United Technologies Carrier Weathermaker 48A2 User Manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480166-01 Printed in U.S.A. Form 48/50A-13T Pg 1 2-18 Replaces: 48/50A-12T
Controls, Start-Up, Operation,
Service and Troubleshooting
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . .2
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Conventions Used in this Manual. . . . . . . . . . . . . . . . . . . .3
BASIC CONTROL USAGE . . . . . . . . . . . . . . . . . . . . . . . . . . .4
ComfortLink Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Scrolling Marquee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Accessory Navigator™ Display. . . . . . . . . . . . . . . . . . . . . .4
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
System Pilot™ Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
CCN Tables and Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
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 . . . . . . . . . . . . . . . . . . . . . . . . .21
Variable Air Volume Units Using Return Air Sensor
or Space Temperature Sensor. . . . . . . . . . . . . . . . . . . .21
Multi-Stage Constant Volume Units with
Mechanical Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . .21
Multi-Stage Constant Volume Units with
Space Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Economizer Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Indoor Air Quality Options. . . . . . . . . . . . . . . . . . . . . . . . . .22
Exhaust Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Programming Operating Schedules . . . . . . . . . . . . . . . .22
SERVICE TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Service Test Mode Logic . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Independent Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Fans in Service Test Mode . . . . . . . . . . . . . . . . . . . . . . . . .23
Cooling in Service Test Mode . . . . . . . . . . . . . . . . . . . . . .23
Heating in Service Test Mode. . . . . . . . . . . . . . . . . . . . . . .23
Humidi-MiZer
®
System . . . . . . . . . . . . . . . . . . . . . . . . . . 23
THIRD PARTY CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Alarm Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Remote Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
VFD Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Supply Air Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Demand Limit Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Demand Controlled Ventilation Control. . . . . . . . . . . . .26
CONTROLS OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
• SYSTEM MODES
• HVAC MODES
Unit Configuration Submenu . . . . . . . . . . . . . . . . . . . . . . .30
Cooling Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
• SETTING UP THE SYSTEM
• MACHINE DEPENDENT CONFIGURATIONS
•SETPOINTS
• SUPPLY AIR RESET CONFIGURATION
• COOLING CONFIGURATION
Page
• 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
• 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 APPLICATIONS
• MORNING WARM UP
• TEMPERING MODE
Static Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
•OPERATION
• SETTING UP THE SYSTEM
• STATIC PRESSURE RESET OPERATION
• RELATED POINTS
Fan Status Monitoring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
• GENERAL
• SETTING UP THE SYSTEM
• SUPPLY FAN STATUS MONITORING LOGIC
Dirty Filter Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
• ECONOMIZER FAULT DETECTION AND
DIAGNOSTICS (FDD) CONTROL
• DIFFERENTIAL DRY BULB CUTOFF CONTROL
• SETTING UP THE SYSTEM
• ECONOMIZER OPERATION
• UNOCCUPIED ECONOMIZER FREE COOLING
• FDD CONFIGURATIONS
• ECONOMIZER OPERATION CONFIGURATION
• ECONOMIZER DIAGNOSTIC HELP
Building Pressure Control. . . . . . . . . . . . . . . . . . . . . . . . . . 62
• 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
• FIRE-SMOKE INPUTS
• AIRFLOW CONTROL DURING THE
FIRE-SMOKE MODES
• RELEVANT ITEMS
Indoor Air Quality Control . . . . . . . . . . . . . . . . . . . . . . . . . . 65
•OPERATION
• SETTING UP THE SYSTEM
• PRE-OCCUPANCY PURGE
Weathermaker
®
48/50A2,A3,A4,A5020-060
Single Package Large Rooftop Units
with ComfortLink Version 8.x Controls

United Technologies Carrier Weathermaker 48A2 Specifications

General

Brand	United Technologies
Model	Carrier Weathermaker 48A2
Category	Air Conditioner
Language	English