Lennox 57M66 - (57M6601) Pressure Switch, Actuates at 1.41" W.C.
Ensure reliable and safe furnace operation with the Lennox 57M66 Pressure Switch. Designed to monitor system airflow and help protect against unsafe operating conditions, this OEM pressure switch actuates precisely at 1.41 inches of water column (W.C.), making it an essential component for maintaining proper furnace functionality.
This single-stage pressure switch is factory-calibrated for accurate performance and is commonly used in Lennox heating systems to verify inducer operation and prove negative pressure before ignition. When the correct differential pressure is reached, the switch closes the circuit, allowing the furnace to proceed with the ignition sequence. If the required pressure is not achieved, it remains open to prevent unsafe operation.
Key Features:
- Model: Lennox 57M66 (57M6601)
- Type: Pressure Switch
- Setpoint: Actuates at 1.41" W.C.
- Function: Verifies proper airflow and pressure differential before ignition
- Compatibility: Genuine Lennox replacement part, fits select Lennox gas furnaces
- Construction: Factory-calibrated and pre-mounted for quick installation
Applications:
Ideal for use in high-efficiency Lennox furnaces, the 57M66 pressure switch ensures safe startup by confirming inducer fan performance and pressure conditions. It helps prevent burner ignition in the event of blockages or failed airflow, thereby protecting the heat exchanger and improving overall system safety.
Ideal for use in high-efficiency Lennox furnaces, the 57M66 pressure switch ensures safe startup by confirming inducer fan performance and pressure conditions. It helps prevent burner ignition in the event of blockages or failed airflow, thereby protecting the heat exchanger and improving overall system safety.
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