Lennox 12J19 Thermal Expansion Valve Kit 3-Ton R410A A/C

The Lennox 12J19 Thermal Expansion Valve Kit is a replacement part specifically designed for Lennox HVAC systems. It regulates the flow of refrigerant based on temperature, optimizing system performance. Here's how it works: Installed within the air conditioning unit, the valve acts like a pressure regulator. As refrigerant enters the valve, a sensing bulb filled with refrigerant vapor expands or contracts with temperature changes. This movement adjusts the valve's internal mechanism, controlling the flow of refrigerant into the evaporator coils. By precisely regulating refrigerant flow based on temperature, the thermal expansion valve ensures optimal cooling efficiency and prevents potential damage from excess refrigerant. This kit typically includes a 3/4 inch valve suitable for systems handling pressures up to 660 psi with a temperature range of 167°F to 230°F (75°C to 110°C). Its lightweight design (around 1.1lbs) makes it manageable for servicing technicians.