Room Air Conditioner SERVICE MANUAL MODEL : LSC183VMA
Contents Details of 2003 LG Model Name ............................................................................................ 3 Functions ................................................................................................................................ 4 Product References .............................................................................................................. 6 Dimensions ..............................................................................................
Details of 2003 LG Model Name 1 Code 2 - 3 Type 4 5 6 7 Code of Model 8 9 10 Meaning 1 Producing Center/ Refrigerant A~Z L: ChangWon R22, A: ChangWon R410A, C: ChangWon R407C 2 Type of Air conditioner A~Z S: Split Type Air conditioner 3 Cooling/Heating A~Z C: C/O, H: H/P, X: C/O + E/H, Z: H/P + E/H 4,5 Capacity(Btu/h) 1~9 Cooling/Heating Capacity Ex.
Functions Indoor Unit Operation ON/OFF by Remote controller Sensing the Room Temperature • Room temperature sensor. (THERMISTOR) Room temperature control • Maintains the room temperature in accordance with the Setting Temp. Starting Current Control • Indoor fan is delayed for 5 sec at the starting. Time Delay Safety Control • Restarting is inhibited for approx. 3 minutes.
Remote Control Operation ON/OFF Operation Mode Selection Cooling Operation Mode.( (Cooling (Heating model only) model only) ) Healthy Dehumidification Operation Mode.( Auto Operation Mode.( ) Heating Operation Mode.
Product References Items Unit Power Supply ø, V, Hz Cooling Capacity BTU/h Input W Running Current A COMP. Locked Rotor AMP. A E.E.
Dimensions (1) Indoor Unit 928 522 147 Pipe Hole Fix Hole MODEL DIM Indoor Unit Unit W mm(inch) 928(36.5) H mm(inch) 522(20.6) D mm(inch) 147(5.
(2) Outdoor Unit (18K) L1 L9 H L3 L2 D W L10 Gas side 3-way valve L4 Liquid side 3-way valve L6 L5 L7 L8 MODEL OUTDOOR UNIT DIM W mm(inch) 870(34.3) H mm(inch) 655(25.8) D mm(inch) 320(12.6) L1 mm(inch) 370(14.6) L2 mm(inch) 25(1.0) L3 mm(inch) 630(24.8) L4 mm(inch) 25(1.0) L5 mm(inch) 546(21.5) L6 mm(inch) 162(6.4) L7 mm(inch) 162(6.4) L8 mm(inch) 54(2.1) L9 mm(inch) 74.5(2.9) L10 mm(inch) 79(3.
Refrigeration Cycle Diagram • Cooling Only Models INDOOR UNIT OUTDOOR UNIT LIQUID SIDE CAPILLARY TUBE HEAT EXCHANGER (EVAPORATOR) HEAT EXCHANGER (CONDENSER) COMPRESSOR GAS SIDE Pipe size(Diameter:ø) Piping length Elevation MODEL 18K (Cooling Only) Gas Liquid Rated Max Rated Max 5/8" 1/4" 7.5m(24.6ft) 30m(98.4ft) 5m(16ft) 7m(23ft) For installation over rated, *a proper quantity of refrigerant should be added for each meter.
Wiring Diagram (1) Indoor Unit 18K (Cooling Only Models) (2) Outdoor Unit (18K) -10-
Operation Details 1. MAIN UNIT FUNCTION • DISPLAY 1) C/O Model Operation Indicator • ON while in appliance operation, OFF while in appliance pause. • Flashing while in disconnection or short in Thermistor. (3 sec off / 0.5 sec on) Sleep Timer Indicator • ON while in sleep timer mode, OFF when sleep timer cancel or appliance operation pause. Timer Indicator • ON while in timer mode (on/off), OFF when timer mode is completed or canceled. Comp.
• While in compressor off, the indoor fan repeats low airflow speed and pause. • While the intake air temp is between compressor on temp. and compressor off temp., 10-min dehumidification operation and 4-min compressor off repeat. Compressor ON Temp. ➲ Setting Temp+0.5°C Compressor OFF Temp. ➲ Setting Temp-0.5°C • In 10-min dehumidification operation, the indoor fan operates with the low airflow speed.
