Carrier 38MARBQ09AA3 - User Manual

Specifications subject to change without notice.
TABLE of CONTENTS
PAGE
INTRODUCTION............................................................................ 1
MODEL / SERIAL NUMBER NOMENCLATURES .................... 2
SPECIFICATIONS - HEAT PUMP ................................................ 3
DIMENSIONS AND WEIGHTS .................................................... 4
CLEARANCES................................................................................ 7
ELECTRICAL DATA ..................................................................... 8
WIRING........................................................................................... 8
CONNECTION DIAGRAMS ......................................................... 9
WIRING DIAGRAMS..................................................................... 10
FAN AND MOTOR SPECIFICATIONS........................................ 14
REFRIGERATION CYCLE DIAGRAMS...................................... 15
REFRIGERANT LINES .................................................................. 22
SYSTEM EVACUATION AND CHARGING ............................... 23
ELECTRONIC FUNCTIONS ......................................................... 24
POINT CHECK FUNCTION .......................................................... 29
TROUBLESHOOTING................................................................... 30
INDOOR UNIT DIAGNOSTIC GUIDES....................................... 31
DIAGNOSIS AND SOLUTION...................................................... 32
DISASSEMBLY INSTRUCTIONS ................................................ 65
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
coil cleaning. 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 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 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 38MARB family of heat pumps. 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 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.
WAR N I N G
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.
WAR N I N G
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
38MARB
Outdoor Unit Single Zone Ductless System
Sizes 09 to 36

Summary

Introduction

Model and Serial Number Nomenclature

Details product model and serial number identification conventions.

Heat Pump Specifications

Lists technical specifications for heat pump models, including operating ranges and electrical data.

Dimensions and Weights

Provides physical dimensions and weight information for various unit sizes.

Clearances

Specifies required installation clearances for optimal airflow and service access.

Electrical Data

Presents essential electrical data, including voltage, current, and protection ratings.

Wiring

Covers recommended wiring practices and connection methods for system installation.

Connection Diagrams

Illustrates electrical connection diagrams for outdoor and indoor units.

Wiring Diagrams

Provides detailed wiring diagrams for different unit sizes and configurations.

Fan and Motor Specifications

Lists specifications related to fan and motor components for various models.

Refrigeration Cycle Diagrams

Shows diagrams illustrating the refrigerant flow and components in the system.

Refrigerant Lines

Details sizing, length, and additional charge requirements for refrigerant lines.

System Evacuation and Charging

Outlines procedures for evacuating the system and charging refrigerant.

Electronic Functions

Explains the various electronic functions, protections, and operating modes.

Point Check Function

Describes how to access and interpret diagnostic codes via the display.

Troubleshooting

Offers guidance for diagnosing and resolving common system issues.

Indoor Unit Diagnostic Guides

Lists error codes, LED status, and solutions for indoor unit problems.

Diagnosis and Solution

Provides solutions for outdoor unit error displays and diagnostic tables.

Disassembly Instructions

Details the step-by-step procedures for disassembling the outdoor unit.

Carrier 38MARBQ09AA3 Specifications

General

Cooling Capacity	9, 000 BTU/h
Refrigerant	R-410A
SEER Rating	Up to 19
HSPF Rating	Up to 10
Voltage	208/230 V
Phase	1
Compressor Type	Inverter