Instruction/ maintenance manual of the product General Wall Mounted-Inverter Type LG Electronics
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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.
2 Room Air Conditioner Air Conditioner Ser vice Manual CONTENTS P art 1 General Information 1. Safety Precautions ........................................................................................................4 2. Nomenclature ...............
Ser vice Manual 3 1. Safety Precautions ......................................................................................................... ...4 2. Nomenclature ....................................................................................
4 Room Air Conditioner P ar t 1 General Inf ormation 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. ■ Incorrect operation due to ignoring instruction will cause harm or damage.
Ser vice Manual 5 P ar t 1 General Inf ormation Do not tur n on the break er when the front panel and cabinet are remov ed. Be sure to ground the air conditioner with an ear thing conductor connected to the ear thing ter minal. Conduct repair works after checking that the refrigerating cycle section has cooled down sufficiently .
6 Room Air Conditioner P ar t 1 General Inf ormation Check to see if the par ts are mounted correctly and wires are connected. Improper installation and connections can cause an electric shock or an injur y . Check whether the installation platf orm or frame has corroded.
Ser vice Manual 7 P ar t 1 General Inf ormation 2. Nomenc lature 2.1 Global Model Name Code Type Code of Model Meaning 1 Production Center, A~Z L: Chang-won R22 Refrigerant A: Chang-won R410A 2 Produc.
8 Room Air Conditioner P ar t 2 Functions & Contr ols 1. List of Controls & Functions ..........................................................................................9 2. Basic Mode Controls ..........................................
Ser vice Manual 9 P ar t 2 Functions & Controls 1. List of Functions & Contr ols Cooling Mode Heating Mode Healthy Dehumidification Automatic operation Auto Changeover Jet Cool Jet Heat Energy.
10 Room Air Conditioner P ar t 2 Functions & Controls 2. Basic Mode Contr ols 2.1 Cooling Mode Setting Temp. -0.5 ° C(-1 ° F) +0.5 ° C(1 ° F) Comp. OFF Thermo ON Thermo OFF INV. Comp. Frequency Low High Low High • Operating frequency of compressor depends on the load condition, like the difference between the room temp.
Ser vice Manual 11 P ar t 2 Functions & Controls 2.3 Health y Dehumidification operation • When the dehumidification operation is set by the remote controller, the intake air temperature is detected and the set- ting temp. is automatically set according to the intake air temperature.
12 Room Air Conditioner P ar t 2 Functions & Controls 3. Special Mode Contr ols 3.1 Jet Cool operation • In the heating mode or Fuzzy operation, the Jet cool function does not work. When it is input while in other mode of operation (cooling, dehumidification, ventilation), the Jet cool operation takes place.
Ser vice Manual 13 P ar t 2 Functions & Controls 4. Utility Functions 4.1 For ced 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.
14 Room Air Conditioner Mode2 Mode3 Mode4 Mode5 Mode6 Mode7 Mode8 Mode9 OPEN CLOSED 8 ° Cooling Operation 120 ° Mode2 Mode3 Mode4 Mode5 Mode6 Mode7 Mode8 Mode9 OPEN CLOSED 8 ° Heating Operation 120.
Ser vice Manual 15 P ar t 2 Functions & Controls 4.6 Sleep mode A uto contr ol • 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.
16 Room Air Conditioner P ar t 2 Functions & Controls 5.1 Five Seconds Stand-b y (fan) • The indoor unit fan rotates after 5 seconds when unit is turned on. 5.2 T w o Minutes Stand-b y (comp.) • Compressor starts two minutes later, after it is turned off 5.
Ser vice Manual 17 P ar t 2 Functions & Controls 5.5 A utomatic defr ost 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.
18 Room Air Conditioner P ar t 2 Functions & Controls 5.5.2 18,24,30kBtu/h Model • Starting to the defrosting operation 1) Defrost operation will be start when the conditions below are matched a) Accumulation time of operation and the period after completion of defrost = 35 min.
