Lennox 51W92 Pressure Switch SPST 1.00" WC

The Lennox 51W92 Pressure Switch SPST is a small switch that is used in many HVAC systems including furnaces and air conditioning systems. It is also a SPST type switch that means it has one contact point which opens or closes with the help of air pressure. Through sensing the pressure, the switch activates electrical appliances such as the furnace or the air conditioner depending on the pressure level that has been set (51W92 model has a set point of 1.00 inch water column). This is essential in order to keep a proper airflow throughout the system and thus proper working of the system.