Lochinvar & A.O. Smith 100208509 Power Relay

The Lochinvar & A.O. Smith 100208509 Power Relay is a heavy-duty 120V HVAC replacement relay engineered for high-demand switching in commercial boilers and water heating systems. This OEM power relay functions as a critical control interface, managing the distribution of 120VAC line voltage to essential components such as circulator pumps, air blowers, and high-limit safety circuits. Rated at 10.8 Amps and 60 Hz, this component is designed for precise inductive load management, ensuring that your HVAC control system maintains stable electrical continuity under varying thermal conditions. This specific part is a direct, drop-in replacement for legacy part numbers RLY2706 and RLY2706K, maintaining exact mounting footprints and terminal alignments to minimize downtime during field service.

For technicians servicing A.O. Smith water heaters or Lochinvar Armor and Crest boilers, the 100208509 provides the rugged durability required for high-cycle applications. Whether you are performing a boiler relay replacement or troubleshooting a 120V power relay wiring fault, this unit ensures reliable contact closure and arc suppression. Professionals should verify coil resistance and contact continuity as part of standard HVAC relay troubleshooting to prevent premature failure of downstream motors and ignition controls.

Key Benefits:

• Universal Compatibility: Serves as the official replacement for part numbers RLY2706 and RLY2706K in diverse HVAC platforms.
• Industrial Grade Ratings: Designed for 120VAC 60Hz operation with a robust 10.8A capacity for handling inductive motor loads.
• Optimized Heat Dissipation: Constructed to withstand the high ambient temperatures common in commercial boiler rooms and air handler cabinets.
• OEM Reliability: Ensures exact electrical timing and switching characteristics required by Lochinvar and A.O. Smith factory specifications.

Common Questions:

• How do I identify a failing 100208509 relay? Look for signs of carbon tracking or pitted contacts, or use a multimeter to check for an open coil or high resistance across closed terminals.
• Can I use this to replace a RLY2706K? Yes, the 100208509 is the current, identical replacement for both RLY2706 and RLY2706K.
• What systems use this 120V power relay? It is primarily found in Lochinvar Knight and Armor boilers as well as various A.O. Smith commercial water heaters to control pumps and fans.

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.