Carrier 40MAHB Series User Manual

Specifications subject to change without notice.
TABLE of CONTENTS
PAGE
INTRODUCTION............................................................................ 1
MODEL / SERIAL NUMBER NOMENCLATURES .................... 2
WIRING........................................................................................... 3
CONNECTION DIAGRAMS ......................................................... 4
WIRING DIAGRAM....................................................................... 5
REFRIGERATION CYCLE DIAGRAM........................................ 6
REFRIGERANT LINES .................................................................. 6
FAN AND MOTOR SPECIFICATIONS........................................ 7
SYSTEM EVACUATION AND CHARGING ............................... 8
INQUIRY MODE ............................................................................ 12
TROUBLESHOOTING................................................................... 13
INDOOR UNIT DIAGNOSTIC GUIDES....................................... 14
DIAGNOSIS AND SOLUTION...................................................... 15
APPENDICIES ................................................................................ 37
DISASSEMBLY INSTRUCTIONS ................................................ 40
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 37) 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 40MAHB Series Specifications

General

Series	40MAHB
Refrigerant	R-410A
Voltage	208-230V
Power Supply	1-phase, 60Hz
Dimensions (Indoor Unit)	Varies by model
Net Weight (Indoor Unit)	Varies by model
Dimensions (Outdoor Unit)	Varies by model
Net Weight (Outdoor Unit)	Varies by model

Summary

Safety Warnings

Electrical Shock Hazard

Warning about electrical shock during installation/servicing.

Explosion Hazard

Warning about explosion risk with oxygen/air mixtures.

Equipment Damage Hazard

Caution about potential equipment damage from improper practices.

Introduction and System Overview

Model and Serial Number Identification

Wiring and Connections

Power and Communication Wiring

Guide for connecting power and communication wires.

Electrical Connection Diagrams

Wiring Diagram Details

Refrigeration System

Refrigerant Lines and Insulation

Information on insulating refrigerant lines.

Fan and Motor Specifications

System Evacuation and Charging

Deep Vacuum Evacuation Method

Procedure for achieving a deep vacuum for system evacuation.

Triple Evacuation Method

Alternative method for system evacuation using dry nitrogen.

Final Tubing Inspection

Inspection of refrigerant tubing after installation.

Unit Protection Mechanisms

Fan Speed Control Protections

Protections related to indoor fan speed control.

Inverter Module Protections

Protection functions of the inverter module.

Fan Delay & Zero Crossing Errors

Issues with indoor fan startup delay and zero crossing detection.

Sensor Circuit Protections

Protection for sensor open circuits or disconnections.

Operating Modes and Functions

Fan Mode Operations

Details of the FAN mode operation.

Cooling Mode Fan Rules

Rules governing indoor fan speed in cooling mode.

Evaporator Temperature Protection

Protection mechanism based on evaporator temperature.

Heating Mode Fan Rules

Rules for indoor fan speed in heating mode.

Auto Fan in Heating Mode

Auto fan behavior during heating operations.

Defrosting Mode Operation

Description of the defrosting mode.

Drying Mode Operation

Details of the drying mode, including protection.

Evaporator Coil Temperature Protection

Protection against low evaporator coil temperatures.

Auto Mode Selection Logic

How the auto mode selects between cooling, heating, or fan only.

Special Operational Features

Forced Operation Modes

Controls for forcing specific operation modes.

Auto-Restart Functionality

Automatic restart feature after power interruption.

Refrigerant Leakage Detection

System for detecting refrigerant leaks.

Louver Position Memory

Feature to memorize the louver's last position.

8°C Heating Operation

Specifics of heating operation at 8°C.

Silence Operation Mode

Mode for reduced noise operation.

Inquiry Mode Operations

Inquiry Mode Entry and Navigation

How to enter and navigate the inquiry mode.

Troubleshooting Safety Precautions

Capacitor Discharge Warning

Caution about residual electricity in capacitors.

