The 82 ft 1/4" x 3/8" mini split long line set is designed for HVAC installations that require extended refrigerant piping between indoor and outdoor units. This insulated copper line set ensures efficient refrigerant flow and reliable system performance in ductless mini split air conditioners, heat pumps, and refrigeration systems.

Manufactured from 99.9% pure copper tubing, the line set offers excellent heat transfer, corrosion resistance, and long-term durability. It complies with ASTM B280 and C12200 standards, making it suitable for modern HVAC refrigerants such as R410A and R32.

The 82-foot length is ideal for installations where the condenser and evaporator units are located far apart, such as multi-story buildings or complex residential layouts.

The Mini Split Long Line Set is twin already. So buy it now.

Product Specifications of the 82 ft Mini Split Long Line Set

This HVAC copper line set is manufactured according to international air conditioning standards.

Technical Specifications

• Pipe Size: 1/4 inch + 3/8 inch (6.35 mm + 9.52 mm)

• Length: 82 ft (25 m)

• Copper Material: 99.9% Pure Copper (C12200)

• Copper Standard: ASTM B280

• Insulation Material: Polypropylene or Black Rubber Insulation

• Working Temperature: -40℃ to 120℃

• Flame Resistance: UL94 / ASTM E84 compliant

These specifications ensure reliable operation in both residential and commercial HVAC installations.

Designed for 9000–12000 BTU Mini Split Air Conditioners

The 1/4" liquid line and 3/8" suction line combination is widely used for 0.75 ton to 1 ton mini split air conditioning systems, which typically correspond to 9,000–12,000 BTU cooling capacity.

This pipe size is commonly installed in:

• Residential ductless mini split systems

• Small office air conditioning units

• Heat pump systems

• Compact HVAC refrigeration equipment

Choosing the correct line set size ensures optimal refrigerant circulation and system efficiency.

High-Purity Copper Tubing for Reliable Refrigerant Flow

Copper remains the preferred material for HVAC refrigerant piping systems because of its excellent physical and thermal properties.

Advantages include:

• Superior thermal conductivity for efficient heat transfer

• High resistance to corrosion and oxidation

• Strong pressure tolerance for modern refrigerants

• Long service life compared with alternative materials

These characteristics make copper tubing the industry standard for mini split line sets and refrigeration piping.

Factory-Insulated Copper Pipe for Maximum Energy Efficiency

The mini split long line set features factory-applied insulation, which improves thermal performance and protects the copper tubing.

Benefits of insulated copper pipe include:

• Reduces heat loss during refrigerant circulation

• Prevents condensation from forming on pipe surfaces

• Protects copper pipes from environmental damage

• Improves overall HVAC energy efficiency

The insulation also simplifies installation by eliminating the need for additional field wrapping.

99.9% Pure Copper

White PE Insulated Pipe

Plastic Cap

Features of pipe insulation tubing:

Machines for the production of thermal insulation pipes

warehouse for insulation pipes

Inner Layer Insulated Pipe

Flexible Copper Coil Design for Easy HVAC Installation

The 82 ft copper line set is supplied in a flexible coil, making it easier for HVAC technicians to install in complex building structures.

Installation advantages include:

• Easy routing through walls and ceilings

• Reduced number of joints and connections

• Faster installation time

• Lower risk of refrigerant leakage

This flexibility makes it ideal for long-distance HVAC installations.

Wide Applications for HVAC and Refrigeration Systems

The 1/4" x 3/8" mini split long line set is suitable for various HVAC and refrigeration applications, including:

• Ductless mini split air conditioners

• Heat pump systems

• VRF and VRV air conditioning systems

• Residential HVAC installations

• Commercial refrigeration equipment

Its extended length makes it particularly useful in installations where indoor and outdoor units are located far apart.

Multiple Insulation Options for Different Installation Environments

To meet different installation requirements, the mini split line set is available with multiple insulation options.

White PE Insulation Thickness

• 8 mm

• 9 mm

• 10 mm

• 13 mm

• 19 mm

• 25.4 mm

These options allow HVAC installers to select the appropriate insulation based on climate conditions and installation environment.

Mini Split Line Set

1/4 + 3/8 AC line set used for 0.75TON - 1.0TON mini split air conditioner.

1/4 + 1/2 Mini split line set used for 1.5TON - 2.0TON mini split air conditioning.

1/4 + 5/8 Copper line set used for 2.0TON - 2.5TON split air conditioner system.

3/8 + 5/8 Insulated copper tube apply for 3.0TON - 4.0TON ductless mini split air conditioner.

3/8 + 3/4 Insulated copper tubing used for 4.5TON - 6.0TON split air conditioner installation.

3/8 + 7/8 Insulated copper piping apply for 6.0TON - 8.0TON ductless mini split air conditioner.

Air conditioning copper line sets 1/4 + 3/8 used for 0.75P and 1P split air conditioning.

Copper pipe kit 1/4 + 1/2 commonly used for 1.5P and 2P mini split air conditioners.

1/4 + 5/8 Insulated copper line set used for 2P and 2.5air conditioner system.

3/8 + 5/8 Mini-split copper line set apply for 3P and 4P ductless mini split air conditioner.

