Improvements to the shop air compressor are for the SMB, right?
Added a solenoid to the compressor output:
The solenoid is powered when the lights are on. When the lights are off, none of the air lines have an air supply (except what is already in the line). Because I have a small leak somewhere, the lines bleed to empty. Turning on the lights will bring the pressure back up in the lines.
And another solenoid at the compressor drain:
The solenoid is wired to open when the compressor runs. There is also a small valve in the drain line. The valve reduces the drain flow to a small dribble, enough to drain the accumulated water but not enough to make the compressor run significantly more. The drain tube goes through the wall and outside. The solenoid is 120V and the compressor is 240V, so the solenoid is wired from one phase to neutral, not across the compressor motor.
I have an extra drain solenoid if anyone wants to do a similar drain, PM me.
Mike