LG General Wall Mounted-Inverter Type Svc Manual
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LG General Wall Mounted-Inverter Type Svc Manual

LG General Wall Mounted-Inverter Type Svc Manual

General wall mounted-inverter type
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Room Air Conditioner

SVC MANUAL(General)
MODEL : General Wall Mounted-Inverter Type
CAUTION
Before Servicing the unit, read the safety precautions in this SVC manual.
Only for authorized service personnel.

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Summary of Contents for LG General Wall Mounted-Inverter Type

  • Page 1: Room Air Conditioner

    Room Air Conditioner SVC MANUAL(General) MODEL : General Wall Mounted-Inverter Type CAUTION Before Servicing the unit, read the safety precautions in this SVC manual. Only for authorized service personnel.

  • Page 2: Table Of Contents

    Air Conditioner Service Manual CONTENTS Part 1 General Information 1. Safety Precautions...4 2. Nomenclature ...7 Part 2 Functions & Controls 1. List of Functions & Controls...9 2. Basic Mode Controls ...10 3. Special Mode Controls ...12 4. Utility Functions ...13 5.

  • Page 3: Part 1 General Information

    Part 1 General Information 1. Safety Precautions ...4 2. Nomenclature...7 Service Manual 3...

  • Page 4: Safety Precautions

    If discharge is not executed, an electric shock is caused by high voltage resulting in a death or injury. Do not turn the air-conditioner ON or OFF by plugging or unplugging the power plug. There is risk of fire or electrical shock. 4 Room Air Conditioner...
  • Page 5 Otherwise there is risk of electric shock or fire. Do not turn on the breaker when the front panel and cabinet are removed. Be sure to ground the air conditioner with an earthing conductor connected to the earthing terminal.
  • Page 6 (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 may enter the room and wet floor. 6 Room Air Conditioner...

  • Page 7: Nomenclature

    NBF F+(A/changeove)+A/clean NBF F+(A/changeove)+A/clean+4way NBF F+(A/changeove)+A/clean+PTC NBF F+(A/changeove)+Autoclean+4way+PTC NBF F+(A/changeove)+A/clean+4way+Low A+PTC Negative ion+A/Clean (Nano)Plasma+Negative ion+A/Clean 4way+(Nano)Plasma F+Negative ion+A/Clean Nano Plasma F+4Way+(A/changeove)+A/clean+Oxygen generator 4way+(Nano)Plasma F+Negative ion+A/Clean+Oxygen generator Dry contact Basic + Low A LG Model Development Serial No. Service Manual 7...

  • Page 8: Part 2 Functions & Controls

    Part 2 Functions & Controls 1. List of Controls & Functions ...9 2. Basic Mode Controls...10 3. Special Mode Controls...12 4. Utility Functions ...13 5. Protection Functions & Controls ...16 8 Room Air Conditioner...

  • Page 9: List Of Functions & Controls

    1. List of Functions & Controls Category Function Cooling Mode Heating Mode Basic mode Healthy Dehumidification controls Automatic operation Auto Changeover Jet Cool Special Mode Jet Heat controls Energy saving Forced operation Auto Clean Air volume control Natural Air control Utility Functions Chaos Swing Sleep mode Auto control...

  • Page 10: Basic Mode Controls

    • While in defrost control, the indoor and outdoor fans are turned off. • Compressor 2minutes delay - After compressor off, the compressor can restart minimum 2 minutes later. • T1 and T2 may be changed by models 10 Room Air Conditioner Comp. OFF Comp. OFF High...

  • Page 11: Healthy Dehumidification Operation

    • The air conditioner changes the operation mode automatically to keep indoor temperature steady. • When room temperature vary over ±2°C(±4°F) with respect to setting temperature, air conditioner keeps the room tem- perature in ±2°C(±4°F) with respect to setting temperature by changing the mode from cooling to heating and vice versa.

  • Page 12: Special Mode Controls

    • During cooling and dehumidification mode of operation, the Energy saving button can be input. • In this operation, before we feel cold the set temperature and air volume is set automatically to save energy. • The operation time and the other thing was decided by experiment. 12 Room Air Conditioner...

