Nest 3rd Gen & Valiant Ecotec plus 831 (again -sorry)

[oldguy]

Hi,
Currently have a Danfoss RX1 and TP5000Si wireless thermostat.

I've seen that in some situations the common on the heatlink is bridged to the live feed to give 240v call for heat to the boiler.

My current setup is shown for the RX1.

Is the wiring the nest heatlink really as simple as....

connect the L&N, and the grey to 2 (com) and the black to 3 (CFH) exactly as the existing setup?

Perhaps a really stupid obvious question but don't want to fry the boiler PCB!

 

[stem]

Yours doesn't need a bridge. In fact, if you put one in it could cause serious damage to your boiler. As you have worked out, yours would be:

Blue wire = heatlink neutral (N)
Brown wire = heatlink live (L)
Grey wire = heatlink (2) Heating Common
Black wire = heatlink (3) Heating call for heat.

No links!

The Nest Heatlink diagram you posted with connections to the hot water section is not applicable if your version of the ecotec is a combi.

 

[nitro23456]

Do not jumper live to common or you'll fry your boiler pcb.

The wiring is a straight swap as you suggest.

 

[oldguy]

Sorted! thanks for the quick response!