Grant Vortex 26 Oil Combi & Google Nest Thermostat (no previous thermostat or timer installed)

[joebooooy]

Evening all,

Just moved into a house with a Grant Vortex 26 Oil Combi boiler and no timer or thermostat.

Is it straightforward enough to install a Google Nest Thermostat Heat Link?

I’ve got the wiring diagram of the boiler and the Heat Link attached.

Thanks in advance.

Joe

 

[RandomGrinch]

I'm afraid I don't know much about oil combis, but the wiring looks straightforward enough...


N and L from terminals 2 and 3 on the Grant Vortex, would connect to N and L of the Heat link.

You would remove the orange link wire from terminals 25 and 26, and connect these to Heat link terminals 2 and 3.

If you intend to use the Heat link to power the Nest thermostat using terminals T1 & T2, the earth terminal on the Heat link must also be connected to the earth terminal 1, on the Grant Vortex.

Ideally you would use a 4 core plus earth flex to connect up the Heat link.

 

[joebooooy]

Thanks for the quick reply.

This Grant boiler simply has an off/timed/constant switch for the central heating. With this wiring setup I assume I’ll need to leave it on constant and the Nest will switch it off/on depending on the thermostat controller?

Thanks

Joe

 

[RandomGrinch]

With this wiring setup I assume I’ll need to leave it on constant and the Nest will switch it off/on depending on the thermostat controller?

Yes, that should do it

 

[joebooooy]

Can report back that it went well and all is working as it should, thanks for the advice!