Carrier 50PG24 User Manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480028-01 Printed in U.S.A. Form 48/50PG-5T Pg 1 6-06 Replaces: 48/50PG-2T
Book 1 1
Ta b 1 a 1 b
Controls, Start-Up, Operation, Service and
Troubleshooting Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
BASIC CONTROL USAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
ComfortLink™ Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Scrolling Marquee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Accessory Navigator™ Display . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
System Pilot™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
CCN Tables and Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Conventions Used in this Manual . . . . . . . . . . . . . . . . . . . . . . . . . .4
START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-35
Unit Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Compressor Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Refrigerant Service Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Crankcase Heater(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Subcooler Heat Exchanger (SHX) . . . . . . . . . . . . . . . . . . . . . . . . . .6
Evaporator Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Condenser Fans and Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Outdoor-Air Inlet Screens. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Gas Heat (48PG Only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Orifice Change (48PG Only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Air Baffles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Accessory Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
CONTROLS QUICK START. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35,36
Thermostat Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Space Temperature Sensor Control —
Direct Wired (T-55 or T-56) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Space Temperature Sensor Control — CCN (T-58). . . . . . . . .35
Space Temperature Sensor Control — CCN Linkage . . . . . .35
Space Humidity Control — Humidistat . . . . . . . . . . . . . . . . . . . .35
Space Humidity Control — Thermidistat™ . . . . . . . . . . . . . . . .35
Space Humidity Control — Relative Humidity Sensor . . . . .35
CCN Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Service Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Control Configuration Checklist . . . . . . . . . . . . . . . . . . . . . . . . . .36
Programming Operating Schedules. . . . . . . . . . . . . . . . . . . . . . .36
SERVICE TEST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36-38
THIRD PARTY CONTROL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38,39
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Humidistat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Humidity Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Remote Occupancy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Fire Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Alarm Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Outdoor Enthalpy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
IAQ Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
IAQ Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
OAQ Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
CONTROLS OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39-52
Display Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Unit Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Occupancy Determination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Indoor Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
• THERMOSTAT CONTROL
Page
• SPACE SENSOR CONTROL
• OUTDOOR FANS
Gas Heating (48PG Units) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
• THERMOSTAT CONTROL
• SPACE SENSOR CONTROL
• SUPPLY AIR TEMPERATURE (SAT) SENSOR
Electric Heat (50PG Units). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
• THERMOSTAT CONTROL
• SPACE SENSOR CONTROL
• SUPPLY AIR TEMPERATURE (SAT) SENSOR
Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
• THERMOSTAT CONTROL
• SPACE SENSOR CONTROL
• ECONOMIZER ACTUATOR COMMUNICATIONS
• UNOCCUPIED FREE COOLING
• POWER EXHAUST
Optional Humdi-MiZer Dehumidification System . . . . . . . . . 45
• SETTING UP THE SYSTEM
• REHEAT MODE SELECTION PROCESS
• REHEAT MODE DIAGNOSTIC HELP
• AIR BAFFLES
Indoor Air Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Temperature Compensated Start . . . . . . . . . . . . . . . . . . . . . . . . . 51
Carrier Comfort Network® (CCN) Configuration . . . . . . . . . . 51
Alarm Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52-67
Complete Unit Stoppage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Restart Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Control Module Communication. . . . . . . . . . . . . . . . . . . . . . . . . . 54
Alarms and Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
• VIEWING AND CLEARING UNIT ALARMS
• DIAGNOSTIC ALARM CODES AND POSSIBLE CAUSES
Cooling Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Humidi-MiZer Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Economizer Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Heating Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Phase Loss Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Thermistor Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Transducer Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Forcing Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
MAJOR SYSTEM COMPONENTS . . . . . . . . . . . . . . . . . . . . . . 67-84
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Main Base Board (MBB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Economizer Control Board (ECB) . . . . . . . . . . . . . . . . . . . . . . . . 67
Integrated Gas Control (IGC) Board . . . . . . . . . . . . . . . . . . . . . . 67
Low Voltage Terminal Strip (TB2). . . . . . . . . . . . . . . . . . . . . . . . . 67
Scrolling Marquee Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Accessory Navigator™ Display. . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Carrier Comfort Network® Interface . . . . . . . . . . . . . . . . . . . . . . 80
Subcooler Heat Exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Field-Installed Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
• SPACE TEMPERATURE SENSOR (T-55)
• SPACE TEMPERATURE SENSOR (T-56)
• SPACE TEMPERATURE SENSOR (T-58)
• SPACE TEMPERATURE SENSOR AVERAGING
•ECONOMIZER
• POWER EXHAUST
• TWO-POSITION DAMPER
• INDOOR AIR QUALITY
• OUTDOOR AIR QUALITY
• SMOKE DETECTORS
• FILTER STATUS
• FAN STATUS
48/50PG20-28
Single Package Rooftop Units
with COMFORTLINK™ Controls
and PURON® (R-410A) Refrigerant

Carrier 50PG24 Specifications

General

Model	50PG24
Phase	1
Cooling Capacity	24, 000 BTU
Voltage	208/230V
Heating Capacity	24, 000 BTU
Power Supply	208/230V, 1 Phase, 60 Hz
Outdoor Unit Dimensions (H x W x D)	31.5"

Summary

Safety Considerations

General Safety Precautions

Essential safety instructions for installation, service, and maintenance procedures.

Basic Control Usage

ComfortLink™ Control System Overview

Describes the ComfortLink control system as a comprehensive unit-management system.

Scrolling Marquee & Navigator Displays

Details keypad interface for control access and the handheld Navigator display.

System Pilot & CCN Integration

Describes System Pilot device and CCN table access for unit information.

Start-Up Procedures

Unit Preparation and Checks

Details checks required before unit start-up, following installation instructions and codes.

Compressor Rotation and Gas Heat Checks

Emphasizes correct compressor rotation and gas heat pressure checks.

Control Configuration and Operation

Controls Quick Start Guide

Provides a quick guide to setting up and configuring the unit controls.

Occupancy Determination and IAQ Control

Explains how occupancy is determined and details Indoor Air Quality (IAQ) control features.

Service and Troubleshooting

Service Test Procedures

Explains how to use Service Test mode for component verification and diagnostics.

Troubleshooting Common Issues

Covers unit stoppage causes, alarm handling, and diagnostic alarm codes.

Major System Components

Describes key control boards like MBB, ECB, and IGC, and terminal strips.

Maintenance Procedures

Coil Cleaning and Lubrication

Provides instructions for cleaning coil surfaces and compressor lubrication.

Fan Service and Adjustment

Details evaporator fan service, replacement, and condenser fan adjustment.

Verify Sensor Performance

Guides on verifying thermistor, transducer, and switch inputs using the Scrolling Marquee display.

Unit Start-Up Checklist

Pre-Start-Up Verification Steps

Lists all checks to perform before initiating unit start-up, covering physical installation and electrical connections.

Start-Up Electrical Data Recording

Provides fields for recording electrical supply voltages and compressor/fan amp readings.