Table of Contents
Troubleshooting
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Summary of Contents for LG LT-E1820CL
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Page 1: Service Manual
Ceiling Cassette Air Conditioner SERVICE MANUAL MODELS: LT-E1820CL/LT-E1820HL LT-E1860CL/LT-E1860HL LT-E1860AA LT-E1862HL LT-E2460CL/LT-E2460HL LT-E2460BL LT-E2462HL/LT-E2462CL LT-E2460AA LT-C182ELE0/LT-H182ELE0 LT-H246ELE0/ELF0 LT-C246ELE0/ELF0... -
Page 2: Table Of Contents
Contents Functions ..........................3 Product Specifications (Cooling & Heating) ................7 Dimensions ..........................9 Refrigeration Cycle Diagram ....................12 Wiring Diagram ........................14 Operation Details ........................17 Installation of Indoor, Outdoor Unit ..................20 Cycle ............................38 Cycle Troubleshooting Guide ....................41 Electronic Parts Troubleshooting Guide ................42 Electronic Control Device .....................45 Schematic Digram ........................46 Exploded View and Replacement Parts List ...............47 –2–... -
Page 3: Functions
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. • Indoor fan is delayed for 5 seconds at the starting. Starting Current Control Time Delay Safety Control •... -
Page 4: Remote Controller
Remote Controller Operation ON/OFF Operation Mode Selection Cooling Operation Mode ( Soft Dry Operation Mode ( Heating Operation Mode ( Auto Operation Mode ( (Cooling (Heating model only) model only) Fan Speed Selection AUTO (Low) (Med) (High) Room Temperature Display : High:39°C LOW:11°C Temperature Setting... - Page 5 ELEVATION GRILL (REMOTE CONTROLLER_Accessory) • Main Components of Lift Grill Signal transmitter Lift grill front panel assembly Bolts for installation (4 EA, P/No. 3A00255K) Instruction manual Ascend Remote Controller for lift grill Descend Stop • How to Use Remote Controller As for operation of Remote Controller, use it by directing the trans- mitter part of Remote Controller to the receiver part of front panel directly under front panel.
- Page 6 • How to Operate the Lift Grill • Always stop the air conditioner operation for safety before operating lift grill. • Take heed _ there is worry about dust fall etc. when suction grill descends. • In case when the set automatic stop distance goes wrong, check the set value of operation panel and con- firm if there is neither obstacle nor mankind.
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Page 7: Product Specifications (Cooling & Heating)
Product Specifications (Cooling & Heating) LT-E1820CL LT-E1820HL Model LT-E2460AA LT-E1860CL LT-E1860HL LT-E1862HL LT-C182ELE0 LT-H182ELE0 1, 220-240, 50 1, 220-240, 50 1, 220-240, 50 1, 220-240, 50 1, 220, 60 1, 220, 60 Power Supply ø, V, Hz 4,536(5,274) 4,536(5,274) 4,536(5,274) - Page 8 LT-E2460CL LT-E2462HL LT-E2462CL Model LT-E2460HL LT-E2460BL LT-C246ELE0 LT-H246ELE0/ELF0 LT-E2460AA Power Supply ø, V, Hz 1, 220-240, 50 1, 220-240, 50 1, 220-240, 50 1, 220-240, 50 1, 220-240, 50 5,871(6,827) 5,871(6,827) 5,871(6,827) 5,871(6,827) 5,871(6,827) Capacity Cooling kcal/h(W) Btu/h 23,300 23,300 23,300 23,300 23,300...
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Page 9: Dimensions
Dimensions (1) Indoor Unit CLOSE OPEN OPEN CLOSE –9–... - Page 10 LT-H***ELE0 LT-H***FLE0 LT-H***DLE0 (unit : mm) Model LT-H***ELE0 LT-H***FLE0 LT-H***DLE0 Unit –10–...
- Page 11 (2) Outdoor Unit Gas side 3-way valve Liquid side 3-way valve MODEL All Models 74.5 –11–...
