LG LP070HED Service Manual Download

Page: 47 / 56

—47—

Fails to Start

Check circuit breaker
and fuse.

Gas leakage of feeler bulb
of thermostat

Check control switch.

Only fan fails to start.

Improper wiring.

Defect of fan motor
capacitor.

Irregular motor resistance
( ).
Irregular motor insulation
( ).

Replacement of fan motor

Regular but fails to start

Replacement of compressor
(locking of rotor, metal)

Improper thermostat setting

Loose terminal connection.

Improper wiring

Irregular motor resistance ( )

Irregular motor insulation ( )

Replacement of compressor
(Motor damaged)

Drop of power voltage.

Check capacitor.

Replacement.

Only compressor fails to
start.

Defect of compressor
capacitor.

Check power source.

Check control switch
setting.

Summary of Contents for LP070HED

Page 1: ...LG Packaged Terminal Air Conditioner Heat Pump SERVICE MANUAL LG CAUTION http www lgservice com BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL FOR AUTHORIZED SERVICE ONLY ...

Page 2: ...TALL THE UNIT 18 3 2 SUGGESTED TOOL REQUIREMENTS 20 3 2 1 PREPARATION OF SLEEVE 21 3 2 2 PREPARATION OF THE FRONT GRILLE 21 3 2 3 UNIT INSTALLATION 22 3 3 ELECTRICAL REQUIREMENTS 23 3 3 1 ELECTRICAL DATA FOR 230V 208 MODEL 23 3 3 2 ELECTRICAL SAFETY 23 4 FIELD INSTALLED ACCESSORIES 24 5 FERFORMANCE DATA 40 6 TROUBLESHOOTING GUIDE 6 1 OUTSIDE DIMENSIONS 45 6 2 PIPING SYSTEM 45 6 3 TROUBLESHOOTING G...

Page 3: ...9 4 WB 26 7 DB 19 4 WB 26 7 DB 19 4 WB 35 DB 23 9 WB 35 DB 23 9 WB 35 DB 23 9 WB 35 DB 23 9 WB 21 1 DB 15 6 WB 21 1 DB 15 6 WB 21 1 DB 15 6 WB 21 1 DB 15 6 WB 8 3 DB 6 1 WB 8 3 DB 6 1 WB 8 3 DB 6 1 WB 8 3 DB 6 1 WB 790 27 9 OZ 630 22 2 OZ 735 25 9 OZ 610 21 5 OZ 2 ROE 10 STACKS 2 ROE 10 STACKS 2 ROE 10 STACKS 2 ROE 12 STACKS 2 ROE 14 STACKS 2 ROE 17 STACKS 2 ROE 17 STACKS 2 ROE 17 STACKS Cross Flo...

Page 4: ...9 4 WB 35 DB 23 9 WB 35 DB 23 9 WB 35 DB 23 9 WB 21 1 DB 15 6 WB 21 1 DB 15 6 WB 21 1 DB 15 6 WB 8 3 DB 6 1 WB 8 3 DB 6 1 WB 8 3 DB 6 1 WB 860 30 3 OZ 815 28 7 OZ 1 050 37 0 OZ 2 ROE 10 STACKS 2 ROE 10 STACKS 2 ROE 10 STACKS 2 ROE 14 STACKS 3 ROE 17 STACKS 2 ROE 14 STACKS Cross Flow Fan Cross Flow Fan Cross Flow Fan Axial Fan Axial Fan Axial Fan 2 2 2 2 2 2 2 2 2 4 POLES 4 POLES 4 POLES MANUAL TYP...

Page 5: ...for optimizing cycling Fan Only Setting High Low The fan can run at HIGH or LOW speed without COOLING or HEATING to provide air circulation and ventilation Indoor Fan Speed Selections High Low The fan can run at HIGH or LOW speed for either COOLING or HEATING Two Fan motors The unit has two fan motors to provide quiet operation and maximum efficiency LED Diagnostics All units have this feature ind...

