junkers ZWB 24-1 DE

[heapxor]

Hello there,
I am also interested in that solution (reason why - https://community.home-assistant.io/t/bosch-gas-condensing-compact-heating-center-how-to-control-the-flat-heating).

Is that solution still working fine? Do i need to create a PCB by myself?

I am not sure what's 1-2-4 interface, my Junker heater comes with some PCB interface, where original CR 100 thermostat is plugged, i think its 24V circuit using modulation?

Also is there some extension to that solution with a valves, ie. each room separate thermostat (to capture temp) and its valve that is controlled by solution?

Appreciate your help!
Thanks for a great project.

[niesamowitysmyk]

This solution works perfectly.
In project you can find pcb project files and place order for example in "pcbway" or others provider.
For control external rooms you need to find other independent solution - for example smart valves

[heapxor]

@niesamowitysmyk thank you for the confirmation.
I do still miss the high level picture...

That project controls the heater using modulation. Assuming the pcb has its own temperature sensor?
So in case i want to extend solution to be able to read temp in multiple rooms and control temp in different rooms using electrical valves i somehow needs to - redesign it?

Maybe i am wrong and that project doesn't act like a room temp meter, and we need to send Temperature data to it ... ie it only turn on/off heater using modulation based on the input temperature value.

thanks

[Strooom]

A DS18B20 temperature sensor is to be connected to the board. This is where the software gets the temperature. This kind of sensor allows several sensors to be connected to the same bus. But the maximal length of the wires is about 1 meter, so not enough to run to different rooms.

This design was never intended for controlling multiple rooms, and I think it would be too far off to adjust or tweak it.

[nagyrobi]

I run about 25 pieces DS18B20 sensor all around the house + one out in the yard at 50m distance. They are all connected in parallel, using a 1k resistor as pullup. Using twisted pair cabling for data and gnd.