website http://www.lgservice.com LG LG Room Air Conditioner SERVICE MANUAL MODELS: AS-W096URH0/UBH0/UWH0/UMH0 AS-W126URH0/UBH0/UWH0/UMH0/UCH0 AS-W096URH1/UBH1/UWH1/UMH1 AS-W126URH1/UBH1/UWH1/UMH1 CAUTION • BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. • ONLY FOR AUTHORIZED SERVICE PERSONNEL.
Air Conditioner Service Manual TABLE OF CONTENTS LG Model Name ...............................................................................................................................................3 Safety Precautions..........................................................................................................................................5 Dimensions ......................................................................................................................................
LG Model Name 2002 1 Code 2 - 3 Type 4 5 6 7 Code of Model 8 9 Meaning 1,2 Type of Airconditioner A~Z LS: LG Split Type Airconditioner 3 Chassis A~Z 4,5 Capacity(Btu/h) 1~9 Name of toll of Unit Ex. LS-R ➔ S R Chassis Cooling/Heating Capacity Ex. "09" ➔ 9,000Btu/h 6 Electric Range 1~9 7 Serial No.
2003~2005 1 Code 2 - 3 Type 4 5 6 Code of Model 7 8 9 10 Meaning 1 Producing Center, Refrigerant A~Z L: Chang-won R22 A: Chang-won R410A C: Chang-won R407C T: China K: Turkey R22 E: Turkey R410A H: Thailand 2 Product Type A~Z S: Split Type Air Conditioner 3 Cooling/Heating/Inverter A~Z C: Cooling only H: Heat pump X: C/O + E/Heater Z: H/P + E/Heater 4, 5 Capacity 0~9 Cooling/Heating Capacity Ex.
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. This symbol indicates the possibility of death or serious injury. This symbol indicates the possibility of injury or damage to properties only. ■ Meanings of symbols used in this manual are as shown below.
Safety Precautions For re-installation of the installed product, always contact a dealer or an authorized service center. • There is risk of fire, electric shock, explosion, or injury. Be cautious when unpacking and installing the product. • Sharp edges could cause injury. Be especially careful of the case edges and the fins on the condenser and evaporator. Do not install the product on a defective installation stand. • It may cause injury, accident, or damage to the product.
Safety Precautions ■ Operation Do not turn the air-conditioner ON or OFF by plugging or unplugging the power plug. • There is risk of fire or electrical shock. Grasp the plug to remove the cord from the outlet. Do not touch it with wet hands. • There is risk of fire or electrical shock. Do not allow water to run into electrical parts. Use a dedicated outlet for this appliance. • There is risk of fire or electrical shock. Do not place a heater or other appliances near the power cable.
Unplug the unit if strange sounds, odors, or smoke comes from it. • There is risk of electric shock or fire. Be cautious that water could not enter the product. • There is risk of fire, electric shock, or product damage. ■ Installation Always check for gas (refrigerant) leakage after installation or repair of product. • Low refrigerant levels may cause failure of product. Keep level even when installing the product. • To avoid vibration or water leakage.
■ Operation Use a soft cloth to clean. Do not use harsh detergents, solvents, etc. Do not touch the metal parts of the product when removing the air filter. They are very sharp! • There is risk of fire, electric shock, or damage to the • There is risk of personal injury. plastic parts of the product. x Wa Do not step on or put anyting on the product. (outdoor units) • There is risk of personal injury and failure of product.
Dimensions Dimensions Symbols Used in this Manual This symbol alerts you to the risk of electric shock. This symbol alerts you to hazards that could cause harm to the air conditioner. NOTICE This symbol indicates special notes.
Dimensions Outdoor Unit L2 D L1 W H L3 L5 Gas side (3-way valve) L4 Liquid side (2-way valve) DIM MODEL unit 9k, 12k Btu Series W mm 770 H mm 540 D mm 245 L1 mm 287 L2 mm 64 L3 mm 518 L4 mm 10 L5 mm 100 Service Manual 11
Product Specifications Product Specifications Table-1 Model Name Item MIN Cooling Capacity Type Max MIN Heating Capacity Type Max Power Input Running Current Starting Current Cooling Heating Cooling Heating Cooling Heating Cooling EER Heating COP Power Supply Power Factor Air Circulation Cooling Heating Indoor,Max Outdoor,Max Moisture Removal Noise Level Indoor,High (Sound Med. Pressure,1m) Low Outdoor,Max Refrigerant(R410A)Charge Power Cord Connecting Cable Connecting Tube Liquid Side (Ø.
