107 | Carrier 48/50AJ specification

a48--8357

Fig. 18 — Typical 2 Stage Gas Heat Wiring Schematic (Size 051 and 060 Units Shown)

107

Image 107

Carrier 48/50AJ specifications 107

Contents

Contents Controls, Start-Up, Operation, Service and Troubleshooting Safety Considerations Contents Sents pressing Enter to move into the next level GeneralBasic Control Usage Series Product Line Scrolling Marquee System Pilot User Interface Test START-UP Fan Performance 48AJ,AK027,030 and 48A2,A3025-030 Units Fan Performance 48AJ,AK020,025 and 48A2,A3020 Units Fan Performance 48AJ,AK036 Units Fan Performance 48AJ,AK,A2,A3035 Units Fan Performance 48AJ,AK041 Units Fan Performance 48AJ,AK,A2,A3040 Units Fan Performance 48AJ,AK051 Units Fan Performance 48AJ,AK,A2,A3050 Units Fan Performance 50AJ,AK020,025 and 50A2,A3020 Units Fan Performance 48AJ,AK,A2,A3060 Units Fan Performance 50AJ,AKA2,A3035 Units Fan Performance 50AJ,AK027,030 and 50A2,A3025-030 Units Fan Performance 50AJ,AK,A2,A3040 Units Fan Performance 50AJ,AK036 Units Fan Performance 50AJ,AK,A2,A3050 Units Fan Performance 50AJ,AK041 Units Fan Performance 50AJ,AK,A2,A3060 Units Fan Performance 50AJ,AK051 Units Fan Performance 48AW,AY027,030 and 48A4,A5025-030 Units Fan Performance 48AW,AY020,025 and 48A4,A5020 Units Fan Performance 48AW,AY036 Units Fan Performance 48AW,AY,A4,A5035 Units Fan Performance 48AW,AY041 Units Fan Performance 48AW,AY,A4,A5040 Units Fan Performance 48AW,AY051 Units Fan Performance 48AW,AY,A4,A5050 Units Fan Performance 50AW,AY020,025 and 50A4,A5020 Units Fan Performance 48AW,AY,A4,A5060 Units Fan Performance 50AW,AY,A4,A5035 Units Fan Performance 50AW,AY027,030 and 50A4,A5025-030 Units Fan Performance 50AW,AY,A4,A5040 Units Fan Performance 50AW,AY036 Units Fan Performance 50AW,AY,A4,A5050 Units Fan Performance 50AW,AY041 Units Fan Performance 50AW,AY,A4,A5060 Units Fan Performance 50AW,AY051 Units Air Quantity Limits 48AJ,AK,AW,AY,A2,A3,A4,A5 Motor Limitations Air Quantity Limits 50AJ,AK,AW,AY,A2,A3,A4,A5 Controls Quick StartPage Indoor Air Quality IAQ Options Service Test MLV Service Test Demand Controlled Ventilation Control Third Party Control Controls Operation Expansion Range CCN Point Operating Modes Display Table Hvac TYP = 6 SPT-2 STG TYP = 3 TSTAT-MULTI 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 Are VAV occupied cooling offsets under Setpoints Advanced Scroll Temperature Protection Label Cool Mode Evaluation LV.T Cool/Heat Set Point Offsets Configuration 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 PCT = MAT EDT/ C.CAP Run Status Mode Trip Helper Expansion Range Units CCN Point Write Status Run Status Cool Display Inputs→GEN.I→DL.S1 Inputs→GEN.I→DL.S2 Control will not attempt to learn MAT over time Expansion Range Units CCN Point Default Demand Limit Configuration FAN Relay 48/50A Unit Size Condenser Fan Staging Occupied Heating Enable OC.EN This configuration Heating Configuration Uhsp Expansion Range Units CCN Default Point Ohsp Expansion Units CCN Point Mode Trip Helper Table Unit Model no Staged Gas ConfigurationStaged Gas Heat 48AJ,AK,AW,AY Units Unit Size Relay Output Stage Staged Gas Heat 48A2,A3,A4,A5 Units Capacity IGC LED IndicatorsHvac mode = Tempering Vent LED Indication Error CodePage Static Pressure Control Configuration As an example, the static pressure reset limit SP.LM = Fan Status Monitoring Dirty Filter Switch Points Static Pressure Reset Related PointsFan Status Monitoring Configuration Outdoor Enthalpy Changeover None Custom Changeover Curve Example Economizer Configuration Table 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 = Expansion Range CCN Write Point Status PID Indoor Air Quality Control The indoor air quality IQ.A.F = 2 Fan On Occupied/Unoccupied IAQ Described above when DAQ is above the DAQ Fan On SetWill be turned off when DAQ is below the DAQ Fan Off Set Trol can also be set up to respond to a discrete IAQ input IAQ Purge Configuration → IAQ → IAQ.P → IQ.PG Dehumidification Configuration Indoor Air Quality Configuration Expansion Range Units CCN Point Temperature Compensated Start This logic isCarrier Comfort Network CCN System It Expansion Range Units Point Default CCN Configuration Sensor Trim Configuration Alert Limit Configuration Discrete Switch Logic Configuration