... Max.25 normally-open contact devices. One built-in, Style Y (Class B) Notification Appliance (Signal) Circuits (NACs). Alarm, ... smoke detectors, heat detectors, manual pull stations, audible warning devices, and a fire alarm control with remote notification capability ... detectors, pull stations and other normally-open contact devices. Outputs include one Notification Appliance Circuits(Sounder 1), ...