Trane CNT2858 Pressure Switch

The Trane CNT2858 low pressure switch is a critical safety component designed for precise refrigerant monitoring in residential and light commercial HVAC systems. This 1/4" Op7 CL22 pressure switch features a SPST (Single Pole Single Throw) configuration, internally calibrated to open the circuit at 7 PSI and close at 22 PSI. Engineered for compatibility with a wide range of Trane and American Standard air handlers and condensing units, this switch prevents compressor damage by interrupting the control circuit during a loss of charge or low-pressure fault. HVAC technicians rely on the CNT-02858 for its consistent set points and high-cycle reliability in R-22 and R-410A applications. Its compact design facilitates a direct-mount installation on the liquid or suction line, ensuring an airtight seal and accurate pressure detection. Maintaining a functional HVAC low pressure cutout is essential for system longevity and preventing oil return issues during low-pressure events.

Key Benefits for Technicians:

• Precision Calibration: Factory-set at 7 PSI Open and 22 PSI Close for reliable low-side protection.
• Universal Fitment: Designed as a direct replacement part for numerous Trane HVAC components.
• Durable Construction: Built to withstand high-vibration environments typical of 1/4" flare connections.
• System Protection: Effectively prevents compressor burnout by mitigating operation under insufficient refrigerant levels.

Common Questions:

What are the specific trip points for the CNT2858?
This switch is calibrated with an opening pressure of 7 PSI and a closing pressure of 22 PSI, adhering to standard safety protocols for residential direct-expansion systems.

Is this switch compatible with both R-22 and R-410A systems?
Yes, the technical specifications of the Trane CNT2858 allow it to operate within the specific pressure ranges and refrigerant oil environments of both modern and legacy equipment.

Does this part require a specific mounting orientation?
While it can be mounted in multiple positions, it is best practice to install it vertically on the service port to minimize debris accumulation at the diaphragm entry point.

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.