Carrier 331709-755 TXV Kit

The Carrier 331709-755 TXV Kit is a critical metered expansion device engineered for high-efficiency refrigerant flow control in residential and commercial HVAC systems. Designed for R-410A refrigerant applications, this Thermostatic Expansion Valve (TXV) maintains the optimal superheat at the evaporator outlet, maximizing heat transfer and protecting the compressor from liquid slugging. This specific kit is frequently utilized in Carrier, Bryant, and Payne air handlers or cased coils to ensure precise saturation temperatures during varying load conditions. The 331709-755 replacement includes the sensing bulb and necessary hardware for a direct mechanical fit. Technical performance relies on the internal diaphragm assembly responding to suction line pressure and temperature, modulating the needle valve to compensate for load fluctuations. For technicians performing a split system repair or upgrading older fixed-orifice systems, this direct OEM replacement part ensures the system meets its rated SEER performance levels and operational design specs.

• Ensures precise superheat control across a wide range of ambient temperatures and indoor loads.
• Compatible with R410A Carrier air conditioners and heat pump systems for reliable cooling cycles.
• Prevents refrigerant flood-back, extending the operational life of the condensing unit compressor.
• Engineered for OEM compatibility, reducing field modification time during installation or maintenance.
• Includes a hard-balanced port design to handle rapid pressure changes within the refrigeration circuit.

Is the 331709-755 compatible with older R-22 systems?
No, this TXV is specifically calibrated for the pressure-temperature characteristics of R-410A refrigerant and should not be used in R-22 applications.

Does this kit include the equalizer line and sensing bulb clamps?
Yes, the kit is designed as a complete TXV field installation package, containing the valve body and the necessary components for securing the sensing bulb to the suction header.

Can this valve be used on both cooling-only and heat pump units?
This Carrier TXV kit is intended for use in indoor evaporator coils; however, contractors should verify the specific coil model to determine if a check-valve bypass is required for heat pump heating cycles.

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.