Carrier WEATHERMAKER 48/50AJ

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104

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

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Table of Contents1
Safety Considerations2
General3
Conventions Used in this Manual3
Basic Control Usage3
Comfortlink Controls3
Scrolling Marquee4
Accessory Navigator™ Display4
Operation4
System Pilot™ Interface5
CCN Tables and Display5
- Generics Status Display Table5
Start-Up7
Unit Preparation7
Unit Setup7
Internal Wiring7
Accessory Installation7
Crankcase Heaters7
Evaporator Fan7
Controls7
Gas Heat7
Controls Quick Start27
Two-Stage Constant Volume Units with27
- Mechanical Thermostat27
- Space Sensor28
Variable Air Volume Units Using Return Air Sensor or Space Temperature Sensor28
Multi-Stage Constant Volume Units with28
- Mechanical Thermostat28
Economizer Options28
Indoor Air Quality Options29
Exhaust Options29
Programming Operating Schedules29
Service Test29
General29
Service Test Mode Logic29
Independent Outputs30
Fans in Service Test Mode30
Cooling in Service Test Mode30
Heating in Service Test Mode30
Third Party Control31
Thermostat31
Alarm Output31
Remote Switch31
VFD Control31
Supply Air Reset31
Demand Limit Control31
Demand Controlled Ventilation Control31
Controls Operation32
Modes32
- System Modes33
- Hvac Modes33
Unit Configuration Submenu35
Cooling Control37
- Setting up the System37
- Mechanical Cooling37
- Machine Dependent Configurations38
- Set Points38
- Supply Air Reset Configuration38
- Cooling Configuration39
- Compressor Safeties39
- Compressor Time Guards40
- Cool Mode Selection Process40
- Cooling Mode Diagnostic Help46
- Sumz Cooling Algorithm46
- Head Pressure Control49
- Economizer Integration with Mechanical Cooling50
Heating Control50
- Setting up the System50
- Temperature Driven Heat Mode Evaluation52
- Heat Mode Diagnostic Help52
- Integrated Gas Control Board Logic54
- Morning Warm up56
- Tempering Mode56
Static Pressure Control57
- Operation57
- Setting up the System57
- Static Pressure Reset Operation59
- Related Points59
Fan Status Monitoring59
- Setting up the System59
- Supply Fan Status Monitoring Logic60
Dirty Filter Switch60
Economizer60
- Setting up the System60
- Economizer Operation61
- Economizer Operation Configuration63
- Economizer Diagnostic Help63
Building Pressure Control63
- Building Pressure Configuration65
- Constant Volume 2-Stage Control65
- Multiple Power Exhaust Stage Building65
- Pressure Control Operation65
- Vfd Power Exhaust Building Pressure66
Smoke Control Modes66
- Fire-Smoke Inputs66
- Airflow Control During the Fire-Smoke Modes66
- Relevant Items67
- Setting up the System67
- Operation67
Indoor Air Quality Control67
Operation69
Dehumidification and Reheat69
Temperature Compensated Start71
- Temperature Compensated Start Logic71
Carrier Comfort Network71
- (CCN) System71
Alert Limit Configuration72
Sensor Trim Configuration73
Discrete Switch Logic Configuration74
Display Configuration74
Remote Control Switch Input74
Hot Gas Bypass75
Space Temperature Offset75
Time Clock Configuration75
Troubleshooting77
Complete Unit Stoppage77
Single Circuit Stoppage77
Service Analysis77
Restart Procedure77
Thermistor Troubleshooting77
Transducer Troubleshooting78
Forcing Inputs and Outputs90
Run Status Menu90
- Auto View of Run Status91
- Economizer Run Status91
- Cooling Information92
- Mode Trip Helper92
- Ccn/Linkage Display Table92
- Compressor Run Hours Display Table92
- Compressor Starts Display Table92
- Time Guard Display Table93
- Software Version Numbers Display Table93
Alarms and Alerts93
Major System Components101
General101
Factory-Installed Components101
Accessory Control Components124
Service128
Service Access128
Cleaning128
Lubrication130
Evaporator Fan Performance Adjustment130
Evaporator Fan Coupling Assembly130
Evaporator Fan Service and Replacement131
Belt Tension Adjustment131
Evaporator-Fan Motor Replacement131
Condenser-Fan Adjustment132
Four-Inch Filter Replacement132
Power Failure132
Refrigerant Charge132
Thermostatic Expansion Valve (TXV)132
Gas Valve Adjustment132
Main Burners139
Filter Drier139
Replacement Parts139
Appendix A - Local Display Tables140
Appendix A — Local Display Tables147
Appendix B - Ccn Tables148
Appendix B — Ccn Tables160
Appendix C - Vfd Information161
- Appendix C — Vfd Information169
- Appendix D - Mode Selection170
- Process170
Appendix E - Upc Open Controller171
- Appendix E — Upc Open Controller182
- Unit Start-Up Checklist183
Index183
Controls Set Point and Configuration Log185

Carrier WEATHERMAKER 48/50AJ - Page 104

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