Rental property sale with seller finance loan

We purchased a home that was our primary residence for about seven years.  We then purchased a newer home, and began renting the other home after extensive renovations.  The accountant placed it into service Oct. '13 with a cost basis of original cost plus renovations.  We recently sold the home to the renter and we hold a personal mortgage that earns interest.  The home was place into service with a value of 203K less the depreciation taken over the past 4 years of 29,013.  We sold the home for 195K, but had also had to add a new AC unit with a value of 6.5K.  How do we equate the seller finance loan installment with these values.  The sale would have been at a small gain.