Carrier WeatherExpert 48N2 Controls, Start-up, Operation, Service, And Troubleshooting
Also see for WeatherExpert 48N2: Controls, start-up, operation, service and troubleshooting instructionsInstallation instructionsInstallation instructionsInstallation instructions
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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Catalog No. 04-53480165-01 Printed in U.S.A. Form 48-50N-7T Pg 1 12-2020 Replaces: 48-50N-6TControls, Start-Up, Operation,Service and TroubleshootingCONTENTSPageSAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Conventions Used in This Manual . . . . . . . . . . . . . . . 4BASIC CONTROL USAGE . . . . . . . . . . . . . . . . . . . . . 4ComfortLink Controls . . . . . . . . . . . . . . . . . . . . . . . . . 4Navigator™ Display . . . . . . . . . . . . . . . . . . . . . . . . . . 4Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4System Pilot™ Interface . . . . . . . . . . . . . . . . . . . . . . . 5CCN Tables and Display . . . . . . . . . . . . . . . . . . . . . . . 5Unit Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Accessory Installation . . . . . . . . . . . . . . . . . . . . . . . . 7Crankcase Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Evaporator Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Gas Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7CONTROLS QUICK START . . . . . . . . . . . . . . . . . . . 27VAV Units Using Return Air Sensor or SpaceTemperature Sensor . . . . . . . . . . . . . . . . . . . . . . . 27Multi-Stage CV and SAV Units with MechanicalThermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Multi-Stage CV and SAV Units with Space Sensor . 27Economizer Configurations . . . . . . . . . . . . . . . . . . . 27Indoor Air Quality Configurations . . . . . . . . . . . . . . 28Exhaust Configurations . . . . . . . . . . . . . . . . . . . . . . 28Set Clock on VFD . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Programming Operating Schedules . . . . . . . . . . . . 29SERVICE TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Service Test Mode Logic . . . . . . . . . . . . . . . . . . . . . 29Independent Outputs . . . . . . . . . . . . . . . . . . . . . . . . 29Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Humidi-MiZer® System . . . . . . . . . . . . . . . . . . . . . . . 33Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34SERVICE COMPONENT TESTS . . . . . . . . . . . . . . . . 34Control Description (Overview) . . . . . . . . . . . . . . . . 34Auto-Component Test Control Descriptions . . . . . 34Digital Scroll Compressor (A1)Auto-Component Test . . . . . . . . . . . . . . . . . . . . . 35EXV Auto-Component Test . . . . . . . . . . . . . . . . . . . 35Refrigerant Charge Auto-Test (without LiquidSensors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36Minimum Load Valve Auto-Component Test . . . . . 36Supply Fan Auto-Component Test . . . . . . . . . . . . . .36THIRD PARTY CONTROL . . . . . . . . . . . . . . . . . . . . .37Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37Alarm Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37Remote Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37VFD Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37Supply Air Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37Demand Limit Control . . . . . . . . . . . . . . . . . . . . . . . .37Economizer/Outdoor Air Damper Control . . . . . . . .37CONTROLS OPERATION . . . . . . . . . . . . . . . . . . . . .39Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39Unit Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . .42Cooling Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44Heating Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60Static Pressure Control . . . . . . . . . . . . . . . . . . . . . . .69Fan Status Monitoring . . . . . . . . . . . . . . . . . . . . . . . .71Dirty Filter Switch . . . . . . . . . . . . . . . . . . . . . . . . . . .72Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73Building Pressure Control . . . . . . . . . . . . . . . . . . . .82Smoke Control Modes . . . . . . . . . . . . . . . . . . . . . . . .84Indoor Air Quality Control . . . . . . . . . . . . . . . . . . . . .84Humidification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88Dehumidification and Reheat . . . . . . . . . . . . . . . . . .89Humidi-MiZer Adaptive Dehumidification System . 90Temperature Compensated Start . . . . . . . . . . . . . . .93Carrier Comfort Network® (CCN) . . . . . . . . . . . . . . .93Alert Limit Configuration . . . . . . . . . . . . . . . . . . . . . .94Sensor Trim Configuration . . . . . . . . . . . . . . . . . . . .96Discrete Switch Logic Configuration . . . . . . . . . . . .97Display Configuration . . . . . . . . . . . . . . . . . . . . . . . .98VFD Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . 98Remote Control Switch Input . . . . . . . . . . . . . . . . .100Hot Gas Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . .100Space Temperature Offset . . . . . . . . . . . . . . . . . . .100TIME CLOCK CONFIGURATION . . . . . . . . . . . . . . .101Hour and Minute (HH.MM) . . . . . . . . . . . . . . . . . . . .101Month of Year (MNTH) . . . . . . . . . . . . . . . . . . . . . . .101Day of Month (DOM) . . . . . . . . . . . . . . . . . . . . . . . .101Day of Week (DAY) . . . . . . . . . . . . . . . . . . . . . . . . . .101Year (YEAR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101Local Time Schedule (SCH.L) . . . . . . . . . . . . . . . . .101Local Holiday Schedules (HOL.L) . . . . . . . . . . . . .101Daylight Savings Time (DAY.S) . . . . . . . . . . . . . . .101TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . .103Complete Unit Stoppage . . . . . . . . . . . . . . . . . . . . .103Single Circuit Stoppage . . . . . . . . . . . . . . . . . . . . .103WeatherExpert®48/50N2,N3,N4,N5,N6,N7,N8,N9Packaged Rooftop Cooling Units with Gas Heat,Optional Electric Heat, or Hydronic Heat andComfortLink Controls Version 10.x |
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