Lochinvar & A.O. Smith 100208505 Relay

The Lochinvar & A.O. Smith 100208505 Relay is a mission-critical 120V electrical component engineered for high-demand hydronic heating and water heating systems. As a direct OEM replacement for discontinued part numbers RLY2425 and RLY2425K, this 120V power relay ensures seamless logic control and circuit management within the burner control string. Designed for maximum reliability in both residential and commercial boilers, the 100208505 relay is frequently utilized in high-efficiency series including the Lochinvar Copper-Fin and Knight models.

When troubleshooting ignition sequences or pump delays, this industrial control relay provides the precise switching required to interface with the integrated control board. Its robust construction is built to withstand the thermal cycling common in mechanical rooms, preventing premature contact pitting and ensuring consistent voltage delivery. For contractors performing preventative maintenance or emergency repairs, verifying the Lochinvar 100208505 compatibility ensures the system maintains its original engineering specifications without the risk of electrical mismatch from generic alternatives.

• Exact OEM Match: Functionally identical to RLY2425 and RLY2425K, eliminating the need for field modifications or bracket adjustments.
• Universal Application: Rated for 120V operation, making it compatible with a wide range of A.O. Smith and Lochinvar water heaters and boilers.
• Enhanced Durability: Heavy-duty contact design reduces arcing and extends the service life of the heating control circuit.
• Critical Safety Integration: Acts as a reliable interface for safety limits and operating controls to ensure safe burner performance.

Is the 100208505 compatible with older Copper-Fin models?
Yes, this 120V relay is the designated replacement for the RLY2425 series commonly found in Copper-Fin CH and CF models (990-2070) and is a standard part for modern AHRI-rated equipment.

Can I use a 24V relay in place of the 100208505?
No. This is a 120V rated component. Installing a 24V coil relay in a 120V circuit will cause immediate component failure and potential damage to the control board.

How do I confirm if my RLY2425K needs replacement?
Technicians should check for continuity across the coil and verify that the contacts close securely when energized. If you see visible carbon buildup or hear "chattering" during the ignition cycle, the relay should be replaced.

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.