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Alphacool DC-LT Ceramic pump and tops information. - Page 6

post #51 of 202
The ceramic pump on this Alphacool res though powerful for its size is not that strong to push fluid around if you have a mid size to large rad set up. The pump is also prone to not able to pump liquids even if it's ON if you move the case so slightly. You need to squeeze the tube sometimes if you move the case & look at the fluids moving or check your CPU & GPU temps using temp monitoring software (Core Temp, GPU Temp, etc.). If your CPU & GPU temps goes up abnormally chances are the pumps are not moving liquids & you need to either tilt your case until you heard the pump moving liquids or squeeze the tubes until you determine that the liquid is moving. You must fill the res all to the top with liquid at all times (even this is not a guarantee) that the pump will be able to move liquids).

The 1st 2-3 weeks of use of this pumps you'll heard some noises. After the break in period, the pumps are almost dead silent. I did try to clean the res after more than a month of initial use & found some crytalline deposits (in the inlet & outlet ports) that disintegrates when squeeze with fingers. I tried also opening the back of the pump just to look if it can be modded to add the extra Tachometer wire for speed & found that it can be done easily by just soldering another wire. The pump's back cover is just glued in place, opening it will cause the back cover to get dettach easily if you don't glue it back. Adding a Tachometer wire to the pump is pointless as the pump have very low wattage as well as low pumping power to push liquids around if you have a mid size to large rad set up. If you're cooling more than one component, make sure your cooling tube is less restrictive. Avoid 90 deg angled fittings & shorten the tubes as much as possible.

The Alphacool res is the one having the issue with liquid flow, not the pump. If you're thinking of buying this res/pump set up, consider using other silent res/pump alternatives if you have some space to put things.


Edited by Cheaptrick - 8/14/12 at 11:43am
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post #52 of 202
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Very useful info. Especially the picture of pump internals and knowledge that third wire can actually be added. I just cant understand why did Alphacool opt to not to add rpm signal wire as well as this pump is clearly intended to be run off motherboard fan header with its low power consumption. The rpm signal in that scenario would be quite useful for feedback at what speed your pump is running as well as assurance that its actually functioning.

The issue of not getting the fluid moving although the pump is working can be either pump or that res/pump-top combo fault. I personally would suspect the second considering all the reports of questionably quality for that res part of the combo. Now, there is supposed to be a second revision of the res part where "quality issues have been sorted out" but dunno - have no experience with a "good quality" res part.

There is this separate plexi top for the pump as well and when I searched for the reviews it seemed all the reviews were done with the plexi top instead of this 5.25'' piece. It's possible it might be of better quality as the reviews have not been complaining about quality of the plexi top but as I have no personal experience with it cant really comment.

I'm not that happy with my 5.25'' res part either although I quite like the pumps. I am considering ordering myself the separate plexi tops for my pumps (they are approx 15 euros a piece so almost the same price as standalone pumps tho) and have already ordered separate round reservoir part for my loop.
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post #53 of 202
I actually purchased (4) of this tiny pumps with the extra (2) intended as backups. Tested the other (2) pumps & got almost the same result as the 1st (2) pumps. The noise was still there when I tested the other (2) but the noise is not that worse & was gone after (3) days.

I'm actually satisfied with this pump. I think this is a superb pump despite the flaws in the reservoir. I got a very silent PC. Just upgraded my card to a GTX 680 SC & will be adding another card to SLI. I got better liquid flow with it. It can handle my hardware very will.

There's really nothing about the revision 2 of the reservoir. It's about the same I guess. The only deference is that they just added a thicker O ring to the reservoir/pump set up.

My set up with the shortest & least restrictive tube I could do.

Edited by Cheaptrick - 8/13/12 at 5:53am
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post #54 of 202
Partly, the pump works in siphon effect.
Edited by Cheaptrick - 8/13/12 at 7:07am
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post #55 of 202
Quote:
Originally Posted by Cheaptrick View Post

I tried also opening the back of the pump just to look if it can be modded to add the extra Tachometer wire for speed & found that it can be done easily by just soldering another wire. The pump's back cover is just glued in place, opening it will cause the back cover to get dettach easily if you don't glue it back. Adding a Tachometer wire to the pump is pointless as the pump have very low wattage as well as low pumping power to push liquids around if you have a mid size rad set up.

Nice internal shot of the pump. On the flip side of the image, does the pump have a coil or a flat screened disc of copper? If a flat disc, the pump would reflect a pancake motor technology.
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post #56 of 202
I recieved the New V.2 Res Back Plate the other day & my pumps are now much quieter than the V.1 back plate.. There was still too much "Motor whine" at the full 12v So I attatched them to my Aquaero & lowered the volts a little & now it's pretty much silent & still pushing well over 100L/h...


