I need compressor to turn on @ 110 psi not 90 psi, what do I adjust ?

Regulator has no knob's to turn.

_______________________
Bill says...

Typically, it's the pressure regulator (with the knob and gauge) that you use to set the pressure level for your downstream application or air tool.

It's the pressure switch that "reads" the pressure level in the tank, and alternatively turns your air compressor on and off to maintain that tank pressure between the two set points of the pressure switch.

I always tell folks that the pressure settings of the pressure switch are set at the factory, as they are optimal for that design and model of air compressor.

Should you wish to tamper with them, you may find that you have voided your warranty.

Having said that, look for the two threaded rods at one end and inside the cover of the pressure switch. Typically, one of those nuts will adjust the cut out pressure level, and the other the cut in. Don't adjust either by more than a quarter turn at a time, and then run the compressor to see what the change in setting has done for the operation. You will soon see which is cut in and which is cut out.

If you try to set the cut out pressure level too high, you will, I would expect, soon render your air compressor, in need of major repair.

Good luck, and tread softly.

Bill