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The switch has a vacuum tube to it and the level is achieved by a cast tefflon piece with three carved out u shaped going from to large. As you turn the dial a spring with tension rides the u shaped tefflon piece. At the end of that spring is an adjusting screw that activates a plunger and the plunger in turn has something to do with the vacuum tube. Can you explain how all that works?
The thing that senses the water level is a diaphragm, that is moved by air pressure in the tube, that is caused by water entering the bottom of it.
The mechanism adjusts the pressure on a spring above the diaphragm, thus applying more resistance to its movement when the water level selected is higher. This in turn delays the pressure at which the water level switch operates.
There is also a "reset" position for when changing from a high setting back to a lower one, that vents the tube so any remaining water in it is allowed to escape.
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