topic Re: Compatibility in Nest Thermostats

Compatibility

philz — Sun, 03 Apr 2022 06:52:10 GMT

Hi,

I would like to install a Nest thermostat (just for the design, possible savings and control via the Internet is nice).
I went on the Nest website and did some reading here and there and apparently the Nest thermostat is a simple on/off switch to the boiler. Therefore, the Nest thermostat itself only uses 2 wires (crusted = on I assume).
However, I opened up my current thermostat and there I see 4 wires (see picture). Is also normal that it is a bit more complicated because I can select night and day and separately set temperature for day and night ed.

The boiler is controlled by an Elco Klockner Logon M (see photo). I assume that this is in direct connection with the thermostat. The Elco controls 2 circuits (underfloor heating and radiators).
So at first sight I don't see how I can connect a Nest, so I wonder if there is anyone with experience with similar installations and Nest?
It has to work somehow I think, I could set the Elco to always be in 'day' mode (no more day/night) and then use the Nest to tell me when heating is required.

I know there is another box in between, the Heat Link, that should probably go to the Elco and then of the 4 wires to the current thermostat I only use 2 to go from the Heat Link to the Nest thermostat.
Any help or advice is welcome!
Thanks in advance!

Re: Compatibility

Vladut — Sat, 09 Apr 2022 07:54:37 GMT

Hi @philz,

Thank you so much for reaching out. This is a very good question indeed. Can you tell me if you've tried to run a compatibility checker?

Let me know how it goes.

Re: Compatibility

philz — Sun, 10 Apr 2022 09:29:44 GMT

Tried but didn’t find any answers

Re: Compatibility

DragosC — Sun, 10 Apr 2022 11:55:28 GMT

Got it. Thank you. No worries. Could you tell me please what answer you've received on the checker?

Re: Compatibility

philz — Mon, 11 Apr 2022 09:53:30 GMT

I have been using another checker:

https://store.google.com/us/widget/compatibility/thermostat?hl=en-US&GoogleNest

Looks much more detailed, the other was says it compatible, but I still have my doubts

Re: Compatibility

DragosC — Mon, 11 Apr 2022 10:20:37 GMT

Understood. Could you tell us please which wire is going where so we can tell for sure?

Re: Compatibility

george_t — Fri, 15 Apr 2022 16:08:47 GMT

Hi @philz. Just checking in, did you manage to check the last message from my colleague?

Re: Compatibility

DragosC — Mon, 18 Apr 2022 11:45:57 GMT

Since I haven't heard from you in a while, I'll have to close this thread. Should anything else come up, please open another thread and we'll take it from there. Have a good one and stay safe!