Carrier 48EJ, EK, EW, EY024-048 installation instructions

Contents

Main Installation, Start-Up and Service Instructions CONTENTS SAFETY CONSIDERATIONS INSTALLATION Step 1 Provide Unit Support 48EJ,EK,EW,EY024-048 Single Package Rooftop Units Electric Cooling/Gas Heating Step2 Rig and Place Unit Step 3 Field Fabricate Ductwork Page Page Fig. 3 Base Unit Dimensions, 48EJ,EK024-034 Fig. 4 Base Unit Dimensions, 48EJ,EK038-048 Fig. 5 Base Unit Dimensions, 48EW,EY024-034 Fig. 6 Base Unit Dimensions, 48EW,EY038-048 Page Table 1 Physical Data Table 1 Physical Data (cont) Table 2 Evaporator Fan Motor Data (Units with Starting Serial Numbers 4197 and Later) Step 4 Install Flue Hood Fig. 8 Air Distribution Thru-the-Bottom Fig. 9 Air Distribution Thru-the-Side Fig. 10 Flue Hood Location Step5TrapCondensate Drain See Fig. 3-6 Step 6 Install Gas Piping Step 7 Controls Options Page Page Step 8 Make Electrical Connections Page Table 4 Electrical Data Table 4 Electrical Data (cont) Never operate a motor where a phase imbalance in supply volt- age is greater than 2%. Table 4 Electrical Data (cont) Never operate a motor where a phase imbalance in supply volt- age is greater than 2%. Page Page Page Step 9 Make Outdoor-Air Inlet Adjustments Page Page Page Page Step 10 Position Power Exhaust/Barometric ReliefDamper Hood Step 11 Install All Accessories START-UP Unit Preparation CompressorMounting Service Valves Internal Wiring PowerExhaust Direct Digital Controls DIP Switch Congura- tion Crankcase Heater EvaporatorFan CondenserFans and Motors Table 9 Power Exhaust Default Set Points Table 10 DIPSwitch Conguration Table 11 DIP Switch Factory Settings Page Page Page Table 15 Fan Performance Power Exhaust Table 16 Motor Limitations Return-Air Filters FilterReplacement Outdoor-AirInlet Screens EconomizerAdjustment Gas Heat Page Page Page Page SERVICE ServiceAccess Cleaning Lubrication Evaporator Fan Performance Adjustment (Fig.49) Evaporator Fan Service and Replacement Belt TensionAdjustment Evaporator-Fan Motor Replacement Condenser-Fan Adjustment Power Failure Refrigerant Charge ThermostaticExpansion Valve (TXV) Main Burners Filter Drier Protective Devices Relief Devices Power Circuit Control Circuit, 115-V Control Circuit, 24-V Compressor Lockout Logic LEGEND and NOTES for Fig. 56-60 Typical Wiring Schematics Page Page Page Page Page Page Page Page Page Diagnostic LEDs Table 25 I/O Channel Designations Base Module VAV Table 26 I/O Channel Designations Expansion Module (Field-Installed) CV and VAV PACKAGED SERVICE TRAINING START-UP CHECKLIST PRE-START-UP: START-UP