Carrier 48PG24 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 48PG24 Specifications

General

Model	48PG24
Refrigerant	R-410A
Voltage	208/230V
Phase	1
Compressor Type	Scroll
Type	Air Conditioner
Cooling Capacity	24, 000 BTU
Stages	Single Stage
HSPF	Not Applicable

Summary

Safety Considerations

General Safety Warnings

Highlights critical safety precautions for installation, service, and general operation of the unit.

Basic Control Usage

Explains the ComfortLink control system, its interface, and the Navigator display.

Start-Up Procedures

Unit Preparation and Checks

Covers essential pre-start-up checks including installation, electrical, and component integrity.

Compressor Rotation Verification

Emphasizes the importance of correct compressor rotation for proper operation and alarm prevention.

Gas Heat Start-Up (48PG Only)

Provides detailed instructions for verifying gas pressures before initiating gas heat operation.

Controls Quick Start Guide

Thermostat and Space Sensor Setup

Guides on wiring and configuring thermostat, CCN, and space sensors for temperature control.

Service Test Function Overview

Introduces the Service Test function for verifying proper operation of unit components.

Troubleshooting and Service Analysis

Indoor Air Quality (IAQ) Controls

Details IAQ sensor capabilities, configurations, and damper modulation for ventilation.

Occupancy Determination Logic

Cooling and Heating Control Modes

Describes unit operation in Thermostat and Space Sensor modes, including staging.

Alarm Codes and Diagnostics

Lists alarm codes, their actions, reset methods, and probable causes for system troubleshooting.

Cooling Service Analysis

Provides analysis and remedies for common cooling system problems.

Humidi-MiZer™ Service Analysis

Economizer Service Analysis

Gas Heating Service Analysis

IGC Board LED Alarm Codes

Electric Heat Service Analysis

Appendix A: Local Display and CCN Tables

Mode - Run Status Parameters

Mode - Set Points

Mode - Inputs

Mode - Outputs

Mode - Configuration Parameters

Provides a comprehensive list of configuration parameters and their settings.

Mode - Alarms

Unit Start-Up Checklist

Pre-Start-Up Verification

Checklist items to verify before initial unit start-up, including packing removal and connections.

Start-Up Electrical Checks

Electrical checks required during start-up, including voltage and amperage verification.

Start-Up Temperature and Pressure Verification

Temperature and pressure readings to verify during unit start-up.

General Start-Up Requirements