I did a little review of my findings e.t.c, so if anyones interested have a deco here: http://www.specialtechforums.co.uk/showthread.php?2850-The-ALPHACOOL-REPACK-SINGLE-5-25-quot-Drive-Bay-amp-2-x-DC-LT-PUMPS-BUNDLE To be honest once you get rid of the noise issues many have had with these DC-LT Bay Res/Pumps they really are fantastic little things.. I've just recieved the very Small Acrylic Pump Top & Small Res so will be giving that a shot in a few days or so. smile.gif..

N.
post #57 of 202
Quote:
Originally Posted by Nornam View Post

I recieved the New V.2 Res Back Plate the other day & my pumps are now much quieter than the V.1 back plate.. There was still too much "Motor whine" at the full 12v So I attatched them to my Aquaero & lowered the volts a little & now it's pretty much silent & still pushing well over 100L/h...
I did a little review of my findings e.t.c, so if anyones interested have a deco here: http://www.specialtechforums.co.uk/showthread.php?2850-The-ALPHACOOL-REPACK-SINGLE-5-25-quot-Drive-Bay-amp-2-x-DC-LT-PUMPS-BUNDLE To be honest once you get rid of the noise issues many have had with these DC-LT Bay Res/Pumps they really are fantastic little things.. I've just recieved the very Small Acrylic Pump Top & Small Res so will be giving that a shot in a few days or so. smile.gif..
N.

The whining sound problem is only temporary. After (2) weeks of initial use it's gone. There are some problems with the reservoir that needs to get fix. ..
(1) The reservoir grinded arcylic & glue residue that can clog your watercooled system.
(2) The pumps are not pumping liquids if the PC case is slightly moved or placed in uneven surface.
(3) There's no 100% guarantee that the water cooling solution is being circulated even if the pumps are running.
(4) The build quality of the Alphacool reservoir is very poor. The acrylic face plate back black coating is done poorly.

The only fantastic thing about this pump/res set up is the pump being small &/or low profile. It doesn't have enough power to pump liquids esp. on large watercooling set up. You also have to worry about liquids not getting circulated. This reservoir needs to be recalled.

Don't get this pump/res set up unless Alphacool fixes the problems.
Edited by Cheaptrick - 9/7/12 at 2:32pm
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post #58 of 202
Quote:
Originally Posted by Cheaptrick View Post

The whining sound problem is only temporary. After (2) weeks of initial use it's gone. There are some problems with the reservoir that needs to get fix. ..
(1) The reservoir grinded arcylic & glue residue that can clog your watercooled system.
(2) The pumps are not pumping liquids if the PC case is slightly moved or placed in uneven surface.
(3) There's no 100% guarantee that the water cooling solution is being circulated even if the pumps are running.
(4) The build quality of the Alphacool reservoir is very poor. The acrylic face plate back black coating is done poorly.
The only fantastic thing about this pump/res set up is the pump being small &/or low profile. It doesn't have enough power to pump liquids esp. on large watercooling set up. You also have to worry about liquids not getting circulated. This reservoir needs to be recalled.
Don't get this pump/res set up unless Alphacool fixes the problems.

The fouling of the impellors noise didn't go away with mine after running it for around a month & a half but did go as soon as I fitted the V.2 Back Plate

(1) Never saw any sign of this when I stripped mine
(2) It's true that you need to careful when moving the PC while the pumps are working. (Intake needs to be set lower in the Res)
(3) Get a flow meter wink.gif.... Never had an issue with them not pushing the fluid around even when I've lowered the Voltage (this is in a simple loop as in the end of my review, but the pumps still worked well even on the much more complicated Loop (just to see what they could do) I first tried them on)
(4) The Reservoir I had was of very good quality, but yeh the coating on the back of the front face plate is pretty poor..

As I said, The Combo I have is working fine now, although I did still need to lower the voltages to eliminate the "Motor Noise" that is still there on the full 12V. I certainly never had an issue like you with the "GUNK" you found in yours when you stripped it down & the Build quality & finnish on the Acrylic was very Good on the unit I recieved some nigh on three months ago now!!.. So on that score It would seem that the quality control had lapsed somewhat to say the least...smile.gif

N.
post #59 of 202
I've used (2) of this res & found the same problems with the residue & pumping action. This problems been confirmed by other people using this particular res. I find it impossible that you didn't find this problems (particularly the residue problem) as it's clear that Alphacool did use lots of glue before putting the rubber gasket & screw the acrylic res in place.

http://www.overclock.net/t/1297231/problems-alphacool-dc-lt-12v-ceramic-pump/10#post_18015538
Edited by Cheaptrick - 9/7/12 at 4:05pm
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post #60 of 202
Whooo Whooo!!... Hey man take a chill pill.. I'm not here to have an argument or criticize you or what you found!!... I'm just saying what my experience was with this particular bit of gear...

I don't really care whether you beleive me or not or find it "Impossible that I didn't find this problem"... "I DIDN'T" find that particular problem you or others have said they found with the glue buisness!!
I can assure you If I had found that problem I would have said so..

Sorry you find it so hard to beleive, But there it is & I stand by what I said as I'm sure you stand by what you say... At the end of the day I'm just expressing what I found....End Of!!...biggrin.gif

N.
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