Nest Heatlink wiring to combi boiler.

[Zmaster2k]

Hi all,

Wiring up a Nest Gen3 Thermostat tomorrow on my combi boiler an ancient Worcester 24i RSF. That currently dossnt have a stat but an old mechanical clock.

It does have the option for a stat, so. I've opted for a neat Gen3 off my sister who bought one but didn't work in her new house.


Below is a wiring diagram from my manual.
Currently wired up like the diagram on the right.




So ill be wiring it up like the left.....


However what terminals do I wire them to on my heat link?

Thanks in advance
Matt

[Zmaster2k]

Forgot to upload the nest diagram.

[Zmaster2k]

Zoomed in a bit..... But pretty much My thoughts....

[Zmaster2k]

[Zmaster2k]

Anybody? 💭

Don't want to fry the heatlink 😂

[Zmaster2k]

So on my wiring....


RN = Neutral
RI = Switched Live
RL = call for heat

There's a link already In place on boiler, that needs swapping over.

[Zmaster2k]

Yeah that makes sense, like replacing the mechanical timer and switch completely.

[Zmaster2k]

thebraketester said:

So.... Switched Live (grey).... Live(brown).... Neutral(Black)



Black goes in N.... Brown goes in L.... Link L-2 with a jumper wire..... Grey goes in 3

Hero this sorted it....

All working as it should.

Even linked to my Google home seamlessly 😂


Thank you all for the help.

[Zmaster2k]

FRG0 said:

RN to N on Nest
RL to L and link to 2 on Nest
RI to 3 on Nest

The time clock can be left in and just overridden as the stat will be the ultimate 'call for heat' as in if the clock was calling for a boiler run but the link wasn't in place (RL to RI) as in your photograph the boiler wouldn't fire.

It can be done with some 3 core flex as the Heat Link doesn't require an earth, just sleeve the green/yellow with brown if you have any.

Wired it up to the mechanical clock terminals instead.... Works like it should.

Should I switch to the RL instead?