Lochinvar & A.O. Smith 100208251 Transformer

The Lochinvar & A.O. Smith 100208251 Transformer is a critical OEM replacement part designed for high-efficiency hydronic systems. This 75VA control transformer steps down 120V primary power to a stable 24V secondary output, providing the necessary low-voltage power supply for integrated boiler control boards and secondary circuits. As a direct equivalent to TRF2005 and TRF2005K, this component ensures seamless HVAC voltage conversion and system communication. Verified for use in Lochinvar Copper-Fin II series, including models CB497 to 747 and CW497 to 747, it maintains the precise electrical overhead required for commercial water heaters and boilers. For technicians performing HVAC transformer troubleshooting, this unit offers a robust 60 Hz frequency rating and durable foot-mount construction to withstand high-demand mechanical room environments. Prioritize genuine Lochinvar parts to maintain circuit integrity and prevent premature board failure associated with inconsistent voltage drops.

• Universal Compatibility: Engineered as a drop-in replacement for part numbers 100208251, TRF2005, and TRF2005K.
• High Power Capacity: Featuring a 75VA rating, it provides ample head-room for multiple 24V accessories and control logic.
• Precise Electrical Specs: Converts 120V-PRI to 24V-SEC to meet the strict input requirements of A.O. Smith and Lochinvar ignition modules.
• Industrial Build: Designed for continuous duty in Lochinvar Copper-Fin II boilers and water heating systems.

• Can I use this to replace a 40VA or 50VA transformer? Yes, the 75VA capacity provides more power and is a safe upgrade for lower-rated 24V control circuits, provided the physical mounting matches.
• Is this transformer compatible with both boilers and water heaters? Absolutely. It is specified for Copper-Fin II models CB497-747 (boilers) and CW497-747 (water heaters).
• Does this include a built-in circuit breaker? Most 100208251 units are standard control transformers; always verify your specific board protection requirements during installation.

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.