Add nest thermostat to caravan boiler

[AndyG_NI]

Hi, I would like to add a thermostat to my caravan boiler. The boiler is a morco gb24. It has connectivity for a thermostat but I'm not sure what wiring diagram from nest I should use. I think taking L and N from boiler to nest heatlink and then two wires from the boiler thermostat connection to the low voltage ports on the nest heatlink would be correct but I don't know, can anyone help? Images attached are from the boiler manual

 

[ianmcd]

and then two wires from the boiler thermostat connection to the low voltage ports on the nest

which ports are you using ?which nest model do you have ?

 

[AndyG_NI]

Haven't bought any model as yet

 

[ianmcd]

what do you want to do with the nest ? there are different models what functions do you want, do you have internet in the caravan with your own Router ?

 

[AndyG_NI]

I have a net connection in the van.
I think I need to use the 230v combi diagram as shown below.

To connect I think wiring would be: 4 core cable, l & n joined boiler to heatlink, link wire between live and

, wire from boiler port marked timer to heatlink normally open port 3

 

[ianmcd]

your boiler doesnt support OT so you would be better with the Nest E it is battery powered and only has 2 terminals No and com and the two wires at the thermostat connections on the boiler connect to these ports or a single channel hive if you want a mains powered heatlink, that nest you are suggesting can be used but not as easy as you think to wire it up and you want get any extra functions using that as opposed to the others

 

[AndyG_NI]

Ian,

Thanks - is the nest e not limited to low voltage? Can it handle full 240?

 

[ianmcd]

Ian,

Thanks - is the nest e not limited to low voltage? Can it handle full 240?

it is volt free so can handle high or low voltage, just be carefull there are some US nests appearing from ebay and stuff they are low voltage only

this is the UK one, I dont mean buy it from there, buy it wherever you want this is just so you know what it looks like

https://www.toolstation.com/nest-th...V78dJhuS3xlhtBEUi5bMFVQitgeczlMEaAiWYEALw_wcB

 

[AndyG_NI]

Thanks very much, one final question, is there anyway to identify common and normally open?

 

[ianmcd]

I know you dont have an existing thermostat, you just fit the receiver near the boiler and run a 2 core flex to it

 

[ianmcd]

Thanks very much, one final question, is there anyway to identify common and normally open?

yes they are clearly marked the nest e only has the two terminals and it doesnt matter which way round the wires go, it has two other terminals marked OT but your boiler doesnt support this so just forget they are there

 

[AndyG_NI]

So as there is no current stat, just two core flex from boiler to heat link and if it doesn't work switch the wires e.g. blue wire to co brown to no, if doesn't work then brown to co and blue to no?

 

[ianmcd]

So as there is no current stat, just two core flex from boiler to heat link and if it doesn't work switch the wires e.g. blue wire to co brown to no, if doesn't work then brown to co and blue to no?

yes exactly just two wires doesnt matter which way round it is just a switch, will work either way round, you will have to leave the timer on the boiler set to constantly on and let the Nest override it

 

[AndyG_NI]

Ian, thank you very much for your help, and for not making me feel as stupid as my questions must have been. Have a good Christmas

 

[ianmcd]

Ian, thank you very much for your help, and for not making me feel as stupid as my questions must have been. Have a good Christmas

And a very merry christmas to you and yours too Andy