The system configurator says that the CoolIT Freezone Elite Cooler will fit into the Coolermaster 690 II case even though the COOLIT ECO C240 A.L.C won't fit in. I would have thought that if the C240 can't fit it the Elite wouldn't fit either due to its' larger size.
The reason why the ECO C240 doesn't fit is because it requires space to attach a 240mm radiator + fans to the case and the CM 690 II doesn't have the room. Even though the Freezone is a larger unit, it still only uses a single 120mm fan so can fit into more cases such as the CM 690 II.
Thanks, it was a shame really the 690 would have been great for a top mounted rad (without needing to mod) as the MK2 would too, they really missed a trick there.