HOB Overflow Flooding solutions

Exactly, you need to take the time to set it up properly and test the way you have the overflow set up.

 

I didn't think so, but I think that Mariman may have an issue with his overflow setup. You want the pump as low in your sump as possible. You should find out why your tube would lose siphon.

 

Ok I'm sorry I'm coming into this convo late but I'm new to tank plumbing and trying to understand it all.

So by this logic we are assuming that there are no chambers and the sump is one large tank? Because if it had baffles and multi chambers, the baffles would keep the return chamber water level constant until the levels of the baffles equalized, right? And if the return was just in one large chamber raising the pump would keep it from returning as much as if it were more submerged and reduce water over flow in the DT.

I'm not saying that this or that is correct I'm just trying to gain a better understanding of syphon and water flow.

 

It's either raise the pump in the sump to eliminate the DT overflow risk but monitor levels in return pump section or vise versa. Personally I put as much water as possible since my HOB overflow isn't going to lose siphon

 

how do you start an HOB overflow when you first get it?

 

Fill the outer box with water. Stick an airline tube into the U Tube, and suck out the air. Then you're good to go.

 

Fill up both sides of the overflow. The inner and outer boxes. Otherwise you will not pull water in to the u-tube.

 

True, I was under the assumption that the inner box would be filled by the virtue of installing the box. I also assumed a running tank, not one setup from the start with a HOB.

 

Here's a snipet from my 38 gallon build from about 2 years ago:

Next up was priming the overflow siphon. How to do this............hmmmm.....
Went and got 2 one gallon water jugs from the basement. End caps fit perrrrrrfectly on the ends of the siphon tube (u tube, j tube, whatever it's called).



Filled overflow (with 1 inch ballvalve in the sump closed) and then primed the u tube. Placed blue end caps on each end. These don't stay on by themselves, but just by applying a little pressure, I was able to get the u tube in the overflow box with minimal water loss. As you can see, some air got in, but not enough to break the siphon.



Plugged in return pump and opened both ball valves. Rewarded with sucking sound as water rushes out of overflow, down the drain line, and into the sump.