outside Units

    Part 2 Outside Units - 15 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 4.8 Vacum mode ......................34 4.9 Forced oil return ......................35 4.10 Refrigerant noise reduction mode ................36 4.11 Cycle Data View .......................37 - 16 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 17: Basic Control

    Comp 1 Comp 1 Cooling and heating load Fuzzy Control Inverter linear control as cooling and heating load increasing - 17 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 18: Master And Slave Unit's Eev Control

    - Td ≤ 80℃ : VI_SH = 3℃ - 80℃<Td ≤ 90℃ : VI_SH = -2*Td/10 + 19 - 90℃<Td : VI_SH = 1℃ - 18 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 19: Special Control

    ■ Starting condition : When low oil level which is measured by oil level sensor is kept continuously then oil return operation will be start. ■ Oil return process ends if compressor protection control starts - 19 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 ■ Oil return operation time : 3 min for running step ■ Starting condition:same as cooling mode ■ Oil return process ends if compressor protection control starts - 20 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 21: Stop Operation

    When oil level which is measured by oil level sensor is kept differently between each compressor then oil equalizing EEV will be open during 5 minutes. - 21 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 22: Protection Control

    ≥ 190 kPa Normal control ❈ Frequency holding : frequency (or RPM) is not increasing ( can decrease ). - 22 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 23: Discharge Temperature Control

    41A or more ❈ AC input current is input current of inverter compressor except constant current (current pass through noise filter) - 23 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 24: Phase Detection

    - The state of pressure sensing switch is normally on. It has small electric current from 220V AC. Never touch the connecting terminal with hand nor short two wires directly. - 24 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 25: Other Control

    Total capacity including sub units is displayed (2sec) Heat pump : Display 2 is default value Power type Model type - 25 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 Every indoor unit displays its address on wired remote controller and the 7 segment of main PCB is off. - 26 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 * Functions save in EEPROM will be kept continuously, though the system power was reset. - 27 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 28: Cool & Heat Selector

    • If do not use a function, set an off-mode. • If use a function, first install a Cool & Heat selector. - 28 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 29: Geothermal Mode

    Anti freeze type CAUTION • Ask an authorized technician to setting a function. • Anti freeze is essential for geothermal mode. - 29 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 30: 220 V Out For Solenoid Valve

    • Ask an authorized technician to setting a function. • If do not use a function, set an off mode. - 30 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 31: Variable Water Flow Control

    • Ask an authorized technician to setting a function. • If do not use a function, set an off mode. - 31 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 32: Outside Unit Adress

    • If do not use a function, set an off mode. • It is recommended using a sump heater when ambient temperature of outside unit is below 0℃. - 32 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 33: Using A Sump Heater

    “oN”~“oFF” Push the ‘●’ button Using a sump heater CAUTION • Ask an authorized technician to setting a function. - 33 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 34: Vacum Mode

    Push the reset button on Master unit PCB CAUTION • ODU operation stops during vacuum mode. Compressor can't operate. - 34 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 35: Forced Oil Return

    Starting oil return with display “OI” · Auto reset after oil return completed. CAUTION • Ask an authorized technician to setting a function. - 35 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 36: Refrigerant Noise Reduction Mode

    Normal mode (Fast cooling & Fast heating) : Off Save the selected option value in EEROM CAUTION • Ask an authorized technician to setting a function. - 36 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 37: Cycle Data View

    1 PLS5 1350 op24 vi eev 2 PLS6 op25 IDU running capacity IDU1 op26 Total number of IDU IDU2 - 37 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 38: Part 3 Pcb Setting And Test Run

    Part 3 PCB Setting and Test Run - 38 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 39 • In case that the outdoor temperature is low, be sure to supply power 4 hours before operation so that the heater is heated(insufficient heating may cause damage of the compressor.) - 39 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 40 • When CH05/53/11 ERROR occurs, check if auto-addressing has done and communication wiring is ok. - 40 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 41 7 - Segment SW04C (X : cancel) SW03C ( : forward) SW02C ( : backward) SW01C ( : confirm) SW01D (reset) - 41 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 42 • Master Unit • Slave Unit Dip switch setting Dip switch setting ODU Setting Slave 1 Slave 2 Slave 3 - 42 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 43: Part 4 Trouble Shooting Guide