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Page 12: Refrigeration Cycle Diagram
Refrigeration Cycle Diagram • HEAT PUMP INDOOR UNIT OUTDOOR UNIT CAPI A ACCUM. H/EX VALVE REVERSING Liquid Side Liquid Side Gas Side H/EX CAPI C1 Heating Cooring CAPI C2 COMPRESSOR Liquid Side Gas Side Gas Side CAPI B * Additional Pipe Size Length (m) Elevation (m) -
Page 13: Cooling Only
• COOLING ONLY INDOOR UNIT OUTDOOR UNIT CAPI A H/EX COMPRESSOR Gas Side Gas Side Gas Side ACCUM. H/EX CAPI C1 CAPI C2 Liquid Side Liquid Side Liquid Side CAPI B * Additional Pipe Size Elevation (m) Length (m) refrigerant Capacity (g/m) Max. -
Page 14: Wiring Diagram
Wiring Diagram • HEAT PUMP Model No.: LT-E1860HL/ LT-E1862HL/ LT-E2460HL/ LT-E2462HL/ LT-E2460BL LT-H182ELEO/LT-H246ELE0/LT-H246ELF0 OUTDOOR WIRING DIAGRAM INDOOR WIRING DIAGRAM CAPACITOR COMP MOTOR INDOOR DRAIN STEP MOTOR PUMP MOTOR POWER FUSE T3.15A RELAY REVERSING PIPE THERMISTOR VALVE GN/YL FLOAT S/W REMOTE CN - DISP CONTROL TERMINAL... - Page 15 • COOLING ONLY Model No.: LT-E1860CL/LT-E1860AA/LT-C182ELE0 OUTDOOR WIRING DIAGRAM INDOOR WIRING DIAGRAM CAPACITOR COMP MOTOR INDOOR DRAIN STEP MOTOR PUMP MOTOR POWER FUSE T3.15A RELAY PIPE THERMISTOR GN/YL FLOAT S/W REMOTE CN - DISP CONTROL TERMINAL TERMINAL DISPLAY PCB BLOCK BLOCK POWER TO INDOOR UNIT...
- Page 16 ELEVATION GRILL WIRING DIAGRAM (INDOOR) LT-H***DLE0/LT-C***DLE0 LT-H***ELE0/LT-C***ELE0 LT-H***FLE0/LT-C***FLE0 –16–...
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Page 17: Operation Details
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 18: Heating Mode Operation
6. Heating Mode Operation The unit will operate according to the setting by the remote controller and the operation diagram is shown as follows. Intake Air temp. minimum 3min Setting temp.+3°C (Compressor OFF) Setting temp. (Compressor ON) minimum minimum minimum 1min 10sec. - Page 19 8. Defrost Control (18k, 24k) • 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. • Defrost control is available 45 min. later since heating mode operation started, and it will not prolong over 10 min. •...
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Page 20: Installation Of Indoor, Outdoor Unit
Installation of Indoor, Outdoor Unit 1. Selection of the best location 1) Indoor unit • There should not be any heat source or steam near the unit. • There should not be any obstacles to the air cir- culation. • A place where air circulation in the room will be Ceiling Ceiling Board good. -
Page 21: Ceiling Opening Dimensions And Hanging Bolt Location
2. Ceiling opening dimensions and hanging bolt location • The dimensions of cardboard for installing are the 600 (Ceiling opening) same as those of the ceiling opening dimensions. 521(Hanging bolt) 39.5 39.5 Ceiling Level gauge 570 Unit size CAUTION • This air-conditioner uses a drain pump. •... -
Page 22: The Indoor Unit Installation
3. The Indoor Unit Installation Ceiling Keep the length of the bolt Hanging bolt from the bracket to 40mm (W3/8 or M10) Flat washer for M10 Air Conditioner body (W3/8 or M10) (accessory) Ceiling board Ceiling board Spring washer (M10) Flat washer for M10 (accessory) Cardboard... -
Page 23: Wired Remote Control Installation
WIRED REMOTE CONTROL INSTALLATION DISASSEMBLING • Separate the under plate from Remote control box. Front case Lever carefully Remote control the box open box body using a screw • Fix the cord clamps on the wall by ø 3 tapping driver, etc. -
Page 24: Wiring Connection
5. Wiring Connection • Open the control box cover and connect the Remote controller cord and Indoor power wires. Indoor power cord Control box cover Remote [Air inlet side view] controller cord Control box cover fitting screw(2 units) Terminal Block of Indoor Unit Terminal Block of Outdoor Unit •... -
Page 25: Electrical Wiring
ELECTRICAL WIRING 1. All wiring must comply with LOCAL REGULATIONS. 2. Select a power source that is capable of supplying the current required by the air conditioner. 3. Feed the power source to the unit via a distribution switch board designed for this purpose. 4. -
Page 26: Connecting Pipes To The Indoor Unit
6. Connecting Pipes to the Indoor Unit • Preparation of Piping Main cause of gas leakage is defect in flaring work. Carry out correct flaring work in the following procedure. 1) Cutting the pipes and the cable. Use the accessory piping kit or the pipes purchased Copper locally. - Page 27 Piping Connection 1. Form the piping according to its routing. Avoid bend- ing and bending back the same piping point more Liquid side than three times. (This will result in hardening of pipe.) Indoor 2. After deforming the piping, align centers of the union unit fitting of the indoor unit and the piping, and tighten Outdoor...
