LG LP070CED Service Manual
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LG LP070CED Service Manual

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 LP070CED

  • Page 1: Service 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.

  • Page 2: Table Of Contents

    SERVICE MANUAL This parts, etc. This room air conditioner was manufactured and assembled under a 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 SPECIFICATIONS...
  • Page 3 ❈ Some of functions are slightly different depending upon models. ❈ The specification may be subject to change without notice for purpose of improvement. ❈ The specification may be subject to change without notice for purpose of improvement. LP070CED LP090CED 2.17 2.23...
  • Page 4 Models Cooling Capacity Heating Capacity Power Input Cooling/Heating Running Current Cooling/Heating Starting Current Cooling/Heating Power Supply Power Factor Indoor,Max Air Flow Rate Outdoor,Max Moisture Removal Sound Level Indoor,H/M/L Outdoor,Max Refrigerant & Charge Type Model Motor Type Compressor Oil Type Oil Charge O.L.P Name Type(In/Out) Motor Type...
  • Page 5 1.1.2 HEATING ELECTRICAL Models Cooling Capacity Heating Capacity Power Input Cooling/Heating Running Current Cooling/Heating Starting Current Cooling/Heating Power Supply Power Factor Indoor,Max Air Flow Rate Outdoor,Max Moisture Removal Sound Level Indoor,H/M/L Outdoor,Max Refrigerant & Charge Type Model Motor Type Compressor Oil Type Oil Charge O.L.P Name...
  • Page 6 1.1.3 MECHANICAL Models Cooling Capacity Heating Capacity Power Input Cooling/Heating Running Current Cooling/Heating Starting Current Cooling/Heating Power Supply Power Factor Indoor,Max Air Flow Rate Outdoor,Max Moisture Removal Sound Level Indoor,H/M/L Outdoor,Max Refrigerant & Charge Type Model Motor Type Compressor Oil Type Oil Charge O.L.P Name Type(In/Out)

  • Page 7: 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 8 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 9: Control Locations

    The damper is opened and outdoor air is drawn into the room. This will reduce the cooling or heating efficiency. CAUTION When the air conditioner has performed a cooling or heating operation and is turned off or set to the fan position, wait at least 3 minutes before resetting to the cooling operation.

  • Page 10: Electronic Controls

    HIGH POWER COOL COOL TIMER TIMER • To turn the air conditioner ON, push this button. MODE TIMER • This button takes priority over any other button. TEMPERATURE SETTING • Use this button to automatically control the • The setting appears in the display.

  • Page 11: 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 12: Temperature Limiting

    • 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 13: Energy Saver

    • REMOTE/LOCAL CONTROL When remote/local switch #1 is on, it allow the unit to operate by the 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 14 • 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 continuous fan to provide continuous fan operation in cool or heat modes.

  • Page 15: Disassembly Instructions

    • This Room Air Conditioner (PTAC) discharges air from the top of the unit through reversible, 2-position discharge grille louvers. The unit is shipped from the factory with the discharge grille louvers at an angle of 40˚...

  • Page 16: 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. 4. Remove the control box cover. (See Figure 3) 5.

  • Page 17: 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. (See Figure 5) 4.

  • Page 18: 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) 5.

  • Page 19: 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 20: 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 21: 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 22 NOTES — Replacement of the refrigeration cycle. 1. When replacing the refrigeration cycle, be sure to 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.
  • Page 23 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 —23—...

  • Page 24: Installation

    Install the new air conditioner according to these installation instructions to achieve the best performence. All wall sleeves used to mount the new air conditioner must be in good structural condition and have a rear grille that securely attaches to the sleeve or the flange of the sleeve to secure the new air conditioner.

  • Page 25: Wallsleeve Installation

    3.2 WALL SLEEVE INSTALLATION 3.2.1 Wall Case Installation Data General Generally, units are installed 3" to 5" above the floor (flush to finished floor installation is possible) as near to the center of the room as possible; underneath a window or a glass panel is typical. Normal installation of the wall case allows installation flexibility;...

