The Trane MOD03322 Tracer Control Module UC400 is a programmable building automation controller designed for compatible Trane HVAC systems. It monitors connected sensors and equipment inputs, processes control commands, and manages outputs to regulate system functions. Commonly used with air handlers, fan coil units, rooftop units, and other commercial HVAC equipment, it supports auto... https://www.partshnc.com/mod03322-trane-tracer-control-module-uc400