Instruction/ maintenance manual of the product A2UC243FA0 (LMU240CE) LG Electronics
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LG Multi Type Air Conditioner SERVICE MANUAL LG CAUTION website http://www.lgservice.com • BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
2 Multi type Air Conditioner Multi type Air Conditioner Ser vice Manual T ABLE OF CONTENTS Model Number Nomenclature .................................................................................................................... 3 Symbols Used in this Manual .
Ser vice Manual 3 Model Number Nomenclature Model Number Nomenc lature Indoor Unit Outdoor Unit AMN H 3 09 4 DA 0 Serial Number A2U H 3 24 F A 0 Electrical Ratings MPS Variable Multi System Indoor Uni.
4 Multi type Air Conditioner Model Number Nomenclature Combination table Operation 1 Unit 2 Unit Combination of Indoor Unit(kBtu/h) Cooling Each Capacity Unit-A Unit-B UNIT-A(Btu/h) UNIT-B(Btu/h) Tota.
Ser vice Manual 5 Saf ety Precautions Safety Precautions T o pre v ent injur y to the user or other people and proper ty damage, the f ollowing instructions must be f ollowed. ■ Incorrect operation due to ignoring instruction will cause har m or damage.
6 Multi type Air Conditioner Saf ety Precautions Do not modify or extend the power cab le . • There is risk of fire or electric shock. Do not install, remove, or re- install the unit by y our self (customer). • There is risk of fire, electric shock, explosion, or injury.
Ser vice Manual 7 Saf ety Precautions Do not allow water to run into electric parts. • It may cause There is risk of fire, failure of the product, or electric shock. Do not store or use flammable gas or combustib les near the product. • There is risk of fire or failure of product.
8 Multi type Air Conditioner Saf ety Precautions Do not open the inlet grill of the pr oduct during operation. (Do not touch the elec- trostatic filter , if the unit is so equipped.) • There is risk of physical injury, electric shock, or product failure.
Ser vice Manual 9 Saf ety Precautions Do not bloc k the inlet or outlet of air flow . • It may cause product failure. U s eas o f tc l o t ht oc l e a n .D o not use harsh deter gents, sol- vents, etc. • There is risk of fire, electric shock, or damage to the plastic parts of the product.
10 Multi type Air Conditioner Saf ety Precautions D on o ts t e po no rp u ta n y t i n g on the product. (outdoor units) • There is risk of personal injury and failure of product. Alwa ys inser t the filter secure- ly . Clean the filter every two weeks or more often if neces- sary .
Ser vice Manual 11 Dimensions Dimensions Indoor Unit 1. Split T ype Indoor 2. Ar t Cool T ype Indoor Unit Pipe Hole Fix Hole Hanger Hole H W D Installation plate D H W W mm 840 895 570 H mm 270 282 56.
12 Multi type Air Conditioner Outdoor Unit W D L1 L2 L4 L3 H L7 L5 L6 W mm 870 H mm 800 D mm 320 L1 mm 370 L2 mm 25 L3 mm 775 L4 mm 25 L5 mm 546 L6 mm 160 L7 mm 160 UE1 24kBtu/h MODEL DIM Dimensions.
Ser vice Manual 13 Product Specifications Pr oduct Specifications Indoor Unit Nominal Cooling Capacity kcal/h(W) Btu/h Nominal Heating Capacity kcal/h(W) Btu/h Air Circulation H/M/L CMM(CFM) Setting temperature range(cool/heat) ° C Fan motor Output W Model Input V Running Current A Fan Type No.
14 Multi type Air Conditioner Outdoor Unit - Multiple piping models Product Specifications Notes: 1. Capacities are based on the following conditions: Cooling: -Indoor Temperature 26.7 ° C(80.1 ° F)DB/19.4 ° C66.9 ° F)WB -Outdoor Temperature 35 ° C(95 ° F)DB/23.
Ser vice Manual 15 Installation Installation Type "A" screw and plastic anchor Type "B" screw Remote Control Holder Installation plate Figure Figure Name Screw driver Electric Dril.
Installation 16 Multi type Air Conditioner Indoor unit 1. Do not hav e any heat or steam near the unit. 2. Select a place where there are no obstacles in front of the unit. 3. Make sure that condensation dr ainage can be conv e- niently routed aw a y .
Ser vice Manual 17 Installation Multi Piping T ype Piping length and elev ation 24k 30m(100ft) 15m(50ft) 3m(10ft) 7.5m(25ft) 7.5m(25ft) Capacity(Btu/h) Max total length of all pipes (A+B) Max length o.
