Lennox International Inc 4HP18LT manual Save these instructions for future reference

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INSTALLATION AND MAINTENANCE INSTRUCTIONS

4HP18LT Series

Split System Heat Pump

Save these instructions for future reference

WARNING

The equipment covered in this manual is to be installed by trained and experienced service and installation technicians. Improper installation, modification, service, or use can cause electrical shock, fire, explosion, or other conditions which may cause personal injury, death, or property damage. Use appropriate safety gear including safety glasses and gloves when installing this equipment.

WARNING

Risk of electrical shock. Disconnect all remote power supplies before installing or servicing any portion of the system. Failure to disconnect power supplies can result in property damage, personal injury, or death.

WARNING

Installation and servicing of air conditioning equipment can be hazardous due to internal refrigerant pressure and live electrical components. Only trained and qualified service personnel should install or service this equipment. Installation and service performed by unqualified persons can result in property damage, personal injury, or death.

WARNING

Sharp metal edges can cause injury. When installing the unit, use care to avoid sharp edges.

TABLE OF CONTENTS

 

INSTALLATION

2

CONNECTION DIAGRAM

4

START-UP

13

OPERATION

18

MAINTENANCE

23

Manufactured By

Allied Air Enterprises, Inc.

A Lennox International Inc. Company

215 Metropolitan Drive

West Columbia, SC 29170

*506470-01*

506470-01

Issue 1007

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Contents Lennox International Inc. Company Save these instructions for future referenceInstallation Clearances InstallationGeneral Torque TableSlab Mounting Electrical WiringSlab Mounting Roof MountingRefrigerant Piping Installing Refrigerant LineOutside Unit Placement & Installation PlacementLine Set Isolation Refrigerant Line Set DiametersRefrigerant Line Sets Installing Horizontal Runs Refrigerant Line Sets Transition from Vertical to Horizontal Required Euipment Flushing ProcedureExpansion Valve Systems Refrigerant Metering DeviceTo Close Liquid or Suction Line Service Valve To Access the Schrader PortEvacuation Using an Electronic Leak DetectorIssue START-UP Refrigerant Charge AdjustmentRefrigerant Charging Issue R410A Temperature/Pressure Chart Approach Values for TXV Systems Issue Operation Compressor Delay Defrost Control Timing PinsTime Delay Pressure Switch CircuitInterpreting the Diagnostic LEDs System Diagnostic ModuleLED Description 24VAC Power Wiring Miswired Module Codes Thermostat Demand WiringMaintenance Temperature Setting Levers Inspect and clean outdoor coilHomeowner Information System Switch Fan SwitchTemperature Indicator Indicating LightStart-Up and Performance Checklist Wire Diagram Issue