Baxi Argenta 32 and Nest Gen3

C

Colin Cooper

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Hi all,
I have been trawling the internet trying to get some information on how to connect a nest to my new boiler, i live in Spain and the instructions for the boiler don't seem to be available in English... Baxi didn't either bother to reply!
as i understand it the Baxi have the usense ubit that connects via the R-BUS plug, so i tried that... doesn't seem to do anything :(
i have addad a couple of pics and would be very gratefull if their is anyone that can help me out here.
Many thanks
Colin
IMG_20191111_154717792.jpg
IMG_20191111_154711496.jpg
 
sorry your post is very confusing what are you actually asking ? are you trying to wire the nest up to the R-bus on your boiler ? that wont work you need to wire it to the Tout
 
Hi Ian, hehe... it does read a bit confusing i admit! sorry for that.
I'm trying to get my nest working, and just got a bit confused where to connect it to..
ok, so two wires from the Tout plug, where would they go into the heatlink? 2&3 i'm guessing?
 
Hi Ian, leading on, connected already to the Tout is an outside thermostat, i'm guessing some sort of safety device so the boiler doesn't get to cold?
if i disconnect this and attach the nest, i get a red error message saying "outside temp closed"?
Colin
 
That is a weather compensation sensor so connect that back the way it was, what thermostat do you currently have ? sensor
 
I like a challenge and now know that you have an oil condensing boiler, try connecting the R-bus terminals to the OT terminals in the nest
 
no underfloor, yep its a new oil fired boiler... ok, i will try that
Thanks
Colin
 
if you dont have any external control , where do the two wires in the R-Bus go to ?
 
I have tried them into 2&3 and now to the OT terminals ... With no luck :(
I do know that the RBus is the direct connection for the baxi usense smart controller, so I thought that it was probably the connection, boiler end for the nest...
 
I cant see it in your pics, is there a terminal X3 on the pcb ? can you send me a pic of that please
 
Hi, yes there is, its a 3 pin connector port... one of which has an earth symbol and the other two are blank.... not at my house at the minute, but i know thats there as i have looked at it.
 
That is where you need to wire the Nest into but you will have to do more probably insert a link somewhere, send me a pic when you get home and I will try and work it out for you
 
Hi Ian, Ok thats starting to make more sense now, ... this is a pic of the whole PCB
your help is very much appreciated :)
Colin
 

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