PVC is fine for the intake.
As for the breaker for the compressor I take it that the other electronics like the fans etc. are also wired from the same breaker circuit? You don't want the have a fan blowing fresh air into a blazing fire.
All this progress and those nice pictures you post really makes me want to start building too. However untill now it's only a paper exercise for me. Although I'm gathering parts. My compressors are no way near as nice as yours but the rest of the setup will be. Keep up the nice work!! In time I'll return the favor by posting my own setup.
“You don't want the have a fan blowing fresh air into a blazing fire” Haha. Nor would I want the other fan sucking fire out of the cabinet and blowing it directly into my storage loft!
Both fans get power from a second circuit and it has a single pole breaker (110V) in the main panel. I was tempted to pull power for all the 110V components from one of the hot legs in the dedicated 220V compressor circuit, but I’m not sure if this is frowned upon by the electrical experts.
I mentioned it before some time ago, but I feel it is an important point to make again. This may be unique to my situation, but I wanted separate control on the pump and the shop air solenoid valve. With a previously pressurized tank, there will be times when I don’t need to switch the pump on because I just need a little blast of air somewhere. There will also be other times when I need to completely deplete the tank, and to do so, I need to turn on shop air without the pump coming on. I was halfway down the path of putting these items on the same switch when I realized I needed independent control. I will add, however, that I doubt I will ever turn on the pump without turning on the shop air as well, so those actions could be combined. Just a little food for thought.
I would love to see what you have designed (be it in paper or hardware form), so feel free to post it here. There is always something to learn from other people’s ideas. I started putting a schematic together for mine while it’s all fresh in my mind, otherwise a year from now, I’ll be scratching my head trying to figure out the circuit and logic.






















Monday to be exact and with any luck I'll be picking up some engineered drawings 




















I sure can be a little slow some times but I think I figured out shopnuts birthday lol that one will be easy to remember 






