Carrier WeatherExpert 48N2

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132

Fig. 27 — 48/50N Typical Modulating Gas Heat Unit Control Wiring

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Table of Contents1
Safety Considerations2
General3
Basic Control Usage4
Comfortlink Controls4
Navigator™ Display4
Operation4
Conventions Used in this Manual5
System Pilot™ Interface5
CCN Tables and Display5
- Generic Status Display Table5
Start-Up5
Unit Preparation5
Internal Wiring5
Accessory Installation6
Crankcase Heaters6
Evaporator Fan6
Controls6
Gas Heat6
Controls Quick Start27
Variable Air Volume Units Using Return Air27
- Sensor or Space Temperature Sensor27
Multi-Stage Constant Volume and Staged Air27
- Volume Units with Mechanical Thermostat27
- Volume Units Units with Space Sensor27
Economizer Configurations27
Indoor Air Quality Configurations28
Exhaust Configurations28
Set Clock on VFD28
Programming Operating Schedules29
Service Test29
General29
Service Test Mode Logic29
Independent Outputs29
Fans29
Actuators32
Humidi-Mizer32
Cooling32
- System32
Heating33
Service Component Tests33
Third Party Control39
Thermostat39
Alarm Output39
Remote Switch39
VFD Control39
Supply Air Reset39
Demand Limit Control39
Economizer/Outdoor Air Damper Control40
Controls Operation41
Modes41
- System Modes41
- Hvac Modes42
Unit Configuration44
Cooling Control46
- Setting up the System46
- Machine Dependent Configurations46
- Cooling Configuration49
- Cool Mode Selection Process50
- Cool Mode Diagnostic Help52
- Economizer Integration with Mechanical Cooling61
Heating Control61
- Post Filter Application61
- Setting up the System61
- Heat Mode Selection Process62
- Temperature Driven Heat Mode Evaluation62
- Heat Mode Diagnostic Help63
- Two-Stage Gas and Electric Heat Control63
- Hydronic Heating Control63
- Modulating Gas Heating Control64
- Scr Electric Heat Control64
- Control Board Information67
- Relocate Sat for Heating-Linkage Applications68
- Tempering Mode69
Static Pressure Control69
- Setting up the System69
- Related Points70
- Static Pressure Reset71
Fan Status Monitoring72
Dirty Filter Switch72
Economizer73
- Economizer Fault Detection and Diag73
- Differential Dry Bulb Cutoff Control74
- Economizer Self Test74
- Fdd Configurations75
- Setting up the System76
- Economizer Operation76
- Economizer Changeover Selection76
- Outdoor Air Cfm Control77
- Economizer Operation Configurations79
- Economizer Diagnostic Help80
Building Pressure Control80
- Setting up the System80
Smoke Control Modes82
- Fire Smoke Inputs82
- Airflow Control During Fire/Smoke82
- Smoke Control Configuration82
Indoor Air Quality Control83
- Pre-Occupancy Purge85
- Optional Airflow Station85
Humidification86
- Setting up the System86
- Configuring the Humidifier Actuator86
Dehumidification and Reheat87
- Setting up the System87
Humidi-Mizer88
- System88
- Adaptive Dehumidification88
- Operation89
- Humidi-Mizer Modes89
Temperature Compensated Start89
- Temperature Compensated Start Logic90
Carrier Comfort Network91
Alert Limit Configuration91
- (Ccn)91
Sensor Trim Configuration93
Discrete Switch Logic Configuration93
Display Configuration94
VFD Configurations95
Remote Control Switch Input96
Hot Gas Bypass97
Space Temperature Offset97
Time Clock Configuration97
Troubleshooting99
Complete Unit Stoppage99
Single Circuit Stoppage99
Service Analysis99
Restart Procedure99
Humidi-Mizer99
Thermistor Troubleshooting99
Transducer Troubleshooting102
Forcing Inputs and Outputs102
Run Status Menu102
- Auto View of Run Status112
- Economizer Run Status113
- Cooling Information113
- Exv Information Display Table114
- Vfd Information Display Table114
- Outdoor Fan Vfd Display Table114
- Mode Trip Helper114
- Ccn/Linkage Display Table115
- Compressor Run Hours Display Table115
- Compressor Starts Display Table115
Alarms and Alerts115
Major System Components127
General127
Factory-Installed Components127
Accessory Control Components149
Service152
Service Access152
Adjustments155
Cleaning158
Lubrication159
Refrigerant Feed Components159
Electronic Expansion Valve (EXV)159
Refrigeration Circuits159
Gas System Adjustment (48N Only)171
Moisture/Liquid Indicator171
Filter Drier172
Liquid Line Service Valves172
Protective Devices172
Temperature Relief Devices172
Control Circuit, 115 V172
Control Circuit, 24 V172
Gas Heat (48N Only)172
Compressor Removal173
Compressor Replacement173
Appendix A - Local Display Tables174
Appendix B - Ccn Tables188
Appendix C - Unit Staging Tables208
Appendix D - Vfd Information211
Appendix E - Mode Selection221
Process221
Option223
Appendix F - Bacnet Communication224
Option233
Appendix G - Optional Motormaster234
Control234
Index240
Controls Set Point and Configuration Log245
Unit Start-Up Checklist248

Carrier WeatherExpert 48N2 - Page 132

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