York S1-025-15798-700 Transformer

The York S1-025-15798-700 Transformer is a heavy-duty, commercial-grade 250VA control transformer engineered for precision voltage regulation in demanding HVACR environments. Designed to handle dual primary voltages of 240V or 480V, this unit provides stable stepped-down secondary outputs of 120V or 140V. As an authentic HVAC OEM replacement part, it ensures seamless integration with York and Johnson Controls rooftop units and air handlers, maintaining the electrical integrity of control modules, contactors, and high-impedance circuits. The 250VA power rating offers a robust safety margin for transformer voltage conversion in systems where standard 40VA or 75VA units would fail under inductive load. When replacing a York S1-02515798700, verify your primary lead configurations to match the specific 240/480 multi-tap requirements of your application. This industrial-spec transformer is built to withstand the thermal stressors common in 60Hz industrial HVAC electrical systems, ensuring long-term reliability for field service technicians and mechanical contractors.

• Multi-Tap Input Versatility: Supports both 240V and 480V primary configurations, reducing the need to carry multiple SKUs for different site voltages.
• High Power Capacity: Rated at 250VA to handle larger control circuit loads, including multiple relays and electronic control boards.
• Precise Secondary Output: Clean 120V/140V delivery prevents control logic errors and chatter in high-voltage contactors.
• Industrial Durability: Constructed to meet strict York OEM specifications for heat dissipation and coil insulation.

What are the secondary voltage options for this York transformer?
The secondary side provides both 120V and 140V taps, allowing for precise voltage matching based on the requirements of the downstream control components.

Can this 250VA transformer replace a lower VA unit?
Yes, you can safely use a higher 250VA rated transformer like the S1-025-15798-700 to replace a unit with a lower VA rating (such as 150VA), provided the physical dimensions and voltage taps align.

Is this transformer compatible with 50Hz systems?
This specific model is optimized for 60Hz operation. Using it in 50Hz environments may lead to increased core temperatures and potential performance degradation.

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.