Lennox 75M22 Pressure Switch Replacement

The Lennox 75M22 is a pressure switch used in replacement of Lennox HVAC equipment. It is a tiny component that has a dimension of 0.75 Inches and is crucial to both system safety and performance. A pressure switch measures the air pressure inside the HVAC system. When pressure gets to a certain level, the switch produces an on/off signal to the furnace control board. This switch is SPST switch that is meant for 240V at a frequency of 50Hz. Advantages are pressure control, protection of equipment from high or low pressure, and increase in the safety of the system.