This reference chart outlines configurable function codes and options for Fujitsu General VRF indoor units, covering Ducted, Cassette, Ceiling, Wall-Mounted, and Floor Console types.
Purpose
The chart identifies function number settings, default configurations, and adjustable parameters used to customize indoor unit performance based on installation and application requirements.
Key Configuration Categories
Airflow and Fan Control
High ceiling and static pressure modes adjustable by DIP or function setting.
Multiple fan speed selections (Low / Medium / High).
External static pressure mode for ducted systems.
Thermostat & Sensor Operation
Room temperature sensing from main PCB, wired controller, or remote sensor.
Control logic can be adjusted depending on installation type (ceiling, cassette, duct).
Remote Controller Functions
Optional lockout of specific functions (e.g., temperature range limit, mode restriction).
Group control compatibility defined by function codes.
Auxiliary and External Controls
External ON/OFF, dry contact, and external fan operation supported.
Humidifier control and fresh air intake connection points available for certain models.
Operational Modes
Auto restart, high ceiling, and cool air prevention modes configurable.
Default mode differs by model (factory preset noted).
Maintenance & Special Features
Filter sign, thermostat control precision, and energy-saving settings (e.g., setback mode).
Some functions exclusive to specific indoor unit models (highlighted in yellow/orange).
Highlighted Compatibility
Blue Fields: Standard function options across most VRF indoor units.
Yellow Fields: Optional or model-specific configurable functions.
Orange Notes: Functions not applicable to certain indoor types (e.g., discharge ducts).
Commissioning Notes
Adjust function codes via wired controller (Function Mode).
Record changes in commissioning sheets for traceability.
Confirm compatibility with corresponding system controller and outdoor unit series before modification.
