Xylem's Technologic pump controller variable frequency drive (VFD) combines the start-up Genie and an electronically controlled bypass for hydronic HVAC system applications. The Technologic drive features 10 preconfigured applications, preset pump protections and input/output options. A built-in auto set mode is available that remembers previously set parameters. The Technologic allows to alter hydraulic performance to maintain constant system pressure for applications with varying flow ranges. The drive provides constant speed lag control and the ability to control one variable speed pump with up to two fixed speed lag pumps triggered by relay. The bypass option with electronic control ensures uninterruptible operation of the HVAC system by keeping the rotating equipment running.