In the photo above, the two adjustments located inside the red rectangle allow the user to adjust the cut in pressure setting (left nut) and the cut out pressure setting (right nut). Turning either of the adjusting nuts in a clockwise direction will increase the pressure settings, and the reverse if they are turned counter clockwise.
On this pressure switch, the adjusting nut in the small red circle is used to adjust the range of this switch. Turning in clockwise increases the range setting, adjusting both the cut in and cut out pressures at the same time.
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