Instruction/ maintenance manual of the product LAN091CNP, LAU091CNP, LAN121CNP, LAU121CNP, LAN091HNP, LAU091HNP, LAN121HNP, LAU121HNP, LA090CPI, LA LG Electronics
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LG Room Air Conditioner SERVICE MANUAL LG MODELS: LAN091CNP (ASNC091F2G0) LAU091CNP (ASUC091FUG0) LAN121CNP (ASNC121F2G0) LAU121CNP (ASUC121FUG0) LAN091HNP (ASNH091F2G0) LAU091HNP (ASUH091FUG0) LAN121.
2 Room Air Conditioner Air Conditioner Ser vice Manual T ABLE OF CONTENTS Safety Precautions ........................................................................................................................................................... 3 Dimensions .
Ser vice Manual 3 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 ollow ed. ■ Incorrect operation due to ignoring instruction will cause har m or damage.
4 Room Air Conditioner Saf ety Precautions ■ Operation Be cautious when unpacking and installing the product. • Sharp edges could cause injur y . Be especially careful of the case edges and the fins on the con- denser and e vapor ator . For installation, alwa ys contact the dealer or an A uthorized Service Center .
Ser vice Manual 5 Saf ety Precautions Use a dedicated outlet for this appliance. • There is risk of fire or electr ical shock. Grasp the plug to remove the cord fr om the outlet. Do not touch it with wet hands. • There is risk of fire or electr ical shock.
6 Room Air Conditioner Saf ety Precautions ■ Installation Do not open the inlet grill of the product during operation. (Do not touch the electr ostatic filter , if the unit is so equipped.) • There is risk of physical injury , electric shock, or product f ailure.
Ser vice Manual 7 Saf ety Precautions ■ Operation Do not install the product where the noise or hot air from the out- door unit could damage the neighborhoods. • It ma y cause a problem f or your neighbors. Use two or more people to lift and transport the air conditioner .
8 Room Air Conditioner Alwa ys insert the filter securely . Clean the filter every tw o weeks or more often if necessary . • A dir ty filter reduces the efficiency of the air conditioner and could cause product malfunction or dam- age. Do not insert hands or other objects through the air inlet or outlet while the air conditioner is plugged in.
Ser vice Manual 9 Dimensions Dimensions Indoor Unit This symbol aler ts y ou to the risk of electric shock. This symbol aler ts y ou to hazards that could cause harm to the air conditioner . This symbol indicates special notes. NOTICE Symbols Used in this Manual Pipe Hole Fix Hole Hanger Hole H W D W mm(inch) 600(23.
10 Room Air Conditioner Dimensions Outdoor Unit W L2 L3 L1 D H L4 L5 Gas side (3-way valve) Liquid side (2-way valve) MODEL 9k, 12k Models DIM unit W mm 770(30.3) H mm 540(21.3) D mm 245(9.6) L1 mm 285(11.2) L2 mm 64(2.5) L3 mm 518(20.4) L4 mm 10(0.4) L5 mm 100(3.
Ser vice Manual 11 Product Specifications Pr oduct Specifications Models Cooling Capacity kW (Min~Rating~Max) Btu/h Heating Capacity kW (Min~Rating~Max) Btu/h Power Input Cooling/Heating W Running Current Cooling/Heating A Starting Current Cooling/Heating A EER W/W Btu/h.
12 Room Air Conditioner Installation Installation Installation P ar ts Installation T ools Read carefully, and then follow step by step. Type "A" screw and plastic anchor Type "B" .
Ser vice Manual 13 Installation Map Installation parts you should purchase. NOTICE (Left and right are identical) More than 28"(70cm) More than 23.6"(60cm) Sleeve Bushing-Sleeve Putty(Gum Type Sealer) Vinyl tape (Wide) • To carry out the drainage test, remove the air filter and pour water into the heat exchanger.
