High-Cycle Reliability: Engineered to withstand the frequent startup cycles of gas-fired unit heaters

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

and American water heater systems

this EPDM-based diaphragm ensures consistent seal integrity and terminal equipment control in demanding HVAC environments

it includes a 1/2" pipe thread element with a 3-3/8" bulb extension and a 3/4" bushing to accommodate standard immersion well requirements

Resideo AT87A1189 Transformer 321894-709 High-Cycle Reliability: Engineered to withstandThe 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