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Swiftech 35X and D5

post #1 of 12
Thread Starter 
I'm thinking about putting a spare D5 back in my loop (listed below) for redundancy. The loop doesn't need it for flow as I'm getting enough with the 35X. I know that there wouldn't normally be a great problem with mixing 2 pumps according to what I've read from Martinm210 however I'm using PWM on the 35X going from roughly 28% to 60% as the temps build up.

If I used the D5 on a fixed speed and the 35X on PWM am I likely to have problems?
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post #2 of 12
Only if you drop below the rated flowrate of one of the pumps. Which is somewhat unlikely assuming you have a minimum around, I don't know, 40%

Why not just run the pumps at set rates. Your flowrate is frankly going to be large anyway considering the pressure.
    
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post #3 of 12
Thread Starter 
The problem with the 35X is that it's noisy above about 33% and delivers good flow at about 38-40% and best flow (temps wise) at 50-60% by which time it's too noisy for me. In the short time I've been using it I've come to appreciate the PWM functionality and would be reluctant to set it above 30%.

After saying that maybe with the D5 at setting 3 and the 35X at 30% it'll cover redundancy and still have enough flow rate for the temps not to suffer too much if one fails.

I'm having to strip my loop down as I've realised I didn't put thermal pads on 3 tiny areas on my cards (poor pic in instructions) so might try it anyway. I don't want to damage either one of the pumps though.
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post #4 of 12
There's no issues with using different pumps in the same loop.
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post #5 of 12
Thread Starter 
Not even if one of them has a varying speed/pressure?
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post #6 of 12
similar pump are ok as Martin stated ,don't think X35/D5 are similar
    
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post #7 of 12
Quote:
Originally Posted by coolhandluke41 View Post
similar pump are ok as Martin stated ,don't think X35/D5 are similar
I'm pretty sure what he said was that there's no data to show that it won't work together.
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post #8 of 12
sure it will work ,i think he had DDC/D5 in serial ,if you want to disregard the noise ,one of the pumps heating up and failing or possible pump cavitation be my guest
P.S. give it a try and see how they run
    
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post #9 of 12
Why would a pump heat up and die, and even if it did, that's the point of having them in serial?? There's no moving gears, remember its a magnetic pump?
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post #10 of 12
Quote:
Originally Posted by tsm106 View Post
Why would a pump heat up and die, and even if it did, that's the point of having them in serial?? There's no moving gears, remember its a magnetic pump?
The general thought behind it is if you are flowing water through faster than the pump you could speed up the pump beyond it's design specs. And while it may not have gears, it will be inducting a current back to coils in the pump, which may in turn shorten its life.

Though as mentioned, it's somewhat harder to do to pumps than fans since they normally run so far below their max flow. In our systems anyway.


To OP
Also, when I said 40%, that was really just picked out the air, I had assumed below that you wouldn't get any flow worth mentioning but I stand corrected! If you get decent flow at 30% go for it. What I had meant by it is not to set it so low it would essentially not be producing any flow.
    
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