14 Room Air Conditioner 1. Check the quality label on the indoor and outdoor unit. 2. Make certain that the refr igerant is R-410A. THIS PRODUCT CONT AINS R-410A REFRIGERANT 1) Diff erent compressor oil - R-410A(P olyol ester) / R-22(Mineral). - Do not mix the e xisting mineral oil.
Ser vice Manual 15 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 . 4. Do not install near a doorwa y .
16 Room Air Conditioner Piping Length and Elev ation Outdoor unit Indoor unit A B Outdoor unit Indoor unit A B A Oil trap Outdoor unit Indoor unit B If piping length is more than 16.4ft(5m) CA UTION: Capacity is based on standard length and maxim um allowance length is on the basis of reliability .
Ser vice Manual 17 Installation Preparing W ork f or Installation Open panel front 1. Pull the upper par t of the front panel. 2. Lift up the panel. 3. T o detach the front panel, remov e the two scre ws at the lower par t. 4. Detach the front panel from the body .
18 Room Air Conditioner Installation Fixing Indoor Unit • Drill the piping hole with a ø 50mm hole core drill. Drill the piping hole at either the r ight or the left with the hole slightly slanted to the outdoor side. Drill a Hole in the W all 5-7mm (0.
Ser vice Manual 19 Flaring work and connection of piping Flaring w ork and connection of piping Flaring W ork Main cause f or gas leakage is due to def ect in flaring wor k. Carr y out correct flaring work in the follo wing procedure. Cutting the pipes and the cable.
20 Room Air Conditioner Flaring work and connection of piping Check 1. Compare the flared work with the figure by . 2. If a flared section is def ective , cut it off and do flaring work again. Indoor Preparing the indoor unit's piping and drain hose f or installation through the wall.
Ser vice Manual 21 Connecting the piping with the indoor unit and drain hose with drain pipe 1. Align the center of the pipings and sufficiently tighten the flare nut b y hand. 2. Tighten the flare nut with a wrench. 3. When e xtending the drain hose at the indoor unit, install the drain pipe .
22 Room Air Conditioner Flaring work and connection of piping CA UTION: Installation Information For right piping. Follow the instruction belo w . Good case • Press on the upper side of clamp and unf old the tubing to downward slo wly . Bad case • F ollowing bending type from left to right may cause damage to the turbing.
Ser vice Manual 23 Flaring work and connection of piping Put a couple drops of refrigerant oil on the f ace of the flare bef ore assembling taking care not to add any contaminants . Align the center of the pipings and sufficiently tighten the flare nut b y hand.
24 Room Air Conditioner Connecting the cable betw een indoor unit and outdoor unit Connecting the cable between indoor unit and outdoor unit Connecting the Cables 1. Remov e the cover control from the unit b y loosening the screw . 2. Dismount caps on the conduit panel.
Ser vice Manual 25 Connecting the cable betw een indoor unit and outdoor unit Connection method of the connecting cable(Example) 1. Dismount two-caps on the conduit panel. 2. Make a hole appropriate f or the passage of connec- tion cable through on cap b y tool.
26 Room Air Conditioner Connecting the cable betw een indoor unit and outdoor unit After the confirmation of the above conditions, prepare the wiring as follows: 1) Never fail to have an individual power circuit specifically for the air conditioner. As for the method of wiring, be guided by the circuit diagram posted on the inside of control cover.
Ser vice Manual 27 Checking the dr ainage and f or ming the pipings Chec king the drainage and f orming the pipings Chec king the Drainage T o chec k the drainage . 1. P our a glass of water on the e v aporator . 2. Ensure the water flo ws through the drain hose of the indoor unit without any leakage and goes out the drain e xit.
28 Room Air Conditioner Checking the dr ainage and f or ming the pipings Forming the Piping Form the piping by wrapping the connect- ing portion of the indoor unit with insula- tion material and secure it with two kinds of vinyl tapes.
Ser vice Manual 29 Air purgingd AIR PURGING Air Purging Air purging The air and moisture remaining in the refrigerant system hav e undesirable eff ects as indicated below . 1. Pressure in the system rises. 2. Operating current rises. 3. Cooling(or heating) efficiency drops.
