Bosch BMS500-AAU036-1AHCXC 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-AAU036-1AHCXC Specifications

General

Brand	Bosch
Model	BMS500-AAU036-1AHCXC
Category	Air Conditioner
Language	English

Summary

Key to Symbols and Safety Instructions

Safety Precautions

Details essential safety warnings and precautions before installation and operation.

Refrigerant Cycle Diagrams

Wiring Diagrams

Installation Details

Torque Requirements

Connecting the Cables

Pipe Length and Elevation Limits

First Time Installation Procedures

Adding Refrigerant to Existing System

Collecting Refrigerant into Outdoor Unit

Evacuation of Refrigeration Circuit

Electronic Functions

Main Protection Overview

Compressor Restart Delay

Details the delay time for compressor restarts after shutdown.

Compressor Discharge Temperature Protection

Explains how compressor discharge temperature affects operation and protection.

Fan Speed Malfunction

Describes the protection triggered by abnormal outdoor fan speeds.

Inverter Module Protection

Details protection features for the inverter module against faults.

Low Voltage Protection

Explains the low voltage protection mechanism and its behavior.

Compressor Current Limit Protection

Describes how compressor current limits are adjusted based on temperature.

Indoor / Outdoor Units Communication Protection

Details the protection triggered by loss of communication between units.

High Condenser Coil Temperature Protection

Explains protection related to high condenser coil temperatures.

Capacity Request Calculation

Defrost Control Logic

Outdoor Fan Control Logic

Electronic Expansion Valve (EXV) Operation

Four-Way Valve Control Logic

Point Check Function (Troubleshooting Mode)

Troubleshooting Guide

Electrical Hazard Safety

Warning regarding electrical hazards, especially capacitors, during troubleshooting.

Outdoor Unit Error Codes

Lists and explains various error codes (EC, EL, PC) for the outdoor unit.

Quick Check by Error Codes

Provides a table linking error codes to potential causes for quick diagnosis.

Diagnosis and Solution

EEPROM Parameter Error (EC 51)

Troubleshooting steps for EEPROM communication errors between PCB chips.

Indoor/Outdoor Communication Error (EL 01)

Diagnostic flow for errors related to communication between indoor and outdoor units.

IPM Board Communication Error (PC 40)

Troubleshooting for communication malfunctions between IPM and main control boards.

Sensor Malfunction Troubleshooting (EC 52-56, EC 50)

Diagnosing issues with temperature sensors (T2B, T3, T4, T5) and connections.

Over/Under Voltage Protection (PC 10, 11, 12)

Troubleshooting steps for voltage protection errors related to power supply and IPM.

PFC Module Protection Error (PC 0F)

Diagnostic procedure for PFC module protection errors and related components.

Outdoor Fan Speed Malfunction (EC 07/EC 71)

Troubleshooting for issues with outdoor DC fan motor speed control.

High Pressure Protection (PC 30)

Diagnostic steps for high pressure protection errors and related causes.

Low Pressure Protection (PC 31)

Troubleshooting guide for low pressure protection errors and system checks.

Current Overload & Speed Issues (PC 08, 44, 46, 49)

Diagnosing problems related to current overload, zero speed, and compressor speed.

Compressor Discharge Temperature Protection (PC 06)

Troubleshooting steps for compressor discharge temperature protection errors.

High Condenser Temperature Protection (PC 0A)

Diagnostic procedure for high condenser temperature protection.

Inverter Module (IPM) Malfunction (P6)

Troubleshooting for inverter module malfunctions affecting compressor drive.

Compressor Top Temperature Protection (PC 02)

Diagnostic steps for high temperature protection errors on the compressor top.

Fan Motor Phase Failure (EC 72)

Troubleshooting for lack of phase failure in the outdoor DC fan motor.

Compressor Lack Phase Protection (PC 43)

Outdoor Unit IR Chip Drive Failure (PC 45)

Communication Malfunction (Adapter & Main Board)

Compressor Check

IPM Continuity Check

Four-Way Valve Check

EXV Check

Disassembly Guide