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Old 12-23-2015, 01:38 PM   #1
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AC drain idea

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I bought this little venturi pump to try to hook up to my Ac drain. It currently drains into the center bilge area and the bilge pump can't get it all out. Stays wet all the time.

My plan was to put this pump inline on my AC raw water cooling line and hook the drain to the auction side. However, I noticed the restriction in the AC raw water line is pretty severe (see tiny hole in pump pic). Think that will cause too much back pressure on AC raw water line?

There is really no room to run the drain overboard due to the center location of the bilge area.
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Old 12-23-2015, 02:13 PM   #2
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Dude!
I've bought one of these too to deal with that issue and had the same concerns... As I haven't installed it yet I don't know if that will be an issue. There are $200 units (Mermaid) out there that do the same thing and everyone seems happy with them. I'll update my experiences but it won't be until Spring.. Affordable $6 experiment if it doesn't work!

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Old 12-23-2015, 02:25 PM   #3
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Think that will cause too much back pressure on AC raw water line?
Yes. It will never flow enought water with that small a restriction in the line.

Plus the hole look so small that it will clog up very easily.
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Old 12-23-2015, 03:05 PM   #4
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Dammit! Maybe I could divert some flow to this venturi with a Y valve of some sort
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Old 12-23-2015, 03:31 PM   #5
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Dammit! Maybe I could divert some flow to this venturi with a Y valve of some sort
That's a thought worth pursuing...Let me know if you come up with a solution before i do!
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Old 12-23-2015, 03:42 PM   #6
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Why don't you just open the hole up?
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Old 12-23-2015, 04:20 PM   #7
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Why don't you just open the hole up?

Thought about that but figured it was engineered to work with that small hole, and enlarging it might screw it up.
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Old 12-23-2015, 04:41 PM   #8
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Opening up the hole would lose the venturi effect, but you don't really need the venturi effect on the suction side on the r/w pump.

I'm just wondering if this arrangement may cause you to lose raw water circulation due to sucking air in from the a/c drain line.
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Old 12-23-2015, 05:38 PM   #9
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I bought this little venturi pump to try to hook up to my Ac drain. It currently drains into the center bilge area and the bilge pump can't get it all out. Stays wet all the time............
Well that's a really crappy design but you already know that. If you can get a similar device from an AC supply shop (particularly a marine one, it might work and not restrict the flow. Restricting the flow is not good)

Have you considered running the drain into a shower sump and then out through the hull? A shower sump has its own float switch and pump and is pretty well sealed so odor shouldn't be a problem.

You could even tie the output of the shower sump into a sink drain if you can't install a dedicated thru hull.
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Old 12-23-2015, 05:43 PM   #10
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Opening up the hole would lose the venturi effect, but you don't really need the venturi effect on the suction side on the r/w pump.

I'm just wondering if this arrangement may cause you to lose raw water circulation due to sucking air in from the a/c drain line.
The device would be installed on the outlet side of the AC unit, not the inlet. If it sucks air (the pan is dry), it doesn't make a difference.
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Old 12-23-2015, 05:49 PM   #11
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Right. The outlet side was my idea.

I still think the diverter valve idea might work, so I can control the water flow to this thing and let the excess pressure bypass to the thru hull exit.
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Old 12-23-2015, 07:15 PM   #12
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Opening up the hole would lose the venturi effect, but you don't really need the venturi effect on the suction side on the r/w pump.

I'm just wondering if this arrangement may cause you to lose raw water circulation due to sucking air in from the a/c drain line.
I wonder how small the hole is in the Mermaid unit? Can't be that small or the A/C wouldn't work due to lack of water flow.
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Old 12-23-2015, 08:26 PM   #13
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Got a shower drain sump? Both my AC's piddle into the shower sump. Works fine.
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Old 12-23-2015, 08:34 PM   #14
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Why not put a condensate tank and pump near the A/C? It has a float valve and pump that runs only when it needs to and will pump it out wherever you want it. Many handle 10+ foot heads. The run from $50-80 each.

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Old 12-23-2015, 08:38 PM   #15
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AC drain idea

I can't run a hose from this centrally located bilge to anywhere. It's damn near impossible as far as I can tell. That's why I was trying to make this work and use an existing hose.
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Old 12-23-2015, 11:43 PM   #16
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Sailboaters are making the venturi pump work.

http://forums.sailboatowners.com/ind...nsator.119660/
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Old 12-24-2015, 06:49 AM   #17
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They appear to be using a water bed drain kit. That fitting looks like it just tappers down a bit to create the venturi effect. As apposed to using a large restriction like that small hole.

If true, that would work just fine I would think. As far as maintaining proper cooling water flow goes.
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Old 12-24-2015, 06:58 AM   #18
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The device would be installed on the outlet side of the AC unit, not the inlet. If it sucks air (the pan is dry), it doesn't make a difference.

I probably didn't explain this very well.
Its the engine sucking air that I would be concerned about.
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Old 12-24-2015, 07:21 AM   #19
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An off the shelf diaphram pump will do almost as well as a shop vac.

But unless there is a pit to drain YOU will have to operate the of/on switch .

As these pumps can run dry , I would use a timer , and just let it run for 10-15min.

Most wet switches don't do well with 1/4 inch of water.
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Old 12-24-2015, 07:26 AM   #20
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AC drain idea

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Originally Posted by Capt.Bill11 View Post
They appear to be using a water bed drain kit. That fitting looks like it just tappers down a bit to create the venturi effect. As apposed to using a large restriction like that small hole.



If true, that would work just fine I would think. As far as maintaining proper cooling water flow goes.

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The venturi I have has a one way valve that won't let the pressurized water inadvertently flow back into the suction side. I don't think the water bed fill has that. Or maybe that's not a concern?

But I agree, if the hole on my unit is too small it could restrict water flow so much that it will cause other problems. Also, if any gunk from the AC pan gets into this little valve it's gonna clog it up. Hmmmmm.

Waterbed drain cutaway (I think). This is not the actual plastic waterbed drain but I think this is how it works.
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This actually looks like a better solution IMO.
I think I will order one of the $6 waterbed drains also and compare.

I do worry if either one of these plastic venturi based pumps will hold up to the pressure of the AC raw water pump. Does anyone know what the PSI is on these systems?
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