Installation Installation Select the best Location Indoor unit 1. Do not have any heat or steam near the unit. 2. Select a place where there are no obstacles in front of the unit. 3. Make sure that condensation drainage can be conveniently routed away. More than 5cm More than 10cm 4. Do not install near a doorway. 5. Ensure that the interval between a wall and the left (or right) of the unit is more than 50cm.
Installation Piping Length and Elevation Pipe Size Capacity (Btu/h) GAS LIQUID Standard Length (m) 9k 3/8" 1/4" 4 or 5 7 15 20 12k 1/2" 1/4" 4 or 5 7 15 20 Indoor unit Additional Max. Max. Elevation B (m) Length A (m) Refrigerant (g/m) Outdoor unit Outdoor unit A B A Indoor unit Outdoor unit Oil trap B A Indoor unit B If piping length is more than 5m CAUTION: Capacity is based on standard length and maximum allowance length is on the basis of reliability.
Installation 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 (3/16"~5/16") Outdoor 5-7mm Indoor Flaring Work Main cause for gas leakage is due to defect in flaring work. Carry out correct flaring work in the following procedure. Cut the pipes and the cable. 1. Use the piping kit accessory or the pipes purchased locally.
Installation Check 1. Compare the flared work with the figure by. Smooth all round Inside is shiny without scratches 2. If a flared section is defective, cut it off and do flaring work again. = Improper flaring = Even length all round Inclined Surface Cracked Uneven damaged thickness Connecting the Piping Indoor 1. Prepare the indoor unit's piping and drain hose for installation through the wall. 2.
Installation 4. Indoor unit installation Hook the indoor unit onto the upper portion of the installation plate.(Engage the two hooks of the rear top of the indoor unit with the upper edge of the installation plate.) Ensure that the hooks are properly seated on the installation plate by moving it left and right. Connecting cable Drain hose Press the lower left and right sides of the unit against the installation plate until the hooks engage into their slots(clicking sound).
Installation For left rear piping 1. Route the indoor tubing and the drain hose to the required piping hole position. 1 2 Connecting cable 2. Insert the piping, drain hose, and the connecting cable into the piping hole. 3. Insert the connecting cable into the indoor unit. • Don't connect the cable to the indoor unit. • Make a small loop with the cable for easy connection later. Drain pipe 4. Tape the drain hose and the connecting cables. 5.
Installation Wrap the insulation material around the connecting portion. 1. Overlap the connection pipe heat insulation and the indoor unit pipe heat insulation material. Bind them together with vinyl tape so that there may be no gap. 2. Wrap the area which accommodates the rear piping housing section with vinyl tape. Plastic bands Insulation material Indoor unit piping Connection pipe Vinyl tape (wide) Wrap with vinyl tape Pipe Vinyl tape(narrow) Connecting cable 3.
Installation CAUTION: Installation Information For left piping. Follow the instruction below. Good case • Press on the upper side of clamp and unfold the tubing to downward slowly. Bad case • Following bending type from right to left may cause damage to the tubing.
Installation Outdoor Align the center of the pipings and sufficiently tighten the flare nut by hand. 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. Outside diameter mm inch Ø6.35 1/4 Ø9.52 3/8 Ø12.7 1/2 Ø15.88 5/8 Ø19.05 3/4 Torque kg.m 1.8 4.2 5.5 6.6 6.
Installation Connecting the Cables Indoor Connect the cable to the indoor unit by connecting the wires to the terminals on the control board individually according to the outdoor unit connection. (Ensure that the color of the wires of the outdoor unit and the terminal No. are the same as those of the indoor unit.) CAUTION: • The above circuit diagram is subject to change without notice. • The earth wire should be longer than the common wires.
Installation Outdoor 1. Remove the control cover from the unit by loosening the screw. Connect the wires to the terminals on the control board individually. Outdoor Unit Terminal block 2. Secure the cable onto the control board with the cord clamp. 3. Refix the control cover to the original position with the screw. 4. Use a recognized circuit breaker 20A(12k) between the power source and the unit. A disconnecting device to adequately disconnect all supply lines must be fitted.
