As conversations surrounding the design of a new youth center get underway, the nonprofit organization helping to fund the project has secured a significant donation from a newly opened bank branch. Representatives from Century Bank on Elm Street made a $30,000 pledge to the Andover Youth Foundation to go toward the $4.2 million Cormier Youth Center project, said Diane Costagliola, chairwoman of the foundation. Voters approved the project last year and authorized the town to foot $2 million in construction costs. The foundation has been collecting private donations to help cover its share of project costs. Additionally, the foundation has committed to fund $30,000 of the projected $90,000 annual operating cost of the center once it is completed. Andover Youth Services, which runs the youth activities program, is expected to pick up the rest of the expenses through new programs and revenue from events. The foundation also kicked off its public fund-raising campaign earlier this month during the annual Andover Day downtown event, where it raised $1,200 by way of an Apple iPad raffle organized by the local RE/MAX branch, Costagliola said. So far the foundation has raised more than $35,000 in private donations, adding to the $3.8 million it has secured for the project.