  • Page 13: Utility Functions

    4. Utility Functions 4.1 Forced operation • To operate the appliance manually in case when the remote control is lost, the forced operation selection switch is on the main unit of the appliance, and operate the appliance in the standard conditions. •...
  • Page 14 Start Mode 6 Mode 5 Mode 4 Mode 3 Mode 2 8¡ Mode 1 OPEN NOTE: Some Models are different by swing width and swing pattern. 14 Room Air Conditioner CLOSED 110° Mode8 Mode7 Mode6 Mode5 Mode4 Start Mode3 Mode2...

  • Page 15: Auto Restart

    4.6 Sleep mode Auto control • When the set sleep time is reached set time of [1,2,3,4,5,6,7hour] input by the remote control during the operation, the operation of the appliance stops. • When the appliance is on pause, the sleep timer mode cannot be input. 4.6.1 Sleep timer operation for cooling cycle •...

  • Page 16: Protection Functions & Controls

    • When indoor pipe temp. is 7°C(44.6°F) or higher after 2 min pause of compressor ➔ compressor, outdoor fan is turned on according to the condition of the room temperature. 6˚C(42.8˚F) 3˚C(37.4˚F) NOTE: Some Models are different by T1. 16 Room Air Conditioner Comp. free Comp. Step 4 Comp. Step 2 Comp. off T1: 0 ~ 2°C(32~35.6°F)

  • Page 17: Automatic Defrost

    5.5 Automatic defrost 5.5.1 9,12kBtu/h Model • While in heating mode operation in order to protect the evaporator pipe of the outdoor unit from freezing, reversed to cooling cycle to defrost the evaporator pipe of the outdoor unit. • Defrosting control is available 40 minutes later since heating cycle started and the difference of the pipe tem- perature of outdoor unit reaches above option 1.
  • Page 18 Piping temperature of the outdoor heat exchanger maintain below defrost starting temperature for 4 minutes after 35 minutes continuous operation. d)In case of passing 10 minutes after oil recovery operation 2) Outdoor piping temperature is below than –6°C (21.2°F, Option) for starting defrosting operation. 18 Room Air Conditioner...
  • Page 19 • Defrosting Control Algorithm 1) Lowering the compressor frequency when starts the defrosting operation. Constant speed compressor is ON after 10 seconds from the arrival time of 30 Hz (Option) frequency and is speed up its revolution till 100 Hz (Option) 2) Every EEV have 350 pulse (Option) of opening when starts defrosting operation.
  • Page 20 2. The single phase power DC is converted into a three phase chopped DC voltage with a variable frequency. 3. When the frequency changes, the rotation speed of the compressor changes resulting in an changed refrigerant circu- lation. This leads to changeable amount of the heat exchange per unit. 20 Room Air Conditioner 3Ø Comp.
  • Page 21 5.8 Overheating Protection (Power Module) 5.8.1 9,12kBtu/h Model • If the temperature of the heat sink thermistor. reaches over Toff, the Compressor stop instantly. • The compressor operating frequency is limited according to the heat sink thermistor. (refer to below FIG.) •...
  • Page 22 If the temperature reached Toff condition system will count 5 times after that and system will stop with error code. Toff=85°C(185°F) T2=75°C(167°F) T1=70°C(158°F) COMP frequency 22 Room Air Conditioner : No limitation on compressor frequency : Compressor will be off. Heat Sink temp 5 Hz 5 Hz frequency...
  • Page 23 5.9 Total Current Control (Over Current Protection) 5.9.1 9,12kBtu/h Model 1) CT1 control • If the operating current reaches I1, the operating frequency of the compressor decreases. • After decreasing the operating frequency by 1step, if operating current is below I1 for 60 seconds continuously, the operating frequency of compressor increases by 1step.
  • Page 24 If CT2 occurs 5 times in 1 hour,stop the operation and shows Error Code 22 Model Cooling (kBtu/h) (CT 1) 18~30 24 Room Air Conditioner „ 1 for more than 5 sec. then step down 1 more step. Heating CT 2 (CT 1)
  • Page 25 5.10 DC Peak control 5.10.1 DC Peak Current Error by a fault signal of IPM • If the operating current of IPM reaches 35A • If DC PEAK occurs 5 times within 1 hour, the appliance turns off and displays Error Code 6(9,12kBtu/h Model) / Error Code 21(18,24,30kBtu/h Model).
  • Page 26 System will stop if this situation occurs 5 times in 1 hour and error code will be generated. Toff(105)°C(221°F) T2(95)°C(203)°F T1(90)°C(194)°F COMP Expansion valve 26 Room Air Conditioner D-Pipe temp 5 Hz 5 Hz Down Down Pulse Up Pulse Up...
  • Page 27 5.11.3 Constant Compressor (only 30kBtu/h Model) 1) There can be two situations (a) Sensor is failed (Error Code 41) (b) Abnormal high temperature discharge temperature (error code for high discharge will be generated) Both cases unit will stop. 2) Compressor working (a) If discharge pipe temperature <...

