Carrier 48DU Installation Instructions Manual

Also see for 48DU Series: Owner's information manual

Contents

Carrier 48DU Installation Instructions Manual Manual pdf 1 page image

148DUInfinityt 14 Single--Packaged Air Conditioner andGas Furnace System With Puron® (R--410A) Refrigerant2 to 5 Nominal Tons (Sizes 024--060)Installation InstructionsIMPORTANT: OAT sensor must be field installed. SeeAccessory Installation for more details.IMPORTANT: This Infinityt unit is designed for use with anInfinity User Interface.NOTE: Read the entire instruction manual before starting theinstallation.TABLE OF CONTENTSPageSAFETY CONSIDERATIONS 2. . . . . . . . . . . . . . . . . . . . . . . .INTRODUCTION 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .RECEIVING AND INSTALLATION 2--12. . . . . . . . . . . . . . . .Check Equipment 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Identify Unit 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Inspect Shipment 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Provide Unit Support 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Roof Curb 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Slab Mount 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Ground Mount 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Provide Clearances 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Rig and Place Unit 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Inspection 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Introduction 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Use of Rigging Bracket 8. . . . . . . . . . . . . . . . . . . . . . . . . . .Select and Install Ductwork 8. . . . . . . . . . . . . . . . . . . . . . . . . .Converting Horizontal Discharge Units to Downflow(Vertical) Discharge Units 9. . . . . . . . . . . . . . . . . . . . . . . . .Provide for Condensate Disposal 10. . . . . . . . . . . . . . . . . . . .Install Flue Hood 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Install Gas Piping 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Install Electrical Connections 11. . . . . . . . . . . . . . . . . . . . . . .High--Voltage Connections 11. . . . . . . . . . . . . . . . . . . . . . .Routing Power Leads Into Unit 12. . . . . . . . . . . . . . . . . . . .Connecting Ground Lead to Ground Screw 12. . . . . . . . . .Routing Control Power Wires 12. . . . . . . . . . . . . . . . . . . .Accessory Installation 12. . . . . . . . . . . . . . . . . . . . . . . . . . .Special Procedures for 208--v Operation 12. . . . . . . . . . . . .PRE--START--UP 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .START--UP 15--25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Unit Start--Up and Troubleshooting 15. . . . . . . . . . . . . . . . . .Sequence of Operation 19--24. . . . . . . . . . . . . . . . . . . . . . . . .Check for Refrigerant Leaks 24. . . . . . . . . . . . . . . . . . . . . . . .Start--Up Adjustments 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . .Checking Cooling and Heating Control Operation 25. . . . .Checking and Adjusting Refrigerant Charge 25. . . . . . . . . .Refrigerant Charge 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . .No Charge 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Low Charge Cooling 25. . . . . . . . . . . . . . . . . . . . . . . . . . . .To Use Cooling Charging Charts 25. . . . . . . . . . . . . . . . . . .Non--Communicating Emergency Cooling/Heating Mode 25.MAINTENANCE 27--29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Air Filter 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Indoor Fan and Motor 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . .Inducer Blower 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Limit Switch 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A05307Fig. 1 -- Unit 48DUBurner Ignition 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Main Burners 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Inducer Pressure Switch 27. . . . . . . . . . . . . . . . . . . . . . . . . . .Outdoor Coil, Indoor Coil, and Condensate Drain Pan 28. . . .Outdoor Fan 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Electrical Controls and Wiring 28. . . . . . . . . . . . . . . . . . . . . .Refrigerant Circuit 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Indoor Airflow 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Pressure Switches 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Loss--of--Charge Switch 28. . . . . . . . . . . . . . . . . . . . . . . . . . .High--Pressure Switches 28. . . . . . . . . . . . . . . . . . . . . . . . . . .Copeland Scroll Compressor (Puron® Refrigerant) 29. . . . . . .Refrigerant System 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Refrigerant 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Compressor Oil 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Servicing Systems on Roofs with Synthetic Materials 29. . .Liquid--Line Filter Drier 29. . . . . . . . . . . . . . . . . . . . . . . . .Puron (R--410A) Refrigerant Charging 29. . . . . . . . . . . . . .TROUBLESHOOTING 29--31. . . . . . . . . . . . . . . . . . . . . . . . . .FINAL CHECKS 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CARE AND MAINTENANCE 31. . . . . . . . . . . . . . . . . . . . . . .START--UP CHECKLIST 35. . . . . . . . . . . . . . . . . . . . . . . . . . .SAFETY CONSIDERATIONSInstallation and servicing of this equipment can be hazardous due tomechanical and electrical components. Only trained and qualifiedpersonnel should install, repair, or service this equipment.Untrained personnel can perform basic maintenance functions, suchas cleaning and replacing air filters. All other operations must beperformed by trained service personnel. When working on thisequipment, observe precautions in the literature, on tags, and onlabels attached to or shipped with the unit and other safetyprecautions that may apply.