Carrier 38MPRAQ18AA3 Service Manual

38MPRA
Outdoor Unit Single Zone Ductless System
Sizes 09 to 24

TABLE OF CONTENTS

SAFETY CONSIDERATIONS ....................................................... 1
INTRODUCTION............................................................................ 1
MODEL NUMBER NOMENCLATURE ....................................... 2
SPECIFICATIONS .......................................................................... 3
DIMENSIONS ................................................................................. 4
CLEARANCES................................................................................ 6
ELECTRICAL DATA ..................................................................... 7
WIRING ........................................................................................... 7
CONNECTION DIAGRAM............................................................ 8
WIRING DIAGRAM....................................................................... 9
FAN AND MOTOR SPECIFICATIONS ........................................ 12
REFRIGERATION CYCLE DIAGRAM........................................ 12
REFRIGERANT LINES .................................................................. 13
SYSTEM EVACUATION AND CHARGING ............................... 14
OPERATION MODES AND FUNCTIONS ................................... 15
TROUBLESHOOTING ................................................................... 20
ERROR DIAGNOSIS AND TROUBLESHOOTING WITHOUT
ERROR CODE................................................................................. 22
QUICK MAINTENANCE BY ERROR CODE .............................. 26
TROUBLESHOOTING BY ERROR CODE .................................. 27
DIAGNOSIS AND SOLUTION...................................................... 29
DISASSEMBLY INSTRUCTIONS ................................................ 45
APPENDICES.................................................................................. 65

SAFETY CONSIDERATIONS

Installing, starting up, and servicing air-conditioning equipment can
be hazardous due to system pressures, electrical components, and
equipment location (roofs, elevated structures, etc.).
Only trained, qualified installers and service mechanics should install,
start-up, and service this equipment.
Untrained personnel can perform basic maintenance functions such as
cleaning coils. All other operations should be performed by trained
service personnel.
When working on the equipment, observe the precautions in the
literature and on tags, stickers, and labels attached to the equipment.
Follow all safety codes. Wear safety glasses and work gloves. Keep a
quenching cloth and fire extinguisher nearby when brazing. Use care
in handling, rigging, and setting bulky equipment.
Read this manual thoroughly and follow all warnings or cautions included
in the literature and attached to the unit. Consult the 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 alert to the potential for personal injury. Understand these signal
words: DANGER, WARNING, and CAUTION.
Service Manual
These words are used with the safety-alert symbol. DANGER
identifies the most serious hazards which will result in severe personal
PAGE injury or death. WARNING signifies hazards which could result in
personal injury or death. CAUTION is used to identify unsafe
practices which may result in minor personal injury or product and
property damage. NOTE is used to highlight suggestions which will
result in enhanced installation, reliability, or operation.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Before installing, modifying, or servicing the system, the main
electrical disconnect switch must be in the OFF position. There may
be more than 1 disconnect switch. Lock out and tag switch with a
suitable warning label.
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or
improper operation.
Do not bury more than 36 in. (914 mm) of refrigerant pipe in the
ground. If any section of pipe is buried, there must be a 6 in. (152 mm)
vertical rise to the valve connections on the outdoor units. If more
than the recommended length is buried, refrigerant may migrate to the
cooler buried section during extended periods of system shutdown.
This causes refrigerant slugging and could possibly damage the
compressor at start-up.

INTRODUCTION

.
This service manual provides the necessary information to service,
repair, and maintain the indoor units. Section 2 of this manual has an
appendix with data required to perform troubleshooting. Use the
"TABLE OF CONTENTS" to locate a desired topic.
WARNING
WARNING
EXPLOSION HAZARD
Failure to follow this warning could
result in death, serious personal injury,
and/or property damage.
Never use air or gases containing oxygen
for leak testing or operating refrigerant
compressors. Pressurized mixtures of air
or gases containing oxygen can lead to
an explosion.
CAUTION