Installation Checking the Drainage To check the drainage. 1. Pour a glass of water on the evaporator. Connecting area drain hose 2. Ensure the water flows through the drain hose of the indoor unit without any leakage and goes out the drain exit. Leakage checking Drain pan Drain hose Leakage checking Drain piping 1. The drain hose should point downward for easy drain flow. Downward slope 2. Do not make drain piping like the following.
Installation Forming the Piping Form the piping by wrapping the connecting portion of the indoor unit with insulation material and secure it with two kinds of vinyl tapes. Seal small openings around pipings with a gum type sealer. Taping • If you want to connect an additional drain hose, the end of the drain outlet should be routed above the ground. Secure the drain hose appropriately. Drain hose Pipings In cases where the outdoor unit is installed below the indoor unit perform the following.
Installation Air Purging Air purging The air and moisture remaining in the refrigerant system have undesirable effects as indicated below. 1. Pressure in the system rises. 2. Operating current rises. 3. Cooling(or heating) efficiency drops. 4. Moisture in the refrigerant circuit may freeze and block capillary tubing. 5. Water may lead to corrosion of parts in the refrigeration system. Therefore, after evacuating the system, take a leak test for the piping and tubing between the indoor and outdoor unit.
Installation Soap water method 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.
Installation Test Running 1. Check that all tubing and wiring are properly connected. 2. Check that the gas and liquid side service valves are fully open. Prepare remote controller 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. NOTICE • Use 2 AAA(1.5volt) batteries. Do not use rechargeable batteries.
Installation NOTICE If the actual pressure is higher than shown, the system is most likely over-charged, and charge should be removed. If the actual pressure are lower than shown, the system is most likely undercharged, and charge should be added. PUMP DOWN This is performed when the unit is relocated or the refrigerant circuit is serviced. Pump Down means collecting all refrigerant into the outdoor unit without the loss of refrigerant. CAUTION: Be sure to perform Pump Down procedure in the cooling mode.
Functions Functions Indoor Unit Operation ON/OFF by Remote controller Sensing the Room Temperature • Room temperature sensor. (Thermistor) • Pipe temperature sensor. (Thermistor) Room temperature control • Maintain the room temperature in accordance with the Setting Temp. Starting the Current Control • Indoor fan is delayed for 5 sec at the starting. Time Delay Safety Control • Restarting is for approx. 2 minutes.
Functions Outdoor Unit Power relay control • If power is on, it will operate to chage capacitor on controller and power relay will operate after about 2~5sec. Stand by control at low temp. • If outdoor temp. is below 0°C, preheater is operating for 1~5min. • At the initial, It will be operated compressor after 1min. for preheating. Active power filter control(PSC) • The active power filter is designed to correct power factor(cos θ) and to regulate DC link voltage.
Functions 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.
Operation Operation LED display of indoor unit ■ LG Brand/OEM Brand Operation Indicator • On while in appliance operation, off while in appliance pause. • Blinking(3sec off/0.5sec on) according to Error Code as long as the system malfunctions. Sleep Timer Indicator • On while in sleep timer mode, off when sleep timer cancel or appliance operation pause. PLASMA Indicator Timer Indicator Preheat Indicator • On while in plasma mode, off when plasma mode cancel.
Operation Protection of the evaporator pipe from frosting • If the indoor pipe temperaure is below 0°C in 7 min. after the compressor operates without pause while in cooling cycle operation mode, ➔ compressor, outdoor fan are turned off. • When indoor pipe temp. is 7°C or higher after 2 min pause of compressor ➔ compressor, outdoor fan is turned on according to the condition of the room temperature. Comp. free 6˚C 3˚C 0˚C Comp. Step 4 Comp. Step 2 Indoor pipe temp. 7˚C Comp.
Operation Cooling mode operation • Operating frequency of compressor depend on the difference of the temperature. (= intake air Temp.- Compressor off Temp. • Compressor off temp.= setting temp. -0.5°C on temp. = setting temp. +0.5°C • If compressor operates at some operating frequency, the operating frequency of compressor cannot be changed within 30 seconds. • Condition of compressor turned off - When intake air temperature stay at the temperature between setting temp. -0.5°C and setting temp. -1.
