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Old 02-23-2013, 10:37 AM   #21
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The setup for an a/c system is normally thru-hull ->strainer->centrifugal pump->a/c unit->overboard. If you tee into that system, say immediately after the strainer, there is a possibility that the lift pump for the watermaker may suck air backwards through the a/c pipework and push it into the hi-pressure pump. If that turned out to be the case, an either/or selector valve would solve the problem.
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Old 02-23-2013, 10:56 AM   #22
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Quote:
Originally Posted by windmill29130 View Post
Question: Would it be possible to tee off one of the AC thru hulls as an inlet for water, versus cutting in a new thru hull. You wouldn't be able to run the AC unit whie making water, but you would be able to get it installed without a haul out.
Thoughts?
You can as long as the thru hull is large enough. I've done this successfully on 2 different boats. The manufacturer would prefer a dedicated thru hull though. If you do tee off from the AC thru hull, don't use any chlorine based cleaners for your AC system. The 2 biggest RO membrane killers are oil and chlorine.
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Old 02-23-2013, 11:59 AM   #23
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Quote:
Originally Posted by windmill29130 View Post
Question: Would it be possible to tee off one of the AC thru hulls as an inlet for water, versus cutting in a new thru hull. You wouldn't be able to run the AC unit whie making water, but you would be able to get it installed without a haul out.
Thoughts?
I suppose it could be done, but both Spectra and Village Marine are very explicit that the WM must be plumbed with a dedicated intake. Both void the warranty if you install it otherwise. And they like to see a forward facing scoop too. Both vendors installation manuals are available for download from their web sites. Other brands probably are too.
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Old 02-23-2013, 02:34 PM   #24
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good info thanks. never thought about chlorine. I'm going to build myself a water maker i have left over ro membranes
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