Carrier 48/50AJ specifications Contents, Two-StageConstant Volume Units with

WEATHERMAKER® 48/50AJ,AK,AW,AY,A2,A3,A4,A5020-060 Single Package Large Rooftop Units with COMFORTLINK™ Version 5.x Controls

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

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