18 Multi type Air Conditioner Installation The wall you select should be strong and solid enough to prevent vibration 1. Mount the installation plate on the wall with type "A" screws. If mounting the unit on a concrete wall, use anchor bolts.
Ser vice Manual 19 Installation Preparing w ork for Installation (Artcool T ype Only) Open panel front 1. First, push the front panel backward and lift it up to remove the two screws. 2. The moment of lifting the both lower parts of panel front, you can hear sound this panel came out, In this time panel front is separated 3.
20 Multi type Air Conditioner Installation ■ Sticking the installation guide map and fixing Indoor unit ■ Drill a hole in the wall • Drill the piping hole with a ø 50mm hole core drill. Drill the piping hole at either the right or the left with the hole slightly slanted to the outdoor side.
Ser vice Manual 21 Flaring Work and Connection of Piping Flaring w ork Main cause for gas leakage is due to defect in flaring work. Carry out correct flaring work in the following procedure. Cut the pipes and the cable. 1. Use the piping kit accessory or the pipes purchased locally.
22 Multi type Air Conditioner Flaring Work and Connection of Piping Check 1. Compare the flared work with the figure by. 2. If a flared section is defective, cut it off and do flaring work again. Indoor 1. Prepare the indoor unit's piping and drain hose for installation through the wall.
Ser vice Manual 23 Flaring Work and Connection of Piping 4. Indoor unit installation Hook the indoor unit onto the upper portion of the installa- tion plate.(Engage the two hooks of the rear top of the indoor unit with the upper edge of the installation plate.
24 Multi type Air Conditioner Flaring Work and Connection of Piping 1. Route the indoor tubing and the drain hose to the required piping hole position. 2. Insert the piping, drain hose, and the connecting cable into the piping hole. 3. Insert the connecting cable into the indoor unit.
Ser vice Manual 25 Flaring Work and Connection of Piping Wrap the insulation material around the connecting por- tion. 1. Overlap the connection pipe heat insulation and the indoor unit pipe heat insulation material. Bind them together with vinyl tape so that there may be no gap.
26 Multi type Air Conditioner Flaring Work and Connection of Piping ■ P anel Assembly(Art Cool T ype only) 1. First, Check the side cover assembly exactly, Fix power cord in the bottom groove of cover side left.
Ser vice Manual 27 Installation Information. For left piping. Follow the instruction below. Good case • Press on the upper side of clamp and unfold the tubing to downward slowly. Bad case • Following bending type from right to left may cause damage to the tubing.
28 Multi type Air Conditioner Flaring Work and Connection of Piping Remove the battery cover from the remote con- troller. • Slide the cover according to the arrow direction. Insert the two batteries. • Be sure that the (+) and (-) directions are correct.
Ser vice Manual 29 Flaring Work and Connection of Piping Outdoor Align the center of the pipings and sufficiently tighten the flare nut by hand. Finally, tighten the flare nut with torque wrench until the wrench clicks. • When tightening the flare nut with torque wrench, ensure the direction for tightening follows the arrow on the wrench.
30 Multi type Air Conditioner Connecting the Cable betw een Indoor Unit and Outdoor Unit Connect the cable to the indoor unit by connecting the wires to the terminals on the control board individually according to the outdoor unit connection. (Ensure that the color of the wires of the outdoor unit and the terminal No.
Ser vice Manual 31 Connect the cable to the Outdoor unit. 1. Remove the cover control from the unit by loosening the screw. Connect the wires to the terminals on the control board individually as the following. 2. Secure the cable onto the control board with the holder (clamper).
32 Multi type Air Conditioner (1) Remove two-caps on the conduit panel. (2) Make a hole appropriate for the passage of connection cable through on cap by tool. (for low voltage line) (3) Pass the connecting cable through the hole. (4) Properly connect the cable on the terminal block.
Ser vice Manual 33 Connect the cable to the indoor unit CA UTION: Pr ovide a cir cuit breaker between power sour ce and the unit as shown below . Air Conditioner Circuit Breaker Use a circuit breaker or time delay fuse . Main power source Model 24k 1 Ø , 230/208V 25A P ower source Fuse or break er Capacity 1.
34 Multi type Air Conditioner Checking the D rainage, F or ming the Pipings and Long Pipe Setting Chec king the drainage T o chec k the drainage. 1. Pour a glass of water on the evaporator. 2. Ensure the water flows through the drain hose of the indoor unit without any leakage and goes out the drain exit.
