Lennox 33J88 Pressure Switch 30067439-890 ensuring that your BAS logic

ensuring that your BAS logic can detect belt breaks

drawing the standard 24VAC control voltage from the integrated furnace board

It’s designed to safeguard the compressor by continuously monitoring suction pressure

protecting sensitive instrumentation from corrosion and failure

this thermal expansion valve is internally compensated and calibrated specifically for the pressure-temperature relationship of R410A

Lennox 33J88 Pressure Switch 30067439-890 ensuring that your BAS logicThe Lennox 33J88 Pressure Switch is a critical safety component designed for precise draft monitoring in high efficiency gas furnaces. Rated for a set point of 4. 50" WC, this SPST (Single Pole Single Throw) switch provides reliable circuit closure to the control board once the inducer motor establishes the required negative pressure. This part is a direct factory replacement for Lennox model 33J8801, ensuring a drop in fit with existing mounting