The situation that prompted the statement by the Public Workers Union happened on Nov. 19.
According to the union, workers on an understaffed ward were told to put restraints on a combative patient.
Five workers supervised by a nurse took that patient to a room where they put him face down on a bed with his arms and legs strapped down. The patient was in that position for about an hour.
One worker involved was fired. Six other were placed on investigative leave.
The incident follows a late opening for the new facility in Butner. Doors opened in July after several delays linked to safety concerns and design problems.