LG Packaged Terminal Air Conditioner
Contents
1. J FAN CAPACITOR CN CN_ AUX_S IDPT gt U I Bs Zo vs c3 A 25 i EHEER 5 mo l b amp f ES ETET J o ERJ z Zo lS gt Si oF gt Do ee 2 J0 ibp oo lo a JTOF OO OF SN 2 G6O2 0F DT gg S OO ge eee i l A gt 3 3 EXTERNAL TRANS o o o FUSE250V 3 15A TRANS_BK DIP FUNCTION _ SUB PWB ASM P NO 6871A00086 000000 o00000 2 CNTRANS CN_AUX_S CN_THERMO_S 38388383 i i o0000 00000000 Unit Type 1 ouu FD2 FD1DR2DRIMS2MS1 GLGH O W Y R C 7 Unit Type 2 CN AUX Pi CN THERMO Additional Controls 4 The additional controls are located behind the option cover of control box The standard settings will be in the OFF position The authorized servicer has to check switches and ensure the switches are in the desired position REMOTE ON ON ON ON ON ON Remote Local Energy Saver Temperature Limit 1 Temperature Limit 2 Temperature Limit 3 PTAC PTHP LOCAL OFF OFF OFF 3 4 7 OFF OFF OFF 5 6 7 UNIT TYPE In part A there are 3 types Temperature Limi Temperature Limiting can save money by limiting the lowest temperature for cooling and the highest temperature2. Discharge capacitor before testing Test capacitor Replace if not within 10 of manufacturer s rating Replace if shorted open or damaged Will not rotate Fan blade hitting shroud or cross flow fan hitting scroll Realign assembly Units using slinger ring condenser fans must have 4 to 5 16 inch clearance to the base If it is hitting the base shim up the bottom of the fan motor with mounting screw s Check fan motor bearings if motor shaft will not rotate replace the motor Fan motor runs intermittently Revolves on overload 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 Fan motor noise Grommets Check grommets if worn or missing replace them Fan If cracked out of balance or partially missing replace it Turbo fan If cracked out of balance or partially missing Loose set screw replace it Tighten it Worn bearings If knocking sounds continue when running or loose replace the motor If the motor hums or noise appears to be internal while running replace motor COMPLAINT CAUSE REMEDY W PRESSURE SIDE LOW HI IN AN CHARGING CYLINDER A 20202020 Ze AAAA ALA 2 F
3. for heating The temperature limiting is controlled by switches 1 3 This temperature limiting is not available with the Remote Wall Thermostat Temperature Temperature Temperature Cooling Operation Heating Operation Limit 4 Limit 2 Limit 3 Lowest Temp Highest Temp Lowest Temp Highest Temp OFF OFF OFF 54 F 12 2 C 86 F 30 0 C 54 F 12 2 C 86 F 30 0 C ON OFF OFF 56 F 13 3 C 86 F 30 0 C 54 F 12 2 C 84 F 28 9 C OFF ON OFF 58 F 14 4 C 86 F 30 0 C 54 F 12 2 C 82 F 27 8 C ON ON OFF 60 F 15 5 C 86 F 30 0 C 54 F 12 2 C 80 F 26 7 C OFF OFF ON 62 F 16 6 C 86 F 30 0 C 54 F 12 2 C 78 F 25 5 C ON OFF ON 64 F 17 7 C 86 F 30 0 C 54 F 12 2 C 76 F 24 4 C OFF ON ON 66 F 18 9 C 86 F 30 0 C 54 F 12 2 C 74 F 23 3 ON ON ON 68 F 20 0 C 86 F 30 0 C 54 F 12 2 C 72 F 22 2 C 6 7 Unit Type OFF OFF Cooling Electric Heater Heat Pump OFF ON Cooling Electric Heater ON OFF Heat Pump Only ON ON Cooling Only Troubleshooting G 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 ineffecti
4. PACKAGED TERMINAL AIR CONDITIONER HEAT PUMP TECH SHEET Disconnect from Electrical S l A CAUTION ee Before Servicing Unit Electrical Requiremen 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 controls is still energized 3 Disconnect the power to the unit before servicing the unit 4 Remove the power cord from the wall receptacle 5 Remove or turn off the protective device fuses or circuit breaker Wirings including installation of the receptacle must comply with the NEC and local codes local regulations 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 These units are equipped with a three prong grounding plug on the power supply cord which must be plugged into a matching properly grounded three prong wall receptacle for your protection against possible shock hazard If such an outlet is not present one must be installed by a qualified electrician in accordance with the National Electrical Code and local codes and ordinances NOTE DO NOT USE AN EXTENSION CORD on 208 230 and 208 230 Volt units Self Diagnosis FUNCTION If the unit has a malfunction a green OPERATION LED located on the Display PCB used by the unit to indicate the errors USE If the customer has to register a complaint to the service center he can be very clear about reg
5. f tube about 2 inches from the pinch off tool Use sil fos solder and solder pinch off tube closed Turn off the unit allow it to set for a while and then test the leakage of the pinch off connection 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 E CONDENSER COMPOUND GAUG HIGH PRESSURE SIDE MANIFOLD GAUGE EXTERNAL VACUUM PUMP SEE INSETS BELOW aie Figure 1 Pulling Vacuum COMPLAINT CAUSE REMEDY Fan motor will not run lt Indoor motor gt BR OR YL BKH BL MID RD LO Resistance of coil at 75 C Q No power Power supply cord Check voltage at outlet Correct if none 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 Replace switch if defective OBM 2504U1 OBM 2202U1 Main 340 Main 813 C1 52 8 C1 52 C2 39 6 C2 52 SUB 208 SUB 264 lt Outdoor motor gt S54 BKH Resistance of coil at 75 C Q OBM 3018U1 Main 165 C1 48 2 C2 48 2 SUB 63 0 Wire disconnected or connection loose Connect wire Refer to wiring diagram for terminal identification Repair or replace loose terminal Capacitor
