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This siphon effect relies on atmospheric pressure to allow the pressure and pressure potential energy to drop as the water travels upward inside the sealed pipe. But eventually the pressure of the rising water reaches zero and no further reductions in pressure and pressure potential energy are possible.
Obviously, condensation water pitched downward could not defy the laws of gravity, flowing up through the supply trunk and not getting the supply trunk wet, but depositing water into the flex runs.. What was confusing to Logue was the fact there was no water in the evaporator condenser pan or emergency pan.