  • Page 28: Low Ambient Control

    ❈ After the system is stopped by CT cut or heat sink cut-off then the cycle returns to the normal condtiond control. (T2 = 0)°C (T1 = 0)°C O/D fan 28 Room Air Conditioner 25(77°F) Comp Freq. Cond . temp.
  • Page 29 5.13 Oil return control(30kBtu/h Model) 5.13.1 Operating Contion 1) When the continuous running time is over 3hr.(option), oil returning operation is made for 3min. In case of the initial operation, oil returning operation is made, after completing initial operation. 2) After defrost and oil returning operation, the continuous running time is resetted. 5.13.2 Operation Process 1) EEV-Full open, Hot gas bypass valve-On 2) Compressor Step-70Hz + Constant Comp.

  • Page 30: Part 3 Test Run

    Part 3 Test Run 1. Check before Test Run...31 2. Test Run Flow chart ...32 3. Test Run Detail...33 30 Room Air Conditioner...

  • Page 31: Check Before Test Run

    1. Check before Test Run Check to see whether there is any refrigerant leakage, and check whether the power or transmission cable is connected properly. Check whether the liquid pipe and gas pipe valves are fully opened. NOTE: Be sure to tighten caps. Confirm that 500 V megger shows 2.0 MΩ...

  • Page 32: Test Run Flow Chart

    Is hot air discharged ? After Hot Start Normal NOTE: When outdoor temperature is low,the unit is operated to Heating mode 32 Room Air Conditioner Refer to part4, 7 Electric part Refer to part4, 5 Cycle part * Check the load (In/Out Temp.)

  • Page 33: Test Run Detail

    R410A 35°C (95°F) 8.5~9.5kg/cm NOTE: If the actual pressure is higher than shown, the The air conditioner is now ready for use. PUMP DOWN This is performed when the unit is to be relocated or the refrigerant circuit is serviced.
  • Page 34 1. 2-Way, 3-Way Valve ...35 2. Pumping Down ...36 3. Evacuation (All amount of refrigerant leaked) ...37 4. Gas Charging (After Evacuation) ...38 5. Self-diagnosis Function...39 6. Cycle Troubleshooting Guide...42 7. Electronic Parts Troubleshooting Guide ...44 34 Room Air Conditioner...

  • Page 35: Way, 3-Way Valve

    1. 2-Way, 3-Way Valve Flare nut piping connection Works Shipping Air purging (Installation) Operation Pumping down (Transfering) Evacuation (Servicing) Gas charging (Servicing) Pressure check (Servicing) Gas releasing (Servicing) 2-way Valve (Liquid Side) Hexagonal wrench (4mm) Open position Closed position To outdoor unit Shaft position Closed (with valve cap)

  • Page 36: Pumping Down

    Gas side Closed 3-Way valve CLOSE (6) Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 1kg/cm (7) Immediately set the 3-way valve to the closed position. – Do this quickly so that the gauge ends up indi-...

  • Page 37: Evacuation (All Amount Of Refrigerant Leaked)

    3. Evacuation (All amount of refrigerant leaked) Indoor unit Vacuum pump OPEN • Procedure (1) Connect the vacuum pump to the center hose of charge set center hose (2) Evacuation for approximately one hour. – Confirm that the gauge needle has moved toward 0.8 Torr.

  • Page 38: Gas Charging (After Evacuation)

    (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).

  • Page 39: Cycle Troubleshooting Guide

    5. Cycle Troubleshooting Guide Trouble analysis 1. Check temperature difference between intake and discharge air, and operating current. Temp. difference Current Temp. Difference Temp. difference Current Operating Current Temp. difference Current Temp. difference NOTICE Temperature difference between intake and discharge air depends on room air humidity. When the room air humidity is relatively higher, temperature difference is smaller.
  • Page 40 1. The suction pressure is usually 8.5~9.5 kg/cm 2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty. 40 Room Air Conditioner Cause of Trouble Defective compressor Excessive amount of...

