Resideo AT40A1139 Transformer R-407A Environmental Resilience: Features a rugged

Environmental Resilience: Features a rugged housing designed to withstand extreme thermal cycles from -40°F to 190°F without calibration drift

flow enters from both Port II (A) and Port III (B) and exits through Port I (AB)

The M9208 series is a preferred choice for contractors requiring a 55-71 second power-on run time and precise mechanical fail-safe positioning

Nuisance Lockout Prevention: Provides a stable signal to the ignition module

The Utica-Dunkirk 14627020 Tankless Coil is a precision-engineered OEM replacement part designed for integration into oil-fired cast iron boilers

Resideo AT40A1139 Transformer R-407A Environmental Resilience: Features a ruggedThe Resideo AT40A1139 Transformer is a heavy duty 40VA power supply designed for reliable 24V control circuits in residential and light commercial HVACR applications. Engineered with a 240V primary and a 26. 5V secondary output, this NEMA Type D transformer ensures consistent voltage regulation for thermostats, zone valves, and gas valves. The channel frame mounting configuration allows for versatile installation directly onto a junction box or