Ser vice Manual 35 Checking the D rainage, F or ming the Pipings and Long Pipe Setting Forming the piping Form the piping by wrapping the con- necting portion of the indoor unit with insulation material and secure it with two kinds of vin yl tape.
36 Multi type Air Conditioner Air Purging and Ev acuation Air and moisture remaining in the refrigerant system have undesirable effects as indicated below. 1. Pressure in the system rises. 2. Operating current rises. 3. Cooling(or heating) efficiency drops.
Ser vice Manual 37 Checking the D rainage, F or ming the Pipings and Long Pipe Setting 1. Connect the charge hose end described in the preceding steps to the vacuum pump to evacuate the tubing and indoor unit. Confirm the "Lo" knob of the manifold valve is open.
38 Multi type Air Conditioner Charging ■ Each outdoor unit is factory charged (nameplate charge) for the evaporator as well as a 7.5m(25ft) line set for each indoor line. Any time total line set is used either shorter or longer then the nominal 22.5m(75ft: for tri-zone) line set length the refrigerant charge has to be adjusted.
Ser vice Manual 39 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. 1) Prepare remote controller Remove the battery cover by pulling it according to the arrow direction.
40 Multi type Air Conditioner Operation 1. MAIN UNIT FUNCTION • DISPLA Y Op eration Indicato r • On while in appliance operation, off while in appliance pause • Flashing while in disconnection or short in Thermistor (3 sec off / 0.
Ser vice Manual 41 Operation 27 ° C(80.6 ° F) , it operates with Super-Low(while in sleep mode, with the medium airflow speed). • While compressor off, the indoor fan is off when the indoor pipe temp is below 33 ° C(91.4 ° F) , when above 35 ° C(95 ° F) , it operates with the low airflow speed.
42 Multi type Air Conditioner Operation 2) Fuzzy Operation for Dehumidification • According to the setting temperature selected by Fuzzy rule, when the intake air temp is 0.5 ° C(32.9 ° F) or more below the setting temp, the compressor is turned off.
Ser vice Manual 43 Operation • If the appliance is on pause at the time set by the timer, the pause continues. ■ Off-Timer <=> On-Timer Operation • When the set time is reached after the on/off time is input by the remote control, the on/off-timer operation is carried out according to the set time.
44 Multi type Air Conditioner Operation ■ Forced Operation • To operate the appliance by force in case that the remote control is lost, the forced operation selection switch is on the main unit of the appliance to operate the appliance in the standard conditions.
Ser vice Manual 45 "Wall Mounted Type is standard" * Functions is dependent on model type. Operation Function of Indoor Unit On/Off : Lights up during the system operation. Sleep Mode : Lights up during Sleep Mode Auto operation. Timer : Lights up during Timer operation.
46 Multi type Air Conditioner Operation • Room temperature sensor. (THERMISTOR) • Maintains the room temperature in accordance with the Setting Temp. • Indoor fan is delayed for 5 sec at the starting. • Restarting is inhibited for approx. 3 minutes.
Ser vice Manual 47 Operation Function of Outdoor Unit Outdoor Unit Two Comp algorithm Operating Step LEV Control Out door Fan Control • Compressor step varies considering condition such as room temp,outdoor temp, operating room number,Temp gap between room temp and set temp and so on.
48 Multi type Air Conditioner Operation Remote Contr ol Operation ON OFF CANCEL AUT O CLEAN ° C/ ° F SET Cooling Operation Auto Operation Healthy Dehumidification Operation Flip-up door (opened) Hea.
Ser vice Manual 49 Disassembly Disassembl y Indoor Unit Split T ype Indoor Unit Disconnect the unit from power supply before mak- ing any checks. Be sure the power switch is set to “OFF”. To remove the Grille from the Chassis. • Set the up-and-down air discharge louver to open position (horizontally) by finger pressure.
50 Multi type Air Conditioner Disassembly 2. T o remove the Contr ol Bo x. • Remove securing screws. • Pull the control box out from the chassis carefully. 3. T o remove the Disc harge Grille . • Unhook the discharge grille and pull the discharge grille out from the chassis carefully.
Ser vice Manual 51 Disassembly • Unhook the tab on the right inside of the chassis at the same time, slightly pull the evaporator toward you until the tab is clear of the slot. 5. T o remove the Motor Cover • Remove 2 securing screw. • Pull the motor cover out from the chassis carefully.
