Trane BUS1909 Bushing 321894-709 note that the wiring configuration

note that the wiring configuration has been updated

the burner assembly should be checked for physical degradation

Rugged Construction: The UL94-5V flammability rating allows for safe installation in return air plenums and high-traffic commercial environments

It functions as a 120V to 24V step-down HVAC transformer

Trane BUS1909 Bushing 321894-709 note that the wiring configurationThe Trane BUS1909 is a 1 inch Type H Split Taper Bushing designed for precision mounting of sheaves, pulleys, and sprockets in commercial HVACR drive systems. This split taper bushing features a high strength design that provides 360 degree clamping force, ensuring a secure, concentric fit on the shaft to minimize vibration and run out. As a genuine OEM Trane replacement part (also referenced as BUS01909), it is engineered to handle high torque