Carrier 50EZ-A Installation Instructions Manual

Also see for COMFORT 50EZ-A30: Owner's information manual Owner's information manual Product data Installation instructions

Installation Instructionsto the expe_NOTE: Read the entire instruction manual before starting theinstallation.NOTE: Installer: Make sure the Owner's Manual and ServiceInstructions are left with the unit after installation.TABLE OF CONTENTSPAGESAFETY CONSIDERATIONS ....................... 1-2INTRODUCTION ................................... 2RECEIVING AND INSTALLATION .................. 2-9Check Equipment .................................. 2Identify Unit .................................... 2Inspect Shipment ................................. 2Provide Unit Support ............................... 2Roof Curb ...................................... 2Slab Mount ..................................... 2Provide Clearances ................................. 2Rig and Place Unit ................................. 3Inspection ...................................... 3Rigging/Lifting of Unit ............................ 7Select and Install Ductwork ........................... 7Converting Horizontal Discharge Units to Downflow(Vertical) Discharge Units .......................... 8Provide for Condensate Disposal ...................... 9Install Electrical Connections ......................... 9High-Voltage Connections ......................... 9Special Procedures for 208-V Operation .............. 10Control Voltage Connections ....................... 10Standard Connections ............................ 10Transformer Protection ........................... 10Accessory Electric heaters Installation ................ 10PRE-START-UP ................................... 18START-UP ..................................... 18-24Checking Cooling & Heating Control Operation ........ 18Check for Refrigerant Leaks ......................... 18Start-Up Adjustments ............................. 1850EZ-A Sequence of Operation .................... 19Checking & Adjusting Refrigerant Charge ............ 19Indoor Airflow & Airflow Adjustments .............. 19Continuous Fan Operation ........................ 20Defrost Control ................................... 24Quiet Shift ..................................... 24Defrost ....................................... 24MAINTENANCE .................................. 24-Air Filter ........................................ 24Indoor Blower and Motor ........................... 24Outdoor Coil, Indoor Coil, & Condensate Drain Pan ...... 25Outdoor Fan ..................................... 25Electrical Controls and Wiring ....................... 27Refrigerant Circuit ................................. 27Indoor Airflow ................................... 28Metering Devices- TXV & Piston .................... 28Pressure Switches ................................. 28Loss of Charge Switch ............................. 28High Pressure Switch .............................. 28Copeland Scroll compressor (Puron Refrigerant) ......... 28A09034Fig. 1 - Unit 50EZ-ARefrigerant System ................................ 28Refrigerant .................................... 28Compressor Oil ................................. 28Servicing Systems on Roofs with Synthetic Materials .... 28Liquid Line Filter Drier ........................... 29Puron® (R-410A) Refrigerant Charging ............. 29System Information ................................ 29Loss of Charge Switch ............................ 29Check Defrost Thermostat ......................... 29TROUBLESHOOTING .............................. 29START-UP CHECKLIST ............................ 29SAFETY CONSIDERATIONSInstallation and servicing of this equipment can be hazardous dueto mechanical and electrical components. Only trained andqualified personnel 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.Follow all safety codes. Wear safety glasses, protective clothing,and work gloves. Use quenching cloth for brazing operations.Have a fire extinguisher available. Read these instructionsthoroughly and follow all warnings or cautions included inliterature and attached to the unit. Consult local building codes, thecurrent editions of the National Electrical Code (NEC) NFPA 70.In Canada refer to the current editions of the Canadian electricalCode CSA C22.1.Recognize safety information. This is the safety-alert symbol Z_.When you see this symbol on the unit and in instructions or manu-als, be alert to the potential for personal iniury. Understand thesesignal words: DANGER, WARNING, and CAUTION. Thesewords are used with the safety-alert symbol. DANGER identifiesthe most serious hazards which will result in severe personal iniury