Operation Healthy Dehumidification mode operation • When the dehumidification operation is set by the remote controller the intake air temperature is detected and the setting temp. is automatically set according to the intake air temperature. Intake air Temp. Setting Temp. 26°C ≤ intake air temp. 25°C 24°C ≤ intake air temp.< 26°C intake air temp. -1°C 18°C < intake air temp. < 24°C intake air temp. -0.5°C intake air temp. ≤ 18°C 18°C • When intake air temp reaches above the temp of setting +1.
Operation Heating mode operation • Operating frequency of compressor depend on the difference of the temperature (= compressor off temp. - intake air temp.) • Compressor off temp. = setting temp.+3.0°C on temp. = setting temp. • If compressor operates at some operation frequency, the operating frequency of compressor cannot be changed within 30 seconds. • Condition of compressor turned off - When intake air temperature reaches +3°C above the setting temperature.
Operation Fuzzy mode operation(Optional)s • When any of operation mode is not selected like the moment of the power on or when the unit turned off, the operation mode is selected. • When determining the operation mode, the compressor, outdoor fan are off and only the indoor fan is operated for 15~20 seconds, then an operation mode is selected according to. Basis of determining operating mode Indoor temp. Operating Mode over 24°C Cooling 21~24°C Healthy Dehumidification below 21°C Heating 1.
Operation 2. Fuzzy operation for Heating • According to the setting temperature selected by Fuzzy rule, the operating frequency of compressor is determined like heating mode operation. • At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the intake air temperature at that time. • When the Fuzzy key(=setting temp.
Operation Jet cool mode operation • 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 super-high speed for 30 min. at cooling mode operation. • In the Jet Cool mode, the room temperature is controlled to the setting temperature, 18°C.
Operation Sleep timer operation • When the sleep time is reached after [1,2,3,4,5,6,7hr] is input by the remote control during the operation, the operation of the appliance stops. • When the appliance is on pause, the sleep timer mode cannot be input. 1. Sleep timer operation for cooling cycle • While in cooling mode operation, 30 min. later since the start of the sleep timer, the setting temperature increase by 1°C. After another 30min. elapse, it increases by 1°C again. Setting temp. (˚C) 1.0˚C up 1.
Operation Auto restarting operation • When the power is restarted 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. • Operation mode that is kept on the memory - State of operation ON/OFF - Operation mode/setting temp.
Operation Protection from total current control ■ CT1 control • If the operating current reaches I1, the operating frequency of the compressor decrease. • After decreasing the operating frequency by 1step, if operating current is below I1 for 60 seconds continuously, the operating frequency of compressor increase by 1step. ■ CT2 control • If the operating current of the appliance reaches I2, the compressor stop instantly and 2 minutes later the compressor restart again.
Operation Portection from overheating of power module • If the temperature of the heat sink TH. reaches over Toff, the Compressor stop instantly. • It will be limited the compressor operating frequency according to the heat sink TH.(refer to below FIG.) • It will be blink 4 times, when the thermistor is open or short, also the temperature is over Toff. T off °C ∆T = (T off - T on) T1 = T on + ∆T T2 = T on + 2 * ∆T Heat Sink Temp. T2 °C No.
Operation Defrosting control • 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. • Defrosting control is available 50 minutes later since heating cycle started and the pipe temperature of outdoor unit reaches below -6°C. Minimum Time of Heating Operating Freq. of Comp. 15s 6s Main Deice time 30s 4-Way 1 min Setting Freq. Setting Freq.
Operation Auto Cleaning • Function used to perform the Self Cleaning to prevent the Unit from Fungus and Bad Odors. • Used after the Shut Down of Cooling Operation to Clean the Evaporator and keep it as fresh for the Next operation. • During Self Cleaning the Outdoor Unit is Switched off. • The function is easy to be operated as It is accessed through the Remote Controller. 1) Heat/pump Model 2) Cooling/only Model ON OFF Cooling CYCLE Comp.
Disassembly Disassembly 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. • Hold up Inlet Grille Horizentally. • To remove the Grille, pull the lower left and right side of the grille toward you (slightly tilted) and lift it straight upward. • To seperate connecter assembly and than to remove Inlet Grille assembly. 1.
Disassembly 2. To remove the Control Box. • Remove securing screws. • Pull the control box out from the chassis carefully. 3. To remove the Discharge Grille. • Unhook the discharge grille and pull the discharge grille out from the chassis carefully. 4. To remove the Evaporator. • Remove 3 screws securing the evaporator(at the left 2EA in the Eva Holder, at the right 1EA).
