Lennox 11J10 Pressure Switch R-134A Built with a standard 1/4"

Built with a standard 1/4" NPT bottom connection

typically setting the cut-out around 90°F and the cut-in at 120°F to prevent blower short-cycling

The assembly features a factory-fitted MP84 pneumatic actuator with a 9-13 PSI spring range and spring return safety functionality

reducing diagnostic and installation labor

allowing the amplifier to detect minute temperature shifts

Lennox 11J10 Pressure Switch R-134A Built with a standard 1/4"The Lennox 11J10 Pressure Switch is a critical safety component designed for precise combustion air monitoring in Lennox residential furnaces and light commercial HVAC units. Calibrated to a specific 0. 55" WC (Water Column) set point, this single stage differential switch ensures the draft inducer motor is moving sufficient air to safely exhaust combustion gases before the ignition sequence initiates. A failure in this component typically results in