Description
Lennox 14A57 Two-Stage Pressure Switch
The Lennox 14A57 is an OEM-grade two-stage pressure switch engineered for use in Lennox gas furnaces and heating systems. Designed to monitor inducer and combustion air pressure, this switch provides critical safeguard functionality by verifying proper draft and venting conditions before allowing the burner to fire — protecting both the equipment and the occupants.
Two-Stage Operation
This pressure switch features dual setpoints to support two-stage furnace operation:
- Stage 1 setpoint: -0.50 in. W.C.
- Stage 2 setpoint: -0.80 in. W.C.
Each stage independently confirms adequate negative pressure from the inducer motor, ensuring safe and efficient combustion at both low- and high-fire operation.
Key Features
- OEM Lennox replacement part — direct-fit for compatible Lennox furnace models
- Two-stage design with -0.80 and -0.50 in. W.C. pressure setpoints
- Monitors inducer/draft pressure to prevent unsafe furnace operation
- Helps protect heat exchanger integrity and prevent flue gas spillage
- Reliable switching action for consistent system performance
Application
The 14A57 pressure switch is a direct OEM replacement for select Lennox two-stage gas furnaces. Always verify compatibility with your specific furnace model number before installation. Consult the equipment service manual for proper wiring and mounting procedures.
Why Choose OEM Lennox Parts?
Using genuine Lennox replacement components ensures proper fit, reliable operation, and maintained equipment warranty compliance. The 14A57 is built to the same specifications as the original factory-installed switch, giving you confidence in every installation.
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