clogged filters

this HVAC limit switch is built to handle the inductive loads of modern blower motors and control boards

making it suitable for both pressurized HVACR lines and above-ground potable water supply systems

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

Trane CNT1220 Limit Switch clogged filtersThe 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