Related Manuals for LG SJ242CD
Summary of Contents for LG SJ242CD
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Page 1: Room Air Conditioner
WEBSITE http://biz.LGservice.com Room Air Conditioner SERVICE MANUAL CAUTION -BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. -ONLY FOR AUTHORIZED SERVICE PERSONNEL. -
Page 2: Table Of Contents
Contents Functions ..........................Product References ......................Dimensions ..........................9 Refrigeration Cycle Diagram ....................11 Wiring Diagram........................12 Operation Details ......................... 14 Display Function ........................21 Installation ..........................22 Operation ..........................33 Disassembly of the parts (Indoor Unit) ................34 2-way, 3-way Valve........................ 36 Cycle Troubleshooting Guide.................... -
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. Starting Current Control • Indoor fan is delayed for 5 sec at the starting. Time Delay Safety Control •... -
Page 4: Refrigeration Cycle Diagram
Refrigeration Cycle Diagram (1) Cooling Only Models INDOOR UNIT OUTDOOR UNIT LIQUID SIDE CAPILLARY TUBE HEAT HEAT EXCHANGE EXCHANGE (EVAPORATOR) (CONDENSER) GAS SIDE COMPRESSOR (2) Cooling & Heating Models INDOOR UNIT OUTDOOR UNIT CHECK VALVE LIQUID SIDE (Heating Model only) VALVE CAPILLARY TUBE HEAT... -
Page 5: Operation Details
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 •... -
Page 6: Heating Mode Operation
• While in compressor off, the indoor fan repeats low airflow speed and pause. • While the intak e air temp is betw een compressor on temp . and compressor off temp ., 10-min dehumidifica- tion operation and 4-min compressor off repeat. Compressor ON Temp. - Page 7 Fuzzy Operation (C/O Model) • According to the temper ature set by Fuzzy r ule, when the intak e air temp is 0.5 °C or more belo w 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...
- Page 8 2) Fuzzy Operation for Dehumidification • According to the setting temper ature selected by Fuzzy rule, when the intake air temp is 0.5 °C or more below the setting temp, the compressor is tur ned off. When 0.5 °C or more abo ve the setting temp , the compressor is turned on.
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Page 9: Sleep Timer Operation
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. •... -
Page 10: Forced Operation
■ Forced Operation • Operation procedures when the remote control can't be used. • The operation will be started if the power button is pressed. • If you want to stop operation, re-press the button. Heat pump Model Cooling Model Room Temp. - Page 11 Remote Control Operation Mode • When the remote control is selected b y the slide switch on the main unit, the appliance oper ates according to the input by the remote control. Protection of the evaporator pipe from frosting • If the indoor pipe temp is belo w 0°C in 7 min. after the compressor oper ates without any pause while in cool- ing cycle oper ation mode, the compressor and the outdoor f an are tur ned off in order to protect the indoor evaporator pipe from frosting.
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Page 12: Display Function
Display Function 1. Heating Model 2. Cooling Model Operation Indicator Operation Indicator • Cooling, Soft Dry, Fan, Heating • Cooling, Soft Dry, Fan Sleep Timer Indicator Sleep Timer Indicator • Sleep Mode • Sleep Mode Timer Indicator Timer Indicator • Timer Mode •... -
Page 13: Installation
Installation 1. Installation of indoor, Outdoor unit 1) Selection of the best location • Select a place so that the warm air and noise from the air conditioner do not disturb neighbors. 1. Indoor unit • Do not have any heat or steam near the unit. More than 10 cm •... - Page 14 3) Drill a hole in the wall • Drill the piping hole with a ø70mm hole core drill. Drill the piping hole at either the right or the left with the hole slightly slanted to the outdoor side. WALL Indoor Outdoor -14-...
- Page 15 2. Flaring Work and Connection of Piping 1) Flaring work 4. Flaring work • Firmly hold copper pipe in a die in the dimension Main cause for refrigerant leakage is due to defect in shown in the table above. the flaring work. Carry out correct flaring work using the following procedure.
- Page 16 2) Connection of piping Indoor 3. Tape the tubing, drain hose, and the connecting cable. Be sure that the drain hose is located at the • Preparing the indoor unit's piping and drain hose for lowest side of the bundle. Locating at the upper installation through the wall.
- Page 17 • Tighten the flare nut with a wrench. • Wrap the area which accommodates the rear piping housing section with vinyl tape. Open-end wrench (fixed) Indoor Connection unit pipe pipe Flare nut Vinyl tape Wrap with vinyl tape (wide) Connection pipe Wrench Connecting cable Indoor unit tubing...
- Page 18 3. Insert the connecting cable into the indoor unit. Outside diameter Torque • Don't connect the cable to the indoor unit. kg . m inch • Make a small loop with the cable for easy connection Ø6.35 later. Ø9.52 Ø12.7 4.
