Lochinvar SPDT Pressure Switch

The Lochinvar SPDT pressure switch line (also called an air pressure switch or boiler and water heater pressure switch) gives Lochinvar and A.O. Smith heating equipment a dependable way to monitor pressure. Each switch has a single pole, double throw (SPDT) contact configuration. It opens or closes an electrical circuit when pressure reaches its calibrated set point.

Key Features:

• Single pole, double throw (SPDT) contacts, with one common terminal that switches between normally open and normally closed connections
• Pressure-actuated operation that helps confirm safe operating conditions before the control circuit continues
• Calibrated to a specific water column (WC) set point, with the exact value listed on each individual part number
• Designed as an OEM-style replacement for Lochinvar and A.O. Smith boilers and water heaters
• Used in the safety and control circuits of hydronic and heating systems

Choose the variant whose pressure rating and part number match your original switch. Because the switch is a safety control, replacing it with the correct calibrated part helps keep the heating appliance operating reliably.