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Hi,

I have build a system to control my heating. All rooms are controlled individual on time and temperature. The boiler ( Nefit ) I control via on/off control based on the boiler temperature. The boiler temperature is calculated based on the outside temperature. The system works very well. However, since my Nefit can also be modulated I am looking to control it via OpenTherm ( with Nefit convertor ).

Is there anyone who has experience with this setup ?

Looking forward for responses.

Best Regards,

Arno

I have a Nefit proline heater and I am using the Honywell Round for modulation and also had to buy the Nefit OpenTherm converter.
It works very well with the gateway!

Hi Cyberde,

Thanks a lot for your answer. Would it be possible to send a wiring diagram how your have connected everything ?

Br,

Arno

Pretty simple.

Thermostat --- OpenTherm Gateway -- Converter -- Nefit

The converter can only be connected one way to the Nefit, other than that it doesn't matter how you connect the wires. Generally it's a good idea to connect for example Red to Red, but again, it doesn't matter.

first check with nefit

the converter doesn't work with every nefit

Hi,

How can you control the CV boiler temperature directly from the OpenTherm interface ?

Br,

Arno