Lennox 31W67 Relay Sequencer

The Lennox 31W67 Relay Sequencer is a critical multi-staged control component designed for electric furnace sequencer replacement and HVAC system timing management. This HVAC sequencer relay functions as a technical conductor, utilizing a stacked relay design to coordinate the activation of heating elements, blowers, and compressors in a precise sequence of operation. By staging electrical loads, the 31W67 prevents circuit overloads and nuisance breaker tripping during the initial heat call, ensuring that high-amperage components engage incrementally rather than simultaneously.

Engineered for high-duty residential and commercial applications, this 24V sequencer provides reliable switching for electric heat strip staging and fan control. Its compact, robust construction allows for seamless installation in tight control cabinets, while the Lennox 31W6701 specifications ensure compatibility across a broad range of legacy and modern Lennox units. Technicians can rely on this part for consistent timing intervals, maintaining optimal airflow and temperature rise across the heat exchanger for enhanced system performance.

• Load Staging: Prevents electrical surges by staggering the activation of heating elements and auxiliary components.
• OEM Compatibility: Exact drop-in replacement for Lennox 31W67 and 31W6701, ensuring terminal alignment and wiring consistency.
• Stacked Design: Efficient multi-relay configuration reduces the physical footprint within the furnace control compartment.
• System Protection: Minimizes wear on contactors and transformers by regulating the timing of high-draw electrical circuits.

• How do I test the 31W67 for failure? Use a multimeter to check for 24V at the heater coil terminals. If voltage is present but the normally open contacts do not close within the specified timing window, the internal bimetal or heater has failed.
• Why is my furnace short cycling or failing to hit temperature? A faulty sequencer may fail to engage all heating stages. Inspect for pitted contacts or high voltage drop across the terminals while under load.
• Can this relay control the blower fan? Yes, the 31W67 is designed to manage both the heat elements and the blower timing to ensure the fan runs until the residual heat is dissipated.

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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.