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Mitsubishi FDC 6 Series - User Manual

Mitsubishi FDC 6 Series
34 pages
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This guide is to assist
site service engineers
with commissioning
of systems and to
provide information
for maintenance and
fault finding.
Including outdoor unit (FDC 6 Series and 8 Series)
AIR CONDITIONING & HEAT PUMP SYSTEMS
SERVICE GUIDE
FDT 4-Way Cassette
FDEN Ceiling Suspended
FDKN Wall Mounted
FDR Ducted Cassette
FDU Ducted - High Static

Table of Contents

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Mitsubishi FDC 6 Series Specifications

General IconGeneral
BrandMitsubishi
ModelFDC 6 Series
CategoryAir Conditioner
LanguageEnglish

Summary

8.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER

Wireless Remote Controller Operation

Details operation control for wireless remote controllers, including functions and indicators.

Wired Remote Controller Operation

Details operation control for wired remote controllers.

Microcomputer Control Functions

Indoor Controller Operation Control

Details operation control managed by the indoor controller for various modes.

Outdoor Controller Operation Control

Details operation control managed by the outdoor controller for fan and defrost functions.

Wired Remote Controller Operation Details

Operation Control Sequence and Reset Functions

Explains operation sequences, CPU reset, and power outage compensation.

Remote Controller PCB Layout and Configuration

Details PCB layout, DIP switches, and jumper wire functions for configuration.

Specific Unit Control and Protection

Outdoor Unit Fan Control

Controls outdoor unit fan speed based on temperatures during cooling and heating.

Outdoor Unit Defrost and Temperature Control

Manages de-icing, discharge temperature, and defrost operations.

Compressor Protection and Safety

Compressor Protection Mechanisms

Covers overcurrent, open-phase, temperature, and overload protection for the compressor.

High-Pressure and Motor Protection

Explains high-pressure protection, compressor motor protection, and test run procedures.

Safety Precautions and Maintenance

Installation Safety Precautions

Provides critical warnings and precautions for safe equipment installation.

Servicing and Refrigerant Handling

Details procedures for evacuation, refrigerant charging, and troubleshooting.

Fault Diagnosis and Troubleshooting

Microcomputer Circuit Failure Diagnosis

Explains diagnosis methods for microcomputer circuit failures using indicators and error codes.

Outdoor Unit Fault Diagnosis

Outdoor Unit Fault Indicator Interpretation

Details interpretation of fault indicators on the outdoor unit PCB.

Thermistor Fault Diagnosis

Outdoor Temperature Thermistor Faults

Details the diagnosis for a defective outdoor temperature thermistor.

Discharge Gas Thermistor Faults

Covers the diagnosis for a defective discharge gas thermistor.

High Pressure and Service Valve Faults

High Pressure Error Diagnosis

Diagnoses high pressure errors related to 63H1 and 49C.

Service Valve Opening Failure Diagnosis

Covers the diagnosis for failure to open the service valve.

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