52 Multi type Air Conditioner Disassembly Art Cool T ype Indoor Unit CA UTION: Disconnect the unit fr om power suppl y before making an y chec ks. Be sure the power s witch is set to “OFF”. 1. To remove the Grille from the Chassis. - Pull the grille bottom, the remove 2 securing screws.
Ser vice Manual 53 Disassembly 3) To remove the Evaporator. - Remove 4 screws securing the evaporator. - Pull the evaporator out from the chassis carefully. 4) Before removing the Turbo Fan. - Remove the securing screws from the chassis. - Pull the pipe cover, top cover and the air guide.
54 Multi type Air Conditioner Schematic Diagram Schematic Dia gram Electr onic Control De vice 1. Indoor Unit 1) Split T ype.
Ser vice Manual 55 Schematic Diagram 2) Art Cool T ype OUTDOOR 64 17 Digit2 10 LED2 LED4 LED3 LED1 DEFROST ON/OFF TIMER SLEEP 6(d) Digit1 c 5 d e 8(c) 7(e) b g f a 9(b) 1(g) 3(a) 4(f) 4 12 16 15 14 13 8 10 11 9 6 7 5 2 3 1 45 27 22 20 19 18 21 25 24 23 26 37 32 30 29 28 31.
56 Multi type Air Conditioner Schematic Diagram 2. Outdoor Unit P07 SW01F OR2H,OR7H,OR10H:91K,OR3H-4H,OR8H-9H,OR11H-12H:15K(ETC:20K) R03T 1 1 DC 5V 56K R04T 1K 1 2 7036P IC01A CN-JIG 3 4 3 4 2 2 JIG_RX JIG_TX DC 5V 10K R01T 1K R02T C01H-C04H : 103 P21 21 JIG_RX 26 OSC01B CST-8.
Ser vice Manual 57 Schematic Diagram 23.2K 8.06K 8.06K 23.2K 23.2K 8.06K 1% 1% 51.1K 102 100V C25M 1% 9.1k R27M 100uf C24M + 2 5 4 6 100uF 25V C26M R28M 13K 1% 1 5 + R29M,2K,1% 4 22 51.1K 10K 1 2.94K 6 7 4.7K PWM(C) 35.7K 4.3K R26M 10.2K 3 2 1 21.5K 6.
58 Multi type Air Conditioner 1. Room T ype Indoor Unit -S4/SE chassis 2. Ar t Cool T ype Indoor Unit Wiring Diagram Schematic Diagram 3. Outdoor Unit 1.
Ser vice Manual 59 Schematic Diagram 1. Indoor Unit MAIN P .C.B ASM 1) Split T ype Components Locations • T OP VIEW •B O T T O MV I E W PCB :6870A90409B ASSY :6871A20771 6871A20782.
60 Multi type Air Conditioner Schematic Diagram 2) Art Cool T ype • TOP VIEW • BOTTOM VIEW.
Ser vice Manual 61 Schematic Diagram 2. Display ASSEMBL Y 1) Split T ype (6871A20680) 2) Art Cool T ype (6871A20462) BOTTOM VIEW TOP VIEW.
62 Multi type Air Conditioner Schematic Diagram 3. Outdoor Unit 1) Component side.
Ser vice Manual 63 Schematic Diagram 2) Solder side.
64 Multi type Air Conditioner S/W Cons. Comp (GK094K) C/V1 C/V2 Th1 Th2 Acc. A-Room B-Room LEV-A LEV-B Air Sensor Eva. Sensor Eva. Sensor 9.52 6.35 LEV 15RC R/Valve 5220AR3228E Air Sensor strainer strainer Sensor Cons. Comp (GK141K) Ø Ø 1. A2UH243F A0(LMU240HE) 2.
Ser vice Manual 65 T roub leshooting Guide ■ 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.
66 Multi type Air Conditioner T roub leshooting Guide T rouble anal ysis 1. Check temperature difference between intake and discharge air, and operating current.
Ser vice Manual 67 T roub leshooting Guide Electr onic P ar ts T roub leshooting Guide ❇ Refer to electronic contorol device drawing & schematic diagram. The Pr oduct doesn’t operate at all. Turn off the main power and wait until LED on outdoor PCB is off.
68 Multi type Air Conditioner T roub leshooting Guide Turn on main power. While the compressor has been stopped, the compressor does not operate owing to the delaying function for 3 minutes after stopped. When the compressor stopped Indoor Fan is driven by a low speed.
