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PostPosted: Thu Dec 20, 2018 10:50 am 
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Hi there,

I am trying to wire a Nest to another Sime boiler and wondered what wiring did you use to setup the Heat Link?

Was it the 230V with the bridge from L to 2 or did you go with the low voltage setup?

I've wired mine with low voltage and doesn't call for heat.

Any help would be great.



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PostPosted: Thu Dec 20, 2018 11:31 am 
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best to start your own thread. I have split this post from the other thread.

original thread here sime-super-90-mkii-and-nest-3rd-gen-installation-t96492.html

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PostPosted: Thu Dec 20, 2018 9:10 pm 
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You should wire it according to what your boiler needs, not whichever way you think is best.

Fret not, a forum is a collection of opinions. Above, are mine.

Which is correct? Metre or Meter? Click the link to find out more.

Working on anything electrical? have you got a multi meter? why not? Would you hit a nail with a shoe?

If gloom had a voice, it would be me. :mrgreen:

:idea1: How to post a picture on this forum Click here

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PostPosted: Sat Dec 22, 2018 4:04 am 
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I have read a couple of the manuals, found here and it seems some of the boilers are Opentherm. So step one is work out is your model OpenTherm or not, Nest 3 will work either way, but wiring is completely different.

230 volt AC is low voltage, 24 volt DC used to control output is extra low voltage, I am only saying that to avoid mistakes.

If your boiler does have OpenTherm that is best method of control, what it does is adjust the boiler output rather than simply switching on/off so that there is little or no hysteresis in the room temperature.

I know Nest works with Energenie MiHome TRV heads, but I have not tried pairing them, they have a follow command.

However as how to connect without have the model can't say, and if I did know I can only read the manual the same as you.

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