Service and Maintenance Instructions
48HC*D17–D28
Nominal15to25Tons
with Puron (R---410A) Refrigerant
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 1....................
UNIT ARRANGEMENT AND ACCESS 3...........
SUPPLY FAN (BLOWER) SECTION 4..............
STAGED AIR VOLUME (SAV) CONTROL: 2--SPEED
FAN WITH VARIABLE FREQUENCY DRIVE (VFD) 6...
ADDITIONAL VFD INSTALLATION AND
TROUBLESHOOTING 7..........................
MOTOR 7......................................
CONDENSER COIL SERVICE 9...................
EVAPORATOR COILS 10.........................
HUMIDI--MIZER ADAPTIVE DEHUMIDIFICATION
SYSTEM 12....................................
THERMOSTATIC EXPANSION VALVE (TXV) 18....
PURONR (R--410A) REFRIGERANT 20.............
COOLING CHARGING CHARTS 22................
COMPRESSORS 26..............................
CONVENIENCE OUTLETS 29....................
SMOKE DETECTORS 30.........................
INDICATORS 36................................
PROTECTIVE DEVICES 37.......................
PREMIERLINKt CONTROL 39...................
RTU--OPEN CONTROL SYSTEM 40................
SENSORY/ACCESSORY INSTALLATION 40........
GAS HEATING SYSTEM 42......................
ECONOMI$ER SYSTEMS 53......................
PRE--START--UP 62..............................
START--UP, GENERAL 62........................
START--UP, PREMIERLINK CONTROLS 64.........
START--UP, RTU--OPEN CONTROL 65..............
FASTENER TORQUE VALUES 65.................
APPENDIX I. MODEL NUMBER SIGNIFICANCE 66.
APPENDIX II. PHYSICAL DATA 67................
APPENDIX III. FAN PERFORMANCE 70...........
APPENDIX IV. WIRING DIAGRAMS 75............
APPENDIX V. MOTORMASTER SENSOR
LOCATIONS 88.................................
UNIT START-UP CHECKLIST 89..................
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical
components. 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 equipment, observe
precautions in the literature, tags and labels attached to
the unit, and other safety precautions that can 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. Have
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
avoided, could result in minor to moderate injury or
product and property damage. NOTICE is used to address
practices not related to physical injury. NOTE is used to
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