Lennox 11U65 SPDT Pressure Switch 60" WC

The Lennox 11U65 is a single-pole, double-throw pressure switch part of many Lennox HVAC equipment furnaces and air handlers. Pressure within the system is observed and through electrical switches, an operation is performed when a specific pressure is attained. When the pressure falls less than a certain level the switch turns on and makes an electrical circuit. On the other hand when the pressure surpasses above this set pressure the switch turns off and breaks the circuit. Such electrical switching functionality is central to safe and efficient operation of HVAC and similar appliances. For instance a pressure switch may cause a furnace automatically turn off because of low pressure.