Ser vice Manual 19 P ar t 2 Functions & Controls • Defrosting Contr ol Algorithm 1) Lowering the compressor frequency when starts the defrosting operation.
20 Room Air Conditioner P ar t 2 Functions & Controls 5.6 P o wer Rela y Contr ol • Power relay turns on 1 second later after the power is supplied to the outdoor unit. • Control sequence : power on → PTC operating → power relay on 5.7 In verter 1.
Ser vice Manual 21 P ar t 2 Functions & Controls 5.8 Overheating Pr otection (P o wer 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.
22 Room Air Conditioner P ar t 2 Functions & Controls 5.8.2 18,24,30kBtu/h Model • Function : Power module failure protection by checking the temperature of heat sink.
Ser vice Manual 23 P ar t 2 Functions & Controls 5.9 T otal Current Control (Over Current Pr otection) 5.9.1 9,12kBtu/h Model 1) CT1 control • If the operating current reaches I1, the operating frequency of the compressor decreases.
24 Room Air Conditioner P ar t 2 Functions & Controls 5.9.2 18,24,30kBtu/h Model 1) Detection : check the output DC voltage of Current Transformer(CT). 2) Current Transformer Sensing Error a) In initial power input, if the CT output is over 4.0V (25A) it shows.
Ser vice Manual 25 P ar t 2 Functions & Controls 5.10 DC P eak contr ol 5.10.1 DC P eak Current Error b y a fault signal of IPM • If the operating current of IPM reaches 35A 3A, the compressor stops instantly.
26 Room Air Conditioner P ar t 2 Functions & Controls 5.11.2 In verter Compressor (18,24,30kBtu/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.
Ser vice Manual 27 P ar t 2 Functions & Controls 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.
28 Room Air Conditioner P ar t 2 Functions & Controls 5.12 Low Ambient contr ol 5.12.1 9,12kBtu/h Model • If outdoor temperature drops below certain temperature, liquid back is prevented by reducing fan speed.
Ser vice Manual 29 P ar t 2 Functions & Controls 5.14 Oil equalizing contr ol(30kBtu/h Model) Operating condition : 1) When the continuous inverter compressor running time at under 40 Hz(option) is over 2 hours(option) in 2 com- pressor system, oil restoring operation is made.
30 Room Air Conditioner P ar t 3 T est Run 1. Check bef ore T est Run ...................................................................................................31 2. T est Run Flow chart .......................................................
Ser vice Manual 31 P ar t 3 T est 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.
32 Room Air Conditioner 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.
Ser vice Manual 33 P ar t 3 T est Run 1. Check that all tubing and wiring have been properly con- nected. 2. Check that the gas and liquid side service valves are fully open. Settlement of outdoor unit • Anchor the outdoor unit with a bolt and nut(ø10mm) tightly and horizontally on a concrete or rigid mount.
34 Room Air Conditioner P ar t 4 T r oub le Shooting 1. 2-W a y , 3-Wa y V alve ........................................................................................................3 5 2. Pumping Down ...............................................
Ser vice Manual 35 P ar t 4 T rouble Shooting 2-way Valve (Liquid Side) 3-way Valve (Gas Side) Shaft position Shaft position Service port Closed Closed Closed (with valve cap) (with valve cap) (with c.
36 Room Air Conditioner P ar t 4 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. – Be sure to use a hexagonal wrench to operate the valve stems.
Ser vice Manual 37 P ar t 4 T rouble Shooting • Procedure (1) Connect the vacuum pump to the center hose of charge set center hose (2) Evacuation for approximately one hour.
38 Room Air Conditioner P ar t 4 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) CLOSE Vacuum Gage • Procedure (1) Connect the charge hose to the charging cylinder.
Ser vice Manual 39 P ar t 4 T rouble Shooting T r ouble anal ysis 1. Check temperature difference between intake and discharge air, and operating current.
40 Room Air Conditioner P ar t 4 T rouble Shooting 2. Check temperature and pressure of refrigeration cycle. 1. The suction pressure is usually 8.5~9.5 kg/cm 2 . g at normal condition. 2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty.
