General Assist Technical Reference
VRF External Output Specifications
Quick Answer
Fujitsu General VRF indoor and outdoor units can provide external outputs for functions such as operation status, error status, filter indication, auxiliary heater control and base heater control. Available terminals, output type and wiring limits vary by model.
Fujitsu General VRF indoor and outdoor units can provide external outputs for functions such as operation status, error status, filter indication, auxiliary heater control and base heater control. Available terminals, output type and wiring limits vary by model.
Important
Confirm the exact service or installation manual for the connected model before wiring. Terminal numbers and supported output functions vary between product series.
Confirm the exact service or installation manual for the connected model before wiring. Terminal numbers and supported output functions vary between product series.
1. Overview
This reference outlines the external output specifications used across Fujitsu General VRF indoor and outdoor units, including compact cassette, ducted, ceiling, wall-mounted and controller types.
External outputs can be used for system integration, remote monitoring, alarms and auxiliary equipment control.
2. Functions Supported
- Operation Status Output
- Error Status Output
- Filter Sign Output
- Auxiliary Heater Output
- Base Heater Output
Depending on the model and configuration, these functions may use either a dry contact output or an applied voltage output.
3. Electrical Characteristics
| Output Type | Signal Voltage | Allowable Current | Remarks |
|---|---|---|---|
| Dry Contact | DC 12–24 V | 30 mA or less | Signal-only circuits |
| Applied Voltage | DC 12–24 V | 30 mA or less | Requires external power supply |
4. Wiring and Connector Information
| Typical Terminal Locations | D91/92, D101/102, D121/122, or equivalent depending on model series |
| Recommended Cable | AWG22 twisted pair, approximately 0.32 mm² |
| Maximum Length – Dry Contact | 25 m or less |
| Maximum Length – Applied Voltage | 150 m or less |
Auxiliary Heater Output
Where specified for the applicable model, set DIP switch SW12-9 to ON when using the auxiliary heater output.
Where specified for the applicable model, set DIP switch SW12-9 to ON when using the auxiliary heater output.
5. Applicable Model Groups
- Ceiling Cassette: AUUB / AUUBG / AURB series
- Ducted: ARUB / ARUBG / ARUBL / ARXB series
- Slim Duct and Low Static Duct units
- Medium and High Static Duct units
- Ceiling, Compact and Wall-Mounted units
- Outdoor Units: VRF-J, J-II, V-II and VR-II
- Central Controllers: UTY-ODGX and UTY-VGGX series
6. Typical Applications
External outputs can be used to:
- Interface with a Building Management System (BMS) for operation monitoring.
- Trigger external alarms or indicator lamps when a fault occurs.
- Control auxiliary heaters or ventilation equipment based on system status.
Protect the PCB
Ensure all external devices remain within the specified current and voltage limits. Where a load exceeds the output rating, use an appropriate interposing relay or interface rather than driving the load directly from the PCB output.
Ensure all external devices remain within the specified current and voltage limits. Where a load exceeds the output rating, use an appropriate interposing relay or interface rather than driving the load directly from the PCB output.
7. Reference Chart
The original Freshdesk-hosted reference chart is retained below for detailed model-by-model terminal and function information.