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Page 19: Connection Of The Pipes-Outdoor
3) Connection of the pipes-Outdoor • Bundle the piping and drain hose together by wrap- ping them with cloth tape over the range within which they fit into the rear piping housing section. 1. Align the center of the pipings and sufficiently tighten the flare nut by hand. - Page 20 3. Connecting The Cable Between Indoor Unit and Outdoor Unit 1) Connect the cable to the Indoor unit. • Connect the cable to the indoor unit by connecting the wires to the terminals on the control board in dividually according to the outdoor unit connection. (Ensure that the color of the wires of the outdoor unit and the terminal No.
- Page 21 2) Connect the cable to the outdoor unit 1. Remove the control cover from the unit by loos- ening the screw. Connect the wires to the terminals on the control board individually. 2. Secure the cable onto the control board with the cord clamp.
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Page 22: Checking The Drainage And Forming The Pipings
4. Checking the Drainage and Forming the Pipings 1) Checking the drainage 2) Form the piping 1. To remove the front panel from the indoor unit. 1. Form the piping by wrapping the connecting por- • Set the air direction louvers up-and-down to the posi- tion of the indoor unit with insulation material and tion(horizontally) by hand. -
Page 23: Operation
5. Test Running 1. Check that all tubing and wiring have been properly connected. Intake temperature 2. Check that the gas and liquid side service valves are fully open. Discharge air 1. Prepare remote control 1. Remove the battery cover by pulling it according to the arrow direction. -
Page 24: Disassembly Of The Parts (Indoor Unit)
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”. To remove the Grille from the Chassis. • Set the up-and-down air discharge louver to open position (horizontally) by finger pressure. - Page 25 2. To remove the Control Box. • Remove securing screws. • Pull the control box out from the chassis careful- 3. To remove the Discharge Grille. • Unhook the discharge g rille and pull the dis - charge grille out from the chassis carefully. 4.
- Page 26 • 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. To remove the Motor Cover • Remove 2 securing screw. •...
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Page 27: 2-Way, 3-Way Valve
2-way, 3-way Valve 2-way Valve (Liquid Side) 3-way Valve (Gas 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 Shaft position... -
Page 28: Air Purging
1. Air purging Required tools : hexagonal wrench, adjustab le The air in the indoor unit and in the piping m ust be wrench, torque wrenches, wrench to purged. If air remains in the refr igeration pipes, it will hold the joints , and gas leak detec- affect the compressor, reduce to cooling capacity, and tor. -
Page 29: Pumping Down
2. 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 at the cooling (1) Confirm that both the 2-way and 3-way valves cycle and stop it when the gauge indicates are set to the open position. - Page 30 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 cylin- (1) Confirm that both the 2-way valve and the 3- der, and set the 2-way and 3-way valves to the way valve are set to the closed position.
- Page 31 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 (3) Open the valve (Lo side) on the charge set and discharge the refrigerant until the gauge (1) Confirm that both the 2-way and 3-way valves indicates 0 kg/cm are set to the back seat.
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Page 32: Vacuum Pump
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 OPEN CLOSE • Procedure (4) Disconnect the charge hose from the vacuum pump. (1) Connect the vacuum pump to the charge set’s –... -
Page 33: 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 Current : less than 80% of out. Check refrigeration cycle. rated current Temp. -
Page 34: Gas Charging
4. 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 35: Electronic Parts Troubleshooting Guide
Electronic Parts Troubleshooting Guide 1. 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? Primarily, the operating condition of Micom is OK. - Page 36 2. The product is not operate with the remote control. 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.
- Page 37 3. 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 1°C at least. When in Air Circulation 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).
- Page 38 4. When indoor Fan does not operate. Turn off Main power Check the connection of CN-MOTOR Check the Fan Motor Check the Fuse(AC250V/T2A) Check the related circuit of indoor Fan Motor. • The pin NO 58 of Micom, and the part for driving TRIAC(the input and output signal of IC01M, PIN NO 7, 10) •...
- Page 39 5. 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 hands Normal • Check the connecting condition of CN-U/D Connector •...
- Page 40 6. When Heating does not operate Turn ON Main Power Operate “Heating Mode( )” by setting the desired temperature of the remote control is higher than one of the indoor temperature by 2°C at least. In heating Mode, the indoor fan operates in case the pipe temperature is higher than 28°C.
- Page 41 Turn off Main Power • Check the electrical wiring diagram of outdoor side. • Check the abnormal condition for the component of Compressor/Out- door Fan Motor, 4 way. • Check the "open" or "short" of connecting wires between indoor and outdoor.
- Page 42 Exploded View Exploded View 1. Indoor Unit 135316 135301 152302 135314 135511 131410 733010 342800 359011 135311 354210 147581 352115 346810 35211B 147582-2 268711A 135516 268711D 147582-1 249941 W6640 146811 264110 263230 W0CZZ 267110 249951 6 Room Air Conditioner 146811...