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LG LP090CED LP120CED Service Manual

Packaged terminal air conditioner/heat pump
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See also: Owner's Manual
LG Packaged Terminal
Air Conditioner/Heat Pump

SERVICE MANUAL

http://www.lgservice.com
CAUTION
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• FOR AUTHORIZED SERVICE ONLY.
LG

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Summary of Contents for LG LP090CED LP120CED

  • Page 1: Service Manual

    LG Packaged Terminal Air Conditioner/Heat Pump SERVICE MANUAL CAUTION • BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. • FOR AUTHORIZED SERVICE ONLY.

  • Page 2: Table Of Contents

    CONTENTS 1. PREFACE 2.4.2 EVAPORATOR ........17 2.4.3 CAPILLARY TUBE.......17 1.1 SPECIFICATIONS ..........3 3. INSTALLATION 1.2 FEATURES AND BENEFITS......5 1.3 CONTROL LOCATIONS .........7 3.1 HOW TO INSTALL THE UNIT ......18 1.4 ADDITIONAL CONTROLS......9 3.2 SUGGESTED TOOL REQUIREMENTS ..20 2. DISASSEMBLY INSTRUCTIONS 3.2.1 PREPARATION OF SLEEVE ....21 3.2.2 PREPARATION OF THE FRONT 2.1 MECHANICAL PARTS........11...

  • Page 3: Specifications

    1.1 SPECIFICATIONS LP 12 0 C E M 1 12 34 5 6 7 8 9 Digits 1,2 - LG Packaged Terminal Air Conditioner Digit 6 - Product Type Digits 3,4 - Unit Cooling Capacity C = Air Conditoner 07 = 7,000 Btu/h...
  • Page 4 MODELS LP090HED LP120HED LP150HED ITEMS POWER SUPPLY 1Ø, 230/208V, 60Hz 1Ø, 230/208V, 60Hz 1Ø, 230/208V, 60Hz COOLING CAPACITY (Bru/h) 9,100/8,900 12,100/11,800 14,300/14,100 INPUT (W) 775/760 1,090/1,065 1,460/1,440 RUNNING CURRENT (A) 3.7/3.9 5.0/5.4 6.5/7.3 E.E.R. (Btu/h.W) 11.7/11.7 11.1/11.1 9.8/9.8 HEATING CAPACITY (Bru/h) 8,200/8,000 10,900/10,700 13,500/13,300...

  • Page 5: Features And Benefits

    This feature extends the overall life of compressor by preventing the short-cycling of the air-conditioner. When the compressor restarts, LG PTAC is designed to give a minimum of three minutes to have a time of equalizing the refrigerant pressures for optimizing cycling.
  • Page 6 The unit will activate the reverse cycle defrost when the outdoor coil temperature has remained at a cold temperature to form the ice on the coil.This ice will reduce airflow though the coil and will also reduce the efficiency of unit. The LG PTHP will employ an active reverse cycle defrost function to melt the ice off the outdoor coil for insuring room comfort conditions and savings from extended operation.

  • Page 7: Control Locations

    1.3 CONTROL LOCATIONS • OPERATION ELECTRIC HEATING MODEL COOLING ONLY MODEL TEMPERATURE CONTROL OPERATION MODE SELECTOR Set the Thermostat control to the desired temperature Turns air conditioner off. mark 5 (the mid-point is a good starting position). If the LOW FAN Low speed fan operation without cooling.

  • Page 8: Electronic Controls

    • ELECTRONIC CONTROLS The controls will look like one of the following. FAN SPEED • Every time you push this button, it cycles through the settings as follows: {High(F2) ¡ Low(F1) ¡ High(F2) ¡ Low(F1)} E/SAVE HEAT HIGH HIGH POWER COOL COOL TIMER...

  • Page 9: Additional Controls

    1.4 ADDITIONAL CONTROLS • REMOVING THE FRONT GRILLE Additional controls are available after removing the front grille and option cover of control box. To remove the front grille, pull out the bottom of front grille and then lift up. To replace the front grille, place the tabs over the top of the unit and push the bottom of front grille until the clips snap into place.

