50 ft 3/8″ x 5/8″ Mini Split Long Line Set – Insulated Copper Refrigerant Lines

50 ft 3/8" x 5/8" Mini Split Long Line Set

The 50 ft 3/8" x 5/8" mini split long line set is a pre-insulated copper refrigerant line set designed for extended-distance mini split, ductless air conditioner and heat pump installations.

This long HVAC line set includes a 3/8" liquid line and 5/8" suction line with factory-applied white PE insulation. It helps maintain stable refrigerant flow, reduce heat transfer, prevent condensation and simplify long indoor-to-outdoor unit connections.

Dabund supplies insulated copper refrigerant lines, mini split line sets and HVAC installation parts for contractors, wholesalers, distributors, importers and private-label HVAC brands.

Product Overview: Long Line Set for Extended Mini Split Installations

The 50 ft 3/8" x 5/8" mini split long line set is engineered for installations where standard line lengths are not enough. It provides a continuous pre-insulated copper tubing solution for residential and light commercial HVAC projects.

A longer line set gives installers more flexibility when the outdoor condenser must be placed farther from the indoor unit, such as second-floor rooms, multi-room layouts, balcony installations and projects with routing limitations.

Key Features of 50 ft 3/8" x 5/8" Mini Split Line Set

• 50 ft long line set for extended mini split and heat pump installation.

• 3/8" liquid line and 5/8" suction line for compatible HVAC systems.

• Factory-insulated copper tubing helps reduce heat gain, heat loss and condensation.

• 99.9% pure copper supports stable refrigerant flow and long-term durability.

• White PE insulation provides moisture protection and outdoor installation support.

• Continuous long line run helps reduce extra couplings and potential leak points.

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

• Available with custom insulation thickness, length, logo printing and packaging.

• Designed for HVAC contractors, wholesalers and private-label buyers.

Long 50 ft Length for Flexible HVAC Layouts

A 50 ft mini split line set is useful when the indoor evaporator and outdoor condenser are separated by a longer distance. It helps reduce the need for on-site extensions, brazed joints or additional couplings.

• Ideal for longer indoor-to-outdoor unit distances.

• Suitable for second-floor and multi-room installation layouts.

• Helps support clean, continuous refrigerant line routing.

• Reduces extra connection points and potential refrigerant leak risks.

Standard 3/8" x 5/8" Line Sizes

3/8" Liquid Line

The 3/8" copper tube is commonly used as the liquid line in compatible HVAC systems, carrying refrigerant from the outdoor unit toward the indoor evaporator coil.

5/8" Suction Line

The 5/8" copper tube is commonly used as the suction line, returning refrigerant vapor from the indoor unit to the outdoor compressor.

The 3/8" x 5/8" line set is commonly used for 3.0 ton to 4.0 ton ductless mini split and heat pump systems, including many 36,000 BTU to 48,000 BTU applications. Final sizing should always follow the HVAC equipment manufacturer’s installation manual.

High-Quality Insulated Copper Tubing

99.9% Pure Copper for HVAC Performance

The copper tubing is manufactured from 99.9% pure copper to support excellent thermal conductivity, corrosion resistance, pressure performance and reliable refrigerant transfer in modern HVAC systems.

Factory-Applied Insulation for Energy Efficiency

Closed-cell factory insulation helps reduce heat gain and heat loss along the refrigerant line. It also helps prevent condensation and saves installation time compared with field-applied insulation.

UV-Resistant Insulation for Indoor and Outdoor Use

The white PE insulation jacket is designed for indoor and outdoor HVAC line runs, helping protect the copper tubing from sunlight, weather exposure, moisture and normal installation wear.

Compatibility and Applications

This 50 ft mini split long line set is suitable for HVAC installations where a longer refrigerant line run is required between indoor and outdoor units.

• Mini split air conditioners.

• Ductless heat pump systems.

• Residential HVAC installations.

• Light commercial HVAC projects.

• Extended line run replacement projects.

• HVACR distributor and contractor inventory.

The copper tubing and insulation are suitable for common refrigerants such as R410A, R32 and similar HVAC refrigerants when installed according to system specifications and local HVAC code requirements.

