Description
The Lennox 93W84 is an OEM pressure switch engineered to monitor and protect the draft inducer circuit in Lennox heating systems. By sensing negative pressure at two critical set points — .35″ WC and .50″ WC — this switch confirms that proper airflow and venting conditions exist before allowing the furnace to advance through its ignition sequence, helping prevent unsafe or incomplete combustion.
Key Features
- Dual set-point design: .35″ WC and .50″ WC operating thresholds
- OEM Lennox replacement part (SKU 93W84) for precise fit and function
- Monitors inducer motor draft pressure to verify safe venting conditions
- Prevents furnace ignition if adequate airflow is not confirmed
- Designed for direct, drop-in replacement in compatible Lennox furnace models
- Durable construction for long-term reliability in demanding heating environments
How It Works
The pressure switch is connected via a rubber hose to the inducer motor housing. When the inducer blower starts, it creates a negative pressure. The switch detects this pressure and closes its contacts at the specified set points, signaling the control board that proper draft has been established. If pressure falls outside the acceptable range — due to a blocked flue, failed inducer, or collapsed hose — the switch opens and shuts down the ignition sequence to protect the system and occupants.
Application
- Lennox gas furnaces requiring a .35″/.50″ WC dual pressure switch
- Ideal for HVAC technicians performing warranty or out-of-warranty furnace repairs
- Recommended replacement when furnace displays pressure switch fault codes
Why Choose OEM?
Using a genuine Lennox OEM pressure switch ensures compatibility with your unit’s control board logic, hose fittings, and mounting configuration — reducing callbacks and ensuring the repair is done right the first time.
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