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Page 28: Installation Of Decoration Panel
7. Installation of Decoration Panel Before installing the decoration panel, The decoration panel has its installation always remove the paper template. direction. 1. Temporarily fix two decoration panel fixing screws (hexagon M5 screw) on the unit body. (Tighten by amount 10mm in length.) The fixing screws (hexagon M5 screw) are included the indoor unit box. - Page 29 8. Installation of Decoration Panel(Elevation Grille) Before installing the decoration panel, The decoration panel has its installation always remove the paper template. direction. 1. Temporarily fix two decoration panel fixing screws (hexagon M5 screw) on the unit body. (Tighten by amount 10mm in length.) The fixing screws (hexagon M5 screw) are included unit box.
- Page 30 • Don't lay any material upon suction grill. • Suction grill comprises 2 strands of wire. If any substance is placed on it then balance may be destroyed so that the substance would drop down and cause a breakage or damage. Also the matter may cause trouble owing to which the grill would not be correctly inserted at front panel.
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Page 31: Indoor Unit Drain Piping
9. Indoor Unit Drain Piping Upward Pipe clamp routing • Drain piping must have down-slope (1/50 to 1/100): be sure not allowed not to provide up-and-down slope to prevent reversal flow. Indoor unit • During drain piping connection, be careful not to exert extra force on the drain port on the indoor unit. -
Page 32: Heat Insulation
HEAT INSULATION 1. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over 120°C). Fastening band 2. Precautions in high humidity circumstance: (accessory) This air conditioner has been tested according to the "KS Standard Conditions with Mist" and confirmed that there is not any default. -
Page 33: Test Running
Seal a small opening In case of the Outdoor Unit being installed around the pipings above position of the Indoor Unit. with gum type sealer. Trap 2. Tape the Pipings and Connecting cable from bot- tom to top. 3. Form the pipings gathered by taping along the exterior wall, and make the trap prevent water from entering into the room. - Page 34 2) Connection of power supply 1. Connect the power supply cord to the independent power supply. • Circuit breaker is required. 2. Operate the unit for fifteen minutes or more. 3) Evaluation of the performance 1. Measure the temperature of the intake and dis- charge air.
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Page 35: Optional Operation
Optional Operation 1) Two Thermistor System (1) Open the rear cover of the wired remote-controller to set the mode. (2) Select one of three selectable modes as follows. • Position 1: The room temperature is controlled by the thermistor of the main body. •... -
Page 36: Outdoor Wiring Diagram
2) Adjusting air volume to the height of ceiling You can choose the RPM(or air volume) of indoor motor according to the height of ceiling to supply the com- fortable atmosphere to consumers. Procedure 1. Choose the selectable position in the table after measuring the height of ceiling. Ceiling height Mode of slide switch Change of air volume... - Page 37 3) Group Control(Optional Wiring) It operates maximum 16 Units by only one Wired Remote Controller, and each Unit starts sequentially to prevent overcurrent. Main PCB Indoor Unit 1 Indoor Unit 2 Indoor Unit 16 Terminal(Local Supply) Terminal(Local Supply) Terminal(Local Supply) Block Block Block...
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Page 38: Cycle
Cycle 1. Installation (Connecting the piping between indoor and outdoor unit) Liquid side Indoor unit Outdoor unit 3-Way valve Gas side 3-Way valve Gas cylinder Purge the air • Installation (1) Connect the piping between the indoor and out- (5) If there is no leakage, discharge N in piping com- door unit firmly. - Page 39 2. Disconnection (on moving) Liquid side Indoor unit Closed Outdoor unit 2-Way valve Gas side Closed 3-Way valve Retrieving Tank • Disconnection (1) Attach the charging hose (manifold gage) to (6) Disconnect the piping between indoor and the service port. outdoor unit and then put on service cap to –...
