Carrier 40MAHBQ06XA - User Manual

Specifications subject to change without notice.
TABLE of CONTENTS
PAGE
INTRODUCTION............................................................................ 1
MODEL / SERIAL NUMBER NOMENCLATURES .................... 2
SPECIFICATIONS .......................................................................... 3
COMPATIBILITY........................................................................... 3
DIMENSIONS ................................................................................. 4
CLEARANCES................................................................................ 4
ELECTRICAL DATA ..................................................................... 5
WIRING........................................................................................... 5
CONNECTION DIAGRAMS ......................................................... 6
WIRING DIAGRAM....................................................................... 7
REFRIGERATION CYCLE DIAGRAM........................................ 8
REFRIGERANT LINES .................................................................. 8
FAN AND MOTOR SPECIFICATIONS........................................ 9
SYSTEM EVACUATION AND CHARGING ............................... 10
TROUBLESHOOTING................................................................... 15
INDOOR UNIT DIAGNOSTIC GUIDE......................................... 16
DIAGNOSIS AND SOLUTION...................................................... 17
APPENDICIES ................................................................................ 34
DISASSEMBLY INSTRUCTIONS ................................................ 37
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 40MAHB family of heat pumps. This manual
has an appendix (see “APPENDICIES” on page 34) with data
required to perform troubleshooting. 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 the system, the
main electrical disconnect switch must be in the OFF
position. There may be more than 1 disconnect switch. Lock
out and tag switch (es) 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 a system shutdown. This causes
refrigerant slugging and could possibly damage the
compressor at start-up.
CAUTION
Service Manual
40MAHB
High Wall Ductless System
Sizes 06 to 36

Carrier 40MAHBQ06XA Specifications

General

Type	Ductless Mini Split
Cooling Capacity	6, 000 BTU/h
Refrigerant	R-410A
Voltage (V)	115
Weight (Indoor Unit)	17.6 lbs
Height (in)	11.22

Summary

Introduction to the Service Manual

Model and Serial Number Nomenclature

Specifications

Compatibility Information

Details on the compatibility of indoor units with outdoor units.

Dimensions and Clearances

Electrical Data and Wiring

Connection Diagrams

Wiring Diagram

Refrigeration Cycle and Lines

Fan and Motor Specifications

System Evacuation and Charging

Vacuum Pump Evacuation Methods

Covers methods like deep vacuum and triple evacuation for system charging.

Final Tubing Check

Important checks for refrigerant lines to prevent damage or leaks.

Unit Protections

Fan Speed and Inverter Module Protections

Covers protections related to fan speed control and inverter module.

Indoor Fan, Zero Crossing, and Sensor Protections

Details protections for indoor fan, zero crossing, and sensor malfunctions.

Operating Modes and Controls

FAN, COOLING, and Evaporator Temperature Control

Details on FAN mode, COOLING mode fan rules, and evaporator temperature protection.

Heating and Defrosting Modes

Heating Mode Operation and Defrosting

Heating mode fan rules, anti-cold air function, and defrosting mode operation.

Auto and Drying Modes

Auto and Drying Mode Functions

Operation of AUTO mode and features/protections in DRYING mode.

Advanced Operational Features

Evaporator Protection, Outdoor Fan, and Forced Operation

Covers evaporator anti-freezing, outdoor fan behavior, and forced operation modes.

Auto-Restart, Refrigerant Leakage, and Louver Memory

Discusses auto-restart, leak detection, and louver position memory functions.

Silence Operation and Point Check

Features for quiet operation and checking unit information via remote controller.

Troubleshooting

Safety Precautions for Troubleshooting

Important safety warnings, especially regarding capacitor discharge.

Indoor Unit Diagnostic Guide

Indoor Unit Error Display Codes

List and description of error codes displayed by the indoor unit.

Diagnosis and Solution

EEPROM Parameter Error Diagnosis (E0;F4)

Troubleshooting for EEPROM parameter errors, including causes and conditions.

Diagnosis and Solution

Communication Error Diagnosis (E1)

Guides through troubleshooting communication errors between indoor and outdoor units.

Diagnosis and Solution

DC Voltage Testing Procedure

Instructions for testing DC voltage between unit terminals using a multimeter.

Reactor Resistance Testing

Procedure for testing reactor resistance to identify malfunctions.

Diagnosis and Solution

Zero Crossing Detection Error Diagnosis (E2)

Troubleshooting steps for zero crossing detection errors in the PCB.

Diagnosis and Solution

Fan Speed Control Error Diagnosis (E3;F5)

Steps to diagnose and resolve indoor fan speed control errors.

Diagnosis and Solution

Fan Motor Diagnosis

Troubleshooting for indoor and outdoor DC fan motors and indoor AC fan motors.

Diagnosis and Solution

Temperature Sensor Error Diagnosis (E4;E5;F1;F2;F3)

Steps to diagnose open or short circuits in temperature sensors.

Diagnosis and Solution

Refrigerant Leakage Detection Diagnosis (EC)

Troubleshooting for refrigerant leakage detection, including sensor and system checks.

Diagnosis and Solution

Overload Current Protection Diagnosis (F0)

Troubleshooting steps for overload current protection issues.

Diagnosis and Solution

IPM or IGBT Over-Current Protection Diagnosis (P0)

Diagnosing IPM malfunction or IGBT over-current protection errors.

Diagnosis and Solution

PCB Voltage Measurement P-U

Visual guide for measuring PCB voltage points P and U.

PCB Voltage Measurement P-V

Visual guide for measuring PCB voltage points P and V.

Diagnosis and Solution

PCB Voltage Measurement P-W

Visual guide for measuring PCB voltage points P and W.

PCB Voltage Measurement N-U

Visual guide for measuring PCB voltage points N and U.

Diagnosis and Solution

PCB Voltage Measurement N-V

Visual guide for measuring PCB voltage points N and V.

PCB Voltage Measurement N-W

Visual guide for measuring PCB voltage points N and W.

Diagnosis and Solution

Over Voltage or Low Voltage Protection Diagnosis (P1)

Troubleshooting for over voltage or low voltage protection issues.

Diagnosis and Solution

Compressor High Temperature Protection Diagnosis (P2)

Steps to diagnose and resolve compressor high temperature protection errors.

Diagnosis and Solution

Inverter Compressor Drive Error Diagnosis (P4)

Diagnosing abnormal inverter compressor drive signals and performance.

Main Parts Check

Temperature Sensor Resistance Checking

Procedure for checking the resistance of various temperature sensors.

Appendices

Appendix 1: T1, T2, T3, T4 Sensor Resistance Values

Table of resistance values for temperature sensors T1, T2, T3, and T4.

Appendix 2: T5 Sensor Resistance Values

Table of resistance values for the T5 temperature sensor.

Appendix 3: Temperature Conversion Table

Table for temperature conversions (Fahrenheit to Celsius).

IPM Continuity Check

Disassembly Instructions

Front Panel Disassembly

Step-by-step guide to removing and disassembling the front panel of the indoor unit.

Disassembly Instructions

Electrical Parts Disassembly

Instructions for safely disassembling electrical components, requiring anti-static gloves.

Disassembly Instructions

Evaporator Disassembly

Procedures for removing the evaporator, including front panel, electrical parts, and fan.

Disassembly Instructions

Fan Motor and Fan Disassembly

Steps to remove the fan motor and fan assembly from the indoor unit.