  • Page 41: Electric Parts Troubleshooting Guide

    6. Electronic Parts Troubleshooting Guide The Product doesn’t operate at all. (9~30kBtu/h Model) Trouble 1 Turn off the main power and wait until LED on outdoor PCB is off. Does "Beeping" sound is made from the indoor unit? Does "Lighting" LED is mounted on the outdoor PCB? Check the voltage of power(AC 208~230V, 60Hz).

  • Page 42: Part 4 Trouble Shooting

    Check the contact of CN-DISP 1, 2 connector screen, replace battery. Check DISP P.C.B Ass'y -Voltage between CN-DISP1 : DC +5V Check point • Check the connecting circuit between MICOM PIN and CN-DISP1 PIN • Check receiver ass'y 42 Room Air Conditioner...
  • Page 43 The Compressor/Outdoor Fan don't operate (9~30kBtu/h Model) Trouble 3 Operate Cooling Mode by setting the disired temperature of the remote controller is less than one of the Indoor temperature by 1°C at least. When in air circulation mode, compressor/outdoor fan is stopped. Check the sensor for Indoor temperature is attatched as close as to be effected by the themperature of Heat Exchange (EVA.) When displaying Error code, refer to the trouble shooting guide.
  • Page 44 Check that CN_FAN(A,B) supplied voltage to outdoor PCB is about AC 208V~230V. Check the electrical wiring diagram of Outdoor side. Check the open or short of connecting wires between Indoor and Outdoor. 44 Room Air Conditioner Turn on the main power. Turn off main power.
  • Page 45 When indoor Fan does not operate.(9~30kBtu/h Model) Trouble 5 Check the related circuit of indoor Fan Motor. • The pin No. of micom and the part for driving SSR.(Q01M) • Check 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.

  • Page 46: Self-Diagnosis Function

    4 times 3 sec 5times 3 sec 6times 3 sec 7times 3 sec 8times 46 Room Air Conditioner Cause of Error 1time 1time • Indoor Temp. sensor error - Sensor open or short 3 sec 2 times 2 times • Outdoor Temp. sensor error...
  • Page 47 I 18,24,30kBtu/h Model Indoor Error Error code Descrition No Error Indoor Room themistor error Indoor in-piping sensor error Remote controler error Drain Pump error Communcation error between in and out Indoor Out-Piping sensor error Diffrent mode operation Outdoor Error Ex) Error Code 21 (IPM Fault) 2 Times 2 Times LED01G...
  • Page 48 D-pipe sensor Cons. (open/ short) Over capacity Communication (Indoor EEPROM check sum Cond. Pipe sensor temp. high Heat sink sensor temp. high Heat sink sensor (open/ short) 48 Room Air Conditioner LED02G LED01G (Green) (Red) 4 times 4 times 1 time...
  • Page 49 I Troubleshooting Guide(9,12kBtu/h Model) Error code Description Indoor TH. is short or open Check flow Indoor TH. is connected to Indoor pcb assembly ? - Connect to CN-TH1 in indoor pcb assembly Error code Description Outdoor TH. is short or open Check flow Outdoor TH.
  • Page 50 PCB assembly? - Connect to CN-TH2 in outdoor PCB assembly 50 Room Air Conditioner • Heat-sink TH. is damaged(short or open). • Heat-sink Temp. is over 95°C(203°F) • Damage or defect on the sensing circuit of outdoor pcb assembly.
  • Page 51 • Defect of communication components in indoor pcb assembly • Defect of communication components in outdoor pcb assembly • Defect of power supply components in outdoor pcb assembly • No ground connection in air conditioner unit (affected by noise in power source) in outdoor about...
  • Page 52 (Comp.motor coil error) ¡ normal : 1 ~2Ω Between U,V,W and Body ¡ normal : over 10MΩ 52 Room Air Conditioner • Supplied power is not normal • Comp Connector (CN-U,V,W) is disconnected or inserted to wrong position • Compressor is damaged (coil short) ➔ replace compressor •...
  • Page 53 Error code Description Over current Error (CT2) Check flow Supplied voltage to Outdoor pcb is about AC 208~230V ? Check power source Current sensing circuit is right ? Check current sensing circuit. - check CT is damaged in outdoor pcb (output wire is disconnected to pin or not) - BD01N is inserted in right position (refer marking on pcb and component)
  • Page 54 Outdoor fan is rotating ? (1) Check outdoor unit - remove obstacles in outdoor unit 54 Room Air Conditioner • Indoor fan is locked or separated • Fan connector is not connected to indoor pcb assembly • Defective in DC-fan driving circuit...
  • Page 55 Error code Description D-Pipe TH. is short or open Check flow D_PIPE TH. is connected to Outdoor pcb assembly ? Connect to CN-D_PIPE in outdoor pcb assembly • D_pipe TH. is short or open • D_pipe TH. is not connected to the outdoor pcb assembly •...
  • Page 56 7. If the voltage of the sensor is 2.5VDC at 25°C(77°F), then sensor is normal. 8. If the resistance of the sensor is 0 or 5VDC, then sensor is abnormal. ¡ Repair or Change the PCB. 56 Room Air Conditioner Cause of error •...

