Carrier 331709-798 TXV Valve

The Carrier 331709-798 R410A 4 Ton TXV Valve is a critical metering device designed for evaporator coil applications in high-efficiency residential and light commercial systems. This OEM thermostatic expansion valve ensures precise refrigerant flow control by monitoring the superheat of the suction line and adjusting the orifice to maintain optimal heat transfer across the coil. As a direct replacement for 331709-772, this valve is engineered to resolve common cooling issues such as liquid floodback or starving the evaporator. It features a 3/8 inch inlet connection and is specifically calibrated for R-410A refrigerant systems. For technicians performing an AC expansion valve replacement, this kit provides the reliability required to restore factory-spec cooling capacity. Utilizing a genuine Carrier TXV kit during refrigerant system repairs ensures compatibility with existing Carrier, Bryant, and Payne air handlers and cased coils, preventing the premature compressor wear often caused by generic aftermarket components.

• Ensures accurate refrigerant metering to maximize system SEER ratings and cooling efficiency.
• Features an internal check valve for reliable operation in both cooling and heat pump applications.
• Direct replacement for 331709-772 ensures a perfect physical fit and proper pressure drop characteristics.
• Designed specifically for 4-ton R410A systems to maintain stable superheat across varying load conditions.
• OEM quality construction reduces the risk of leaks and sensing bulb failures common in universal parts.

What are the symptoms of a failing Carrier 331709-798 TXV?
Common indicators include frost on the evaporator coil, high suction pressure with low superheat (flooding), or low suction pressure with high superheat (starving), often leading to poor cooling performance.

Is the 331709-798 compatible with older R-22 systems?
No, this TXV valve is strictly calibrated for R-410A refrigerant. Using it with R-22 will result in incorrect metering and potential system damage.

Can I use this valve to replace part number 331709-772?
Yes, the 331709-798 is the official direct replacement for 331709-772, offering the same 3/8 inch inlet and 4-ton capacity ratings.

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.