Description
The Lennox 73W76 is an OEM-grade pressure switch engineered for reliable draft and airflow proving in Lennox furnace and air handler applications. With a precisely calibrated set point of -0.50″ water column (wc), this single-pole single-throw (SPST) switch monitors negative pressure in the flue or inducer circuit and interrupts the control sequence if safe operating conditions are not met — protecting both equipment and occupants.
Key Features
- Set Point: -0.50″ water column (wc)
- Switch Type: SPST (Single-Pole, Single-Throw)
- Port Connection: 1/4″ barb fitting for secure hose attachment
- Direct OEM replacement for compatible Lennox furnace models
- Monitors inducer/draft pressure to verify safe combustion airflow
- Interrupts ignition sequence upon detection of unsafe pressure conditions
How It Works
The 73W76 pressure switch is connected via a 1/4″ barbed hose port to the inducer motor housing or collector box. When the inducer establishes proper negative draft pressure at or beyond the -0.50″ wc threshold, the SPST contacts close, signaling the control board to proceed with the ignition sequence. If the required pressure is not achieved — due to a blocked flue, failed inducer, or restricted vent — the switch remains open, locking out the system and preventing unsafe operation.
Application
- Lennox gas furnaces requiring a -0.50″ wc pressure switch
- Inducer and draft proving circuits
- Direct OEM replacement — no modifications required
Why Choose the Lennox 73W76
Using a genuine Lennox OEM pressure switch ensures exact calibration, proper fit, and reliable performance. Aftermarket substitutes may carry different set points or connection tolerances that compromise system safety and efficiency. The 73W76 is the correct, manufacturer-specified component for applicable Lennox equipment.
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