Lennox 80K28 Pressure Switch Water Column SPST 0.43"

The Lennox 80K28 is a Pressure Switch Water Column, safety device in residential and commercial HVAC equipment to measure water pressure in boilers and chillers. It is a tiny switch, single pole single throw switch that works like a trigger based on the water pressure. When the pressure drops below a certain minimum level, the switch opens and the unit is turned off to avoid damage by low water flow. 43 Inches Power Supply, 24 V Pressure Switch SPST . Another switch de-energizes the unit when water pressure drops below a certain level thus protecting the pump from low water flow. On the other hand, if the pressure goes beyond a certain level of threshold, the switch is also able to stop the operation of the equipment.