LG LP-8091PC Service Manual
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LG LP-8091PC Service Manual

LG LP-8091PC Service Manual

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Библиотека СОК 
Package
Air Conditioner
SERVICE MANUAL
MODEL: LP-8091PC

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Summary of Contents for LG LP-8091PC

  • Page 1 Библиотека СОК  Package Air Conditioner SERVICE MANUAL MODEL: LP-8091PC...

  • Page 2: Table Of Contents

    Contents 1. Preface ..........................3 2. Wiring Diagram........................7 3. Dimensions ..........................8 4. Operation Details ........................9 5. Installation .........................11 6. Operation ...........................23 7. 3-Way Valve........................24 8. Troubleshooting Guide .....................31 9. Electronic Control Device....................42 10. Schematic Diagram ......................44 11. Exploded View and Replacement Parts List..............45 –2–...

  • Page 3: Preface

    1. Preface This service manual provides various service information, containing the mechanical and electrical parts and etc. This package air conditioner was manufactured and assembled under the strict quality control system. The refrigerant is charged at the factory. Be sure to read the safety precautions prior to servicing the unit. 1.1 Safety Precautions ①...
  • Page 4 1.3 Product Specifications MODEL LP-8091PC POWER SOURCE (ø, V, Hz) 3, 220, 60 COOLING CAPACITY Btu/h 71,400 20,927 INPUT 9,500 CURRENT 27.6 MAKER COPELAND TYPE RECIPRO COMPRESSOR MODEL QR90K2-ES8 INPUT 9,500 CAPACITY Kcal/h 91,000 NOISE INDOOR dB(A) LEVEL(1m) OUTDOOR INDOOR...
  • Page 5 1.4 Functions Indoor Unit Power Switch ON/OFF Operation Mode Control • Cooling, Fan Cooling Model Sensing the room temperature • Room temperature sensor (Thermistor) Controlling the room temperature • Maintains the room temperature in accordance with the setting temperature. Starting Current Control •...
  • Page 6 Outdoor Unit Outdoor Fan Speed Control • One speed Sensing discharge pressure for compressor • Discharge pressure sensor(High Pressure Switch) –6–...

  • Page 7: Wiring Diagram

    2. Wiring Diagram Indoor Unit MAIN PCB ASM CONNECT TO CONTACT ROOM "R", "T" OF OUTDOOR TERMINAL BLOCK "A"(1ø,220V) FUSE (10A) SUB PCB ASM FUSE 250V T3.15L NOTE INDOOR OUTDOOR BLUE BLACK WHITE FIELD WIRING BROWN YELLOW ORANGE GREEN P/No.:3854AP2687R GN/YL GREEN/YELLOW ROOM TH...

  • Page 8: Dimensions

    3. Dimensions Indoor Unit Air outlet vent Window display Liquid side piping hole Air inlet vent Connecting cable and liquid/gas side piping hole Drain hole Earth screw Outdoor Unit Air Outlet Vent Air Inlet Vent 95 80 1245 –8–...

  • Page 9: Operation Details

    4. Operation details The function of main control 1. Time Delay Safety Control • 3min ... The compressor is ceased for 3 minutes to balance the pressure in the refrigeration cycle. (Protection of compressor) • 3sec ... The indoor fan is ceased for 1~3 seconds to prevent relay noise. (Protection of fan relay and micro chip) 2.
  • Page 10 5. Off Timer Function This function is to set the time of stopping the unit operation. The procedure is as the following. 1st: Press the timer set button on the Remocon. 2nd: The buzzer sounds and then the display window shows the Off-Time to be set as 1:00→ ... → 7:00 →0:00. - The Off-Time is shifted as the following by each press.

