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LG A2UN186FA0 Service Manual

Inverter multi type room air conditioner
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Multi Type Room

Air Conditioner

SERVICE MANUAL

Indoor Unit: AMNN076L/M/NQA0
AMNN096L/M/NQA0
AMNN126L/M/NRA0
AMNN186L/M/NTA0
AMNN246L/M/NTA0
AMNN096APA0
AMNN126APA0
AMNN126TEA0
AMNN186TEA0
AMNN186VBA0
Outdoor Unit: A2UN186FA0
A3UN216FA0
A4UN306FA0

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Summary of Contents for LG A2UN186FA0

  • Page 1: Air Conditioner

    Multi Type Room Air Conditioner SERVICE MANUAL INDOOR UNIT: AMNN076L/M/NQA0 AMNN096L/M/NQA0 AMNN126L/M/NRA0 AMNN186L/M/NTA0 AMNN246L/M/NTA0 AMNN096APA0 AMNN126APA0 AMNN126TEA0 AMNN186TEA0 AMNN186VBA0 OUTDOOR UNIT: A2UN186FA0 A3UN216FA0 A4UN306FA0...

  • Page 2: Table Of Contents

    Contents Functions............................3 Product Specifications .........................6 Dimensions..........................10 Wiring Diagram ...........................15 Refrigeration Cycle Diagram......................17 Operation Details ........................18 Display Function .........................34 Self-diagnosis Function ......................34 Installation ...........................35 Operation .............................73 Disassembly of the parts (Indoor Unit) ..................77 Valve service(3-way) ........................86 Cycle Troubleshooting Guide ....................90 Electronic Parts Troubleshooting Guide...................91 Electronic Control Device ......................104 Schematic Diagram........................111...

  • 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 seconds at the starting. Time Delay Safety Control •...
  • Page 4 Outdoor Unit Power relay control • If power is on, it will operate to chage capacitor on controller and power relay will operate after about 10sec. Comp. Freq. control • The final operating freq. of comp. is set the lowest freq. that limited outdoor temp., discharge pipe temp., target freq., owing to CT.

  • Page 5: Remote Controller

    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 Down to 18°C Down to 16°C...

  • Page 6: Product Specifications

    Product Specifications Indoor AMNN076L/M/NQA0 AMNN096L/M/NQA0 AMNN126L/M/NRA0 AMNN186L/M/NTA0 Model Item Outdoor A3-N216FA0/A2-N186FA0 Btu/h 7,000 9,000 12,000 18,000 Cooling Capacitor (Indoor) 2,051 2,637 3,517 5,274 Btu/h 23,400 Max. Cooling Capacitor (Outdoor) 6,856 Btu/h 8,000 10,000 13,000 19,000 Heating Capacitor (Indoor) 2,344 2,930 3,809 5,567 Btu/h...
  • Page 7 Indoor AMNN076L/M/NQA0 AMNN096L/M/NQA0 AMNN126L/M/NRA0 AMNN186L/M/NTA0 AMNN246L/M/NTA0 Model Item Outdoor A4-N306FA0 Btu/h 7,000 9,000 12,000 18,000 23,000 Cooling Capacitor (Indoor) 2,051 2,637 3,517 5,274 6,739 Btu/h 31,000 Max. Cooling Capacitor (Outdoor) 9,083 Btu/h 8,000 10,000 13,800 19,000 26,000 Heating Capacitor (Indoor) 2,344 2,930 4,044...
  • Page 8 Indoor AMNN096APA0 AMNN126APA0 AMNN126TEA0 AMNN186TEA0 AMNN186VBA0 Model Item Outdoor A3-N216FA0/A2-N186FA0 Btu/h 9,000 12,000 12,000 18,000 18,000 Cooling Capacitor (Indoor) 2,638 3,517 3,517 5,275 5,275 Btu/h 23,400 Max. Cooling Capacitor (Outdoor) 6,856 Btu/h 10,000 13,800 13,800 19,000 19,000 Heating Capacitor (Indoor) 2,931 4,044 4,044...
  • Page 9 Indoor AMNN096APA0 AMNN126APA0 AMNN126TEA0 AMNN186TEA0 AMNN186VBA0 Model Item Outdoor A4-N306FA0 Btu/h 9,000 12,000 12,000 18,000 18,000 Cooling Capacitor (Indoor) 2,638 3,517 3,517 5,275 5,275 Btu/h 23,400 Max. Cooling Capacitor (Outdoor) 6,856 Btu/h 10,000 13,800 13,800 19,000 19,000 Heating Capacitor (Indoor) 2,931 4,044 4,044...

