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Help filling Koolance RP-452x2 V2.0! Before I destroy ANOTHER pump...

post #1 of 5
Thread Starter 
So originally when I filled up my loop using this reservoir and two D5 vario pumps, it made some pretty horrendous noises but eventually stopped. It bled out very quickly and I was up and running in no time. However, about a month later, my second pump (the one which is located between the primary pump which draws directly from the reservoir body itself and the outlet) has now started making a terrible rattling/buzzing sound. It's not loud, but it certainly shouldn't be like this at all, since I used this pump without issue for 2.5 years in my last build and it was dead silent.

So, anyone running two pumps in serial on one of these Koolance RP-452x2 V2.0 models? If you could give me some tips on how to fill the thing so that I minimise dry running, I'd be very appreciative. As far as it seems to me, a moment of dry buzzing with this reservoir/pump combo is inevitable due to the pump being adjacent to the reservoir rather than below it, so I'm getting kind of disheartened reading these claims that running a D5 for even one second dry can destroy it, etc etc. I remember filling my last build and it would occasionally blerp out a sound if the coolant passed below its feed level and I'd cut power immediately, fill some more, and continue. Never had problems. Obviously a D5 can be damaged when run dry but I think a half second here and there on fillings seems to be okay from my experience. I just don't think it's possible to keep the pump fully submerged in water 100% of the time while filling... Especially on one of these.

My current method involves using only one of the pumps to fill it (the one which draws directly from the reservoir) and keeping the res filled as much as I can. I have a fill line fitting coming off the face of it at 45 degrees with a length of tube which I keep filled with water so that the reservoir doesn't easily run dry when powered on. When the thing is fully filled, I'll switch on the second pump as well for regular operation. I also intend to fill it with the case is on its back to that the reservoir is facing up, thus positioning the pump impeller horizontally rather than facing the floor in its installed position. Any other methods to share guys? Thanks!
Edited by lowfiwhiteguy - 10/3/13 at 11:37am
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post #2 of 5
The best way to fill a loop with dual pumps is just to have the one closest to the water inlet connected to the power until the loop is filled.
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post #3 of 5
Using pump 1 to fill the loop and having the whole unit on its back has worked just fine for me. I have the bypass in so pump 2 can't really run dry unless pump 1 does ... just like any other dual pump top. Once filled both pumps bleed the loop pretty quickly. While filling with only pump 1 I just use very short, 1 - 2 second burts of power to the pump and fill between each. It takes longer than say a huge tube res system but is really no more likely to run dry.

I have run D5 pumps completely dry for a lot longer than a couple of seconds and they were totally fine. I wouldn't tell people to do it to their expensive pumps, but it is definately one of those things in watercooling that is massively overblown.
Aquacomputer even made a video with 2 bare D5's running on a table. If short exposure is enough to destroy a pump I'd like to know how they managed to do that.
Edited by Jakusonfire - 10/4/13 at 12:44am
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post #4 of 5
Quote:
Originally Posted by Jakusonfire View Post

Using pump 1 to fill the loop and having the whole unit on its back has worked just fine for me. I have the bypass in so pump 2 can't really run dry unless pump 1 does ... just like any other dual pump top. Once filled both pumps bleed the loop pretty quickly. While filling with only pump 1 I just use very short, 1 - 2 second burts of power to the pump and fill between each. It takes longer than say a huge tube res system but is really no more likely to run dry.

I have run D5 pumps completely dry for a lot longer than a couple of seconds and they were totally fine. I wouldn't tell people to do it to their expensive pumps, but it is definately one of those things in watercooling that is massively overblown.
Aquacomputer even made a video with 2 bare D5's running on a table. If short exposure is enough to destroy a pump I'd like to know how they managed to do that.
Here's what they did:
Quote:
Originally Posted by Shoggy View Post

Quote:
Originally Posted by AddictedGamer93 View Post

Those poor D5's.
Quote:
Originally Posted by Syan48306 View Post

They just ran two D5 pumps dry without water! redface.gif
I already feel like a magician for doing that since I read similar things in other forums and on YouTube biggrin.gif Did it ever came to your mind that you can just add a drop of oil on the axis - no? Then you have learned something totally awesome today graduated.gif
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post #5 of 5
Thread Starter 
My pump magically came back to life today. Silent as anything. I agree, I think this dry running thing is overblown. I'm pretty sure if you left the house, your loop popped open somehow, all the coolant flooded out, and both pumps were left running for like 10 minutes I'm sure you'd be in trouble. But after googling and checking the forums... I've never seen a story of anyone having a pump die on them purely from the short buzzes you get as you fill the loop. I thought I was the first but the flow rate is back to full speed now, I have a new D5 on the way to me so I guess it's nice to have a backup if one of them actually kicks the can someday. thumb.gif
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| XSPC | Dual RX360 | | Dual MCP-655 | Variable-Speed | | Koolance | RP-452x2 | Windows 7 Professional 64-bit 
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| Acer | P243W | 1920 x 1200 | | Enermax | MODU87+ | 900W | | CaseLabs | M8 + Pedestal | 
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| Acer | P243W | 1920 x 1200 | | Enermax | MODU87+ | 900W | | CoolerMaster | HAF X | 
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Óðinn
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Methuselah
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CPUMotherboardGraphicsRAM
| Intel Core i7 | 2600K | 4.2GHz @ 1.33v | | ASUS | Maximus IV Extreme | | ASUS | ENGTX 580 | 933MHz @ 1.138v | 2-way SLI | | G.Skill | RipjawsX | 2133MHz | 8GB | 
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| Intel | 510 SSD | 120GB | | Western Digital | Caviar Black | 1TB | | XSPC | Raystorm | | XSPC | Razor 580 | Dual SLI | 
CoolingCoolingCoolingOS
| XSPC | Dual RX360 | | Dual MCP-655 | Variable-Speed | | Koolance | RP-452x2 | Windows 7 Professional 64-bit 
MonitorPowerCase
| Acer | P243W | 1920 x 1200 | | Enermax | MODU87+ | 900W | | CaseLabs | M8 + Pedestal | 
CPUMotherboardGraphicsRAM
| Intel Core i7 | 2600K | 4.2GHz @ 1.33v | | ASUS | Maximus IV Extreme | | ASUS | ENGTX 580 | 933MHz @ 1.138v | 2-way SLI | | G.Skill | RipjawsX | 2133MHz | 8GB | 
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| Intel | 510 SSD | 120GB | | Western Digital | Caviar Black | 1TB | | XSPC | Raystorm | | XSPC | Razer 580 | 2-way SLI | 
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| XSPC | RX360 | | Phobya | Xtreme 200| | MCP 655 | Variable-Speed | Windows 7 Professional 64-bit 
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| Acer | P243W | 1920 x 1200 | | Enermax | MODU87+ | 900W | | CoolerMaster | HAF X | 
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