  • Page 10: Energy Saver

    • REMOTE/LOCAL CONTROL When remote/local switch #1 is on, it allow the unit to operate by the control of Remote Wall Thermostat. The unit control by knobs are not available. • ENERGY SAVER The energy saver switch #2 is on. This switch is set at cycle fan to provide continuous fan operation in cool or heat modes. When the switch is off the continuous fan allows continuous circulation of room air and make the more balanced temperature of the room.

  • Page 11: Disassembly Instructions

    2. DISASSEMBLY INSTRUCTIONS — Before the following disassembly, POWER SWITCH is set to OFF and disconnected the power cord. 2.1 MECHANICAL PARTS 2.1.1 FRONT GRILLE 1. Remove the front grille. (See Figure 1) 2. To remove the front grille, pull out the bottom of the front grille and then lift up.

  • Page 12: Control Box

    2.1.2 CONTROL BOX 1. Remove the front grille. (Refer to section 2.1.1) 2. Remove the two screws which fasten the control box. (See Figure 2) 3. Pull the control box from the Air guide. Figure 2 4. Remove the control box cover. (See Figure 3) 5.

  • Page 13: Air Handling Parts

    2.2 AIR HANDLING PARTS 2.2.1 ELECTRIC HEATER (ELECTRIC HEATER MODEL ONLY) 1. Remove the front grille.(Refer to section 2.1.1) 2. Remove the control box assembly. (Refer to section 2.1.2) 3. Remove the 4 screws which fasten the Evaporator. Figure 5 (See Figure 5) 4.

  • Page 14: Cross Flow Fan

    2.2.2 CROSS FLOW FAN 1. Remove the front grille. (Refer to section 2.1.1) 2. Remove the control box assembly. (Refer to section 2.1.2) 3. Remove the Air-Guide Assembly from the unit. (Refer to section 2.2.1) 4. Loosen the screw on the cross flow fan. (See Figure 9) Figure 9 5.

  • Page 15: Shroud

    2.2.4 SHROUD 1. Remove the axial fan. (Refer to section 2.2.3) 2. Remove the 4 screws which fasten the condenser with the shroud and the basepan. (See Figure 11) 3. Remove the shroud. 4. Re-install the component by referring to the removal procedure.

  • Page 16: Power Cord

    2.3.5 POWER CORD 1. Remove the control box. (Refer to section 2.1.2) 2. Disconnect the grounding screw from the control box. 3. Disconnect 2 receptacles. 4. Remove a screw which fastens the clip cord. 5. Separate the power cord from the control box. (See Figure 17) 6.

  • Page 17: Refrigeration Cycle

    2.4 REFRIGERATION CYCLE CAUTION Discharge the refrigerant system using a refrigerant recovery system. If there is no valve to attach the recovery system, install one (such as a WATCO A-1) before venting the refrigerant. Leave the valve in place after servicing the system. 2.4.1 CONDENSER 1.
  • Page 18 NOTES — Replacement of the refrigeration cycle. 1. When replacing the refrigeration cycle, be sure to 6. Recharge as follows : discharge the refrigerant system using a 1) Refrigeration cycle systems are charged from the refrigerant recovery system. high-side. If the total charge cannot be put If there is no valve to attach the recovery system, in the high-side, the balance will be put in the install one (such as a WATCO A-1) before venting...
  • Page 19 Equipment needed: Vacuum pump, charging cylinder, manifold gauge, brazing equipment. pinch-off tool capable of making a vapor-proof seal, leak detector, tubing cutter, hand tools to remove components, service valve. Figure 16 A-Pulling Vacuum Figure 16 B-Charging —19—...

  • Page 20: Installation

    3. INSTALLATION Dimension of air conditioner 3.1 HOW TO INSTALL THE UNIT 1,066 mm CAUTION (42") • There are sharp edges that can cause serious cuts. • When lifting the air conditioner, it is HEAVY. Use 2 people to lift. 406 mm For existing sleeve, you should measure the wall sleeve (16")

  • Page 21: Suggested Tool Requirements

    3.2 SUGGESTED TOOL REQUIREMENTS SCREWDRIVER (FLAT and PHILLIPS), RULER, KNIFE, HAMMER, PENCIL, LEVEL 3.2.1 PREPARATION OF SLEEVE SLEEVE HARDWARE NUMBER NAME OF PARTS Q’TY LOVER SLEEVE UPPER SLEEVE SCREW OUTDOOR GRILLE DRAIN KIT ASSEMBLE THE WALL SLEEVE • Raise the sleeve side panels to upright position as shown on the right.