Page 6: ...both heating and cooling temperature limits by dip switches on control panel from 50 F to 90 F Temperature limits help to prevent overheating and overcooling and reduce energy costs Condensate Drain Valve The unit has a condensate drain valve to prevent water from collecting or freezing in the basepan Quick Heater Recovery The unit is designed to operate the electric heater to warm the room to the...

Page 7: ...eed fan operation HIGH HEAT Heating with the high speed fan operation VENTILATION The ventilation lever is located to the lower left side of the unit The ventilation lever must be in the CLOSE position in order to maintain the best cooling conditions When fresh air is necessary in the room set the ventilation lever to the OPEN position The damper is opened and outdoor air is drawn into the room Th...

Page 8: ...FF TIME You will usually use shut off time while you sleep If unit is running use Timer to set number of hours until shut off For your sleeping comfort once Time is set the Temperature setting will raise 2 F after 30 minutes and once again after another 30 minutes Push Timer to cycle through the settings from 1 Hour 2 Hours 12 Hours maximum TEMPERATURE SETTING Use this button to automatically cont...

Page 9: ... LOCAL 1 OFF 2 OFF 3 OFF 4 OFF 5 LOCAL 1 OFF 2 OFF 3 OFF 4 OFF 5 ON ON REMOTE OFF ON ON ON Remote Local Energy Saver Temperature Limit 1 Temperature Limit 2 Temperature Limit 3 LOCAL LOCAL 1 OFF OFF 2 OFF OFF 3 OFF OFF 4 OFF OFF 5 LOCAL 1 OFF 2 OFF 3 OFF 4 OFF 5 LOCAL LOCAL 1 OFF OFF 2 OFF OFF 3 OFF OFF 4 OFF OFF 5 LOCAL 1 OFF 2 OFF 3 OFF 4 OFF 5 OFF OFF OFF 54 F 12 2 C 86 F 30 0 C 86 F 30 0 C 86 ...

Page 10: ...e condition of setting without working compressor and heater When the front desk switch is OFF the unit can operate according to the setting of controls Molex Housing Spec 396 06V REMOTE WALL THERMOSTAT When the wires are connected the unit will be controlled by a remote wall thermostat The thermostat connections supply the 24 Volt AC When you install the digital electronic thermostat you must set...

Page 11: ...rom 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 off vertical In the alternate position the louvers will be at an angle of 15 off vertical To adjust air direction remove the front grille Remove the 4 screws that fasten the discharge grille to the front grille Flip the discharge gr...

Page 12: ... control box See Figure 2 3 Pull the control box from the Air guide 4 Remove the control box cover See Figure 3 5 Disconnect wire housings on the control box 6 Pull the control box assembly out from the unit See Figure 4 7 Re install the components by referring to the removal procedure Figure 2 Figure 3 Figure 4 ...

Page 13: ...the Evaporator See Figure 5 4 Remove the top cover assembly net steel brace See Figure 6 5 Remove the 6 screws which fasten the Air guide 6 Pull the Air guide assembly out from the unit See Figure 7 7 Remove the 2 screws which fasten the electric heater in the left hand side 8 Pull the electric heater towards left for a while and then lift up vertically to disassemble it completely from Air guide ...

Page 14: ...th wire See Figure 10 6 Remove the supports on both sides 7 Pull the cross flow fan out from the air guide 8 Re install the components by referring to the removal procedure 2 2 3 AXIAL FAN 1 Remove the brace 2 Remove the 4 screws which fasten the condenser with the shroud and the basepan See Figure 11 3 Remove the condenser sideways carefully 4 Remove the clamp which secures the fan with pliers Se...

Page 15: ...y 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 Disconnect the 3 leads from the compressor 3 After purging the unit completely unbraze the suction and discharge tubes at the compressor connections 4 Remove the 3 nuts and the 3 washers which fasten the compressor See Figu...

Page 16: ...laced by an exact replacement part The special cord means the cord which has the same specification marked on the supply cord fitted to the unit 2 3 6 P C B 1 Remove the escutcheon 2 Remove the two knobs 3 Remove the 2 screws which fasten P C B cover 4 Disconnect all the leads which connected to the P C B 5 Remove the two screws which fasten the P C B board 6 Re install the components by referring...

