Installing NEST 3rd Generation Thermostat in place of Drayton LP241

[hdavis248]

Hello,

I know there are a few threads on this but I have followed the advice and have not been able to resolve my issue. I have been trying to install my 3rd Gen nest thermostat in place of my existing Drayton LP241 and Salus wireless thermostat system. Yesterday when I installed it, when using over ride mode (pressing the hub in the cupboard) the heating would come one but the thermostat wouldn't call for the heating. Now I have no heating at all and nothing will start the boiler / heating.

Here is my Drayton wiring:

Following the advice on this forum here is the wiring I have done:

For clarity I moved the wires as follows:

(N) > (N)
(L) > (L)
(1) > (4)
(4) > (3)
(3) > (6)

I then added links between L - 2 - 5

I then understand I need to decommission my Salus thermostat but I don't quite understand what wires I need to remove. It is wired as follows:

And as follows in the terminal box:

Blue 2
Green / yellow 3
Grey 7
Browney red 1
Black 4

Any help would be really appreciated.

Thank you!

 

[Deleted member 267285]

If you decommission that are you going to use the usb lead for the Nest?

 

[hdavis248]

Yes, I have a stand for the NEST so it can be downstairs.

 

[Deleted member 267285]

Isolate the electrics safely and remove the wires that would have gone to the Salus.

 

[ianmcd]

you need to make a link between the two switching wires from the salus in the wiring centre when you remove the Salus

 

[Deleted member 267285]

you need to make a link between the two switching wires from the salus in the wiring centre when you remove the Salus

Thanks, I originally put this, but then edited because I thought it was wrong

 

[ianmcd]

Thanks, I originally put this, but then edited because I thought it was wrong

No mate if you dont link out the existing control then you have an open circuit

 

[hdavis248]

How do I know which are the switching wires? There are four wires in my Salus box - NO COM and then N and L. Are you saying the link needs to go between the wires that are going into COM and NO?

 

[Deleted member 267285]

How do I know which are the switching wires? There are four wires in my Salus box - NO COM and then N and L. Are you saying the link needs to go between the wires that are going into COM and NO?

Yes com and no, L and N are Live and neutral - do not join these.

 

[hdavis248]

Thank you! That is very helpful.