Trane CNT1220 Limit Switch

The 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 once internal temperatures reach the 160°F threshold. Its auto-reset functionality ensures that once system temperatures fall to a safe level, the circuit closes automatically, restoring standard furnace operation. Reliability is critical for technicians troubleshooting short-cycling or abrupt system shutdowns. This limit switch with capillary helps maintain factory performance standards and unit safety certifications across compatible Trane and American Standard rooftop units and split systems. Professional installation ensures proper temperature sensor positioning for accurate readings and long-term system integrity.

• Precise 160°F limit: Ensures immediate circuit interruption to prevent overheating and potential heat exchanger failure.
• Auto-reset capability: Eliminates manual intervention by automatically restoring the connection once the system cools.
• Drop-in OEM compatibility: Replaces Trane CNT1220 and CNT01220 without the need for mounting modifications.
• Normally Closed SPST Switch: Provides standard logic for safety strings in modern HVAC control circuits.

• How do I know if my furnace limit switch is bad? If your system is short-cycling, the blower runs constantly, or the burners fail to ignite despite a heat call, the 160F limit switch may be stuck open or tripping prematurely.
• Is the CNT01220 a direct replacement for the CNT1220? Yes, the CNT01220 is the current manufacturer-designated replacement for the CNT1220, maintaining identical technical specifications.
• Can I use this for other HVAC brands? While technically a 160°F limit, this is an official OEM part specifically designed for the mounting and capillary requirements of Trane equipment.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.