Carrier 50TCQ 14 Series Service And Maintenance Instructions

50TCQ*04-14
Single Package Heat Pump/Electric Heat
Nominal 3 to 12.5 Tons
With Puron (R-410A) Refrigerant
Service and Maintenance Instructions

TABLE OF CONTENTS

SAFETY CONSIDERATIONS
UNIT ARRANGEMENT AND ACCESS
RETURN AIR FILTERS: . . . . . . . . . . . . . . . . . . . . . . . .
SUPPLY FAN (BLOWER) SECTION
HEAT PUMP REFRIGERATION SYSTEM
PURONR (R−410A) REFRIGERANT
THERMOSTATIC EXPANSION VALVE (TXV)
COOLING CHARGING CHARTS
CONVENIENCE OUTLETS
HEAT PUMP CONTROLS
PROTECTIVE CONTROLS
COMMERCIAL DEFROST CONTROL
ELECTRIC HEATERS . . . . . . . . . . . . . . . . . . . . . . . . .
SMOKE DETECTORS . . . . . . . . . . . . . . . . . . . . . . . . .
PREMIERLINK™ CONTROL
RTU−OPEN CONTROL SYSTEM
SENSORY/ACCESSORY INSTALLATION
ADDITIONAL RTU−OPEN INSTALLATION AND
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . .
PRE−START−UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
START−UP, PREMIERLINK™
START−UP, RTU−OPEN . . . . . . . . . . . . . . . . . . . . . . . .
FASTENER TORQUE VALUES
APPENDIX I. MODEL NUMBER SIGNIFICANCE
APPENDIX II. PHYSICAL DATA
APPENDIX III. FAN PERFORMANCE
APPENDIX IV. WIRING DIAGRAMS
APPENDIX V. MOTORMASTER SENSOR
LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . .
. . . . . . . . . . . . . .
. . . . . . . . .
. . . . . . . . . . . . .
. . . .
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . .
. . . . . . . .
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . .
.
. . . . . . . . . . . . . . . .
. . . . . . . . . . .
. . . . . . . . . . . .

SAFETY CONSIDERATIONS

1
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical
3
components. Only trained and qualified service personnel
3
should install,
4 equipment. Untrained personnel can perform only the
basic maintenance functions such as replacing filters.
9
Trained service personnel should perform all other service
12
and maintenance operations.
13
When working on air-conditioning equipment, observe
15
precautions in the literature, tags and labels attached to
the unit, and other safety precautions that can apply.
23
Follow all safety codes. Wear approved safety glasses and
24
leather work gloves. Use quenching cloth for unbrazing
24
operations. Have fire extinguishers available for all
brazing operations.
25
Read these instructions thoroughly and follow all
28
warnings or cautions attached to the unit. Consult local
31
building codes and National Electrical Code (NEC) for
38
special requirements.
39
Recognize safety information. This is the safety ALERT
39
symbol . When you see this symbol on the unit and in
instructions or manuals, be aware of the potential for
physical injury hazards.
39
41
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety−ALERT
43
symbol. DANGER indicates a hazardous situation which,
43
if not avoided, will result in death or severe personal
44
injury. WARNING indicates a hazardous situation which,
if not avoided, could result in death or personal injury.
45
CAUTION indicates a hazardous situation which, if not
47
avoided, could result in minor to moderate injury or
product and property damage. NOTICE is used to address
49
practices not related to physical injury. NOTE is used to
62
highlight suggestions which will result in enhanced
installation, reliability, or operation.
79
83
repair, or service air-conditioning