50 ft 1/4″ × 3/8″ Mini Split Long Line Set – Pre-Insulated HVAC Copper Refrigerant Tubing

50 ft 1/4" x 3/8" Mini Split Long Line Set

The 50 ft 1/4" x 3/8" mini split long line set is a pre-insulated HVAC copper refrigerant tubing set designed for ductless mini split air conditioners, heat pumps and split HVAC systems that require a longer indoor-to-outdoor connection.

This line set includes a 1/4" liquid line and a 3/8" suction line with factory-applied insulation. It helps support reliable refrigerant flow, reduce heat loss, minimize condensation and improve installation efficiency in residential and light commercial HVAC projects.

Dabund supplies mini split line sets, insulated copper pipe, aluminum pipe and HVAC parts for contractors, wholesalers, distributors and private-label HVAC brands.

Product Overview: 50 ft Mini Split Long Line Set

This 50 ft long line set provides a complete refrigerant piping solution for mini split and ductless HVAC installations. The factory-applied insulation helps protect the copper tubing, maintain refrigerant temperature and reduce energy loss along the line run.

The 50 ft length is suitable for extended installations between indoor and outdoor HVAC units. It helps reduce the need for extra couplings or additional line extensions when the outdoor condenser is located farther from the indoor unit.

Key Features of 50 ft 1/4" x 3/8" Mini Split Long Line Set

• 50 ft / 15.2 m mini split long line set for extended HVAC installations.

• 1/4" liquid line and 3/8" suction line for compatible mini split systems.

• Pre-insulated copper refrigerant tubing helps reduce heat loss and condensation.

• 99.9% pure copper construction supports efficient refrigerant transfer.

• Factory-applied insulation saves installation time compared with field wrapping.

• Suitable for ductless mini split AC, heat pumps and residential HVAC systems.

• Useful for retrofit, replacement and new installation projects.

• White PE insulation provides a clean appearance and practical thermal protection.

• Compatible with common HVAC refrigerants such as R410A and R32 when installed correctly.

• OEM printing, custom packaging and bulk supply are available for distributors.

Technical Specifications

Premium Copper Refrigerant Tubing

1/4" Liquid Line

The 1/4" copper tube is commonly used as the liquid line. It carries high-pressure refrigerant from the outdoor unit to the indoor evaporator coil in compatible mini split and split HVAC systems.

3/8" Suction Line

The 3/8" copper tube is commonly used as the suction line. It returns low-pressure refrigerant vapor from the indoor unit back to the outdoor compressor.

99.9% Pure Copper Construction

The line set uses 99.9% pure seamless copper with good thermal conductivity, corrosion resistance and mechanical durability. This supports stable refrigerant flow and long-term HVAC performance.

Factory-Applied Insulation for HVAC Performance

Factory-applied insulation helps maintain refrigerant temperature throughout the line run. It reduces heat gain, heat loss and surface condensation, helping the system operate more efficiently during cooling and heating cycles.

• High-density insulation applied at the factory.

• UV and moisture-resistant outer jacket options are available.

• Helps prevent condensation and pipe sweating.

• Reduces the need for additional field insulation work.

• Contributes to consistent HVAC system performance across different climates.

99.9% Pure Copper

White PE Insulated Pipe

Plastic Cap Protection

Features of Pipe Insulation Tubing

The insulation tubing is designed to protect copper refrigerant lines from temperature loss, condensation and installation damage. It supports stable performance for long HVAC line runs and helps protect the copper line in indoor and outdoor applications.

• Factory-applied thermal insulation for consistent coverage.

• Helps reduce heat gain and heat loss along the refrigerant line.

• Helps minimize condensation on the pipe surface.

• Protects copper tubing during indoor and outdoor installation.

• Available insulation thickness options include 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm.

• Flame-resistant options such as M1 and B1 are available.

Thermal Insulation Pipe Production

Insulation Pipe Warehouse

Inner Layer Insulated Pipe

Key Benefits of This Mini Split Long Line Set

Ideal for HVAC and Mini Split Systems

This line set is engineered for ductless mini split units, heat pumps, residential HVAC systems and light commercial installations. It supports dependable refrigerant flow and practical thermal efficiency.

Faster Installation and Reduced Labor

Pre-insulated copper tubing helps reduce on-site insulation work. The ready-to-install design lowers labor time and simplifies refrigerant line preparation for HVAC installers.

Enhanced System Efficiency

Factory insulation minimizes unwanted heat exchange with ambient air, helping improve cooling and heating performance while reducing energy loss along the line set.

Applications: Where This Line Set Is Used

This 50 ft 1/4" x 3/8" mini split long line set is suitable for HVAC projects that require longer refrigerant line runs between indoor and outdoor units.

• Residential ductless AC installations.

• Wall-mounted and ceiling-mounted mini split systems.