  • Page 26: Preparation Of Front Grille

    Preparation of the Wall Case for All Types of Construction As shipped, the LG wall sleeve is ready for installation. Do not remove the stiffener from inside the wall case or the weather closure panel from the outside face of the wall case until the outdoor grille and chassis are ready to be installed.
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  • Page 29: Unit Installation

    3.2.3 UNIT INSTALLATION 1. Remove the shipping screw from the ventilation door. (See 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) 3.

  • Page 30: Electrical Requirements

    3.3.2 ELECTRICAL SAFETY IMPORTANT GROUNDING INSTRUCTIONS The air conditioner has a three-prong grounding plug on its power supply cord which must be plugged into properly grounded three-prong wall receptacle for your protection against possible shock hazard. FUSE – Use a time-delay fuse or circuit breaker. Refer to the nameplate for proper power supply requirements.

  • Page 31: 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 32 Condensate Disposal Pump Kit Installation Part No: AYSB2101 Description The internal condensate pump serves as a means for disposing of condensate generated during heat pump operation by transferring it to the indoor coil. The warm coil surface and the warm room air help in evaporation of the condensate while adding humidity to the room.
  • Page 33 Figure 26 7. Position the condensate tube through existing hole (located right side of blower deck). 8. Make sure the holes in the condensate tube are facing inward toward the blower wheel. 9. Lower the discharge deck over the condensate tube and screw the discharge deck to the chassis with the existing screws.
  • Page 34 15. Place one of the hose clamps over one end of the 16-inch vinyl hose. Place the same end over the barbed discharge tube of the pump assembly. Place a hose clamp on the other end of the 16 inch hose. Place this same end over the shorter leg of the overflow tube and secure the hose with the hose clamp.
  • Page 35 Architecture Grille Aluminum - Single Pack Part No: AYAGALA01 Stamped Aluminum Grille Architecture Grille Description Outdoor grilles are attached to the wall sleeve and exposed to the exterior wall. The grilles are an industry standard size of 42" x 16". Receiving Upon receipt of the product, inspect the shipping carton for signs of visible damage.

  • Page 36: Drain Installation

    4. Secure the grille to the sleeve by tightening the four screws to their corresponding holes in the grille. 5. Remove the wire handle after the installation is complete. Note: The stamped aluminum grille includes 6 screws, washers, nuts, and plastic grommets. The architectural grille includes 4 screws.
  • Page 37 Figure 36 – Outdoor Drain Kit Installation DRAIN FITTING PLATE B 1/2" DRAIN FITTING GASKETS A MTG. SCREWS Outdoor Drain Kit Installation Before installing the wall sleeve louvered condenser grille, it must be determined if the optional outdoor wall sleeve drain kit is to be installed.
  • Page 38 Indoor Drain Kit Installation The internal drain is installed on the bottom of the wall sleeve when it is required to drain the condensate into a drain system inside of the building. The components of the wall sleeve drain kit are shown in Detail A.
  • Page 39 Leveling Leg Assembly To install the leveling leg assembly, complete the following: 1. Drill two 1/8-inch holes in each side of the wall sleeve, as shown in Figure 43, using the leveling leg assembly as a template. Locations near the front of the sleeve provide more support.
  • Page 40 Hard Wire Kit Part No: AYAGALA01 Description Hard Wire Junction Box (Direct Wire Sub-Base) The hard wire junction box kit is used to hard wire the unit when it is not desirable to use the standard unit subbase or the unit power cord.
  • Page 41 208/230 Volt Units 1. Remove and discard the white lead from the wire assembly. 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 capacitor.
  • Page 42 Fuse Holder Kit Part No: AYFH1101 Description This optional fuse holder kit can be installed directly in the chassis or in the optional subbase. Fuse holder kits are available in 230/ 208 volt ratings. The installer should supply time delay fuses at 15, 20, 25, or 30 amps in accordance with the Maximum Overcurrent Protection as listed on the unit nameplate.
  • Page 43 2. To gain access inside the control panel, after removing the knobs and escutcheon, remove the screws holding panel in position. Tilt control panel forward, being careful not to pinch any wires. (Figure 48) 3. As viewed from the front, remove both knockouts on the control panel.
  • Page 44 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 Upon receipt of the product, inspect the shipping carton for signs of visible damage.
  • Page 45 5. Replace the escutcheon with the one from this kit by inserting the tabs at the top of the escutcheon into the retaining holes and laying the escutcheon flat on the control panel. 6. Replace the front by reversing steps 1 through 4. 7.
  • Page 46 Note: The proper subbase must be ordered to obtain the correct electrical receptacle. (Figure 60) 8. After wiring is complete, mount covers A and F to the subbase with provided screws. (Figure 57) 9. When installing optional accessories to the subbase, refer to each installation instruction for that accessory.

