Heloc on my primary then turn to rental

[Eric Hamilton]

Hi I have a question I know if you sell your house and have a 2nd mortgage it is usually due. 
But if I borrow against my heloc for a rental property  and then turn my primary house into a rental will they make me pay it back before I move to another primary residence? I would see no reason why as its still in your name and are making payments on it? Any advice is appreciated.