  • Page 11: Installation

    5. Installation 5-1. Installation of Indoor, Outdoor unit 1) Selection of the best location Indoor unit 100cm • There should not be any heat source or steam near the unit. • There should not be any obstacles to prevent the air circulation.
  • Page 12 2) Indoor Unit installation 3) Outdoor unit Installation The mounting floor should be strong and solid Install the outdoor unit on the concrete or any enough to prevent it from vibration. solid base securely and horizontally. Drill the piping hole with 70mm diameter hole- If there is any vibration transmitted to the build- core drill at either the right or the left of indoor ing, mount the rubber underneath the outdoor...
  • Page 13 5-2. Installation Method 1) Procedure Installation works Descriptions Preparation of tools and installation parts Preparation of installation Flaring the pipes To insert the flare nuts, mounted on the connection parts of both indoor and outdoor unit, onto the copper pipes. Pipe bending To reduce the flow resistance of refrigerant.
  • Page 14 2) Preparation of installation parts and tools Installation Parts, Tools Pipe cutter (MAX 35mm Copper pipe) Cutting the pipings Remear Remove burrs from cut edges of pipes. Wrench (H5, H4 hexagonal wrench) To open the service valve Pipe bender Bending the pipings Leak detector Check a gas-leakage of connecting part of the pipings...
  • Page 15 5-3. Piping of Indoor Unit 1) Preparation of piping Cut the pipes and the cable • Use the accessory piping kit or the pipes purchased locally. Pipe cutter • Measure the distance between the indoor and the outdoor unit. • Cut the pipes a little longer than measured Slanted Rough 90°...
  • Page 16 3) Precautions in bending If it is necessary to bend or stretch the tubing, Spring use the spring which is attached to the tubing in stead of pipe bender. • Please make a careful notice to make a smooth R70mm line.
  • Page 17 5-6. Power Supply and Wiring The unit is completely wired internally at the factory MODEL Circuit breaker capacity according to general rule of electrical technology, but local rules, if they are required, should be complied with. (BTU/h) 1) Power Supply ③...
  • Page 18 5-7. Air Purging of the Piping and Indoor Unit The air which contains moisture and which remains in the Refrigeration cycle may cause a malfunction on the Outdoor unit compressor. ① Remove the caps from the 4-way(liquid side) Service port cap and 4-way(gas side) valves.
  • Page 19 ⑦ Set the both 3-way(liquid side) and 3-way(gas side) valves to open position with the Hexagonal wrench for the unit operation. ⑧ Checking a gas leakage for the left piping • Connect the manifold gauge to the service port of 3-way(gas side) valve. Measure the pressure.
  • Page 20 5-8. Checking the Drainage and Form the Piping 1) Checking the Drainage ① Remove the inlet grille. ② Check the drainage. • Pour a glass of water into the drain pan. • Ensure if water flows drain hose of indoor unit. –20–...
  • Page 21 2) Form the Piping ① Wrap the connecting portion of indoor unit with the Main cable insulation material and secure it with two Plastic Gas side piping Bands. (for the right piping) • If you connect an additional drain hose, the end of Connecting Cable the drain-outlet should be kept distance from the (For heater)
  • Page 22 5-9. Final Check and Test Run After installing the unit, perform the final check and run- Running test should be accomplished as follows: ning test as follows: Final check points ① Set operation switch at "FAN" and the fan will start.

  • Page 23: Operation

    6. Operation Display Auto Airflow Direction Cpntrol Button and Lamp Timer Setting Button and Lamps (Oeration stops at ON) Start/Stop Button (Operation will start when this button is pressed, and stop when the button is pressed again) Temperature/Time Display Window Temperature Setting Buttons Indoor Fan Speed Selector (To select the desired fan speed in two...