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Page 40: Gas Charging
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 This is different from previous procedures. (1) Connect the charge hose to the charging Because you are charging with liquid refrigerant cylinder. -
Page 41: Cycle Troubleshooting Guide
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 42: Electronic Parts Troubleshooting Guide
Electronic Parts Troubleshooting Guide Possible Trouble 1 : The unit does not operate. Check the FUSE Is the input voltage and the wiring diagram. AC230V? Is the input voltage Check the main P.C.B of IC03D about DC12V? pattern. Is the output voltage Exchange IC03D. - Page 43 Possible Trouble 2 : The indoor fan does not operate. Is it the HOT It is normal operation. START mode? Is IC01M operated Exchange IC01M. normally? Is the each Relay Exchange Relay. any problem? Check the fan motor and connector.(CN-MOTOR) Possible Trouble 3 : Ineffective Heating Adjust operation mode.
- Page 44 Possible Trouble 4 : Auto Air direction louver does not operate. Is IC01M operated Exchange IC01M. normally? Check the motor and connector. (CN-LOUVER) : Wired remote controller does not operate. Possible Trouble 5 Check the parts of Is the LCD operated communication.
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Page 45: Electronic Control Device
Electronic control device MAIN P.C.B ASM –45–... -
Page 46: Schematic Digram
Schematic Digram R05T R04T R03T R02T R01T R06T –46–... -
Page 47: Exploded View And Replacement Parts List
Exploded View and Replacement Parts List 1. Indoor Unit 266090 249951 268714 159830 354212 35211A 352118 263230 158591 266012 330870 –47–... - Page 48 130411 W0CZZ 346810 359011 146811 268712 140570 152302 135802 135312-2 135312-1 130911 352150 267110 267110 352150 –48–...
- Page 49 Elevation Grille 137211 W4811-1 146812-1 W4811-2 146812-2 668713 249951 750830 268712 266011-2 146811 146811 266011-2 152312 267110 435310 –49–...
- Page 50 • Indoor Unit Parts List Model: LT-E1860HL/ LT-E1862HL/LT-E2460HL/ LT-E2460BL PART NO. LOCATION DESCRIPTION MARK LT-E1860HL LT-E1862HL LT-E2460HL LT-E2460BL 35211A TUBE ASSY, SUCTION 5211A20243A 5211A20243A 5211A20243B 5211A20243B 352118 TUBE ASSY, MANIFOLD 5211A20241F 5211A20241F 5211A20241F 5211A20241F 266012 SWITCH ASSY, FLOAT 6601A20001F 6601A20001F 6601A20001F 6601A20001F 330870...
- Page 51 • Indoor Unit Parts List Model: LT-E1820HL/ LT-E2462HL/ LT-H246ELE0/ LT-H246ELF0 PART NO. LOCATION DESCRIPTION REMARK LT-E1820HL LT-E2462HL LT-H246ELE0 LT-H246ELF0 354212 EVAPORATOR ASSY 5421A10007B 5421A10007B 35211A TUBE ASSY, SUCTION 5211A20243B 5211A20243B 5211A20243B 5211A20243B 352118 TUBE ASSY, MANIFOLD 5211A20241F 5211A20241F 5211A20241F 5211A20241F 158591 PUMP, WATER 5859A20001M...
- Page 52 • Indoor Unit Parts List Model: LT-E1860CL/ LT-E1860AA/ LT-E2460CL/LT-E1820CL PART NO. LOCATION DESCRIPTION REMARK LT-E1860CL LT-E1860AA LT-E2460CL LT-E1820CL 354212 EVAPORATOR ASSY 5421A10007A 5421A10007A 5421A10007A 35211A TUBE ASSY, SUCTION 5211A20243A 5211A20243A 5211A20243B 5211A20243A 352118 TUBE ASSY, MANIFOLD 5211A20241A 5211A20241F 5211A20241F 5211A20241A...
- Page 53 • Indoor Unit Parts List Model: LT-C182ELE0/LT-E182ELE0/LT-E2462CL/LT-C246ELE0 PART NO. LOCATION DESCRIPTION REMARK LT-C182ELE0 LT-H182ELE0 LT-E2462CL LT-C246ELE0 354212 EVAPORATOR ASSY 5421A10007A 5421A10007A 5421A10007B 5421A10007B 35211A TUBE ASSY, SUCTION 5211A20243A 5211A20243A 5211A20243B 5211A20243B 352118 TUBE ASSY, MANIFOLD 5211A20241F 5211A20241F 5211A20241F 5211A20241F 158591 PUMP, WATER 5859A20001M 5858A10001M...
