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Carrier WeatherExpert 48N2 - User Manual

Carrier WeatherExpert 48N2
248 pages
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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-1T
Controls, Start-Up, Operation,
Service and Troubleshooting
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . 2,3
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3,4
BASIC CONTROL USAGE . . . . . . . . . . . . . . . . . . . . . . .4,5
ComfortLink Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Navigator™ Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Conventions Used in this Manual . . . . . . . . . . . . . . . . 5
System Pilot™ Interface. . . . . . . . . . . . . . . . . . . . . . . . . . 5
CCN Tables and Display. . . . . . . . . . . . . . . . . . . . . . . . . . 5
• GENERIC STATUS DISPLAY TABLE
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26
Unit Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Accessory Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Crankcase Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Evaporator Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Gas Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CONTROLS QUICK START . . . . . . . . . . . . . . . . . . . 27-29
Variable Air Volume Units Using Return Air
Sensor or Space Temperature Sensor. . . . . . . . . 27
Multi-Stage Constant Volume and Staged Air
Volume Units with Mechanical Thermostat. . . . 27
Multi-Stage Constant Volume and Staged Air
Volume Units Units with Space Sensor . . . . . . . 27
Economizer Configurations . . . . . . . . . . . . . . . . . . . . . 27
Indoor Air Quality Configurations . . . . . . . . . . . . . . . 28
Exhaust Configurations . . . . . . . . . . . . . . . . . . . . . . . . . 28
Set Clock on VFD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Programming Operating Schedules . . . . . . . . . . . . . 29
SERVICE TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-33
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Service Test Mode Logic . . . . . . . . . . . . . . . . . . . . . . . . 29
Independent Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Humidi-MiZer
®
System . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
SERVICE COMPONENT TESTS . . . . . . . . . . . . . . . 33-39
THIRD PARTY CONTROL . . . . . . . . . . . . . . . . . . . . . 39-41
Thermostat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Alarm Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Remote Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
VFD Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Supply Air Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Demand Limit Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Economizer/Outdoor Air Damper Control . . . . . . . 40
CONTROLS OPERATION . . . . . . . . . . . . . . . . . . . . . 41-97
Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
• SYSTEM MODES
•HVAC MODES
Page
Unit Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Cooling 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 WITH
MECHANICAL COOLING
Heating Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
• POST FILTER APPLICATION
• SETTING UP THE SYSTEM
• HEAT MODE SELECTION PROCESS
• TEMPERATURE DRIVEN HEAT MODE
EVALUATION
• HEAT MODE DIAGNOSTIC HELP
• TWO-STAGE GAS AND ELECTRIC HEAT
CONTROL
• HYDRONIC HEATING CONTROL
• MODULATING GAS HEATING CONTROL
• SCR ELECTRIC HEAT CONTROL
• CONTROL BOARD INFORMATION
• RELOCATE SAT FOR HEATING-LINKAGE
APPLICATIONS
• TEMPERING MODE
Static Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . 69
• SETTING UP THE SYSTEM
• RELATED POINTS
• STATIC PRESSURE RESET
Fan Status Monitoring. . . . . . . . . . . . . . . . . . . . . . . . . . . 72
• GENERAL
• SETTING UP THE SYSTEM
• SUPPLY FAN STATUS MONITORING LOGIC
Dirty Filter Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 HELP
Building Pressure Control. . . . . . . . . . . . . . . . . . . . . . . 80
• SETTING UP THE SYSTEM
Smoke Control Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . 82
• FIRE SMOKE INPUTS
WeatherExpert
™
48/50N2,N3,N4,N5,N6,N7,N8,N9
Packaged Rooftop Cooling Units with Gas Heat, Optional
Electric Heat, or Hydronic Heat and ComfortLink Controls
Version 2.x

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Carrier WeatherExpert 48N2 Specifications

General IconGeneral
Product TypeAir Conditioner
SeriesWeatherExpert
Model Number48N2
Refrigerant TypeR-410A
Compressor TypeScroll
Phase1
Seasonal Energy Efficiency Ratio (SEER)16
Voltage208/230V

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