-
DBJ-003
-
DABUND
-
Copper
-
1M - 50M
Material
Color
Keywords
Application
1/4" x 1/2" Mini Split Line Set for HVAC Systems
The DABUND 1/4" x 1/2" mini split line set is an insulated copper refrigerant line solution for ductless mini split air conditioners, heat pumps, centralized HVAC systems, and residential or commercial cooling projects. It combines a 1/4" liquid line and a 1/2" suction line with factory-applied insulation to support stable refrigerant flow, energy efficiency, and long-term durability.
Manufactured from 99.9% pure copper and protected with UV-resistant insulation, this HVAC copper line set is commonly used for 1.5 ton to 2.0 ton systems, including 12000 BTU to 18000 BTU mini split air conditioners. It is suitable for HVAC contractors, wholesalers, distributors, importers, and OEM brands.
Product Overview – Insulated Copper Refrigerant Line Set
This 1/4" x 1/2" mini split line set consists of two insulated copper tubes bundled together for easier handling, transportation, and installation. Compared with separate copper tubes, the paired line set helps installers save time and maintain a cleaner installation layout.
Liquid line: 1/4 inch / 6.35 mm
Suction line: 1/2 inch / 12.7 mm
Copper purity: 99.9%
Available lengths: 15m / 20m / 25m / 30m / 50m
Insulation: black rubber / PE / polypropylene foam options
Application: mini split AC, heat pump, HVAC, and refrigeration systems
Key Features of 1/4" x 1/2" Mini Split Line Set
99.9% Pure Copper for Efficient Refrigerant Flow
The copper tubing is made from high-purity copper to provide excellent thermal conductivity, stable refrigerant transmission, corrosion resistance, and long service life in HVAC refrigerant piping applications.
ASTM B280 and C12200 Copper Tubing Support
The insulated copper line set can be produced according to ASTM B280 and C12200 copper tubing requirements, helping meet professional HVAC and refrigeration installation needs.
High Pressure Rating for Modern Refrigerants
With a pressure rating range of 2100–7000 PSI according to specification, this mini split line set can support modern HVAC refrigerants such as R410A and R32 when the pipe size, wall thickness, installation process, and system requirements match.
Advanced Insulation for Energy Saving
The closed-cell insulation helps reduce heat transfer, prevent condensation, maintain refrigerant temperature stability, and improve the overall efficiency of air conditioning and heat pump systems.
UV-Resistant and Flame-Retardant Design
The insulation can meet ASTM E84, UL94, ASTM D1056, and ASTM G21 requirements according to material and specification. It is designed for outdoor durability, UV protection, moisture resistance, and safer HVAC installation.
99.9% Pure Copper
Black Rubber Insulated Pipe
Plastic Cap Protection
Pipe Insulation Tubing Features
The pipe insulation is designed to protect the copper refrigerant line from heat gain, condensation, moisture, UV exposure, and outdoor wear. Black rubber insulation is especially suitable for applications requiring better flexibility and moisture protection.
Material option: black rubber insulation
Temperature range: -40°C to 120°C
Better moisture condensation protection
Insulation layer and moisture-proof layer combined in one structure
No additional vapor permeation protective layer required in many HVAC applications
Excellent Heat Preservation
The high-density closed-cell structure helps reduce thermal conductivity and maintain stable refrigerant temperature, even when the line set is installed in cold or hot outdoor environments.
Eco-Friendly and Durable Material
The insulation material is designed to reduce mold growth risk, resist corrosion, support acid and alkali resistance, and extend the service life of the copper pipe in HVAC installation environments.
Flame-Retardant Performance
The insulation can include flame-retardant materials and supports a working temperature range from -40°C to 120°C, helping improve safety and stability in HVAC applications.
Moisture and Condensation Protection
The insulation layer also functions as a moisture-proof layer, helping prevent condensation and protect the copper refrigerant line during long-term operation.
1/4" x 1/2" Mini Split Line Set for HVACR Applications
DABUND in-house tested insulated copper pipe and tubing is designed to make installation simple and quick, helping HVAC installers save time and labor costs on each job. It is suitable for wholesalers, suppliers, contractors, and HVAC system brands.
