Lennox 33J88 Pressure Switch 30067439-890 the yellow finish on this

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

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

Use the cross-reference data to replace parts like Jun-Air

and Payne residential heating systems

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

Lennox 33J88 Pressure Switch 30067439-890 the yellow finish on thisThe 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