While typically used to set a high-end limit to prevent over-pressurization

Replacing the entire assembly is recommended over cleaning to ensure a consistent micro-amp signal

What is the default pressure setting for this kit

this fitting is UL Recognized for operating pressures up to 700 PSI at 250°F

the switch operates with a precise 25 PSI cut-in (CI) and a 10 PSI cut-out (CO) threshold

Lennox 33J88 Pressure Switch 30067439-890 While typically used to setThe 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