The ECL-VAV controllers are microprocessor-based programmable variable air volume (VAV) controllers designed to control cooling only, cooling with reheat, dual duct, parallel fan and series fan VAV boxes. This updated 12-point VAV controller includes a robust hardware design, a drift-free NoZero calibration airflow sensor, extended power daisy-chaining performance, smart room control support and preloaded applications, all of which helping to streamline installation and commissioning time. Each controller uses the LonTalk® communication protocol and is LONMARK certified as an SCC VAV.