Lennox 88W59 SPST Pressure Switch -0.15" WC -40/185F

The Lennox 88W59 is a single pole single throw (SPST) pressure switch designed for HVAC applications. This pressure switch operates at a low pressure differential of -0.15 inches water column, making it ideal for monitoring negative pressure conditions in furnace venting systems and draft proving applications.

Key Features:

• SPST (Single Pole Single Throw) switching configuration
• Operating pressure: -0.15 inches water column (negative pressure)
• Wide operating temperature range: -40°F to 185°F
• Designed specifically for Lennox furnace and HVAC systems
• Reliable pressure sensing for draft and venting safety

This pressure switch is commonly used as a safety component in residential and light commercial furnaces to verify proper draft conditions before allowing the heating system to operate. The switch closes when the specified negative pressure is achieved, signaling that adequate venting is present.