Carrier 38MPRAQ24AA3 - User Manual

TABLE OF CONTENTS
PAGE
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.
These words are used with the safety-alert symbol. DANGER
identifies the most serious hazards which will result in severe personal
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.
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.
!
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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.
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.
WARNING
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.
CAUTION
Service Manual
38MPRA
Outdoor Unit Single Zone Ductless System
Sizes 09 to 24

Summary

SAFETY CONSIDERATIONS

SPECIFICATIONS

ELECTRICAL DATA

WIRING

Covers power and communication wiring recommendations and precautions.

CONNECTION DIAGRAM

WIRING DIAGRAM

REFRIGERANT LINES

SYSTEM EVACUATION AND CHARGING

OPERATION MODES AND FUNCTIONS

Safety Features

COOLING Mode

HEATING Mode

AUTO Mode

ECO Function

TROUBLESHOOTING

Troubleshooting (continued)

Error Display (Indoor Unit)

ERROR DIAGNOSIS AND TROUBLESHOOTING WITHOUT ERROR CODE

Field Maintenance

QUICK MAINTENANCE BY ERROR CODE

Error Codes

Provides tables linking error codes to specific parts requiring replacement.

TROUBLESHOOTING BY ERROR CODE

IPM Continuity Check

DIAGNOSIS AND SOLUTION

E1 (Indoor and Outdoor Unit Communication Error)

E2 (Zero crossing detection error diagnosis and solution)

E3;F5 (Fan speed is operating outside of the Normal Range)

EF (Occupancy Sensor Module Error Diagnosis and Solution)

P1 (Over voltage or too low voltage protection diagnosis and solution)

P2 (High temperature protection of IPM module diagnosis and solution)

P4 (Inverter compressor drive error diagnosis and solution)

E4;E5;F1;F2;F3 (Open circuit or short circuit of temperature sensor diagnosis and solution)

Eb (Communication error between the Indoor PCB and Display Board)

F0 (Overload current protection diagnosis and solution)

P0 (IPM malfunction or IGBT over-strong current protection diagnosis and solution)

DISASSEMBLY INSTRUCTIONS

Carrier 38MPRAQ24AA3 Specifications