50TCQD17---D24
Single Package Heat Pump/Electric Heat
Nominal15to20Tons
With Puron
(R---410A) Refrigerant
Service and Maintenance Instructions
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 1....................
UNIT ARRANGEMENT AND ACCESS 3...........
SUPPLY FAN (BLOWER) SECTION 4..............
HEAT PUMP REFRIGERATION SYSTEM 6.........
THERMOSTATIC EXPANSION VALVE (TXV) 11....
PURONR (R--410A) REFRIGERANT 13.............
COOLING CHARGING CHARTS 14................
CONVENIENCE OUTLETS 18....................
HEAT PUMP CONTROLS 19......................
PROTECTIVE CONTROLS 20.....................
COMMERCIAL DEFROST CONTROL 20...........
ELECTRIC HEATERS 23.........................
SMOKE DETECTORS 26.........................
PREMIERLINK CONTROL 34...................
RTU--OPEN CONTROL SYSTEM 35................
SENSORY/ACCESSORY INSTALLATION 35........
ADDITIONAL RTU--OPEN INSTALLATION AND
TROUBLESHOOTING 35.........................
PRE--START--UP 37..............................
START--UP 37..................................
START--UP, GENERAL 37........................
START--UP, PREMIERLINK 39...................
START--UP, RTU--OPEN 39........................
FASTENER TORQUE VALUES 39.................
APPENDIX I. MODEL NUMBER SIGNIFICANCE 40.
APPENDIX II. PHYSICAL DATA 41................
APPENDIX IV. WIRING DIAGRAMS 45............
APPENDIX V. FAN PERFORMANCE 53............
APPENDIX VI. MOTORMASTER SENSOR LOCA-
TIONS 57......................................
START-UP CHECKLIST 59.......................
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioni ng equipment
can be hazardous due to system pressure and electrical
compone nts. Only trained and qualified se rvice personnel
should install, repair, or service air-conditioning
equipment. Untrained personnel can perform only the
basic maintenance functions such as replacing filters.
Trained service personnel should perform all other service
and maintenance 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 approved safety glasses and
lea ther work gloves. Use quenching cloth for unbrazing
operat ions. Have fire extinguishers available for all
brazing operations.
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 thi s symbol on the unit and in
instructions or manuals, be aware of the potentia l 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 property 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.
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