Overview
The External Input Functions of Fujitsu General’s VRF system provide enhanced functionality and control options for various operational scenarios. These inputs allow seamless integration with external devices such as sensors, switches, and controllers to optimize energy savings, centralized control, and operational efficiency.
Key Features of External Input Functions
Energy-Saving Integration:
Automatically manage system operation based on external triggers like occupancy sensors, keycards, or other devices.
Customizable Operations:
Enable or disable specific functions like batch stop, automatic shutdown, or operational interlocks with other systems.
Remote Control Compatibility:
Works in sync with external switches or centralized control systems to provide comprehensive control over the VRF units.
Enhanced Functionality:
External inputs can trigger energy-saving modes, ventilation interlocks, and emergency stops.
Common Use Cases
Hotels and Hospitality:
Use keycard interlocks to ensure air conditioning turns off when rooms are unoccupied, reducing energy consumption.
Office Buildings:
Integrate motion or occupancy sensors to control air conditioning based on room usage.
Factories and Large Facilities:
Implement batch stop functions for synchronized shutdown of multiple units in emergencies.
External Input Functions 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 instantly in emergencies using an external trigger. |
| Ventilation Interlock | Links the VRF system with external ventilation systems for coordinated operation. |
Setting Up External Input Functions
Install External Connection Kit:
Ensure the optional external connection kit (e.g., UTY-XWZXZD) is installed on the VRF system.
Connect External Devices:
Use the provided terminals on the indoor or outdoor unit PCB.
Ensure wiring complies with the specified guidelines (e.g., AWG 22-20).
Set Function Parameters:
Access the function settings through the remote controller or centralized control panel.
Input the corresponding Function No. and Setting No. (e.g., for Forced Stop, Function No. 46, Setting No. 00).
Test the Configuration:
Simulate external triggers (e.g., insert/remove a keycard or activate a switch) to verify the system responds as expected.
