102 | Carrier 48/50AJ specification

RED JUMPER WIRE MUST BE ADDED

BETWEEN R AND W1 FOR UNITS

EQUIPPED WITH HEAT IN NON-THERMOSTAT

APPLICATIONS

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Fig. 15 — Typical Main Control Box Wiring Schematic (48/50AJ,AK,AW,AY Units)

a48-8355

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Image 102

Carrier 48/50AJ specifications 102

Contents

Controls, Start-Up, Operation, Service and Troubleshooting Contents Contents Safety Considerations Series Product Line GeneralBasic Control Usage Sents pressing Enter to move into the next level Scrolling Marquee System Pilot User Interface Test START-UP Fan Performance 48AJ,AK020,025 and 48A2,A3020 Units Fan Performance 48AJ,AK027,030 and 48A2,A3025-030 Units Fan Performance 48AJ,AK,A2,A3035 Units Fan Performance 48AJ,AK036 Units Fan Performance 48AJ,AK,A2,A3040 Units Fan Performance 48AJ,AK041 Units Fan Performance 48AJ,AK,A2,A3050 Units Fan Performance 48AJ,AK051 Units Fan Performance 48AJ,AK,A2,A3060 Units Fan Performance 50AJ,AK020,025 and 50A2,A3020 Units Fan Performance 50AJ,AK027,030 and 50A2,A3025-030 Units Fan Performance 50AJ,AKA2,A3035 Units Fan Performance 50AJ,AK036 Units Fan Performance 50AJ,AK,A2,A3040 Units Fan Performance 50AJ,AK041 Units Fan Performance 50AJ,AK,A2,A3050 Units Fan Performance 50AJ,AK051 Units Fan Performance 50AJ,AK,A2,A3060 Units Fan Performance 48AW,AY020,025 and 48A4,A5020 Units Fan Performance 48AW,AY027,030 and 48A4,A5025-030 Units Fan Performance 48AW,AY,A4,A5035 Units Fan Performance 48AW,AY036 Units Fan Performance 48AW,AY,A4,A5040 Units Fan Performance 48AW,AY041 Units Fan Performance 48AW,AY,A4,A5050 Units Fan Performance 48AW,AY051 Units Fan Performance 48AW,AY,A4,A5060 Units Fan Performance 50AW,AY020,025 and 50A4,A5020 Units Fan Performance 50AW,AY027,030 and 50A4,A5025-030 Units Fan Performance 50AW,AY,A4,A5035 Units Fan Performance 50AW,AY036 Units Fan Performance 50AW,AY,A4,A5040 Units Fan Performance 50AW,AY041 Units Fan Performance 50AW,AY,A4,A5050 Units Fan Performance 50AW,AY051 Units Fan Performance 50AW,AY,A4,A5060 Units Motor Limitations Air Quantity Limits 48AJ,AK,AW,AY,A2,A3,A4,A5 Controls Quick Start Air Quantity Limits 50AJ,AK,AW,AY,A2,A3,A4,A5Page Service Test Indoor Air Quality IAQ Options Service Test MLV Third Party Control Demand Controlled Ventilation Control Controls Operation Operating Modes Display Table Expansion Range CCN Point Hvac TYP = 3 TSTAT-MULTI TYP = 6 SPT-2 STG Unit Configuration Expansion Range Units CCN Point DefaultsThere will be no MAT calculation Under Configuration→UNIT Machine Dependent Configurations Supply Air Reset ConfigurationSetpoints Cooling Configuration Advanced Scroll Temperature Protection Label Are VAV occupied cooling offsets under Setpoints Cool Mode Evaluation Cool/Heat Set Point Offsets Configuration LV.T Stage Sequence 48/50AJ,AW020-027 Stage Sequence 48/50AJ,AW030-060Stage Sequence Staging Sequence with Hot Gas Bypass 48/50AK,AY030-060 Stage Sequence 48/50A2,A4020-027Stage Sequence 48/50A2,A4030-060 Staging Sequence with Hot Gas Bypass 48/50A3,A5030-060 Run Status Mode Trip Helper PCT = MAT EDT/ C.CAP Run Status Cool Display Expansion Range Units CCN Point Write Status Control will not attempt to learn MAT over