Carrier 48VT(N) Maintenance, Air Filter, Indoor Blower and Motor, 48VT--A, Unit Operation Hazard

Contents Installation Instructions TABLE OF CONTENTSSAFETY CONSIDERATIONS Fig. 1 - Unit 48VT-AStep 2 - Provide Unit Support RECEIVING AND INSTALLATIONINTRODUCTION Step 1 - Check EquipmentFig. 2 - 48VT-A24-30Unit Dimensions 48VT--AA09146 Fig. 3 - 48VT-A36-60Unit Dimensions 48VT--AA09147 ROOF CURB DETAIL Fig. 4 - Roof Curb Dimensions48VT SMALL CURBRigging/Lifting of Unit See Fig ACCESS PANELS MUST BE IN PLACE WHEN RIGGINGStep 5 - Rig and Place Unit InspectionFig. 6 - Condensate Trap Step 7 - Install Flue HoodStep 8 - Install Gas Piping Step 6 - Connect Condensate DrainFIRE OR EXPLOSION HAZARD Step 9 - Install Duct ConnectionsConfiguring Units for Downflow Vertical Discharge Fig. 7 - Sediment TrapHorizontal Duct Covers Table 1 - Physical Data - Unit 48VT-AFig. 8 - Supply and Return Duct Opening 48VT--A48VT--A Table 1 - Physical Data - Unit 48VT-ACont’dTable 2 - Maximum Gas Flow Capacity Table 3 - Heating InputsControl Voltage Connections Step 10 - Install Electrical ConnectionsSpecial Procedures for 208-VOperation High-VoltageConnectionsThermostat Balance Point Setting-Thermidistator HybridPRE-START-UP Transformer ProtectionStep 2 - Unit Sequence of Operation Step 3 - Start-upHeating and Make Adjust- mentsSTART-UP Step 1 - Check for Refrigerant LeaksCheck Gas Input Adjust Gas InputFig. 11 - Burner Assembly Check Heating ControlAirflow and Temperature Rise Limit SwitchesCheck Burner Flame Normal OperationIndoor Airflow and Airflow Adjustments Step 4 - Start-upCooling and Make Adjust- mentsRollout Switch Checking and Adjusting Refrigerant Charge48VT--A Gas Heating Fan Speed Set-upContinuous Fan Operation Table 6 - Color Coding for Indoor Fan Motor LeadsTable 7 - Filter Pressure Drop Table IN. W.C Fig. 14 - Interface Fan Board IFBTable 8 - 48VT-AWet Coil Pressure Drop 48VT--AUNIT 48VT--AHeating 48VT--A1295 48VT--A1445 48VT--A1448 48VT--A48VT A Fig. 15 - 208/230-1-60Wiring Diagram, Unit 48VT-AFig. 16 - 208/230-3-60Wiring Diagram, Unit 48VT-A 48VT--AA09209 A09099 Fig. 17 - Cooling Charging Table-Subcooling48VT--A 50VT500173 REVIndoor Blower and Motor MAINTENANCECleaning the Blower Motor and Wheel Air FilterFig. 19 - Unit Access Panels Limit SwitchInduced Draft combustion air Blower Assembly Fig. 18 - Blower Housing and Flue Collector BoxFig. 20 - Removal of Motor and Blower Wheel Electrical Controls and WiringOutdoor Fan Refrigerant CircuitGas Input Pressure SwitchesLoss of Charge Switch High-PressureSwitchPage AccuraterMetering De vice HPS - High Pressure SwitchLCS - Loss of Charge Switch Fig. 24 - Refrigerant CircuitSynthetic Roof Precautionary Procedure TROUBLESHOOTINGSTART-UPCHECKLIST UNIT OPERATION AND SAFETY HAZARD48VT--A PURONR R-410AQUICK REFERENCE GUIDE48VT--A SYMPTOMTable 12 - Troubleshooting Guide-Heating Table 13 - Troubleshooting Guide-LEDStatus Codes48VT--A PRESSURES Remove and Store in Job FilesI. PRELIMINARY INFORMATION MODEL NO TEMPERATURESReplaces 48VT---04SI 48VT--ACatalog No 48VT---05SI Edition Date 04/09