Carrier 38MHRBC12AA1 User Manual

Service Manual
38MHRB
Outdoor Unit Single Zone Ductless System
Sizes 09 to 24
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 1.........................
INTRODUCTION 1...................................
MODEL/SERIAL NUMBER NOMENCLATURES 2.........
SPECIFICATIONS 3...................................
DIMENSIONS 5.....................................
CLEARANCES 8.....................................
ELECTRICAL DATA 9................................
WIRING 9...........................................
CONNECTION DIAGRAMS 10.........................
WIRING DIAGRAMS 11...............................
REFRIGERATION CYCLE DIAGRAMS 17................
REFRIGERANT LINES 18.............................
SYSTEM EVACUATION AND CHARGING 19.............
ELECTRONIC FUNCTIONS 18.........................
TROUBLESHOOTING 23..............................
OUTDOOR UNIT DIAGNOSTIC GUIDES 24..............
PCB DIAGRAMS 25..................................
DIAGNOSIS AND SOLUTION 27.......................
DISASSEMBLY INSTRUCTIONS 48.....................
APPENDIX 71.......................................
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 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
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 literature and attached to the unit. Consult 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.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing, modifying, or servicing system, 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.
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
CAUTION
!
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 outdoor 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.

Carrier 38MHRBC12AA1 Specifications

General

Model	38MHRBC12AA1
Cooling Capacity	12000 BTU/h
Refrigerant	R-410A
Voltage	208/230V
Phase	1
Compressor Type	Rotary
Voltage (V)	208/230V
Type	Mini Split
EER	11.0

Summary

Safety Considerations and Warnings

Safety Alert Symbols and Signal Words

Explains hazard identification using signal words like DANGER, WARNING, CAUTION.

Electrical Shock Hazard Warning

Warns of severe personal injury or death from electrical shock.

Explosion Hazard Warning

Warns of explosion risk from air/oxygen mixtures in refrigerant systems.

Equipment Damage Hazard Caution

Specifications Overview

Cooling Only Specifications

Heat Pump Specifications

Electrical Data and Wiring

Cooling Only Electrical Specifications

Heat Pump Electrical Specifications

Power and Communication Wiring

Guides on proper wiring practices, including wire sizing, types, and connection methods.

Wiring Diagrams (Cooling Only)

Cooling Only 115V Unit Wiring

Provides the detailed wiring diagram for the 115V cooling-only unit, listing component connections.

Cooling Only 230V Unit Wiring

Details the wiring diagram for the 230V cooling-only unit, including component connections.

Cooling Only 18-24K Unit Wiring

Presents the wiring diagram for cooling-only 18K and 24K sizes, detailing component connections.

Wiring Diagrams (Heat Pump)

Heat Pump 115V Unit Wiring

Provides the wiring diagram for the 115V heat pump unit, detailing component connections.

Heat Pump 230V Unit Wiring (09, 12, 18)

Heat Pump 230V Unit Wiring (24)

Refrigeration Cycle Diagrams

Heat Pump Refrigeration Cycle

Refrigerant Lines

General Refrigerant Line Sizing Guidelines

System Evacuation and Charging

Vacuum Pump Evacuation and Charging

Step-by-step instructions for evacuating and charging the system using a vacuum pump.

Deep Vacuum Method Explained

Explains the deep vacuum method for system evacuation, including required equipment.

Triple Evacuation Method Procedure

Details the triple evacuation method for system evacuation and leak testing.

Troubleshooting Safety

Capacitor Safety and Discharge

Details safety precautions for high-voltage electrolytic capacitors and their discharge procedure.

Outdoor Unit Diagnostic Guides

LED Status Codes for Troubleshooting

Lists diagnostic codes indicated by LED lights for identifying unit malfunctions.

Diagnosis and Solution

EEPROM Parameter Error (E0/F4)

Provides steps to diagnose and resolve EEPROM parameter errors (E0/F4).

Communication Error (E1)

Outlines the diagnosis and solution for communication errors between indoor and outdoor units (E1).

Zero Crossing Detection Error (E2)

Provides troubleshooting steps for zero crossing detection errors (E2).

Fan Speed Control Error (E3/F5)

Details troubleshooting for indoor fan speed control issues (E3/F5).

Fan Motor Diagnosis

AC Fan Motor Diagnosis

Temperature Sensor Errors (E4/E5/F1/F2/F3)

Provides troubleshooting for temperature sensor open circuit or short circuit faults (E4/E5/F1/F2/F3).

Refrigerant Leakage Detection (EC)

Details diagnosis and solution for refrigerant leakage detection errors (EC).

Overload Current Protection (F0)

Provides troubleshooting steps for overload current protection faults (F0).

IPM/IGBT Over-Current Protection (P0)

Details troubleshooting for IPM malfunction or IGBT over-current protection (P0).

Over/Under Voltage Protection (P1)

Provides troubleshooting for over/under voltage protection faults (P1).

Compressor Top High Temperature Protection (P2)

Details troubleshooting for compressor top high temperature protection (P2).

Inverter Compressor Drive Error (P4)

Outlines troubleshooting for inverter compressor drive errors (P4).

Component Testing Procedures

Disassembly Instructions (12K 115V)

Panel Plate Removal

Fan Assembly Removal

Electrical Parts Removal

Four-Way Valve Removal

Compressor Removal

Disassembly Instructions (12K 208-230V)

Panel Plate Removal (12K 208-230V)

Fan Assembly Removal (12K 208-230V)

Electrical Parts Removal (12K 208-230V)

Four-Way Valve Removal (12K 208-230V)

Compressor Removal (12K 208-230V)

Disassembly Instructions (18K 208-230V)

Panel Plate Removal (18K 208-230V)

Fan Assembly Removal (18K 208-230V)

Electrical Parts Removal (18K 208-230V)

Four-Way Valve Removal (18K 208-230V)

Compressor Removal (18K 208-230V)

Disassembly Instructions (24K 208-230V)

Panel Plate Removal (24K 208-230V)

Fan Assembly Removal (24K 208-230V)

Electrical Parts Removal (24K 208-230V)

Four-Way Valve Removal (24K 208-230V)

Compressor Removal (24K 208-230V)