Instruction/ maintenance manual of the product LMU366HV LG
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Multi Air Conditioner SVC MANUAL(General) MODEL : Multi-Inverter Type CAUTION Before Servicing the unit, read the safety precautions in General SVC manual.
- 1 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Air Conditioner Service Manual CONTENTS Part 1 General Information ...........................................................
- 2 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1. Safety Precautions ........................................................................................................
Part 1 General Information - 3 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1. Safety Precautions 1.1 Cautions in Repair To prevent injury to the user or other people and property damage, the following instructions must be followed.
Part 1 General Information - 4 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Do not turn on the breaker under condition that front panel and cabinet are removed. Be sure to earth the air conditioner with an earthing conductor connected to the earthing terminal.
Part 1 General Information - 5 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1.2 Inspections after Repair Check to see if the parts are mounted correctly and wires are connected.
2. Model Line Up Part 1 General Information - 6 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 2.
Part 1 General Information 3. Nomenclature 3.1 Indoor Unit(Global) 3.2 Outdoor Unit(Global) AMN W G 09 E DL 0 Serial number A2U W 3 18 F A 0 Electrical rating Indicates that this is multi system indoo.
- 8 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 1. List of Functions & Controls ..........................................................
- 9 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 1.
Network Solution (LGAP) Optional PDI (Power Distribution Indicator) Optional PI 485 Optional Zone control Optional Low ambient operation Space Control Optional Auto Elevation Optional Defrost / Deicin.
- 11 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls * Some of functions are slightly different depending upon models, refer individual function table on "PART 2.
- 12 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 2.
- 13 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 2.4 Air flow step • Indoor fan motor control have 6 steps. • Air volume is controlled "SH", "H", "Med", Low" by remote controller.
- 14 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 3.
- 15 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 4.1 External pressure setting for 4. Installation Functions (E.S.P . Control) provide required constant air flow rate irrespective of E.
- 16 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 4.
- 17 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls [ Notes ] 1. To get the desired Airflow & E.S.P. combination from the table set the matching value from the table.
- 18 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 5.1 Hot start • When heating is started, the indoor fan is stopped or very slow to prevent the cold air carry out • When the temp.
- 19 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 6. Convenience Functions & Controls 6.1 Auto cleaning operation • Function used to perform Self Cleaning to prevent the Unit from Fungus and bad odor.
- 20 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 6.
- 21 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 6.2.3 Fuzzy Operation for Heating • According to the setting temperature selected by Fuzzy rule, when the intake air temp is 3.
- 22 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 2 Functions & Controls 6.
- 23 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 6.6 Sleep Timer Operation • When the sleep time is reached after <1,2,3,4,5,6,7,0(cancel) hr> is input by the remote control while in appliance operation, the operation of the appliance stops.
- 24 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 3. Control logic 1. Compressor ..............................................................................................
- 25 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 3 Control logic Basic principle is to control the rpm of the motor by changing the working frequency of the compressor.
Part 3 Control logic - 26 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 2.1 Frequency control Frequency that corresponds to each rooms capacity will be determined according to the difference in the temperature of each room and the temperature set by the remote controller.
Part 3 Control logic - 27 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1. At the starting (outdoor is powered on,indoor is not) reversing valve continues OFF(cooling). 2. For the cooling and defrosting operation :valve OFF, for the heating operation :valve ON 3.
Part 3 Control logic - 28 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1) There can be two situations a) Sensor is failed (e.
- 29 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 3 Control logic 5.1 Function Controlling total current to protect power semiconductor devices from burn-out by the low current (including connecting mistake) and over current.
- 30 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 3 Control logic 6.1 Function Working of outdoor fan are different in different models. Some models are single fan some are two fan type.
- 31 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 3 Control logic 7.1 Function :These are about the control of compressor, fan of outdoor unit, reversing valve, LEV.
- 32 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 3 Control logic 8.1 Control of LEV opening 1. LEV openings have a controllable ranges 70 (option) to 460 (option) pulse in both condition of cooling and heating.
- 33 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 3 Control logic 8.2 Starting control 1) Only 1 LEV will be operate as below and others are closed fully.
- 34 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 3 Control logic 1) When the accumulated compressor running time is over 3 hr.(option), oil restoring operation is made for 3 minutes.
