I have a 14kw model 5612 that I bought/installed about 16 months ago. My neighbor just bought the same model, but it turns out it is a newer model than mine. It is a 5872. Also a 14kw LP, but I see that it has a Nexus controller and there is not a charger in the transfer switch.
I was curious about the activation procedure that you mentioned here. Is this something for all Nexus controller models?
Yes it is.