York S1-2940A3541 Transformer

The York S1-2940A3541 Transformer is a critical component for maintaining consistent 24V control voltage across residential and light commercial HVAC systems. This 120V primary 24V secondary step-down transformer is engineered to handle a 40VA power rating, providing sufficient overhead for contactors, boards, and thermostats within the control circuit. As a direct OEM York furnace transformer replacement, it ensures the internal impedance and thermal protection matches the original equipment specifications, preventing the nuiscance tripping or voltage drops often associated with generic multi-tap alternatives. The S1-2940A-3541 cross-reference confirms it is the identical service part for a wide range of York, Luxaire, and Coleman air handlers and furnaces. For contractors, the footprint and terminal layout allow for a drop-in installation, maintaining the integrity of the HVAC control circuit transformer system without the need for additional mounting brackets or field modifications.

• OEM Compatibility: Precision-matched for York/Johnson Controls equipment to ensure proper inductive load handling.
• Circuit Stability: Delivers a steady 24VAC output to protect sensitive solid-state ignition boards and communicating modules.
• Durable Construction: High-grade copper windings and laminated steel core resist internal heat buildup during high-demand cycles.
• Simplified Wiring: Color-coded leads or standard terminal configurations facilitate rapid field replacement.

What was the most common cause of failure for the York S1-2940A3541?
Most failures in these units result from a short in the 24V secondary circuit, often located at the outdoor contactor coil or a rubbed-through thermostat wire. Always verify the amp draw on the secondary side before energizing the new transformer.

Can I use a 50VA transformer instead of this 40VA unit?
While a higher VA rating provides more capacity, the S1-2940A3541 is sized specifically for the original control load. Expanding capacity without addressing a primary short will not solve underlying circuit issues.

Is the S1-2940A3541 interchangeable with the S1-2940A-3541?
Yes, these part numbers are identical. The hyphenation is simply a variation in cataloging between different distributor databases.

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.