- 35 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Part 3 Control logic 1 1.1 Function : Power module failure protection by checking the temperature of heat sink. There is a temperature sensor for checking the heat sink temperature.
- 36 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 4. T est Run 1. Check before T est Run ......................................................................................
- 37 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 4. T est Run Check to see whether there is any refrigerant leakage, and check whether the power or transmission cable is connected properly.
- 38 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 4. T est Run Is cold air discharged for more than 3 minutes ? START Test operation for indoor unit Operation mode change to Heating mode Operate the unit in cooling mode.
- 39 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 4. T est Run 3. T est Runing 3.1 PRECAUTIONS IN TEST RUN • The initial power supply must provide at least 90% of the rated voltage.
- 40 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting 1. Self-diagnosis Function .............................................................................
- 41 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting 1. Self-diagnosis Function 1.1 Error Indicator (Indoor) Ceiling Cassette T ype Display The number of times to blink = Error code 10 degrees 1 degrees Display ed No .
- 42 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting 1.3 Error Indicator (Outdoor) Outdoor Error Ex) Error 21 (DC Peack) 1 Time 1 Time 1 Time 2 Times 2 Times 2 Times 1 Sec.
- 43 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting • Procedure (1) Confirm that both the 2-way and 3-way valves are set to the open position. – Remove the valve stem caps and confirm that the valve stems are in the raised position.
- 44 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting • Procedure (1) Connect the vacuum pump to the center hose of charge set center hose (2) Evacuation for approximately one hour.
- 45 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting Lo Charging cylinder Outdoor unit Indoor unit Liquid side Gas side Open 3-Way valve 3-Way valve OPEN Open Check valve (1) Vacuum Gage • Procedure (1) Connect the charge hose to the charging cylinder.
- 46 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting T rouble analysis 1. Check temperature difference between intake and discharge air, and check for the operating current too.
- 47 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting 6.1 The Product doesn ’ t operate at all The operation check of the Indoor P.C.B. Ass'y Procedure 1) The input voltage of power mod- ule.
- 48 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting 6.2 The Product doesn't operate with the remote controller Turn on the main power Yes No A "Beeping" sound is made from the indoor unit * Refer to 10.
- 49 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting Turn on the main power. When in air circulation mode, compressor/outdoor fan is stopped. Turn off main power.
- 50 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting 6.4 When indoor Fan does not operate. Check the SSR high speed operation by remote control. (the Indoor Fan Motor is connected) Turn off main power.
- 51 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting • Confirm that the vertical louver is normally geared with the shaft of Stepping Motor.
- 52 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting 6.6 T roubleshooting Indoor Error Ω 10k Ω Check the resistance Check the voltage V 2.
- 53 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting Check the Volt.
- 54 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5. T rouble Shooting Check the resistance Ω 0 Ω CN Float CN-Float CN-D/PUMP 04 Drain pump / Float switch • Float switch Open.
5. T rouble Shooting - 55 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 07 Different Operation Mode • One of Indoor Unit op.
5. T rouble Shooting - 56 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 09 Indoor EEPROM Check Sum Error • Check sum error 1. Check the poor soldering 2. Check the insertion condition of the EEPROM 3.
5. T rouble Shooting - 57 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 10 Indoor BLDC Fan Motor Lock The Fan is not operated.
5. T rouble Shooting - 58 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 05 / 53 Title Communication (Indoor → Outdoor) • Communication poorly • Power input AC 230V. (Outdoor, Indoor) • The connector for transmission is disconnected.
5. T rouble Shooting - 59 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 21 DC PEAK (IPM Fault) • Instant over current • O.
5. T rouble Shooting - 60 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only LED02M LED02M U,V,W CONNECTOR LED01M LED01M U V W U V.
5. T rouble Shooting - 61 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 22 Max. C/T Input Over Current(18k- 13A ↑, 24k/36k-20A ↑ ) 1. Malfunction of Compressor 2. Blocking of Pipe 3.
5. T rouble Shooting - 62 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Check Point 1. Check the power source.(220V ±15%) 2. Check the fan operation is right. 3. Check the current.
