Related Manuals for LG LV-B2420CL
Summary of Contents for LG LV-B2420CL
- Page 1 Room Air Conditioner (Convertible Type) SERVICE MANUAL MODEL: LV-B2420CL/ B2420HL LV-B2421CL/ B2421HL LV-B1820CL/ B1820HL LV-B1821CL/ B1821HL...
- Page 2 Contents Functions ..........................3 Product Specifications (Cooling Only)..................5 Product Specifications (Cooling & Heating).................6 Dimensions ..........................7 Refrigeration Cycle Diagram ....................9 Wiring Diagram........................11 Operation Details ........................13 Display Function ........................21 Self-diagnosis Function......................21 Installation ..........................22 Operation ..........................39 Disassembly of the parts (Indoor Unit) ................41 2-way, 3-way Valve.........................45 Cycle Troubleshooting Guide....................51 Electronic Parts Troubleshooting Guide................52 Electronic control device......................56...
- Page 3 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 seconds at the starting. Time Delay Safety Control •...
- Page 4 Remote Controller Operation ON/OFF Operation Mode Selection Cooling Operation Mode.( Auto Operation Mode.( (Cooling (Heating Soft Dry Operation Mode.( Heating Operation Mode.( model only) model only) Fan Speed Selection (Low) (Med) (High) (CHAOS) Room Temperature Display : High:39°C LOW:11°C Temperature Setting Down to 18°C Down to 16°C TEMPERATURE...
- Page 5 Product Specifications (Cooling Only) Model Name LV-B1820CL LV-B1821CL LV-B2420CL LV-B2421CL Item Unit Cooling Capacity Btu/h(kcal/h) 18,000(4,536) 24,000(6,048) Moisture Removal Power Source ø, V, Hz 1ø 220, 60Hz Indoor 13.5 Air Circulation /min Outdoor Input 2,000 1,950 2,750 2,700 Running Current E.E.R.
- Page 6 Product Specifications (Cooling & Heating) Model Name LV-B1820HL LV-B1821HL LV-B2420HL LV-B2421HL Item Unit Cooling Capacity Btu/h(kcal/h) 18,000(4,536) 24,000(6,048) Heating Capacity Btu/h(kcal/h) 18,000(4,536) 24,000(6,048) Moisture Removal Power Source ø, V, Hz 1ø, 220, 60Hz Indoor 13.5 Air Circulation /min Outdoor Input Cooling 1,950 1,750...
- Page 7 Dimensions (1) Indoor Unit 1 2 0 0 m m 205mm 63mm 38mm 175mm (Installation Plate) 250mm (Rear Side) –7–...
- Page 8 (2) Outdoor Unit Gas side 3-way valve Liquid side 3-way valve MODEL LV-B1820CL/HL, LV-B1821CL/HL, LV-B2420CL/HL, LV-B2421CL/HL 74.5 –8–...
- Page 9 Refrigeration Cycle Diagram • LV-B1820CL • LV-B1821CL • LV-B2420CL • LV-B2421CL INDOOR UNIT OUTDOOR UNIT LIQUID SIDE CAPILLARY TUBE HEAT HEAT EXCHANGER EXCHANGER (EVAPORATOR) (CONDENSER) COMPRESSOR GAS SIDE Pipe size(Diameter: ) Piping length(m) Elevation(m) MODEL Liquid Rated Rated LV-B1820CL 1/2"...
- Page 10 • LV-B1820HL • LV-B1821HL • LV-B2420HL • LV-B2421HL INDOOR UNIT OUTDOOR UNIT LIQUID SIDE CAPILLARY TUBE CHECK VALVE CAPILLARY TUBE HEAT HEAT EXCHANGER EXCHANGER GAS SIDE REVERSING VALVE COOLING COMPRESSOR HEATING Pipe size(Diameter: ) Piping length(m) Elevation(m) MODEL Liquid Rated Rated LV-B1820HL 1/2"...