Benefits of a 50 ft Mini Split Long Line Set

Fewer Connections and Lower Leak Risk

A single 50 ft line set can reduce the need for couplings or extensions, minimizing potential refrigerant leak points and improving installation reliability.

Cleaner Installation Appearance

Continuous pre-insulated refrigerant lines provide a neater, more professional installation compared with joined or spliced line sets.

Better Routing Flexibility

Longer refrigerant lines give contractors more options when routing around walls, floors, balconies, outdoor brackets and building structures.

99.9% Pure Copper

White PE Insulated Pipe

Plastic Cap Protection

Three-Layer Insulation Structure

The mini split long line set uses a durable insulation structure designed for corrosion resistance, flame-retardant options, thermal insulation, waterproofing, shock absorption, noise reduction and long-term HVAC service.

Outer Layer: Embossed PE Film

The outer layer uses anti-aging, UV-resistant PE film with an embossed surface to improve wear resistance and outdoor durability.

Middle Layer: IXPE Foam

The middle layer uses dense-cell IXPE foam for heat resistance, cold resistance, impact absorption, water resistance and thermal insulation.

Inner Layer: Closed-Cell Moisture Barrier

The inner closed-cell layer improves air tightness and moisture protection, helping maintain insulation performance in the -40℃ to 120℃ temperature range.

Thermal Insulation Pipe Production

Insulation Pipe Warehouse

Inner Layer Insulated Pipe

Technical Specifications

Installation Tips for Long Line Sets

Verify Maximum Line Length Before Installation

Always confirm that the total refrigerant line length complies with the mini split manufacturer’s specifications. Long line runs may require correct refrigerant charge adjustment.

Avoid Tight Bends and Insulation Damage

Plan routing carefully to maintain smooth bends. Avoid kinking the copper tubing or damaging the insulation jacket during installation.

Secure Lines Properly for Long Runs

Use suitable clamps, brackets or line set covers to support tubing over longer distances and reduce vibration, movement or mechanical stress.

50 ft 3/8" x 5/8" Mini Split Long Line Set for HVACR Wholesalers

Dabund Pipe in-house tested insulated copper pipe and tubing is designed to make HVAC installation simple and quick, helping contractors save time and reduce cost on each job.

For distributors, importers and private-label HVAC brands, Dabund supports bulk production, custom insulation thickness, product marking, logo printing and customized export packaging.

Mini Split Line Set Size Options

Recommended Applications by AC Capacity

Why Choose This 50 ft 3/8" x 5/8" Mini Split Line Set?

Built for Efficiency and Durability

With pure copper tubing, durable insulation and extended length, this long line set supports efficient system operation, easier installation and long-term reliability.

Manufacturer Support from Dabund Pipe

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

OEM and Bulk Supply Available

Dabund supports OEM branding, private-label packaging, customized product marking and bulk production for HVAC wholesalers and importers.

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 of 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 installation products to customers face to face.

FAQ

What is a 50 ft 3/8" x 5/8" mini split long line set used for?

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

What does 3/8" x 5/8" mean in a mini split line set?

It refers to the outer diameters of the two copper refrigerant lines. The 3/8" line is commonly the liquid line, and the 5/8" line is commonly the suction line.

What AC capacity is 3/8" x 5/8" commonly used for?

The 3/8" x 5/8" line set is commonly used for 3.0 ton to 4.0 ton ductless mini split systems and many 36,000 BTU to 48,000 BTU applications.

When should I choose a 50 ft long line set?

Choose a 50 ft line set when the distance between the indoor and outdoor units exceeds standard shorter lengths or when routing requires additional flexibility. Always confirm the maximum line length allowed by the AC manufacturer.

Is additional insulation required?

In most standard installations, no additional insulation is required because the line set comes with factory-applied insulation. Local codes or harsh environments may require additional protection.

Is this line set compatible with R410A and R32 refrigerants?

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

Can this line set be shortened during installation?

Yes. The copper tubing can be cut to the required length, but proper cutting, deburring, flaring and sealing methods must be used to maintain refrigerant system integrity.

Can Dabund provide other sizes and lengths?

Yes. Dabund can provide multiple mini split line set sizes and lengths, including 15 m, 20 m, 25 m, 30 m and 50 m, with different 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, brand 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 according to factory schedule.