Carrier WeatherMaker 50AK 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 50AK 020-060 Specifications

General

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

Summary

SAFETY CONSIDERATIONS

GENERAL

Conventions Used in This Manual

Explains symbols, path names, and conventions for discussing configuration points in the local display.

BASIC CONTROL USAGE

Overview of the ComfortLink control system, its flexibility, and managed functions like VAV duct pressure and building pressure.

START-UP

Unit Preparation and Setup

Checks for proper installation, economizer hood installation, outdoor filters, and electrical connections.

Internal Wiring

Ensures electrical connections in the control box are tightened and sensors are properly routed.

Accessory Installation

Checks installation and wiring of accessories like space thermostats and sensors.

Crankcase Heaters

Details on crankcase heaters being energized as long as power is supplied, except when compressors are running.

Evaporator Fan

Instructions for checking fan belt, pulleys, direction, and removing tape from pulley.

Controls

Steps for setting control configurations, entering set points, configuring occupancy schedule, and verifying component operation.

Gas Heat Start-Up

Procedure for verifying gas pressure and operation using service test.

CONTROLS QUICK START

SERVICE TEST

General and Mode Logic

Overview of the Service Test feature for forcing unit modes and mode selection logic.

Testing Specific Components

Details on testing Independent Outputs, Fans, Cooling, and Heating modes.

THIRD PARTY CONTROL

Thermostat

Describes thermostat input methods for control: Y1, Y2, W1, W2, G, and alarm output.

VFD Control

Explains controlling the supply fan VFD with a 4 to 20 mA signal or via CCN.

Demand Limit Control

Details on restricting mechanical cooling capacity using discrete inputs or a 4 to 20 mA signal.

Demand Controlled Ventilation Control

Explains IAQ discrete input configuration for controlling economizer and fan based on CO2 levels.

CONTROLS OPERATION

Modes

Describes the hierarchy of system, HVAC, and control modes, including their definitions and functions.

Unit Configuration Submenu

Details on configuring unit parameters like machine control type, fan mode, and economizer settings.

Cooling Control

Explains cooling control approaches, compressor staging, and VAV/thermostat modes.

Heating Control

Describes heating control types, staged gas configurations, and heat mode evaluation.

Static Pressure Control

Details on VAV static pressure control using VFD, sensor inputs, and reset configurations.

Fan Status Monitoring

Explains how to monitor fan status, detect failures, and configure related parameters.

Economizer

Information on economizer control, free cooling, changeover select, and related configuration options.

Building Pressure Control

Details on power exhaust control configurations and PID settings for building pressure.

Indoor Air Quality (IAQ) Options

Dehumidification and Reheat

Temperature Compensated Start

Carrier Comfort Network® (CCN) System

Alert Limit Configuration

Sensor Trim Configuration

Troubleshooting

MAJOR SYSTEM COMPONENTS

General

Overview of the ComfortLink system components including MBB, ECB, SCB, CEM, and CS.

Factory-Installed Components

Details on the Main Base Board (MBB), Economizer Board (ECB1), VAV Board (ECB2), and Staged Gas Heat Board (SCB).

SERVICE

Service Access and Cleaning

Procedures for accessing unit components and performing routine cleaning.

Main Burners and Flue Gas Passageways

Inspection and cleaning instructions for main burners and flue gas passageways.

Combustion-Air Blower

Guidance on inspecting and cleaning the combustion-air blower wheel for proper airflow and heating.

Round Tube Plate Fin Coil Maintenance

Recommendations for routine cleaning of coil surfaces to maintain performance and extend unit life.

Evaporator Fan Service

Procedures for evaporator fan performance adjustment, coupling assembly, and motor replacement.

Condenser-Fan Adjustment

Instructions for adjusting condenser fan height on the shaft to maintain acceptable head pressure.

Refrigerant Charge and Low Charge Cooling

Information on refrigerant charge amounts and procedures for low charge cooling using charts.

Gas Valve Adjustment

Steps for adjusting the natural gas valve for proper operation and pressure.