30 Room Air Conditioner Air purgingd Soap water method 1. Remov e the caps from the 2-wa y and 3-w ay v alv es. 2. Remov e the ser vice-por t cap from the 3-wa y valv e. 3. T o open the 2-wa y v alve turn the valv e stem counterclock- wise appro ximately 90 ° , wait f or about 2~3 sec, and close it.
Ser vice Manual 31 Air purgingd Charging ■ Each outdoor unit is factory charged (nameplate charge) for the evaporator as well as a 7.5m(25ft) line set. Any time a line set is used either shorter or longer then the nominal 7.5m(25ft) line set length the refrigerant charge has to be adjusted.
32 Room Air Conditioner Air purgingd 1. Fir st, Check the side co ver assembl y exactl y , and fix the power cor d in the bottom groo ve of cover side left. 2. Assemble connecting lead wire with controller , fix the upper par t of panel front, and matc h the lower part of panel front.
Ser vice Manual 33 T est running TEST R UNNING R-410A 95 ° F(35 ° C) 8.5~9.5kg/cm 2 G(120~135 P.S.I.G.) Outside ambient TEMP. Refrigerant The pressure of the gas side service valve. 1. Check that all tubing and wiring are properly connected. 2. Check that the gas and liquid side service valv es are fully open.
34 Room Air Conditioner T est running If the actual pressure is higher than shown, the system is most lik ely ov er-charged, and charge should be remov ed. If the actual pressure are lower than shown, the system is most lik ely undercharged, and charge should be added.
Ser vice Manual 35 Ho w to replace picture & photograph How to replace picture & photog raph 1 . T ur n off power and then open the upper par t of front panel. 2 . Pull out the both links of low er par t of front panel, as described in the below picture.
36 Room Air Conditioner Operation Operation Indoor Unit Operation ON/OFF by Remote controller Sensing the Room Temperature Room temperature control Starting Current Control Time Delay Safety Control I.
Ser vice Manual 37 The function of main contr ol INTAKE AIR TEMP. SETTING TEMP. +1 ° F (Compressor ON) SETTING TEMP. -1 ° F (Compressor OFF) Setting fan speed Setting fan speed More than 3 minutes M.
38 Room Air Conditioner . A uto Operation (Electronic contr ol mode) • The operation procedure is shown below. (Cooling & Heating Model) ❋ If initial mode is decided, that mode is continued without the room temperature changing.
Ser vice Manual 39 Operation ■ Auto Operation for Dehumidification(only Heating Model) • The Setting temperature will be same that of the auto operation for cooling.
40 Room Air Conditioner Operation 6. Heating Operation Mode(only Heating Model) The unit will operate according to the setting conditions by the remote controller. The operation diagram is shown below. INTAKE AIR TEMP. SETTING TEMP. + 6 ° F (Compressor OFF) SETTING TEMP.
Ser vice Manual 41 7. Cooling or Heating Mode with Sleep Mode A uto Control • When selecting the Cooling( ) or the Heating( ) combined with the Sleep Mode Auto Control( ), the operation diagram is as following.
42 Room Air Conditioner 8. Forced Operation Operation procedures when the remote control can't be used. The operation will be started if the power button is pressed.
Ser vice Manual 43 Operation Displa y Function Self-diagnosis Function Signal Receptor Receives the signals from the remote control.(Signal receiving sound: two short beeps or one long beep.) Operation Indication Lamps On/Off : Lights up during the system operation.
44 Room Air Conditioner Operation Controls ON OFF CANCEL SET ° C/ ° F AUT O CLEAN 1 3 5 4 9 10 12 18 16 7 2 8 13 15 11 6 Cooling Operation Auto Operation or Auto Changeover Healthy Dehumidification .
Ser vice Manual 45 Disassembl y Disassembly Indoor Unit W ARNING: Disconnect the unit from 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.
46 Room Air Conditioner Disassembly 3. To remove the Evaporator. - Remove hole tubing holde. - Remove 2 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.
