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LG Electronics LP121CEM-Y8 manual

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Table of contents for the manual

  • Page 1

    Window Air Conditioner SVC MANUAL MODEL : LP121CEM-Y8 CAUTION Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel. Internal Use Only http://biz.lgservice.com[...]

  • Page 2

    - 2 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1. Specification Cooling Capacity kW Btu/h. Heating Capacity ( for Heat Pump models) kW Btu/h. Electric Heater capacity kW Btu/h. Power Input Cooling/Heating W Running Current Cooling/Heating A Starting current Cooling/Heatin[...]

  • Page 3

    - 3 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1.2 FEA TURES AND BENEFITS The PTAC has many features, some of which are different than those found on conventional PTAC units. The servicer must be familiar with these features in order to properly service the unit. • IIR [...]

  • Page 4

    • Indoor Filters The unit uses two indoor filters which slide in and cut easily. The filters may be cleaned by washing and brushing without removing the front grille. • Rotary Compressor The unit uses a rotary compressor for quiet, reliable operation and long life. • 2 Position Discharge Grille The discharge grille can provide air flows upwar[...]

  • Page 5

    - 5 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1.3 CONTR OL LOCA TIONS • OPERA TION ELECTRIC HEA TING MODEL VENT OPEN VENT CLOSE TEMPERATURE CONTROL Set the Thermostat control to the desired temperature mark 5 (the mid-point is a good starting position). If the room tem[...]

  • Page 6

    - 6 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1.4 ADDITIONAL CONTR OLS • TEMPERA TURE LIMITING Temperature Limiting can save money by limiting the lowest temperature for cooling and the highest temperature for heating. The temperature limiting is controlled by dip swit[...]

  • Page 7

    - 7 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only (Molex Housing Spec 396-09V) • FRONT DESK CONTR OL When the pair wire is connected to the connector LOand LI, the unit can be turned ON or OFF with a switch located at the Front Desk Control panel. When the front desk switc[...]

  • Page 8

    - 8 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 2.1 MECHANICAL P AR TS 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. Re-install the component by referring to the remova[...]

  • Page 9

    - 9 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 2.1.2 CONTROL BO X 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 F[...]

  • Page 10

    - 10 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Figure 8 2.2 AIR HANDLING P AR TS 2.2.1 ELECTRIC HEA TER (ELECTRIC HEA TER MODEL ONL Y) 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 [...]

  • Page 11

    - 11 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Figure 12 2.2.2 CROSS FLO W F AN 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. L[...]

  • Page 12

    - 12 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 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[...]

  • Page 13

    - 13 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 2.3.5 PO WER 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 [...]

  • Page 14

    - 14 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 2.4 REFRIGERA TION CYCLE 2.4.1 CONDENSER 1. Remove the brace and the shroud. (Refer to section 2.2.2) 2. Remove the 4 screws which fasten the shroud. (Refer to section 2.2.2) 3. Push forward the shroud and remove the 2 screw[...]

  • Page 15

    - 15 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only — 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, inst[...]

  • Page 16

    - 16 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 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. A COMPOU[...]

  • Page 17

    - 17 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 3.1 HO W T O INST ALL THE UNIT For existing sleeve, you should measure the wall sleeve dimensions. Install the new air conditioner according to these installation instructions to achieve the best performence. All wall sleeve[...]

  • Page 18

    - 18 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 3.2 W ALL SLEEVE INST ALLA TION 3.2.1 W all 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 roo[...]

  • Page 19

    - 19 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 3.2.2 PREP ARA TION OF THE FRONT GRILLE Carefully remove shipping tape from the front grille. Brick, Frame, Stucco and Shingle Construction For new construction, the opening for the wall case should be framed and the wall ca[...]

  • Page 20

    - 20 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only[...]

  • Page 21

    - 21 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only W ALL SECTION – DET AILED SIDE VIEW FRAME AND BRICK VENEER INST ALLA TION Cord Set Connected CAULK* Sub-Base Connected CAULK* STEEL LINTEL RAB71 13-3/4" RAB77 13-7/8" 20-7/8" (RAB71) 21" (RAB77) ROOM CA[...]

  • Page 22

    - 22 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 3.2.3 UNIT INST ALLA TION 1. Remove the shipping screw from the ventilation door. (See Figure 24) 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[...]

  • Page 23

    - 23 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only P erpendicular 20 A T andem 15 A Large T andem 30 A 230/208 v olt receptacle configuration CAUTION 1. Do not use an extension cord with this unit. 2. When the unit is in the OFF position, the power supply to the electrical c[...]

  • Page 24

    - 24 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Contr ol P anel Ke y Lock Part No: AYCP101 Description The Key Lock kit prevents tampering of the controls used to set temperatures and heating or cooling functions. Receiving Upon receipt of the product, inspect the shippin[...]

