S1‑024-27634-001 Pressure Switch – 0.65″ WC, SPNO, Close on Fall

Product Overview

The York S1‑02427634001 is an OEM 0.65″ WC pressure switch designed for reliable furnace safety monitoring and proper airflow verification. This SPNO (Single‑Pole, Normally Open) switch closes on pressure fall, ensuring the system only fires when draft and combustion conditions meet manufacturer specifications.

Engineered for compatibility with select York, Coleman, and Luxaire units, this switch maintains safe operation by preventing burner ignition under inadequate draft or blocked vent conditions.