- Page 11 Wiring Diagram (1) Indoor Unit 1. LV-B1820CL/1821CL/2420CL/2421CL TRANS- THERMISTOR FORMER CAPACITOR CN-TRANS CN-TH BR YL CN-FAN MAIN PCB RY-L ASSY. MOTOR RY-M GN/YL RY-H DOOR S/W 1 GN/YL STEP MOTOR FUSE T3.15A STEP RY-COMP MOTOR CN-4WAY CN-DISP GN/YL TERM NAL 1 ( L ) 2 ( N ) DISPLAY PCB BLOCK...
- Page 12 (2) Outdoor Unit 1. LV-B1820CL/1821CL/2420CL/2421CL COMP. CAPACITOR MOTOR TERMINAL BLOCK TO INDOOR UNIT CONVERTIBLE(COOLING ONLY) (OUTDOOR) 2. LV-B1820HL/2420HL 3. LV-B1821HL/2421HL CAPACITOR CAPACITOR CAPACITOR COMP. COMP. MOTOR MOTOR REVERSING THERMISTOR COIL GN/YL GN/YL REVERSING VALVE DEICE ASSY. L3 L2 L1 GN/YL GN/YL TERMINAL TERMINAL...
- Page 13 Operation Details (1) The function of main control 1. Time Delay Safety Control • 3min … The compressor is ceased for 3minutes to balance the pressure in the refrigeration cycle. (Protection of compressor) • 5sec … Vertical air flow direction control louvers open in 5 seconds to prevent noise between louvers and wind. •...
- Page 14 3. Cooling Mode Operation • When selecting the Cooling( ) Mode Operation, the unit will operate according to the setting by the remote con- troller and the operation diagram is as following Intake Air temp. COMP. ON (SET TEMP.+0.5°C) COMP. OFF (SET TEMP.
- Page 15 5. Auto Operation • The operation procedure is as following. (Cooling & Heating Model) Press Start/Stop Button Select Auto Operation Mode Check the Room temperature Operation mode Indoor fan speed are automatically decided by Fuzzy rule. Setting temperature Intake-air below Over below 21°C Over 24°C...
- Page 16 • Auto Operation for Soft Dry The Setting temperature will be same as that of the current intake-air temperature. - Compressor ON temperature; Setting temperature +1°C - Compressor OFF temperature; Setting temperature -0.5°C • Auto Operation for Heating. Intake Air temp. below 20°C over 20 ~below 21°C Setting temp.
- Page 17 6. Natural wind by CHAOS logic For more fresh feeling than other fan speed mode, press the indoor fan Speed Selector and set to CHAOS mode. In this mode, the wind blows like natural breeze by auto- matically changing fan speed according to the CHAOS logic.
- Page 18 7. Heating Mode Operation The unit will operate according to the setting by the remote controller and the operation diagram is shown as following. • For Heating Model Indoor piping temp. 28°C 26°C Intake Air temp. Setting temp. +3.0˚C (Compressor OFF) Setting temp.
- Page 19 9. Deice Control • Deicing operation is controlled by timer and sensing the outdoor piping temperature. • The first deicing starts only when the outdoor pipe temperature falls below -6°C after 45(30) minutes passed from starting of heating operation. • Deicing ends after 10(6) minutes passed from starting of deice operation or when the outdoor pipe temperature rises over 12°C even if before 10(6) minutes.
- Page 20 11. Forced operation • If you lose wireless remote controller, you can operate the unit with forced operation switch. • The standard conditions are as following. Heat pump Model Cooling Model Room Temp 24°C 21°C Room Temp 24°C Room Temp 21°C Operation Mode Cooling Cooling...
- Page 21 Display Function 1. Heating Model 2. Cooling Model Operation Indicator Operation Indicator • Coolling, Soft Dry, Fan, Heating • Coolling, Soft Dry, Fan, Heating Timer Indicator Timer Indicator • Timer Mode • Timer Mode Sleep Timer Indicator Sleep Timer Indicator •...
- Page 22 Installation 1. Installation of Indoor, Outdoor Unit 1. Selection of the best location More than 20cm 1) Indoor unit More than 20cm • There should not be any heat source or steam near the unit. • There should not be any obstacles to prevent the air More than eye-level circulation.
