104 | Carrier 48/50AJ guide

104

a48-8355

Fig. 16 — Typical Main Control Box Wiring Schematic (48/50A2,A3,A4,A5 Units)

Image 104

Carrier 48/50AJ specifications 104

Contents

Controls, Start-Up, Operation, Service and Troubleshooting Contents Contents Safety Considerations General Basic Control UsageSeries Product Line 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 There will be no MAT calculation Unit ConfigurationExpansion Range Units CCN Point Defaults Under Configuration→UNIT Setpoints Machine Dependent ConfigurationsSupply Air Reset Configuration 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 Stage Sequence 48/50AJ,AW020-027Stage Sequence 48/50AJ,AW030-060 Stage Sequence 48/50A2,A4030-060 Staging Sequence with Hot Gas Bypass 48/50AK,AY030-060Stage Sequence 48/50A2,A4020-027 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 Staged Gas Configuration Staged Gas Heat 48AJ,AK,AW,AY UnitsUnit Size Unit Model no Staged Gas Heat 48A2,A3,A4,A5 Units Relay Output Stage IGC LED Indicators Hvac mode = Tempering VentLED Indication Error Code CapacityPage As an example, the static pressure reset limit SP.LM = Static Pressure Control Configuration Fan Status Monitoring Dirty Filter Switch Points Static Pressure Reset Related PointsFan Status Monitoring Configuration None Outdoor Enthalpy Changeover Economizer Configuration Table Custom Changeover Curve Example SPT 2 Stage Tstat 2 StageSPT Multi-Staging Economizer Run Status Table PE.A PE.B PE.C Building Pressure ConfigurationPower Exhaust Staging BP.CF = PID Expansion Range CCN Write Point Status Indoor Air Quality Control The indoor air quality Described above when DAQ is above the DAQ Fan On Set Will be turned off when DAQ is below the DAQ Fan Off SetTrol can also be set up to respond to a discrete IAQ input IQ.A.F = 2 Fan On Occupied/Unoccupied IAQ IAQ Purge Configuration → IAQ → IAQ.P → IQ.PG Indoor Air Quality Configuration Dehumidification Configuration Expansion Range Units CCN Point Temperature Compensated Start This logic isCarrier Comfort Network CCN System It CCN Configuration Expansion Range Units Point Default Alert Limit Configuration Sensor Trim Configuration Discrete Switch Logic Configuration The SW.LG Time Clock Configuration Switch Logic ConfigurationDisplay Configuration Remote Switch Configuration Closed Remote Switch Logic ConfigurationOpen Troubleshooting Time Clock Configuration Cooling Service Analysis Problem Solution Compressor does not RUNCompressor Stops on High Pressure Compressor Cycles on LOW Pressure Unit Operates TOO Long or Continuously System is NoisyCompressor Loses OIL Frosted Suction Line Problem Cause Remedy Gas Heating Service AnalysisElectric Heat Service Analysis 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 Expansion Range Units Point Write Status Auto View of Run Status Display TableEconomizer Run Status Display Table Mode Trip Helper Display Table Cooling Information Display TableCCN/Linkage Display Table Compressor Run Hours Display Table Time Guard Display Table Software Version Numbers Display TableExpansion Range Units Point Write Status Tmgd 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 Outputs Sfanvfd VAV Control Board ECB2 Inputs and Outputs120 Staged Gas Control Board SCB Inputs and Outputs 121 122 Controls Expansion Board CEM InputsIGC Board Inputs and Outputs 123 Terminal Function Board SW1 SW2 SW3 SW4 ECB1 ECB2 SCB CEM W2 G124 Field Connection Terminal Strips 125 126 IME Hvac 127CID Service 128 Gas Heat Section Details Lubrication Manufacturer Lubricant Evaporator Fan Service and Replacement Belt Tension Adjustment To adjust belt tensionEvaporator-Fan Motor Replacement 131 Condenser-Fan Adjustment Round Tube, Plate Fin Unit Charge132 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 148 149 Appendix B CCN TablesStatus Display Tables 150 Display Name Range Units Point Name Write Status TempsTstat Uinputs 151 Config Tables Name Range Units Point Name Default SchedovrName Range Units Point Name Default Allm 152 SERVICE-CONFIG Tables 153 Trim Name Range Units Point Name Default Heat154 Name Range Units Point Name Default Swlg 155 Display Name Range Units Point Name Write Status ALARMS01 ALARMS02 ALARMS03 ALARMS04 ALARMS05 Compresr156 Dmandlim Maintenance Display Tables 157Display Name Range Units Point Name Write Status Econmin Ecdiag 158 159 160 161 Appendix C VFD InformationTable a VFD Terminal Designations Over Ride Table B VFD ConfigurationsAppendix C VFD Information Fig. C Standard Display Example Appendix C VFD Information Appendix C VFD Information Table C Fault Codes 166 Table D Alarm Codes Replace the cooling fan Restore powerTable E Maintenance Intervals 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 Table a SW3 Protocol Switch Settings For MS/TP Table B Baud Selection Table172 DS8 DS7 DS6 DS5 DS4 DS3 173 Table C MS/TP Wiring RecommendationsAppendix E UPC Open Controller Wiring Specifications Recommended Vendors and Part Numbers 174Rmcorp CMP Table E LED Status Indicators RUN LED Error LED Status175 LED Status Bacnet Point Name Read Units Default Range Object ID Network Points List176 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