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the 333981-401 top cover is designed to withstand harsh outdoor conditions without compromising system airflow
Watch for short cycling
External components like the flame sensor or 11072202 orifice shield may need to be sourced separately if needed
the switch breaks the circuit when the temperature falls to the set point
Trane CNT3666 Pressure Switch 323080-701 the 333981-401 top cover isThe Trane CNT3666 Pressure Switch is a critical safety component engineered for precise draft monitoring in high efficiency HVAC systems. This single pole single throw (SPST) switch is factory calibrated to a 0. 15" WC set point, ensuring the inducer motor establishes a proper vacuum before allowing the ignition sequence to proceed. Designed as a direct OEM replacement pressure switch, it features a 1 4" barbed connection for secure pneumatic tubing
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