    Part 4 Trouble shooting guide - 43 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 44 2.6 Outdoor Fan .....................52 2.7 Solenoid Valve ..................53 2.8 Reverse Valve...................54 2.9 Temperature Sensor ................54 2.10 Others .....................55 3. Self-diagnosis function ..............56 - 44 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 45: The Phenomena From Main Component Failure

    • When CH05/53/11 ERROR occurs, check if auto-addressing has done and communication wiring is ok. - 45 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 46: Checking Method For Key Components

    (when measuring absolute values). Accurate measuring values cannot be obtained with a gen- eral movable tester (For analog and digital mode). - 46 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 47: Electronic Expansion Valve

    Full open EEV noise. open 1950 pulses - If liquid refrigerant is in EEV, the noise is lower. pulse - 47 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 48 - When the coil part is removed or assembled, be careful not to bend the pipe of the body. Body Body - 48 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 49 If estimated temperature is very low in comparison with suction temperature which is displayed at remote controller then the valve is not fully closed - 49 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 50: Phase Bridge Diode Checking Method

    Otherwise, there is chance of getting electric shock. • There is chance of electric shock by charged voltage. - 50 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 51: Inverter Ipm/Igbt Checking Method

    3.0K Ω ± 10%(25℃) 2.3K Ω ± 10%(25℃) ✽ Red(+) and black(-) are the measuring terminals of multi tester. - 51 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 52: Pressure Sensor(High/Low Pressure Sensor)

    This does not mean breakdown of the unit, the fan will start operating if it reaches the set point. - 52 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 53: Solenoid Valve

    5. Insulation resistance in the state of connecting the valve to coil should be over 100mΩ when measure it with DC mega tester(DC 500V). - 53 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 54: Reverse Valve

    2. Check whether the connector contact of temperature sensor is normal. 3. Measure the resistance of temperature sensor. 10KΩ±1%(25℃) 5KΩ±1%(25℃) 200KΩ±1%(25℃) Resistance 1.07KΩ±3.3%(85℃) 535Ω±3.3%(85℃) 28KΩ±7.7%(85℃) - 54 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 55: Others

    3) Set the multi meter to resistance mode, confirm that the resistance value of the resistor is around 270 kOhm Check and replace inferior components - 55 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 56: Self-Diagnosis Function

