Great Pics of the Selenoid. I like the set up and is fairly simple set up. Thanks for the diagram. That is awsome how you use the USB power to make sure the selenoid doen't engage again.
I am having some trouble getting the info I need from the sales person from Vintage Air about the rotary switches for the HVAC system. I am going to try and get tech support next week to see if I can get anywhere there. so Far they have told me the switches ares:
The Gen IV unit I am looking at is a "digital signal with the ECU and has variable speed motor with 35 speeds? I will update you next week.
Hopefully I can get some of my build started in the next couple weeks.