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Carrier 48HC*04–14 User Manual

Carrier 48HC*04–14
130 pages
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48HC*04–14
Nominal 3 to 12.5 Tons
With Puron ( R 410A) R efrig er ant
Service and Maintenance Instructions
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 1....................
UNIT ARRANGEMENT AND ACCESS 3...........
RETURN AIR FILTERS 4.........................
SUPPLY FAN (BLOWER) SECTION 4..............
STAGED AIR VOLUME CONTROL --2 SPEED FAN
WITH VARIABLE FREQUENCY DRIVE (VFD) 8....
ADDITIONAL VARIABLE FREQUENCY DRIVE
(VFD) INSTALLATION AND TROUBLESHOOTING. 9
MOTOR 9......................................
COOLING 13...................................
THERMOSTATIC EXPANSION VALVE (TXV) 15....
PURONR (R--410A) RE FRIGERANT 16.............
COOLING CHARGING CHARTS 18................
COMPRESSOR 22...............................
CONVENIENCE OUTLETS 25....................
SMOKE DETECTORS 26.........................
SENSOR AND CONTROLLER TESTS 30...........
PROTECTIVE DEVICES 33.......................
GAS HEATING SYSTEM 34......................
PREMIERLINK CONTROL 49...................
RTU--OPEN CONTROL SYSTEM 49................
SENSORY/ACCESSORY INSTALLATION 49........
ADDITIONAL RTU--OPEN INSTALLATION AND
TROUBLESHOOTING 50.........................
ECONOMIZER UNITS 52........................
PRE-- START-- UP/START--UP 61....................
START--UP, GENERAL 61........................
START--UP, PREMIERLINK CONTROLS 63.......
START--UP, RTU--OPEN CONTROLS 64............
FASTENER TORQUE VALUES 64.................
APPENDIX I. MODEL NUMBER SIGNIFICANCE 65.
APPENDIX II. PHYSICAL DAT A 66................
APPENDIX III. FAN PERFORMANCE 71...........
APPENDIX IV WIRING DIAGRAMS 89............
APPENDIX V. MOTORMASTER SENSOR
LOCATIONS 126................................
UNIT START-UP CHECKLIST 129.................
SAFETY CONSIDERAT I ONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical
compone nts. Only trained and qualified service personnel
should install, repair, or service air-conditioning
equipment. Untrained personnel can perform the basic
maintenance functions of replacing filters. Trained service
personnel should perform all other operations.
When working on air-conditioning equipm ent, observe
precautions in the literature, tags and labels attached to
the unit, and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations.
Have fire extinguishers available for all brazing
operations.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for brazing operations. Ha ve
fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions attached to
the unit. Consult local building codes and National
Electrical Code (NEC) for special requirements.
Recognize safety information. This is the safety ALERT
symbol
. When you see this symbol on the unit and in
instructions or manuals, be aware of the potential for
physical injury hazards.
Understand the signal words DANGER, WARNING,and
CAUTION. These words are used with the safety--ALERT
symbol. DANGER indicates a hazardous situation which,
if not avoided, will result in death or severe personal
injury. WARNING indicates a hazardous situation which,
if not avoided, could result in death or personal injury.
CAUTION indicates a hazardous situation which, if not
avoide d, could result in minor to moderate injury or
product and propert y damage. NOTICE is used to address
practices not related to physical injury. NOTE is used to
highlight suggestions which will result in enhanced
installation, reliability, or operation.

Table of Contents

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Carrier 48HC*04–14 Specifications

General IconGeneral
BrandCarrier
Model48HC*04–14
CategoryAir Conditioner
LanguageEnglish

Summary

Safety Considerations

Supply Fan (Blower) Section

Supply Fan (Direct-Drive)

Information on direct-drive forward-curved centrifugal blower wheel options.

ECM Motor

Explanation of the X13 Electronically Commutated Motor and its components.

Troubleshooting the ECM Motor

Steps for troubleshooting the X13 ECM motor using a voltmeter.

Replacing the X-13 ECM Motor

Detailed procedure for removing and replacing the ECM motor assembly.

Staged Air Volume Control with VFD

SAV Indoor Fan Speed System

How the SAV system adjusts fan speed for cooling, heating, and ventilation.

Additional VFD Installation and Troubleshooting

Motor Replacement

Steps for replacing the belt-driven motor assembly.

Cooling System Maintenance

Condenser Coil Maintenance and Cleaning

Recommendations for cleaning condenser coils to ensure optimal operation and longevity.

Evaporator Coil Cleaning

Steps for cleaning the evaporator coil, including access and material usage.

Thermostatic Expansion Valve (TXV)

TXV Operation

How the TXV adjusts refrigerant flow based on superheat and suction pressure.

Replacing TXV

Step-by-step procedure for removing and installing a new TXV.

Puron® (R-410A) Refrigerant

Refrigerant Charge

Information on determining refrigerant charge amount and procedures.

Cooling Charging Charts

Compressor

Compressor Rotation

How to determine and ensure correct compressor rotation direction.

Replacing Compressor

Procedures for removing and replacing compressor units, noting factory-trained technicians.

Troubleshooting Cooling System

Referencing troubleshooting topics for the cooling system.

Smoke Detectors

Completing Return Air Smoke Detector Installation

Step-by-step guide to install the return air smoke detector sensor and plate.

FIOP Smoke Detector Wiring and Response

PremierLink™ and RTU-OPEN Controls

How smoke detector signals interact with PremierLink and RTU-OPEN.

Sensor and Controller Tests

Sensor Alarm Test

Checks sensor's ability to signal an alarm state using a test magnet.

Controller Alarm Test

Checks controller's ability to initiate and indicate an alarm state.

Dirty Controller Test

Checks controller's ability to indicate a dirty sensor test result.

Protective Devices

Compressor Protection

Overcurrent, over-temperature, high pressure, and low pressure protection features.

Gas Heating System

PremierLink™ Control

RTU-OPEN Control System

Overview of the RTU-Open controller as an integrated component.

Additional RTU-OPEN Installation and Troubleshooting

References for further RTU-OPEN installation and troubleshooting information.

Economizer Systems

EconoMi$er IV Standard Sensors

Pre-Start-Up and Start-Up

Unit Preparation

Ensuring unit installation compliance and following start-up sequences.

Start-Up: PremierLink™ Controls

Start-Up: RTU-OPEN Controls

Appendix III: Fan Performance

Unit Start-Up Checklist

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