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It’s designed to safeguard the compressor by continuously monitoring suction pressure
Always verify the lead color and the specific fault code (Code 4 vs
ensuring optimal superheat levels and protecting the compressor from liquid slugging
the yellow finish on this spring indicates a field-adjustable range of 15" to 30" WC
protecting sensitive instrumentation from corrosion and failure
Lennox 33J88 Pressure Switch 30067439-890 It’s designed to safeguard theThe 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
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