Carrier 38MHRCQ12AA3 - User Manual

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Specifications subject to change without notice.

TABLE OF CONTENTS

PAGE

SAFETY CONSIDERATIONS ....................................................... 1

INTRODUCTION............................................................................ 1

MODEL / SERIAL NUMBER NOMENCLATURES .................... 2

SPECIFICATIONS (HEAT PUMP)................................................ 3

PERFORMANCE ............................................................................ 4

DIMENSIONS AND WEIGHTS .................................................... 5

CLEARANCES................................................................................ 9

ELECTRICAL DATA ..................................................................... 10

WIRING........................................................................................... 10

CONNECTION DIAGRAMS ......................................................... 11

WIRING DIAGRAMS (HEAT PUMP) .......................................... 12

REFRIGERATION CYCLE DIAGRAMS...................................... 15

SYSTEM EVACUATION AND CHARGING ............................... 20

TROUBLESHOOTING................................................................... 27

DIAGNOSIS AND SOLUTION...................................................... 31

DISASSEMBLY INSTRUCTIONS SIZES 9K (115V) - 18K (208/

230V)................................................................................................ 51

DISASSEMBLY INSTRUCTIONS SIZE 24K............................... 54

APPENDIX ...................................................................................... 57

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

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 outdoor units. 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

38MHRC

Outdoor Unit Single Zone Ductless System

Sizes 09 to 24

Main Page

Brand	Carrier
Model	38MHRCQ12AA3
Category	Air Conditioner
Language	English

Brand

Carrier

Model

38MHRCQ12AA3

Carrier 38MHRCQ12AA3 - User Manual

Table of Contents

Summary

Safety Considerations

Electrical Shock Hazard

Explosion Hazard

Equipment Damage Hazard

Introduction

Model and Serial Number Nomenclature

Specifications (Heat Pump)

Performance

Dimensions and Weights

Clearances

Clearances for Multiple Units

Electrical Data and Wiring

Recommended Connection Method for Power and Communication Wiring

Connection Diagrams

Wiring Diagrams (Heat Pump)

Refrigeration Cycle Diagrams

Refrigerant Lines and Applications

General Refrigerant Line Sizing

Long-Line Applications

System Evacuation and Charging

Deep Vacuum Method

Triple Evacuation Method

Electronic Functions and Operation Modes

Abbreviation

Main Protection

Operation Modes and Functions

Defrost Mode

Forced Defrosting Mode

Point Check Function

Troubleshooting Safety

Safety

Outdoor Unit Diagnostic Guide

PCB Diagrams

Diagnosis and Solution: EEPROM Error

EEPROM Parameter Error (E0;F4)

Diagnosis and Solution: Communication Error

Indoor and Outdoor Unit Communication Error (E1)

Diagnosis and Solution: Zero Crossing Error

Zero Crossing Detection Error Diagnosis and Solution (E2)

Diagnosis and Solution: Fan Speed Error

The Indoor Fan Speed is Operating Outside of the Normal Range (E3;F5)

Diagnosis and Solution: Motor Errors

Index 1

Diagnosis and Solution: Sensor Errors

Open Circuit or Short Circuit of Temperature Sensor Diagnosis and Solution (E4;E5;F1;F2;F3)

Diagnosis and Solution: Refrigerant Leak

Refrigerant Leakage Detection Diagnosis and Solution (EC)

Diagnosis and Solution: Overload Protection

Overload Current Protection Diagnosis and Solution (F0)

Diagnosis and Solution: IPM;IGBT Errors

IPM Malfunction or IGBT Over-Strong Current Protection Diagnosis and Solution (P0)

Diagnosis and Solution: Voltage Protection

Over Voltage or Too Low Voltage Protection Diagnosis and Solution (P1)

Diagnosis and Solution: Compressor High Temp

High Temperature Protection of Compressor Top Diagnosis and Solution (P2)

Diagnosis and Solution: Inverter Drive Error

Inverter Compressor Drive Error Diagnosis and Solution (P4)

Main Parts Check

Diagnosis and Solution: Component Checks

Compressor Checking

IPM Continuity Check

Fan Motor

Pressure on the Service Port (Cooling)

Pressure on the Service Port (Heating)

Disassembly Instructions Sizes 9 K (115 V) - 18 K (208;230 V)

Disassembly Instructions Size 24 K

Appendix

Appendix 1

Appendix 2

Appendix 3