Description
Lennox 10U93 SPST Pressure Switch Overview
The Lennox 10U93 is an OEM-grade Single-Pole Single-Throw (SPST) pressure switch engineered to protect and regulate your heating system with precision. Calibrated to a 0.65″ water column (w.c.) setpoint, this switch monitors draft pressure within the furnace venting system to confirm that the inducer motor is operating correctly before allowing ignition to proceed — a critical safety function in modern gas furnaces.
Key Features
- OEM Lennox replacement part — SKU 10U93
- Single-Pole Single-Throw (SPST) switching configuration
- Calibrated setpoint: 0.65″ water column (w.c.)
- Monitors inducer/draft pressure to prevent unsafe ignition
- Designed for direct OEM fit in compatible Lennox furnace models
- Helps maintain system efficiency and protects against combustion hazards
How It Works
The pressure switch senses negative pressure (vacuum) generated by the draft inducer blower. When the inducer reaches the correct operating speed and the pressure differential meets or exceeds the 0.65″ w.c. threshold, the SPST switch closes, signaling the furnace control board to continue the ignition sequence. If adequate pressure is not detected, the switch remains open, locking out ignition and alerting the system to a potential venting or inducer fault.
Application
This switch is a direct OEM replacement for compatible Lennox gas furnace models. Always verify compatibility with your specific furnace model number before installation. Consult the equipment service manual or contact a qualified HVAC technician to confirm the correct pressure switch for your application.
Why Choose OEM?
- Exact calibration to factory specifications
- Reliable fit and function — no modifications required
- Supports warranty compliance and system integrity
- Reduces callbacks and repeat service visits
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