Page 17: ...assembly Refer to section 2 1 2 4 Remove the 4 screws which fasten the evaporator at the left side and the right side 5 Move the evaporator sideward carefully and then unbraze the interconnecting tube at the evaporator connectors 6 Remove the evaporator 7 Re install the components by referring to notes See Figure 20 2 4 3 CAPILLARY TUBE 1 After discharging the refrigerant completely unbraze the in...

Page 18: ...t the manifold connection 5 The system is now ready for final charging 6 Recharge as follows 1 Refrigeration cycle systems are charged from the high side If the total charge cannot be put in the high side the balance will be put in the suction line through the access valve which you installed as the system was opened 2 Connect the charging cylinder as shown in Figure 16B With valve C open discharg...

Page 19: ...r proof seal leak detector tubing cutter hand tools to remove components service valve A COMPOUND GAUGE EVAPORATOR LOW PRESSURE SIDE COMPRESSOR CAPILLARY TUBE CONDENSER HIGH PRESSURE SIDE SEE INSETS BELOW MANIFOLD GAUGE B Figure 16 A Pulling Vacuum Figure 16 B Charging A B EXTERNAL VACUUM PUMP A CHARGING CYLINDER LOW HI B C ...

Page 20: ... side of condenser space The insulation strip is provided with the box Refer to the diagram below 1 Take out the insulation strip from the upper packing 2 Attach the insulation strip onto the rear upper side of the wall sleeve 3 To improve unit energy efficiency it is recommended the change of outside grille for an unit protection and an addition of a plastic rear grille This is optional 4 Insulat...

Page 21: ...sleeve as shown on the right Assemble the outdoor grille and fasten the 4 screws as shown on the right 3 2 2 PREPARATION OF THE FRONT GRILLE Carefully remove shipping tape from the front grille SCREWDRIVER FLAT and PHILLIPS RULER KNIFE HAMMER PENCIL LEVEL I N D O O R I N D O O R INDOOR I N D O O R I N D O O R 1 4 1 2 1 1 Shipping Tape I N D O O R 3 2 SUGGESTED TOOL REQUIREMENTS SLEEVE HARDWARE NUM...

Page 22: ...t the bottom to release it then lift it up along the unit top front See Figure 18 3 Slide the unit into the wall sleeve and secure with 6 screws through the unit flange holes See Figure 19 4 Reinstall the front grille by hooking the top over the unit top then pushing it in at the bottom See Figure 20 Figure 17 Figure 18 Figure 19 Figure 20 ...

Page 23: ...MODEL 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 208 230 and 208 230 VOLT UNITS...

Page 24: ... lock by bowing the door with both hands and aligning the door hinge pins with their bracket in the front Figure 23 Important Note Personal Risk Hazard Underwriter s Laboratories Inc listed For institutional use only where supervisory monitoring is available Any other use may increase the risk of personal injury or property damage Note The installation and servicing of this equipment must be perfo...

Page 25: ... booklet should be performed by qualified experienced technicians WARNING 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 serious injury Important Note The unit OFF switch does not disconne...

Page 26: ...cket 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 the nut so that the bracket is secure against the pump Figure 29 12 Position the pump in the back left corner of the basepan and screw the pump b...

Page 27: ... slack and replace the permagum to prevent air leaks Figures 31 and 32 18 To gain access inside the control panel remove the knobs and escutcheon Remove the two screws holding the panel in position Tilt the control panel forward being careful not to pinch any wires Figure 33 19 Lift the control panel up so the control panel is free of its hinges Position the control panel so there is easy access f...

Page 28: ...he building Note The sleeve stiffener must be taken out before the rear sleeve enclosure panel can be removed from the sleeve 2 Prepare the stamped aluminum grille for installation on the sleeve by inserting the six 6 plastic grommets into the square holes located near the outer edges of all four sides of the grille With the grille positioned so the flanges of all four sides are in the up position...