Disassembly • 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. • Pull the motor cover out from the chassis carefully. Motor cover 6. To remove the Cross-Flow Fan • Loosen the screw securing the cross-flow fan to the fan motor (do not remove). • Lift up the right side of the cross-flow fan and the fan motor, separate the fan motor from the cross-flow fan.
2 4 2 4 AC 230V/50Hz AC POWER TO OUT DOOR 1 1 SH-CAPACITOR 2uF 370/400V MOTOR INDOOR FAN ROOM-TH PIPE-TH L8 L6 L5 L7 L9 L10 L3 1 1 2 1 2 1 1 1 CORE 1 Turn 6200JB8011Z WCN-NOISE 1 CN-IN/N CN-COM 1 1 CN-OUT/N 3 3 1 5V Vout GND Vcc RECEIVER CN-MOTOR 2 3 2 4 3 L1 L2 CN-TH 4 L4 D1-f D1-a D2-d ZNR01N SVC561D-14A 250V/T2A FUSE1 RY-PWR G4A-1A-E ZNR01F SVC561D-14A C01N 0.22uF 275VAC N/F01N 11mH/1.
Schematic Diagram Outdoor(AS-W096_Series, AS-W126_Series) Service Manual 51
Schematic Diagram Wiring Diagram Indoor Unit (AS-W096/126U_0,1 Series OR BK WCN-NOISE CN-DISP1 CN-IN BL CN-OUT BR 4 CN-HVB CN-L/R BL CN-U/D SH-CAPA. FUSE AC250V/T2A 3 RY-PWR STEP MOTOR RD RD BK BK H.V.
Schematic Diagram Outdoor Unit AS-W096U_0 Series AS-W126U_0 Series REVERSING VALVE REACTOR OUTDOOR WIRING DIAGRAM Motor WCNCAP1 WCNCAP2 RY-H WCN-NOISE 4(BK) BK OR YL CNFAN1 RY-4WAY BK HEAT SINK TH. OUTDOOR PIPE TH. TH. COMP TH.
Schematic Diagram Components Location INDOOR MAIN P.W.
Schematic Diagram DISPLAY ASSEMBLY(AS-W096/126U_0,1 Series) TOP VIEW CN-DISP LED MODULE RECEIVER PWB: 6870A90178A PWB ASM: 6871A20463 C01G BOTTOM VIEW LED MODULE Data1 Data2 Data3 Data4 Data5 G10R G30R G40R G50R Scan1 Scan2 Scan3 Scan5 Vcc Vo G60R Scan4 GND Service Manual 55
Room Air Conditioner WCN-NOISE1 R11Z R09Z D03Z R08Z D02Z R07Z PSC_Module BL/WH C02J WCN-NOISE3 C01J 13 1 5 11 15 9 20 17 13 9 20 17 BR/BK R15Z R16Z ZNR01J C03J C05J NF02J NF01J R01J C08J ZNR02J C04J C07J C06J PTC C16Z 15 11 9 R02S 21 22 23 24 25 26 27 R09K RY-PWR R14Z C19Z SPM3 : 6002EC2005 SPM3 C12Z C10Z 5 C08Z 1 2005.01.
Troubleshooting Guide Troubleshooting Guide Refrigeration Cycle Diagram (1) Model Capillary Tube INDOOR UNIT OUTDOOR UNIT LIQUID SIDE CHECK VALVE 3-WAY VALVE HEAT EXCHANGE (EVAPORATOR) HEAT EXCHANGE (CONDENSER) GAS SIDE 3-WAY VALVE REVERSING VALVE ACCUMU LATOR COOLING HEATING COMPRESSOR (2) Model Adopted Electrion Expansion Valve INDOOR UNIT OUTDOOR UNIT LIQUID SIDE EER 3-WAY VALVE HEAT EXCHANGE (EVAPORATOR) HEAT EXCHANGE (CONDENSER) GAS SIDE 3-WAY VALVE REVERSING VALVE ACCUMU LATOR COM
Troubleshooting Guide Pipe Length and the Elevation Pipe Size GAS LIQUID Standard Length (m) 3/8"(Ø9.52) 1/4"(Ø6.35) 4 or 7.5 7 15 20 1/2"(Ø12.7) 1/4"(Ø6.35) 4 or 7.5 7 15 20 1/2"(Ø12.7) 1/4"(Ø6.35) 4 or 7.5 15 30 20 5/8"(Ø15.88) 1/4"(Ø6.35) 4 or 7.5 15 30 20 5/8"(Ø15.88) 3/8"(Ø9.52) 4 or 7.5 15 30 30 5/8"(Ø15.88) 3/8"(Ø9.52) 7.5 15 30 30 3/4"(Ø19.05) 3/8"(Ø9.52) 7.5 15 30 50 Capacity (Btu/h) 7k~14k 18k~28k 30k~38k Max. Elevation B (m) Max.
