Lochinvar Low Air Pressure Switch WC

The Lochinvar Low Air Pressure Switch (also called an air pressure switch or combustion air proving switch) is an OEM safety control for Lochinvar boilers and water heaters. It monitors air pressure or vacuum, measured in inches of water column (WC), in the combustion air and venting system. The burner is allowed to fire only when the inducer or blower has established proper airflow.

Key Features:

• Diaphragm-actuated pressure sensing that responds to changes in combustion air pressure
• Calibrated to a factory setpoint in inches WC, with several setpoint options across the product line
• Helps prevent unsafe operation if the vent is blocked or the inducer assembly fails
• Works with the control board to support proper ignition sequencing and combustion safety
• Genuine Lochinvar OEM replacement part, built for the heat and moisture found in boiler and water heater applications

Lochinvar has made boilers and water heaters for residential and commercial use since 1939. Choose the setpoint that matches your original switch to restore dependable, safe operation.