Airnexus Core Controller –
The Brain of Modern HVAC Automation
Introduction
The Airnexus Core Controller is the central intelligence of the Airnexus ecosystem — the control hub that links all modules, HVAC units, and field sensors into a unified automation platform. It’s engineered to manage and optimize modern residential and commercial HVAC and hydronic systems, combining flexibility, expandability, and local autonomy.
Architecture Overview
At the heart of the system, the Airnexus Core acts as the bridge between the field devices, control network, and user interfaces.
Supported Communication Interfaces
- Ethernet – for local and remote access
- ANX Bus – Airnexus proprietary expansion bus
- RS-485 – for third-party or legacy integrations
This allows the Core to communicate simultaneously with expansion modules, sensors, thermostats, and external automation systems.
Key Features
| Feature | Description | Use Case / Importance |
| Built-in Automation Logic | Hosts custom control logic and automation routines directly on the Core. | Enables scheduling, interlocks, and system logic without cloud dependency. |
| Local Web Server | Operates offline via local network. | Reliable control even when internet is down. |
| Modular Expansion | Supports additional zoning, hydronic, and sensor modules through ANX Bus. | Scales with building size and complexity. |
| Third-Party Device Integration | RS-485 allows linking to non-Airnexus HVAC devices or sensors. | Integrates legacy systems easily. |
| Control4 Compatibility | Includes a dedicated Control4 driver (ANX-DRIVER-C4). | Enables integration with home automation ecosystems. |
| Installer-Focused Tools | Designed for HVAC and BMS professionals with diagnostic visibility. | Simplifies commissioning and troubleshooting. |
System Placement
The Core fits within a five-layer ecosystem:
- Field Layer – sensors, thermostats, FCUs, hydronic valves.
- Bus Layer – ANX Bus and RS-485 for communication.
- Core Layer – Airnexus Core for processing, automation, and logic.
- Interface Layer – SmartSense displays, mobile apps, or web dashboard.
- Remote Layer – optional remote access, monitoring, or partner integration.
Advantages
- Centralized control of multiple HVAC and hydronic systems
- Scalable architecture – expand zones or modules without rewiring the network
- True local operation – not cloud-dependent for daily control
- Seamless integration with third-party automation systems
- Professional-grade reliability and diagnostic visibility
Limitations & Considerations
- Requires technical setup knowledge (bus wiring, addressing, logic configuration)
- Ensure proper RS-485 termination and ANX Bus topology for stability
- Dependent on firmware compatibility between modules
- Recommended to maintain periodic configuration backups
Applications
- Zoned VRF/VRV air conditioning systems
- Mixed HVAC and hydronic systems
- Smart home and building management integrations
- Energy optimization projects
- Retrofit sites integrating legacy HVAC units
Typical Installation Tips
- Plan Bus Topology Carefully – observe cable lengths and terminations.
- Leave Headroom for Expansion – avoid running at full capacity from day one.
- Secure Configuration Backups – safeguard against data loss or hardware failure.
- Keep Firmware Updated – ensures stability and access to new features.
- Test All Zones Locally before commissioning cloud or automation control.
Technical Overview
- Connectivity: Ethernet, RS-485, ANX Bus
- Control Protocols: Supports Airnexus proprietary protocol, Modbus, and compatible third-party drivers
- Operating Mode: Local server with optional cloud connectivity
- Power Input: 24 V AC or DC (depending on variant)
- Dimensions: DIN-rail mounted compact enclosure