Page 29: ...ury Important Note The unit OFF switch does not disconnect all electrical power to this unit Receiving Upon receipt of the product inspect the shipping carton for signs of visible damage Report any damage or shortage to the carrier and note it on the delivery receipt The product must be stored in its original shipping carton in a dry secure place prior to its installation and use Installation The ...

Page 30: ...ly to the left rear of wall sleeve with sheet metal screws provided See Figure 39 for finished left hand side installation If the unit chassis is to be installed right away install the condenser grille to wall sleeve with hardware provided See condenser grille installation instructions If the unit chassis will not be installed right away replace the rear enclosure panel in the wall sleeve This wil...

Page 31: ...e two blank off plates C and gaskets A on the outdoor portion of the wall sleeve as shown in Figure 40 These components may be installed after the sleeve is secured in the wall opening just prior to the installation of the condenser grille and chassis Leveling Legs Part No AYLL101 Description Leveling legs are designed to provide extra front support and leveling of the wall sleeve Two leg assembli...

Page 32: ... the sight glass toward the outside Check the level again after the unit has been installed Adjust the legs as needed Installation on Wall Sleeve 1 Drill four 1 8 inch diameter holes in the wall sleeve two on each side using the leveling legs as a template Caulk around screws to prevent water leaks 2 Attach the legs to the wall sleeve using the screws provided 3 Adjust the leveling legs to level t...

Page 33: ...ilure to disconnect power before servicing could result in death or serious injury Important Note The unit OFF switch does not disconnect all electrical power to this unit CAUTION Use Copper Conductors Only 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 a...

Page 34: ...ead to the center terminal of the fuse holder 3 Connect the white lead to the common C terminal on the capacitor 4 Connect the ground wire to the partition panel where the ground wire on the power cord was located Use the supplied green ground screw 5 Connect the white lead of the wire assembly at the junction box to the white lead of the field power source 6 Connect the black lead of the wire ass...

Page 35: ...N Use Copper Conductors Only 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 Type and location of fused disconnect switch es must comply with all applicable codes Failure to follow these codes could result in overheating and equipment fa...

Page 36: ...for installation in the control panel 1 Remove both knockouts at the fuse holder location Figure 50 2 Install the fuse holders using screws provided The side connector tab on the fuse holders should be towards the left 3 Connect a stripped BK 9 wire to the center of the quick connect tab of the fuse holders Wire nut the other end of this wire to the black field connection wire TB1 Figure 51 4 Conn...

Page 37: ...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 serious injury Important Note The unit OFF switch does not disconnect all electrical power to this unit 1 Grasp the cabinet front as shown in...

Page 38: ...ertently energized Failure to disconnect power before servicing could result in death or serious injury Important Note The unit OFF switch does not disconnect all electrical power to this unit CAUTION Use Copper Conductors Only Unit terminals are not designed to accept other types of conductors Failure to use copper conductors may result in equipment damage Note When using a subbase the wall sleev...

Page 39: ... 16 71 mm 11 13 16 300 mm A B F C E D D E Wall Sleeve Outdoor Side Wall Sleeve Inside Edge Back of Flange A 13 3 4 2 3 4 2 5 8 13 7 8 352 mm 3 1 16 78 mm Left End View Concentric Knockouts In Bottom Ground Screw Location Receptacle Provided Inside subbase Accessory Top View Concentric Knockouts In Rear Field Wiring Line Voltage Field Wiring Line Voltage NEMA 6 20R Receptacle 230 208 VAC Field Sche...

Page 40: ...ty Btu h Cooling Amps A Cooling Power W EER Btuh Watt Moisture Removal Pts h Heat Pump Heating Data Heating Capacity Btu h Heating Amps A Heating Power W COP W W Airflow Indoor CFM Wet 0 3ESP Hi Indoor CFM Wet 0 3ESP Lo Indoor CFM Dry 0 3ESP Hi Indoor CFM Dry 0 3ESP Lo LP090HM 208 230 9 000 9 300 4 1 3 8 820 845 11 0 11 0 2 6 2 6 8 000 8 200 3 4 3 1 690 705 3 4 3 4 240 270 190 230 260 290 220 250 ...

