Can someone tell me what the adjustments on the bottom of my air manifold are for. In the picture there are 12 of the adjustments with an aluminum hex nut and an adjusting screw in the center. I assume they are to adjust the pressure on the "in" and "out" sides of each switch, but I'm not sure. I thought I might be able to turn both adjustments off and prevent air going through the solenoid valve, but that's doesn't seem to be the case.
Manifold-1.jpg