Ser vice Manual 41 P ar t 4 T rouble Shooting The Product doesn ’ t operate at all. (9~30kBtu/h Model) Turn off the main power and wait until LED on outdoor PCB is off.
42 Room Air Conditioner P ar t 4 T rouble Shooting Turn on main power. While the compressor has been stopped, the compressor does not operate owing to the delaying function for 2 minutes after stopped. When the compressor stopped Indoor Fan is driven by a low speed.
Ser vice Manual 43 P ar t 4 T rouble Shooting Turn on the main power. When in air circulation mode, compressor/outdoor fan is stopped. Turn off main power. Check the electrical wiring diagram of Outdoor side. Check the open or short of connecting wires between Indoor and Outdoor.
44 Room Air Conditioner P ar t 4 T rouble Shooting Turn on the main power. When in air circulation mode, compressor/outdoor fan is stopped. Turn off main power. Check the electrical wiring diagram of Outdoor side. Check the open or short of connecting wires between Indoor and Outdoor.
Ser vice Manual 45 P ar t 4 T rouble Shooting When indoor Fan does not operate.(9~30kBtu/h Model) T roub le 5 Check the SSR high speed operation by remote control. (the Indoor Fan Motor is connected) Turn off main power. Check the connection of CN-FAN.
46 Room Air Conditioner P ar t 4 T rouble Shooting 7. Self-diagnosis Function ■ Error Indicator • The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble. • Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table.
Ser vice Manual 47 P ar t 4 T rouble Shooting ■ 18,24,30kBtu/h Model Indoor Error 00 No Error ON 01 Indoor Room themistor error 1time OFF 02 Indoor in-piping sensor error 2times OFF 03 Remote contro.
48 Room Air Conditioner P ar t 4 T rouble Shooting Case of error LED02G (Green) LED01G (Red) Contents Error code CT Circuit malfunction Open / Short Open / Short Open / Short Open / Short Open / Short Over load combination Communication Poorly Check sum mismatching Cond.
Ser vice Manual 49 ■ T r oubleshooting Guide(9,12kBtu/h Model) P ar t 4 T rouble Shooting Description Cause of error 1 • Indoor TH. (sensor) is short or open • Indoor TH. (sensor) is not connected to the indoor pcb assembly • Damage or defect on the sensing circuit of indoor pcb assembly.
50 Room Air Conditioner P ar t 4 T rouble Shooting 4 • 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. (R01H, R02H, C01H) Heat-sink Temp. is over 95 ° C(203 ° F) Heat-sink TH.
Ser vice Manual 51 P ar t 4 T rouble Shooting 5 • Wrong or missing wiring between indoor and outdoor unit cable • Defect of communication components in indoor pcb assembly • Defect of communicat.
52 Room Air Conditioner P ar t 4 T rouble Shooting Cause of error 6 • Supplied power is not normal • Comp Connector (CN-U,V,W) is disconnected or inserted to wrong position • Compressor is damag.
Ser vice Manual 53 P ar t 4 T rouble Shooting 7 • Supplied power is not normal • Indoor/outdoor fan is locked • Too much refrigerant • Defect in current sensing circuit in outdoor pcb assembly.
54 Room Air Conditioner P ar t 4 T rouble Shooting 8 • Indoor fan is locked or separated • Fan connector is not connected to indoor pcb assembly • Defective in DC-fan driving circuit Indoor fan .
Ser vice Manual 55 P ar t 4 T rouble Shooting 10 • D_pipe TH. is short or open • D_pipe TH. is not connected to the outdoor pcb assembly • Damage or defect on the sensing circuit of outdoor pcb assembly D-Pipe TH. is short or open D_PIPE TH. is connected to Outdoor pcb assembly ? D_PIPE TH.
56 Room Air Conditioner P ar t 4 T rouble Shooting 1) T roubleshooting CH01, CH02, CH06 Ω 10k Ω Check the resistance Check the voltage V 2.5VDC 01 02 06 Indoor air sensor Indoor inlet pipe sensor .