time Inputs→GEN.I→DL.S1 Inputs→GEN.I→DL.S2 Demand Limit Configuration Expansion Range Units CCN Point Default Condenser Fan Staging FAN Relay 48/50A Unit Size Heating Configuration Occupied Heating Enable OC.EN This configuration Expansion Range Units CCN Default Point Ohsp Uhsp Mode Trip Helper Table Expansion Units CCN Point Unit Size Staged Gas ConfigurationStaged Gas Heat 48AJ,AK,AW,AY Units Unit Model no Staged Gas Heat 48A2,A3,A4,A5 Units Relay Output Stage LED Indication Error Code IGC LED IndicatorsHvac mode = Tempering Vent CapacityPage As an example, the static pressure reset limit SP.LM = Static Pressure Control Configuration Fan Status Monitoring Static Pressure Reset Related Points Fan Status Monitoring ConfigurationDirty Filter Switch Points None Outdoor Enthalpy Changeover Economizer Configuration Table Custom Changeover Curve Example Tstat 2 Stage SPT Multi-StagingSPT 2 Stage Economizer Run Status Table Building Pressure Configuration Power Exhaust Staging BP.CF =PE.A PE.B PE.C PID Expansion Range CCN Write Point Status Indoor Air Quality Control The indoor air quality Trol can also be set up to respond to a discrete IAQ input Described above when DAQ is above the DAQ Fan On SetWill be turned off when DAQ is below the DAQ Fan Off Set IQ.A.F = 2 Fan On Occupied/Unoccupied IAQ IAQ Purge Configuration → IAQ → IAQ.P → IQ.PG Indoor Air Quality Configuration Dehumidification Configuration Temperature Compensated Start This logic is Carrier Comfort Network CCN System ItExpansion Range Units CCN Point CCN Configuration Expansion Range Units Point Default Alert Limit Configuration Sensor Trim Configuration Discrete Switch Logic Configuration The SW.LG Display Configuration Time Clock ConfigurationSwitch Logic Configuration Remote Switch Configuration Remote Switch Logic Configuration OpenClosed Troubleshooting Time Clock Configuration Compressor Stops on High Pressure Cooling Service AnalysisProblem Solution Compressor does not RUN Compressor Cycles on LOW Pressure Compressor Loses OIL Unit Operates TOO Long or ContinuouslySystem is Noisy Frosted Suction Line Gas Heating Service Analysis Electric Heat Service AnalysisProblem Cause Remedy IGC Service Analysis Logic 5K Thermistor Temperature vs. Resistance SCT Sensors English 5K Thermistor Temperature vs. Resistance SCT Sensors SI 143 Pressure Voltage Psig Drop Pressure Voltage Psig Pressure Voltage Psig Drop 175 503 PCT = MAT EDT/C.CAP Auto View of Run Status Display Table Economizer Run Status Display TableExpansion Range Units Point Write Status CCN/Linkage Display Table Mode Trip Helper Display TableCooling Information Display Table Compressor Run Hours Display Table Expansion Range Units Point Write Status Tmgd Time Guard Display TableSoftware Version Numbers Display Table Expansion Range Units Point Write Status Vers Alert and Alarm Codes P051 CEM Check for welded contactor Verify CS wiring T122 Circuit a High Saturated Suction Temperature Page Page At Configuration→UNIT→SENS→FLT.S Factory-Installed Components Major System Components 102 103 104 Typical Auxiliary Control Box Wiring Schematic 105 ~~~ ~~~~ 106 107 108 109 110 111 112 Typical Power Schematic 48/50A2,A3,A4,A5060 Unit Shown 113 Typical Controls Option Wiring Schematic 114 115 Typical