■ Fuzzy Operation (C/O Model) • According to the temperature set by Fuzzy rule, when the intake air temp is 0.5°C or more below the setting temp, the compressor is turned off. When 0.5°C or more above the setting temp, the compressor is turned on. Compressor ON Temp ➲ Setting Temp + 0.5°C Compressor OFF Temp ➲ Setting Temp + 0.5°C • At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the intake air temp at that time.
2) Fuzzy Operation for Dehumidification • According to the setting temperature selected by Fuzzy rule, when the intake air temp is 0.5°C or more below the setting temp, the compressor is turned off. When 0.5°C or more above the setting temp, the compressor is turned on. Compressor ON Temp ➲ Setting Temp + 0.5°C Compressor OFF Temp ➲ Setting Temp+0.5°C • At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the intake air temp at that time.
■ Off-Timer Operation • When the set time is reached after the time is input by the remote control, the appliance stops operating. • The timer LED is on when the off-timer is input. It is off when the time set by the timer is reached. • 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.
■ Jet Cool Mode Operation (H/P Model) • While in heating mode or Fuzzy operation, the Jet Cool key cannot be input. When it is input while in the other mode operation (cooling, dehumidification, ventilation), the Jet Cool mode is operated. • In the Jet Cool mode, the indoor fan is operated at super-high speed for 60 min at cooling mode operation. • In the Jet Cool mode operation, the room temperature is controlled to the setting temperature, 18°C.
Display Function 1. Heating Model 2.
Installation 1. Installation of indoor, Outdoor unit Read completely, then follow step by step. 1) Select the best location ■ Rooftop Installations: If the outdoor unit is installed on a roof structure, be sure to level the unit. Ensure the roof structure and anchoring method are adequate for the unit location. Consult local codes regarding rooftop mounting. 1. Indoor unit ■ Do not have any heat or steam near the unit. ■ Select a place where there are no obstacles in front of the unit.
3) Preparing work for Installation 1. Open panel front 2. Cover pipe and cover side remove ■ First,Pull the grille bottom, then remove screws(2 pieces), and close grille bottom again. ■ 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 ■ After pull down this panel a bit, and separate connecting wire with product.
4) How to fix installation plate 5) Preparing work for installation The wall you select should be strong and solid enough to prevent vibration 1. Drill a hole in the wall • Drill the piping hole with a ø50mm hole core drill. Drill the piping hole at either the right or the left with the hole slightly slanted to the outdoor side. A Mount the installation plate on the wall with type "A" screws. If mounting the unit on a concrete wall, use anchor bolts.
2. Flaring Work and Connection of Piping 1) Flaring work • Carry out flaring work using flaring tool as shown below. Bar Cone Copper pipe Clamp handle Red arrow mark 5. Check • Compare the flared work with figure below. • If flare is noted to be defective, cut off the flared section and re-flare it. Slanted Uneven Rough 90° Bar Yoke 1. Cut the pipes and the cable. • Use the piping kit accessory or pipes purchased locally. • Measure the distance between the indoor and the outdoor unit.
2. Tape the tubing, drain hose, and the connecting cable. Be sure that the drain hose is located at the lowest side of the bundle. Locating at the upper side can cause drain pan to overflow inside the unit. Outside diameter mm inch Ø6.35 1/4 Ø9.52 3.8 Ø12.7 1/2 Ø15.88 5/8 Ø19.05 3/4 • When extending the drain hose at the indoor unit, install the drain pipe. Loop Gas side piping Connecting cable Liquid side piping Torque kg.m 1.8 4.2 5.5 6.6 6.
3) Connection of the pipes-Outdoor CAUTION 1. Align the center of the pipings and sufficiently tighten the flare nut by hand. Installation Information (For right piping) • Good case For right piping. Follow the instruction below. ■ Press on the upper side of clamp and unfold the tubing to downward slowly. 2. 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.
3. Connecting The Cable Between Indoor Unit and Outdoor Unit 1) Connection of the cable 1. Remove the cover control from the unit by loosening the 3 screws. Wiring Diagram 2. Dismount caps on the conduit panel. Indoor Unit Terminal (4P) 3. Temporarily mount the conduit tubes on the conduit panel. 4. Properly connect both the power supply and low voltage lines to the corresponding terminals on the terminal block.
