Brink Flair 325/400
Controls Brink Flair 325/400 recuperation units via Modbus
Modbus template for Brink Flair 325 and Brink Flair 400 heat recovery ventilation units. Reads air pressures, temperatures, CO2 levels, filter and bypass status. Also provides control of airflow, bypass mode, and imbalance settings via Modbus RTU.
- Protocol
- Modbus RTU
- Connection
- RS485
- Registers
- 30, read and write
- Brand
- Brink
- Key readings
- Supply and exhaust air pressure · Supply and exhaust air setpoint/actual · Temperature sensors (supply, exhaust, NTC1) · CO2 sensors 1 to 4 · Bypass and preheater status · Filter status
- Available commands
- Bypass mode · Desired throughput setting · Imbalance offset (supply/exhaust) · Reset filter warning / device
- Compatible models
- Brink Flair 325 · Brink Flair 400
- Last updated
Registers (30)
30 read, 9 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| Device type | Read | ||||
| Serial number - part1 | Read | ||||
| Serial number - part2 | Read | ||||
| Serial number - part3 | Read | ||||
| Actual supply air pressure | Pa | Read | |||
| Actual exhaust air pressure | Pa | Read | |||
| Supply air setpoint | Pa | Read | |||
| Actual value supply air | Pa | Read | |||
| Temperature sensor - supply fan | °C | Read | |||
| Exhaust air setpoint | Pa | Read | |||
| Actual value exhaust air | Pa | Read | |||
| Temperature sensor - exhaust fan | °C | Read | |||
| Bypass status | Read | ||||
| Preheater status | Read | ||||
| Preheater power | W | Read | |||
| Temperature NTC1 | °C | Read | |||
| Filter status | Read | ||||
| CO2 - sensor 1 | ppm | Read | |||
| CO2 - sensor 2 | ppm | Read | |||
| CO2 - sensor 3 | ppm | Read | |||
| CO2 - sensor 4 | ppm | Read | |||
| Bypass mode | Read and write | ||||
| Change proposal - switch position | Read and write | ||||
| Desired throughput setting | % | Read and write | |||
| Imbalance allowed | % | Read and write | |||
| ModBus control switch | Read and write | ||||
| Offset imbalance exhaust air | Pa | Read and write | |||
| Offset imbalance supply air | Pa | Read and write | |||
| Reset filter warning | Read and write | ||||
| Reset the device | Read and write |
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Use cases
- Monitor supply and exhaust air temperatures and pressures on a live cloud dashboard for remote commissioning.
- Create an alert when the filter status indicates a clogged filter so the end user can replace it promptly.
- Adjust airflow throughput and imbalance offset remotely to fine-tune ventilation balance after installation.
- Track CO2 sensor readings over time to verify indoor air quality meets building regulations.
- Receive a notification when bypass status changes unexpectedly, indicating potential mechanical issues.
- Reset filter warnings remotely without dispatching a technician to the site.
Installation
Connect the Modbus RTU interface of the Brink Flair 325 or 400 to the RS-485 port on your ModbusCloud Gateway, using the A, B, and GND terminals.
Verify that the baud rate and parity settings on the gateway match the Brink unit defaults as documented in the Brink Modbus specification.
Set a unique Modbus slave address on the Brink unit if multiple devices share the same RS-485 bus.
Import the Brink Flair 325/400 template from the ModbusCloud template library and assign it to the correct gateway and slave address.
Confirm that temperature readings display correctly, including negative values, to verify that signed int16 interpretation is active.
Check that writable registers such as desired throughput and bypass mode respond as expected by adjusting a value and observing the unit.
Things to watch for
Why do temperature readings show unusually high values instead of negative temperatures?
Temperature registers use signed 16-bit integers (int16). If the template or gateway interprets them as unsigned, sub-zero values will appear as large positive numbers. Make sure the register data type is set to int16.
What baud rate and parity should I configure on the gateway?
Consult the Brink Modbus documentation for the factory default communication settings. Common defaults for Brink units are 9600 baud, 8 data bits, no parity, and 1 stop bit, but verify against your specific unit and firmware version.
Can I use this template with other Brink recuperation models?
The template may partially work with other Brink recuperation units that have a Modbus interface, since many registers overlap. However, full compatibility is only confirmed for the Flair 325 and Flair 400.
How do I connect the Brink unit to ModbusCloud if it only supports Modbus RTU?
Use the ModbusCloud Gateway with an RS-485 port. The gateway bridges Modbus RTU to TCP and forwards data to the ModbusCloud platform over the internet.
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