Wiring & Connections
All wiring must be performed by a qualified technician with the power supply disconnected. Incorrect wiring may damage the Network Hub or connected devices.
Environmental Requirements
The Network Hub is designed for indoor use only, inside a dry electrical enclosure or junction box.
| Parameter | Specification |
|---|---|
| Operating temperature | 0 °C to 40 °C |
| Relative humidity | 20%–80% RH, non-condensing |
| Maximum altitude | 2000 m |
| Ingress protection | IP20 |
| Mounting | Fixed on 35 mm DIN rail |
Do not install in locations exposed to moisture, dripping water, or condensation.
Power Supply (12 Vdc)
Power the device at 12 Vdc using an external SELV (Safety Extra Low Voltage) power supply with:
- Double or reinforced insulation between mains and 12 Vdc output
- Overcurrent and short-circuit protection
- Stabilized 12 Vdc output
| Terminal | Connection |
|---|---|
| GND | Ground (−) |
| VCC | +12 Vdc (+) |
The power supply is not included. Using a non-SELV supply may create hazardous conditions.
When the Aquarea heat pump is connected via CN-CNT, the 12 Vdc supply is optional — the heat pump powers the hub.
Connecting the Aquarea Heat Pump (CN-CNT)
- Locate the CN-CNT connector on the Aquarea heat pump’s PCB.
- Use the supplied CN-CNT cable to connect the heat pump to the Network Hub’s CN-CNT port.
- Ensure the connector is firmly seated on both ends.
Only one Aquarea heat pump can be connected per Network Hub via CN-CNT.
Connecting Modbus Devices (RS-485)
The Network Hub provides two independent RS-485 serial buses (Serial 1 and Serial 2), supporting a combined total of up to 15 Modbus devices.
For each serial bus, connect to the three screw terminals:
| Terminal | Function |
|---|---|
| B | RS-485 Data − (inverting) |
| A | RS-485 Data + (non-inverting) |
| GND | Signal ground |
Wiring guidelines:
- Use a daisy-chain (bus) topology for all devices on a single bus.
- Use twisted-pair shielded cable for A/B data lines.
- Maximum recommended bus length: 100 m.
- Each device must have a unique Modbus address (1–15).
- Add a 120 Ω termination resistor between A and B at the last device if the run exceeds 50 m.
- Connect GND to provide a common reference between devices.
You can split devices across Serial 1 and Serial 2 (e.g. ground floor on Serial 1, first floor on Serial 2). Splitting devices across the two ports improves system responsiveness.
Network Connection (Ethernet)
- Connect a standard RJ-45 Ethernet cable from your router or switch to the Ethernet port.
- The Network Hub uses DHCP and obtains an IP address automatically. A static IP cannot be assigned.
A wired Ethernet connection is recommended for maximum reliability. Wi-Fi (2.4 GHz) can be configured during app setup.