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LG LP070CEM Service Manual
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LG LP070CEM Service Manual

LG LP070CEM Service Manual

Lg packaged terminal air conditioner/heat pump
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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 LP070CEM

  • 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 ........16 2.4.3 CAPILLARY TUBE.......16 1.1 SPECIFICATIONS ..........3 1.2 FEATURES AND BENEFITS......4 3. INSTALLATION 1.3 CONTROL LOCATIONS .........6 3.1 HOW TO INSTALL THE UNIT ......17 1.4 ADDITIONAL CONTROLS......8 3.2 SUGGESTED TOOL REQUIREMENTS ..19 2. DISASSEMBLY INSTRUCTIONS 3.2.1 PREPARATION OF SLEEVE ....20 3.2.2 PREPARATION OF THE FRONT 2.1 MECHANICAL PARTS........10...

  • Page 3: Specifications

    6.5/7.3 5.8/6.3 LP 12 0 C M 2 12 34 5 6 7 8 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: 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 5 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 6: 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 7: 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 High Low} REMOTE CONTROL SIGNAL RECEIVER HEAT HEAT E/SAVE E/SAVE F1 LOW HIGH HIGH F2 HIGH...

  • Page 8: 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 9: 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 10: 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 11: 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 12: 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 13: 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 14: 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 15: 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 16: 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 17 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 18 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 —18—...

  • Page 19: 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 20: 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 21: 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 22: 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 23: 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 24 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 25 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 26 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 27 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 28: 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 29 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 30 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 31 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 32 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 33 208/230 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 34 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 35 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 36 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 37 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 38 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 39: Performance 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 40 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 41 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 42 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 43 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 44: 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 45 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 46 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 47 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 48: 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 49 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 50: 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 51 LOCATION PART NO. Q'TY DESCRIPTION REMARKS PER SET LP090HED LP120HED LP150HED 6411A20048M POWER CORD 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 52: Exploded View

    8. EXPLODED VIEW 552114 35211A 552113 552113 552112 352115 352116 352116 352115 552116 152302 349600 148000 146811 359011 554030 546810 753010 352390 546810-1 W48602 354210 359011 549990 W50400 130401 135511 753000 435301 152302-1 261702 249950 249941 238310 135511 567502 263230 554160 W0CZZ 268712...

  • Page 53: 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 54 • 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 55 April, 2006 P/No.: 3828A20308D Printed in Korea...

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