  • Page 22: Unit Installation

    3.2.3 UNIT INSTALLATION 1. Remove the shipping screw from the ventilation door. (See Figure 17) Figure 17 2. Remove the front gille by pulling it out at the bottom to release it, then lift it up along the unit top front. (See Figure 18) Figure 18 3.

  • Page 23: Electrical Requirements

    3.3 ELECTRICAL REQUIREMENTS 3.3.1 ELECTRICAL DATA (FOR 230/208V MODEL) CAUTION 1. Do not use an extension cord with this unit. Tandem 2. When the unit is in the OFF position, the power supply to the 15 A electrical controls is still energized. 3.

  • Page 24: Field Installed Accessories

    4. FIELD INSTALLED ACCESSORIES Note: The installation and servicing of this equipment must be performed by qualifieed. experienced technicians NOTICE: Warnings and Cautions appear at appropriate sections throughout this manual. Read these carefully. WARNING - Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. CAUTION - Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.
  • Page 25 Condensate Disposal Pump Kit 2. Unplug and remove the PTAC chassis from the wallsleeve. Installation Move the chassis where the front and back of the chassis can be easily accessed. Part No: AYSB2101 3. Remove the top cover assembly, net steel.(Figure 24) Figure 24 Description The internal condensate pump serves as a means for...
  • Page 26 Figure 26 11. Place the pump bracket onto the end of the pump by feeding the pump cord through the hole in the bracket and pushing the bracket onto the threads of the pump. Slide the supplied washer onto the threads of the pump. Screw the pump nut onto the threads of the pump and tighten Condensate Tube the nut so that the bracket is secure against the pump.
  • Page 27 15. Place one of the hose clamps over one end of the 16-inch 18. To gain access inside the control panel, remove the vinyl hose. Place the same end over the barbed discharge knobs and escutcheon. Remove the two screws holding tube of the pump assembly.
  • Page 28 Architecture Grille Aluminum - Single Pack Note: A baffle kit must not be used with a stamped aluminum grille Part No: AYAGALA01 on any PTAC installation. Stamped Aluminum Grille Stamped Aluminum Grille 1. Prepare the wall sleeve for installation of the grille by removing the cardboard stiffener and rear enclosure panel from the sleeve.

  • Page 29: Drain Installation

    4. Secure the grille to the sleeve by tightening the four screws Receiving to their corresponding holes in the grille. Upon receipt of the product, inspect the shipping carton for 5. Remove the wire handle after the installation is complete. signs of visible damage.
  • Page 30 Figure 36 – Outdoor Drain Kit Installation contact the front edge of sleeve. Secure the chassis to the wall sleeve on each side with screws provided. Re-install the cabinet front. See the following pages for installation instructions of indoor DRAIN FITTING BLANK-OFF PLATE B PLATE C...
  • Page 31 Indoor Drain Kit Installation Leveling Legs The internal drain is installed on the bottom of the wall sleeve Part No: AYLL101 when it is required to drain the condensate into a drain system inside of the building. Description The components of the wall sleeve drain kit are shown in Leveling legs are designed to provide extra front support and Detail A.
  • Page 32 Leveling Leg Assembly Installation on Wall Sleeve To install the leveling leg assembly, complete the following: 1. Drill four 1/8-inch diameter holes in the wall sleeve, two on each side, using the leveling legs as a template. Caulk 1. Drill two 1/8-inch holes in each side of the wall sleeve, as around screws to prevent water leaks.
  • Page 33 Hard Wire Kit WARNING Part No: AYAGALA01 Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or Description serious injury.
  • Page 34 208/230 Volt Units Figure 45 - Mounting Hard Wire Junction Box Kit 1. Remove and discard the white lead from the wire assembly. Wall Sleeve 2. Connect the black lead to the line 2 terminal on the control board. 3. Connect the red lead to the common (C) terminal on the Ground Wie capacitor.
  • Page 35 Fuse Holder Kit CAUTION Use Copper Conductors Only! Part No: AYFH1101 Unit terminals are not designed to accept other types of conductors. Failure to use copper conductors may result in equipment damage. Important Note: All wiring must comply with applicable local and national codes.
  • Page 36 2. To gain access inside the control panel, after removing the Figure 49 - Fuse Holder Diagram knobs and escutcheon, remove the screws holding panel in Control Panel Installation position. FUSEHOLDERS Tilt control panel forward, being careful not to pinch any wires.
  • Page 37 Remote Escutcheon Kit Part No: AYRE110 Description This kit provides an attractive replacement escutcheon (see Figure 52). The kit allows the removal of control knobs and graphics, which are not required when a wall thermostat is used to control the unit. Receiving Figure 53 Upon receipt of the product, inspect the shipping carton for...
  • Page 38 5. Replace the escutcheon with the one from this kit by Installation inserting the tabs at the top of the escutcheon into the The installation and servicing of the equipment referred to in retaining holes and laying the escutcheon flat on the this booklet should be performed by qualified, experienced control panel.
  • Page 39 Note: Figure 58 - Dimensions The proper subbase must be ordered to obtain the correct electrical receptacle. (Figure 60) 13 3/4" 8. After wiring is complete, mount covers A and F to the Wall Sleeve subbase with provided screws. (Figure 57) 2 3/4"...

