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PostPosted: Mon Jul 24, 2017 5:27 pm 
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Hi all,
I am installing 3rd gen Nest in my place and I need some confirmation from you smart fella.
I have an Ariston boiler and a Honeywell thermostat.
My understanding is that the boiler is connected to the thermostat with a low voltage connection ( I checked with the tester and was 12V ). This should point me in the direction of the low voltage setup for my Nest.
I will so do:
- Connect the two wires coming from the thermostat directly to the Nest Heat Link ( http://www.plumbcity.com/wp-content/uploads/2016/02/Nest-Thermostat-Installation-Guide-UK.pdf page 35 ) connecting them to terminals 2 and 3.
I then bring power to the Heat Link on N and L with a standard 220V connection. I will then leave the Nest thermostat alone charging him with the USB cable.
My understanding is that 1) I need to power the heat link with an high voltage line 2) The heat link will close the circuit turning on the boiler by the wires that are now connected on the actual thermostat and that I will be wiring on 2 and 3.

Will this work?



Thanks in advance.


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PostPosted: Mon Jul 24, 2017 5:32 pm 
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Better asked in CH. Ill move it.


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PostPosted: Tue Jul 25, 2017 7:36 pm 
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Which model Ariston do you have?

The Heatlink connects to the boiler
The thermostat talks wirelessly to the Heatlink
The cable between thermostat and Heatlink is just to power the thermostat (replaces the USB lead).


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PostPosted: Tue Jul 25, 2017 8:47 pm 
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Am I correct to assume from your low voltage description that it is a Clas, or Clas Evo combi?

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PostPosted: Tue Jul 25, 2017 10:40 pm 
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This is the boiler
Image
and this is the thermostat
Image


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PostPosted: Tue Jul 25, 2017 10:54 pm 
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The connection I am planning to make are:
Image
Image
Power the heat link bringing a 220 line to the first two contact on the left and wire the low voltage wires coming from the boiler in contact 2 and 3.


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PostPosted: Tue Jul 25, 2017 11:25 pm 
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Correct. And if you're having the Nest thermostat located where the old Honeywell stat was, you can connect two of the wires that currently run to the stat to T1 and T2, and the other ends to the two terminals on the back of the Nest thermostat wallplate to power the thermostat itself without needing a USB power lead.

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PostPosted: Wed Jul 26, 2017 8:00 am 
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Ok, I assumed wrong then!

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PostPosted: Wed Jul 26, 2017 7:12 pm 
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Thanks guys, I just got confused by the 110-220 mark right above the 2-3 contacts.

I'll give this a go.


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