Hidden Closed Loop Intake

[Delphinus]

Ohhhhh oh ho !!! Tricky, very tricky!! It took me a while to see it, but yes now I see it. The outlet has to be higher than the standpipe if you don't want that to happen.

[Delphinus]

Or I guess a check valve.. But I myself don't like having to rely on a check valve to prevent a flood.

[Delphinus]

You've lost me. What was the original question? I thought you were asking if you could have your CL intake in the overflow box. Or are you asking about the additional hole in the overflow box?

[Delphinus]

Oh ... wait. The question is about whether it's a good idea to use an overflow box that doesn't lead to the sump at all?

Interesting. That seems like it could work. No idea what pitfalls to expect but it seems like a workable idea..

[Dez]

Now that we have it sorted out that I can't have the intake in my overflow (due to using Herbie Style Drain and don't want water draining out and wanting returns on the bottom). Any suggestions on the original purpose of this thread? How does my original hand drawn diagram look? The idea is to have that as a completely separate box.

(I spent way more time than I should have on that mock up diagram of "what if power failure occurs when inlet is in overflow box)

[golf nut]

Originally Posted by Delphinus

Ohhhhh oh ho !!! Tricky, very tricky!! It took me a while to see it, but yes now I see it. The outlet has to be higher than the standpipe if you don't want that to happen.

Then what happens is the tank settles to the level of the closed loop feed, then the water in the overflow drains to the standpipe height.

When power comes on there is no water in the overflow for the closed loop pump and it runs dry....play it safe .... do it right.