  • Page 10: Dimensions

    Dimensions 1. Indoor Unit • Room Type Indoor Unit Installation plate MODEL 7K, 9K Btu Series 12K Btu Series 18K, 24K Btu Series 1,090 - 10 -...
  • Page 11 • Art Cool Type Indoor Unit Hanger Hole Fix Hole Pipe Hole MODEL INDOOR UNIT Unit - 11 -...
  • Page 12 • Convertible Type Indoor Unit 1 2 0 0 m m 205mm 63mm 38mm 175mm (Installation Plate) 250mm (Rear Side) - 12 -...
  • Page 13 • Cassette Type Indoor Unit CLOSE OPEN OPEN CLOSE - 13 -...
  • Page 14 2. Outdoor Unit MODEL A2UN186FA0/A3UN216FA0 A4UN306FA0 - 14 -...

  • Page 15: Wiring Diagram

    Wiring Diagram 1. Room Type Indoor Unit 2. Art Cool Type Indoor Unit MAIN PCB ASSY MOTOR STEP MOTOR FUSE STEP 250V 3.15A MOTOR 1(L) 2(N) STEP MOTOR 3854A20135F CN-D1 CN-D2 TO OUTDOOR UNIT DISPLAY CONNECT STEP MOTOR PCB ASSY ASSY STEP MOTOR...

  • Page 16: Outdoor Unit

    4. Outdoor Unit Comp. 400V,2500µF(DC LINK) CAPACITOR GATE1 GATE2 MOTOR BRIDGE DIODE YL BR BL BK OR CAPACITOR (8PIN) (7PIN) (9PIN) (400V,165µF) CN-FAN CN-DC GATE1 GATE2 BRIDGE OPTION DIODE D-LEV MAIN A-LEV B-LEV (RD) POWER C-LEV RELAY COND SENSOR L/P SWITCH SENSOR A-PIPE SENSOR...

  • Page 17: Refrigeration Cycle Diagram

    Refrigeration Cycle Diagram 1. A2-N186FA0 Refrigerant flow Indoor Unit Outdoor Unit B-gas pipe sensor A-gas pipe sensor Gas side Service Valve 4-WAY VALVE UNIT-B UNIT-A Heating sensor Discharge pipe sensor Indoor temperature sensor Comp Heat Exchanger A-LEV B-LEV Strainer Liquid side Service Valve 2.

  • Page 18: Operation Details

    Operation Details 1. Room/Art Cool Type Indoor Unit (1) The Function of main control • DISPLAY 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 19: Defrost Control

    • While in compressor off, the indoor fan is off when the indoor pipe temp is below 33°C, when above 35°C , it operates with the low airflow speed. • If overloaded while in heating mode operation, in order to prevent the compressor from OLP operation, the outdoor fan is turned on/off according to the indoor pipe temp.
  • Page 20 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.
  • Page 21 Off-Timer <=> On-Timer Operation • When the set time is reached after the on/off time is input by the remote control, the on/off-timer operation is carried out according to the set time. Sleep Timer Operation • When the sleep time is reached after <1,2,3,4,5,6,7,0(cancel) hr> is input by the remote control while in appli- ance operation, the operation of the appliance stops.
  • Page 22 Forced Operation • To operate the appliance by force in case that the remote control is lost, the forced operation selection switch is on the main unit of the appliance to operate the appliance in the standard conditions. • When the power is supplied while the slide switch is on the forced operation position, or when the slide switch position is switched to the Auto Restarting (or test operation) position or switched from the remote control position to the forced operation position while the power is on, the forced operation is carried out.
  • Page 23 2. Cassette Type Indoor Unit (1) The function of main control Time Delay Safety Control • 3 min ... The compressor is ceased for 3minutes to balance the pressure in the refrigeration cycle. (Protection of compressor) • 5 sec ... Vertical air flow direction control louvers open in 5 seconds to prevent noise between louvers and wind. •...

