Immergas Boiler

Hardware
1

Hello community !

My goal is to control my boiler with HA i hope professionals in this this forum will help me to achieve this.

Boiler model : Immergas EOLO STAR 24 3 E

As i researched i found that this boiler has a remote controller option (CRD), also i found that it connects to boiler over 2 wires, that mean that it uses power and some protocol to communicate over same wires.

My idea is to simulate CRD and connect in this 2 pins to boiler, but how i can understand what protocol it uses ?

Also how i cant understand what commands boiler expect to read from CRD and vici verso ?

Link to manuals for boiler and CRD:

2

You should try to contact Immergas customer service and find the data communication protocol or ark for an interface that expose a known protocol (eg. Mod bus)

If they don’t answer (they may) you can try to find it but there are many possibilities (ebusd and opentherm are the most probable one).

Another way can be (check your appliance manual) to use a dry contact to start/stop the boiler and use the native thermostat only for management…

3

Thank you for answer !

I wrote to them, wait for response.

Just to use as on/off switch is to simple, this is a complicated pipes connected with 2 diferent places, and can be for someone too hot for some one to cold, that is why i want to control from ha, not to run to boiler each time.

I will try to find ways to test protocols that u said.

4

hi @Gritcan_Dumitru was wondering if you made any progress with Immergas on HA integration or any documentation from them?

5

Any progress with Immergas on HA?

6

No i did not get any succes (

7

I just saw that your boiler has only a dry contact to control the furnace (X6 connector on the PCB) , so you must set in advance all the parameters and with a simple wifi dry contact relay you can turn it on and off.
If you have multiple zones (that’s what I gathered from your posts) then you must add some other component to your HVAC system.
There are multiple choice based on what you have at home:

  • if you have radiators in both zones you can use smart TRV and get the temps from these into HA, when at least one of the TRV are below the setpoint you turn on the boiler, the other TRVs (the one above setpoint) will remain closed, so you’ll heat only the rooms that need it.

  • if you have zone valve then you can install wifi/zigbee/whatever temperature sensors and, when one zone need to be heated then turn on the boiler and open the right valve.