I was asked to provide some instructions on a different forum so I thought I'd write a short guide.
Temps are significantly better running a 172w pelt in the MCW50-T, but using it at 24v produces alot of heat in the coolant. I ran mine at 18v for the most part and found that to be a good compromise between cooling ability and heat production.
You can buy a 40x40x3.2mm 172w pelt from dangerden http://www.dangerden.com/mall/Pelts/peltiers.asp
It requires 24v to operate at 172w, you can run it at 12v at roughly 90w still better than the factory pelt in the MCW50-T
Replacing the orginal pelt is pretty easy:
1) Remove the foam insulation on the bottom of the MCW50-T, not all of the foam, only the part that overlaps on the bottom of the block. Try to remove it without damaging it. I used a sharp razor blade and just cut it off in one peice so that it can be reused.
2) Remove the hex head bolts holding the cold plate to the bottom of the block.
3) Remove the cold plate, the old pelt may come out stuck to the cold plate. PAY ATTENTION TO THE RED WIRE ON THE OLD PELT, THE NEW PELT MUST BE INSTALLED WITH THE RED WIRE IN THE SAME PLACE If you put a pelt down in front of you with the red wire on your right, the part of the pelt that is facing upward will be the COLD side and the side facing downard is the HOT side !
4) Remove the pelt, use caution not to tear the rubber gourmet that goes between the MCW50-T and the pelt as this is the only thing that prevents the wb from leaking. The surface of the pelt is directly exposed to the water in the block. You will see what I'm refering too once you open it up.
5) Place the new pelt in the rubber gourmet. DOUBLE CHECK TO BE SURE THAT THE COLD SIDE IS FACING YOU
6) Lightly cover the the surface of the pelt that is going to be against the cold plate with thermal compond (I use Ceramique). I think the best aproach is just to lightly haze the surface of both the cold plate and the pelt.
7) Replace the cold plate and tighten down the hex head screws ( Don't overtighten they can break/strip )
8) Replace the lower portion of the foam insulation you removed, I used RTV silicone to stick it back to the foam insulation that was left covering the sides of the waterblock.
Thats it ! I hope this helps, its easier than it sounds
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