Mueller Industries 40680350b3b6 Mini Split Line Set

Product Description

The MUELLER INDUSTRIES 40680350b3b6 is a mini split line set configured with flare fittings on both the liquid and suction lines. It uses C12200 phosphorus deoxidized copper tubing, which is the standard alloy for refrigerant-grade line sets. The liquid line measures 1/4 inch and the suction line measures 3/8 inch. Both lines come fully insulated with black elastomeric insulation at a 3/8 inch wall thickness. This line set is built to ASTM B1003 standards and rated to 700 psi per UL requirements. Licensed HVAC technicians install this type of line set when connecting a ductless mini split indoor air handler to its outdoor condensing unit.

This line set is suited for residential and light commercial ductless mini split installations. The flare fitting ends on both lines allow for a leak-resistant mechanical connection without soldering, which is common in mini split applications where field brazing is not practical or preferred. The elastomeric insulation on both lines reduces heat gain on the suction line and protects the liquid line in exposed or semi-exposed routing conditions. This configuration is widely used in new construction and retrofit installations where a clean, pre-insulated, pre-terminated line set speeds up the rough-in process.

Key Features

• C12200 copper tubing construction meets ASTM B1003 standards for refrigerant line sets
• Rated to 700 psi per UL, suitable for common residential mini split refrigerants
• Flare fittings on both liquid and suction lines eliminate field brazing at terminations
• Both lines insulated with black elastomeric insulation at 3/8 inch wall thickness
• 1/4 inch liquid line and 3/8 inch suction line sizing matches standard mini split port dimensions
• No 90-degree bends pre-formed, allowing flexible field routing

Compatibility

Designed as an OEM-style replacement or new-installation line set for ductless mini split systems requiring a 1/4 inch liquid line and 3/8 inch suction line with flare fitting terminations.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with applicable mechanical codes and the equipment manufacturer's instructions. Recover or isolate any refrigerant before disconnecting an existing line set. When making flare connections, use a calibrated flare tool and inspect each flare seat before torquing fittings to the equipment manufacturer's specification. Insulation joints and penetrations should be sealed to prevent condensation and protect insulation from UV degradation in outdoor runs.

Technical Specifications

• Line Set Type: Mini Split Line Set
• Liquid Line Size: 1/4 inch
• Suction Line Size: 3/8 inch
• Insulation Material: Elastomeric (black)
• Insulation Wall Thickness: 3/8 inch
• Insulation Coverage: Both lines insulated
• Finish Option: Flare fittings
• Material: C12200 copper
• Pressure Rating: 700 psi (UL)
• Standards: ASTM B1003, UL 700 psi
• 90-Degree Bends: No
• Weight: 7.49 pounds

Standard Information

• Brand: MUELLER INDUSTRIES
• Manufacturer Part Number: 40680350b3b6