Technical Specifications
| Parameter | Details |
|---|---|
| Product Name | 1/4" x 1/2" Mini Split Line Set |
| Product Type | Insulated copper refrigerant line set |
| Liquid Line | 1/4 inch / 6.35 mm |
| Suction Line | 1/2 inch / 12.7 mm |
| Copper Material | 99.9% pure copper |
| Available Lengths | 15m / 20m / 25m / 30m / 50m, or customized length |
| Insulation Type | Black rubber / PE / polypropylene foam options |
| Working Temperature | -40°C to 120°C |
| Pressure Rating | 2100–7000 PSI, according to specification |
| Common Application | Mini split AC, heat pump, centralized HVAC, refrigeration |
| Common Capacity Range | 1.5–2.0 ton / 12000–18000 BTU, depending on system requirements |
| Standards | ASTM B280, C12200, ASTM E84, UL94, ASTM D1056, ASTM G21 |
Mini Split Line Set Size Options
| Size | Length | Insulation Black Rubber | Flame Resistant |
| 1/4 + 3/8 | 15m / 20m / 25m / 30m / 50m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 1/4 + 1/2 | 15m / 20m / 25m / 30m / 50m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 1/4 + 5/8 | 15m / 20m / 25m / 30m / 50m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 3/8 + 5/8 | 15m / 20m / 25m / 30m / 50m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 3/8 + 3/4 | 15m / 20m / 25m / 30m / 50m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 1/2 + 3/4 | 15m / 20m / 25m / 30m / 50m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
| 3/8 + 7/8 | 15m / 20m / 25m / 30m / 50m | 8mm / 9mm / 10mm / 13mm / 19mm / 25.4mm | M1 / B1 |
Line Set Size and HVAC Capacity Reference
| Line Set Size | Common Ton / HP Range | Common BTU Range | Typical Application |
|---|---|---|---|
| 1/4 + 3/8 | 0.75 ton – 1.0 ton / 0.75P – 1P | 9000–12000 BTU / 9K–12K | Small mini split air conditioner |
| 1/4 + 1/2 | 1.5 ton – 2.0 ton / 1.5P – 2P | 12000–18000 BTU / 12K–18K | Medium mini split air conditioner |
| 1/4 + 5/8 | 2.0 ton – 2.5 ton / 2P – 2.5P | 24000–30000 BTU / 24K–30K | Split AC and heat pump system |
| 3/8 + 5/8 | 3.0 ton – 4.0 ton / 3P – 4P | 36000–48000 BTU / 36K–48K | Ductless commercial air conditioner |
| 3/8 + 3/4 | 4.5 ton – 6.0 ton / 4.5P – 6P | 54000–72000 BTU / 54K–72K | Large split AC installation |
| 3/8 + 7/8 | 6.0 ton – 8.0 ton / 6P – 8P | 72000–96000 BTU / 72K–96K | High-capacity ductless HVAC system |
Applications – Designed for HVAC and Mini Split Systems
The 1/4" x 1/2" insulated copper line set is widely used in medium-capacity HVAC systems where efficient refrigerant flow, stable insulation, and easy installation are required.
Mini split air conditioners
Heat pump systems
Centralized HVAC systems
Residential cooling projects
Commercial HVAC installations
Refrigeration piping applications where specifications match
Benefits of Pre-Insulated Copper Line Sets
Improved Energy Efficiency
The insulation helps maintain refrigerant temperature and reduce heat transfer, supporting more stable cooling performance.
Moisture and Condensation Protection
The insulated structure works as both a thermal barrier and a moisture barrier, helping reduce condensation damage in humid or outdoor environments.
Faster Installation
Paired and pre-insulated tubing reduces preparation work, saves installation time, and helps contractors complete HVAC projects more efficiently.
Long-Term Durability
Copper’s corrosion resistance combined with durable insulation helps extend the service life of the refrigerant line set.
OEM and Customization Services
DABUND provides OEM and ODM solutions for HVAC brands, wholesalers, distributors, importers, and contractors. Custom specifications can be supplied according to installation requirements and market demand.
Custom lengths from 1m to 50m
Custom copper pipe size combinations
Insulation thickness and material options
Logo printing on insulation
Bulk packaging for distributors
Private label packaging for HVAC brands
DABUND Factory
We produce insulated copper pipe, mini split line set, aluminum pipe, and HVAC parts for global HVAC customers.
SGS Certificate
DABUND mini split line set insulation can be made of polypropylene or black rubber with UV resistance and can meet ASTM E84, UL94, ASTM D1056, and ASTM G21 standards according to product specification.
Exhibition
DABUND joins HVAC exhibitions worldwide to help customers evaluate mini split line sets, insulated copper tubes, and HVAC parts face to face.
FAQ
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 between the condenser and evaporator in mini split air conditioners, heat pumps, and compatible refrigeration systems.
What size air conditioner uses a 1/4" x 1/2" line set?
A 1/4" x 1/2" line set is commonly used for 1.5 ton to 2.0 ton mini split air conditioning systems, including 12000 BTU and 18000 BTU units. Always confirm the required line size with the AC manufacturer before installation.
Why is copper used for HVAC line sets?
Copper provides excellent thermal conductivity, corrosion resistance, pressure resistance, and durability, making it a preferred material for HVAC refrigerant piping.
Why is insulation important for refrigerant line sets?
Insulation reduces heat transfer, improves system efficiency, prevents condensation, and protects the copper pipe in humid, outdoor, or temperature-sensitive environments.
Is this mini split line set compatible with R410A refrigerant?
Yes. The copper line set can support R410A and R32 systems when the pipe size, wall thickness, pressure rating, and installation method meet the HVAC equipment requirements.
Can this insulated copper line set be used outdoors?
Yes. The insulation is designed for UV resistance, moisture protection, flame-retardant performance, and outdoor durability according to the selected specification.
What standards does this copper line set meet?
The product can meet ASTM B280, C12200, ASTM E84, UL94, ASTM D1056, and ASTM G21 requirements according to the selected copper tube and insulation specification.
Can I customize the mini split line set?
Yes. DABUND supports OEM customization, including custom length, pipe size combination, insulation material, insulation thickness, logo printing, and private label packaging.
How do I choose the correct HVAC line set size?
The correct size depends on air conditioner capacity, refrigerant type, installation distance, elevation difference, and manufacturer requirements. Always follow the installation manual to avoid efficiency loss or system damage.
Who should buy this 1/4" x 1/2" mini split line set?
This product is suitable for HVAC contractors, mini split system brands, importers, wholesalers, distributors, project suppliers, and professional installers who need insulated copper refrigerant lines for 12K–18K HVAC systems.
