48VT--A, Catalog No 48VT---05SI | Carrier 48VT(N) specs

48VT-- A

Copyright 2009 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231	Edition Date: 04/09	Catalog No: 48VT---05SI

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.		Replaces: 48VT--- 04SI

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Carrier 48VT(N) installation instructions 48VT--A, Catalog No 48VT---05SI, Edition Date 04/09, Replaces 48VT---04SI

Contents

Fig. 1 - Unit 48VT-A TABLE OF CONTENTSSAFETY CONSIDERATIONS Installation Instructions Step 1 - Check Equipment RECEIVING AND INSTALLATIONINTRODUCTION Step 2 - Provide Unit Support A09146 Fig. 2 - 48VT-A24-30Unit Dimensions48VT--A A09147 Fig. 3 - 48VT-A36-60Unit Dimensions48VT--A SMALL CURB Fig. 4 - Roof Curb Dimensions48VT ROOF CURB DETAIL Inspection ACCESS PANELS MUST BE IN PLACE WHEN RIGGINGStep 5 - Rig and Place Unit Rigging/Lifting of Unit See Fig Step 6 - Connect Condensate Drain Step 7 - Install Flue HoodStep 8 - Install Gas Piping Fig. 6 - Condensate Trap Fig. 7 - Sediment Trap Step 9 - Install Duct ConnectionsConfiguring Units for Downflow Vertical Discharge FIRE OR EXPLOSION HAZARD 48VT--A Table 1 - Physical Data - Unit 48VT-AFig. 8 - Supply and Return Duct Opening Horizontal Duct Covers Table 3 - Heating Inputs Table 1 - Physical Data - Unit 48VT-ACont’dTable 2 - Maximum Gas Flow Capacity 48VT--A High-VoltageConnections Step 10 - Install Electrical ConnectionsSpecial Procedures for 208-VOperation Control Voltage Connections Transformer Protection Balance Point Setting-Thermidistator HybridPRE-START-UP Thermostat Step 1 - Check for Refrigerant Leaks Step 3 - Start-upHeating and Make Adjust- mentsSTART-UP Step 2 - Unit Sequence of Operation Check Heating Control Adjust Gas InputFig. 11 - Burner Assembly Check Gas Input Normal Operation Limit SwitchesCheck Burner Flame Airflow and Temperature Rise Checking and Adjusting Refrigerant Charge Step 4 - Start-upCooling and Make Adjust- mentsRollout Switch Indoor Airflow and Airflow Adjustments Table 6 - Color Coding for Indoor Fan Motor Leads Gas Heating Fan Speed Set-upContinuous Fan Operation 48VT--A 48VT--A Fig. 14 - Interface Fan Board IFBTable 8 - 48VT-AWet Coil Pressure Drop Table 7 - Filter Pressure Drop Table IN. W.C 48VT--A UNIT 48VT--A Heating 48VT--A 1295 48VT--A 1445 48VT--A 1448 Fig. 15 - 208/230-1-60Wiring Diagram, Unit 48VT-A 48VT A A09209 Fig. 16 - 208/230-3-60Wiring Diagram, Unit 48VT-A48VT--A 50VT500173 REV Fig. 17 - Cooling Charging Table-Subcooling48VT--A A09099 Air Filter MAINTENANCECleaning the Blower Motor and Wheel Indoor Blower and Motor Fig. 18 - Blower Housing and Flue Collector Box Limit SwitchInduced Draft combustion air Blower Assembly Fig. 19 - Unit Access Panels Refrigerant Circuit Electrical Controls and WiringOutdoor Fan Fig. 20 - Removal of Motor and Blower Wheel High-PressureSwitch Pressure SwitchesLoss of Charge Switch Gas InputPage Fig. 24 - Refrigerant Circuit HPS - High Pressure SwitchLCS - Loss of Charge Switch AccuraterMetering De vice UNIT OPERATION AND SAFETY HAZARD TROUBLESHOOTINGSTART-UPCHECKLIST Synthetic Roof Precautionary Procedure PURONR R-410AQUICK REFERENCE GUIDE 48VT--A SYMPTOM 48VT--A 48VT--A Table 12 - Troubleshooting Guide-HeatingTable 13 - Troubleshooting Guide-LEDStatus Codes TEMPERATURES Remove and Store in Job FilesI. PRELIMINARY INFORMATION MODEL NO PRESSURES Edition Date 04/09 48VT--ACatalog No 48VT---05SI Replaces 48VT---04SI

Carrier 48VT(N) 48VT--A, Catalog No 48VT---05SI, Edition Date 04/09, Replaces 48VT---04SI

Models: 48VT(N)

Edition Date: 04/09

Catalog No: 48VT---05SI

Replaces: 48VT--- 04SI