5. T rouble Shooting - 63 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 23 DC Link Low voltage • DC Link volt is below 140Vdc • Check point & Normal condition • Check theCN_(L),CN_(N) Connection.
5. T rouble Shooting - 64 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Check Point 1. Check the WCN_P(L),P(N) Connection condition at the Main PCB.(Refer to outdoor wiring diagram) 2.
5. T rouble Shooting - 65 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 24 Press S/W Open • Low / High press S/W open. • Check the connection CN_L/PRESS,H/PRESS • Check the components.
5. T rouble Shooting - 66 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Check Point 1.
5. T rouble Shooting - 67 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Check Point 1. Check the Input Voltage (L–N ➔ 220V±10%) 2. Check Input Voltage Sensor output voltage (2.
5. T rouble Shooting - 68 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only GND INPUT(V) < Inv er ter PCB> < Input V olt.
5. T rouble Shooting - 69 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 26 DC Compressor Position • Compressor Starting fail error • Check the connection of comp wire “U,V,W” • Malfunction of compressor • Check the component of “IPM”, detection parts.
5. T rouble Shooting - 70 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 27 AC Input Instant over Current Error Inverter PCB input current is over100A(peak) for 2us 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref.
5. T rouble Shooting - 71 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only ■ Error Diagnosis and Countermeasure Flow Chart 28 Inverter DC link high voltage error Inv PCB DC link voltage supplied over 420V 1.
5. T rouble Shooting - 72 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Check Point 1. Check the CN_(L),CN_(N) Connection condition at the Inverter PCB.(Refer to outdoor wiring diagram) 2.
5. T rouble Shooting - 73 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 29 Inverter compressor over current Inverter compressor input current is over 30A 1. Overload operation (Pipe clogging/Covering/EEV defect/Ref.
5. T rouble Shooting - 74 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only LEV Openness (Pulse) COMP Frequency (Hz) Toff(105) ° C T1(90) ° C T2(95) ° C OFF Normal OFF Control Normal Normal Normal D-Pipe temp.
5. T rouble Shooting - 75 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Check Point 1. Check the Input Voltage (L–N ➔ 220V±10%) 2. Check Input Voltage Sensor output voltage (2.
5. T rouble Shooting - 76 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only GND INPUT(CT) < Inv er ter PCB> < CT Sensing.
5. T rouble Shooting - 77 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Ω 41 44 45 46 65 D-pipe sensor (Inverter) Air sensor.
5. T rouble Shooting - 78 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 51 Over capacity • Over capacity Combination • Check the indoor unit capacity. • Check the combination table.
5. T rouble Shooting - 79 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 60 Inverter PCB & Main EEPROM check sum error EEPROM Access error and Check SUM error 1. EEPROM contact defect/wrong insertion 2.
5. T rouble Shooting - 80 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 61 Condenser pipe sensor temp. high • Condenser pipe sensor detected high temp. • Check the load condition.
5. T rouble Shooting - 81 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 62 Heatsink High error Inverter PCB heatsink temperature is over 85°C 2. ODU fan locking 3. Heatsink assembly of INV PCB assemble condi- tion abnormal 4.
5. T rouble Shooting - 82 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only PFCM : Measuring resistance between No .19,20 pin 65 Heatsink High error Inverter PCB heatsink sensor is open or short 1.
5. T rouble Shooting - 83 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 67 Fan Lock Error Fan RPM is 10RPM or less for 5 sec. when ODU fan starts or 40 RPM or less after fan starting.
5. T rouble Shooting - 84 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 73 AC input instant over cur- rent error (Matter of software) Inverter PCB input power current is over 48A(peak) for 2ms 1.
5. T rouble Shooting - 85 - Copyright ©2010 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only < Input P ower Source Chec k P oint > < Main.
P/NO : MFL63744402 NOVEMBER, 2010.
An important point after buying a device LG LMU366HV (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought LG LMU366HV yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data LG LMU366HV - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, LG LMU366HV you will learn all the available features of the product, as well as information on its operation. The information that you get LG LMU366HV will certainly help you make a decision on the purchase.
If you already are a holder of LG LMU366HV, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime LG LMU366HV.
However, one of the most important roles played by the user manual is to help in solving problems with LG LMU366HV. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device LG LMU366HV along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
