VR33 Install on eco tec plus

[boxer01]

Hi
I am new to this forum and would like some advice on fitting a vr33 open therm module on a vaillant ecotec plus controlled by a nest 3rd gen. It's a basic heating system with no hot water control.
I am having difficulty finding an installation guide for the vr33, I have read that it plugs into x31 on main pcb and some say you plug into x32, has anyone fitted the vr33 on an ecotec plus.

 

[Deleted member 120897]

Does it not come with a manual? Just found this, so if no joy here, maybe contact these?