  • Page 24: Heating Mode Operation

    Heating Mode Operation The unit will operate according to the setting by the remote controller and the operation diagram is shown as following. Intake Air temp. minimum 3min Setting temp.+3°C (Compressor OFF) Setting temp. (Compressor ON) minimum minimum minimum 1min 10sec.
  • Page 25 Defrost 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. • Defrost control is available 45 min. later since heating mode operation started, and it will not prolong over 10 min. •...

  • Page 26: Time Delay Safety Control

    3. Convertible Type Indoor Unit (1) The function of main control 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 27 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 28 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 29 • 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 30 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 31 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 32: Deice Control

    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 33 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 34: Display Function

    Display Function Operation Indicator • Cooling, Soft Dry, Fan, Heating Sleep Timer Indicator • Sleep Mode Timer Indicator • Timer Mode Defrot Indicator • Hot-start, Defrost Self-diagnosis Function Error Indicator • The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble. •...

  • Page 35: Installation

    Installation of Indoor, Outdoor Unit 1. Selection of the best location (1) Indoor unit 1. Room Type Indoor Unit Front There should not be any heat source or steam near the • Left unit. • There should not be any obstacles to prevent the air cir- Rear left culation.
  • Page 36 4. Convertible Type Indoor Unit More than • There should not be any heat source or steam near the 20cm unit. • There should not be any obstacles to prevent the air cir- More than culation. 20cm • A place where air circulation in the room will be good. •...

  • Page 37: Piping And Drainage Of Indoor Unit

    2. Piping and Drainage of Indoor Unit (1) Preparation of pipings 1. Cut the pipes and the cable. • Use the accessory piping kit or the pipes pur- chased locally. Copper • Measure the distance between the indoor and Slanted Uneven Rough tube 90°...

  • Page 38: Piping Connection

    Piping Connection 1. Form the piping according to its routing. Avoid bending and bending back the same piping point more than three times. (This will result in hard- Liquid side ening the pipe.) 2. After deforming the piping, align centers of the Indoor union fitting of the indoor unit and the piping, and unit...

  • Page 39: The Indoor Unit Installation

    3. The Indoor Unit Installation Installation Plate (1) Room Type Indoor Unit The mounting wall should be strong and solid enough to protect it from the vibration. 1. Mount the installation plate on the wall with four Type "A" screws. marking-off line Type "A"...
  • Page 40 1) 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.
  • Page 41 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.
  • Page 42 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. Drain hose Taping Piping...
  • Page 43 (2) Cassette Type Indoor Unit 1) 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 •...
  • Page 44 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) Set screw of Cardboard cardboard (4 pieces)
  • Page 45 2) Installation of Decorative Panel The decorative panel has its installation Before installing the decorative panel, direction. always remove the paper template. 1. Temporarily fix two decorative 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 46 (3) Art Cool Type Indoor Unit 2. Cover pipe and cover side remove • Remove two screws(for fixing cover pipe) 1) Preparing work for Installation • Pull up the cover side of desired connecting direc- The wall you select should be strong and solid enough tion, then cover side is separated.