Page 41: ...70 855 1000 1125 1040 1160 60 555 680 765 850 990 1120 1030 1150 55 540 670 765 835 980 1105 1020 1135 85 540 660 730 815 950 1070 965 1085 80 540 665 735 820 950 1075 980 1095 75 540 665 735 820 955 1080 990 1105 90 70 540 665 735 820 950 1075 990 1105 65 535 660 730 815 950 1070 990 1100 60 525 660 720 805 940 1060 980 1095 55 520 640 710 795 930 1055 965 1075 85 510 635 690 770 895 1020 915 102...

Page 42: ...00 1520 60 575 675 780 880 1060 1170 1390 1515 55 560 655 770 865 1050 1160 1370 1495 85 550 640 745 845 1020 1130 1305 1430 80 555 645 750 850 1025 1135 1325 1445 75 555 645 750 850 1025 1135 1335 1460 90 70 555 645 750 850 1025 1125 1340 1460 65 550 640 745 845 1020 1130 1335 1455 60 540 630 735 835 1010 1120 1320 1440 55 530 620 720 825 1000 1110 1260 1420 85 515 610 700 800 970 1080 1240 1360 ...

Page 43: ...4 28 31 26 30 26 28 65 12 15 12 14 9 13 9 13 70 60 17 20 16 18 13 17 13 17 55 22 24 20 22 18 21 17 21 Model Room Air Room Air LP070HM LP090HM LP120HM LP150HM Dry Wet Temperature Across Temperature Across Temperature Across Temperature Across Bulb Bulb Indoor Coil T Indoor Coil T Indoor Coil T Indoor Coil T Min Max Min Max Min Max Min Max Rating Btu h 7300 7600 9300 9600 12300 12600 14300 14600 Rat...

Page 44: ...28 30 80 23 24 25 28 28 31 29 31 50 75 24 25 26 29 29 32 30 31 70 26 27 28 30 31 34 32 33 65 26 27 28 30 31 34 32 33 85 19 22 22 24 24 29 27 30 80 20 23 23 25 25 29 28 31 45 75 21 24 24 26 26 30 29 31 70 22 24 24 27 27 31 30 32 65 23 25 25 28 28 32 31 33 85 17 20 20 22 23 27 27 30 80 18 21 21 23 23 28 28 31 40 75 19 22 22 24 24 29 29 31 70 20 23 23 24 25 29 30 32 65 21 24 24 25 26 30 31 33 85 15 1...

Page 45: ...le and the flow of the refrigerant in the cooling cycle MOTOR COMPRESSOR OIL LIQUID REFRIGERANT CAPILLARY TUBE OUTSIDE COOLING AIR FOR REFRIGERANT PASS THROUGH SUCTION LIME COOL LOW PRESSURE VAPOR COOLED AIR COMPLETE LIQUID BOIL OFF POINT LIQUID PRESSURE DROP ROOM AIR HEAT LOAD VAPOR INLET HOT DISCHARGED AIR LIQUID OUTLET HIGH PRESSURE VAPOR LIQUID PEFRIGERANT LOW PRESSURE VAPOR ROOM AIR CONDITION...

Page 46: ...Check gas leakage Repair gas leak Replacement of unit if the unit is beyond repair Satisfactory operation with temperature difference of inlet outlet air 44 6 50 F 7 10 C Check heat load increase Unexpected residue Overloaded Circuit Check of inside gas pressure Adjusting of refrigerant charge Malfunction of compressor Replacement of compressor Check of cold air circulation for smooth flow Dirty i...

Page 47: ...lation Replacement of fan motor Regular but fails to start Replacement of compressor locking of rotor metal Improper thermostat setting Loose terminal connection Improper wiring Irregular motor resistance Irregular motor insulation Replacement of compressor Motor damaged Drop of power voltage Check capacitor Replacement Only compressor fails to start Defect of compressor capacitor Check power sour...

