Honeywell R6660D to Nest 3rd gen

[soopercerial]

Hi, I want to upgrade my Honeywell R6660D to a Nest 3rd gen.

I have looked over the forum, but my thermostat seems to have more wires than in the other pictures.

Could someone please tell me which ports the wires should go from my current thermostat to the Nest Heat Link?

Thank you very much.

 

[RandomGrinch]

Your R6660D has cables daisy chained in and out - these connections will have to be replicated on the Heatlink.
This can be tricky as the Heatlink terminals are quite small.

The two browns in the L terminals on the R6660 go into the L on the Heatlink.
The grey and black with blue sleeve in N, go to N on the Heatlink.
The two Green/Yellow wires in the earth terminal must remain connected together and can go to the earth terminal on the Heatlink.

That leaves the wires in terminals A and B, these connect to terminals 2 and 3 on the Heatlink.

 

[soopercerial]

Thank you very much.

I am used to wiring plug sockets but this was a bit above me haha.

I appreciate your reply