Ser vice Manual 47 Schematic Diagram Schematic Dia gram Heat Pump/Cooling Only Series(Indoor Unit).
48 Room Air Conditioner Schematic Diagram Heat Pump Series/ Cooling Only Series (Outdoor Unit).
Ser vice Manual 49 Schematic Diagram INDOOR UNIT P .W .B. ASSEMBL Y • P/No.: 6871A20999A (PCB ASSEMBL Y , MAIN) T op Vie w Bottom View.
50 Room Air Conditioner Schematic Diagram • P/No.: 6871A20901C (PCB ASSEMBL Y , MAIN) OUTDOOR UNIT P .W .B. ASSEMBL Y T op Vie w Bottom View.
Ser vice Manual 51 Schematic Diagram DISPLA Y P .W .B. ASM • P/No.: 6871A20921A (PCB ASSEMBL Y).
52 Room Air Conditioner Schematic Diagram Wiring Diagram (1) Indoor Unit (Cooling Only Models, & Heating Models).
Ser vice Manual 53 Schematic Diagram (2) Outdoor Unit(Cooling Only Models, & Heating Models).
54 Room Air Conditioner T roubleshooting Guide T r oubleshooting Guide Refrigeration Cycle Dia gram INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT HEAT EXCHANGE (EVAPORATOR) HEAT EXCHANGE (EVAPORAT.
Ser vice Manual 55 T roubleshooting Guide Piping Length and Elev ation Outdoor unit Indoor unit A B Outdoor unit Indoor unit A B A Oil trap Outdoor unit Indoor unit B If piping length is more than 16.4ft(5m) CA UTION: Capacity is based on standard length and maxim um allowance length is on the basis of reliability .
56 Room Air Conditioner T roubleshooting Guide Pumping Down 3-wa y V alve • Procedure (1) Confirm that both liquid side and gas side valves are set to the open position. – Remove the valve stem caps and confirm that the valve stems are in the raised position.
Ser vice Manual 57 T roubleshooting Guide 1) Re-air purging (Re-installation) • Procedure (1) Confirm that both the liquid side valve and the gas side valve are set to the closed position. (2) Connect the charge set and a gas cylinder to the service port of the Gas side valve.
58 Room Air Conditioner T roubleshooting Guide 2) Balance refrigerant of the 3-way v alve (Gas leakage) • Procedure (1) Confirm that both the liquid side and gas side valves are set to the back seat. (2) Connect the charge set to the 3-way valve ’ s port.
Ser vice Manual 59 T roubleshooting Guide 2. Ev acuation (All amount of refrigerant leaked) • 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 -76 cmHg (vacuum of 4 mmHg or less).
60 Room Air Conditioner T roubleshooting Guide 3. Gas Charging (After Evacuation) • Procedure (1) Connect the charge hose to the charging cylinder. – Connect the charge hose which you dis-con- nected from the vacuum pump to the valve at the bottom of the cylinder.
Ser vice Manual 61 T roubleshooting Guide Additional gas c harging (Gas leakage) • When refrigerant is insufficient by leakage, recharge the unit with the refrigerant up to normal operating suc- tion pressure. • Use the graph or the equation below to get operating suction pressure according to indoor and outdoor tem- perature.
62 Room Air Conditioner T roubleshooting Guide Cyc le P ar ts T roub le analysis 1. Check temperature difference between intake and discharge air and operating current. Temp. Difference Temp. difference : approx. 0 ˚ F(0 ° C) Current : less than 80% of rated current Temp.
Ser vice Manual 63 T roubleshooting Guide Electr onic P ar ts (9k model) Pr oduct does not operate at all. (* Refer to Electr onic Control De vice drawing and Sc hematic diagram.) Turn off Main Power Turn on Main Power Does "beeping" sound is made from the Indoor Unit? Primarily, the operating condition of Micom is OK.
64 Room Air Conditioner T roubleshooting Guide The pr oduct is not operate with the remote controller . 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.
