Lennox 14B05 Sequencer Relay

The Lennox 14B05 Sequencer Relay is a high-performance 24V N/O electro-mechanical control designed for precise electric heat sequencing in residential and commercial air handlers. As the direct OEM replacement for 14B0501, this Therm-O-Disc 15S2 series component features a Class D configuration with a single-timing operation. Technicians rely on this unit to manage critical HVAC part compatibility across various Lennox furnace and heat pump models, including those requiring the 42A64 and P-8-9112 legacy equivalents. The 14B05 is engineered to prevent electrical surges by staggering the activation of heating elements with a 60-second ON delay and a 45-second OFF delay. This sequencer relay ensures stable terminal connections and helps maintain HVAC system efficiency by reducing the high inrush current typically associated with simultaneous multi-stage element activation. Its compact design and Normally Open contact configuration simplify integration into existing control circuits, providing reliable thermal switching for 50/60 Hz applications.

• Broad Compatibility: Direct OEM replacement for 14B0501, 14B0501, 42A6401, and 38671, ensuring a drop-in fit for Lennox air handlers and furnaces.
• Optimized Timing: Integrated time delay mechanism (60s ON / 45s OFF) protects electrical circuits from overloads and reduces mechanical wear.
• Heavy-Duty Construction: Features Class D insulation and normally open contacts rated for demanding HVACR environments.
• Enhanced System Stability: Staggers power delivery to high-amperage heating elements, minimizing voltage drops and flickering lights during startup.

• Will the 14B05 replace my older 14B0501 unit? Yes, the 14B05 is the current updated version and is fully compatible with all equipment originally using the 14B0501 part number.
• What is the control voltage for this relay? This is a 24V furnace sequencer, requiring a standard 24-volt transformer output for the control coil.
• Can this be used for multi-stage heating? While this is a single-timing sequencer, multiple relays can be wired in parallel or series as per the original equipment manufacturer's wiring diagram to achieve staged heating.

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.