Carrier WeatherMaker 50A3 020-060 User Manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480077-01 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

Carrier WeatherMaker 50A3 020-060 Specifications

General

Brand	Carrier
Model	WeatherMaker 50A3 020-060
Category	Air Conditioner
Language	English

Summary

Controls, Start-Up, Operation, Service and Troubleshooting

SAFETY CONSIDERATIONS

Essential safety precautions and warnings for installing and servicing air-conditioning equipment.

GENERAL

Provides an overview of the manual's scope, conventions, and basic information about the unit.

BASIC CONTROL USAGE

Explains the functionality and flexibility of the ComfortLink control system for managing unit operations.

START-UP

Details the procedures for unit setup, including wiring, accessories, controls configuration, and gas heat checks.

CONTROLS QUICK START

Provides step-by-step guides for configuring various unit types and control options.

SERVICE TEST

Outlines procedures for testing cooling and heating operations using the unit's service test feature.

THIRD PARTY CONTROL

Explains how to integrate external devices like thermostats, IAQ sensors, and VFDs with the unit.

CONTROLS OPERATION

Details the operation of control modes, HVAC modes, and various configuration parameters.

Modes

Explains the system, HVAC, and control modes, including their hierarchical decision-making process.

Unit Configuration Submenu

Describes machine-dependent configurations that define unit type, fan mode, and sensor inputs.

Cooling Control

Provides details on setting up cooling modes, compressor staging, and temperature-dependent control logic.

Heating Control

Explains the different heating control types and configurations, including staged gas and electric heat.

Static Pressure Control

Details how ComfortLink controls manage VAV systems using VFDs and pressure sensors.

Fan Status Monitoring

Explains how to monitor fan status, including failure detection and configuration options.

Dirty Filter Switch

Information on the operation and configuration of the dirty filter switch accessory.

Economizer

Describes economizer control functions, including free cooling and configuration options.

Building Pressure Control

Explains the control strategies for managing building pressure using power exhaust and VFDs.

Smoke Control Modes

Details the four smoke control modes: Pressurization, Evacuation, Smoke Purge, and Fire Shutdown.

Indoor Air Quality (IAQ) Options

Describes IAQ functions, including Demand Controlled Ventilation (DCV) and economizer adjustments.

Dehumidification and Reheat

Explains how the unit controls dehumidification and reheat based on humidity and temperature sensors.

Temperature Compensated Start

Details the logic for delaying unit start-up to pre-condition the space based on temperature.

Carrier Comfort Network® (CCN) System

Information on configuring the unit for CCN communication and network settings.

Alert Limit Configuration

Configuration of set points for system alerts related to temperature, pressure, and IAQ.

Sensor Trim Configuration

Calibration procedures for various sensors to match actual measured readings.

Discrete Switch Logic Configuration

Configuration of normally open/closed status for switches and inputs.

Display Configuration

Options for configuring the local display settings, including units and language.

Remote Control Switch Input

Configuration of the remote switch input for controlling occupancy or start/stop functions.

Hot Gas Bypass

Information on the function and control of the hot gas bypass system for capacity staging.

Space Temperature Offset

Allows occupants to adjust space temperature set points via a slider on the T56 sensor.

TIME CLOCK CONFIGURATION

Procedure for programming local time schedules for unit operation, including holidays and daylight saving.

TROUBLESHOOTING

Guidance for diagnosing and resolving operational problems, including unit stoppages and alarms.

Complete Unit Stoppage

Identifies potential causes for complete unit shutdown and provides diagnostic steps.

Service Analysis

Detailed service analysis tables and diagrams for troubleshooting cooling and gas heating issues.

Alarms and Alerts

Lists and explains various alarm and alert codes, their probable causes, and recommended actions.

MAJOR SYSTEM COMPONENTS

Details the key electronic control system components and their functions.

Factory-Installed Components

Describes the main components like MBB, ECB1, ECB2, SCB, CEM, and IGC boards.

SERVICE

Provides instructions for performing maintenance tasks, including cleaning and component replacement.

Service Access

Guidance on safely accessing unit components for servicing, including door and latch procedures.

Main Burners

Instructions for inspecting and removing main burners, including spark gap adjustment.

Round Tube Plate Fin Coil Maintenance and Cleaning Recommendations

Procedures for cleaning coil surfaces to maintain unit performance and extend coil life.

Evaporator Fan Performance Adjustment

Steps for adjusting evaporator fan speed and alignment, including pulley and belt tension.

Refrigerant Charge

Information on determining and adjusting refrigerant charge based on unit specifications and charts.

Gas Valve Adjustment

Procedure for adjusting the natural gas valve to ensure proper fuel supply.