LG FMN0760NL Service Manual
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LG FMN0760NL Service Manual

LG FMN0760NL Service Manual

Free joint multi type
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Free Joint Multi Type

Air Conditioner

SERVICE MANUAL

MODELS
Indoor Unit
: FMN0760NL
FMN0960NL
FMN1260NL
FMN1260NFM/B/D
FMN1260NT
FMN1860NT
FMN1860NV
FMN1860NL
Outdoor Unit : FMU4480N6L

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Summary of Contents for LG FMN0760NL

  • Page 1: Air Conditioner

    Free Joint Multi Type Air Conditioner SERVICE MANUAL MODELS Indoor Unit : FMN0760NL FMN0960NL FMN1260NL FMN1260NFM/B/D FMN1260NT FMN1860NT FMN1860NV FMN1860NL Outdoor Unit : FMU4480N6L...
  • Page 2 Contents Functions............................3 Product Specifications .........................5 Operation Details ..........................7 Dimensions..........................23 Wiring Diagram ...........................27 Self-diagnosis Function ......................29 Refrigeration Cycle Diagram......................30 Installation of Indoor, Outdoor Unit ..................31 Disassembly of the parts ......................70 3-way Valve ..........................76 Cycle Troubleshooting Guide ....................81 Electronic Parts Troubleshooting Guide...................82 Electronic Control Device ......................93 Schematic Diagram........................101 Exploded View and Replacement Parts List................107...

  • 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: Mode

    Outdoor Unit Power relay control • If power is on, it will operate to charge capacitor (330µF/450WV) on controller and power relay will oper- ate after about 2~5sec. 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: Product Specifications

    Product Specifications Indoor Unit FMN0760NL FMN0960NL FMN1260NL FMN1260NFM/B/D Model Item Outdoor Unit FMU4480N6L 7,000 9,000 12,000 12,000 Indoor [Btu/h] Cooling capacity 2,051 2,638 3,517 3,517 Unit [Btu/h] 8,000 10,000 13,800 13,800 Heating capacity 2,344 2,931 4,044 4,044 Moisture Removal [l/h] Power Supply [Ø,V,Hz]...

  • Page 6: Mode

    Indoor Unit FMN1260NT FMN1860NT FMN1860NL FMN1860NV Model Item Outdoor Unit FMU4480N6L Indoor [Btu/h] 12,000 18,000 18,000 18,000 Cooling capacity Unit 3,517 5,275 5,275 5,275 13,800 20,700 19,000 20,700 [Btu/h] Heating capacity 4,044 6,067 5,567 6,067 Moisture Removal [l/h] Power Supply [Ø,V,Hz] 1, 220-240, 50 1, 220-240, 50 1, 220-240, 50 1, 220-240, 50...

  • Page 7: 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 8: Mode

    • 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 9: Mode

    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 10: Sleep Timer Operation

    I 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. I 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 11: Forced Operation

    I 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 12: Mode

    2. Cassette Type Indoor Unit (1) The function of main control I 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 13 I 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 14: Defrost Control

    I 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 15 3. Convertible Type Indoor Unit (1) The function of main control I 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 16 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 17 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 18 • 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 19 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 20 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 21: 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 22 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 Soft Dry...

  • Page 23: Dimensions

    Left rear piping Right rear piping Left rear piping Right rear piping Left rear piping Right rear piping "D" "C" 80mm 50mm Hole Center ø70mm ø70mm ø70mm ø70mm ø70mm FMN0760NL, FMN0960NL FMN1260NL FMN1860NL MODEL FMN0760NL FMN1260NL FMN1860NL FMN0960NL 1,080 - 23 -...
  • Page 24 • Art Cool Type Indoor Unit Hanger Hole Fix Hole Pipe Hole MODEL INDOOR UNIT Unit - 24 -...
  • Page 25 • Convertible Type Indoor Unit 1 2 0 0 m m 205mm 63mm 38mm 175mm (Installation Plate) 250mm (Rear Side) - 25 -...
  • Page 26 • Cassette Type Indoor Unit CLOSE OPEN OPEN CLOSE 2. Outdoor Unit 1,225 - 26 -...

