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Alphacool DC-LT Ceramic pump and tops information. - Page 2

post #11 of 202
It's beyond 'loud noise', it's specifcally an issue with the reservoir and pump combination. With two working in serial, one of the major issues is that the inlet to the res is directly next to where the pumps draw water. When both pumps are maxed, the water from the inlet displaces the water in the res in a wave pattern as if you did not fill the res the whole way. I think this is the source of the issue with the major pump noise.

In addition to that, the pumps when secured tight enough to not leak actually rub against the reservoir making a grinding noise. When you loosen the pumps enough to stop this, you get really really close to leak territory.

I can't imagine that both of these design flaws would have made it out of Alphacool's testing, but I'm seeing a few people with the exact issues.

*EDIT*

Also, I went to straight power as well as powered through my 30W fan controller. The fan controller was able to run them at a higher speed than straight power, which is really odd. The noise was consistent throughout the range of speeds.
Edited by Michalius - 5/22/12 at 10:42am
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post #12 of 202
Thread Starter 
Hm that does not sound good. Especially the part where the pump grinds against the res. Missing some sort of standing wave pattern in simulations and quality control is one thing but missing something that obvious does not sound good.

I think if mine grinds against the res as well then I will try to put mine through warranty. Surely such thing would be unacceptable. Even assuming that they found out after the patch was done it should be relatively trivial to compensate by either milling extra half mm off the res or just putting a stiffer/thicker O ring in there.

I'll find out in few weeks how mine behaves. I will have a little amount of water above the res at the inlet as well though (T connector with a small hose going to top of the case for filling purposes as in my case the res will be connected quite rigid way and would be hard to drag a little bit out for getting access to the fill-port on the top of the res.
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post #13 of 202
Thats the other odd part. The fill port is recessed on the res, so when you get to the bottom of the fill port, you're still a good 2cm from all the way full.

I posted on the alphacool support forums, will contact for RMA/Warranty next to see how it goes.
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post #14 of 202
Just an update, and also a thanks to both Performance PC's and Alphacool customer service.

Alphacool believes the issue is being caused by the rear portion being mounted upside down, which is kind of fitting considering that the faceplate was as well. This slight change should fix a lot of the issues I'm having. Apparently there is an additional set of O-Rings that the pumps and/or res is supposed to come with which need to be used as well. Thinking about the issues I'm having, I think these changes should fix what's going on.

This was all completed in less than an hour or two this morning.
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post #15 of 202
Another update, and the OP should do this as well.

Long story short, there are supposed to be additional rubber o rings that help seal the pumps to the back of the res. What these do is provide enough spacing so the pumps don't have a grinding issue and will also dramatically reduce the noise issue. I can see from the pictures in the first post that you didn't get them either.

A big thanks to Performance PC's. I did most of my watercooling purchasing through them, but forgot that I actually ordered this res/pump from Frozen CPU. Despite that, Performance PC's is sending me the O-rings anway. That is some seriously good customer service.

700

The o-rings here are not the ones that I'm referring to. From the sounds of it, it's a larger one that will align with the outside edge of the pump.
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post #16 of 202
Thread Starter 
I will contact Aquatuning.de with this information and see if they are as helpful as PerformancePCs. The pumps I got are same as yours, i.e., with a smallish O ring on them, same as yours on the picture and thats all that there was in the envelopes.
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post #17 of 202
looking from the pictures (7 & 8) of the back-side of the DC pump, there looks to have a
planned third wire (tach?) output. like some of the ftwo wire fans, there is a place
for a wire, just not installed. the alpha res looks quaint, but i'd like to cross machine
a koolance 2-bay res with the DC. just have to make new pump block for back of
4?2x2 res. like mentioned, the fill-port is cast too shallow.

airdeano
post #18 of 202
hi people im gonna sound like a right noob now but thats cos i am, anyway my question is i have the same pump and res my pump is fitted in the left slot on the res but i dont know which is the in and which is the out for the res i know its a really dumb question but i need to ask as im doing my loop tomorrow.

hope someone can help me out and again sorry for being a dumb-ass lol
post #19 of 202
on picture # 3 the far left is the res inlet. plumb your return hose from the CPU or GPU to
the inlet. follow the thinking, youll want the return coolant to dump into the reservior.
the fitting on the far right is the outlet. plumb your hose to the radiator here. this one
should be routing coolant from the two cavities into the discharge hose routed to rdiator.

airdeano
post #20 of 202
thanks alot your a life saver
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