Carrier 40MAHBQ36XA3 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 40MAHBQ36XA3 Specifications

General

Brand	Carrier
Model	40MAHBQ36XA3
Category	Air Conditioner
Language	English

Summary

INTRODUCTION

MODEL / SERIAL NUMBER NOMENCLATURES

SPECIFICATIONS

COMPATIBILITY

Lists compatible indoor units with specific outdoor units (single zone and multi-zone).

DIMENSIONS

CLEARANCES

Illustrates required clearances for ceiling and floor installations.

ELECTRICAL DATA

WIRING

Provides guidelines for wiring, including wire sizing and connection methods.

CONNECTION DIAGRAMS

WIRING DIAGRAM

REFRIGERATION CYCLE DIAGRAM

REFRIGERANT LINES

Important note regarding the insulation of refrigerant lines.

FAN AND MOTOR SPECIFICATIONS

SYSTEM EVACUATION AND CHARGING

Deep Vacuum Method

Requires a pump capable of 500 microns and a gauge for measuring vacuum depth.

Triple Evacuation Method

A multi-step process involving evacuation and nitrogen purging to remove contaminants.

Final Tubing Check

Ensure factory tubing is secure and not rubbing against any metal.

Main Protection

Fan speed is out of control

Unit stops if indoor fan speed is too low or too high for a period.

Inverter module protection

Protects against current, voltage, and temperature issues for the inverter module.

Indoor fan delayed open function

Indoor fan starts 10s after louver activation upon unit startup.

Zero crossing detection error protection

Detects incorrect zero crossing signal intervals, causing the unit to stop.

Sensor protection at open circuit and breaking disconnection

Protects against sensor malfunctions like open circuits or disconnections.

Operation Modes and Functions

FAN Mode

Outdoor fan and compressor stop; temperature setting disabled.

COOLING Mode

Describes indoor fan running rules in COOLING mode based on temperature.

Evaporator Temperature Protection

Compressor stops if evaporator temperature is less than the set value.

HEATING Mode

DEFROSTING Mode

Describes the DEFROSTING mode activation, compressor and motor behavior.

AUTO Mode

Allows choosing between COOLING, HEATING, or FAN ONLY based on temperature difference.

DRYING Mode

Specifies fixed indoor fan speed (BREEZE) and low room temperature protection.

Evaporator Anti-Freezing Protection

Outdoor Fan

Explains that the outdoor fan operates the same as in COOLING mode.

Forced OPERATION Function

Forced OPERATION Mode

General protections and remote controller are available in this mode.

Forced COOLING Mode

Compressor runs at F2 frequency, indoor fan in BREEZE mode.

Forced AUTO Mode

Functions like normal AUTO mode with a fixed temperature.

Forced DEFROSTING Mode

How to enter and exit the forced defrosting mode.

AUTO-RESTART Function

Refrigerant Leakage Detection

Louver Position Memory Function

46°F (8°C) Heating

Silence Operation

Point Check Function

Information Enquiry

TROUBLESHOOTING

Safety

Emphasizes the need to discharge electricity from capacitors before servicing.

INDOOR UNIT DIAGNOSTIC GUIDE

DIAGNOSIS AND SOLUTION

EEPROM Parameter Error Diagnosis and Solution (E0/F4)

Details malfunction conditions, causes, and troubleshooting for EEPROM errors.

Indoor / outdoor unit's communication diagnosis and solution (E1)

Addresses communication errors between indoor and outdoor units (E1).

Zero crossing detection error diagnosis and solution (E2)

Explains diagnosis and solutions for zero crossing detection errors (E2).

Fan speed has been out of control diagnosis and solution (E3/F5)

Provides diagnosis and solutions for fan speed out of control errors (E3/F5).

Indoor or Outdoor DC Fan Motor Diagnosis

Diagnoses issues with indoor/outdoor DC fan motors based on voltage measurements.

Outdoor DC Fan Motor Diagnosis

Diagnoses outdoor fan motor issues by checking resistance and PCB.

Indoor AC Fan Motor Diagnosis

Diagnoses indoor AC fan motor issues based on voltage measurements.

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

Details diagnosis and solutions for temperature sensor circuit errors (E4/E5/F1/F2/F3).

Refrigerant Leakage Detection Diagnosis and Solution (EC)

Explains diagnosis and solutions for refrigerant leakage detection (EC).

Overload Current Protection Diagnosis and Solution (F0)

Provides diagnosis and solutions for overload current protection (F0).

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

Explains diagnosis and solutions for IPM or IGBT over-current protection (P0).

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

Details diagnosis and solutions for over/under voltage protection (P1).

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

Explains diagnosis and solutions for high compressor temperature protection (P2).

Inverter Compressor Drive Error Diagnosis and Solution (P4)

Provides diagnosis and solutions for inverter compressor drive errors (P4).

Main Parts Check

Temperature Sensor Checking

Instructions on how to measure the resistance of temperature sensors with a tester.

APPENDICIES

Appendix 1

Provides a table of temperature sensor resistance values for T1, T2, T3, T4.

Appendix 2

Provides a table of temperature sensor resistance values for T5 (TP).

Appendix 3

Includes a table for temperature conversion and IPM continuity check.

IPM Continuity Check

Details how to check IPM continuity using a digital tester.

DISASSEMBLY INSTRUCTIONS

Front Panel

Instructions for removing the front panel and its components like the filter and louver.

Electrical parts (Anti-static gloves must be worn.)

Steps for accessing and removing electrical parts, emphasizing anti-static precautions.

Evaporator

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

Fan Motor and Fan

Steps to remove the fan motor and fan assembly.