The Lennox 12U39 (103893-04) Restrictor Assembly is a factory-original component engineered for use in select Lennox HVAC systems. This precision restrictor plays a critical role in metering refrigerant flow, protecting the compressor, and ensuring optimal thermal transfer across the evaporator coil.Product Specifications:

• Manufacturer: Lennox
• OEM Part Number: 12U39
• Lennox Catalog Number: 103893-04
• Component Type: Restrictor Assembly
• Function: Fixed orifice flow control for refrigerant metering
• Body Material: Brass/copper composite with brazed connections
• Inlet/Outlet Size: 3/8" ODF inlet x 1/4" ODF outlet (verify with service manual)
• System Application: Used in cooling and heat pump systems for indoor coil expansion
• Mounting Type: Inline – brazed connection installation
• Operating Pressure Range: Designed for standard R-410A or R-22 system pressures (check system compatibility)
• Temperature Rating: Suitable for standard HVAC operation ranges (-20°F to 180°F)

Additional Information:

• Compatible with multiple Lennox condenser and air handler models
• Helps maintain proper superheat and refrigerant distribution
• Critical for ensuring energy efficiency and system longevity
• Always replace with OEM part to maintain warranty and performance standards

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