2) Connection method of the connecting cable(Example) (1) Dismount 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. (5) Fix the connection cable with clamp cord provided on the unit not to have strain at the terminal when the connection cable is pulled outside up to a 35 pound weight.
4. checking the Drainage and forming the pipings 1) Checking the drainage 2) Form the piping 1. To check the drainage. 1. Form the piping by wrapping the connecting portion of the indoor unit with insulation material and secure it with two kinds of vinyl tapes. ■ Pour a glass of water on the evaporator. ■ Ensure the water flows through the drain hose of the indoor unit without any leakage and goes out the drain exit.
CAUTION CAUTION If a power plug is not to be used, provide a circuit breaker between power source and the unit as shown below. Main power source Air Conditioner Circuit Breaker Use a circuit breaker or time delay fuse. 3) Connect the cable to the indoor unit 1. Connect the wires to the terminals on the control board individually according to the outdoor unit connection. • Ensure that the color of the wires of outdoor unit and the terminal No. are the same as those of indoor unit respectively.
5. Air Purging 1) Air purging • Do a leak test of all joints of the tubing(both indoor and outdoor) and both gas and liquid side service valves. Bubbles indicate a leak. Be sure to wipe off the soap with a clean cloth. • After the system is found to be free of leaks, relieve the nitrogen pressure by loosening the charge hose connector at the nitrogen cylinder. When the system pressure is reduced to normal, disconnect the hose from the cylinder.
Soap water method Gas side (1) Remove the caps from the 2-way and 3-way valves. (2) Remove the service-port cap from the 3-way valve. (3) To open the 2-way valve turn the valve stem counterclockwise approximately 90°, wait for about 2~3 sec, and close it. (4) Apply a soap water or a liquid neutral detergent on the indoor unit connection or outdoor unit connections by a soft brush to check for leakage of the connecting points of the piping. (5) If bubbles come out, the pipes have leakage.
6. Panel Front Assembly 1. First, Check the side cover assembly exactly, Fix power cord in the bottom groove of cover side left. 2. Assemble connecting lead wire with controller and first fix the upper part of panel front, then match the lower part of panel front Panel Front Connector 3. Drive three screws.
7. Test Running 1. Check that all tubing and wiring have been properly connected. 2. Check that the gas and liquid side service valves are fully open. Intake temperature Discharge air 1. Prepare remote control 1. Remove the battery cover by pulling it according to the arrow direction. 2. Insert new batteries making sure that the (+) and (–) of battery are installed correctly. 3. Reattach the cover by pushing it back into position. Discharge temperature 4.
Operation Name and Function-Remote Control The remote control transmits the signals to the system. Signal transmitter 5 1 START/STOP BUTTON Operation starts when this button is pressed and stops when the button is pressed again. 2 OPERATION MODE SELECTION BUTTON Used to select the operation mode. 3 ROOM TEMPERATURE SETTING BUTTONS Used to select the room temperature. 4 INDOOR FAN SPEED SELECTOR Used to select fan speed in four steps low, medium, high and CHAOS.
Disassembly of the parts (Indoor unit) Warning : Disconnect the unit from power supply before making any checks. Be sure the power switch is set to “OFF”. 1. To remove the Grille from the Chassis. - Push mark[ ] on the grille bottom then pull it down and remove 3 securing screws. - Lift the both lower parts of panel front. - After pull down this panel a bit, separate connecting wire with product. ∆ Panel Front Connector CN-DC/DC CN-UD CN-LR2 CN-TH1 2. To remove the Control Box.
3. To remove the Evaporator. - Remove 1 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. Top Cover Air Guide Pipe Cover 5. To remove the Motor. - Remove the securing bolt from the motor shaft. - Pull the fan out from the motor shaft. - Remove 4 screws securing motor mount from the chassis and lift up the motor mount and the bracket.
2-way, 3-way Valve 2-way Valve (Liquid Side) Hexagonal wrench (4mm) Flare nut 3-way Valve (Gas Side) Valve cap Open position Flare nut Closed position Open position Closed position To piping connection To piping connection To outdoor unit Works Shipping 1.
