All sounds good but it sounds like you used a clear chip and not a set chip.
You need to use a Set Chip to activate and set the BV denomiation. So if you used a Set 15, did you set the dennomiation to be 25c or something...
The fundementals are that the S+ works on credits, not coins or bills.
Here is what I mean:
When you insert a coin you get one credit. What kind of coin was it ?? the machine doesn't know. Your coin comparitor has a sample coin, if the coin matches you get a credit, if it doesn't the coin gets rejected back out to the coin tray.
So when you insert a dollar bill, a five, ten or twenty how many credits do you get for a dollar ?? The set chip informs the machine and validator that it is a 25c (or other chosen denomiation) that the machine is a 25c - which means you get 4 credits for a dollar. In my home configuration I don't use bills much and I run my machine off tokens not coins. Subsequently I have my signage setup for 25c (the size of a token) but I use my bill valdiator as a 1c so I get 100 credits for a dollar.
You can get a set chip from any of our vendors (on the home page) - and you use it exactly the same way you did with your clear chip.