  • Page 24: Way Valve

    7. 3-Way Valve 3-Way Valve (Liquid Side) 3-Way Valve (Gas Side) Valve cap Valve cap Open position Open position Flare nut Flare nut Closed position Closed position piping piping Service Service Service Service connection connection port cap port cap port port To outdoor unit To outdoor unit...
  • Page 25 7-1. Air purging Required tools: hexagonal wrench, adjustable wrench, torque wrench, and gas leak detector. The additional gas for air purging has been charged in the outdoor unit. However, if the flare connections have not been done correctly and there gas leaks, a gas cylinder and the charge set will be needed.
  • Page 26 7-2. Pump down Liquid side Indoor unit Outdoor unit Closed 3-Way valve Gas side Open 3-Way valve CLOSE CLOSE Purge the air • Procedure ⑤ Set the 3-way(liquid side) valve to the closed ① Confirm that both 3-way(liquid side) and 3- position.
  • Page 27 1) Re-airpurging (Re-installation) Liquid side Indoor unit Closed 3-Way Outdoor unit valve Gas side Closed 3-Way valve Gas cylinder OPEN CLOSE • Procedure ① Confirm that both the 3-way (liquid side) valve ⑤ Discharge the refrigerant. and the 3-way(gas side) valve are set to the •...
  • Page 28 2) Balance refrigerant of the 3-way(liquid side), 3-way(gas side) valves (Gas leakage) Liquid side Indoor unit Outdoor unit 3-Way valve Open Gas side 3-Way valve Open OPEN CLOSE • Procedure ① Confirm that both the liquid side and gas side valves are set to the back seat. ②...
  • Page 29 7-3. Evacuation (All amount of refrigerant leaked) Liquid side Indoor unit Outdoor unit 3-Way valve Open Gas side 3-Way valve Open Vacuum pump OPEN CLOSE • Procedure ① Connect the vacuum pump to the center hose of charge set. ② Evacuation for approximately one hour. - Confirm that the gauge needle has moved toward -76cmHg (vacuum of 4 mmHg or less).
  • Page 30 7-4. Gas Charging 1) Cooling mode (After Evacuation) Liquid side Indoor unit Outdoor unit Open 3-Way valve Gas side Open 3-Way valve Check valve Charging cylinder OPEN CLOSE • Procedure ① Connect the charge hose to the charging cylinder. This is different from previous procedures. •...

  • Page 31: Troubleshooting Guide

    8. Troubleshooting Guide In general, possible trouble is classified as two causes. The one is so called Starting Failure which is caused from an electrical defect, and the other is Ineffective Air Conditioning caused by a defect in the refrigeration circuit and improper application. Unit runs but ineffective cooling Ineffective Cooling Check of cold (warm) air cir-...
  • Page 32 Failures to Start Check power source. Check of circuit breaker and fuse. Check control switch Check control switch. setting. Compressor only fails to Fan only fails to start start Electric heater is not energized Improper wiring Drop of power voltage Loose terminal connection.
  • Page 33 PACKAGE AIR CONDITIONER VOLTAGE LIMITS NAME PLATE RATING MINIMUM MAXIMUM 220V 198V 242V 8-1. No cooling operation performed 1) Both the blower and the compressor do not work WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY Other parts than the unit Electric supply interrupted Measure it with a tester in Repair a switch box and...
  • Page 34 3) Only outdoor fan does not work WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY Motor Over-heated Check how it is insulated. Repair or replace it. Layer short Electric Wiring Open wire on operation Check it with a tester. Rewiring or repair. Short circuited on operation 4) Only compressor does not work...
  • Page 35 8-2. The Units discontinue after the operation started WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY Other parts than the unit Improper opening of the Checking Open it properly service valves in the refrigerant line Wash it by means of Checking Outdoor coil Coil is dirty *1 something like chemical...
  • Page 36 8-3. The unit is working, but not cooling sufficiently (Both blower and compressor are working) WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY Load Much heat load Heat load increased. Do necessary disposal Window or door has respectively. many cracks or gaps. Air flow Obstacle disturbs Intake Correct it.
  • Page 37 WHAT TROUBLED COMPLAINTS HOW TO CHECK REMEDY Electric troubles Defective contact. Checking Repair and clean or (Magnetic Defective contact point. replace it. contactor) Rusting and faults in the iron core contact face. Defective contact of the operating switch. Correct it. Others Improper installation Checking...
  • Page 38 Fault Cause Check/Correcitve Action Discharge pressure is lower than standard. See "Low Discharge Pressure". Check the power supply line and the Single or three phases running. contactor. High or low voltage or phase unbalance. Check the voltage and phase unbalance. Internal Refrigerant short charge or leakage.
  • Page 39 8-6. Electronic Parts Troubleshooting Guide 1) No cooling operation performed. Is the AC220V (AC 240 V) between Connector(CN- outunit) of Main P.C.B Is the input power AC220V (AC240V) at COMP Magnetic coil? Is the unit operating? Check the magnetic Check the wiring contactor of outdoor unit.
  • Page 40 2) Indoor fan does not operate. Is the unit operating? ON/OFF S/W ON Is the DC5V at 20 pin of MICOM? Is the DC5V at 21 pin of MICOM? Replacement MICOM and check the EVA-Th Is the DC12V at each Is the DC12V at each terminal of RY1 coil of terminal of RY2 of SUB...
  • Page 41 3) The unit does not operate. Is the AC220V 1. Check the electric connections (240V) at Trans input terminal? 2. Check the fuse of Main PCB ASM Is the AC12-18V at Replacement Trans Trans (2nd)? Is the connector of Check the connector of Main/Display correct? Main/Display Is the DC5V between PIN64...