1. Air purging Required tools : hexagonal wrench, adjustable wrench, torque wrenches, wrench to hold the joints, and gas leak detector. The air in the indoor unit and in the piping must be purged. If air remains in the refrigeration pipes, it will affect the compressor, reduce to cooling capacity, and could lead to a malfunction. The additional gas for air purging has been charged in the outdoor unit.
2. Pumping down Liquid side Indoor unit 2-Way valve Open Outdoor unit Gas side Closed 3-Way valve Lo CLOSE CLOSE Purge the air • Procedure (6) Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 1kg/cm2g. (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.
1) Re-air purging (Re-installation) Liquid side Indoor unit 2-Way valve Closed Outdoor unit Gas side Closed 3-Way valve Gas cylinder Lo R22 OPEN CLOSE • Procedure (6) Disconnect the charge set and the gas cylinder, and set the 2-way and 3-way valves to the open position. – Be sure to use a hexagonal wrench to operate the valve stems. (1) Confirm that both the 2-way valve and the 3way valve are set to the closed position.
2) Balance refrigerant of the 2-way, 3-way valves (Gas leakage) Liquid side Indoor unit Outdoor unit 2-Way valve Open 3-Way valve Open Gas side Lo OPEN CLOSE • Procedure (3) Open the valve (Lo side) on the charge set and discharge the refrigerant until the gauge indicates 0 kg/cm2G. – If there is no air in the refrigerant cycle (the pressure when the air conditioner is not running is higher than 1 kg/cm2G), discharge the refrigerant until the gauge indicates 0.5 to 1 kg/cm2G.
3. Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit 2-Way valve Open Gas side 3-Way valve Open Vacuum pump Lo OPEN CLOSE • Procedure (4) Disconnect the charge hose from the vacuum pump. – Vacuum pump oil. If the vacuum pump oil becomes dir ty or depleted, replenish as needed. (1) Connect the vacuum pump to the charge set’s center hose (2) Evacuation for approximately one hour. – Confirm that the gauge needle has moved toward -76 cmHg (vacuum of 4 mmHg or less).
4. Gas Charging (After Evacuation) Liquid side Indoor unit 2-Way valve Open Outdoor unit Gas side Open 3-Way valve Check valve Charging cylinder Lo (1) OPEN CLOSE • Procedure \ (1) Connect the charge hose to the charging cylinder. – Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder. – If you are using a gas cylinder, also use a scale and revers the cylinder so that the system can be charged with liquid.
Cycle Troubleshooting Guide 1. Trouble analysis 1. Check temperature difference between intake and discharge air and operating current. Temp. difference :approx. 0°F Current :less than 80% of rated current All amount of refrigerant leaked out. Check refrigeration cycle. Temp. difference :approx. 8°C(14°F) Current :less than 80% of rated current Refrigerant leakage Clog of refrigeration cycle Defective compressor Temp.
2. Product does not operate at all. (* Refer to Electronic Control Device drawing and Schematic diagram.) Turn off Main Power (After 10 seconds) Turn on Main Power Does "beeping" sound is made from the Indoor Unit? YES NO Primarily, the operating condition of Micom is OK.
3. The product 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. When the compressor stopped Indoor Fan is driven by a low speed. At this point the wind speed is not controlled by the remote controller. (When operated in the Sleeping Mode, the wind speed is set to the low speed by force.
4. Compressor/Outdoor Fan 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. When in Fan Mode, Compressor/Outdoor Fan is stopped. Check the sensor for indoor temperature is attached as close as to be effected by the temperature of Heat Exchanger(EVA).
5. When Indoor Fan does not operate. Does the voltage of each terminals of CN-MOTOR CONNECTOR in Indoor unit corresponds to values in the Table of page 51? Does the voltage of terminal of CN-DC/DC CONNECTOR in Indoor unit corresponds to the values in the table of page 51? Do the voltage of terminal of CN-DC/DC CONNECTOR in Outdoor unit corresponds to the values in the table of page 51? NO Check the patterns and the conditions of outdoor unit PWB Assy's.
