Domekt R 400 V
Controls Komfovent Domekt recuperator ventilation via Modbus TCP
This ModbusCloud template controls a Komfovent Domekt R 400 V heat recovery ventilation unit over Modbus TCP. It reads outdoor, extract, and supply air temperatures, current supply and extract flow, fan intensity, power consumption, heater power, heat exchanger efficiency and recovery, and filter impurity. Writes include on/off, eco and auto modes, current mode selection, mode setpoints for Away, Normal, Intensive, and Boost, and air quality heating control.
- Protocol
- Modbus TCP
- Connection
- Ethernet, Modbus TCP
- Registers
- 25, read and write
- Brand
- Komfovent
- Key readings
- Outdoor / Extract / Supply Temperature · Current Supply & Extract Flow · Supply & Extract Fan Intensity · Power Consumption & Heater Power · Heat Exchanger Efficiency & Recovery · Filters Impurity
- Available commands
- On/Off, Eco, Auto Mode · Current Mode · Mode Setpoints (Away, Normal, Intensive, Boost) · Air Quality Heating
- Compatible models
- Domekt R 400 V
- Last updated
Registers (25)
19 read, 10 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| Outdoor temp | °C | Read | |||
| Current mode | Read and write | ||||
| Active alarms count | count | Read | |||
| Extract Temperature | °C | Read | |||
| Suplay temperature | °C | Read | |||
| Current supply flow | m³/h | Read | |||
| Current extract flow | m³/h | Read | |||
| On_off status | Read and write | ||||
| Eco mode | Read and write | ||||
| Auto mode | Read and write | ||||
| Current supply fan intensivity | % | Read | |||
| Current extract fan intensivity | % | Read | |||
| Power consumption | W | Read | |||
| Incing protection | Read | ||||
| Energy saving | % | Read | |||
| Heat exchanger efficiency | % | Read | |||
| Heater power | W | Read | |||
| Heat exchanger recovery | W | Read | |||
| Filters Imupurity | % | Read | |||
| Room sensor | Write | ||||
| Air quality heating | Write | ||||
| Mode Away setpoint | °C | Write | |||
| Mode Normal setpoint | °C | Write | |||
| Mode Intensive setpoint | °C | Write | |||
| Mode Boost setpoint | °C | Write |
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If a device is not in the library yet, we build the template for free as soon as we have the register data.
Use cases
- Boost ventilation when a CO2 sensor in a busy living room exceeds a threshold, using a ModbusCloud automation.
- Switch to Away mode automatically when nobody is home based on a presence sensor.
- Log real-time heat recovery efficiency to verify the unit reported value under different outdoor temperatures.
- Track filter impurity to schedule maintenance before indoor air quality drops.
- Monitor post-heater power draw to quantify the extra electricity consumed during cold weeks.
Installation
In the Komfovent Domekt web UI, enable Modbus TCP under the network configuration menu.
Note the unit IP and set a DHCP reservation.
In ModbusCloud, add a Modbus TCP device at the unit IP, port 502, slave ID 60 (the Komfovent default).
Import the Domekt R 400 V template. Temperatures and airflow readings appear within one poll.
If you use Away, Normal, Intensive, Boost scheduling, verify the unit accepts Current Mode writes by changing the mode from the ModbusCloud device detail page.
Things to watch for
Outdoor temperature reads as a huge positive number in winter. What is wrong?
The template expects int16 at address 903 for signed negative values. If your setup decoded this as uint16, subfreezing temperatures roll over to 65000+ numbers. Ensure the data type in the ModbusCloud template is int16.
Current mode writes do not take effect.
Current mode at address 4 is int32, meaning it needs two consecutive registers for both read and write. If your client only writes a single 16-bit register, the mode change is ignored. The ModbusCloud template handles this correctly by default.
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