  • Page 42: Electronic Control Device

    9. Electronic Control Device 9-1. MAIN P.C.B ASSY –42–...
  • Page 43 9-2. SUB P.C.B ASSY RY1 (HIGH) PWB: 6870AQ2241 ASM: 6871AQ2242 CN-MOTOR CN-RELAY RY2 (MIDDLE) CN-INPUT RY3 (LOW) FUSE 250V/T10A –43–...

  • Page 44: Schematic Diagram

    10. Schematic Diagram Circuit and Troubleshooting –44–...

  • Page 45: Exploded View And Replacement Parts List

    11. Exploped View and Replacement Parts List Indoor Unit 18-2 18-1 –45–...
  • Page 46 –46–...
  • Page 47 DESCRIPTION Part No. QUANTITY REMARKS BASE WELD ASM 3A02381Q SIDE PANEL ASM 3A02491C SIDE PANEL ASM 3A02491D PANEL REAR-L ASM 3A02492B PANEL REAR-U ASM 3A02493A DECO LINE 2E92124C COVER GRILLE 2E92122H TOP COVER ASM 3A02480B 8/8-1 RACK BARRIER 3A02377A/B MOTOR BLOWER(IN) 2A01239F MOUNT ASM 3A00429A...
  • Page 48 DESCRIPTION PART No. QUANTITY REMARKS DISPLAY SHEET 3544AP2358A HOLDER DISPLAY 1A00278B DISPALY PCB ASM 6871AQ2163A FRONT PANEL 2A01188A COVER CONTROL ASM 3E92319B DECO LINE-L 2E92123A GRILLE ASM 1A00292A PLENUM GRILLE 3G00663W SUPPORT VANE 2G00147B LOUVER VERTICAL 3A02372A GROLLE FRAME 2E92118A SYNCHRONOUS MOTOR 2H01102A LINK VERTICAL...
  • Page 49 Outdoor Unit –49–...
  • Page 50 DESCRIPTION PART No. QUANTITY REMARKS BASE ASSY 3041AP2606W COMPRESSOR 2A01180C 5403AP2618H 5403AP2618H CONDENSER ASSY 5403AP2618H 5403AP2618H LINK SHEET 4520AP4095A BRACKET COND 4810A30028A TUBE ASSY, (MANIFOLD IN) 5211A30050A TUBE ASSY, (MANIFOLD IN) 5211A30050B TUBE ASSY, (MANIFOLD OUT) 5211AP3868A TUBE ASSY, (MANIFOLD OUT) 5211AP3868B MESH(COVER FIN) 2A00191R...
  • Page 51 DESCRIPTION PART No. QUANTITY REMARKS FAN LOCKER 4A01387A SPRING LOCK WASHER 1WSD1000030 HEXAGON NUTS 1NHA1001206 GRILLE COVER 2A00144P 34-1 PANEL ASSY FRONT 3721AP2913P 34-2 PANEL ASSY FRONT 3721AP2913Q COVER ASSY CONTROL 3551AP7047Z PANEL INSTALL-U 3720AP3810P BRACKET INSTALL-L 3720AP3814P BRACKET F.P 4810AP7078A COVER FAN 3550AP3912A...
  • Page 52 April, 2000 P/No.: 3828A30074W Printed in Korea...

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