  • Page 47: Ferformance Data

    5. PERFORMANCE DATA Air Conditioner Performance Data LP070CE* Voltage (V) Cooling Data Cooling Capacity (Btu/h) 7,400 7,600 Cooling Amps (A) Cooling Power (W) EER (Btuh/Watt) 12.5 Moisture Removal (Pts/h) Airflow Indoor CFM (W et) @0.3ESP (Hi) Indoor CFM (W et) @0.3ESP (Lo)
  • Page 48 Cooling Wattage - Air Conditioners Model LP070CE* Temperature Outdoor Return Air Total W attage Dry Bulb Wet Bulb Input Rating W attage LP090CE* Total W attage Input —48— LP120CE* LP150CE* Total W attage Total W attage Input Input 1045 1090 1045 1050 1180...
  • Page 49 Cooling Wattage - Heat Pumps Model LP070HE* Temperature Outdoor Return Air Total W attage Dry Bulb Wet Bulb Input Rating W attage LP090HE* Total W attage Input —49— LP120HE* LP150HE* Total W attage Total W attage Input Input 1120 1145 1430 1120 1230...
  • Page 50 Cooling change of temperature - Air Conditioners Room Air Room Air LP070CE* Temperature Across Bulb Bulb Indoor Coil ( T) Rating Btu/h 7000 Rating CFM Cooling Change of Temperature - Heat Pumps Room Air Room Air LP070HE* Temperature Across Bulb Bulb Indoor Coil ( Rating Btu/h...
  • Page 51 Heating Change of Temperature - Heat Pumps Room Air Room Air LP070HE* Temperature Across Bulb Bulb Indoor Coil ( T) Rating Btu/h 6200 Rating CFM Cooling Ampere Chart - Air Conditioners Cond Inlet Air Model Temperature LP070CE* Amperage Rating Ampere Cooling Ampere Chart - Heat Pumps Cond Inlet Air Model...

  • Page 52: Outside Dimensions

    Refer to Figure 61 to follow the refrigeration cycle and the flow of the refrigerant in the cooling cycle. EVAPORATOR COILS COOLED LIQUID PRESSURE DROP 1,066mm (42") 505mm (20") ROOM AIR CONDITIONER CYCLE OF REFRIGERATION SUCTION LIME COMPLETE LIQUID COOL LOW PRESSURE VAPOR BOIL OFF POINT ROOM AIR HEAT LOAD OUTSIDE COOLING...

  • Page 53: 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 Check of cold air circulation for smooth flow.
  • Page 54 Check power source. Check control switch setting. Only compressor fails to start. Drop of power voltage. Defect of compressor capacitor. Check capacitor. Replacement. Irregular motor resistance ( ) Irregular motor insulation ( ) Replacement of compressor (Motor damaged) Fails to Start Improper thermostat setting Loose terminal connection.
  • Page 55 COMPLAINT Fan motor will not run. No power Power supply cord Rotary switch Wire disconnected or connection loose Capacitor (Discharge capacitor before testing.) Will not rotate Fan motor runs Revolves on overload. intermittently Fan motor noise. Grommets Turbo fan Loose set screw Worn bearings CAUSE Check voltage at outlet.

