York S1-025-30889-000 Transformer

The 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 facilitate rapid, vibration-resistant wiring for the service technician. This genuine York replacement part is built to original factory specifications, supporting proper current draw and preventing common low-voltage circuit failures in compatible York, Source 1, and Johnson Controls units. By utilizing a 120V to 24V step-down ratio, it protects sensitive electronics from line-voltage fluctuations, ensuring the logic circuits and safety strings remain energized for reliable equipment cycling.

Key Benefits for HVAC Professionals

• Direct OEM Match: Ensures exact physical mounting and electrical compatibility with York and affiliated systems, eliminating the need for field modifications.
• Industrial Build Quality: High-efficiency windings and durable foot-mount base provide long-term stability in high-temperature HVAC environments.
• Standardized Connectivity: Equipped with industry-standard spade terminals for fast, plug-and-play installation during emergency service calls.
• Precise Power Regulation: Delivers a consistent 24VAC signal, which is critical for the reliable operation of digital thermostats and modern communicating control boards.

Common Questions

Is the York S1-025-30889-000 a suitable replacement for other 40VA transformers?
Yes, provided the primary input is 120V and the footprint allows for a foot-mount configuration. This OEM transformer is specifically optimized for York equipment but follows standard electrical ratings for 40VA HVAC control circuits.

What causes a 24V transformer like the S1-025-30889-000 to fail?
Most failures occur due to a direct short in the low-voltage wiring (such as a frayed thermostat wire) or a high amp draw from a failing contactor coil. Always verify that the secondary circuit load does not exceed the 40VA rating before installation.

Does this part support 50Hz and 60Hz systems?
Yes, this York control transformer is designed for 50/60Hz operation, making it versatile for various regional power applications without overheating.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.