  • Page 27: Wiring Diagram

    Wiring Diagram 1. Room Type Indoor Unit 2. Art Cool Type Indoor Unit FORCED MAIN PCB OPERATION MAIN PCB ASSY AUTO RESTART REMOTE CONTROL MOTOR MOTOR THERMISTOR STEP SH-CAPA. MOTOR STEP MOTOR FUSE AC250V/T2A FUSE STEP 250V 3.15A MOTOR 1(L) 2(N) STEP MOTOR CN-D1...

  • Page 28: Outdoor Unit Wiring Diagram

    5. Outdoor Unit (FMU4480N6L) BRIDGE Outdoor Unit Wiring Diagram DIODE REACTOR 800V 0.27uF 100K,2W 1(L) 2(N) UNIT 100K,2W 3(A) 1(L) 2(N) UNIT 3(B) 1(L) 2(N) UNIT CN-IPM GATE1 RY-FAN1(LOW) 3(C) GATE2 1(L) RY-FAN1(HIGH) 2(N) UNIT CAPACITOR CN-DATA CN-FAN1 3(D) RY-FAN2(LOW) 1(L) 2(N) UNIT...

  • Page 29: Self-Diagnosis Function

    Self-diagnosis Function I Error Indicator • The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble. • Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table. •...

  • Page 30: Refrigeration Cycle Diagram

    Refrigeration Cycle Diagram 1. FM-4480N6L (Cooling & Heating modes) Outdoor Unit Indoor Unit Heat Exchanger Heat Exchanger 3-WAY 4-WAY Valve Valve Comp Cooling & Deice Heating Pipe Size Max. Elevation Max. length Standard Length Additional Refrigerant (g/m) LIQUID 9.52mm(3/8") 6.35mm(1/4") 12.7mm(1/2") 6.35mm(1/4") 15.88mm(5/8")

  • Page 31: Installation Of Indoor, Outdoor Unit

    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 32 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 33: 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 34: 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 35: The Indoor Unit Installation

    The lower left and the right side of • Line according to the arrows marked on lower Installation Plate the left and the rght side of the Installation Plate. FMN0760NL, FMN0960NL The meeting point of the extended line is the center of the hole. Left rear piping Right rear piping •...
  • Page 36 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 37 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 38 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 39 (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 40 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 for installation...
  • Page 41 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 42 (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 43: 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 44 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 45 • 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 46 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 47 (4) Convertible Type Indoor Unit I 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 48 • 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 49 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 50 • 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 55. • Hook up the Inlet Grille Hook to the cabinet. Inlet hanger •...
  • Page 51 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 52 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 53 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 54 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 55 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 56 (5) Connecting Pipings and the cable to Outdoor unit 1) Connecting the pipings to the Outdoor 1) 7K, 9K, 12K, 18K Liquid side unit 1. Align the center of the pipings and sufficiently tighten the flare nut with fingers. 2. Finally, tighten the flare nut with torque 7K, 9K Gas side wrench until the wrench clicks.
  • Page 57 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 58 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 59 3) Electrical Wiring 1. All wiring must comply with LOCAL REGULATIONS. 2. Select a power source that is capable of supplying the current required by the air conditioner. 3. Feed the power source to the unit via a distribution switch board designed for this purpose. 4.
  • Page 60 4. Remote Controller Installationa (1) Remote Control Preparation HOW TO MOUNT ONTO A WALL HOW TO INSERT BATTERIES Remove the battery cover from the remote controller. • Do not use rechargeable batteries, such batter- • Slide the cover according to the arrow direction. ies differ from standard dry cells in shape, dimensions, and performance.
  • Page 61 (2) Operation I Room/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 62 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 63 I 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 64: 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 65 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 66 (2) Form the pipings 1. Wrap the connecting portion of indoor unit Seal a small opening with the Insulation material and secure it with around the pipings two Plastic Bands(for the left pipings). Taping with gum type sealer. • If you want to connect an additional drain hose, Drain hose the end of the drain-outlet should keep distance from the ground.(Do not dip it into water, and fix...
  • Page 67 (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 68: 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 69: Hand Over

    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 70: Disassembly Of The Parts

    Disassembly of the parts (1) 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. - Lift the both lower parts of panel front.
  • Page 71 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 72 (2) 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 73 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 74 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 75 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 76: Way Valve

