Carrier WeatherExpert 48N2 User Manual

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

Carrier WeatherExpert 48N2 Specifications

General

Brand	Carrier
Model	WeatherExpert 48N2
Category	Air Conditioner
Language	English