  • Page 47: Fixing Indoor Unit

    2) Sticking the installation guide map and fixing Indoor unit 1. Put an Installation Guide Map on the desired 7. Drill the piercing part for connecting pipe as surface. diameter 50mm. (In case of piercing rear surface) INSTALLATION GUIDE MAP Refer to No.
  • Page 48 4) Connection of piping Indoor • Tighten the flare nut with a wrench. • Preparing the indoor unit's piping and drain hose for installation through the wall. Open-end wrench (fixed) 1. Route the indoor tubing and the drain hose in the direction of rear left or right.
  • Page 49 • Wrap the area which accommodates the rear piping housing section with vinyl tape. Indoor Connection unit pipe pipe Vinyl tape Wrap with vinyl tape (wide) Connecting cable Pipe Vinyl tape(narrow) • Bundle the piping and drain hose together by wrap- ping them with vinyl tape for enough to cover where they fit into the rear piping housing section.
  • Page 50 5) Panel Front Assembly 1. First, Check the side cover assembly exactly, Fix power cord in the bottom groove of cover side left. 2. Assemble connecting lead wire with controller and first fix the upper part of panel front, then match the lower part of panel front Panel Front Connector...
  • Page 51 (4) Convertible Type Indoor Unit 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 52 • 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 53 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 54 • 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 59. • Hook up the Inlet Grille Hook to the cabinet. Inlet hanger •...
  • Page 55 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 56 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 57 3) Installation on the floor Installation of Mount Bracket. From the left wall • Select and mark the position for Mount Brackets and more than 760mm the piping hole. • Drill the hole for the anchor nut on the wall. From the •...
  • Page 58 4) Connecting the pipes to the indoor unit (Installation on the ceiling) 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 nut with fingers.
  • Page 59 6) Connecting the pipes to the indoor unit (Installation on the wall or floor) 1. For the Right Rear Piping • Remove the knock-out at the back side of the cabinet. • After bending an end of the connecting tube, align the Piping center of the pipings and sufficiently tighten the flare nut with fingers.
  • Page 60 (5) Connecting Pipings and the cable to Outdoor unit 1) Connecting the pipings to the Outdoor unit 1. When piping installation work you must be used the 2. Align the center of the pipings and sufficiently tight- connector. en the flare nut by hand Indoor Units Liquid Ø9.52 Ø12.7...
  • Page 61 2) Connection of the cable 1. Room Type Indoor Unit 3. Cassette Type Indoor Unit • Remove the cover control from the unit by loos- • Open the control box cover and connect the Indoor ening the screw. power wires. Connect the wires to the terminals on the control board individually.
  • Page 62 4) Convertible Type 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 63 3) Electrical Wiring Outdoor unit 1. Remove the cover control from the unit by loosen- ing the screw. Terminal block Connect the wires to the terminals on the control Over 5mm board individually as the following. Holder for Terminal on the OUTDOOR UNIT OUTDOOR UNIT power supply cord...
  • Page 64 4. Remote Controller Installationa HOW TO MOUNT ONTO A WALL HOW TO INSERT BATTERIES Remove the battery cover from the remote controller. • Slide the cover according to the arrow direction. • Do not use rechargeable batteries, such batter- ies differ from standard dry cells in shape, dimensions, and performance.

  • Page 65: Checking The Drainage And Pipe Forming

    5. Checking the Drainage and Pipe forming (1) Checking the Drainage 1) Room Type Indoor Unit 1. Remove the Grille from the cabinet • Set the up-and-down air direction louver to open position(horizontally) by finger pressure. • Remove the securing screws. Screw •...
  • Page 66 3) Art Cool Type Indoor Unit • Pour a glass of water on the evaporator. • Ensure the water flows through the drain hose of the indoor unit without any leakage and goes out the drain exit. 4) Convertible Type Indoor Unit 1.
  • Page 67 (2) Form the pipings 1. Wrap the connecting portion of indoor unit with the Insulation material and secure it with two Plastic Bands(for the left pipings). Taping • If you want to connect an additional drain hose, the end of the drain-outlet should keep distance Drain hose from the ground.(Do not dip it into water, and fix it on the wall to avoid swinging in the wind.)
  • Page 68 (3) Heat Insulation 1. Use the heat insulation material for the refriger- ant piping which has an excellent heat-resis- Fastening band (accessory) tance (over 120°C). 2. Precautions in high humidity circumstance: This air conditioner has been tested according to the "KS Standard Conditions with Mist" and Refrigerant piping confirmed that there is not any default.
  • Page 69 (4) 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.
  • Page 70 (5) 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 ~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.

  • Page 71: Test Running

    6. Test Running 1. Check that all tubing and wiring have been properly Bolt connected. 2. Check that the gas and liquid side service valves are fully open. (1) Prepare remote controller Remove the battery cover by pulling it according to the arrow direction.
  • Page 72 CAUTION After the confirmation of the above conditions, prepare the wiring as follows: 1) Never fail to have an individual power specialized for the air conditioner. As for the method of wiring, be guided by the circuit diagram pasted on the inside of control box cover. 2) Provide a circuit breaker switch between power source and the unit.

