Multi Type Air Conditioner SERVICE MANUAL MODEL: L2-C362LL0 L3-C362LL0 L3-C482LL0 CAUTION • BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. • ONLY FOR AUTHORIZED SERVICE PERSONNEL.
Safety Precautions Safety Precautions To prevent injury to the user or other people and property damage, the following instructions must be followed. Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications. WARNING This symbol indicates the possibility of death or serious injury.
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Safety Precautions Do not modify or extend the Do not install, remove, or re- Be cautious when unpacking power cable. install the unit by yourself and installing the product. (customer). • There is risk of fire or electric shock. • There is risk of fire, electric shock, •...
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Safety Precautions Do not store or use flammable gas or com- If strange sounds, or smell or smoke comes bustibles near the product. from product. Turn the breaker off or discon- nect the power supply cable. • There is risk of fire or failure of product. •...
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Safety Precautions CAUTION Installation check for gas (refrigerant) Install the drain hose to Keep level even when leakage after installation or ensure that water is drained installing the product. repair of product. away properly. • Low refrigerant levels may cause fail- •...
Product Specifications Product Specifications 1. L2-C362LL0 Operation A or B unit A + B unit Unit Item Cooling Capacity Btu/h(kcal/h) 17,800(4,486) 35,600(8,972) Moisture Removal 2.0 x 2 Power Source ø, V, Hz 1Ø, 220, 60HZ Indoor 13.1 Air Circulation /min...
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Product Specifications 2. L3-C362LL0 Operation A-Unit B or C-Unit A+B or C A+B+C Unit Item 12,000(3,024) 13,000(3,276) 25,000(6,300) 23,800(5,998) 35,800(9,022) Cooling Capacity Btu/h(kcal/h) Moisture Removal Power Source ø, V, Hz 1Ø, 220V, 60Hz Indoor 9.0 + 9.5 9 + 9 9.0 x 3 Air Circulation /min...
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Product Specifications 3. L3-C482LL0 Operation A-Unit B or C-Unit A+B or C A+B+C Unit Item 24,000(6,048) 16,000(4,032) 40,000(10,080) 24,000(6,048) 48,000(12,096) Cooling Capacity Btu/h(kcal/h) Moisture Removal Power Source ø, V, Hz 1Ø, 220V, 60Hz Indoor 14.5 14.5 + 9.0 8.2 + 8.2 14.5 + 8.2 + 8.2 Air Circulation /min Outdoor...
Wiring Diagram Wiring Diagram Indoor Unit Model: L2-C362LL0 Model: L3-C362LL0, L3-C482LL0 FORCED FORCED MAIN PCB MAIN PCB OPERATION OPERATION AUTO AUTO RESTART RESTART TRIAC REMOTE REMOTE CONTROL CONTROL MOTOR MOTOR OPTION THERMISTOR THERMISTOR STEP SH-CAPA. SH-CAPA. MOTOR STEP MOTOR H.V.B...
Electronic Control Device Electronic Control Device Indoor Unit • MAIN P.C.B ASM(L3-C362LL0, L3-C482LL0) • MAIN P.C.B ASM(L2-C362LL0) Service Manual 17...
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Electronic Control Device Outdoor Unit • MAIN P.C.B ASM(L3-C362LL0, L3-C482LL0) 18 Multi Air Conditioner...
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Electronic Control Device Display P.C.B ASM Service Manual 19...
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 seconds at the starting. Time Delay Safety Control •...
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Functions Remote Controller Operation ON/OFF Operation Mode Selection Cooling Operation Mode.( Auto Operation Mode.( (Cooling (Heating Healthy Dehumidification 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 HIGH TEMPERATURE...
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Display Function Display Function 1. Heating Model 2. Cooling Model Operation Indicator Operation Indicator • Cooling, Soft Dry, Fan • Cooling, Soft Dry, Fan, Heating Sleep Timer Indicator Sleep Timer Indicator • Sleep Mode • Sleep Mode Timer Indicator Timer Indicator •...