• Heat pump refrigerant lines.

• Retrofit and replacement line set projects.

• Light commercial HVAC setups.

• HVAC contractors, wholesalers and experienced installation teams.

HVAC Installation Best Practices

Measure Total Run Length Before Installation

Measure the full distance between indoor and outdoor units before cutting or routing the tubing. Confirm that the 50 ft line set is within the equipment manufacturer’s approved line length.

Avoid Kinks and Sharp Bends

Avoid sharp bends that may restrict refrigerant flow or damage the insulation. Use proper bending tools and follow HVAC installation best practices.

Ensure Continuous Insulation Coverage

Keep insulation continuous along the line run, especially near wall penetrations, bends and outdoor exposed sections. This helps reduce condensation and thermal loss.

Use Proper Flaring and Sealing Tools

If tubing is cut to length, use proper cutting, deburring, flaring and torque practices to help maintain leak-proof connections and stable system performance.

Mini Split Line Set Size Options

Recommended Applications by AC Capacity

The 1/4" x 3/8" mini split line set is commonly used for 0.75 ton to 1.0 ton systems and many 9,000 BTU to 12,000 BTU applications. Final line set selection should always follow the HVAC equipment manufacturer’s installation manual.

Why Choose Dabund 50 ft 1/4" x 3/8" Mini Split Long Line Set?

Manufacturing Experience Since 2008

Dabund is a manufacturer of mini split line sets, insulated copper pipe, aluminum pipe and HVAC parts. With production and export experience since 2008, Dabund supports HVAC customers in global markets.

Individual Pre-Insulated Rolls

Individual pre-insulated rolls are designed to fit ductless mini split, VRF, heat pump and unitary system installations, helping contractors and distributors select suitable products for different HVAC projects.

Competitive B2B Supply

Dabund provides quality HVAC products with competitive pricing, professional service, OEM printing and custom packaging support for wholesalers, suppliers and private-label brands.

Dabund Factory

Dabund produces insulated copper pipe, mini split line set, aluminum pipe and HVAC parts for global customers.

SGS Certificate

Mini split line set insulation can be made with polypropylene or black rubber with UV resistance, meeting ASTM E84, UL94, ASTM D1056 and ASTM G21 requirements.

Exhibition

Dabund joins HVAC exhibitions worldwide to present mini split line set and HVAC parts to customers face to face.

FAQ

What is a 50 ft 1/4" x 3/8" mini split long line set used for?

It is used to connect indoor and outdoor units in ductless mini split air conditioners, heat pumps and split HVAC systems where a longer refrigerant line run is required.

What does 1/4" x 3/8" mean?

It refers to the outer diameters of the two copper refrigerant lines. The 1/4" tube is generally the liquid line, and the 3/8" tube is generally the suction line.

What AC capacity is this 1/4" x 3/8" line set commonly used for?

This line set size is commonly used for 0.75 ton to 1.0 ton mini split systems, including many 9,000 BTU to 12,000 BTU air conditioner applications.

Is this long line set compatible with all mini split brands?

It works with many ductless mini split and HVAC systems in the US and global markets. Always confirm line size, length limit and refrigerant requirements with the equipment manufacturer.

Can this line set be trimmed to fit custom installations?

Yes. The copper tubing can be cut to length as needed. Proper cutting, deburring, flaring and sealing are required to maintain leak-proof connections.

Is additional insulation required for outdoor installations?

The factory pre-insulation is suitable for many outdoor HVAC runs. For extreme weather or long-term UV exposure, an additional protective conduit or line set cover is recommended.

Is this line set compatible with R410A and R32 refrigerants?

Yes. This mini split line set can be used with common HVAC refrigerants such as R410A and R32 when installed according to system and local code requirements.

Can Dabund provide other line set sizes and lengths?

Yes. Dabund can provide multiple sizes including 1/4 + 3/8, 1/4 + 1/2, 1/4 + 5/8, 3/8 + 5/8, 3/8 + 3/4 and 3/8 + 7/8, with different lengths and insulation thickness options.

Are you a trading company or manufacturer?

Dabund is a manufacturer of mini split line sets, insulated copper pipe, aluminum pipe and HVAC parts.

Can I get a free sample?

Yes. Dabund can provide qualified customers with 3 pieces of free samples. Express cost may need to be covered by the buyer. You can request samples through the free sample page.

Can I print my logo?

Yes. Dabund accepts OEM and ODM orders, including logo printing, insulation marking and customized packaging.

What payment terms are available?

Payment terms may include T/T, L/C at sight, credit card and other agreed payment methods depending on order details.

What delivery terms can you offer?

Dabund can offer common international trade terms such as EXW, FOB, CFR and CIF.

How long is your delivery time?

Normal delivery time is usually 15 to 20 days. For urgent orders, production and shipment can be arranged in advance according to factory schedule.