Small Chassis Component Location Size 020-035 Units 116 Typical Large Chassis Component Locations Size 036-060 Units 117 Main Control Board MBB Inputs and Outputs 118 Economizer Control Board ECB1 Inputs and Outputs 119 VAV Control Board ECB2 Inputs and Outputs 120Outputs Sfanvfd Staged Gas Control Board SCB Inputs and Outputs 121 Controls Expansion Board CEM Inputs IGC Board Inputs and Outputs122 123 Terminal Function W2 G 124Board SW1 SW2 SW3 SW4 ECB1 ECB2 SCB CEM Field Connection Terminal Strips 125 126 IME 127 CIDHvac Service 128 Gas Heat Section Details Lubrication Manufacturer Lubricant Evaporator-Fan Motor Replacement Evaporator Fan Service and ReplacementBelt Tension Adjustment To adjust belt tension 131 132 Condenser-Fan AdjustmentRound Tube, Plate Fin Unit Charge Unit Refrigerant Size Liquid Charging Chart 48/50A2,A3,A4,A5020 with R-410A Refrigerant 133 27 Ton Mchx Circuit a Charging Chart 134 Charging Chart 48/50A2,A3,A4,A5030 with R-410A Refrigerant 135 Charging Chart 48/50A2,A3,A4,A5035 with R-410A Refrigerant 136 Charging Chart 48/50A2,A3,A4,A5040 with R-410A Refrigerant Charging Chart 48/50A2,A3,A4,A5050 with R-410A Refrigerant Charging Chart 48/50A2,A3,A4,A5060 with R-410A Refrigerant 138 Gas Valve Part Number EF33CW271 Main Burner Removal Mode RUN Status 140 Appendix a Local Display Tables 141 Description Range Units CCN Point Default 142 Mode Inputs 143 Mode Configuration 144 145 →BP.SP 146 →SC.OV→SPT.O Mode Time Clock 147 Appendix B CCN Tables 148 Appendix B CCN Tables Status Display Tables149 Tstat 150Display Name Range Units Point Name Write Status Temps Uinputs 151 Name Range Units Point Name Default Allm Config TablesName Range Units Point Name Default Schedovr 152 SERVICE-CONFIG Tables 153 Name Range Units Point Name Default Heat 154Trim Name Range Units Point Name Default Swlg 155 156 Display Name Range Units Point Name Write Status ALARMS01ALARMS02 ALARMS03 ALARMS04 ALARMS05 Compresr Dmandlim Display Name Range Units Point Name Write Status Econmin Maintenance Display Tables157 Ecdiag 158 159 160 Appendix C VFD Information Table a VFD Terminal Designations161 Table B VFD Configurations Appendix C VFD InformationOver Ride Fig. C Standard Display Example Appendix C VFD Information Appendix C VFD Information Table C Fault Codes 166 Table E Maintenance Intervals Table D Alarm CodesReplace the cooling fan Restore power 167 Fig. D Main Fan Replacement Frame Sizes R1-R4 Fig. F Internal Enclosure Fan Replacement 169 Appendix D Mode Selection Process Appendix E UPC Open Controller 171 172 Table a SW3 Protocol Switch Settings For MS/TPTable B Baud Selection Table DS8 DS7 DS6 DS5 DS4 DS3 Table C MS/TP Wiring Recommendations Appendix E UPC Open Controller173 Rmcorp Wiring Specifications Recommended Vendors and Part Numbers174 CMP 175 Table E LED Status IndicatorsRUN LED Error LED Status LED Status 176 Bacnet Point Name Read Units Default Range Object IDNetwork Points List Object Name Point Appendix E UPC Open Controller Network Points List 177 178 Bacnet Point Name Read Units Default Range Object ID Only 179 180 181 182 Index 183 Copyright 2010 Carrier Corporation Controls SET Point and Configuration LOG Expansion Range Default Entry CL-2 CL-3 CL-4 CL-5 Unit START-UP Checklist PRE-START-UP