Installed today but don't know if I have dual fuel.

I installed a Nest in my apartment today. It asked if I have dual fuel, and I'm not sure. All I know is that I will be billed for the central boiler monthly along with water and trash. We have both AC and heat.

If it helps (and to check my work), here is how the wires started: http://i.imgur.com/cYYCRkQl.jpg

The yellow wire was in W1, but Nest gave me an error. Since there was a small metal bar connecting W1 and Y, I moved it to Y and the Nest setup worked.

Here it is now: http://i.imgur.com/Al7uIUJl.jpg

Thanks for any help!