The Fireye NXF4000 control is an advanced combustion efficiency control system for all types of combustion systems, with an integrated flame safeguard. Best-in-class support for four fuel profiles allows these controls to accommodate a large variety of applications. Up to ten servos can be connected in total, with three sizes available: 4Nm (3 ft.-lb.), 20Nm (15 ft.-lb.) and 50Nm (37 ft.lb.). Four available fuel profiles with up to four connected servos per profile Ten servos can be connected in total with non-monotonic operation Three servo choices: 4Nm (3 ft.-lb.), 20Nm (15 ft.-lb.) and 50Nm (37 ft.lb.) Built-in 24VDC power supply for servos, user interfaces and accessories Internal flame safeguard functionality w/ IR or UV amplifiers for use with standard flame scanners Available with direct-coupled amplifier for use with integrated flame scanners Intelligent valve proving for two- or three-valve systems Input option for airflow switch test Input option for fuel valve proof of closure Five 4-20mA analog inputs are available 15 programmable line-voltage digital inputs available One user-defined 4-20mA analog output is available 3 user-defined line-voltage digital outputs available Optional VFD interface card adds allows up to two VFDs to be connected, with 4-20mA or encoder feedback and up to two user-defined 4-20mA analog output. Two optional O2 trim probes available (standard and high temperature) for monitor and control Boiler efficiency calculation available with optional O2 trim Thermal shock algorithm is available for cold starts Up to six boilers can be connected for peer-to-peer sequencing Internal PID load control is available for precise steam or hot water setpoint control External 4-20mA signal can be connected for direct control by building automation or PLC Hot standby function can be used to maintain a hot water setpoint so boiler is always ready to make steam quickly SD card slot for backup and restore parameters (standard SD included in carton) Modbus RTU via RS-485 for connection to building automation or PLC BACnet/IP, BACnet MS/TP and Ethernet/IP available via MB485ETH-CG gateway Standard 4.3” touchscreen user interface with virtual four-line display and function buttons Optional 7” or 12” touchscreen user interface with Modbus TCP server, remote VNC viewer and additional features can be used with or in place of 4.3” user interface Small footprint with no wiring base (integrated terminal blocks) Expert support from the Adaptive HVAC Supply team