Manuals / LG Electronics / Household Appliance / Air Conditioner

LG Electronics LP121CEM-Y8 Features And Benefits, The Sleeve And The Rear Grille, Two Fan motors

Models: LP121CEM-Y8

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1.2 FEATURES AND BENEFITS

1.2 FEATURES 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.

THE SLEEVE AND THE REAR GRILLE

(Available as an option)

VERTICAL AIR DEFLECTOR	SLEEVE ASSEMBLY	REAR GRILLE
(Horizontal Louver)	(Including Aluminum Rear Grille)	(Aluminum Rear Grille)

AIR FILTER

INLET GRILLE (Air Intake)

EXPANDED METAL GRILLE (Superior for a performance)

•IIR (Infinite Impulse Response)

The IIR function senses the temperature several times per second and makes micro-adjustments several times per

•Compressor Restart Delay

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.

•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 indicating the problem when the unit is not operating properly with easy-to-read diagnostics. For example, 1 blink every 2 seconds indicates compressor failure.

Copyright ©2008 LG Electronics. Inc. All right reserved.	- 3 -
Only for training and service purposes	LGE Internal Use Only
Only for training and service purposes

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LG Electronics LP121CEM-Y8 Features And Benefits, The Sleeve And The Rear Grille, Compressor Restart Delay, Two Fan motors

Contents

Internal Use Only Window Air ConditionerSVC MANUAL MODEL LP121CEM-Y8LP121CEM-Y8 1. SpecificationLGE Internal Use Only ModelFan-Only Setting - High/Low 1.2 FEATURES AND BENEFITSTHE SLEEVE AND THE REAR GRILLE Compressor Restart DelayQuick Heater Recovery Door Switch/Occupancy SensorOutdoor Air Temperature Switchover Temperature limitsCOOLING ONLY MODEL 1.3 CONTROL LOCATIONSOPERATION ELECTRIC HEATING MODEL VENTILATIONADDITIONAL CONTROLS TEMPERATURE LIMITING1.4 ADDITIONAL CONTROLS REMOVING THE FRONT GRILLEREMOTE WALL THERMOSTAT REMOTE/LOCAL CONTROLENERGY SAVER FRONT DESK CONTROL2. Disassembly Instructions 2.1 MECHANICAL PARTS2.1.1 FRONT GRILLE 2.1.2 CONTROL BOX 2.2.1 ELECTRIC HEATER ELECTRIC HEATER MODEL ONLY 2.2 AIR HANDLING PARTS2.2.3 AXIAL FAN 2.2.2 CROSS FLOW FAN2.3.3 COMPRESSOR 2.3. ELECTRICAL PARTS2.2.4 SHROUD 2.3.1 OUTDOOR MOTOR2.3.6 P.C.B 2.3.5 POWER CORD2.4.3 CAPILLARY TUBE 2.4 REFRIGERATION CYCLE2.4.1 CONDENSER 2.4.2 EVAPORATORReplacement of the refrigeration cycle Figure 21 B-Charging Figure 21 A-Pulling VacuumDimension of sleeve assembly optional 3. Installation3.1 HOW TO INSTALL THE UNIT Dimension of air conditioner3.2 WALL SLEEVE INSTALLATION 3.2.1 Wall Case Installation DataGeneral Brick, Frame, Stucco and Shingle Construction Installation of Wall Case in Wall Opening3.2.2 PREPARATION OF THE FRONT GRILLE Preparation of the Wall Case for All Types of ConstructionLGE Internal Use Only Only for training and service purposesCord Set Connected FRAME AND BRICK VENEER INSTALLATIONSub-Base Connected WALL SECTION - DETAILED SIDE VIEW3.2.3 UNIT INSTALLATION 230/208 volt receptacle configuration 3.3.2 ELECTRICAL SAFETY3.3 ELECTRICAL REQUIREMENTS 3.3.1 ELECTRICAL DATA FOR 230/208V MODELDescription 4. FieldInstalledAccessoriesInstallation Control Panel Key LockReceiving Condensate Disposal Pump Kit InstallationInstallation DescriptionLGE Internal Use Only 10. Place the top cover assembly back into the unit15. Assembly the unit back following the reverse order of disassembly Pack Installationon any PTAC installation Architecture Grille Aluminum - SingleReceiving Drain InstallationCondensate Drain kit InstallationFigure 42 - Outdoor Drain Kit Installation Outdoor Drain Kit InstallationChecklist Indoor Drain Kit InstallationLeveling Legs InstallationFigure 49 - Leveling Leg Installation on Wall Sleeve Leveling Leg AssemblyFigure 48 - Leveling Leg Assembly Installation on Wall SleeveDescription Hard Wire KitJunction Box Kit Installation and Wiring Procedure InstallationFigure 52 - Electrical Wiring Routing 208/230 Volt Units265 Volt Units Figure 50 - Mounting Hard Wire Junction Box KitReceiving Remote Escutcheon KitInstallation DescriptionReceiving SubbaseInstallation Descriptionelectrical receptacle. Figure Figure 59 - DimensionsFigure 60 - Wiring Diagram The proper subbase must be ordered to obtain the correct5. TroubleshootingGuide 5.1 OUTSIDE DIMENSIONS5.2 PIPING SYSTEM Unit is running but cooling is ineffective Ineffective Cooling 5.3 TROUBLESHOOTING GUIDEFails to Start COMPLAINT CAUSEREMEDY REMEDY ROOM AIR CONDITIONER VOLTAGE LIMITSCOMPLAINT CAUSECOMPLAINT CAUSEREMEDY 6. PipingDiagrams Th2 Th1 HEAT EXCHANGER EVAPORATORCAPILLARY TUBE HEAT EXCHANGER CONDENSER COMPRESSOR 7.Schematic Diagram In part A, there are 3 typesIn part B, there are 3 types 8. ExplodedView assembling or CONDENSER OUTDOOR SERVICE REPLACEMENT PROCEDURECopper pipe Aluminum pipe Brazing point inFEBRUARY P/NO MFL42137114