Nest Vaillant VCW 296 5/5

[brunod]

Hi,

I currently have an Vaillant ecotech plus VCW 296 5/5.

I want to connect my google nest thermostat V3 on it.

My current thermostat is connected to the BUS -/+ (blue and brown wire).

How do i connect it to my new google nest?
I connect the N and L from my PCB to the N and L of my heatlink. But how do i connect it in the correct way to control my heating?
Thanks!

[catheryn]

Hi @brunod, 

Thanks for posting in the community. 

I understand you have some questions regarding wiring compatibility for upgrading your current system to a Nest thermostat.

To provide the best advice, we'll need a clear picture of your current wiring setup.

Please share a photo of the wiring behind your current system. Make sure the wires and labels (in case they have it) are visible.

In the meantime, you might find this helpful: Nest Compatibility Checker

This tool can help you determine if your system is compatible with a Nest thermostat based on your current wiring.

Thanks, 

Catheryn.

[brunod]

Here is a photo.

Current thermostat was connected to BUS + and -.

I have already connected an N and L to my heatlink.

How do I connect the rest of the thermostat?

[catheryn]

Hello @brunod, 

Thanks for your reply and the additional information. 

Before providing any advice for your current wiring, we also need a picture of the  wiring configuration for the old thermostat

Thanks in advance, 

Catheryn.