3/8 + 3/4 Copper pipe kit used for 4.5P and 6P split aircon installation.

3/8 + 7/8 Insulated copper pipe apply for 6P - 8p TON ductless mini split air conditioner.

1/4 + 3/8 Mini split line set used for 9000BTU and 12000 BTU split air conditioner.

All copper line set 1/4 + 1/2 commonly used for 12000 BTU and 18000 BTU mini split air conditioners.

1/4 + 5/8 Insulated copper line set used for 24000 BTU and 30000 BTU air conditioner system.

3/8 + 5/8 Mini-split line set apply for 36000 BTU and 48000 ductless air conditioner.

3/8 + 3/4 HVAC lineset used for 54000 BTU and 72000 split air conditioner installation.

3/8 + 7/8 Insulated copper piping apply for 72000 BTU - 96000 BTU ductless mini split air conditioner.

Aircon copper line set 1/4 + 3/8 used for 9K and 12K split air conditioner.

High quality copper line set 1/4 + 1/2 commonly used for 12K and 18K mini split air conditioners.

1/4 + 5/8 Insulated copper line set used for 24K and 30K air conditioner system.

3/8 + 5/8 Mini-split line set apply for 36K and 48K ductless air conditioner.

3/8 + 3/4 HVAC lineset used for 54K and 72K split air conditioner installation.

3/8 + 7/8 Insulated copper pipe apply for 72K - 96K ductless mini split air conditioner.

Why Choose DABUND Mini Split Long Line Set

DABUND is a professional manufacturer of mini split line sets and HVAC copper tubing with extensive production and export experience.

Key advantages include:

• More than 14 years of manufacturing experience

• Large-scale production capacity

• Strict quality control and international standards

• Competitive factory pricing

DABUND products are widely exported to global HVAC markets and trusted by distributors and contractors worldwide.

DABUND FACTORY

We produce Insulated Copper Pipe, Mini Split Line Set and Aluminum Pipe and HVAC Parts

SGS Certificate

Mini Split Line Set is made of Polypropylene or Black Rubber with UV Resistant, meets ASTM E 84, UL94, ASTM D1056 and ASTM G 21

Exhibition

We join the exhibitions all over the word, just to facilitate customers to experience our mini split line set face to face.

FAQ

1. What is an 82 ft mini split long line set used for?

An 82 ft mini split long line set is used to connect the indoor and outdoor units of a ductless mini split air conditioner or heat pump system when a longer distance is required between the two units. The insulated copper pipes allow refrigerant to flow efficiently, ensuring proper cooling or heating performance even in large homes, multi-story buildings, or complex installation layouts.

2.What size mini split systems use a 1/4" x 3/8" line set?

A 1/4 inch liquid line and 3/8 inch suction line is commonly used for 9,000 BTU to 12,000 BTU mini split air conditioning systems. These systems are typically installed in bedrooms, small offices, apartments, and residential spaces where compact ductless air conditioning is required.

3.Why choose a long line set for HVAC installation?

A long line set provides more flexibility during HVAC installation. It allows installers to place the outdoor condenser unit farther away from the indoor unit, which is useful when dealing with building layout limitations, noise reduction requirements, or outdoor space constraints.

4.Why are copper pipes used in mini split line sets?

Copper pipes are the preferred material for HVAC refrigerant lines because they offer excellent thermal conductivity and durability. Copper tubing can handle high refrigerant pressure and provides efficient heat transfer between system components. It is also flexible and easy to bend, which makes installation easier for HVAC technicians.

5.Does the long line set come with insulation?

Yes. The mini split long line set comes with factory-applied insulation that helps maintain stable refrigerant temperatures during operation. The insulation also prevents condensation from forming on the pipe surface and protects the copper tubing from environmental damage.

6.Can the 82 ft copper line set be shortened during installation?

Yes. HVAC technicians can cut the 82 ft copper line set to match the required installation length. Trimming the pipe ensures a proper fit between the indoor and outdoor units and helps reduce unnecessary tubing that could affect system efficiency.

7.Is the insulated copper pipe compatible with modern refrigerants?

Yes. High-quality HVAC copper tubing manufactured according to ASTM B280 standards is compatible with modern refrigerants such as R410A and R32. These refrigerants require strong and durable copper piping capable of handling higher operating pressures.

8.How long can a mini split copper line set last?

A professionally installed mini split copper line set can last 20 years or more. Copper tubing is naturally resistant to corrosion and mechanical damage, while the insulation protects the pipe from environmental exposure, helping extend the lifespan of the HVAC system.

9.Can mini split long line sets be used for residential and commercial systems?

Yes. Mini split long line sets are suitable for both residential and light commercial HVAC systems. They are commonly used in homes, offices, retail spaces, and small commercial buildings where ductless air conditioning systems are installed.

10.Why choose a professional HVAC line set manufacturer?

Working with a professional HVAC line set manufacturer ensures consistent product quality, high-purity copper materials, and durable insulation. Experienced manufacturers also provide OEM customization, strict quality testing, and international certifications, making their products suitable for HVAC distributors and contractors worldwide.