Lennox 78L19 Expansion Valve for HVAC Systems

The Lennox 78L19 is a precision-engineered thermal expansion valve (TXV) designed to regulate refrigerant flow in residential and light commercial air conditioning and heat pump systems. This valve plays a critical role in the refrigeration cycle by controlling the transition of refrigerant from a high-pressure liquid state to a low-pressure vapor state, ensuring optimal cooling performance and system efficiency.

Key Features:

• Brass construction for superior corrosion resistance and durability
• Threaded inlet and outlet connections for secure, straightforward installation
• Precision flow control mechanism maintains proper superheat levels in the evaporator coil
• Regulates refrigerant pressure and temperature to prevent system damage from over- or under-expansion
• Compact design suitable for various HVAC system configurations
• OEM part number R44478-001

The Lennox 78L19 expansion valve ensures efficient heat transfer and reliable cooling capacity by precisely controlling refrigerant flow rates based on system conditions. This component is designed for use in Lennox heat pumps and air conditioning units, helping to maximize energy efficiency and extend system lifespan. Professional installation by a qualified HVAC technician is recommended for optimal performance.