    Slave2 outside Unit Inverter Board Input Over Current(RMS) of Slave3 Outside Unit Inverter Board Input Current excess (RMS) Slave3 outside Unit - 56 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 Slave3 outside unit inverter DC link over- Compressor turned Off due to Slave3 outside unit inverter DC voltage error voltage over-charge - 57 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 58 Slave3 Outside Unit Low Compression Ratio Slave3 Outside Unit stayed under low Compression limit for 3 Limited minutes - 58 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 59 Slave2 Outside Unit High Pressure Sensor open or short Fault Slave3 Outdoor Unit High Pressure Sensor Slave3 Outside Unit High Pressure Sensor open or short Fault - 59 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 60 When the indoor unit control signal is not received from the 5 3 1 unit controller and indoor unit master Outside unit controller - 60 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 61 Slave2 Outdoor Unit PFC CT Sensor open or short Unit PFC CT Sensor Error of Slave3 Outdoor Slave3 Outdoor Unit PFC CT Sensor open or short Unit - 61 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 62 Slave3 Outdoor Unit Subcooling Outlet Slave3 Outdoor Unit Subcooling Outlet Temperature Sensor Temperature Sensor Error open or short - 62 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 63 Communication error between main MICOM and sub MICOM Communication error between MICOMs Communication error between main MICOM and sub MICOM - 63 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 64 CN-PIPE IN : Pipe inlet temp sensor CN-PIPE OUT : Pipe outlet temp sensor Measure the resistance of outlet pipe temp sensor. - 64 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 65 ❇ The PCB can differ from model to model. Check from the right source. Checking communication cable connection status - 65 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 66 * If the float goes up higher than a half of float switch then the circuit is open & the unit is stopped automatically. (High position Open) float Condensate water - 66 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 67 (Check input of 220V) (Marked as CN-DPUMP) Float switch Housing (CN-FLOAT) [***] Standard of drain pipe head height / slope MAX 450 - 67 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 68 (-9V~+9V) then of communication terminal between IDU and ODU communication from outdoor unit is normal - 68 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 69 - Replace the indoor unit PCB, and then make sure to perform Auto addressing and input the address of central control - 69 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 70 (Notice: The connection of motor connector to PCB should be done under no power supplying to PCB) - 70 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 71 After ODU main PCB Replace indoor unit 485 After Auto addressing, reset, error code transmission PCB error code disappears? disappears? - 71 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 72 Check Comp PCB assembly IPM normality. Is Comp PCB assembly → Replace Comp PCB assembly normal? if abnormality found. Recheck power and installation condition - 72 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 73 * Compressor wire connector connection each terminal of compressor point * IPM joining point Check joining conditon Check DC_Link Connector joining condition - 73 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 74 Check Comp PCB assembly IPM normality Is Comp PCB assembly → Replace Comp PCB assembly normal? Recheck power and installation condition - 74 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 75 * Measuring input voltage each terminal of compressor * Compressor wire connector connection * Check DC_Link Connector joining condition - 75 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 76 Check Comp PCB assembly IPM normality. Is Comp PCB assembly → Replace Comp PCB assembly if abnormality found. normal? Recheck power and installation condition - 76 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 77 Troubleshooting Guide * Check DC_Link Connector joining condition N terminal P terminal DC_Link Connector * Measuring input voltage - 77 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 78 LGMV similar as Replace high pressure sensor at manifold gauge? Check pipe is blocked or not and take measure - 78 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 79 → Reassemble if abnormality found Replace Comp PCB assembly. Comp PCB LED display error Recheck power and installation condition - 79 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 80 Check Comp PCB assembly IPM normality Is Comp PCB assembly normal? → Replace Comp PCB assembly Recheck power and installation condition - 80 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 81 Troubleshooting Guide * Measuring resistance between each terminal of compressor * Compressor wire connection - 81 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 82 * Measuring input voltage * Noise filter wiring CN_INV_T CN_INV_S CN_INV_R CN1_SMPS_POWER CN_INV_N CN_DCLINK_P CN_EXT_POWER CN_INV_R CN_INV_S CN_INV_T CN_INV_N - 82 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 83 Check Comp PCB assembly IPM normality Is Comp PCB assembly normal? → Replace Comp PCB assembly Recheck power and installation condition - 83 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 84 Troubleshooting Guide * Measuring resistance between each terminal of compressor * Measuring input voltage * Compressor wire connection - 84 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 85 Air temperature sensor: 10°C = 20.7kΩ : 25°C = 10kΩ : 50°C= 3.4kΩ Pipe temperature sensor: 10°C = 10kΩ : 25°C = 5kΩ : 50°C= 1.8kΩ - 85 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 86 PCB normal? Is the oil sensor Check and correct connection connection on comp normal? Replace oil sensor - 86 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 87 External Communication LED External Communication Connector Communication Connector & Communication Connector & LED in Main PCB LED in External PCB - 87 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 88 If the same error is occurred in mode, is the same error near future replace 4way valve occurred again? Replace 4 way valve***** - 88 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 89 ➃ If there is a unit in which the difference is not increased then the 4way valve of that unit is defective - 89 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 90 Air temperature sensor: 10°C = 20.7kΩ : 25°C = 10kΩ : 50°C= 3.4kΩ Pipe temperature sensor: 10°C = 10kΩ : 25°C = 5kΩ : 50°C= 1.8kΩ - 90 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 91 Air temperature sensor: 10°C = 20.7kΩ : 25°C = 10kΩ : 50°C= 3.4kΩ Pipe temperature sensor: 10°C = 10kΩ : 25°C = 5kΩ : 50°C= 1.8kΩ - 91 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 92 ■ Error diagnosis and countermeasure flow chart Communication Between Push the RESET Replay On-boarding Replace External PCB Main-Sub Micom button LED (Yellow) Blinking - 92 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 93 LED (Yellow) Blinking Press the Rest Button Replay Replace External PCB On-boarding Reset Button Communication LED Between Main and Sub Micom - 93 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 94 1. Set the slave mode with Simple central controller after reset. controller setting normal? Recheck power and installation condition <RS-485 communication wire miss connection> - 94 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 95 November, 2013 P/NO : MFL67103704...

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