  • Page 57: Troubleshooting Ch05, Ch53

    2) Troubleshooting CH05, CH53 Error Title code Communication (Indoor ¡ Outdoor) Cause of error • Power input AC 208~230V. (Outdoor, Indoor) • The connector for transmission is disconnected. • The connecting wires are misconnected. • Communication poorly • The GND1,2 is not connected at main GND. •...
  • Page 58 4. Check the resistance of compressor. ¡ Normal : 0.65Ω(INV), 0.8Ω(Cons.) ¡ No difference at each terminal. 5. Check the insulation from water at IPM part. ¡ Check the trace of water. 6. Check the IPM circuit. 58 Room Air Conditioner Cause of error • An instant over current in the U,V,W phase - Comp lock •...
  • Page 59 4) Troubleshooting CH21, CH22 Error Title code Max. C/T Internal circuit Check Point 1. Check the power source. 2. Check the fan operation is right. 3. Check the current. 4. Check the install condition. 5. Check the internal circuit. (C/T, Diode, Resistor) Cause of error Malfunction of compressor Blocking of pipe...
  • Page 60 Error Title code DC Link Low voltage. DC Link High voltage 60 Room Air Conditioner Cause of error • Check the power source. • DC link volt. is • Check the components. 140VDC . • DC link volt. is • Check the power source.
  • Page 61 6) Troubleshooting CH24, CH25 Error Title code Press S/W Open Input voltage TRANS1 50Hz, DC12V Check Point • CH 24 1. Check the connection of “CN_PRESS” 2. Check the install condition for over load. 3. Check the SVC V/V open. 4.

  • Page 62: Troubleshooting Ch26, Ch27

    • CH 26 1. Check the connection of “U,V,W” 2. Check the insulation of IPM part. 3. Check the compressor. (same with CH21) 62 Room Air Conditioner Cause of error • Check the connection of comp wire “U,V,W” • Compressor •...

  • Page 63: Troubleshooting Ch32, Ch33, Ch40

    8) Troubleshooting CH32, CH33, CH40 Error Title code D-pipe (Inverter) temp. high (105°C(221°F) ) D-pipe (Constant) temp. high (105°C(221°F) ) CT Sensor Toff(105) °C T2(95) °C T1(90) °C COMP Frequency Normal (Hz) LEV Openness Normal (Pulse) Check Point • CH 32 1.
  • Page 64 2. Estimate the voltage of each sensor.(Plugged) 3. If the resistance of the sensor is 0 kΩ or ∞, then sensor is abnormal. Ω 64 Room Air Conditioner Cause of error • Open / Short • Normal resistor : 200kΩ / at 25°C(77°F) (Unplugged) •...
  • Page 65 10) Troubleshooting CH51, CH60 Display Title code Over capacity EEPROM Check sum Check Point • CH 51 1. Check the indoor unit capacity. Cause of error • Check the indoor unit capacity. • Over capacity • Check the combination table. Combination •...

  • Page 66: Troubleshooting Ch61, Ch62

    Normal (Hz) Check Point • CH 61 1. Check the install condition for over load. (Refrigerant, Pipe length, Blocked, …) 66 Room Air Conditioner Cause of error • Condenser pipe sensor detected high temp.(65°C(149°F)) • Heat sink sensor detected high temp.(85°C(185°F))
  • Page 67 AUGUST, 2007 P/NO : MFL41161601...

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