  • Page 73: Operation

    Operation Room type Indoor Unit 1. Name and Function-Remote Controller(Door Closed) The remote control transmits the signals to the system. START/STOP BUTTON Remote Control Operation starts when this button is pressed and stops when the button is pressed again. Signal transmitter OPERATION MODE SELECTION BUTTON Used to select the operation mode.
  • Page 74 Cassette/Art Cool Type Indoor Unit 1. Name and funcition-Remote Controller (Door Closed) Room type (Chaos) 1. START/STOP BUTTON Operation starts when this button is pressed and stops when the button is pressed again. Cassette type (Auto) 2. OPERATION MODE SELECTION BUTTON Used to select the operation mode.
  • Page 75 2. Name and Function-Remote Control (Door Opened) 1. ON/OFF TIMER BUTTONS Signal transmitter Used to set the time of starting and stopping opera- tion. 2. TIME SETTING BUTTONS Used to adjust the time. 3. TIMER SET/CANCEL BUTTONS Used to set the timer when the desired time is obtained and to cancel the Timer operation.
  • Page 76 Convertible Type Indoor Unit 1. Name and funcition-Remote Controller (Door Opened) OPERATION DISPLAY Displays the operation conditions. START/STOP BUTTON Operation starts when this button is pressed and stops when the button is pressed again. OPERATION MODE SELECTION BUTTON Used to select the operation mode. ON/OFF TIMER BUTTONS Used to set the time of starting and stopping operation.

  • Page 77: Disassembly Of The Parts (Indoor Unit)

    Disassembly of the parts (Indoor unit) (1) Room Type 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. •...
  • Page 78 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. • Unhook the discharge grille and pull the dis- charge grille out from the chassis carefully. 4.
  • Page 79 • Unhook the tab on the right inside of the chas- sis at the same time, slightly pull the evapora- tor toward you until the tab is clear of the slot. 5. To remove the Motor Cover • Remove 2 securing screw. •...
  • Page 80 (2) Art Cool Type Indoor Unit Warning : Disconnect the unit from power supply before making any checks. Be sure the power switch is set to “OFF”. 1. To remove the Grille from the Chassis. - Pull the grille bottom, the remove 2 securing screws.
  • Page 81 3. To remove the Evaporator. - Remove 4 screws securing the evaporator. - Pull the evaporator out from the chassis carefully. 4. Before removing the Turbo Fan. Air Guide - Remove the securing screws from the chassis. Top Cover - Pull the pipe cover, top cover and the air guide. Pipe Cover 5.
  • Page 82 (3) Convertible Type Indoor Unit Warning : Disconnect the unit from power supply before mak- ing any checks. Be sure the power switch is set to “OFF”. 1. Remove the air filter. • Pull the inlet grille slightly toward you. •...
  • Page 83 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 84 6. Remove the front panel. Diffuser frame • Remove the screws of both sides fixing the Diffuser front panel. frame • Push the upper side of front panel strongly to Hook pull out the front panel from the inner hook of diffuser frame.
  • Page 85 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 careful- • Unhook the vanes from the vane supporter and remove the upper vane and lower vane by pulling the center of vanes with care.

  • Page 86: Valve Service(3-Way)

    Valve Service (3-way) 3-way Valve (Liguid Side) 3-way Valve (Gas Side) Valve cap Valve cap Open position Open position Closed position Closed position To piping To piping Service connection Service Service Service connection port cap port port cap port To outdoor unit To outdoor unit Service port Works...

  • Page 87: Pumping Down

    (1) Pumping down Liquid side Indoor unit Outdoor unit 3-way valve Gas side Closed 3-way manifold gauge valve Open 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.
  • Page 88 (2) Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit 3-way valve Gas side Open 3-way valve manifold gauge Vacuum pump Open Low- Hi- handle handle (OPEN) (OPEN) • Procedure 1. Confirm that both the liguid side valve and gas 6.

  • Page 89: Gas Charging

    (3) Gas Charging (After Evacuation) Liquid side Indoor unit Outdoor unit 3-way valve Gas side Closed 3-way valve manifold gauge Charging cylinder Low- Open Hi- handle handle (CLOSE) (OPEN) Check valve • Procedure 1. Connect the gauge to the charging cylinder. - Connect the charge hose which you disconnect- This is different from previous procedures.

