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Koolance RP452X2 Serial Question

post #1 of 4
Thread Starter 
Hey, tried searching had trouble finding an answer so here goes...

I have the Koolance RP452X2 and I have two of the Swiftech MCP655 PWM pumps set up. I have the 180 degree elbow connected and the plug out of the bottom as well as the acrylic bypass piece in the left res. If I'm not mistaken this should be serial with both res tanks combined to one. When I power everything up I need to leave the plugs off the top two fill ports to equalize pressure. Then everything will seem to function fine.

The other day I had the power off and I topped off the two sides of the res. A small amount of pressure hissed out when I opened up the top plugs (which was fine). After topping off, I put the plugs back in and powered up the PC. It didn't seem to have any problems, but I noticed the water level in the left res didn't move at all. So I opened up both top ports on the res while the PC was running and then everything equalized again and now seems to be working properly.

I'm new to water cooling and basically was wondering if this is normal or if I have something configured wrong. I've read about people setting this res up a hundred different ways, so I wonder if I'm not set right, or if it's just a matter of "that's how you equalize the two" having limited knowledge and experience. Many thanks for any help.
post #2 of 4
Which revision do you have of this reservoir? I know there's at least 3 and they're all a little different.

Most likely though, it's just how the reservoir functions. I have the rev 1 version and I leave the long plug and bypass piece both in. This completely isolates my left side so that the level never changes. But if I were to take the plug out I'd imagine the level drop would be caused by pressure differential (two 655's produce a large pressure head). When you equalize both chambers while running and then seal the system back up it will be level until you turn your computer off. Once the pumps are off they no longer produce a pressure head, so there will be a pressure difference between the two chambers which will cause the water level to become unbalanced. You could re-level both chambers, but once you turn your computer on the pressure difference will cause the water levels to become unbalanced.

So basically, the levels will be different depending on whether your computer is on or off. You're not doing anything wrong, this reservoir just has a few quirks.
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post #3 of 4
Its completely normal and you have it set correctly for dual serial.
When the right Res level drops if an air bubble comes through the system the left Res can't drop with it if it is sealed. That creates a tiny low pressure in the left Res as gravity trays to keep both sides level. Opening the left side let's air in so the water level can drop to match the right side.
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post #4 of 4
Thread Starter 
Thank you so much guys. I appreciate the clarity. I'll just periodically crack it open to equalize it. Also, I'll give the case a few more tilts and so on to double triple check for air bubbles.

I have the Rev 2.0 seen here.

http://www.frozencpu.com/products/12480/ex-res-254/Koolance_RP-452X2_Dual_525_Reservoir_Rev_20_Serial_or_Parallel_for_1_or_2_Pumps_RP-450_Laing_D5_MCP655-B_MCP655.html?id=DM3siKkA&mv_pc=177
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