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post #11 of 13
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Just one question. Is it okay to run two identical pumps with different speeds in series? More specifically an MCP655 on 4 and one at 5.

My loop is really restrictive so I can either use my two mcp655 (although 1 is whining at speed 5) or buy an mcp35x.
Edited by jello900 - 9/5/11 at 8:34am
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post #12 of 13
Thread Starter 
Quote:
Originally Posted by jello900;14829300 
+1 rep for this!

Just one question. Is it okay to run two identical pumps with different speeds in series? More specifically an MCP655 on 4 and one at 5.

My loop is really restrictive so I can either use my two mcp655 (although 1 is whining at speed 5) or buy an mcp35x.

Yes, no problem at all mechanically. The only thing to watch for with two pumps in series is noise harmonics. Having different speeds is actually a good thing, but sometimes matching exact speeds is difficult and can cause sort of an undulating harmonic noise between the two noise source. It's not hurting anything, but I think it's always a good idea to play with pump speeds a bit when running two in series get the best noise quality.

One at setting 4 and one at 5 is no problem at all.band.gif
    
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post #13 of 13
Quote:
Originally Posted by Martinm210;14829740 
Yes, no problem at all mechanically. The only thing to watch for with two pumps in series is noise harmonics. Having different speeds is actually a good thing, but sometimes matching exact speeds is difficult and can cause sort of an undulating harmonic noise between the two noise source. It's not hurting anything, but I think it's always a good idea to play with pump speeds a bit when running two in series get the best noise quality.

One at setting 4 and one at 5 is no problem at all.band.gif

When not running pumps at the same speed which should be the faster pump, the first in the series of the last?

In my case I have two PMP-400 pumps in the Koolance RP-401X2.

Thanks smile.gif
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