Description
Lennox 14A46 Two-Stage Pressure Switch
The Lennox 14A46 is an OEM two-stage pressure switch engineered for use in Lennox two-stage gas furnaces. This switch monitors negative pressure (draft) produced by the inducer motor to confirm safe combustion airflow before allowing the ignition sequence to proceed — a critical safety function that protects both the equipment and the occupants.
How It Works
Two-stage furnaces operate at both a low-fire (Stage 1) and a high-fire (Stage 2) capacity. The 14A46 features dual set points to match each firing stage: the switch verifies that the inducer is producing the correct negative pressure at each stage before allowing the gas valve to open. If adequate draft is not confirmed, the switch interrupts the ignition sequence, preventing unsafe operation.
Key Specifications
- Switch Type: Two-Stage (2-STG) Pressure Switch
- Stage 1 Set Point: -0.45 in. W.C.
- Stage 2 Set Point: -0.81 in. W.C.
- Negative pressure (vacuum) sensing — monitors inducer draft
- OEM Lennox replacement part
- SKU / Part Number: 14A46
Application
- Designed as a direct OEM replacement for compatible Lennox two-stage gas furnaces
- Ensures proper inducer operation is verified before ignition at both firing stages
- Protects against flue gas spillage and incomplete combustion
Why Choose OEM?
Using a genuine Lennox OEM pressure switch ensures the correct set points, connector configuration, and reliability that aftermarket alternatives may not match. Proper pressure switch operation is essential for system safety, efficiency, and warranty compliance.
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