So by raising the open channel it creates more pressure to purge the air from the syphon. What happens is the open channel takes on water before there is enough pressure for the syphon to purge the air. If someone has a bunch of 90’s in there plumbing or other things to make it harder to purge the air from the syphon is usually the only time it’s a issue. The only reason for the syphon to be lower then the open channel is if u have issues purging air from the syphon on startup. It may still purge the air but it may take it a little longer to do so. Lowering it could possibly make it a little harder on the syphon to purge its air. How high is the water building up in the box on startup? If it is building up to the top of the box then lowering the emergency to 1/2 or so below the top of the overflow box may work if u only need a small amount of water for the pump not to suck air. I’m not sure lowering the emergency is going to work, but it’s hard to say without knowing more & it also may end up causing other issues. U must have a very small return section in your sump. Someone convince me this is a good idea or that I'm and idot -before I cut it! I clearly need to shorten the emerg standipipe height and I'm thinking it should be below normal tank level so it can return water to the sump faster on startup. Other than the finicky tuning, I find that on startup, not enough water gets back to the sump in time and the return pump sucks air, filling the display with air bubbles. My open channel is ~1/8" higher than the siphon and the emergency is ~3/8 short of the lip of the tank. So.I have a coast-coast setup and the overflow box water level is 1-2' below tank level. Most of all, according to the original designer, it's normal for the emergency standpipe to carry water on startup whereas mine is high and dry. I find the tuning is razor-sharp and I think this relates to the relative heights between the standpipes, the tank level and the level in the overflow box. Have the tank up and running and the overflow works but I suspect that it's not optimal.
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