What happens if you turn a rental back into PR?

[William Huston]

Hello All, 

I am still learning the ropes, i have a few rentals that were all previously primary residences.. Ive since turned them into rentals as i moved.. If i wanted to move back into one of those rentals and live it in myself, what would happen or should i say, what should i expect to do and happen that year and in the future... do i have to pay back the depreciation that year in taxes?