- Page 23 2. Indoor unit installation ■ Before Installing, prepare Installation Plates • 'Installation Plates' are attached at the bottom of Side Plate indoor unit. Detach them by removing each 3 screws at both sides. • Detach 'Side Plate (R,L)' by removing each 2 screws on both sides.
- Page 24 • Insert the nuts and washer onto the suspension bolts Anchor nut for locking the suspension bolts on the ceiling. Ceiling • Mount the suspension bolts to the anchor-nuts firmly. • Secure the Installation plates onto the Suspension Washer bolts (adjust level roughly.) using nuts, washers and Suspension bolts spring washers.
- Page 25 CAUTION 1. Install declination of the indoor unit is very important for the drain of the convertible type air conditioner. 2. Minimum thickness of the insulation for the connecting pipe shall be 7mm. 3. If the Installation Plates are fixed to horizontal line, the indoor unit after installing will be declined to the bottomside.
- Page 26 • Secure the unit to the Installation Plates with four M8 bolts and washers. • Before working, refer to "Connecting pipe and cable to Indoor Unit" on page 32. • Hook up the Inlet Grille Hook to the cabinet. Inlet hanger •...
- Page 27 2) Installation on the Wall • Select and mark the position for fixing bolts and piping hole. Decide the position for fixing bolts slightly tilted to the drain direction after considering the direction of drain hose. • Drill the hole for anchor nut on the wall. •...
- Page 28 Install the Indoor unit onto Installation Plate. • Insert 2 hooks on the both left and right side of the unit Inner slot to the inner slot (wall side) of the Installation Plate. • Secure the unit to the Installation Plate with four M8 bolts and washers.
- Page 29 3) Installation on the floor From the left wall Installation of Mount Bracket. more than 760mm • Select and mark the position for Mount Brackets and the piping hole. • Drill the hole for the anchor nut on the wall. From the right wall •...
- Page 30 3. Connecting Pipes to the Indoor Unit 3-1. Preparation of Piping Main cause of gas leakage is defect in flaring work. Copper Carry out correct flaring work in the following proce- Slanted Uneven Rough tube 90° dure. 1) Cut the pipes and the cable. ■...
- Page 31 3-2. Installation on the ceiling 1) Connecting the pipes to the indoor unit The pipe can be connected to right side, bottom or back of the unit. 1. For the Right Side Piping • After bending an end of the connecting tube, align the center of the pipings and sufficiently tighten the flare Hose nut with fingers.
- Page 32 3-3. Installation on the wall or floor 1) Connecting the pipes to the indoor unit 1. For the Right Rear Piping • Remove the knock-out at the back side of the cabinet. Piping • After bending an end of the connecting tube, align the center of the pipings and sufficiently tighten the flare Taping nut with fingers.
- Page 33 4. Connecting Pipes to the Outdoor Unit 1) Connecting the pipes to the Outdoor unit 1. Align the center of the pipings and sufficiently tighten the flare nut with fingers. 2. Finally, tighten the flare nut with torque wrench until the wrench clicks. •...
- Page 34 6. Connecting Cables between Indoor Unit and Outdoor Unit 1) Connecting cables to the Indoor Unit 1) Remove the Air guide - L by loosening 2 screws after removing the Inlet grille from the Indoor unit. 2) Connect the wires to the terminals on the con- trol board individually according to the outdoor AIR GUIDE-L unit connection.
- Page 35 3) Connecting the cable to Outdoor Unit Outdoor unit 1. Remove the Cover control from the unit by loosening Terminal block a screw. Connect the wires to the terminals on the control Over 5mm board individually as following. Holder for 2.
- Page 36 4) Form the pipings Seal a small opening 1. Wrap the connecting portion of indoor unit with around the pipings the Insulation material and secure it with two with gum type sealer. Plastic Bands. (for the right pipings) • If you want to connect an additional drain hose, the end of the drain-outlet should keep distance from the Taping ground.
- Page 37 7. Air Purging of the Pipes and Indoor Unit The air which contains moisture remaining in the refrigeration cycle may cause a malfunction on the compressor. 1. Confirm that both the liquid side valve and the gas side valve are set to the closed position. 2.