  • Page 90: 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 leakage Temp.

  • Page 91: Electronic Parts Troubleshooting Guide

    Electronic Parts Troubleshooting Guide Refer to electronic contorol device drawing & schematic diagram. The Product doesn’t operate at all. Trouble 1 Turn off the main power and wait to 5 seconds Turn on the main power again. Does "Beeping" sound is made from the indoor unit? •...
  • Page 92 Product doesn't operate with the remote controller. Trouble 2 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 93 The Compressor/Outdoor Fan are unable to drive. Trouble 3 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.) When the sensor circuit for Indoor temperature and connector are in bad connection or are...

  • Page 94: When Indoor Fan Does Not Operate

    When indoor Fan does not operate. Trouble 4 Turn off main power. Check the connection of CN-FAN. Check the Fan Motor. Check the Fuse(AC250V, T2A). Check the related circuit of indoor Fan Motor. • The pin No. of micom and the part for driving SSR.(Q01M) •...
  • Page 95 When the vertical louver does not operate. Trouble 5 • 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 •...
  • Page 96 The Outdoor Unit does not operate at all. Trouble 6 Does the Operating LED of indoor unit blink Refer to the self-diagnosis function. when Operation's ON? Is the Connection between CN-Power of Check the connecting state of connector indoor unit and terminal block? Indoor Outdoor Is the connection of cable between indoor...
  • Page 97 When compressor does not operate normally. Trouble 7-1 Communication error between Indoor and Outdoor (Error Code Does the operating LED in display PCB • Check the state of connecting cable Ass'y blink 5 times? (4 line) bewteen indoor and outdoor unit . •...
  • Page 98 When compressor does not operate normally. Trouble 7-2 CT Error (Error Code • Check the state of connecting cable Does the operating LED in Display PCB (3 line) bewteen Indoor and Outdoor Unit . Ass'y blink 8 times? • Check fuse, Noise Filter, PTC, etc. Is the current transformer(CT) in Main PCB Check the PCB pattern(resoldering) Ass'y right?
  • Page 99 When compressor does not operate normally. Trouble 7-3 DC Peak Error(Error Code Does the operating LED in display PCB Ass'y blink 9 times? Is the connecting state of connectors in out- • Electrical wiring diagram (Colors) door Sub. PCB Ass'y right? •...
  • Page 100 When compressor does not operate normally. Trouble 7-4 DC Low Voltage Error (Error Code Does the operating LED in display PCB Ass'y blinks 10 times? Is the connecting state of connectors in out- door PCB Ass'y right? Reconnect the connector. (CN-DC, CN-AC) Is the voltage of capacitor over 187Vdc? Check the wiring state.
  • Page 101 When compressor does not operate normally. Trouble 7-5 High press Error (Error Code Does the operating LED in display PCB Ass'y blink 11 times? Is the installation condition of outdoor unit Check the installation condition. right. Is the indoor/outdoor fan locked? Check the indoor/outdoor fan motor.
  • Page 102 The problem of missing the connector (INDOOR MAIN PCB ASSY) Connectors Condition Problem (error mode) • Malfunctions all indoor & outdoor unit. CN-POWER (1,2) OPEN • Malfunctions remocon, force, test operation mode. • Malfunctions outdoor unit. • Stop compressor and outdoor fan motor. CN-POWER (3) OPEN •...
  • Page 103 The problem of missing the connector (OUTDOOR MAIN PCB ASSY) Condition Problem (error mode) Connectors • Malfunctions outdoor unit. CN-POWER OPEN • Stop compressor and outdoor fan. • Malfunctions outdoor unit. CN-AC • Stop compressor and outdoor fan. OPEN • The operation LED blinks 10 times. •...

