Lennox 78W57 SPST Pressure Switch Assembly 0.27" WC

The Lennox 78W57 Pressure Switch SPST .27" WC is a safety device that is in different Lennox HVAC-equipment. It keeps a check on the air pressure into the system. When the pressure decreases to a certain level usually the switch turns on or off an electrical circuit. This initiates action such as halting the blower fan in order to avoid the system being destroyed by high pressure.The switch operates on a low voltage of 24V for safe handling and It is wide and tall. This triggers actions like stopping the blower fan to prevent damage from excessive pressure. The switch operates on a low voltage of 24V for safe handling and Its wide, and tall.