Lennox 80K28 Pressure Switch Water Column SPST 0.43"

The Lennox 80K28 Pressure Switch Water Column is a safety device used in residential and commercial HVAC equipment to monitor water pressure in boilers and chillers. It's a small, single-pole single-throw (SPST) switch that functions like an on/off trigger based on the water pressure. When pressure falls below a safe minimum limit, the switch opens, shutting down the unit to prevent damage from low water flow. Conversely, if pressure exceeds a safe high limit, the switch can also stop the equipment, protecting the system from leaks, ruptures, and overheating.Size: 0.43 Inches; Voltage: 24V; Type of Switch: Pressure Switch; Connection Type: SPST; Weight: 0.24 lbs. When the water pressure falls below a preset safety limit, the switch opens, cutting power to the unit and preventing damage from low water flow. Conversely, if the pressure surpasses a safe limit, the switch can also shut down the equipment.