The Flex 505 is a five-zone fire alarm control panel (FACP) and the Flex 510 is a ten zone FACP. These combination control and digital communicator panels provide reliable fire signaling protection for medium-sized commercial, industrial and institutional buildings. Initiating Device Circuits (IDCs) for Flex Series panels are programmable and operate in Class B (Style B). Each panel is compatible with conventional input devices such as two-wire smoke detectors, four wire smoke detectors, pull stations, water flow devices, tamper switches and other normally open contact devices. This includes System Sensor i3™ Series microprocessor-based detectors with advanced features, like drift compensation, maintenance alert and freeze warning. (See the GamewellFCI Device Compatibility Document, P/N 52195, for a listing of compatible devices). Outputs include four Notification Appliance Circuits (NACs), three programmable Form-C relays (factory pre-set for Alarm, Trouble and Supervisory), and resettable and non resettable power (24 VDC) for special applications. NACs are Class A power limited and operate in Class B (Style Y). The FACP supervises wiring, AC voltage and battery level.