Lennox 11J14 SPST Pressure Switch 0.75" WC

The Lennox 11J14 is a genuine OEM single pole single throw (SPST) pressure switch designed for reliable air pressure monitoring in Lennox furnaces and HVAC systems. This safety control device features a 0.75 inch water column (WC) pressure rating and ensures proper furnace operation by monitoring the pressure differential created by the draft inducer motor.

Key Features:

• Pressure rating: 0.75" WC (water column)
• SPST (Single Pole Single Throw) configuration for simple on/off switching
• Genuine Lennox OEM replacement part
• Direct replacement for part number 93W89
• Durable construction for long-lasting performance
• Safety control device that prevents furnace operation when proper draft pressure is not detected

This pressure switch plays a critical role in furnace safety by monitoring the air pressure generated by the draft inducer. When proper pressure is achieved, the switch closes its electrical contacts, allowing the furnace to proceed with its heating cycle. If adequate pressure is not detected, the switch remains open, preventing ignition and protecting against unsafe operating conditions such as blocked venting or improper combustion air flow.