Operation Details Operation Details Main Unit Function 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 •...
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Operation Details • 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 dehumidifica- tion operation and 4-min compressor off repeat. Compressor ON Temp.
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Operation Details 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...
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Operation Details 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.
Operation Details 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. •...
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Operation Details Auto Restarting Operation • When the power is restored after a sudden power failure while in appliance operation, the mode before the power failure is kept on the memory and the appliance automatically operates in the mode on the memory. •...
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Operation Details Remote Control Operation Mode • When the remote control is selected by the slide switch on the main unit, the appliance operates according to the input by the remote control. Protection of the evaporator pipe from frosting • If the indoor pipe temp is below 0°C in 7 min. after the compressor operates without any pause while in cool- ing cycle operation mode, the compressor and the outdoor fan are turned off in order to protect the indoor evaporator pipe from frosting.
2-way, 3-way Valve 2-way, 3-way Valve 2-way Valve (Liguid Side) 3-way Valve (Gas Side) Valve cap Hexagonal wrench Open position (4mm) Closed position Flare nut Flare nut Open position Closed position piping piping Service Service connection connection port cap port To outdoor unit To outdoor unit Works...
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2-way, 3-way Valve (1) Pumping down Liquid side Indoor unit Outdoor unit Close 2-Way valve Gas side Open 3-Way valve manifold gauge Low-handle Hi- handle (CLOSE) (CLOSE) Procedure • 6. Operate the air conditioner at the cooling cycle 1. Confirm that both the gas side and liquid side and stop it when the gauge indicates 1kg/cm valves are set to the open position.
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2-way, 3-way Valve (2) Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit Close 2-Way valve Gas side Open 3-Way valve manifold gauge Vacuum pump Low- handle Hi- handle (OPEN) (CLOSE) • Procedure 7. Disconnect the charge hose from the vacuum 1.
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2-way, 3-way Valve (3) Gas Charging (After Evacuation) Liquid side Indoor unit Outdoor unit Close 2-Way valve Gas side Open 3-Way valve manifold gauge Charging cylinder Low-handle Hi- handle (OPEN) Check valve (CLOSE) • Procedure 1. Connect the gauge to the charging cylinder. 4.
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.
Electronic Parts Troubleshooting Guide Electronic Parts Troubleshooting Guide 1. The Outdoor Unit 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.
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Electronic Parts Troubleshooting Guide 2. 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.
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Electronic Parts Troubleshooting Guide 3. When cooling does not operate 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).
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Electronic Parts Troubleshooting Guide 4. When indoor Fan does not operate.(or "ON/OFF" led of display blinks 8 times) Turn off Main power Check the connection of CN-FAN or CN-MOTOR Check the Fan Motor Check the Fuse(AC250V/T2A) Check the related circuit of indoor Fan Motor. •...
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Electronic Parts Troubleshooting Guide 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 •...
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Electronic Parts Troubleshooting Guide 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.
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Electronic Parts Troubleshooting Guide 7. Outdoor unit does not operate at all. Check Outdoor Unit PCB Board Operation Check in Outdoor Content Remedy Items • Power Transformer - About AC220V/240V ± 10% - Check the power voltage (Outdoor unit) • Replace Trans - About AC14 ±...
Installation Installation (1) Installation of Indoor, Outdoor unit 1) Selection of the best location Front 1. Indoor unit There should not be any heat source or steam • Left near the unit. • There should not be any obstacles to prevent Rear left the air circulation.
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Installation 2) Indoor Unit Installation The mounting wall should be strong and solid enough to protect it from the vibration. Installation Plate 1. Mount the installation plate on the wall with four Type "A" screws. (If mounting the unit on the concrete wall, consid- er using anchor bolts.) marking-off line Type "A"...
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Installation (2) Piping and Drainage of Indoor Unit 1) Preparation of pipings Pipe cutter 1. Cut the pipes and the cable. • Use the accessory piping kit or the pipes pur- chased locally. Slanted Rough • Measure the distance between the indoor and the outdoor unit.
