Many colleges and universities are setting new limits on adjunct hours, seeking to keep the part-time faculty members from being covered by the new federal health-care law. On Monday, the adjunct union at Kalamazoo Valley Community College challenged such a limit, filing a grievance with Michigan officials saying that the new policy violated the union's contract, MLive reported. The union called the limit a "unilateral change" in its contract, and said that the college had an obligation to negotiate over that type of change. A college vice president declined to comment on the complaint, saying that administrators had not yet had time to review it.