Types of Mortgages - What do these mean?

[Jon DeCamp]

Below is mortgage history data for a property:

The property was sold in 2004 and purchased by current owner for $248,000. It looks like there was a mortgage for $173,600. It looks like the owner put down a 30% down payment and borrowed the rest.

What does the refinancing column for 2006 mean? There are two mortgage amounts, a "Refi" for $25,000 and a "Seller/Carry Back" for $30,000. What do these mean? Can the total amount of equity be determined from these numbers?