Ser vice Manual 57 P ar t 4 T rouble Shooting 2) T roubleshooting CH05, CH53 05 / 53 Communication (Indoor → Outdoor) • Communication poorly • Power input AC 208~230V. (Outdoor, Indoor) • The connector for transmission is disconnected. • The connecting wires are misconnected.
58 Room Air Conditioner P ar t 4 T rouble Shooting 3) T roubleshooting CH21 Ω Comp Copper pipe Resistance( Ω ) at 20°C(68°F) Resistance( Ω ) at 20 ° C(68 °F) 0.64 0.64 0.64 Inverter comp. V-W W-U U-V Terminal 0.8 0.8 0.8 Constant comp. 2M Ω 2M Ω 2M Ω Inverter comp.
Ser vice Manual 59 P ar t 4 T rouble Shooting 4) T roubleshooting CH21, CH22 V + - +- +- 21 22 Max. C/T C/T Internal circuit Over current (14A ) Initial current error Malfunction of compressor Blocking of pipe Low voltage input Refrigerant, pipe length, blocked, … Malfunction of current detection circuit.
60 Room Air Conditioner P ar t 4 T rouble Shooting 5) T roubleshooting CH23, CH28 V 23 28 DC Link Low voltage. DC Link High voltage • DC link volt. is 140VDC . • DC link volt. is 420VDC . • Check the power source. • Check the components. • Check the power source.
Ser vice Manual 61 P ar t 4 T rouble Shooting 6) T roubleshooting CH24, CH25 CN TRNAS1 CN PRESS TRANS1 50Hz, DC12V 24 25 Press S/W Open Input voltage • Low / High press S/W open. • Abnormal Input voltage (140VAC , 300VAC ). • Check the connection of “CN_Press”.
62 Room Air Conditioner P ar t 4 T rouble Shooting 7) T roubleshooting CH26, CH27 E C B E C B E C B 26 27 DC Compressor Position PSC Fault • Compressor position detect error • Over current at “IGBT” • Check the connection of comp wire “U,V,W” • Malfunction of compressor • Check the component of “IPM”, detection parts.
Ser vice Manual 63 P ar t 4 T rouble Shooting 8) T roubleshooting CH32, CH33, CH40 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. (221) ° F (194) ° C (203) ° C 32 33 40 D-pipe (Inverter) temp.
64 Room Air Conditioner P ar t 4 T rouble Shooting 9) T roubleshooting CH41, CH44, CH45, CH46, CH47, CH65 Ω 41 44 45 46 47 65 D-pipe sensor (Inverter) Air sensor Condenser Pipe sensor Suction Pipe s.
Ser vice Manual 65 P ar t 4 T rouble Shooting 10) T roubleshooting CH51, CH60 51 60 Over capacity EEPROM Check sum • Over capacity Combination • Check sum error • Check the indoor unit capacity. • Check the combination table. • Check the PCB ASM P/No.
66 Room Air Conditioner P ar t 4 T rouble Shooting 11) T roubleshooting CH61, CH62 61 62 Condenser pipe sensor temp. high Heat sink sensor temp. high • Condenser pipe sensor detected high temp.(65°C(149°F)) • Heat sink sensor detected high temp.
P/NO : MFL41161601 AUGUST, 2007.
An important point after buying a device LG Electronics General Wall Mounted-Inverter Type (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 Electronics General Wall Mounted-Inverter Type 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 Electronics General Wall Mounted-Inverter Type - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, LG Electronics General Wall Mounted-Inverter Type you will learn all the available features of the product, as well as information on its operation. The information that you get LG Electronics General Wall Mounted-Inverter Type will certainly help you make a decision on the purchase.
If you already are a holder of LG Electronics General Wall Mounted-Inverter Type, 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 Electronics General Wall Mounted-Inverter Type.
However, one of the most important roles played by the user manual is to help in solving problems with LG Electronics General Wall Mounted-Inverter Type. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device LG Electronics General Wall Mounted-Inverter Type 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
