General Assist Technical Reference

VRF Indoor Unit Function Settings

Configuration categories, compatibility indicators and commissioning guidance
Applies to Fujitsu General VRF ducted, cassette, ceiling, wall-mounted and floor console indoor units.
This reference chart outlines configurable function codes and options for Fujitsu General VRF indoor units. It identifies function number settings, factory defaults and adjustable parameters used to tailor indoor unit operation to the installation and application.
Important: Available settings vary by indoor unit model, controller and outdoor unit series. Confirm compatibility in the applicable installation or service documentation before changing any function setting.

1. Key configuration categories

CategoryFunctions covered
Airflow and fan control
  • High-ceiling and static-pressure modes adjusted by DIP switch or function setting.
  • Low, medium and high fan-speed selections.
  • External static-pressure configuration for ducted systems.
Thermostat and sensor operation
  • Room-temperature sensing from the indoor unit main PCB, wired controller or remote sensor.
  • Control logic adjusted for ceiling, cassette or ducted installation types.
Remote controller functions
  • Restriction or lockout of selected functions, including temperature-range and operating-mode limits.
  • Group-control compatibility defined by function codes.
Auxiliary and external controls
  • External ON/OFF, dry-contact and external-fan operation.
  • Humidifier control and fresh-air intake connections on applicable models.
Operational modes
  • Auto restart, high-ceiling and cool-air prevention modes.
  • Factory default operating modes, which differ by model.
Maintenance and special features
  • Filter-sign timing, thermostat-control precision and energy-saving settings such as setback mode.
  • Model-specific functions identified by highlighted fields or notes.

2. Highlighted compatibility

Blue fieldsStandard function options available across most VRF indoor units.
Yellow fieldsOptional or model-specific configurable functions.
Orange notesFunctions that are not applicable to particular indoor unit types, including some discharge-duct arrangements.

3. Commissioning guidance

  1. Confirm the exact indoor unit model. Do not assume that a function shown for one indoor type is available on every model.
  2. Check controller access. Function codes are normally adjusted through the wired controller's Function Mode.
  3. Verify system compatibility. Confirm the corresponding system controller and outdoor unit series before making changes.
  4. Record every change. Enter the original and revised settings on the commissioning sheet for traceability.
  5. Test operation. Confirm that the indoor unit responds as intended after the setting has been changed.
Recommended record: Indoor model, address, function number, original setting value, revised setting value, reason for change, date and technician name.

4. Function settings reference chart

Use the chart below to identify available function numbers, factory defaults and model-specific options.

Fujitsu General VRF indoor unit function settings reference chart
Reading the chart: Locate the indoor unit type, identify the required function number, confirm the factory default and then select only an option shown as applicable to that model.
This article is a general reference. Always use the installation and service documentation applicable to the exact indoor unit and VRF system series.