The SW.LG Remote Switch Configuration Time Clock ConfigurationSwitch Logic Configuration Display Configuration Closed Remote Switch Logic ConfigurationOpen Time Clock Configuration Troubleshooting Compressor Cycles on LOW Pressure Cooling Service AnalysisProblem Solution Compressor does not RUN Compressor Stops on High Pressure Frosted Suction Line Unit Operates TOO Long or ContinuouslySystem is Noisy Compressor Loses OIL 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 Compressor Run Hours Display Table Mode Trip Helper Display TableCooling Information Display Table CCN/Linkage Display Table Expansion Range Units Point Write Status Vers Time Guard Display TableSoftware Version Numbers Display Table Expansion Range Units Point Write Status Tmgd P051 Alert and Alarm Codes CEM Check for welded contactor Verify CS wiring T122 Circuit a High Saturated Suction Temperature Page Page At Configuration→UNIT→SENS→FLT.S Major System Components Factory-Installed Components 102 103 104 105 Typical Auxiliary Control Box Wiring Schematic 106 ~~~ ~~~~ 107 108 109 110 111 112 113 Typical Power Schematic 48/50A2,A3,A4,A5060 Unit Shown 114 Typical Controls Option Wiring Schematic Typical Small Chassis Component Location Size 020-035 Units 115 Typical Large Chassis Component Locations Size 036-060 Units 116 117 118 Main Control Board MBB Inputs and Outputs 119 Economizer Control Board ECB1 Inputs and Outputs Outputs Sfanvfd VAV Control Board ECB2 Inputs and Outputs120 121 Staged Gas Control Board SCB Inputs and Outputs 122 Controls Expansion Board CEM InputsIGC Board Inputs and Outputs Terminal Function 123 Board SW1 SW2 SW3 SW4 ECB1 ECB2 SCB CEM W2 G124 125 Field Connection Terminal Strips IME 126 Hvac 127CID 128 Service Gas Heat Section Details Manufacturer Lubricant Lubrication 131 Evaporator Fan Service and ReplacementBelt Tension Adjustment To adjust belt tension Evaporator-Fan Motor Replacement Unit Refrigerant Size Liquid Condenser-Fan AdjustmentRound Tube, Plate Fin Unit Charge 132 133 Charging Chart 48/50A2,A3,A4,A5020 with R-410A Refrigerant 134 27 Ton Mchx Circuit a Charging Chart 135 Charging Chart 48/50A2,A3,A4,A5030 with R-410A Refrigerant 136 Charging Chart 48/50A2,A3,A4,A5035 with R-410A Refrigerant Charging Chart 48/50A2,A3,A4,A5050 with R-410A Refrigerant Charging Chart 48/50A2,A3,A4,A5040 with R-410A Refrigerant 138 Charging Chart 48/50A2,A3,A4,A5060 with R-410A Refrigerant Main Burner Removal Gas Valve Part Number EF33CW271 140 Mode RUN Status 141 Appendix a Local Display Tables 142 Description Range Units CCN Point Default 143 Mode Inputs 144 Mode Configuration →BP.SP 145 →SC.OV→SPT.O 146 147 Mode Time Clock 148 Appendix B CCN Tables 149 Appendix B CCN TablesStatus Display Tables Uinputs 150Display Name Range Units Point Name Write Status Temps Tstat 151 152 Config TablesName Range Units Point Name Default Schedovr Name Range Units Point Name Default Allm 153 SERVICE-CONFIG Tables Trim Name Range Units Point Name Default Heat154 155 Name Range Units Point Name Default Swlg Dmandlim Display Name Range Units Point Name Write Status ALARMS01ALARMS02 ALARMS03 ALARMS04 ALARMS05 Compresr 156 Ecdiag Maintenance Display Tables157 Display Name Range Units Point Name Write Status Econmin 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 166 Table C Fault Codes 167 Table D Alarm CodesReplace the cooling fan Restore power Table E Maintenance Intervals Fig. D Main Fan Replacement Frame Sizes R1-R4 169 Fig. F Internal Enclosure Fan Replacement Appendix D Mode Selection Process 171 Appendix E UPC Open Controller DS8 DS7 DS6 DS5 DS4 DS3 Table a SW3 Protocol Switch Settings For MS/TPTable B Baud Selection Table 172 173 Table C MS/TP Wiring RecommendationsAppendix E UPC Open Controller CMP Wiring Specifications Recommended Vendors and Part Numbers174 Rmcorp LED Status Table E LED Status IndicatorsRUN LED Error LED Status 175 Object Name Point Bacnet Point Name Read Units Default Range Object IDNetwork Points List 176 177 Appendix E UPC Open Controller Network Points List 178 179 Bacnet Point Name Read Units Default Range Object ID Only 180 181 182 183 Index Copyright 2010 Carrier Corporation Expansion Range Default Entry Controls SET Point and Configuration LOG CL-2 CL-3 CL-4 CL-5 PRE-START-UP Unit START-UP Checklist