Lennox 33J88 Pressure Switch 30067439-890 rating plate labels

rating plate labels

the yellow finish on this spring indicates a field-adjustable range of 15" to 30" WC

ensuring optimal superheat levels and protecting the compressor from liquid slugging

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

and Payne residential heating systems

Lennox 33J88 Pressure Switch 30067439-890 rating plate labelsThe 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