1. The water level is selected by setting the switch at the desired level.This sets the tension on the diaphragm inside the water-level switch.
2. The water-level switch goes from the EMPTY position to the FULL position depending
on how much tension there is on the diaphragm.
3. As the water level increases in the tub, it also causes an increase in air pressure in
the air dome assembly. A hose between the air dome and the water-level switch transfers this pressure against the diaphragm in the water-level switch, causing electrical contacts (V toT) to close. This happens when the tub is FULL.
4. When the tub is drained to approximately half its original setting, the water-level will
return back to the empty position (V to P).
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