6. igure 2 Charging Compressor will not run but fan motor runs Voltage Check voltage See the limits on the preceding 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 Check wire locations If not per wiring diagram correct Rotary Check for continuity refer to the wiring diagram for terminal identification Replace the switch if circuit is open Thermostat Check the 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 Capacitor Discharge capacitor before Check the capacitor Replace if not within 10 of manufacturers servicing rating Replace if shorted open or damaged Check the compressor for open circuit or Compressor ground If open or grounded replace the compressor Overload Check the compressor overload if externally mounted Replace if open If the compressor temperature is high remove the overload cool it and retest ROOM AIR CONDITIONER VOLTAGE LIMITS 208 230V NAME PLATE RATING MINIMUM MAXIMUM 187V 252V P No 3850A20594H
7. istering the complaint that what is happening amp by referring the user s manual the customer can clearly define the problem So that the engineer should go fully prepared with the prescribled tools to be used regarding that problem It also keeps the customer aware about the unit Here are some of the problems defined below for which the LED indicates by flashing number of times the error has been reconrded against it The errors are the mentioned which is as follows ON Normal OFF No power failed board Fault Codes CH 01 Indoor Air Thermistor Error CH 02 Indoor Coil Thermistor Error CH 03 Outdoor Air Thermistor Error PIHP Only CH 04 Outdoor Coil Thermistor Error PIHP Only CH 05 Mode Error CH 06 Setpoint Error CH 07 Bad Thermistor Wiring Schematic Diagram POWER INPU NEUTRAL LIVE T WH Th GN YL TB3 PN BK TB4 OR BK TB1 Q WH Jg TB2 rm WH OR WH l away B l A VALVE SOLENoIDg BK SSS SS oS Se a Gav INDOOR COIL THERMISTOR Poa INDOOR AIR THERMISTOR RY_HEAT2 00000 00000 CN_ oo THERMO_S SS Q o LLYJH AW LVAH AY G o 5 o Sjo 5 LM aah AGO AY YO AH AVM Ad HAG AY 7401 AW f 4dO NO YO NO AYMt NO sid NO D x Q O v LXI N U it
8. lacement of fan motor v Irregular motor resistance 2 l Regular but fails to start Irregular motor insulation 2 Replacement of compressor locking of rotor metal Replacement of compressor Motor damaged 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 Leave the valve in place after servicing the system 2 After discharging the unit completely remove the desired component and unbraze the pinch off tubes 3 Solder service valves into the pinch off tube ports leaving the valves open 4 Solder the pinch off tubes with service valves 5 Evacuate as follows 1 Connect the vacuum pump as illustrated Figure 1 2 Start the vacuum pump slowly open manifold valves A and B with two full turns counterclockwise and leave the valves closed The vacuum pump is now pulling through valves A and B up to valve C by means of the manifold and entire system A CAUTION If high vacuum equipment is used just crack valves A and B for a few minutes then open slowly with the two full turns counterclockwise This will keep oil from foaming and being drawn into the vacuum pump 3 Operate the vacuum pump for 20 to 30 minutes until 600 microns
9. of vacuum are obtained Close valves A and B and observe the vacuum gauge for a few minutes A rise in pressure would indicate a possible leak or moisture remaining in the system With valves A and B closed stop the vacuum pump 4 Remove the hose from the vacuum pump and place it on the charging cylinder See Figure 2 Open valve C Discharge the line at 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 2 With valve C open discharge the hose at the manifold connection 3 Open valve A and allow the proper charge to enter the system Valve B is still closed 4 If more charge is required the high side will not take it Close valve A 5 With the unit running open valve B and add the balance of the charge a Do not add the liquid refrigerant to the low side b Watch the low side gauge allow pressure to rise to 30 lbs c Turn off valve B and allow pressure to drop d Repeat steps B and C until the balance of the charge is in the system 6 When satisfied the unit is operating correctly use the pinch off tool with the unit still running and clamp on to the pinch off tube Using a tube cutter cut the pinch of
10. ve Ineffective Cooling v Y Check of outdoor coil heat exchanger amp the fan Check heat load increase Unexpected residue Check gas leakage l y x AA Overloaded Circuit Malfunction of fan Repair gas leak l AA Clogged of air filter v Replacement of unit if the unit is beyond repair Check of cold air circulation for smooth flow Dirty indoor coil Heat exchanger Check of inside gas pressure Adjusting of refrigerant charge AA Malfunction of compressor l Replacement of compressor Obstruction at air outlet Correct above trouble Check clogging in refrigeration circuit y Satisfactory operation with temperature difference of inlet amp outlet air 44 6 50 F Repair clogging in i refrigeration circuit 7 10 C Fails to Start Check power source Check circuit breaker and fuse Gas leak f feeler bulb Check control switch e oie setting Check control switch Only compressor fails to y EG Only fan fails to start Drop of power voltage kK Improper wiring gt Improper thermostat setting Defect of compressor capacitor Defect of fan motor capacitor Loose terminal connection Check capacitor Irregular motor resistance Irregular motor insulation Improper wiring Replacement _Repiacement A Rep
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