Carrier WEATHERMAKER 48A2020 - Page 90

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Fig. 19 — IGC Service Analysis Logic

LEGEND

NOTE: Thermostat Fan Switch in the

“AUTO” position.

IDM — Induced-Draft Motor

IGC — Integrated Gas Unit Controller

Main Page

Table of Contents1
Safety Considerations2
General3
Conventions Used in this Manual3
Basic Control Usage4
Comfortlink Controls4
Scrolling Marquee4
Accessory Navigator™ Display4
Operation5
CCN Tables and Display5
Start-Up7
Unit Preparation7
Unit Setup7
Internal Wiring7
Accessory Installation7
Crankcase Heaters7
Evaporator Fan7
Controls7
Gas Heat7
Controls Quick Start21
VAV Units Using Return Air Sensor or Space Temperature Sensor21
Multi-Stage Constant Volume (CV) Units with Mechanical Thermostat21
Multi-Stage Constant Volume Units with Space21
Sensor21
Economizer Options22
Indoor Air Quality (IAQ) Options22
Exhaust Options22
Programming Operating Schedules22
Service Test23
General23
Service Test Mode Logic24
Independent Outputs24
Fans in Service Test Mode24
Cooling in Service Test Mode24
Heating in Service Test Mode24
Humidi-Mizer System24
Third Party Control25
Thermostat25
Alarm Output25
Remote Switch25
VFD Control25
Supply Air Reset26
Demand Limit Control26
Demand Controlled Ventilation Control26
Controls Operation27
Modes27
Unit Configuration Submenu31
Cooling Control33
Heating Control50
Static Pressure Control56
Fan Status Monitoring60
Dirty Filter Switch60
Economizer60
Building Pressure Control66
Smoke Control Modes68
Indoor Air Quality Control69
Dehumidification and Reheat73
Humidi-Mizer Adaptive Dehumidification System75
Temperature Compensated Start76
Carrier Comfort Network (CCN) System77
Alert Limit Configuration78
Sensor Trim Configuration79
Discrete Switch Logic Configuration79
Display Configuration80
Remote Control Switch Input80
Hot Gas Bypass81
Space Temperature Offset81
Time Clock Configuration82
Hour and Minute (HH.MM)82
Month of Year (MNTH)82
Day of Month (DOM)82
Day of Week (DAY)82
Year (YEAR)82
Local Time Schedule (SCH.L)82
Local Holiday Schedules (HOL.L)83
Daylight Savings Time (DAY.S)83
Troubleshooting83
Complete Unit Stoppage83
Single Circuit Stoppage83
Service Analysis83
Restart Procedure83
Humidi-Mizer Troubleshooting84
Thermistor Troubleshooting84
Transducer Troubleshooting84
Forcing Inputs and Outputs98
Run Status Menu98
Alarms and Alerts101
Major System Components110
General110
Factory-Installed Components111
Accessory Control Components134
Service137
Service Access137
Cleaning137
Lubrication139
Evaporator Fan Performance Adjustment139
Evaporator Fan Coupling Assembly140
Evaporator Fan Service and Replacement141
Belt Tension Adjustment141
Evaporator-Fan Motor Replacement141
Condenser-Fan Adjustment141
Four-Inch Filter Replacement141
Power Failure142
Refrigerant Charge142
Thermostatic Expansion Valve (TXV)142
Gas Valve Adjustment149
Main Burners149
Filter Drier149
Replacement Parts149
Appendix A - Local Display Tables150
Appendix B - Ccn Tables161
Appendix C - Vfd Information178
Appendix D - Mode Selection Process186
Appendix E - Upc Open Controller187
- Low Ambient Motormaster V Control196
Appendix F - Optional Factory-Installed200
- Ambient Control206
Appendix G - Optional Greenspeed/Low207
Index222
Controls Setpoint and Configuration Log223
Form 48/50A-14T Pg229

Carrier WEATHERMAKER 48A2020 - Page 90

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