It will work with the 14TB no problem, I've used 16TB drives in the 690!
Be warned: most 14TB drives (WD Red, etc.) are SMR (archival) drives and might suffer massive performance loss depending on your intended workload! If SMR won't work for your application you'd have to look at CMR drives such as the WD RED Pro drives (so loud they'll vibrate the screws right out of your case!) or WD Gold drives (quiet but have an automatic sleep/spin down that can't be disabled without running software on your computer called "hdd never sleep" that constantly read/writes to the drive)!
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