Swapping ESI Wireless Room Thermostat for Nest 3rd gen on Vaillant

[BJJ]

Hoping someone can confirm the following: As above, ESI ESRTP4RF already wired as attached so shouldn't (and I wouldn't regardless) need to alter wiring in boiler (Vaillant Ecotec plus 831). N & L is a straight swap, I am just unsure of which way 1 & 2 go to Nest 2 & 3.

Looking at the ESI manual (screenshot attached), ESI 1 is the COM (Linked Live Feed) and 2 is N/O (Normally open). Wuld I be correct in thinking that ESI 1 should go to Nest 2 (Common)? Therefore ESI 2 into Nest 3 (Common)?

If it is that straightforward I am happy to install, if not I will get someone qualified in but wouldn't want to if simple.

Cheers (and apologies if answered before but I couldn't find a similar swap in searches)

 

[Deleted member 267285]

Do you know which voltage side has been used inside the boiler? If not you will need to get someone in or be able to test the voltages at the wall plate under demand situations.

Hope this helps?

 

[BJJ]

Do you know which voltage side has been used inside the boiler? If not you will need to get someone in or be able to test the voltages at the wall plate under demand situations.

Hope this helps?

Afraid I don't - I will await a visit from my plumber who installed it. Thanks