Komfovent DOMEKT C8

Use cases

• Monitor supply, extract, outdoor, and return air temperatures on a live dashboard for residential ventilation clients.
• Create alerts when filter impurity level exceeds a threshold so maintenance can be scheduled proactively.
• Adjust Away, Normal, Intensive, and Boost flow setpoints remotely to match seasonal occupancy patterns.
• Track active alarm counts and receive notifications when faults occur on the DOMEKT C8 unit.
• Switch between ECO, AUTO, and manual operating modes from the cloud without on-site intervention.
• Log humidity and fan intensity data over time to verify indoor air quality compliance.

Installation

1. 1Connect the ModbusCloud gateway (MCG or MLP series) to the same local network as the Komfovent DOMEKT C8, ensuring both devices can communicate over Modbus TCP on port 502.
2. 2Verify that Modbus TCP is enabled on the DOMEKT C8 control panel and note the unit's IP address and Modbus slave ID.
3. 3In the ModbusCloud portal, add a new device and import the Komfovent DOMEKT C8 template from the template library.
4. 4Enter the IP address and slave ID of the DOMEKT C8 in the device configuration screen.
5. 5Confirm that 32-bit flow setpoint registers (e.g. addresses 99, 101, 105, 107) are mapped as uint32 spanning two registers each, and that temperature registers are mapped as int16.
6. 6Verify live data appears on the ModbusCloud dashboard by checking that temperature readings and fan intensity values update correctly.

Things to watch for

01

Flow setpoint values appear incorrect or extremely large. What is wrong?

The supply and extract flow setpoint registers are unsigned 32-bit integers that span two consecutive Modbus registers. Ensure the template maps these as uint32 with the correct register pair. Swapping the high and low words will produce invalid values.

02

Temperature readings show unexpected negative or zero values.

Temperature registers are signed 16-bit integers (int16) in degrees Celsius. Confirm the register data type is set to int16, not uint16. Also verify the correct Modbus slave ID and register addresses.

03

The gateway cannot connect to the DOMEKT C8 over Modbus TCP.

Check that Modbus TCP is enabled in the C8 control settings and that the unit's IP address is reachable from the gateway's network. The default Modbus TCP port is 502. Ensure no firewall or VLAN configuration is blocking traffic between the devices.

04

Humidity readings from Panel 1 or Panel 2 are not updating.

Humidity values require optional external sensors connected to the DOMEKT C8. If no humidity sensor is installed on a given panel, the register will return zero or a default value. Verify sensor wiring at the unit.

Registers (37)

23 read / 18 write

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