Lennox Y8736 TXV Kit

The Lennox Y8736 TXV Kit is a field-installed 3-ton thermal expansion valve specifically engineered for high-efficiency R410A air conditioning and heat pump systems. As a professional-grade refrigerant flow control device, this kit ensures precise superheat maintenance across varying load conditions, preventing liquid slugging and evaporator starve-out. This TXV replacement kit is the direct performance alternative for legacy part numbers 12J19, 39L72, and H4TXV02-1. Produced by Sanhua (model RFGF05E-3.0-747), it features a balance-ported design and an internal check valve, making it ideal for heat pump TXV applications where reverse flow is required. The assembly includes premium stainless steel sensing bulbs and Chatleff connections for a leak-resistant, mechanical fit. Utilizing a Lennox expansion valve maintains OEM-spec pressure drops and system capacity, critical for meeting SEER2 efficiency targets in modern 3-ton residential splits. This kit provides the necessary Teflon washers and bulb straps for a complete professional installation.

• Precise Superheat Control: Optimizes evaporator coil performance by accurately metering R410A refrigerant based on load demand.
• OEM Compatibility: Validated replacement for Lennox 12J19 and Lennox 39L72, ensuring original equipment performance standards.
• Durable Construction: Features a Sanhua expansion valve with stainless steel sensing elements for long-term corrosion resistance in harsh environments.
• Installation Ready: Includes mechanical Chatleff connections and external equalizer lines to streamline field replacement.
• Versatile Application: Integrated check valve supports both cooling-only and heat pump bi-directional flow configurations.

What are the symptoms of a failing Lennox Y8736 TXV?
Technicians often observe high superheat, low suction pressure, and normal to high subcooling. If the valve is stuck closed, it replicates a system restriction or low charge; if stuck open, it can lead to compressor flooding.

Is this kit compatible with older R22 systems?
No. The Y8736 TXV Kit is calibrated specifically for the pressure-temperature characteristics of R410A refrigerant. Using it with R22 will result in improper metering and potential compressor damage.

Do I need to replace the liquid line filter drier when installing this kit?
Yes. Standard industry practice requires replacing the filter drier whenever the refrigerant circuit is opened to prevent moisture or debris from fouling the new needle and seat assembly.

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.