Lennox 22J51 Relay-Sequencer

The Lennox 22J51 Relay-Sequencer is a critical 24V control component designed to manage the staged activation of heating elements and blower motors in electric furnaces and air handlers. For technicians performing field repairs, the 22J51 serves as the direct replacement for R76726700, ensuring seamless integration with existing Lennox and Allied Air equipment. This HVAC sequencer utilizes factory-calibrated time delays to prevent electrical overloads and nuisance tripping by staggering the inrush current of high-wattage heating elements. Built for robust performance in residential and light commercial applications, it features a multi-switch relay design that supports staged heating control, maintaining optimal system efficiency and consistent discharge air temperatures. This OEM replacement part is engineered to meet 100 Megaohm insulation resistance standards, providing a reliable on-off operation mode for high-voltage circuits up to 240V and 25A. With its compact footprint and universal quick-connect terminals, the Lennox 22J51 reduces downtime during electric furnace repair and restores precise sequencing logic to the air handler.

• Direct OEM Compatibility: Specifically engineered as the direct replacement for R76726700 and compatible with Lennox model 89W50 and various Allied Air, AirEase, and Ducane units.
• Staged Element Activation: Features precise timed sequencing to stagger the load of heating elements, protecting the electrical service and internal wiring from high inrush current.
• High Electrical Integrity: Rated for 240V and 25A applications, supporting a maximum wattage of 10KW for reliable electric heat control.
• Streamlined Installation: Compact design with standard quick-connect connectors allows for fast, plug-and-play replacement in tight control cabinets.
• Operational Efficiency: Provides consistent on-off operation and automatic control, reducing component wear and improving overall energy conservation.

What are the standard timing specifications for the 22J51?
The relay features factory-set delays (typically 1–110 seconds) that determine when the heating elements and blowers engage or disengage, ensuring the blower remains active until the heat exchanger has cooled.

Can I use the 22J51 to replace other sequencer brands?
While this is a Lennox 22J51 Relay-Sequencer, it is a common 14SH22 type that replaces several part numbers, including R76726700, 22J5101, and 76727600. Always verify the terminal configuration before installation.

Is this sequencer suitable for 120V systems?
This specific model is primarily designed for 24V control circuits with 240V load ratings. Using it outside of its specified voltage range can lead to premature component failure or safety hazards.

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.