Nest Install to Combi Boiler

Hi,

Mate recently got a Nest thermostat to control his heating as he currently doesn't have a room stat. The controls are on the boiler itself so will only be on or off depending on the timer. He wishes it to be controlled by temperature so to be more regulated and comfortable.

Looking at the boiler manual and the nest documentation looks simple enough.

L and N to power the HeatLink then a connection from the boiler to the HeatLink.




First image is the nest wiring and the second the boiler. I believe the wiring is simply boiler 2 to nest 2 and boiler 3 to nest 3 but want a 2nd opinion before I start the job.

 

Boiler (1) is the permanent live & Goes to Nest (L) with a link also to Nest (2) Common
Boiler (2) is the switched live and goes to Nest (3) call for heat
Boiler (3) is the neutral and goes to Nest (N)

The boilers integral timer will need to be set to be permanently on 24/7 so that it doesn't interfere with the Nest.

 

Thanks Stem, Fitted it this weekend and it works a treat.

 

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