  • Page 56: Room Air Conditioner Voltage Limits

    Thermostat Capacitor (Discharge capacitor before servicing.) Compressor Overload ROOM AIR CONDITIONER VOLTAGE LIMITS NAME PLATE RATING 208/230V CAUSE Check voltage. See the limits on the preceding. page. If not within limits, call an electrician. Check the wire connections, if loose, repair or replace the terminal.
  • Page 57 COMPLAINT Compressor cycles Voltage on overload. Overload Fan motor Condenser air flow restriction Condenser fins (damaged) Capacitor Wiring Refrigerating system Insufficient cooling or Air filter heating Exhaust damper door Unit undersized Excessive noise. Cross flow fan Copper tubing CAUSE Check the voltage. See the limits on the preced- ing page.

  • Page 58: Schematic Diagram

    7. SCHEMATIC DIAGRAM 7.1 ELECTRICAL "A" OUTDOOR OR(BR) OR(BR) MOTOR HERM COMP "B" INDOOR MOTOR CAPACITOR GN/YL CN-IDAT CN-IDPT CN-AUX_S CN-THERMO_S CN-LINK NEUTRAL LIVE GN/YL INDOOR COIL THERMISTOR INDOOR AIR THERMISTOR CN-DISP1 CN-DISP2 CN-ODT CN-IDF CN-4WAY CN-ICR —58— In part "A", there are 3 types. Type.1 OUTDOOR OR(BR)
  • Page 59 7.2 HEATING ELECTRICAL "A" OUTDOOR OR(BR) OR(BR) MOTOR HERM COMP "B" INDOOR MOTOR CAPACITOR GN/YL CN-IDAT CN-IDPT CN-AUX_S CN-THERMO_S CN-LINK NEUTRAL LIVE GN/YL INDOOR COIL THERMISTOR INDOOR AIR THERMISTOR CN-DISP1 CN-DISP2 CN-ODT CN-IDF CN-4WAY CN-ICR —59— In part "A", there are 3 types. Type.1 OUTDOOR OR(BR)
  • Page 60 7.3 MECHANICAL P/NO:3850A20594J CN-TRANS CN-EXT CN-COMP CN-N CN-L CN-IDAT CN-IDPT CN-EXTN(N) CN-IDF CN-ODF RY-HEST1 RY-OFD —60—...

  • Page 61: Exploded View

    8. EXPLODED VIEW 8.1 COOLING ELECTRICAL 352390 149400 359011 337000 135515 W50400 753010 152302 135800 552114 35211A 552113 352116 352115 152302-1 349600-1 346810 546810 349600 354210 263230-1 135312 330870 237200 238310 249941-1 268711-1 264110 249941-2 268711-4 —61— 148000 435300 554030 567480-4 559011 549990...
  • Page 62 8.2 HEATING ELECTRICAL 552113 552112 352115 352116 552116 149400 359011 337000 135515 W50400 753010 152302 135800 352390 152302-1 346810 546810 349600 354210 263230-2 263230-1 135312 330870 237200 238310 249941-1 268711-1 264110 249941-2 268711-4 —62— 148000 349600-1 435300 554030 567480-4 559011 549990 552206 135500...
  • Page 63 8.3 MECHANICAL 552113 552112 352115 352116 552116 149400 359011 337000 135515 W50400 753010 152302 135800 352390 152302-1 546810 349600 354210 263230-1 135312 330870 238310 149410 237200 249941-1 264110 249941-2 —63— 148000 349600-1 346810 554030 559011 549990 135500 249951 268711-2 135511 W0CZZ-2 W6640 W0CZZ...
  • Page 64 January, 2007 P/No.: 3828A20308D Printed in Korea...

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