Carrier 50SD Install And Operation Instructions

Also see for 50SD: Operating and maintenance manual Owner's information manual

Contents

50SDSingle Packaged Electric Cooling UnitsInstallation, Start-Up, and Operating InstructionsSizes 024-060NOTE: Read the entire instruction manual before starting theinstallation.This symbol → indicates a change since the last issue.TABLE OF CONTENTSSAFETY CONSIDERATIONS .....................................................1RULES FOR SAFE INSTALLATION AND OPERATION.......2INTRODUCTION ..........................................................................2RECEIVING AND INSTALLATION ..........................................2Check Equipment......................................................................2IDENTIFY UNIT ................................................................2INSPECT SHIPMENT ........................................................2Provide Unit Support ................................................................2ROOF CURB.......................................................................2SLAB MOUNT ...................................................................2GROUND MOUNT ............................................................2Provide Clearances....................................................................2Field Fabricate Ductwork .........................................................2Rig and Place Unit....................................................................2INSPECTION ......................................................................4INSTALLATION ................................................................4Connect Condensate Drain .......................................................7Install Duct Connections ..........................................................7CONFIGURING UNITS FOR DOWNFLOW (VERTI-CAL) DISCHARGE ............................................................7Install Electrical Connection ....................................................9HIGH-VOLTAGE CONNECTIONS..................................9SPECIAL PROCEDURES FOR 208-V OPERATION .....9CONTROL VOLTAGE CONNECTIONS.........................9STANDARD CONNECTION ..........................................10TRANSFORMER PROTECTION....................................12PRE-START-UP ..........................................................................12START-UP ...................................................................................12CHECK FOR REFRIGERANT LEAKS..........................12START UP COOLING SECTION AND MAKE ADJUST-MENTS ..............................................................................12CHECKING COOLING CONTROL OPERATION .......12CHECKING AND ADJUSTING REFRIGERANTCHARGE ...........................................................................12INDOOR AIRFLOW AND AIRFLOW ADJUST-MENTS ..............................................................................14For 208/230V.....................................................................14COOLING SEQUENCE OF OPERATION.....................14MAINTENANCE.........................................................................14AIR FILTER......................................................................15EVAPORATOR BLOWER AND MOTOR.....................15CONDENSER COIL, EVAPORATOR COIL, AND CON-DENSATE DRAIN PAN ..................................................16CONDENSER FAN ..........................................................16ELECTRICAL CONTROLS AND WIRING ..................16REFRIGERANT CIRCUIT...............................................16EVAPORATOR AIRFLOW .............................................17METERING DEVICE — ACCURATER ........................17TROUBLESHOOTING ...............................................................17START-UP CHECKLIST............................................................17NOTE TO INSTALLER — Before the installation, READ THESEINSTRUCTIONS CAREFULLY AND COMPLETELY. Also,make sure the User’s Manual and Replacement Guide are left withthe unit after installation.SAFETY CONSIDERATIONSInstallation and servicing of air-conditioning equipment can behazardous due to system pressure and electrical components. Onlytrained and qualified personnel should install, repair, or serviceair-conditioning equipment.Untrained personnel can perform basic maintenance functions ofcleaning coils and filters. All other operations should be performedby trained service personnel. When working on air-conditioningequipment, observe precautions in the literature, tags, and labelsattached to the unit, and other safety precautions that may apply.Follow all safety codes. Wear safety glasses and work gloves. Usequenching cloth for unbrazing operations. Have fire extinguisheravailable for all brazing operations. Consult a qualified installer orservice agency for information or assistance. The qualified in-staller or agency must use only factory-authorized kits or acces-sories when modifying this product.Fig. 1—Model 50SDC99001Visit www.carrier.comManufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Book 1 6Tab 6 8 PC 101 Printed in U.S.A. Catalog No. 50SD-1SI Pg 1 8-05 Replaces: New