  • Page 25

    - 25 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 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. T[...]

  • Page 26

    - 26 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 7. Remove the screw that attaches the electric heater wire to the side of the indoor fan housing. 8. Remove the 3 screws which fasten the top cover assembly. 9. Position water spraying plastic tube into the electric heater c[...]

  • Page 27

    14. Connect the condensate pump to the ICR rela y of the ter minal of the board as shown in fig. 40 Make sure to f asten the pump wire through the wire clip on the back side of the control barrier as shown in fig. 39 15. Assembly the unit bac k f ollowing the re verse order of disassemb ly . NO TE: All tube should be inser ted into rubber elbows b [...]

  • Page 28

    - 28 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Ar chitecture Grille Aluminum - Single Pa ck Part No: AYAGALA01 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". [...]

  • Page 29

    - 29 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 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, [...]

  • Page 30

    - 30 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 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. The drain kit will allow the condensate from[...]

  • Page 31

    - 31 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 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 k[...]

  • Page 32

    - 32 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 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 48, using the leveling leg assembly as a template. Locations[...]

  • Page 33

    - 33 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Har d 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 p[...]

  • Page 34

    - 34 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 208/230 V olt 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. 4. [...]

  • Page 35

    - 35 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Remote Escutcheon Kit Part No: AYRE110 Description This kit provides an attractive replacement escutcheon (see Figure 53). The kit allows the removal of control knobs and graphics, which are not required when a wall thermost[...]

  • Page 36

    - 36 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 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 [...]

  • Page 37

    - 37 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Note: The proper subbase must be ordered to obtain the correct electrical receptacle. (Figure 61) 8. After wiring is complete, mount covers A and F to the subbase with provided screws. (Figure 58) 9. When installing optional[...]

  • Page 38

    - 38 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5.1 OUTSIDE DIMENSIONS 1,066mm (42") 505mm (20") 406mm (16") 406mm (16") 5.2 PIPING SYSTEM Following is a brief description of the important components and their functions in the refrigeration system. Ref[...]

  • Page 39

    - 39 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 5.3 TR OUBLESHOO TING 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[...]

  • Page 40

    - 40 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Fails to Start Check circuit break er and fuse. Gas leakage of f eeler bulb of thermostat Check control s witch. Only f an fails to start. Improper wiring. Def ect of fan motor capacitor . Irregular motor resistance ( ). Irr[...]

  • Page 41

    - 41 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only COMPLAINT CAUSE REMEDY Check voltage at outlet. Correct if none. Check voltage to rotary switch. If none, check power supply cord. Replace cord if circuit is open. Check switch continuity. Refer to wiring diagram for termina[...]

  • Page 42

    - 42 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only NAME PLATE RATING MINIMUM MAXIMUM 208/230V 187V 253V COMPLAINT CAUSE REMEDY Check voltage. See the limits on the preceding. page. If not within limits, call an electrician. Check the wire connections, if loose, repair or rep[...]

  • Page 43

    - 43 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only COMPLAINT CAUSE REMEDY Check the voltage. See the limits on the preced- ing page. If not within limits, call an electrician. Check overload, if externally mounted. Replace if open. (If the compressor temperature is high, rem[...]

  • Page 44

    - 44 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 6. Piping Diagrams CAPILLARY TUBE HEAT EXCHANGER (EVAPORATOR) HEAT EXCHANGER (CONDENSER) COMPRESSOR Th1 Th2 LOC. Description PCB Connector Th1 Thermistor for indoor Air temperature CN-IDAT Th2 Thermistor for Evaporator pipe [...]

  • Page 45

    - 45 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only CN-TRANS CN-COMP CN-N(N) CN-IAT CN-ICT CN-EXT(L) CN-IDF CN-ICR CN-ODF RY-HEAT2 RY-HEAT1 CN-N(L) CN-EXT(N) CN-EXT GN/YL GN/YL Ty p e . 1 Ty p e . 1 In part "A", there are 3 types. In part "B", there are 3 [...]

  • Page 46

    - 46 - Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only F E B 753010 W50400 152302B 135312 330870 354210 349600B 546810 559011 549990 130411 554030 148000 135515 135800 135500A 567502 550140 249951 D 346810 152302A 359011 342800 149400 337000 349600A 263230A 263230B 435300A 43530[...]

  • Page 47

    In this Model Aluminum Condenser is applied. In case you need to replace the condenser follow the below mentioned steps: 1. Cover the brazing point (Section A) between copper pipe and aluminum pipe with wet towel. 2. Remove the copper pipe and copper connector of aluminum condenser(Section B) by brazing and replace the condenser with a new one. 3. [...]

  • Page 48

    P/NO : MFL42137114 FEBRUARY, 2008[...]