Trane CNT3666 Pressure Switch 321894-709 ensuring the contact bridge handles

ensuring the contact bridge handles the startup inrush current of HVAC compressors without sticking

High Load Capacity: Engineered for heavy radial and axial loads

this relay device compensates for flow surges and internal friction to ensure the valve stem remains exactly where the controller dictates

maintaining the integrity of the original equipment manufacturer’s air handler or furnace design specifications

Maximum Safety: Monitors for flame rollout and trips at a calibrated 260°F threshold

Trane CNT3666 Pressure Switch 321894-709 ensuring the contact bridge handlesThe 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