Remeha eTwist

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manjh
Posts: 354
Joined: Saturday 27 February 2016 13:49
Target OS: Raspberry Pi
Domoticz version: 3.8153
Location: NL
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Re: Remeha eTwist

Post by manjh » Tuesday 02 October 2018 15:06

Harrie1 wrote:
Tuesday 02 October 2018 13:41
manjh wrote:
Tuesday 03 July 2018 19:58
[...]
As soon as I have the OTGW I will try it an report back.
Any news on this Hans?
Not yet. I have the materials on my desk to build a second OTGW, this one will be UTP connected.
As soon as I find some free time I will put it together and assemble it. But then it will take me a while before I get to the house with the Remeha Tzerra, I don't go there every week in this time of year.. 8-)
Hans

manjh
Posts: 354
Joined: Saturday 27 February 2016 13:49
Target OS: Raspberry Pi
Domoticz version: 3.8153
Location: NL
Contact:

Re: Remeha eTwist

Post by manjh » Monday 22 October 2018 18:24

OK, I have tested my OTGW with ESPEasy unit for WIFI communication, with the Remeha Tzerra 28c plus, and eTwist thermostat (Room Unit).

Although the Tzerra is controlled with OpenTherm, the eTwist is not. To make it work, Remeha provides a small white box, called E-twist gateway.
The wire between the Room Unit and the gateway is using R-bus. The wire from the gateway to the Tzerra is OpenTherm.

So: I installed my own OTGW between the Remeha gateway and the Remeha Tzerra. Activated the unit in Domoticz, and I could see the usual info coming through in the log. At first a lot of hex data, but after a little while the info made sense and I could recognize several OTGW values.
Sounds promising, but wait. I tried to change the room setpoint. My device in Domoticz changed to the new temp, and in the log I could see the TT: command going out.
Unfortunately the E-Twist room unit did not pick anything up.
Also, the Flame On signal was coming through, but it was not reliable.

My conclusion: the Remeha Gateway unit does not like working with the OTGW.

As another test, I took the unit back to my home (the Tzerra is installed in my summer home).
At home I use a Remeha Calenta, with an iSense thermostat. Both are pure OpenTherm. I have an OTGW installed between the boiler and the room unit, works great.
So I decided to put the second OTGW between the first OTGW and the thermostat. This did not work well, similar results as the test with the Tzerra.

Conclusion: use only one Gateway between the RU and the boiler. Gateways switch in serial with another gateway don't work well...

In my case it is not a problem: with the E-Twist I can control the unit from my Android phone, so I don't really need an OTGW there. :)
Hans

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