and American water heater systems

reducing the number of truck-stock SKUs required for field service

protecting the compressor motor from excessive load during "hot starts" or high ambient conditions

provided the operating pressure does not exceed 450 PSI

Resideo AT87A1189 Transformer 321894-709 and American water heater systemsThe Resideo AT87A1189 Transformer is a heavy duty 277V to 24V control transformer engineered for reliable power delivery in commercial HVACR and building automation systems. Built to handle 48VA loads, this unit features a 277V primary and provides a precise 26. 5 V. O. C. secondary output to ensure stable performance for 24VAC control circuits, driving relays, or powering digital I O components. As a NEMA Type E transformer, it integrates energy