Siemens 550-405 ATEC VAV Variable Air Volume Controller, With Reheat Controller [Refurbished]

The ATEC (Actuating Terminal Equipment Controller) Variable Air Volume Controllers provides high performance direct digital control (DDC) of pressure-independent, variable-air-volume zone level routines. The ATEC controllers can operate stand-alone or can be networked to perform complex HVAC control, monitoring and energy management functions. The ATEC controllers are designed to reside on any Siemens control system.. Siemens. Siemens. 550-405.