York S1-025-30889-000 Transformer Tamper Prevention: Allows the main

Tamper Prevention: Allows the main control to be mounted in a secure utility room while sensing the actual living or workspace temperature

For 1k ohm nickel sensors

It is not intended for use with Hytrel high-torque sleeves

Skin oils create hot spots that lead to premature failure

Broad Compatibility: Fits a wide range of models including Weil McLain Ultra Series 2

York S1-025-30889-000 Transformer Tamper Prevention: Allows the mainThe York S1 025 30889 000 Transformer is a heavy duty OEM HVAC control transformer engineered to step down 120V primary voltage to a stable 24V secondary output. Rated at 40VA and operating at 50 60Hz, this component provides essential low voltage power for thermostats, ignition modules, contactors, and integrated furnace control boards. Its foot mount design ensures a secure installation within the cabinet, while the spade terminal connections