Carrier 48HC Series Service And Maintenance Instructions

48HC 3 to 12.5 Nominal Tons
Single Package Rooftop
Gas Heat/Electric Cooling Unit
with Puron (R---410A) Refrigerant
Sizes: 04–14
Service and Maintenance Instructions
TABLE OF CONTENTS
SAFETY CONSIDERATIONS
UNIT ARRANGEMENT AND ACCESS
RETURN AIR FILTERS . . . . . . . . . . . . . . . . . . . . . . . . .
SUPPLY FAN (BLOWER) SECTION
STAGED AIR VOLUME CONTROL - - 2 SPEED FAN
WITH VARIABLE FREQUENCY DRIVE (VFD)
ADDITIONAL VARIABLE FREQUENCY DRIVE
(VFD) INSTALLATION AND TROUBLESHOOTING. 9
MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COOLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THERMOSTATIC EXPANSION VALVE (TXV)
PURONR (R- - 410A) REFRIGERANT
COOLING CHARGING CHARTS
COMPRESSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONVENIENCE OUTLETS
SMOKE DETECTORS . . . . . . . . . . . . . . . . . . . . . . . . .
SENSOR AND CONTROLLER TESTS
PROTECTIVE DEVICES
GAS HEATING SYSTEM
PREMIERLINK CONTROL
RTU- - OPEN CONTROL SYSTEM
SENSORY/ACCESSORY INSTALLATION
ADDITIONAL RTU- - OPEN INSTALLATION AND
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . .
ECONOMIZER UNITS . . . . . . . . . . . . . . . . . . . . . . . .
PRE- - START- - UP/START- - UP
START- - UP, GENERAL . . . . . . . . . . . . . . . . . . . . . . . .
START- - UP, PREMIERLINK CONTROLS
START- - UP, RTU- - OPEN CONTROLS
FASTENER TORQUE VALUES
APPENDIX I. MODEL NUMBER SIGNIFICANCE
APPENDIX II. PHYSICAL DATA
APPENDIX III. FAN PERFORMANCE
APPENDIX IV WIRING DIAGRAMS
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APPENDIX V. MOTORMASTER SENSOR
LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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UNIT START-UP CHECKLIST
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SAFETY CONSIDERATIONS
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Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical
components. Only trained and qualified service personnel
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should install,
equipment. Untrained personnel can perform the basic
maintenance functions of replacing filters. Trained service
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personnel should perform all other operations.
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When working on air-conditioning equipment, observe
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precautions in the literature, tags and labels attached to
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the unit, and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work
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gloves. Use quenching cloth for unbrazing operations.
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Have fire extinguishers available for all brazing
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operations.
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Follow all safety codes. Wear safety glasses and work
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gloves. Use quenching cloth for brazing operations. Have
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fire extinguisher available. Read these instructions
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thoroughly and follow all warnings or cautions attached to
the unit. Consult local building codes and National
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Electrical Code (NEC) for special requirements.
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Recognize safety information. This is the safety ALERT
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symbol . When you see this symbol on the unit and in
instructions or manuals, be aware of the potential for
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physical injury hazards.
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Understand the signal words DANGER, WARNING, and
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CAUTION. These words are used with the safety- - ALERT
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symbol. DANGER indicates a hazardous situation which,
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if not avoided, will result in death or severe personal
injury. WARNING indicates a hazardous situation which,
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if not avoided, could result in death or personal injury.
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CAUTION indicates a hazardous situation which, if not
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avoided, could result in minor to moderate injury or
product and property damage. NOTICE is used to address
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practices not related to physical injury. NOTE is used to
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highlight suggestions which will result in enhanced
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installation, reliability, or operation.
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repair, or service air-conditioning
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