    3-way Valve 3-way Valve (Liguid Side) 3-way Valve (Gas Side) Valve cap Hexagonal wrench Open position (4mm) Closed position piping piping Service Service Service Service connection connection port cap port cap port port To outdoor unit To outdoor unit 15.88mm(5/8") 19.05mm(3/4") Works Shaft position...
  • Page 77 (1) Pumping down Liquid side Indoor unit Outdoor unit Close 3-Way valve Gas side Open 3-Way valve manifold gauge Vacuum pump Low- handle Hi- handle (OPEN) (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 78 (2) Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit Open 3-Way valve Gas side Open 3-Way valve manifold gauge Vacuum pump Low- handle Hi- handle (OPEN) (CLOSE) • Procedure 1. Confirm that both the liguid side valve and gas 6.
  • Page 79 (3) Gas Charging (After Evacuation) Liquid side Indoor unit Outdoor unit Open 3-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. - Connect the charge hose which you disconnect- This is different from previous procedures.
  • Page 80 (4) Air Purging of the Pipings and indoor unit Liquid side Indoor unit Outdoor unit Open 3-way valve Gas side Close 3-way valve Vacuum pump OPEN CLOSE The air which contains moisture remaining in the is refrigeration cycle may cause a malfunction on the compressor.

  • Page 81: Cycle Troubleshooting Guide

    Cycle Troubleshooting Guide (1) 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.

  • Page 82: 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 83 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 84 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 85 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. 38 of micom and the part for driving SSR. •...
  • Page 86 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 87 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? Indoor Outdoor Is the connection of cable between indoor 1(Brown) 1(Brown) and outdoor unit right? 2(Blue) 2(Blue) 3(Green/YL)
  • Page 88 When compressor does not operate normally. Trouble 7-1 I DC Peak Error(Error Code Does the LED02T of outdoor PCB Ass'y Check the state of connecting cable (4 line) blink 9 times? between indoor and outdoor uint. Is the connecting state of connectors in out- •...
  • Page 89 When compressor does not oprate normally. Trouble 7-2 I Communication error between Indoor and Outdoor (Error Code • Check the state of connecting cable Does the operating LED in display PCB (4 line) bewteen indoor and outdoor unit . Ass'y blink 5 times? •...
  • Page 90 When compressor does not oprate normally. Trouble 7-3 I 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 courrent transformer(CT) in Main Check the PCB pattern(resoldering) PCB Ass'y right?
  • Page 91 I The problem of missing the connector (INDOOR MAIN PCB ASSY) Connectors Condition Problem (error mode) • Malfunctions all indoor & outdoor unit. CN-POWER OPEN • Malfunctions remocon, force, test operation mode. (AC2) • Malfunctions indoor fan motor. CN-FAN OPEN CN-DATA OPEN •...
  • Page 92 I The problem of missing the connector (OUTDOOR MAIN PCB ASSY) Condition Problem (error mode) Connectors • Malfunctions outdoor unit. OPEN CN-POWER • Stop compressor and outdoor fan. • The operation LED02T blinks 5 times. • Malfunctions outdoor unit. CN-AC OPEN •...

  • Page 93: Electronic Control Device

    Electronic Control Device 1. Indoor Unit (1)MAIN P.C.B ASM • FMN0760NL, FMN0960NL, FMN1260NL, FMN1860NL - 93 -...
  • Page 94 • FMN1260NT, FMN1860NT - 94 -...
  • Page 95 • FMN1260NFM/B/D TOP VIEW BOTTOM VIEW - 95 -...
  • Page 96 • FMN1860NV - 96 -...
  • Page 97 2. Outdoor Unit • MAIN P.C.B ASM (FMU4480N6L) -97-...
  • Page 98 • PCB(PWB) ASSY, SUB - 98 -...
  • Page 99 3. Display ASSY • FMN1860NV • FMN1260NFM/B/D TOP VIEW BOTTOM VIEW - 99 -...
  • Page 100 4. SUB P.W.B ASSEMBLY • FMN1260NFM/B/D TOP VIEW BOTTOM VIEW - 100 -...

  • Page 101: Schematic Diagram

    Schematic Diagram 1. Indoor Unit • FMN0760NL, FMN0960NL, FMN1260NL, FMN1860NL - 101 -...
  • Page 102 • FMN1260NT, FMN1860NT - 102 -...
  • Page 103 • FMN1260NFM/B/D - 103 -...
  • Page 104 • FMN1860NV - 104 -...
  • Page 105 2. Outdoor Unit • FMU4480N6L CN_TH3 CN_TH2 CN_TH1 5 4 3 2 3 2 1 CN_Test 3 2 1 RC03M RC02M RC01M CN_TH5 CN_TH4 CN_TH3 -105-...
  • Page 106 - 106 -...

