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the 333981-401 top cover is designed to withstand harsh outdoor conditions without compromising system airflow
External components like the flame sensor or 11072202 orifice shield may need to be sourced separately if needed
Veteran technicians know that a warped or corroded furnace back plate can lead to vacuum leaks
Utilizing genuine HVAC replacement parts like the Reznor 123976 ensures your equipment maintains factory-spec efficiency and reliability
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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