Lennox 17U20 Pressure Switch

The Lennox 17U20 is a pressure switch used in different HVAC applications such as air handling units and furnaces. It serves as a safety device to monitor air pressure and keep it suitably regulated. If the pressure falls below a certain level, the switch opens circuit contacts and breaks the electrical circuit. This causes a reaction in the HVAC system like the start of the furnace or compressor in cases of low air pressure or sounding of a certain alarm in case of a problem. This pressure switch also helps protect the HVAC system from damage through proper air pressure for efficient operation.