Page 48: ... bearings if motor shaft will not rotate replace the motor Check voltage See limits on this page If not within limits call an electrician Test capacitor Check bearings Does the fan blade rotate freely If not replace fan motor Pay attention to any change from high speed to low speed If the speed does not change replace the motor Check grommets if worn or missing replace them If cracked out of balan...

Page 49: ...e position of knob If not at the coldest setting advance the knob to this setting and restart unit Check continuity of the thermostat Replace thermostat if circuit is open Check the capacitor Replace if not within 10 of manufacturers rating Replace if shorted open or damaged Check the compressor for open circuit or ground If open or grounded replace the compressor Check the compressor overload if ...

Page 50: ...ures will increase causing the compressor to cycle Straighten the fins or replace the coil Test capacitor Check the terminals If loose repair or replace Check the system for restriction If restricted clean of replace Close if open Determine if the unit is properly sized for the area to be cooled Check the set screw or clamp If loose or missing correct If the blower or fan is hitting air guide rear...

Page 51: ...A90013B 4681A20064A 4681A20200A 3H00660C 6120AR2194C 6323A20006B 2520UTBK055 6750U L028A 4681A20064A 4681A20200A 3H00660C 6120AR2194C 6323A20006B 2520UMCK2CA 6750U L005A LP120CED 6411A20048M LP150CED 1 1 1 1 1 1 1 REMARKS DESCRIPTION PART NO POWER CORD MOTOR CAPACITOR THERMOSTAT COMPRESSOR OVERLOAD PROTECTOR INDOOR OUTDOOR BOX TYPE CAN TYPE ...

Page 52: ...0A 3H00660C 6120AR2194C 6323A20006B 6323A20006C 5416A90055B 6750A90013C 4681A20064A 4681A20200A 3H00660C 6120AR2194C 6323A20006B 6323A20006C 2520UMCK2CA 6750U L005A LP120HED 6411A20048M LP150HED 1 1 1 1 1 1 1 1 REMARKS DESCRIPTION PART NO POWER CORD MOTOR CAPACITOR INDOOR THERMISTOR OUTDOOR THERMISTOR COMPRESSOR OVERLOAD PROTECTOR INDOOR OUTDOOR BOX TYPE CAN TYPE ...

Page 53: ...5301 249941 W1CZZ 1 W0CZZ W6640 238310 268714 354210 349600 1 546810 359011 1 W48602 549990 130410 249950 554160 554030 135515 349600 330860 567502 135511 1 249941 1 550140 148000 264110 TE MP TI ME MO DE HEA T HEA T E SA VE E SA VE FAN FAN COO L COO L HIG H HIG H LOW LOW TIM ER TIM ER FAN TIM ER F ON OFF ON OFF ON OFF ON OFF 268712 249941 3 249941 2 668713 352115 1 552206 ...

Page 54: ...9905A 5211A29905A 5211A29905A R 352115 Tube Assembly Evaporator IN 5210A26178B 5210A26178B 5210A26178B R 552113 Tube Assembly Condenser Out 5211A24129A 5211A24129B 5211A24129C R D 352390 Guide Assembly Air 5239A10019B 5239A10019A 5239A10019A R 146811 Motor AC 4681A20064E 4681A20064A 4681A20064A R 349600 Braket Motor 4960A20026A 4810A20809A 4810A20809A R 359011 Fan Assembly Cross Flow 5901A20050A R...

Page 55: ...18B R 552112 Tube Assembly Condenser In 5211A20678A 5211A21793A 5211A20678A R 552113 Tube Assembly Condenser Out AJR30228801 5211A21794A AJR30228802 R D 352390 Guide Assembly Air 5239A10019D 5239A10019C 5239A10019C R 146811 Motor AC 4681A20064E 4681A20064A 4681A20064A R 349600 Braket Motor 4960A20026A 4810A20809A 4810A20809A R 359011 Fan Assembly Cross Flow 5901A20050A R 359001 Damper Assembly 490...

Page 56: ...P No 3828A20308D May 2006 Printed in Korea ...

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