Carrier 38MBRQ36A-3 - User Manual

Specifications subject to change without notice.
TABLE of CONTENTS
PAGE
SA\FETY CONSIDERATIONS ...................................................... 1
INTRODUCTION............................................................................ 1
MODEL / SERIAL NUMBER NOMENCLATURES .................... 2
WIRING........................................................................................... 3
CONNECTION DIAGRAM............................................................ 3
WIRING DIAGRAMS..................................................................... 4
REFRIGERATION CYCLE DIAGRAM........................................ 8
REFRIGERANT LINES .................................................................. 9
SYSTEM EVACUATION AND CHARGING ............................... 10
SYSTEM VACUUM AND CHARGE ............................................ 10
ELECTRONIC FUNCTIONS ......................................................... 11
POINT CHECK FUNCTION .......................................................... 14
TROUBLESHOOTING................................................................... 16
DIAGNOSTIC GUIDES.................................................................. 17
DIAGNOSIS AND SOLUTION...................................................... 18
DISASSEMBLY INSTRUCTIONS SIZE 36.................................. 47
DISASSEMBLY INSTRUCTIONS SIZE 48-58 ............................ 53
SA\FETY 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 38MBR family of heat pumps. Use the
“TABLE of CONTENTS” on page 1 to locate a desired topic. For
detailed information regarding product specifications refer to product
data documentation.
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.
WA RNING
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.
WA RNING
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
38MBR
Outdoor Unit Single Zone Ductless System
Sizes 36 to 58

Summary

SAFETY CONSIDERATIONS

General Safety Warnings

Important warnings about electrical, explosion, and equipment damage hazards.

WIRING

Power and Communication Wiring

Details on field-supplied power and communication wiring from outdoor to indoor unit.

Communication Wiring

REFRIGERANT LINES

General Refrigerant Line Sizing

Guidelines for sizing refrigerant lines, insulation, and installation.

SYSTEM EVACUATION AND CHARGING

Using Vacuum Pump

Procedure for evacuating the system using a vacuum pump.

Deep Vacuum Method

Explains the deep vacuum method for system evacuation.

Triple Evacuation Method

Details the triple evacuation method for ensuring a dry system.

ELECTRONIC FUNCTIONS

Main Protection Features

Details various protection mechanisms like delay, temperature, and overload protections.

Operation Modes and Functions

Defrosting Mode

Defrost Exit Conditions

Evaporator Coil Temperature Protection

TROUBLESHOOTING

DIAGNOSTIC GUIDES

Table 13 - Indoor Unit Error Display

Table of indoor unit error codes, LED status, and solutions.

Table 14 - Error Display on Two Way Communication Wired Controller

Table of error codes for the wired controller.

DIAGNOSIS AND SOLUTION

Outdoor Unit Error Display

Table guiding diagnosis and solutions for outdoor unit error codes.

Table 15 - Diagnostic Guide for Outdoor Units

Comprehensive guide for outdoor unit error codes and their solutions.

EEPROM Parameter Error - Diagnosis and Solution (E0;F4)

Overload Current Protection Diagnosis and Solution (F0)

Indoor; Outdoor Units Communication Error - Diagnosis and Solution (E1)

Fan Speed is operating outside of the Normal Range (E3;F5)

Temperature Sensor Diagnosis and Solution (E4;E5;F1;F2;F3)

Refrigerant Leakage Detection Diagnosis and Solution (EC)

IPM Malfunction or Over-strong Current Protection Diagnosis and Solution (PO)

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

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

Inverter Compressor Drive Error Diagnosis and Solution (P4)

Outdoor IPM Module Temperature Sensor Malfunction Diagnosis and Solution (P7)

JO Malfunction

Evaporator high temperature protection

Troubleshooting for evaporator high temperature protection (J0).

J1 Malfunction

High temperature condenser protection

Troubleshooting for high temperature condenser protection (J1).

J2 Malfunction

Temperature protection of condenser discharge

Troubleshooting for compressor discharge temperature protection (J2).

J3 Malfunction

PFC module protection

Troubleshooting for PFC module protection (J3).

J4 Malfunction

Communication error between outdoor chip and compressor drive board

Troubleshooting communication errors between outdoor main chip and compressor drive board (J4).

J5 Malfunction

High pressure protection

Troubleshooting for high pressure protection (J5).

J6 Malfunction

Low pressure protection

Troubleshooting for low pressure protection (J6/P6).

J8 Malfunction

AC power input voltage protection

Troubleshooting AC power input voltage protection (J8).

DISASSEMBLY INSTRUCTIONS SIZE 36

Fan Assembly

4-Way Valve

DISASSEMBLY INSTRUCTIONS SIZE 48-58

Fan assembly

Panel plate

Electrical parts

Compressor

The 4-way valve

Expansion valve

Carrier 38MBRQ36A-3 Specifications

General

Brand	Carrier
Model	38MBRQ36A-3
Category	Heat Pump
Language	English