Carrier 38MPRAQ09AA3 - 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.
!

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

General Safety Precautions

Safety Symbols and Signal Words

CONNECTION DIAGRAM

Indoor and Outdoor Unit Wiring

WIRING DIAGRAM

09 K and 12 K Outdoor Unit Wiring

UNIT WIRING DIAGRAM

18 K and 24 K Outdoor Unit Wiring

REFRIGERATION CYCLE DIAGRAM

Heat Pump Refrigeration Diagram

REFRIGERANT LINES

General Refrigerant Line Sizing Guidelines

SYSTEM EVACUATION AND CHARGING

Deep Vacuum Method

Explains the process and importance of achieving a deep vacuum in the system.

Triple Vacuum Method

Step-by-step procedure for the triple evacuation method.

OPERATION MODES AND FUNCTIONS

Safety Features Overview

OPERATING MODES

HEATING Mode Operation

COOLING Mode Operation

DEFROSTING Mode Operation

TROUBLESHOOTING SAFETY

Capacitor Discharge Warning

Emphasizes the hazard of residual electricity in capacitors and discharge procedure.

TROUBLESHOOTING BY ERROR CODE

Indoor Unit Error Codes and Solutions

Lists error codes (E0-P4) and their corresponding solutions and page references.

TROUBLESHOOTING WITHOUT ERROR CODE

Remote Maintenance Troubleshooting

Table correlating possible causes with remote control and electrical/refrigerant circuit issues.

Field Maintenance - Electrical Circuit Issues

Table correlating electrical circuit issues with field maintenance checks.

Field Maintenance - Refrigerant Circuit Issues

Table correlating refrigerant circuit issues with field maintenance checks.

Field Maintenance - Other Issues

Table correlating other issues (load, bolts, capacity, piping) with field maintenance.

QUICK MAINTENANCE BY ERROR CODE

Error Code to Part Replacement Mapping

Guides on which parts to replace based on specific error codes.

TROUBLESHOOTING BY ERROR CODE

Temperature Sensor Resistance Check

Procedure to measure resistance of various temperature sensors.

IPM Continuity Check Procedure

Steps to check the continuity of the IPM module.

Compressor Winding Resistance Check

Method for measuring compressor winding resistance.

EEPROM Parameter Error Diagnosis and Solution

EEPROM Parameter Error (E0;F4;EA)

Diagnosing and resolving EEPROM parameter errors on PCBs.

Communication Error Diagnosis and Solution (E1)

Indoor;Outdoor Communication Error (E1)

Troubleshooting indoor/outdoor communication errors.

Zero Crossing Detection Error Diagnosis and Solution (E2)

Zero Crossing Detection Error (E2)

Diagnosing and resolving zero crossing detection errors.

Fan Speed Error Diagnosis and Solution (E3;F5)

Fan Speed Out of Range Error (E3;F5)

Troubleshooting indoor/outdoor fan speed errors.

FAN MOTOR DIAGNOSTICS

Indoor;Outdoor DC Fan Motor Checks

Indoor AC Fan Motor Checks

Occupancy Sensor Error Diagnosis and Solution (EF)

Occupancy Sensor Module Error (EF)

Diagnosing and resolving occupancy sensor module malfunctions.

Voltage Protection Error Diagnosis and Solution (P1)

Over;Under Voltage Protection Error (P1)

Troubleshooting over/under voltage protection issues.

IPM High Temperature Protection Diagnosis and Solution (P2)

IPM High Temperature Protection (P2)

Diagnosing and resolving IPM module high temperature protection.

Inverter Compressor Drive Error Diagnosis and Solution (P4)

Inverter Compressor Drive Error (P4)

Troubleshooting inverter compressor drive errors.

Temperature Sensor Error Diagnosis and Solution (E4;E5;F1;F2;F3)

Temperature Sensor Circuit Errors (E4;E5;F1;F2;F3)

Diagnosing open/short circuits in temperature sensors.

PCB Display Board Communication Error Diagnosis and Solution (Eb)

Indoor PCB to Display Board Communication Error (Eb)

Troubleshooting communication errors between indoor PCB and display board.

Overload Current Protection Diagnosis and Solution (F0)

Overload Current Protection (F0)

Diagnosing and resolving overload current protection issues.

IPM Malfunction;Over-Current Protection Diagnosis and Solution (P0)

IPM Malfunction; Over-Current Protection (P0)

Troubleshooting IPM malfunction and over-current protection.

PRESSURE CHARTS

Cooling Pressure Chart (R410 A)

Heating Pressure Chart (R410 A)

DISASSEMBLY INSTRUCTIONS

Outdoor Unit Panel Plate Removal (9 K-12 K)

Front Panel and Water Collecting Cover Removal (9 K-12 K)

Right Panel Removal (9 K-12 K)

Electrical Parts and PCB Board Removal (9 K-12 K)

Fan Motor Disassembly (9 K-12 K)

Sound Blanket Removal (9 K-12 K)

Four-Way Valve Disassembly (9 K-12 K)

Compressor Terminal Cover and Connectors (9 K-12 K)

Compressor Removal Procedures (9 K-12 K)

Outdoor Unit Panel Plate Removal (18 K-24 K)

Front Panel Removal (18 K-24 K)

Water Collecting Cover and Rear Screen Removal (18 K-24 K)

Right Panel Removal (18 K-24 K)

Electrical Parts and PCB Board Removal (18 K-24 K)

Fan Motor Disassembly (18 K-24 K)

Sound Blanket Removal (18 K-24 K)

Four-Way Valve Disassembly (18 K-24 K)

Compressor Terminal Cover and Connectors (18 K-24 K)

Compressor Removal Procedures (18 K-24 K)

Carrier 38MPRAQ09AA3 Specifications