AIRSTAGE Technical Reference
External Input Functions
VRF external control, interlock and energy-saving integration
For Fujitsu General VRF systems using external input control functions
The External Input Functions allow a Fujitsu General VRF system to respond to external devices such as switches, sensors, keycards and control systems. These inputs can be used for energy-saving operation, coordinated control and operational interlocks.
1. Key features
| Feature | Description |
|---|---|
| Energy-saving integration | Allows system operation to respond to external triggers such as occupancy sensors, keycards or other devices. |
| Customisable operation | Can support functions such as batch stop, automatic shutdown and operational interlocks with other systems. |
| External control compatibility | Can operate with external switches or centralised control systems to provide broader VRF control. |
| Extended functionality | External inputs can be used to trigger energy-saving modes, ventilation interlocks and emergency stop functions. |
2. Common use cases
Hotels and hospitality
Use keycard interlocks so air conditioning can be turned off when a room is unoccupied, helping reduce unnecessary energy consumption.
Use keycard interlocks so air conditioning can be turned off when a room is unoccupied, helping reduce unnecessary energy consumption.
Office buildings
Integrate motion or occupancy sensors to control air conditioning based on room usage.
Integrate motion or occupancy sensors to control air conditioning based on room usage.
Factories and large facilities
Use batch stop functions to synchronise shutdown of multiple units when required.
Use batch stop functions to synchronise shutdown of multiple units when required.
3. External input function overview
| Function | Description |
|---|---|
| Keycard Interlock | Automatically turns the air conditioner on or off based on keycard insertion. |
| Batch Stop | Shuts down multiple units simultaneously via an external switch. |
| Automatic Off Function | Turns the system off automatically after a preset duration of inactivity. |
| Emergency Stop | Stops all units using an external emergency trigger. |
| Ventilation Interlock | Links the VRF system with an external ventilation system for coordinated operation. |
4. Setting up external input functions
- Install the external connection kit.
Ensure the required optional external connection kit is installed, for example UTY-XWZXZD. - Connect the external device.
Use the applicable terminals on the indoor or outdoor unit PCB. Wiring should comply with the specified requirements; the supplied guidance references AWG 22-20. - Configure the function parameters.
Access the function settings through the remote controller or centralised control panel and enter the applicable Function No. and Setting No. - Test the configuration.
Simulate the external trigger, such as inserting or removing a keycard or operating the external switch, and confirm that the VRF system responds as intended.
Example function setting: The supplied reference identifies Forced Stop as Function No. 46 / Setting No. 00. Confirm the required function and setting against the applicable product documentation before commissioning.
Important: External input availability, terminals, wiring requirements and function settings can vary by model and system configuration. Use the relevant installation or service documentation for the equipment being configured.
5. Reference images
