Carrier 50XZ024 Installation, Start-up And Service Instructions Manual

Also see for 50XZ024: Manual

Contents

50XZ 024–060Single-Packaged Heat Pump Unitswith Puron® (R-410A) RefrigerantInstallation, Start-Up,and Service InstructionsNOTE: Read the entire instruction manual before starting theinstallation.This symbol → indicates a change since the last issue.TABLE OF CONTENTSSAFETY CONSIDERATIONS .....................................................2Introduction ....................................................................................2Receiving and Installation..............................................................2Check Equipment......................................................................2IDENTIFY UNIT ................................................................2INSPECT SHIPMENT ........................................................2Provide Unit Support ................................................................2ROOF CURB.......................................................................2SLAB MOUNT ...................................................................2GROUND MOUNT ............................................................2Provide Clearances....................................................................2Rig and Place Unit....................................................................3INSPECTION ......................................................................3INSTALLATION ................................................................4Select and Install Ductwork .....................................................5CONVERTING HORIZONTAL DISCHARGE UNITS TODOWNFLOW (VERTICAL) DISCHARGE UNITS.........7Provide for Condensate Disposal .............................................7Install Electrical Connections...................................................8HIGH-VOLTAGE CONNECTIONS..................................8ROUTING POWER LEADS INTO UNIT ........................9CONNECTING GROUND LEAD TO GROUND LUG ..9ROUTING CONTROL POWER WIRES (24-V) ..............9Easy Select™—50XZ .........................................................950XZ Sequence Of Operation...........................................17SPECIAL PROCEDURES FOR 208-V OPERATION ...17PRE-START-UP ..........................................................................18START-UP ...................................................................................1850XZ: Start-Up .......................................................................18Check for Refrigerant Leaks ..................................................19Start-Up Adjustments..............................................................19CHECKING COOLING AND HEATING CONTROL OP-ERATION ..........................................................................19CHECKING AND ADJUSTING REFRIGERANTCHARGE ...........................................................................19REFRIGERANT CHARGE ..............................................20NO CHARGE ....................................................................20LOW CHARGE COOLING .............................................20TO USE COOLING CHARGING CHARTS ..................20INDOOR AIRFLOW AND AIRFLOW ADJUST-MENTS ..............................................................................20Defrost Control .......................................................................20Quiet Shift..........................................................................20Defrost................................................................................20MAINTENANCE.........................................................................22Air Filter..................................................................................23Indoor Blower and Motor.......................................................23Outdoor Coil, Indoor Coil, and Condensate Drain Pan ........23Outdoor Fan ............................................................................24Electrical Controls and Wiring...............................................24Refrigerant Circuit ..................................................................24Indoor Airflow ........................................................................24Metering Devices–TXV & Accurater Piston.........................24Pressure Switches....................................................................25Loss of Charge Switch ...........................................................25High-Pressure Switch..............................................................25Copeland Scroll Compressor (Puron Refrigerant).................26Refrigerant System..................................................................26Refrigerant .........................................................................26Compressor Oil..................................................................26Servicing Systems on Roofs with Synthetic Materials ....26Liquid Line Filter Drier ....................................................26Puron (R-410A) Refrigerant Charging .............................26System Information.................................................................26Loss of Charge Switch ......................................................26Check Defrost Thermostat ................................................26TROUBLESHOOTING ...............................................................27Start-Up Checklist ........................................................................27NOTE TO INSTALLER — READ THESE INSTRUCTIONSCAREFULLY AND COMPLETELY before installing this unit.Also, make sure the Owner’s Manual and Service Instructions areleft with the unit after installation.Fig. 1—Unit 50XZC99064Visit www.carrier.comManufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Book 1 4Tab 5a 5a PC 101 Catalog No. 535–00114 Printed in U.S.A. Form 50XZ-2SI Pg 1 8–03 Replaces: 50XZ-1SI