AIRSTAGE VRF Technical Reference
Automatic Off Function
Energy-saving automatic shutdown for intermittently occupied spaces
Overview, applications, external input requirements and function setup
The Automatic Off Function in Fujitsu General VRF systems is designed to improve energy efficiency by automatically switching off the air conditioning system after a configured period of inactivity. This helps reduce unnecessary energy consumption in spaces with intermittent occupancy, including offices, conference rooms and hotel rooms.
1. Key features
| Feature | Description |
|---|---|
| Occupancy-based control | Uses external inputs, such as occupancy sensors or keycard systems, to monitor room usage. |
| Customisable timeout duration | Allows the inactivity duration to be configured before the system switches off automatically. |
| Energy savings | Helps prevent unnecessary energy use by shutting down the system when the space is unoccupied. |
| System-wide integration | Works with other VRF features, including keycard interlock and human sensor functions. |
2. Typical use cases
Hotel rooms
Automatically switches off air conditioning when a room is no longer occupied, including situations where a guest leaves without removing the keycard.
Automatically switches off air conditioning when a room is no longer occupied, including situations where a guest leaves without removing the keycard.
Conference rooms
Shuts down cooling or heating after meetings to help prevent unnecessary energy use.
Shuts down cooling or heating after meetings to help prevent unnecessary energy use.
Office spaces
Helps ensure unused areas are not unnecessarily cooled or heated after working hours.
Helps ensure unused areas are not unnecessarily cooled or heated after working hours.
3. Setting up the Automatic Off Function
| Step | Action | Details |
|---|---|---|
| 1 | Install the necessary hardware | Install and connect an external input device, such as an occupancy sensor or keycard system, to the VRF indoor unit using the applicable terminals and connection kit, for example UTY-XWZXZD. |
| 2 | Access function settings | Use the applicable remote controller or central control panel to access the function setup menu. |
| 3 | Set the function parameters | Enter the Function No. and Setting No. corresponding to the Automatic Off Function, then configure the required timeout duration. |
| 4 | Save and test the configuration | Confirm the settings and simulate inactivity, such as no movement being detected or the keycard being removed, to verify that the system switches off as expected. |
Function setting
Function No.: 46 (External Input Control)
Setting No.: Configure the required timeout duration, for example 15 minutes or 30 minutes.
Function No.: 46 (External Input Control)
Setting No.: Configure the required timeout duration, for example 15 minutes or 30 minutes.
Installation note: Confirm the applicable indoor-unit external input specifications, compatible connection kit and available function settings before wiring or commissioning. Requirements can vary by indoor unit and system configuration.
4. Reference image
