The Johnson Controls FX03 (Model LP-FX03A11-0C) is a compact direct digital controller (DDC) from the Facility Explorer range. Designed for building automation systems (BAS), it controls HVAC terminal units such as fan coil units, heating/cooling coils, electric heaters, and multi-speed fans.

Key Features

Network & Protocols: Supports N2 Open and BACnet MS/TP communication protocols for seamless BAS integration.
Onboard Hardware Configuration: Integrated DIP switches allow manual setup for Net, Config, Address, and Room Mod. directly on the board.
Field Wiring Terminals: Removable green screw-terminal blocks for simple field installation and troubleshooting.
Power Supply: Operates on standard 24 VAC power supply.
Status LEDs: Onboard LED indicators display controller status and system diagnostic modes.

Technical Specifications

Specification	Details
Manufacturer	Johnson Controls
Series	Facility Explorer (FX03 Series)
Part Number	LP-FX03A11-0C
Application	Fan Coil Unit / Terminal Unit Controller
Power Supply	24 VAC
Mounting	DIN Rail or Surface Mounting
Terminal Connections	Screw-type terminal connectors

Terminal Connections Layout

DIP Switch Bank (Configuration):

Net: Network communication settings.
Config: Application configuration settings.
Address: Controller network address setup.
Room Mod.: Room Sensor / Interface Module connection mode.

Terminal Block Pins (Right Bank):

VSF, Com, DI1, DI2, DI3, DI4: Digital/Binary Inputs
Com, 15v, T1, T2, T3, T4: Temperature/Analog Sensor Inputs
Fan, S, SP, 15v, Com, 5v, Led, Occ: Fan Control, Power Outputs, and Occupancy Mode Terminals