Lochinvar & A.O. Smith 100288473 Transformer

The Lochinvar & A.O. Smith 100288473 Transformer is a heavy-duty, 100VA step-down component engineered for commercial and industrial HVACR applications. Designed to convert 120V primary line voltage to a stable 24V secondary output, this transformer provides the high-amperage capacity required to power complex control strings, multiple contactors, and high-draw smart thermostats without inductive voltage sag. This OEM part is a direct replacement for various Lochinvar and A.O. Smith boiler and water heater models, including the CHN1802 and CHL2072 series. Its 100VA power rating offers a significant overhead advantage compared to standard 40VA or 75VA units, ensuring reliable operation of integrated control boards and safety circuits even under high demand.

• High VA Capacity: The 100VA rating supports advanced control systems and multiple low-voltage accessories without overheating the windings.
• Precise Voltage Conversion: Maintains a steady 24V output from a 120V source to protect sensitive HVAC control boards and integrated circuits.
• OEM Compatibility: Specifically designed for Lochinvar boilers and A.O. Smith water heaters, ensuring correct mounting and terminal alignment.
• Industrial Durability: Robust construction minimizes harmonic noise and vibration, common failure points in lesser-grade transformers.

• Can I use this to replace a 40VA or 75VA transformer? Yes, you can typically upgrade to a higher VA rating like this 100VA unit if the primary and secondary voltages match, providing more "headroom" for the system.
• What causes this transformer to fail? Most failures are secondary-side events, such as shorted contactor coils, damaged thermostat wiring, or exceeding the 100VA load limit. Always verify the 24V circuit for shorts before installing the replacement.
• How do I test if this part is defective? Use a multimeter to confirm 120V at the primary terminals. If primary power is present but there is no 24V output at the secondary, the internal windings are likely open.

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.