Yes, you can adjust a 30 50 pressure switch to 40 60. Follow these steps for adjusting the switch:
• Unscrew the cover of the switch and locate the spring mechanism inside.
• Locate two screws that attach to this; they control cut-in and cut-out points.
• To increase (or decrease) either setting, turn each screw clockwise (or counterclockwise).
• Carefully observe changes in pressure readings as adjustments are made.
Once finished, replace cover and test new settings before continuing use.