- Page 38 8. Test running 1) Connection of power supply 1. Connect the power supply cord to the inde- pendent power supply. • Circuit breaker is required. 2. Prepare the remote control. • Insert two batteries provided. Remove the battery cover from the remote con- troller.
- Page 39 Operation (1) Name and Function-Remote controller 1) Cooling Model OPERATION DISPLAY Remote Controller Displays the operation conditions. START/STOP BUTTON Signal transmitter. Operation starts when this button is pressed and stops when the button is pressed again. Transmits the signals to the room air conditioner. OPERATION MODE SELECTION BUTTON Used to select the operation mode.
- Page 40 2) Heat Pump Model Remote Controller OPERATION DISPLAY Displays the operation conditions. Signal transmitter. START/STOP BUTTON Transmits the signals Operation starts when this button is pressed and stops to the room air conditioner. when the button is pressed again. OPERATION MODE SELECTION BUTTON Used to select the operation mode.
- Page 41 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. Remove the air filter. • Pull the inlet grille slightly toward you. •...
- Page 42 4. Remove air guide upper, crossflow fan and motor. • Remove the screws of both sides and center securing the upper air-guide. • Remove 2 screws fastening the bracket of door switch. Door Switch • Remove a bearing assembly by removing a screw and the bearing cover.
- Page 43 6. Remove the front panel. Diffuser frame • Remove the screws of both sides fixing the front Diffuser panel. frame • Push the upper side of front panel strongly to pull Hook out the front panel from the inner hook of diffuser frame.
- Page 44 9. Remove the vane-upper, vane-lower and step motor. Step Motor • Remove 2 screws securing the step motor Vane Supporter assembly and pull it out from the vanes carefully. • Unhook the vanes from the vane supporter and remove the upper vane and lower vane by pulling the center of vanes with care.
- Page 45 2-way, 3-way Valve 2-way Valve (Liquid Side) 3-way Valve (Gas Side or Liquid Side) Valve cap Hexagonal wrench (4mm) Open position Flare nut Flare nut Closed position Open position Closed position piping piping Service Service connection connection port cap port To outdoor unit To outdoor unit Works...
- Page 46 1. Pumping down Liquid side Indoor unit Outdoor unit Open 2-Way valve Gas side Closed 3-Way valve CLOSE CLOSE Purge the air • Procedure (6) Operate the air conditioner in cooling mode (1) Confirm that both liquid side and gas side and stop it when the gaug e indicates valves are set to the open position.
- Page 47 1) Re-air purging (Re-installation) Liquid side Indoor unit Closed Outdoor unit 2-Way valve Gas side Closed 3-Way valve Gas cylinder OPEN CLOSE • Procedure (6) Disconnect the charge set and the gas (1) Confirm that both the liquid side valve and the cylinder, and set the 2-way and 3-way valves gas side valve are set to the closed position.
- Page 48 2) Balance refrigerant of the 2-way, 3-way valves (Gas leakage) Liquid side Indoor unit Outdoor unit 2-Way valve Open Gas side 3-Way valve Open OPEN CLOSE • Procedure (1) Confirm that both the liquid side and gas side (3) Open the valve (Lo side) on the charge set valves are set to the back seat.
- Page 49 2. Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit 2-Way valve Open Gas side 3-Way valve Open Vacuum pump OPEN CLOSE • Procedure (1) Connect the vacuum pump to the center hose (3) Close the valve (Lo side) on the charge set, of charge set center hose turn off the vacuum pump, and confirm that the gauge needle does not move (approxima-...
- Page 50 3. Gas Charging (After Evacuation) Liquid side Indoor unit Open Outdoor unit 2-Way valve Gas side Open 3-Way valve Check valve Charging cylinder OPEN CLOSE • Procedure (1) Connect the charge hose to the charging This is different from previous procedures. cylinder.
- Page 51 Cycle Troubleshooting Guide Trouble analysis 1. Check temperature difference between intake and discharge air and operating current. Temp. difference : approx. 0°C All amount of refrigerant leaked out Current : less than 80% of Check refrigeration cycle rated current Temp. Difference Refrigerant leakege Temp.
