1/4" x 1/2" Mini Split Line Set – Insulated Copper Refrigerant Line for HVAC Systems

This 1/4" x 1/2" mini split line set is a premium HVAC refrigerant solution designed for ductless air conditioners, heat pumps, and centralized systems. Made from 99.9% pure copper with factory-applied insulation, it ensures efficient refrigerant flow, energy savings, and long-term durability for residential and commercial installations

1/4" x 1/2" Mini Split Line Set is two tubes tied together with insulating tape, unlike White Embossed Copper Tube, two tubes can be glued together. For the convenience of transportation, we will pack the tubes very neatly and beautifully. So buy it now.

Product Overview – High-Performance HVAC Copper Line Set

This mini split line set consists of a 1/4" liquid line and 1/2" suction line, bundled together for easy installation.

• Copper Purity: 99.9% (ASTM B280 & C12200)

• Available Lengths: 15m / 20m / 25m / 30m / 50m

• Insulation: UV-resistant polypropylene / PE foam

• Application: Mini split AC, heat pump, HVAC systems

It is one of the most commonly used configurations for medium-capacity HVAC systems.

Key Features of 1/4" x 1/2" Mini Split Line Set

99.9% Pure Copper for Maximum Efficiency

Manufactured with high-grade copper compliant with ASTM B280 and C12200, ensuring excellent thermal conductivity, corrosion resistance, and extended service life.

High Pressure Rating for Modern Refrigerants

With a pressure rating of 2100–7000 PSI, this line set supports modern refrigerants such as R410A and R32, ensuring safe and stable HVAC operation.

Advanced Insulation for Energy Saving

The insulation features closed-cell polyethylene or polypropylene foam, reducing heat transfer and improving overall system efficiency.

UV-Resistant & Flame-Retardant Design

The insulation meets multiple international standards:

• ASTM E84

• UL94

• ASTM D1056

• ASTM G21

Providing excellent fire resistance, UV protection, and durability for outdoor use.

Technical Specifications

Copper Tube Dimensions

• Liquid Line: 1/4 inch (6.35 mm)

• Suction Line: 1/2 inch (12.7 mm)

Insulation & Temperature Range

• Insulation Type: High-density closed-cell foam

• Working Temperature: -40°C to 120°C

Compliance Standards

• ASTM B280 (Copper tubing)

• ASTM E84 (Fire resistance)

• UL94 (Flame retardant)

• ASTM D1056 / G21

These certifications ensure high performance, safety, and reliability in HVAC applications.

99.9% Pure Copper

Black Rubber Insulated Pipe

Plastic Cap

Features of pipe insulation tubing:

● Pipe Insulation, Material Black Rubber, Temp Range -40 Degrees to 120 Degrees.

● The pipe insulation has a better function of moisture condensation. Insulation material is both the insulation layer and moisture-proof layer.

● There is no need to drop the water vapor permeation protective layer so that it has a better moisture condensation function.

Excellent Heat Preservation Insulation: The high density and closed structure of selected raw material has the ability of low thermal conductivity and stable temperature，so the inside of the copper liquid pipe will not be affected even if the weather is frozen outside

Eco-friendly Material: The environmental friendly raw material has no stimulation and pollution, it can avoid the mold growth and mouse biting; The material has the effection of corrosion-resistant, acid and alkali, it can increase the life of using

Excellent Flame Retardant Properties: The material contains a large amount of flame-retardant cigarette raw materials, and the bath fire is not easy to burn and melt, the range of Using temperature is from -40℃ to 120℃

Moisture Condensation: Insulation material is both the insulation layer and moisture-proof layer. There is no need to drop the water vapor permeation protective layer so that it has a better moisture condensation function.

The pipe insulation has many functions such as Heat Preservation Ability, Environmental pollution free, Good flame retardant properties and so on. Besides, it can make your home more tidy and protect the copper pipe in summer.

The pipe insulation has many functions such as Heat Preservation Ability, Environmental pollution free, Good flame retardant properties and so on. Besides, it can make your home more tidy and protect the water pipe whenever summer or copper pipe.

1/4" x 1/2" Mini Split Line Set for HVACR Applications Wholesaler & Supplier

DABUND PIPE in-house tested insulate copper pipe and tubing is designed to make installation simple and quick – saving you time and money on each job.

Mini Split Line Set

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

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

1/4 + 5/8 Insulated copper piping 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 piping 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 Mini split line set used for 54000 BTU and 72000 split air conditioner installation.

3/8 + 7/8 Insulated copper pipe 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 Mini split line set used for 54K and 72K split air conditioner installation.

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

Applications – Designed for HVAC & Mini Split Systems

This insulated copper line set is widely used in:

• Mini split air conditioners

• Heat pump systems

• Centralized HVAC systems

• Residential and commercial cooling projects

Typically suitable for 1.5–2 ton (12,000–18,000 BTU) air conditioning systems.

Benefits of Pre-Insulated Copper Line Sets

Improved Energy Efficiency

Maintains refrigerant temperature and enhances cooling performance.

Moisture & Condensation Protection

Acts as both insulation and vapor barrier, preventing condensation damage.

Faster Installation

Pre-insulated and paired tubing reduces installation time and labor cost.

Long-Term Durability

Copper’s corrosion resistance combined with robust insulation ensures extended service life.

OEM & Customization Services

We offer flexible OEM/ODM solutions:

• Custom lengths (1m–50m)

• Insulation thickness & material options

• Logo printing on insulation

• Bulk packaging for distributors

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 a 1/4" x 1/2" mini split line set used for?

It is used to connect indoor and outdoor units in HVAC systems, allowing refrigerant to circulate efficiently in mini split air conditioners and heat pumps.

2.What size air conditioner uses a 1/4" x 1/2" line set?

This size is commonly used for 1.5–2 ton (12,000–18,000 BTU) mini split air conditioning systems.

3. Why is copper used for HVAC line sets?

Copper provides excellent thermal conductivity, corrosion resistance, and durability, making it the preferred material for refrigerant piping.

4.Why is insulation important for refrigerant line sets?

Insulation reduces heat loss, improves system efficiency, and prevents condensation, especially in humid or outdoor environments.

5.Is this line set compatible with R410A refrigerant?

Yes, it supports modern refrigerants like R410A and R32 due to its high pressure rating and ASTM compliance.

6.Can this insulated copper line set be used outdoors?

Yes, the insulation is UV-resistant, flame-retardant, and weatherproof, making it suitable for outdoor installations.

7.What standards does this copper line set meet?

It complies with ASTM B280, ASTM E84, UL94, and ASTM D1056, ensuring safety and reliability.

8.Can I customize the mini split line set?

Yes, OEM customization is available, including length, insulation type, branding, and packaging.

9.How do I choose the correct HVAC line set size?

The correct size depends on your air conditioner capacity (BTU/tonnage). Always follow manufacturer specifications to ensure optimal performance and efficiency.