Indoor Unit Diagnostic Codes

Outdoor Unit Error Code Diagnostics

Error Codes for 9K-18K Models

Diagnostic table for unit sizes 9K-18K.

Error Codes for 24K-36K Models

Diagnostic table for unit sizes 24K-36K.

EEPROM Parameter Error (EC51)

EC51 Error Troubleshooting Steps

Outdoor PCB EEPROM or compressor chip feedback error.

Communication Error (EL01)

EL01 Error Troubleshooting Steps

Indoor unit cannot communicate with the outdoor unit.

Electrical Component Testing Procedures

DC Voltage Measurement Guide

How to test DC voltage between outdoor unit ports.

Reactor Resistance Measurement Guide

How to test reactor resistance.

Zero Crossing Detection Error (EH02)

EH02 Error Troubleshooting Steps

PCB not receiving zero crossing signal feedback.

Indoor Fan Speed Error (EH03)

EH03 Error Troubleshooting Steps

Indoor fan speed too slow or too fast.

Outdoor Fan Speed Error (EC07)

EC07 Error Troubleshooting Steps

Outdoor fan speed too low or too high.

Outdoor DC Fan Motor Diagnosis

DC Fan Motor Testing Procedures

How to test the outdoor DC fan motor.

Indoor Temperature Sensor Error (EH60)

EH60 Error Troubleshooting Steps

Indoor temperature sensor open circuit or short circuit.

Outdoor Temperature Sensor Error (EC53)

EC53 Error Troubleshooting Steps

Outdoor temperature sensor open circuit or short circuit.

Refrigerant Leakage Detection (EL0C)

EL0C Error Troubleshooting Steps

Detection of refrigerant leakage.

PCB Communication Error (EH06)

EH06 Error Troubleshooting Steps

Indoor PCB does not receive feedback from display board.

Current Overload Protection (PC08)

PC08 Error Troubleshooting Steps

Abnormal current rise detection.

IPM/IGBT Over-Current Protection (PC00)

PC00 Error Troubleshooting Steps

IPM sends abnormal voltage to compressor drive chip.

IPM Continuity Testing

Compressor Resistance Check

Over/Low Voltage Protection (PC01)

PC01 Error Troubleshooting Steps

Abnormal voltage increase or decrease.

IPM Module Protection (PC02)

PC02 Error Troubleshooting Steps

IPM module temp/pressure protection.

Low Pressure Protection (PC03)

PC03 Error Troubleshooting Steps

Outdoor pressure switch shuts unit down due to low pressure.

Inverter Compressor Drive Error (PC04)

PC04 Error Troubleshooting Steps

Abnormal inverter compressor drive detected.

Multi-Unit Mode Conflict

Mode Conflict Rules

Rules for conflicts in multi-unit systems.

Appendices and Reference Data

Temperature Sensor Resistance Table (T1-T4)

Resistance values for temperature sensors T1-T4.

Temperature Sensor Resistance Table (T5)

Resistance values for temperature sensor T5.

Temperature Conversion Formula

Formula for converting Fahrenheit to Celsius.

IPM Continuity Test Procedure

Procedure for checking IPM continuity.

Disassembly Instructions

Front Panel Removal

Steps to remove the front panel.

Panel Frame Removal

Steps to remove the panel frame assembly.

Bottom Panel & Support Bar Removal

Steps to remove bottom panel and support bar.

Display Board Removal

Steps to remove the display board.

Electrical Control Box Cover Removal

Steps to open and secure the electrical control box cover.

Main Control Board Removal

Steps to disconnect wires and remove the main control board.

Electrical Control Box Assembly Removal

Steps to remove the electrical control box assembly.

Evaporator Removal Steps

Steps to remove the evaporator assembly.

Evaporator Screw Removal

Steps to remove screws securing the evaporator.

Fan Motor and Fan Removal

Steps to remove the fan motor and fan assembly.

Fan Motor Bearing Sleeve Removal

Steps to remove bearing sleeve and fan assembly.