  • Page 104: Electronic Control Device

    Electronic Control Device 1. Room Type Indoor Unit • MAIN P.C.B DC ASM • MAIN P.C.B AC ASM - 104 -...
  • Page 105 2. Cassette Type Indoor Unit • MAIN P.C.B DC ASM - 105 -...
  • Page 106 3. Art Cool Type Indoor Unit TOP VIEW BOTTOM VIEW - 106 -...
  • Page 107 4. Convertible Type Indoor Unit - 107 -...
  • Page 108 5. Display ASSY • Room Type Indoor Unit • Convertible Type Indoor Unit • Art Cool Type Indoor Unit TOP VIEW BOTTOM VIEW - 108 -...
  • Page 109 6. SUB P.W.B ASSEMBLY • Art Cool Type Indoor Unit TOP VIEW BOTTOM VIEW - 109 -...
  • Page 110 7. Outdoor Unit • MAIN P.C.B ASM -110-...

  • Page 111: Schematic Diagram

    Schematic Diagram 1. Room Type Indoor Unit - 111 -...
  • Page 112 2. Cassette Type Indoor Unit - 112 -...
  • Page 113 3. Art Cool Type Indoor Unit - 113 -...
  • Page 114 4. Convertible Type Indoor Unit - 114 -...
  • Page 115 5. Outdoor Unit CN-GATE1 CN-GATE2 5 4 3 2 C10K 15uF,450V R21K 1M,1W C09K 471,250V RY-SV RY-4WAY RY-FAN_H RY-FAN_L RY-Power -115-...