6. When Vertical Louver does not operate. • Confirm that the Vertical Louver is normally geared with the shaft of Stepping Motor. • If the regular torque is detected when rotating the Vertical Louver with Normal hands • Check the connecting condition of CN-U/D, CN-L/R Connector • Check the soldering condition(on PWB) of CN-U/D, CN-L/R Connector Check the operating circuit of the Vertical Louver • Confirm that there is DC +12V between pin (RED) of CN-U/D, CN-L/R and GND.
7. When a comunication error occurs. • 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. Check the installation condition of outdoor unit. Check for the communication error and the operating condition of product after also operating with the remote controller, then taking above 2 minutes.
8. The phenomena in case of connecting error INDOOR UNIT Connector Type CN-DC/DC Phenomena Condition Open and connecting error • The same as the phenomenon of Outdoor Unit. Blue Black Brown Red CN-MOTOR Open • The indoor fan does not operate. • The operation indicator of Indoor unit blinks 8 times. Open • The up/down vane does not operate. CN-UD Short between terminals CN-D1/D2 Open • The up/down vane does not smoothly operate. • It does not operate with a remote controller.
OUTDOOR UNIT Connector Type Phenomena Condition OPEN CN-POWER Connecting reversely • All functions stop. • The operation with the remote controller, forced and test one do not operate. • PWB pattern is damaged when applying the power. OPEN • All functions stop or the compressor does not operate. • The operation with the remote controller, forced and test one do not operate. Connecting reversely • All functions stop. • The operation with the remote controller, forced and test one do not operate.
BL BK BR RD 1 2 3 4 INDOOR FAN MOTOR - 51 - OUTDOO R CN-DC/DC INDOOR CN-DC/DC INDOOR CN-MOTOR CONNELTORS MODELS INDOOR PWB ASSY 2 2 4 2 1 3 2 4 2 1 2 2 4 3 2 2 1 3 - + No. of pins Indoor Connecting Terminal 32.3 17.0 0~12 32.0 17.0 0~12 0~5 5.0 32.0 S-Hi 18K RY-COMP 3 4 28.1 17.0 0~12 27.8 17.0 0~12 0~5 5.0 27.8 Hi 24.4 17.0 0~12 24.1 17.0 0~12 0~5 5.0 24.1 Med 21.3 17.0 0~12 21.2 17.0 0~12 0~5 5.0 21.
Electronic Control Device (1) MAIN PWB ASSY(Indoor Unit) • TOP VIEW • BOTTOM VIEW • PWB ASSY SVC PART LIST OPTIONAL FUNCTION NO 1 MODEL 18K Cooling Model P/No.
(2) MAIN PWB ASSY(Outdoor Unit) • PWB ASSY SVC PART LIST OPTIONAL FUNCTION NO MODEL P/No. OR4H OR5H OR6H OR7H OR 8H FUSE 1 18K Cooling Model 6871A10036P 27K 39K 91K 27K - 53 - 12K 250V 3.
(3) DISPLAY PWB ASSEMBLY • TOP VIEW • BOTTOM VIEW (4) SUB P.W.
Schematic Diagram 1.
- 56 - 1 2 3 4 1 2 3 4 CN-DC/DC 3 2 8 C92 104 50V D92 1N4148 R92 2.7K DC 5V DC 5V DC 5V VR71 220 R75 23.2K 34K 1.06K 5.23K 56 R95 7 20K 14 3K 3 4 2 1 R74 2K 1% 4 29.4K 102 + 8 - D91 1N4148 ZD81 5.1V R81 XXX 1% - 3 + + C73 100uF 25V 5.1K 13K 5 + R73 13K 1% 22 390 R93 C91 103 21.5K C06 103 O 5V R64 10K - + I C67 473K 100V C03 470uF 25V 7805 IC3 5 L63 L64 R72 11K 1% + C04 103 O 12V Q62 2SD2220 DC 5V OR5 XXX 1% R25 12.
Exploded View and Replacement Parts List 1.
Parts List(indoor) LOCATION No. 131410 PART No.
437210 435512 -59430411 447910 559010 546810 550140 554160 567502 261704 554031 W0CZZ 668711 552111 561410 552116 649950 552203-3 552203-2 435511 437212 2.
Parts List(outdoor) LOCATION No. PART No.
MEMO -61-
MEMO -62-
P/No.