  • Page 40: Ferformance Data

    5. PERFORMANCE DATA Air Conditioner Performance Data LP070CM* LP090CM* LP120CM* LP150CM* Voltage (V) Cooling Data Cooling Capacity (Btu/h) 7,400 7,600 8,800 9,000 11,500 11,800 14,100 14,300 Cooling Amps (A) Cooling Power (W) 1045 1075 1470 1490 EER (Btuh/Watt) 12.5 12.5 11.6 11.6 11.0...
  • Page 41 Cooling Wattage - Air Conditioners Model LP070CM* LP090CM* LP120CM* LP150CM* Temperature Outdoor Return Air Total Wattage Total Wattage Total Wattage Total Wattage Dry Bulb Wet Bulb Input Input Input Input Rating Wattage 1045 1090 1045 1090 1050 1180 1080 1190 1055 1180 1090...
  • Page 42 Cooling Wattage - Heat Pumps Model LP070HM* LP090HM* LP120HM* LP150HM* Temperature Outdoor Return Air Total Wattage Total Wattage Total Wattage Total Wattage Dry Bulb Wet Bulb Input Input Input Input Rating Wattage 1120 1145 1430 1460 1120 1230 1445 1570 1125 1235 1465...
  • Page 43 Cooling change of temperature - Air Conditioners Room Air Room Air LP070CM LP090CM LP120CM LP150CM Temperature Across Temperature Across Temperature Across Temperature Across Bulb Bulb Indoor Coil (∆ T) Indoor Coil (∆ T) Indoor Coil (∆ T) Indoor Coil (∆ T) Rating Btu/h 7000 7600...
  • Page 44 Heating Change of Temperature - Heat Pumps Model Room Air Room Air LP070HM* LP090HM* LP120HM* LP150HM* Temperature Across Temperature Across Temperature Across Temperature Across Bulb Bulb Indoor Coil (∆ T) Indoor Coil (∆ T) Indoor Coil (∆ T) Indoor Coil (∆ T) Rating Btu/h 6200 6400 8200...

  • Page 45: Outside Dimensions

    6. TROUBLESHOOTING GUIDE 6.1 OUTSIDE DIMENSIONS 1,066mm (42") 505mm (20") 6.2 PIPING SYSTEM Following is a brief description of the important components and their functions in the refrigeration system. Refer to Figure 61 to follow the refrigeration cycle and the flow of the refrigerant in the cooling cycle. ROOM AIR CONDITIONER CYCLE OF REFRIGERATION EVAPORATOR COILS...

