Trane CNT2239 Temperature Control

The Trane CNT2239 Temperature Control is a rugged, manual reset mechanical thermostat designed for high-performance HVACR applications. Engineered to monitor and regulate environmental conditions within a precise -30 to 100°F temperature range, this control is the designated direct replacement for CNT2222 and serves as the official updated version of the A19ACA-17. For technicians in the field, this unit provides the reliable SPST (Single Pole Single Throw) switching necessary for critical limit sensing and temperature differential management in both residential and light commercial systems.

Built for durability in demanding environments, the CNT2239 features a heavy-duty sensing bulb and capillary to ensure accurate thermal response. Its manual reset functionality is a vital safety feature, requiring a technician's physical intervention after a high-limit trip, which prevents equipment cycling under potentially hazardous conditions. Whether you are performing a Trane control board upgrade or replacing an aging A19 series thermostat, the Trane CNT2239 delivers a seamless fit with standard mounting footprints, reducing labor time during HVAC part replacement and ensuring long-term system stability.

• Broad Operating Range: Covers -30/100f, making it ideal for freezers, coolers, and ambient air monitoring.
• OEM Compatibility: Guaranteed direct replacement for CNT2222 and A19ACA-17, eliminating field modification guesswork.
• Fail-Safe Design: The manual reset mechanism ensures that system faults are addressed before operation resumes.
• Universal Application: Compatible with any HVAC system requiring a reliable mechanical temperature control with an SPST contact.
• Heavy-Duty Construction: Designed to withstand the vibration and temperature fluctuations common in industrial mechanical rooms.

Is the CNT2239 a 1:1 swap for the older A19ACA-17?
Yes, the CNT2239 is specifically engineered by Trane to replace the Johnson Controls A19ACA-17 series. It maintains the same -30 to 100 degree Fahrenheit range and manual reset behavior.

What happens if the sensor reaches the high-limit setpoint?
Because this is a manual reset control, the internal switch will open and remain open even after temperatures return to normal. A technician must manually press the reset button to close the circuit.

Does this unit require a specific orientation for mounting?
While the Trane CNT2239 is versatile, it is best practice to mount the housing vertically to protect the internal components from moisture accumulation and to ensure the manual reset button is easily accessible for troubleshooting.

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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.