The AHU controller supported an optional ZTU Zone Terminal Unit, which is not compatible and cannot be used with FAC and CGM controllers. You can partially duplicate the Zone Terminal functionality by replacing it with a DLK0350 or a DIS1710 Local Controller Display. However, the DIS1710 does not provide access to real-time clock functions such as scheduling, trending, and alarming. The DLK0350 provides access to local trends and alarms, but does not currently support schedules.