Ser vice Manual 69 T roub leshooting Guide 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.
70 Multi type Air Conditioner T roub leshooting Guide When indoor F an does not operate . Check connecting condition of the CN-MOTOR CON- NECTOR Does the voltage of terminal of CN-DC/DC CONNECTOR in I.
Ser vice Manual 71 T roub leshooting Guide When the louver does not operate . T rouble 5 When V er tical Louver does not operate . • Confirm that the Vertical Louver is normally geared with the shaft of Stepping Motor.
72 Multi type Air Conditioner T roub leshooting Guide Err or Code ■ Trouble Shooting Error Title Cause of error Check point & Normal condition code 01 Indoor air sensor 02 Indoor inlet pipe sens.
Ser vice Manual 73 T roub leshooting Guide Error Title Cause of error Check point & Normal condition code 05 / 53 Communication (Indoor ➔ Outdoor) • Communication poorly • Power input AC 230V.(Outdoor, Indoor) • The connector for transmission is disconnected.
74 Multi type Air Conditioner T roub leshooting Guide Error Title Cause of error Check point & Normal condition code 33 D-Pipe Temp. High • Discharge sensor temp. high • Check the discharge pipe sensor. • Check the install condition for over load.
Ser vice Manual 75 T roub leshooting Guide Error Title Cause of error Check point & Normal condition code 44 Outdoor air sensor 45 Condensor pipe sensor 47 D-Pipe sensor • Open / Short • Solde.
76 Multi type Air Conditioner 2-wa y , 3-wa y V alv e 2-wa y , 3-wa y V alve 2-way Valve (Liguid Side) 3-way Valve (Gas Side) Works Shaft position Shaft position Service port Shipping Closed Closed Cl.
Ser vice Manual 77 2-wa y , 3-wa y V alv e (1) Pumping down • Procedure 1. Confirm that both the gas side and liquid side 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.
78 Multi type Air Conditioner 2-wa y , 3-wa y V alv e (2) Ev acuation (All amount of refrigerant leaked) • Procedure 1. Confirm that both the liguid side valve and gas side valve are set to the opened position. 2. Connect the vaccum pump to the center hose of the manifold gauge.
Ser vice Manual 79 2-wa y , 3-wa y V alv e (3) Gas Charging (After Evacuation) • Procedure 1. Connect the gauge to the charging cylinder. - Connect the charge hose which you disconnect- ed from the vacuum pump to the valve at the bottom of the cylinder.
80 Multi type Air Conditioner 135301 152302-2 152313 152302-1 342800 263230-2 263230-1 359011 131410 733010 135311 135312 159901 268712 146811 147582 346810 135516 35211B 354210 249951 352150 268714 6.
Ser vice Manual 81 Exploded View & Replacement P ar ts List P ar ts List (S4, SE chassis) PART No. S4 chassis SE chassis AMNH093D4A0 (LMN090HE) AMNC093D4A0 (LMN090CE) AMNH123DEA0 (LMN120HE) AMNC12.
82 Multi type Air Conditioner Exploded View & Replacement P ar ts List 135515 267110 135500-3 268714 352150 35211B 263230-2 147581 359012 349600 352380 146811 146811 147581 346810 147581 268712 13.
Ser vice Manual 83 Exploded View & Replacement P ar ts List P ar ts List (SP3 chassis) PART No. AMNH093APM0 (LMAN090HNS) AMNC093APM0 (LMAN090CNS) AMNH123APM0 (LMAN120HNS) AMNC123APM0 (LMAN120CNS) .
84 Multi type Air Conditioner Exploded View & Replacement P ar ts List 548490 552202 561410 649950 668711 435511 552203-1 552203-2 552203-1 552203-2 554160-1 554160-2 552113-2 552204-1 552204-2 26.
Ser vice Manual 85 Exploded View & Replacement P ar ts List P ar ts List (A2UH243F A0(LMU240HE), A2UC243F A0 (LMU240CE)) 437210 PANEL ASSEMBLY,FRONT(SUB) 1A00197C 1A00197C R 137213-1 PANEL ASSEMBL.
P/No.: 3828A20462Z April, 2006 Printed in Korea.
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If you already are a holder of LG Electronics A2UC243FA0 (LMU240CE), 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 A2UC243FA0 (LMU240CE).
However, one of the most important roles played by the user manual is to help in solving problems with LG Electronics A2UC243FA0 (LMU240CE). Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device LG Electronics A2UC243FA0 (LMU240CE) 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
