3" WC applications across those equipment lines

verifying airflow across the heat exchanger and checking for a restricted filter is essential before installing this automatic reset limit switch

ensuring precise contact closure and opening cycles to prevent line-side surges during startup

reducing mechanical stress on the primary heating assembly and gas valves

Combustion Motor Scroll

Trane CNT1220 Limit Switch 3" WC applications across thoseThe Trane CNT1220 (officially updated to CNT01220) is a high limit thermal safety control engineered for precise HVAC over temperature protection. Designed as a direct OEM replacement part, this 160F auto limit switch monitors the supply plenum temperature to prevent heat exchanger damage or unsafe operating conditions. Utilizing a normally closed SPST (Single Pole Single Throw) contact configuration, it interrupts the gas valve or heating circuit