  • Page 107: Exploded View And Replacement Parts List

    Exploded View and Replacement Parts List 1. Room Type Indoor Unit • FMN0760NL, FMN0960NL - 107 -...
  • Page 108 Parts List (FMN0760NL, FMN0960NL) Part No. Location No. Description Remarks FMN0760NL FMN0960NL 131410 CHASSIS ASSY 3141A20001D 135312 GRILLE ASSY, DISCHARGE (INDOOR) 3531A10005C 135314 GRILLE ASSY, INLET 3531A10039J 146811 MOTOR ASSY, STEP 6481AR2727H 152301 FILTER ASSY, DEODORIZER 5231AR2412T 152302 FILTER (MECH), A/C...
  • Page 109 FMN1260NL - 109 -...
  • Page 110 Parts List (FMN1260NL) Location No. Description Part No. Remarks 131410 CHASSIS ASSY 3141A20003B 135311 GRILLE ASSY, DISCHARGE(INDOOR) 3531A10023A 135314 GRILLE ASSY, INLET 3531A20059M 146811 MOTOR ASSY, STEP 4681AR2727H 152301 FILTER ASSY, DEODORIZER 5231AR2412T 152302 FILTER(MECH), A/C 5230A20004A 159901-1 VANE, HORIZONTAL 5990A30006B 159901-2 VANE, HORIZONTAL...
  • Page 111 • FMN1860NL - 111 -...
  • Page 112 Indoor Unit Parts List (FMN1860NL) Location No. Description Part No. Remarks 131410 CHASSIS ASSY 3141A20002H 135311 GRILLE ASSY, DISCHARGE(INDOOR) 3531A10008H 135314 GRILLE ASSY, INLET 3531A20062P 146811 MOTOR ASSY, STEP 4681AR2727H 152302 FILTER(MECH), A/C 5230A20001A 152313 FILTER ASSY DEODORIZER 5231AR2595G 159901-1 VANE, HORIZONTAL 5990A30001B 159901-2...
  • Page 113 2. Cassette Type Indoor Unit (FMN1260NT, FMN1860NT) 249951 268711-2 354212 352114 352118 263230 158591 266010 330870 - 113 -...
  • Page 114 130411 W0CZZ 346810 359011 146811 268711-1 140570 152311 135313 137211 130911 352150 267110 352150 - 114 -...
  • Page 115 Parts List (FMN1260NT, FMN1860NT) Part No. Location No. Description Remarks FMN1260NT FMN1860NT 354212 EVAPORATOR ASSY 5421A10007Q 5421A10007F 352114 TUBE ASSY, DISTRIBUTOR 5211A10225A 5211A10225A 352118 TUBE ASSY, MANIFOLD 5211A20241A 5211A20241A 158591 PUMP ASSY, WATER 5859A20001C 5859A20001C 266010 SWITCH ASSY, FLOAT 6601A20001F 6601A20001F 330870 DRAIN PAN ASSY...
  • Page 116 3. Art Cool Type Indoor Unit (FMN1260NFM/B/D) - 116 -...
  • Page 117 Parts List(FMN1260NFM/B/D) PART No. LOCATION DESCRIPTION REMARKS MFN1260NFB MFN1260NFD MFN1260NFM 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 118 4. Convertible Type Indoor Unit (FMN1860NV) - 118 -...
  • Page 119 Parts List(FMN1860NV) 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 120 5. Outdoor Unit - 120 -...
  • Page 121 Parts List (FMU4480N6L) Location No. Description Part No. Remarks 430410 BASE ASSY, WELD 4031AP2569B 554160 COMPRESSOR SET 2520UNCV1AA 553000 HEATER, SUMP 2A00093T 554031-1 CONDENSER ASSY, BENT 5403A20003Z 554031-2 CONDENSER ASSY, BENT 5403A20079B 447910 BARRIER ASSY, OUTDOOR 4791A20012B 349600 MOUNT, MOTOR 4960A10004A 346810-1 MOTOR ASSY, OUTDOOR...
  • Page 122 August, 2002 P/No.: 3828A20208A Printed in Korea...

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