  • Page 46: Troubleshooting Guide

    6.3 TROUBLESHOOTING GUIDE In general, possible trouble is classified in two causes. The one is 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 is running but cooling is ineffective Ineffective Cooling Check of cold air circulation...
  • Page 47 Fails to Start Check power source. Check circuit breaker and fuse. Check control switch Gas leakage of feeler bulb setting. of thermostat Check control switch. Only compressor fails to Only fan fails to start. start. Improper wiring. Drop of power voltage. Improper thermostat setting Defect of fan motor capacitor.
  • Page 48 COMPLAINT CAUSE REMEDY Fan motor will not run. No power Check voltage at outlet. Correct if none. Power supply cord Check voltage to rotary switch. If none, check power supply cord. Replace cord if circuit is open. Rotary switch Check switch continuity. Refer to wiring diagram for terminal identification.

  • Page 49: Room Air Conditioner Voltage Limits

    COMPLAINT CAUSE REMEDY Compressor will not run, Voltage Check voltage. See the limits on the preceding. but fan motor runs. page. If not within limits, call an electrician. Wiring Check the wire connections, if loose, repair or replace the terminal. If wires are off, refer to wiring diagram for identification, and replace.
  • Page 50 REMEDY COMPLAINT CAUSE Compressor cycles Voltage Check the voltage. See the limits on the preced- on overload. ing page. If not within limits, call an electrician. Overload Check overload, if externally mounted. Replace if open. (If the compressor temperature is high, remove the overload, cool, and retest.) Fan motor If not running, determine the cause.

  • Page 51: Schematic Diagram

    7. SCHEMATIC DIAGRAM LOCATION PART NO. Q'TY DESCRIPTION REMARKS PER SET LP090CED LP120CED LP150CED POWER CORD 6411A20048M 4681A20064E 4681A20064A 4681A20064A INDOOR MOTOR OUTDOOR 4681A20200A 4681A20200A 4681A20200A BOX TYPE 3H00660C 3H00660C 3H00660C CAPACITOR CAN TYPE 2H1451G 6120AR2194C 6120AR2194C THERMOSTAT 6323A20006B 6323A20006B 6323A20006B COMPRESSOR 5416A30010A...
  • Page 52 LOCATION PART NO. Q'TY DESCRIPTION REMARKS PER SET LP090HED LP120HED LP150HED POWER CORD 6411A20048M 4681A20064E 4681A20064A 4681A20064A INDOOR MOTOR OUTDOOR 4681A20200A 4681A20200A 4681A20200A BOX TYPE 3H00660C 3H00660C 3H00660C CAPACITOR CAN TYPE 2H1451G 6120AR2194C 6120AR2194C INDOOR THERMISTOR 6323A20006B 6323A20006B 6323A20006B OUTDOOR THERMISTOR 6323A20006C 6323A20006C 6323A20006C...

  • Page 53: Exploded View

    8. EXPLODED VIEW 552114 35211A 552113 552113 552112 352115 352115-1 352116 352116 352115 552116 152302 435512 349600 148000 146811 359011 554030 546810 135515 352390 349600-1 W48602 354210 359011-1 549990 552206 130410 753010 249950 135312 330870 330860 152302-1 268714 249941 238310 135511-1 567502 435301...

  • Page 54: Replacement Parts List

    9. REPLACEMENT PARTS LIST • COOLING ONLY MODELS PART NO. LOCATION DESCRIPTION REMARK LP090CED LP120CED LP150CED 249950 Case Assembly,Control 4995A20824B 4995A20825C 4995A20826D 249941 Panel,Control 3720A20710A 138310 Escutcheon 3831A20145A 268712 PCB Assembly,Display 6871A00085A 268714 PCB Assembly,Main 6871A00084C 261702 Transformer ,linear 6170A20012A 249941-1 Barrier,Indoor 4790A20072A 249941-2 case,control...
  • Page 55 • HEATPUMP MODELS PART NO. LOCATION DESCRIPTION REMARK LP090HED LP120HED LP150HED 249950 Case Assembly,Control 4995A20824F 4995A20824A 4995A20824E 249941 Panel,Control 3720A20710A 3720A20710A 238310 Escutcheon 3831A20145A 3831A20145A 268712 PCB Assembly,Display 6871A00085A 6871A00085A 268714 PCB Assembly,Main 6871A00084A 261702 Transformer ,linear 6170A20012A 249941-1 Barrier,Indoor 4790A20072A 249941-2 case,control 4994A20127A...
  • Page 56 May, 2006 P/No.: 3828A20308D Printed in Korea...

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