Carrier 38MGR Series User Manual (English)

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TABLE of CONTENTS

PAGE

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

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

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

SPECIFICATIONS .......................................................................... 3

DIMENSIONS ................................................................................. 4

CLEARANCES................................................................................ 8

ELECTRICAL DATA ..................................................................... 9

WIRING........................................................................................... 9

CONNECTION DIAGRAMS .........................................................10

AUTOMATIC WIRING/PIPING CORRECTION ......................... 13

WIRING DIAGRAMS..................................................................... 14

REFRIGERATION CYCLE DIAGRAMS......................................22

REFRIGERANT LINES .................................................................. 24

SYSTEM EVACUATION AND CHARGING ............................... 25

ELECTRONIC FUNCTION............................................................26

TROUBLESHOOTING................................................................... 31

OUTDOOR UNIT DIGITAL DISPLAY.........................................32

OUTDOOR UNIT DISPLAY.......................................................... 32

APPENDICES..................................................................................64

DISASSEMBLY INSTRUCTIONS SIZE 18.................................. 72

DISASSEMBLY INSTRUCTIONS SIZE 24.................................. 80

DISASSEMBLY INSTRUCTIONS SIZE 30.................................. 89

DISASSEMBLY INSTRUCTIONS SIZES 36 AND 48................. 96

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 multi-zone family of heat pumps. This

manual has an appendix with data required to perform

troubleshooting. See “APPENDICES” on page 64. Use the “TABLE

of CONTENTS” on page 1 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.

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

38MGR

Multi-zone Outdoor Unit Ductless System

Sizes 18, 24, 30, 36 and 48

Refrigerant	R-410A
Voltage	208/230V
Dimensions (Outdoor Unit)	Varies by model
Weight (Outdoor Unit)	Varies by model
Type	Air Conditioner

Carrier 38MGR Series User Manual

Table of Contents

Carrier 38MGR Series Specifications

Summary

SAFETY CONSIDERATIONS

HAZARD WARNINGS

MODEL AND SPECIFICATIONS

Model/Serial Number and Unit Sizes

System Specifications

DIMENSIONS AND CLEARANCES

Unit Dimensions and Clearances

ELECTRICAL DATA AND WIRING

Electrical Data and Wiring Requirements

CONNECTION DIAGRAMS

Wiring Diagrams for Unit Sizes

AUTOMATIC WIRING/PIPING CORRECTION

Correction Process and Diagram

WIRING DIAGRAMS

Size 18K Wiring Details

WIRING DIAGRAMS (CONT)

Size 24K Wiring Details

WIRING DIAGRAMS (CONT)

Size 30K Wiring Details

WIRING DIAGRAMS (CONT)

Size 36K Wiring Details

WIRING DIAGRAMS (CONT)

Size 48K Wiring Details

REFRIGERATION CYCLE DIAGRAMS

Cycle Diagrams for Unit Sizes

REFRIGERANT LINES AND CHARGING

Line Sizing, Long Lines, and Charging

SYSTEM EVACUATION AND CHARGING

Vacuum Pump and Evacuation Methods

ELECTRONIC FUNCTIONS AND PROTECTIONS

Unit Protections and Controls

OPERATING MODES AND CONTROLS

Cooling and Heating Mode Operations

Defrosting Control

TROUBLESHOOTING OVERVIEW

Diagnostic Tools and Steps

Outdoor Unit Display Codes

OUTDOOR UNIT DISPLAY CODES

Digital Display Functions and Codes

Unit Point Function

OUTDOOR UNIT DISPLAY (CONT)

Table of Outdoor PCB Display Codes

DIAGNOSIS AND SOLUTION: FAN ISSUES

Indoor Fan Speed Out of Control (E0/E4)

DIAGNOSIS AND SOLUTION: MODE CONFLICTS

Indoor Units Mode Conflict (P5)

DIAGNOSIS AND SOLUTION: PCB ERRORS

EEPROM Parameter Error (EO/E4)

DIAGNOSIS AND SOLUTION: COMMUNICATION ERRORS

Indoor/Outdoor Unit Communication (E2/E1)

DIAGNOSIS AND SOLUTION: IPM/BOARD TESTS

IPM Board and Voltage Testing

DIAGNOSIS AND SOLUTION: DETECTION ERRORS

Zero Crossing Detection Error (E2)

DIAGNOSIS AND SOLUTION: COMMUNICATION ERRORS (CONT)

IPM to Outdoor Main Board Comm. (E3)

DIAGNOSIS AND SOLUTION: SENSOR ERRORS

Temperature Sensor Circuit Errors (E4/F1-F6)

DIAGNOSIS AND SOLUTION: VOLTAGE PROTECTION

Voltage Protection Error (E5)

DIAGNOSIS AND SOLUTION: PFC MODULE PROTECTION

PFC Module Protection Error (E6)

DIAGNOSIS AND SOLUTION: FAN SPEED CONTROL

Outdoor Fan Speed Out of Control (E8)

DIAGNOSIS AND SOLUTION: COMPRESSOR PROTECTION

Compressor Top Temperature Error (PO)

DIAGNOSIS AND SOLUTION: PRESSURE PROTECTION

High Pressure Protection Error (P1)

DIAGNOSIS AND SOLUTION: PRESSURE PROTECTION (CONT)

Low Pressure Protection Error (P2)

DIAGNOSIS AND SOLUTION: COMPRESSOR PROTECTION (CONT)

Compressor Current Protection Error (P3)

DIAGNOSIS AND SOLUTION: COMPRESSOR PROTECTION (CONT)

Compressor Discharge Temp. Error (P4)

DIAGNOSIS AND SOLUTION: CONDENSER PROTECTION

High Temp. Protection of Condenser Error (P5)