Lochinvar & A.O. Smith 100208514 Relay

The Lochinvar & A.O. Smith 100208514 Relay is a critical 24V electromagnetic control designed for precise low-voltage circuit switching in commercial and residential hydronic systems. As the direct replacement for RLY2903, this OEM component ensures seamless HVACR system compatibility when interfacing between thermostat controllers and high-load mechanical parts. This 24VAC relay is frequently utilized in boiler control boards and water heater wiring assemblies to manage the activation of circulator pumps, burner ignition sequences, and safety limits. By effectively isolating control logic from power-heavy operations, the 100208514 relay prevents electrical overload and stabilizes voltage distribution across the control transformer circuit. For veteran technicians, this DPDT or SPDT relay configuration (variable by application) offers a rugged solution for troubleshooting non-functional blowers or intermittent combustion cycles. Its compact design facilitates quick installation within tight electrical control boxes, maintaining the operational integrity expected in Lochinvar Knight or A.O. Smith Cyclone series equipment.

• OEM Precision: Specifically engineered as the direct replacement for RLY2903, ensuring exact physical fit and electrical ratings.
• System Protection: Effectively manages 24V signal switching to prevent damage to sensitive integrated control boards.
• Versatile Application: Robust enough for pump relays, fan controls, and auxiliary signal management in industrial water heaters.
• Enhanced Durability: Built for high-frequency cycling, reducing the necessity for repetitive service calls due to contact failure.

Is the 100208514 compatible with older RLY2903 installations?
Yes, the 100208514 is the official superseding part number for the RLY2903. It maintains the same 24V coil voltage and terminal configuration for a seamless drop-in replacement.

Which HVACR systems use this 24V relay?
This Lochinvar relay is standard in various high-efficiency boilers and commercial water heaters, typically used to trigger inducer motors or system pumps via a 24-volt command.

Can this relay replace a generic 24V switching relay?
While technical specs may align, using this genuine Lochinvar & A.O. Smith part ensures your BTU output and safety timings remain within the original manufacturer’s design parameters.

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.