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First water cool, need help with fans

post #1 of 4
Thread Starter 
Hi,
I'm building my first rig with water cooling but need some help with the fans.

My case is a Corsair 900D. I have 3 Corsair Air Series SP120 on the front, a 480mm rad in the basement with 4 SP120S, a 360mm rad in the top (push / pull) with 6 SP120S and a AF140 as the exhaust.

My problem is, I'm not sure how to connect them all. do I connect using Y splitters and then back to the controller (ie have 4 zones). The controller is a NZXT 3. Will this support 14 fans?

So Id have 4 fans at the bottom, connect 2 pairs with Y splitter and then connect the 2 pairs together with a Y splitter and then back to the controller.
Connect the 3 front fans together with a 3 way Y splitter and then back to the controller.
Connect the 3 pulls on the top rad with a 3 way Y splitter, and the 3 pushes with a 3 way Y splitter. Connect the 2 sets of 3 together with a Y splitter and then back to the controller.
Connect the exhaust back to the controller.

Or am I going totally the wrong way about it? confusedsmiley.png

Any help would be appreciated, thanks.
post #2 of 4
That fan controller has can control up to 5 fan channels - with the number of fans on each channel limited to a total watt draw of 15 watts. So you need to know how many watts your fan(s) draw. If you want to be on the safe side you can assume 150% power draw on spin up.

Put the case fans on one channel
For the other channels it depends on watt draw and the fact that the temperature in the loop will be within 1°c anywhere in the loop. So, speeding up any single fan or combination of fans that are anywhere in the loop will have about the same effect on cooling no matter where in the loop it or they are. Also, that controller has only one temp sensor, so all the fan speeds will key off of that temperature. It would be a good idea to get that temp probe into the water stream as you don't really care what the air temp is, only the water temp (which will be somewhere between 5 and 20°c of the air temp - depending on the *Delta T of you WCing system)

* Delta T = The difference between the ambient air entering a rad and the water temperature - it's a measure of cooling efficiency - that's not how much cooling, but how effective the cooling is. A high Delta T means there is more cooling available in you WCing system (so speeding up a fan or fans will have a large effect, a low delta T means that your WCing system is working about as hard as it can be made to work, so speeding up a fan or fans will have little effect.

So, the answer to you question about which fans on which channels is a little more complicated Than you suspect. It's a case of "You can't ask questions about what you don't even know you don't know. After a lot of Googling and/or failure you learn what it is that you don't know, and then you can ask about it."
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
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My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
  hide details  
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post #3 of 4
Thread Starter 
Thanks for your reply, that's helped me in the right direction.

I will put the case fans on one channel as you suggest. I'll then start with the top and bottom radiators on separate channels. I think worst case is I have to put the push / pulls also on separate channels but don't think I will need too as the fans aren't more than 2W from what I can tell.

I will also see if I can get the probe into the liquid so I can try and get a low Delta T.

I'm not sure what you think about this as a place to start but... its a start. I guess I have some learning to do. I really want to figure out how many splitters / extensions I need as I don't want to build my rig and then not be able to connect the fans.

Thanks for the advice, I'm sure I'll get there in the end.
post #4 of 4
You may want to be careful with splinters on a PWM signal. You need to read about PWM controls and how they work, and how fan manufacturers and controller manufacturers sometimes don't exactly follow the PWM standards in their products to understand the pitfalls of splitting. But the good news is that there are a number of ways to do it successfully. In a nutshell you want to separate the PWN and tachometer signals for all but a single fan from the fan power connection, Ie one single PWM control signal for all fans (that are on the channel), but separate power to them all.
 
 
 
Edited by billbartuska - 6/30/16 at 7:07am
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
  hide details  
Reply
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
  hide details  
Reply
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