Lennox 26W41 Two-Stage Pressure Switch 0.50″/0.85″ W.C.

Description

The Lennox 26W41 is a two-stage pressure switch engineered as a direct OEM replacement for compatible Lennox furnace and heating systems. Designed to monitor and verify proper inducer draft operation, this pressure switch provides dual-stage protection with factory-set trip points of 0.50″ and 0.85″ water column (W.C.), ensuring the system operates safely and efficiently across both heating stages.

Key Features

• Two-stage pressure switch with dual set points
• Set Point 1: 0.50″ W.C.
• Set Point 2: 0.85″ W.C.
• OEM Lennox replacement part (SKU: 26W41)
• Monitors inducer/draft blower operation before allowing burner ignition
• Helps prevent unsafe furnace operation due to blocked flue or failed inducer
• Direct drop-in replacement for compatible Lennox furnace models

Application

This pressure switch is a critical safety component in two-stage gas furnaces. It verifies that the draft inducer motor has established proper negative pressure in the heat exchanger before the ignition sequence is permitted to begin. By confirming adequate airflow at both low-fire (0.50″ W.C.) and high-fire (0.85″ W.C.) stages, the 26W41 protects against heat exchanger damage, incomplete combustion, and potential carbon monoxide hazards.

Specifications

• Brand: Lennox
• Part Number: 26W41
• Type: Two-Stage Pressure Switch
• Stage 1 Set Point: 0.50″ W.C.
• Stage 2 Set Point: 0.85″ W.C.
• Application: Gas furnace draft proving / inducer verification