Lennox 10W77 Expansion Valve

The Lennox 10W77 Expansion Valve is a critical OEM R-22 expansion valve designed for precise refrigerant metering in residential and commercial cooling systems. This thermostatic expansion valve (TXV) includes an internal check valve, making it a direct replacement for heat pump applications and air conditioning units. Engineered by Parker for Lennox, the 10W77 regulates flow based on evaporator load to prevent slugging and optimize superheat levels. Often listed under part numbers 100481-02 or 18M89, this brass TXV is balanced for 2.5 to 3.5-ton capacities. It ensures consistent evaporator coil temperatures, maintaining system efficiency during high-ambient conditions. For contractors, this Lennox replacement part offers a reliable solution for restoring factory-spec performance in legacy R-22 equipment from Lennox, Allied, and Armstrong brands. Durable construction and precise pressure handling up to 450 PSI make it a standard choice for technicians performing HVAC valve replacement on 10HPB and 13HPD series units.

• Optimized Efficiency: Maintains precise refrigerant flow to the evaporator, maximizing heat exchange and lowering energy consumption.
• Heat Pump Compatible: Integrated internal check valve allows for bidirectional flow, essential for heat pump heating and cooling cycles.
• OEM Reliability: Genuine Lennox 10W77 part ensures exact fitment and pressure ratings, reducing callback risks compared to universal alternatives.
• Hardware Compatibility: Replaces older 18M89 and 100481-02 models across Lennox, Armstrong, and Ducane equipment.

Is the Lennox 10W77 compatible with R-410A systems?
No, this valve is specifically calibrated for R-22 refrigerant units. Using it with R-410A will lead to incorrect metering and potential compressor damage due to different pressure requirements.

Does this TXV include the sensing bulb?
Yes, the Lennox 100481-02 assembly includes the integrated sensing bulb required for monitoring suction line temperature and adjusting flow dynamically.

What tonnage is the 10W77 rated for?
This HVAC expansion valve is typically utilized in systems ranging from 2.5 to 3.5 tons, ensuring accurate control for mid-sized residential split systems.

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.