Troubleshooting Guide 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.
Troubleshooting Guide 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.
Troubleshooting Guide 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 (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. (2) Operate the unit for 10 to 15 minutes.
Troubleshooting Guide Re-air Purging (Re-installation) Liquid side Indoor unit 3-Way valve Closed Outdoor unit Gas side Closed 3-Way valve Gas cylinder Lo R22 OPEN CLOSE • Procedure (1) Confirm that both the liquid side valve and the gas side valve are set to the closed position. (2) Connect the charge set and a gas cylinder to the service port of the Gas side valve. – Leave the valve on the gas cylinder closed. (3) Air purging. – Open the valves on the gas cylinder and the charge set.
Troubleshooting Guide Balance Refrigerant of the 3-way Valve (Gas leakage) Liquid side Indoor unit Outdoor unit 3-Way valve Open Gas side 3-Way valve Open Lo OPEN CLOSE • Procedure (1) Confirm that both the 2-way and 3-way valves are set to the back seat. (2) Connect the charge set to the 3-way valve’s port. – Leave the valve on the charge set closed. – Connect the charge hose to the service port.
Troubleshooting Guide Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit 3-Way valve Open Gas side 3-Way valve Open Vacuum pump Lo OPEN CLOSE • Procedure (1) Connect the vacuum pump to the center hose of charge set center hose (2) Evacuation for approximately one hour. – Confirm that the gauge needle has moved toward -76 cmHg (vacuum of 4 mmHg or less).
Troubleshooting Guide Gas Charging (After Evacuation) Liquid side Indoor unit 3-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 dis-connected 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 reverse the cylinder so that the system can be charged with liquid.
Troubleshooting Guide Cycle Parts Trouble analysis 1. Check temperature difference between intake and discharge air and operating current. Temp. Difference Operating Current Temp. difference : approx. 0°C Current : less than 80% of rated current • All amount of refrigerant leaked out. Check refrigeration cycle. Temp. difference : approx. 8°C Current : less than 80% of rated current • Refrigerant leakege Clog of refrigeration cycle Defective compressor Temp.
Troubleshooting Guide Self-diagnosis function 1. The malfunction indicator of indoor (see the operating LED of the INDOOR) Error Code The cause of malfunction Malfunction indicator The operating state Indoor TH. is short or open. The operating LED will be blinking once. Keep operating state. Outdoor TH. is short or open. The operating LED will be blinking twice. Keep operating state. 4 Temp. of Heat sink is over 95°C. /Heat sink TH. is short or open. The operating LED will be blinking 4 times.
Troubleshooting Guide ■ Precaution in Service or Check Even after stopping the operation of product, it takes some time to discharge the remaining electricity of the electrolytic capacitor that was charged. Before starting a checking or repairing job, pull out the plug out of the outlet and make sure that the lamp on the control board outdoor unit is off. ■ The Diagnosis Procedure Check the supplied voltage to product (AC 220V/230V ± 30V). Check the connecting cable between Indoor and Outdoor.
Troubleshooting Guide Electronic Parts ❇ Refer to electronic contorol device drawing & schematic diagram. Trouble 1 The Product doesn’t operate at all. Turn off the main power and wait to 10 seconds Turn on the main power again. Does "Beeping" sound is made from the indoor unit? NO YES Check the voltage of power(AC220V/AC240V, 50Hz). • The voltage of main power. • The voltage applied to the unit. • The connecting method of Indoor/Outdoor connecting cable (each color) • The P.C.B.
Troubleshooting Guide Trouble 2 Product doesn't 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 2 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 as force).) Caused by the remote controller.
