Trane CNT3783 Limit Switch 320074-702 a failure to close the

a failure to close the pressure switch during the pre-purge cycle

Field technicians know that precise belt geometry is essential for maintaining static pressure and airflow performance in York package units and large-scale rooftop systems

this OEM replacement part is essential for verifying proper blower operation and flue venting before the ignition sequence begins

Direct Fit Design: Standardized mounting and terminal configuration allows for rapid field installation during emergency furnace troubleshooting

Trane CNT3783 Limit Switch 320074-702 a failure to close theThe Trane CNT3783 Limit Switch is a critical safety component engineered for precise thermal management in high demand furnace and air handler applications. As an OEM Trane replacement part, this SPST (Single Pole Single Throw) device operates on a Normally Closed (N C) circuit, designed to interrupt electrical flow immediately when the system achieves its setpoint. Calibrated with a 220F opening temperature, it serves as a primary high limit defense