Carrier 38MPRAQ12AA3 - 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

Hazard Identification and Warnings

Explains signal words, safety alert symbol, and specific hazard warnings.

WIRING

Wiring Requirements and Recommendations

WIRING DIAGRAM

09 K;12 K Model Wiring Details

WIRING DIAGRAM (continued)

18 K;24 K Model Wiring Details

REFRIGERATION CYCLE DIAGRAM

Heat Pump Refrigeration Cycle Diagram

REFRIGERANT LINES

Refrigerant Line Sizing and Charging

SYSTEM EVACUATION AND CHARGING

Vacuum Pump Evacuation Procedure

Step-by-step guide on using a vacuum pump for system evacuation.

Triple Evacuation Method

Detailed procedure for the triple evacuation method, including nitrogen use.

OPERATION MODES AND FUNCTIONS

Safety Features Overview

Explains compressor delay, discharge temp shutoff, fan speed shutoff, inverter protection.

OPERATION MODES AND FUNCTIONS (continued)

FAN, COOLING, and Protection Modes

HEATING, DEFROSTING, and AUTO Modes

TROUBLESHOOTING

Capacitor Safety and Discharge Procedures

Warning about residual electricity and safe discharge procedures for capacitors.

TROUBLESHOOTING (continued)

Indoor Unit Error Display and Error Codes

How error codes are displayed and a table listing error codes and solutions.

ERROR DIAGNOSIS WITHOUT ERROR CODE

Remote Maintenance Troubleshooting Guide

Table correlating possible causes with remote control and other troubleshooting actions.

ERROR DIAGNOSIS WITHOUT ERROR CODE (continued)

Field Maintenance: Electrical Circuit Issues

Table correlating electrical issues with field maintenance tests and remedies.

Field Maintenance: Refrigerant Circuit Issues

Table correlating refrigerant circuit issues with field maintenance tests and remedies.

QUICK MAINTENANCE BY ERROR CODE

Error Code Part Replacement Guide

Table indicating parts to replace for specific error codes E0-F5 and P0-P4.

TROUBLESHOOTING BY ERROR CODE

Temperature Sensor and Compressor Checks

Procedures for checking temperature sensors and compressor windings.

TROUBLESHOOTING BY ERROR CODE (continued)

IPM Continuity Check Procedure

Table and procedure for checking IPM continuity using a multimeter.

DIAGNOSIS AND SOLUTION

EEPROM Parameter Error (E0;F4;EA)

Diagnosis and solution for EEPROM parameter errors, including PCB replacement.

DIAGNOSIS AND SOLUTION (continued)

E1 Indoor;Outdoor Communication Error

Troubleshooting steps for communication errors between indoor and outdoor units.

E3;F5 Fan Speed Out of Range Error

Troubleshooting steps for indoor/outdoor fan speed errors.

P1 Voltage Protection Diagnosis and Solution

Diagnosis and solution for over/under voltage protection errors.

P4 Inverter Compressor Drive Error

Temperature Sensor Errors (E4;E5;F1-F3)

Pressure on Service Port

Cooling Chart (R410 A)

Pressure on Service Port (continued)

Heating Chart (R410 A)

DISASSEMBLY INSTRUCTIONS

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

DISASSEMBLY INSTRUCTIONS (continued)

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

Fan Disassembly (9 K-12 K)

Four-way Valve Removal (9 K-12 K)

Compressor Removal (9 K-12 K)

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

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

Fan Disassembly (18 K-24 K)

Four-way Valve Removal (18 K-24 K)

Compressor Removal (18 K-24 K)

Carrier 38MPRAQ12AA3 Specifications