Carrier 48/50AJ Air Conditioner User Manual


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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. 04-53480077-01 Printed in U.S.A. Form 48/50A-9T Pg 1 6-10 Replaces: 48/50A-7T
Controls, Start-Up, Operation,
Service and Troubleshooting
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . .2
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Conventions Used in this Manual. . . . . . . . . . . . . . . . . . . .3
BASIC CONTROL USAGE. . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
ComfortLink Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Scrolling Marquee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Accessory Navigator™ Display. . . . . . . . . . . . . . . . . . . . . .4
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
System Pilot™ Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
CCN Tables and Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
• GENERICS STATUS DISPLAY TABLE
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-27
Unit Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Unit Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Internal Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Accessory Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Crankcase Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Evaporator Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Gas Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
CONTROLS QUICK START . . . . . . . . . . . . . . . . . . . . . . 27-29
Two-Stage Constant Volume Units with
Mechanical Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . .27
Two-Stage Constant Volume Units with
Space Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Variable Air Volume Units Using Return Air Sensor
or Space Temperature Sensor. . . . . . . . . . . . . . . . . . . .28
Multi-Stage Constant Volume Units with
Mechanical Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . .28
Multi-Stage Constant Volume Units with
Space Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Economizer Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Indoor Air Quality Options. . . . . . . . . . . . . . . . . . . . . . . . . .29
Exhaust Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Programming Operating Schedules . . . . . . . . . . . . . . . .29
SERVICE TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29,30
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Service Test Mode Logic . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Independent Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Fans in Service Test Mode . . . . . . . . . . . . . . . . . . . . . . . . .30
Cooling in Service Test Mode. . . . . . . . . . . . . . . . . . . . . . .30
Heating in Service Test Mode. . . . . . . . . . . . . . . . . . . . . . .30
THIRD PARTY CONTROL . . . . . . . . . . . . . . . . . . . . . . . . 31,32
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Alarm Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Remote Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
VFD Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Supply Air Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Demand Limit Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Demand Controlled Ventilation Control. . . . . . . . . . . . .31
CONTROLS OPERATION . . . . . . . . . . . . . . . . . . . . . . . . 32-75
Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
• SYSTEM MODES
• HVAC MODES
Page
Unit Configuration Submenu . . . . . . . . . . . . . . . . . . . . . . . 35
Cooling Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
• SETTING UP THE SYSTEM
• MACHINE DEPENDENT CONFIGURATIONS
• SET POINTS
• SUPPLY AIR RESET CONFIGURATION
• COOLING CONFIGURATION
• COMPRESSOR SAFETIES
• COMPRESSOR TIME GUARDS
• COOL MODE SELECTION PROCESS
• COOLING MODE DIAGNOSTIC HELP
• SUMZ COOLING ALGORITHM
• DEMAND LIMIT CONTROL
• HEAD PRESSURE CONTROL
• ECONOMIZER INTEGRATION WITH
MECHANICAL COOLING
Heating Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
• SETTING UP THE SYSTEM
• HEAT MODE SELECTION PROCESS
• TEMPERATURE DRIVEN HEAT MODE
EVALUATION
• HEAT MODE DIAGNOSTIC HELP
• INTEGRATED GAS CONTROL BOARD LOGIC
• RELOCATE SAT SENSOR FOR HEATING IN
LINKAGE SYSTEMS
• MORNING WARM UP
• TEMPERING MODE
Static Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
•OPERATION
• SETTING UP THE SYSTEM
• STATIC PRESSURE RESET OPERATION
• RELATED POINTS
Fan Status Monitoring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
• GENERAL
• SETTING UP THE SYSTEM
• SUPPLY FAN STATUS MONITORING LOGIC
Dirty Filter Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
• SETTING UP THE SYSTEM
• ECONOMIZER OPERATION
• UNOCCUPIED ECONOMIZER FREE COOLING
• ECONOMIZER OPERATION CONFIGURATION
• ECONOMIZER DIAGNOSTIC HELP
Building Pressure Control. . . . . . . . . . . . . . . . . . . . . . . . . . 63
• BUILDING PRESSURE CONFIGURATION
• CONSTANT VOLUME 2-STAGE CONTROL
OPERATION
• MULTIPLE POWER EXHAUST STAGE BUILDING
PRESSURE CONTROL OPERATION
• VFD POWER EXHAUST BUILDING PRESSURE
CONTROL
Smoke Control Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
• FIRE-SMOKE INPUTS
• AIRFLOW CONTROL DURING THE
FIRE-SMOKE MODES
• RELEVANT ITEMS
WEATHERMAKER
®
48/50AJ,AK,AW,AY,A2,A3,A4,A5020-060
Single Package Large Rooftop Units
with COMFORTLINK™ Version 5.x Controls
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