- Page 52 Electronic Parts Troubleshooting Guide Possible Trouble 1 : The unit does not operate. Is the input voltage Check the FUSE of transformer AC220V? and the wiring diagram Check the RY-COMP PIN 3 and CN-4WAY PIN 1 Is the output voltage Is shorted the Check the main P.C.B of transformer about AC14V?
- Page 53 Possible Trouble 2 : The indoor fan does not operate. Does the temperature Adjust set temperature Is it DRY mode? set all right? Is it the HOT Does the temperature Adjust set temperature mode? set all right? Is IC02M operated Exchange IC02M normally? Is the each S.S.R...
- Page 54 Possible Trouble 3 : Up/Down Air direction louver does not operate. Is IC01M operated Exchange IC01M normally? Is the PIN 1 of Check the main P.C.B CN-UP/DOWN DC12V? DC12V pattern Check the step motor and connector (CN-UP/DOWN 1,2) Possible Trouble 4 : Remote controller does not operate.
- Page 55 Possible Trouble 5 : Ineffective Heating Check RY-4WAY Is 4way-valve operated? Is IC02M operated Exchange IC02M normally? Check the RY-4WAY and 4way-valve Possible Trouble 6 : The unit does not operate by forced operation switch. Is the F/OP key Exchange F/OP key any problem? Check P.C.B pattern check –55–...
- Page 56 Electronic control device (1) MAIN P.C.B ASM (2) DISPLAY P.C.B ASM –56–...
- Page 57 Schematic Diagram –57–...
- Page 58 Exploded View and Replacement Parts List 1. Indoor Unit –58–...
- Page 59 Parts List (Cooling Only Models) PART No. LOCATION DESCRIPTION REMARK LV-B1820CL LV-B2420CL LV-B1821CL LV-B2421CL 130911 CABINET ASSY 3091AP2533A 3091AP2533A 135314 GRILLE ASSY,INLET 5237AP2817C 5237AP2817C 137213 PANEL ASSY,SIDE 3720AP2767P 3720AP2767P 146811 MOTOR ASSY, STEP 4681AR2727G 4681AR2727G 152302 FILTER(MECH), A/C 5230AP7093A 5230AP7093A...
- Page 60 Parts List (Heat Pump Models) PART No. LOCATION DESCRIPTION REMARK LV-B1820HL LV-B2420HL LV-B1821HL LV-B2421HL 130911 CABINET ASSY 3091AP2533A 3091AP2533A 135314 GRILLE ASSY,INLET 5237AP2817C 5237AP2817C 137213 PANEL ASSY,SIDE 3720AP2767P 3720AP2767P 146811 MOTOR ASSY, STEP 4681AR2727G 4681AR2727G 152302 FILTER(MECH), A/C 5230AP7093A 5230AP7093A 159901-1 VANE ASSY,HORIZONTAL 5991AP2867B...
- Page 61 2. Outdoor Unit –61–...
- Page 62 Parts List (Cooling Only Models) PART No. LOCATION DESCRIPTION REMARK LV-B1820CL LV-B2420CL LV-B1821CL LV-B2421CL 430410 BASE ASSY,OUTDOOR 2H02182F 3041A30003K 3041A30003F 3041A30003K 435511 COVER ASSY,CONTROL(OUTDOOR) 2H02082P 3551A30007K 3551A30007K 435512 COVER ASSY,TOP(OUTDOOR) 3H03465E 3H03266J 3H03266K 437210 PANEL ASSY,FRONT SUB 2H02674G 1A00196M 3721A20004G...
- Page 63 Parts List (Heat Pump Models) PART No. LOCATION DESCRIPTION REMARK LV-B1820HL LV-B2420HL LV-B1821HL LV-B2421HL 263230 THERMISTOR ASSY 3Q35015B 3Q35015B 268711 PWB(PCB) ASSY 6871AQ3164C 430410 BASE ASSY, WELD[OUTDOOR] 3041A30003K 3041A30003F 3041A30003K 435511 COVER ASSY, CONTROL(OUTDOOR) 3551A30007L 3A01919B 435512 COVER ASSY, TOP(OUTDOOR) 3H03266J 3H03266K 437210...
- Page 64 February, 2001 P/No.: 3828A30027K Printed in Korea...