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Installation 2) Connection of Pipings Installation plate 1. Remove the installation plate • Pull the two '∆' marked portion of bottom of the chassis and pull the installation plate out of chas- sis. Pull 2. Route the drain hose and the indoor tubing. Pull For left rear piping 3.
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Installation 6. Indoor unit installation. • Hook the indoor unit onto the upper position of the installation plate. (Engage the two hooks of the rear top of the indoor unit with the upper Connecting edge of the installation plate.) cable Ensure the hooks are properly seated on the installation plate by moving it in left and right.
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Installation 9. Set the pipings and the connecting cable to the back of the chassis with the tubing holder. • Hook the edge of tubing holder to tap on chas- sis and push the bottom of tubing holder to be engaged in the bottom of chassis.
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Installation (3) Connecting Pipings and the cable to Outdoor unit 1) Connecting the pipings 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.
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(Rubber insulation, type H05RN-F approved by HAR specifications (Rubber insulation, type H07RN-F or SAA). approved by HAR or SAA). CAPACITY NORMAL CROSS- NORMAL CROSS- (Btu/h) SECTION AREA Models SECTION AREA ~24K 2.5mm L2-C362LL0 1.5mm ~36K 3.5mm Others 0.75mm ~48K 5.5mm Service Manual 53...
Installation 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 Circuit Breaker Conditioner Use a circuit breaker or time delay fuse. Connect the cable to the indoor unit 1.
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Installation (5) Form the piping (4) Checking the drainage 1. To remove the front panel from the indoor unit, 1. Form the piping by wrapping the connecting por- remove the front panel from the indoor unit cabinet. tion of the indoor unit with insulation material and Set the air direction louvers up-and-down to the posi- secure it with two kinds of vinyl tapes.
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Installation (6) Air Purging of the Pipings and indoor unit The air which contains moisture remaining in the is 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.
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Installation (7) Maximum Length of Pipe and Freon Extra Charge Charge amount per 1m CONNECTION TYPE Capacity STANDARD Charge am't(g) (Btu/h) LENGTH(m) per 1m ~7000 ~9000 ~12000 ~18000 ~24000 B(Length) INDOOR UNIT A(Height) OUTDOOR UNIT C(Height) INDOOR UNIT D(Length) ** A, B mean indoor unit higher located than outdoor unit. C, D mean outdoor unit higher located than indoor unit.
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Installation (8) Test running 1) Connection of power supply 1. Connect the power supply cord to the inde- Battery Cover pendent power supply. 2. Prepare the remote control. • Insert two batteries provided. Remove the battery cover from the remote con- troller.
Operation Operation (1) Name and Function-Remote Control (Cooling Model) REMOTE CONTROL Remote Controller ON/OFF TIMER BUTTONS Used to set the time of starting and stopping operation. Signal transmitter. TIME SETTING BUTTONS Transmits the signals Used to adjust the time. to the room air conditioner. TIMER SET/CANCEL BUTTONS Signal transmitter Used to set the timer when the desired time is obtained...
Operation (2) Name and Function-Remote Control (Heat Pump Models) Remote Controller ON/OFF TIMER BUTTONS Signal transmitter. Used to set the time of starting and stopping operation. Transmits the signals TIME SETTING BUTTONS to the room air conditioner. Used to adjust the time. Signal transmitter TIMER SET/CANCEL BUTTONS Used to set the timer when the desired time is obtained...
Disassembly of the parts (Indoor unit) Disassembly of the parts (Indoor unit) Warning : Disconnect the unit from power supply before mak- ing any checks. Be sure the power switch is set to “OFF”. To remove the Grille from the Chassis. •...
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Disassembly of the parts (Indoor unit) 2. To remove the Control Box. • Remove securing screws. • Pull the control box out from the chassis care- fully. 3. To remove the Discharge Grille. • Pull the discharge grille out from the chassis carefully.
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