Bosch BMS500-AAU024-1AHDXB User Manual

Service Manual
Ductless Air Conditioner / Heat Pump
Multi Zone Outdoor Units
Climate 5000 Series
BTC 769102304 A / 01.2023
WARNING:
f Installation must be performed by a licensed
contractor, and per the instructions in the
installation manual. Improper installation can
cause water leakage, electrical shock, or fire.
f In North America, installation must
be performed in accordance with the
requirement of NEC (National Electric Code)
and CEC (Canadian Electric Code) by licensed
and qualified personnel only.
f Only contact a licensed contractor for repair
or maintenance of this unit.

Bosch BMS500-AAU024-1AHDXB Specifications

General

Brand	Bosch
Model	BMS500-AAU024-1AHDXB
Category	Air Conditioner
Language	English

Summary

Symbols and Safety

Safety Precautions

Important safety precautions before installation and general warnings.

Outdoor Refrigerant Cycle Diagrams

Wiring Diagrams

Installation Details

Initial System Installation

Step-by-step guide for initial air purging with a vacuum pump.

Refrigerant Charging Procedure

Procedure for adding refrigerant to an existing system, including cautions.

Refrigerant Recovery to Outdoor Unit

Refrigeration Circuit Evacuation

Electronic Functions

System Protection Features

Describes various protection functions like compressor restart delay and temperature limits.

System Operating Logic

EXV Operation and Control

Troubleshooting Guide

Outdoor Unit Error Codes

Lists all error codes for the outdoor unit and their LED status.

Error Code Cause Checklist

Provides a table to quickly check potential causes for specific error codes.

Outdoor PCB and IPM Details

Error Code Diagnosis and Solutions

Provides troubleshooting steps for specific error codes like EEPROM parameter error (EC 51).

Indoor/Outdoor Communication Error

Troubleshooting flowchart for indoor/outdoor communication errors.

IPM to Main Board Communication Error

Troubleshooting steps for communication errors between IPM and main control boards.

Outdoor Sensor Malfunction Errors

Troubleshooting for outdoor sensor malfunctions (T3, T4, T5, T2B).

Voltage Protection Errors

Troubleshooting for over/under voltage protection errors.

PFC Module Protection Troubleshooting

Outdoor Fan Speed and Current Errors

Troubleshooting for outdoor fan speed and overcurrent failures.

High Pressure Protection Troubleshooting

Troubleshooting for high-pressure protection errors.

Low Pressure Protection Troubleshooting

Troubleshooting for low-pressure protection errors.

Current Overload and Compressor Speed Issues

Troubleshooting for current overload and compressor speed issues.

Compressor Discharge Temperature Protection

Troubleshooting for compressor discharge temperature protection.

Condenser High Temperature Protection

Troubleshooting for high condenser temperature protection.

IPM Module Malfunction Troubleshooting

Troubleshooting for inverter module (IPM) malfunctions.

Compressor Top Temperature Protection

Troubleshooting for high compressor top temperature protection.

Outdoor DC Fan Phase Failure

Compressor Lack Phase Protection

IR Chip Drive Failure Troubleshooting

Adapter Board Communication Malfunction

Component Disassembly Procedures

Disassembly: BMS500-AAM018-1CSXRC Outdoor Unit

Disassembly: BMS500-AAM027 Series Outdoor Units

Disassembly: BMS500-AAM036/048 Series Outdoor Units