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SKU: 92794133602
Ships within 48 hours · Estimated delivery Sep 5 - Sep 10
chiller dispatch
What does it mean if my Lennox furnace is showing a blocked vent error
Precision Calibration: Factory-set at 4
it is best utilized on the line side of the drive for constant frequency monitoring
Always verify the part number against your unit's data plate or service manual before installation
Lennox 19L57 Pressure Switch 30067439-890 chiller dispatchThe Lennox 19L57 Pressure Switch is a critical OEM safety component engineered for precise airflow monitoring in residential and commercial furnaces. This . 25" WC pressure switch is designed to verify that the draft inducer motor is creating sufficient negative pressure to vent combustion gases safely before allowing the ignition sequence to proceed. As an SPST (Single Pole Single Throw) configuration, it provides a reliable normally open circuit
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