Trane VAL8799 TXV

When you are dealing with a 5-ton system that is short-cycling or hitting high-head pressure limits, the Trane VAL8799 replacement TXV is the OEM-specified solution for restoring precise superheat control. This thermostatic expansion valve is engineered specifically for R410A refrigerant applications, featuring a 3/8-inch ODS inlet and a 1/2-inch ODS outlet connection. As a critical metering device, the Trane VAL08799 expansion valve maintains the optimal pressure drop between the high and low sides of the 500 PSI rated system, preventing liquid slugging and protecting the compressor from premature failure. Designed for seamless integration into Trane residential air handlers and heat pump coils, this valve provides the responsive modulation required for high-efficiency cooling. For technicians performing a TXV troubleshooting and replacement, the VAL8799 ensures accurate refrigerant flow across a 32°F to 120°F temperature range, maximizing evaporator coil efficiency and system SEER ratings without the common hunting issues found in universal aftermarket alternatives.

• OEM Precision: Guaranteed compatibility with 5-ton Trane and American Standard systems, ensuring the power assembly and sensing bulb are calibrated for the specific coil circuitry.
• Optimized Metering: Specifically ported for R410A refrigerant, providing stable superheat across varying load conditions to prevent frozen evaporator coils.
• Durable Construction: Built to withstand commercial-grade pressures up to 500 PSI, reducing the likelihood of internal leaks or diaphragm failure.
• Performance Restoration: Corrects issues with inconsistent airflow temperatures and high suction pressure, restoring the unit to peak thermal performance.

How do I verify if the VAL8799 is the cause of my frozen evaporator coil?
Technicians should check for low suction pressure accompanied by high superheat. If the sensing bulb is properly insulated and the system has a full charge, a stuck-closed Trane VAL8799 TXV is likely restricting flow.

Does this valve come with the necessary sensing bulb and mounting hardware?
Yes, this OEM expansion valve includes the integral sensing bulb required to monitor the suction line temperature and adjust the refrigerant mass flow accordingly.

Can I use this TXV on a 4-ton system if the connections match?
It is not recommended. This valve is specifically orificed for 5-ton refrigeration capacity. Using an oversized TXV can lead to "hunting" where the valve constantly over-corrects, causing flood-back and unstable operation.

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.