Description
The Lennox 63K93 is a factory-specified pressure switch engineered for precise draft and airflow monitoring in Lennox heating systems. Calibrated to a set point of .20″ water column (wc), this switch reliably detects proper inducer operation before allowing burner ignition — a critical safety function that protects against flue gas spillage and incomplete combustion.
Key Features
- Set point: .20″ water column (wc) for accurate differential pressure sensing
- SPST (Single-Pole, Single-Throw) switching configuration for straightforward circuit integration
- Dual 1/4″ barb connections for secure, leak-free hose attachment on both pressure ports
- OEM Lennox replacement part — direct drop-in fit for compatible Lennox furnace models
- Monitors inducer blower performance to confirm adequate draft before burner ignition
- Helps prevent unsafe furnace operation due to blocked flue, failed inducer, or restricted venting
Application
Designed as a direct OEM replacement for Lennox gas furnaces, the 63K93 pressure switch integrates seamlessly into the furnace control circuit. When the inducer motor generates sufficient negative pressure, the switch closes and signals the control board to proceed with ignition. If draft is inadequate, the switch remains open, locking out the burner and alerting the system to a potential venting issue.
Specifications
- Brand: Lennox
- Part Number / SKU: 63K93
- Set Point: .20″ w.c.
- Switch Type: SPST
- Connection Type: Dual 1/4″ barb
Why Choose the Lennox 63K93?
Using the correct OEM pressure switch ensures your Lennox furnace operates within factory-specified safety parameters. The 63K93 delivers the precise switching action and pressure calibration required to maintain reliable, code-compliant operation — making it the preferred choice for HVAC technicians performing warranty-quality repairs.
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