Jans has been Wichita State's associate head coach since 2011-12. He helped guide the Shockers to three straight NCAA appearances and to an unbeaten record and No. 2 ranking this season before a loss to Kentucky on Sunday in the NCAA tournament. He spent seven years at WSU.
Orr was fired March 11 after seven years. The Falcons went 12-20 this season.
Jans also has been an assistant at Illinois State, Idaho, Grand View (Iowa) and Elmhurst (Ill.). He was a head coach at Kirkwood (Iowa) Community College, winning a junior college national championship in 1997-98, in addition to Independence (Kansas) CC, Howard (Texas) College and Chipola (Fla.) JC.