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getting the right size vacuum pump
What would be a good cfm of vacuum pump to have. I do only resi work. What are the best brands and why? Thanks!!
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I recommend the YJ 1.5, because its the best setup I have ever used.
"Correct Installation is the Key"
.1 has killed more HX then Rush Limbaugh
What is your TESP?
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we use 5 cfm and 6 cfm pumps
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 Originally Posted by beachtech
we use 5 cfm and 6 cfm pumps 
Well, that explains alot
"Correct Installation is the Key"
.1 has killed more HX then Rush Limbaugh
What is your TESP?
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I have a 3 cfm dual stage I think it's a bit to big for the systems I have. I would try and get the smallest dual stage possible.
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 Originally Posted by weber
Well, that explains alot 
i use what they give me 
http://robinair.com/product-new/deta...=1061&catid=11
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This thread may help you:
http://www.hvac-talk.com/vbb/showthread.php?t=159232
Go to the JB website (jbind.com). There is plenty of literature available on selecting a vacuum pump that is right for you. Try to find a distributor of JB, they may let you test out some vacuum pumps. I'm currently testing a 7 cfm and a 3 cfm.
The most simple way to sum things up is that cfm doesn't mean a whole lot. Once the system reaches a vacuum, which is usually less than a couple minutes on small systems, a 1.5 cfm to a 10 cfm work pretty much the same.
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They work the same. But the larger one will still be drawing quicker. The primary is still bigger.
If you draw too quick, you could form ice crystals.
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I personally use a 6 cfm Yellow Jacket and have a never had a problem with it very easy to use and quick
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I use a 6 also.
Have seen a lot of guys use 7's.
No need for a large vac, for small resi stuff though.
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All I work pon is small residential sized systems. I have to play with the ballast within a few minutes to keep it around the 3000-5000 microns.....I'd rather it take a little longer to make sure it's not forming crystals instead of boiling off.
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So a 5 or 6 cfm YJ, robinair, or JB pump would be the best way to go. And always dual stage...right?
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If your not going to work on anything bigger the 20 ton, a 3 CFM works good.
But a 5 or 6 will do also.
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