Ser vice Manual 65 T roubleshooting Guide Compressor/Outdoor F an are unable to drive. Turn on Main Power Operate "Cooling Mode( )" by setting the desired temperature of the remote controller is less than one of the indoor temperature by 2 ° F at least.
66 Room Air Conditioner T roubleshooting 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 Indoor u.
Ser vice Manual 67 T roubleshooting Guide When V ertical Louver does not operate . • Confirm that the Vertical Louver is normally geared with the shaft of Stepping Motor.
68 Room Air Conditioner T roubleshooting Guide • The operation indicator of Indoor unit blinks five times. • The red indicator of Outdoor unit blinks five times. Check the connecting wires between Indoor and Outdoor unit for the connecting error and the contacting condition.
Ser vice Manual 69 T roubleshooting Guide The phenomena in case of connecting err or INDOOR UNIT Connector Type Condition Open and connecting error Open Open Open Open Short between terminals ( and ) of ROOM-TH. Short between terminals ( and ) of PIPE-TH.
70 Room Air Conditioner T roubleshooting Guide OUTDOOR UNIT Connector Type Condition OPEN • PWB pattern is damaged when applying the power. Connecting reversely Connecting reversely OPEN OPEN OPEN O.
Ser vice Manual 71 V oltage of Connectors accor ding to Indoor Fan Speed 1 2 3 4 1 3 4 1 2 3 4 5 INDOOR FAN MOTOR INDOOR PWB ASSY Connecting wires between Indoor and Outdoor Indoor Connecting Terminal.
72 Room Air Conditioner Exploded View Exploded Vie w 352150 35211B 354210 135515 131410 146811-1 135316 268711-1 152302 268711-4 135500-2 145200 146811-2 135500-1 266090 268711-3 249951 159830 330870 .
Ser vice Manual 73 Exploded View 550140 554160 567502 552113 437211 435301 447910 559010 546810 549610 554031 430410 552203-1 552203-2 437212 435511 649950 W0CZZ 567480-4 268711-6 552202 561410 552116 566000 567480-6 SUCTION 2.
74 Room Air Conditioner Replacement P ar ts List Replacement P ar ts List P ar ts List(Indoor) NOTE) * Please ensure GCSC since the replacement parts may be changed demending upon the buyer's request. Please check the correct parts in View RPL(Replacement Part List)on GCSC.
Ser vice Manual 75 Replacement P ar ts List P ar ts List(Outdoor) NOTE) * Please ensure GCSC since the replacement parts may be changed demending upon the buyer's request. Please check the correct parts in View RPL(Replacement Part List)on GCSC. (GCSC Website http://biz.
P/No.: 3828A20926C December, 2006 Printed in Korea.
An important point after buying a device LG Electronics LAN091CNP, LAU091CNP, LAN121CNP, LAU121CNP, LAN091HNP, LAU091HNP, LAN121HNP, LAU121HNP, LA090CPI, LA090CPO, LA120CPI (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
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If you already are a holder of LG Electronics LAN091CNP, LAU091CNP, LAN121CNP, LAU121CNP, LAN091HNP, LAU091HNP, LAN121HNP, LAU121HNP, LA090CPI, LA090CPO, LA120CPI, 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 LAN091CNP, LAU091CNP, LAN121CNP, LAU121CNP, LAN091HNP, LAU091HNP, LAN121HNP, LAU121HNP, LA090CPI, LA090CPO, LA120CPI.
However, one of the most important roles played by the user manual is to help in solving problems with LG Electronics LAN091CNP, LAU091CNP, LAN121CNP, LAU121CNP, LAN091HNP, LAU091HNP, LAN121HNP, LAU121HNP, LA090CPI, LA090CPO, LA120CPI. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device LG Electronics LAN091CNP, LAU091CNP, LAN121CNP, LAU121CNP, LAN091HNP, LAU091HNP, LAN121HNP, LAU121HNP, LA090CPI, LA090CPO, LA120CPI 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
