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Lennox International Inc 4HP18LT manual Issue, Page, 506470-01

Models: 4HP18LT

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506470-01

Issue 1007

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Lennox International Inc 4HP18LT manual Issue, Page, 506470-01

Contents

INSTALLATION AND MAINTENANCE INSTRUCTIONS TABLE OF CONTENTSINSTALLATION CONNECTION DIAGRAMInstallation Clearances FastenerTorque Stem CapsElectrical Wiring Slab MountingSlab Mounting Roof MountingInstalling Refrigerant Line Refrigerant PipingInstall unit away from windows Liquid Line Line Set Length and Size BTUH12 ft. 25 ft. 50 ft. 75 ft. 100 ft S uction Line Line S et Length and S ize B T UHWire Tie around vapor line only Floor Joist or Roof Rafter Tape or Wire Tie 8’Floor Joist or Roof Rafter Tape or Wire Tie Refrigerant Line Sets Installing Horizontal RunsHeavy Nylon Flushing Procedure Flushing ConnectionsFlushing Existing Line Set and Indoor Coil Required EuipmentMODEL 4HP18LT- 24 H4TXV01 4HP18LT - 36 H4TXV024HP18LT - 48, -60H4TXV03 Refrigerant Metering DeviceLiquid and Suction Line Service Valves Suction Line Ball Type Service ValveLeak Testing Manifold Gauge SetUsing an Electronic Leak Detector Evacuation4.Open both manifold valves and start vacuum pump START-UP Refrigerant Charge AdjustmentRefrigerant Charging Low pressure gauge to suction line service valve R410A Temperature/Pressure Chart Subcooling Values TableApproach Values for TXV Systems Table Issue L - Liquid S- SuctionPage 506470-01Filter Drier Crankcase HeaterEmergency Heat Function Room Thermostat Defrost SystemDefrost Control Timing Pins Compressor DelayTime Delay Pressure Switch CircuitSystem Diagnostic Module Interpreting the Diagnostic LEDsFlash Codes LED Description24VAC Power Wiring Flash Codes contThermostat Demand Wiring Miswired Module TroubleshootingMiswired Module Codes MAINTENANCE Inspect and clean outdoor coil In case of extended power outageTemperature Setting Levers HOMEOWNER INFORMATIONFan Switch System SwitchTemperature Indicator Preservice CheckStart-Upand Performance Checklist CoolingHeating Sequence of OperationWire Diagram Issue48630-001 PagePage Issue506470-01