Lochinvar Air Pressure Switch WC

The Lochinvar air pressure switch (also called a combustion air pressure switch, differential pressure switch or vent proving switch) is a safety control for gas-fired boilers, water heaters and pool heaters. It monitors the air or draft pressure created by the blower or inducer. The switch lets the ignition sequence proceed only when airflow is adequate. Each variant in this line is calibrated to a specific water column (WC) pressure set point.

Key Features:

• Monitors combustion air and venting pressure before allowing burner ignition
• Helps protect against hazardous conditions such as a blocked flue or air intake, or a failed blower or inducer
• Diaphragm-actuated pressure sensing with electrical contacts that open or close at a factory-calibrated set point
• OEM-style replacement part for Lochinvar heating equipment, including boilers, water heaters and pool heaters
• Helps restore reliable operation and reduce nuisance lockouts caused by a worn or failed switch

Choose the child item whose pressure rating and part number match your original switch. Replacing a faulty air pressure switch with a Lochinvar part helps keep your heater operating safely and efficiently.