Carrier 331709-758 TXV Kit

The Carrier 331709-758 TXV Kit is a precision-engineered thermal expansion valve designed for R-410A refrigerant control in residential and commercial indoor coils. Built to maintain a constant superheat at the evaporator outlet, this OEM replacement part replaces aging or failed valves to prevent liquid slugging and ensure high-side efficiency. As a thermostatic expansion valve, it utilizes a sensing bulb to monitor thermal load, modulating flow to keep the suction gas in the proper superheated state. This kit is a direct fit for specific Carrier, Bryant, and Payne A-coil models, including CNPVP6124 series units. For a technician in the field, this HVAC mechanical TXV is the standard for restoring factory-spec refrigerant metering, protecting the compressor from damage due to floodback. Its balance-port design ensures stable operation across varying ambient temperatures, making it a reliable choice for maintaining SEER ratings and system performance during high-load cooling cycles.

• Engineered for R-410A: Specifically calibrated for high-pressure R-410A refrigerant systems to ensure precise metering.
• OEM Compatibility: Authentic Factory Authorized Part ensures perfect alignment with existing refrigerant lines and sensing bulb locations.
• System Protection: Actively prevents liquid refrigerant from entering the compressor, significantly reducing the risk of mechanical failure.
• Optimized Efficiency: Maintains the exact evaporator superheat required to maximize heat transfer and system cooling capacity.

Is the Carrier 331709-758 compatible with R-22 systems?
No, this specific thermal expansion valve is calibrated exclusively for R-410A refrigerant systems. Using it with R-22 will result in improper metering and potential system damage.

What symptom indicates a failed TXV in a Carrier A-coil?
Common signs include a "hunting" suction pressure, high superheat, or an evaporator coil that is partially frosting while the compressor is running under load.

Does this kit include the sensing bulb and mounting hardware?
Yes, this TXV Kit is a complete assembly designed to replace the existing valve, including the necessary components for standard installation on compatible Carrier HVAC models.

This item is not eligible for free shipping.

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.