Carrier WeatherExpert 48N2 Controls, Start-up, Operation, Service And Troubleshooting Instructions
Also see for WeatherExpert 48N2: Installation instructionsInstallation instructionsControls, start-up, operation, service, and troubleshootingInstallation instructions
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Contents
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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. 04-53480114-01 Printed in U.S.A. Form 48/50N-2T Pg 1 7-14 Replaces: 48/50N-1TControls, Start-Up, Operation,Service and TroubleshootingCONTENTSPageSAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . .2,3GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3,4BASIC CONTROL USAGE . . . . . . . . . . . . . . . . . . . . . . .4,5ComfortLink Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Navigator™ Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Conventions Used in this Manual . . . . . . . . . . . . . . . . 5System Pilot™ Interface. . . . . . . . . . . . . . . . . . . . . . . . . . 5CCN Tables and Display. . . . . . . . . . . . . . . . . . . . . . . . . . 5• GENERIC STATUS DISPLAY TABLESTART-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26Unit Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Accessory Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Crankcase Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Evaporator Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Gas Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6CONTROLS QUICK START . . . . . . . . . . . . . . . . . . . 27-29Variable Air Volume Units Using Return AirSensor or Space Temperature Sensor. . . . . . . . . 27Multi-Stage Constant Volume and Staged AirVolume Units with Mechanical Thermostat. . . . 27Multi-Stage Constant Volume and Staged AirVolume Units Units with Space Sensor . . . . . . . 27Economizer Configurations . . . . . . . . . . . . . . . . . . . . . 27Indoor Air Quality Configurations . . . . . . . . . . . . . . . 28Exhaust Configurations . . . . . . . . . . . . . . . . . . . . . . . . . 28Set Clock on VFD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Programming Operating Schedules . . . . . . . . . . . . . 29SERVICE TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-33General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Service Test Mode Logic . . . . . . . . . . . . . . . . . . . . . . . . 29Independent Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Humidi-MiZer ® System . . . . . . . . . . . . . . . . . . . . . . . . . . 32Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33SERVICE COMPONENT TESTS . . . . . . . . . . . . . . . 33-39THIRD PARTY CONTROL . . . . . . . . . . . . . . . . . . . . . 39-41Thermostat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Alarm Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Remote Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39VFD Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Supply Air Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Demand Limit Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Economizer/Outdoor Air Damper Control . . . . . . . 40CONTROLS OPERATION . . . . . . . . . . . . . . . . . . . . . 41-97Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41• SYSTEM MODES• HVAC MODESPageUnit Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44Cooling Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46• SETTING UP THE SYSTEM• MACHINE DEPENDENT CONFIGURATIONS• COOLING CONFIGURATION• COOL MODE SELECTION PROCESS• COOL MODE DIAGNOSTIC HELP• SUMZ COOLING ALGORITM• DEMAND LIMIT CONTROL• HEAD PRESSURE CONTROL• ECONOMIZER INTEGRATION WITHMECHANICAL COOLINGHeating Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61• POST FILTER APPLICATION• SETTING UP THE SYSTEM• HEAT MODE SELECTION PROCESS• TEMPERATURE DRIVEN HEAT MODEEVALUATION• HEAT MODE DIAGNOSTIC HELP• TWO-STAGE GAS AND ELECTRIC HEATCONTROL• HYDRONIC HEATING CONTROL• MODULATING GAS HEATING CONTROL• SCR ELECTRIC HEAT CONTROL• CONTROL BOARD INFORMATION• RELOCATE SAT FOR HEATING-LINKAGEAPPLICATIONS• TEMPERING MODEStatic Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . 69• SETTING UP THE SYSTEM• RELATED POINTS• STATIC PRESSURE RESETFan Status Monitoring. . . . . . . . . . . . . . . . . . . . . . . . . . . 72• GENERAL• SETTING UP THE SYSTEM• SUPPLY FAN STATUS MONITORING LOGICDirty Filter Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73• ECONOMIZER FAULT DETECTION AND DIAG-NOSTICS (FDD) CONTROL• DIFFERENTIAL DRY BULB CUTOFF CONTROL• ECONOMIZER SELF TEST• FDD CONFIGURATIONS• SETTING UP THE SYSTEM• ECONOMIZER OPERATION• ECONOMIZER CHANGEOVER SELECTION• UNOCCUPIED ECONOMIZER FREE COOLING• OUTDOOR AIR CFM CONTROL• ECONOMIZER OPERATION CONFIGURATIONS• ECONOMIZER DIAGNOSTIC HELPBuilding Pressure Control. . . . . . . . . . . . . . . . . . . . . . . 80• SETTING UP THE SYSTEMSmoke Control Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . 82• FIRE SMOKE INPUTSWeatherExpert ™48/50N2,N3,N4,N5,N6,N7,N8,N9Packaged Rooftop Cooling Units with Gas Heat, OptionalElectric Heat, or Hydronic Heat and ComfortLink ControlsVersion 2.x |
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