Troubleshooting Guide Trouble 3 The Compressor/Outdoor Fan are unable to drive. Turn on the main power. Operate Cooling Mode by setting the disired 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 attatched as close as to be effected by the themperature of Heat Exchange (EVA.
Troubleshooting Guide Trouble 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.45 of micom and the part for driving SSR. • Check the related pattern. • Check the SSR. - SSR Open: Indoor Fan Motor never operate. - SSR short: Indoor Fan Motor always operates in case of ON or OFF.
Troubleshooting Guide Trouble 5 When the horizontal 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 • Check the soldering condition(on PCB) of CN-U/D Connector Check the operating circuit of the vertical louver • Confirm that there is DC +12V between pin ➀ of CN-U/D and GND.
Troubleshooting Guide Trouble 6 The heater does not operate at all. Turn off main power Check the wire connection of PTC Heater (Refer to Wiring Diagram) • Check the connecting condition of CN-PTC connector on the indor DC P.C.B Ass'y. • Check the soldering condition of CN-PTC connector on the indoor DC P.C.B Ass'y. Check the Heater driving Circuit. • Check the pattern between MICOM Pin No. 48 → IC02M Pin No. 7 → IC02M Pin No. 10 → CN-PTC If there is no problem result of all above check.
Troubleshooting Guide Trouble 7 The Outdoor Unit does not operate at all. YES Does the Operating LED of indoor unit blink when Operation's ON? Refer to the self-diagnosis function. NO NO Is the Connection between indoor power relay Pin ➂ and terminal block No.
Troubleshooting Guide Trouble 8-1 When compressor does not operate normally. ■ DC Peak Error(Error Code ➅) NO Does the LED01M of outdoor PCB Ass'y blink 6 times? Check the state of connecting cable (3 line) between indoor and outdoor uint. YES NO Is the connecting state of connectors in outdoor. PCB Ass'y right? (CN-UVW) • Electrical wiring diagram (Colors) • Check the connecting state of connectors in PCB Ass'y • If CN-UWV is connected, the comprressor can be operated a opposite direction.
Troubleshooting Guide Trouble 8-2 When compressor does not oprate normally. ■ Communication error between Indoor and Outdoor (Error Code ➄) NO • Check the state of connecting cable (3 line) bewteen indoor and outdoor unit . • Check Fuse, Noise Filter, PTC, etc. Does the operating LED in display PCB Ass'y blink 5 times? YES NO • Electrical wiring diagram(Colors) • Check the connecting state of connectors in outdoor PCB Ass'y • Check the Fuse of outdoor PCB Ass'y.
Troubleshooting Guide Trouble 8-3 When compressor does not oprate normally. ■ CT Error (Error Code ➆) NO • Check the state of connecting cable (3 line) bewteen Indoor and Outdoor Unit . • Check fuse, Noise Filter, PTC, etc. Does the operating LED in Display PCB Ass'y blink 7 times? YES NO Is the courrent transformer(CT) in Main PCB Ass'y right? Check the PCB pattern(resoldering) YES NO Is the indoor/outdoor fan locked? Check the indoor/outdoor fan motor.
Troubleshooting Guide ■ The problem of missing the connector (INDOOR MAIN PCB ASSY) Connectors Condition Problem (error mode) CN-AC/DC OPEN • Malfunctions all indoor & outdoor unit. • Malfunctions remocon, force, test operation mode. CN-FAN OPEN • Malfunctions indoor fan motor. CN-T/Block OPEN • Malfunctions outdoor unit. • Stop compressor and outdoor fan motor. • The operation LED blinks 5 times. • Communication error. CN-DISP1 OPEN • Malfunctions remote contoller.
Exploded View Exploded View Indoor Unit 135312 159830 152302 668713-2 135080-1 146811-2 145200 668713-1 135314 237900 733010 135080-2 267110 359011 342800 354210 131410 352150 346810 249951 264110 266090 35211B 146811-1 263230 147581 135311 268714 135516 80 Room Air Conditioner W0CZZ
Exploded View Outdoor Unit 437210 263230 437212 554031 435511 435301 546810 552102 559010 649950 552201 552111 552116 447910 668711 552202 561410 554160 661400 550140 552203-1 430410 552203-2 Service Manual 81
Replacement Parts List Replacement Parts List Indoor Unit LOCATION No.
Replacement Parts List Outdoor Unit LOCATION No. DESCRIPTION PART No.
P/No.