It's a 425 amp competition alternator. we told you when you bought it that it would require special care in it's use, or it can overheat. I have had one on my truck for almost a year, daily driven, with no problems whatsoever- but I am also mindful about maintaining my batteries.
It is totally normal for ANY alternator to operate in the 220-240 degree F range, especially if it is attached to a large load or battery bank.
By the way, e-mail works 24/7, so feel free to send us one if you have any more questions.