- Page 54 • Indoor Unit Parts List Model: LT-C246ELF0 PART NO. LOCATION DESCRIPTION REMARK LT-C246ELF0 130411 BASE ASSEMBLY,WELD[INDOOR] 3041A10013A 130911 CABINET ASSEMBLY,INDOOR 3091A10023C 130911 CABINET ASSEMBLY,INDOOR 3091A10023D 135312-1 PANEL ASSEMBLY,FRONT(INDOOR) 3721A10105D 135312-2 GRILLE,INLET 3530A10065A 135802 DOOR 3580A20005A 140570 LOCKER 4056A20001A 146811 MOTOR ASSEMBLY,STEP 4681A20055A 152312 FILTER ASSEMBLY,AIR CLEANER 5231A10005A...
- Page 55 • Elevation Grille_Accessory Part No. LOCATION DESCRIPTION CODE LT-H***ELE0 LT-H***FLE0 LT-H***DLE0 137211 PANEL ASSEMBLY,FRONT(INDOOR) 3721A10105E 3721A10072K 3721A10106J 146811 MOTOR ASSEMBLY, STEP 4681A20055A 4681A20055A 4681A20055A 435310 GRILLE ASSEMBLY, INLET 3531A10350A 3531A10211A 3531A10066M 152312 FILTER ASSEMBLY, AIR CLEANER 5231A10005A 5231A10012A 5231A10004A W4811-1 BRACKET ASSEMBLY 4811A20073A 4811A20072A 4811A20068A...
- Page 56 2. Outdoor Unit –56–...
- Page 57 • Outdoor Unit Parts List Model: LT-E1860CL/AA/LT-E1820CL/LT-C182ELE0/LT-E2460CL/LT-E2462CL/LT-E2460AA LT-C246ELE0 PART NO. LOCATION REMARK DESCRIPTION LT-E1820CL LT-E2460AA LT-E1860CL LT-E1860AA LT-E2460CL LT-E2462CL LT-C182ELE0 LT-C246ELE0 430410 BASE ASSY, WELD(OUTDOOR) 3041A30003U 3041A20022G 3041A20022E 3041A30003E 3041A20022E 3041A20022E 435512 COVER ASSY, TOP(OUTDOOR) 3H03266N 3H03266N 3H03266K 3H03266N 3H03266K...
- Page 58 • Outdoor Unit Parts List Model: LT-C246ELF0 PART NO. LOCATION DESCRIPTION REMARK LT-C246ELF0 135301 GRILLE,DISCHARGE 3530A20007B 349480 ORIFICE 4948A20005A 430410 BASE ASSEMBLY,WELD[OUTDOOR] 3041A20022E 435511 COVER ASSEMBLY,CONTROL(OUTDOOR) 3A01919B 435512 COVER ASSEMBLY,TOP(OUTDOOR) 3H03266K 437210 PANEL ASSEMBLY,FRONT(OUTDOOR) 3721A20005Z 437212 PANEL ASSEMBLY,REAR(OUTDOOR) 3720AP0003L 447910 BARRIER ASSEMBLY,OUTDOOR 2H02110M 546810 MOTOR ASSEMBLY,OUTDOOR 4681A20013K...
- Page 59 • Outdoor Unit Parts List Model: LT-E1860HL/ LT-E1862HL/ LT-E1820HL/LT-H182ELE0/LT-E2460HL/ LT-E2460BL/ LT-E2462HL/ LT-H246ELE0/ LT-H246ELF0 Part No. LOCATION LT-E2462HL DESCRIPTION REMARKS LT-E1860HL LT-E1862HL LT-E2460BL LT-E2460HL LT-H246ELE0 LT-E1820HL LT-H182ELE0 LT-H246ELF0 430410 BASE ASSY, WELD(OUTDOOR) 3041A20022G 3041A20022G 3041A20022E 3041A20022E 3041A20022E 3041A30003F 3041A30003F 435512 COVER ASSY, TOP(OUTDOOR) 3H03266N 3H03266N 3H03266K...
- Page 60 August, 2005 Printed in Korea P/No.: 3828A20048D...
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