Carrier 331709-753 Expansion Valve

The Carrier 331709-753 Expansion Valve is a critical OEM replacement part engineered for high-capacity 5-ton cooling systems. Designed specifically for R-22 refrigerant, this thermostatic expansion valve (TXV) provides precise superheat control by modulating the flow of refrigerant into the evaporator coil. Reliable metering is essential for maintaining HVAC system efficiency and preventing liquid slugging in the compressor, especially in older R-22 residential and light commercial units. Utilizing an externally equalized design with a 3/8" ODF inlet and 3/4" threaded outlet, this valve ensures stable operation under fluctuating load conditions. For technicians performing a TXV kit replacement, this factory-authorized part includes the necessary bulb mounting hardware and Teflon rings to ensure a leak-free seal. Whether you are servicing a Carrier, Bryant, or Payne 60,000 BTU unit, using this genuine 331709-753 valve maintains the original equipment’s performance specifications and refrigerant flow accuracy.

Key Benefits for the Contractor:

• Precise Flow Regulation: Maintains optimal evaporator superheat to maximize heat transfer and system COP.
• Direct OEM Compatibility: Replaces older part numbers including EA36YD056, ensuring a perfect physical and functional fit for 5-ton systems.
• Complete Hardware Kit: Includes bulb mounting strap, nylon zip tie, and Teflon ring to streamline installation on the job site.
• Robust Construction: Built to withstand high-pressure environments (up to 660 psig) common in R-22 and R-407C applications.

Common Questions & Technical Insights:

Can this TXV be used with R-410A systems?
No, this valve is specifically calibrated for the pressure-temperature characteristics of R-22 (and R-407C). Using it with R-410A will result in improper metering and potential system failure.

What is the tonnage rating for this specific Carrier part?
This is a 5-ton (60,000 BTU) valve, often cross-referenced as a 6.7 TR unit in specific industrial configurations, making it ideal for large residential split systems or packaged units.

Is the sensing bulb location critical for this model?
Yes, as an externally equalized valve, the sensing bulb must be securely mounted on a horizontal section of the suction line, properly insulated to ensure accurate temperature feedback to the power element.

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.