  • Page 116: Exploded View And Replacement Parts List

    Exploded View & Replacement Parts List 1. Room Type Indoor Unit (7K, 9K, 12K Btu Models) 135312 152313 135314 152302 131410 733010 359011 342800 159830 159901 668713 268712 346810 35211B 354212 135516 263230 352150 135311 146811-1 146811-2 264110 268714-2 266090 267110 268714-1 W0CZZ...
  • Page 117 Parts List (Indoor Unit) PART No. LOCATION DESCRIPTION REMARKS 131410 CHASSIS ASSEMBLY 3141A20006A 3141A20006A 3141A20005A 135311 GRILLE ASSEMBLY,DISCHARGE 3531A10127B 3531A10127B 3531A10107A 135314 GRILLE ASSEMBLY,INLET SUB 3531A20100X 3531A20100X 3531A10117Y 135316 GRILLE ASSEMBLY,FRONT 3531A20187F 3531A20187F 3531A10208F 135516 COVER ASSEMBLY,MOTOR 3551A20050P 3551A20050P 3551A20099A 146811 MOTOR ASSEMBLY,STEP 4681A20055A...
  • Page 118 2. Room Type Indoor Unit (18K, 24K Btu Models) 135316 267110-1 152313 135314 152302 135511 733010 131410 359011 342800 159830 135311 159901-1 159901-2 668713 268712 346810 35211B 354212 135516 263230 352150 268714-1 146811-1 146811-2 249951 268714-2 W0CZZ - 118 -...
  • Page 119 Parts List (Indoor Unit) PART No. LOCATION DESCRIPTION REMARKS 131410 CHASSIS ASSEMBLY 3141A10002A 3141A10002A 135311 GRILLE ASSEMBLY,DISCHARGE 3531A10116A 3531A10116A 135314 GRILLE ASSEMBLY,INLET SUB 3531A20107X 3531A20107X 135316 GRILLE ASSEMBLY,FRONT 3531A20207B 3531A20207B 135516 COVER ASSEMBLY,MOTOR 3551A20099C 3551A20099C 146811 MOTOR ASSEMBLY,STEP 4681A20055A 4681A20055A 152302 FILTER(MECH),A/C 5230A20001A...
  • Page 120 3. Cassette Type Indoor Unit (AMNN126EA0, AMNN186TEA0) 249951 268714 354212 352114 352118 263230 158591 266012 330870 - 120 -...
  • Page 121 130411 W0CZZ 346810 359011 146811 268712 140570 152312 135802 135312-2 137211 130911 352150 267110 352150 - 121 -...
  • Page 122 Parts List (AMNN126EA0, AMNN186TEA0) Part No. Location No. Description Remarks AMNN126TEA0 AMNN186TEA0 354212 EVAPORATOR ASSY 5421A10007Q 5421A10007F 352114 TUBE ASSY, DISTRIBUTOR 5211A10225A 5211A10225A 352118 TUBE ASSY, MANIFOLD 5211A20241Q 5211A20241Q 158591 PUMP ASSY, WATER 5859A20001C 5859A20001C 266012 SWITCH ASSY, FLOAT 6601A20001F 6601A20001F 330870 DRAIN PAN ASSY...
  • Page 123 4. Art Cool Type Indoor Unit (AMNN096APA0, AMNN126APA0) - 123 -...
  • Page 124 Parts List(AMNN096APA0) PART No. LOCATION DESCRIPTION REMARKS Blue Wood Metal 131410 CHASSIS ASSEMBLY 3141A20004B 135311-1 GRILL ASSEMBLY, DISCHARGE(INDOOR) 3531A20069E 135311-2 GRILL ASSEMBLY, DISCHARGE(INDOOR) 3531A20069D 135311-3 GRILL ASSEMBLY, DISCHARGE(INDOOR) 3531A20069F 135312 GRILL ASSEMBLY, FRONT(INDOOR) 3531A10161B 3531A10161C 3531A10161A 135303 GRILL INLET 3530A10071B 3530A10071C 3530A10071D 135314...
  • Page 125 Parts List(AMNN126APA0) PART No. LOCATION DESCRIPTION REMARKS Blue Wood Metal 131410 CHASSIS ASSEMBLY 3141A20004B 135311-1 GRILL ASSEMBLY, DISCHARGE(INDOOR) 3531A20069E 135311-2 GRILL ASSEMBLY, DISCHARGE(INDOOR) 3531A20069D 135311-3 GRILL ASSEMBLY, DISCHARGE(INDOOR) 3531A20069F 135312 GRILL ASSEMBLY, FRONT(INDOOR) 3531A10161B 3531A10161C 3531A10161A 135303 GRILL INLET 3530A10071B 3530A10071C 3530A10071D 135314...
  • Page 126 5. Convertible Type Indoor Unit (AMNN186VBA0) - 126 -...
  • Page 127 Parts List(AMNN186VBA0) Location No. Description Part No. Remarks 130911 CABINET ASSY 3091AP2533A 135314 GRILLE ASSY, INLET SUB 5237AP2817B 137213 PANEL ASSY, SIDE 3720AP2767P 137213 PWB(PCB) ASSY, MAIN 6871A20042W 146811 MOTOR ASSY, STEP 4681AR2727G 152302 FILTER(MECH), A/C 5230AP7093A 159911 VANE ASSY, HORIZONTAL 5991AP2867B 159911 VANE ASSY...
  • Page 128 6. Outdoor Unit (A2UN186FA0/A3UN216FA0) - 128 -...
  • Page 129 Outdoor Unit Parts List (A2UN186FA0/A3UN216FA0) PART No. LOCATION DESCRIPTION REMARKS A2UN186FA0 A3UN216FA0 137213-1 PANEL ASSEMBLY, SIDE 1A00201D 1A00201D 137213-2 PANEL ASSEMBLY, SIDE 3A02284W 3A02284W 263230-4 THERMISTOR ASSEMBLY 6323A20002Q 6323A20002Q 263230-3 THERMISTOR ASSEMBLY 6323A20002R 6323A20002R 263230-2 THERMISTOR ASSEMBLY 6323AQ3226K 269310-1 THERMISTOR ASSEMBLY...
  • Page 130 Outdoor Unit (A4UN306FA0) - 130 -...
  • Page 131 Outdoor Unit Parts List (A4UN306FA0) Location No. Description Part No. Remarks 137213-1 PANEL ASSEMBLY, SIDE 1A00202F 137213-2 PANEL ASSEMBLY, SIDE 3A02284X 263230-1 THERMISTOR ASSEMBLY 6323A20001A 263230-3 THERMISTOR ASSEMBLY 6323A20002S 263230-6 THERMISTOR ASSEMBLY 6323A20002Z 263230-4 THERMISTOR ASSEMBLY 6323AQ3226L 263230-5 THERMISTOR ASSEMBLY 6323AQ3226M 263230-2 THERMISTOR ASSEMBLY...
  • Page 132 August, 2003 Printed in Korea P/No.: 3828A20097N...

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