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DBJ-003
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DABUND
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Copper
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1M - 50M
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1/4 3/8 5/8 3/4 1/2 7/8 1-1/8
Material
Color
Keywords
Application
Thickness
Service
Packing
3/8" x 3/4" Mini Split Refrigerant Line Set for HVAC Systems
The 3/8" x 3/4" mini split refrigerant line set from Dabund is a premium HVAC copper line set designed for ductless mini split air conditioners, heat pumps, split AC systems, and central HVAC applications. It includes a 3/8 inch liquid line and a 3/4 inch suction line, making it suitable for medium-to-large HVAC systems requiring stable refrigerant flow.
Made with 99.9% pure copper tubing and factory-applied UV-resistant insulation, this pre-insulated copper line set helps reduce heat loss, prevent condensation, protect refrigerant lines, and simplify professional HVAC installation.
Overview – Reliable Refrigerant Lines for HVAC and Mini Split Systems
This 3/8" x 3/4" HVAC refrigerant line set consists of two semi-flexible copper tubes with factory-applied insulation. It is engineered to connect outdoor condensers and indoor evaporators in modern HVAC systems, supporting residential and commercial installation projects.
3/8" liquid refrigerant line
3/4" suction refrigerant line
99.9% pure copper tubing
Factory-applied UV-resistant insulation
Suitable for mini split AC, heat pump, ductless HVAC, and central HVAC systems
Available in standard and custom lengths
High-Purity 99.9% Copper Tubing for Superior Performance
The line set uses 99.9% pure copper tubes that comply with ASTM B280 and C12200 standards. High-purity copper provides excellent thermal conductivity, stable refrigerant circulation, corrosion resistance, and reliable long-term performance in HVAC applications.
Excellent Refrigerant Flow
Smooth copper tubing supports efficient refrigerant flow between indoor and outdoor units, helping the HVAC system maintain stable cooling and heating performance.
Strong Pressure Resistance
The copper tubing is designed for high-pressure HVAC systems and supports a pressure handling range from 2100 to 7000 PSI, far above common operating requirements for many refrigerant systems.
Durable for Long-Term HVAC Use
Copper offers strong resistance to corrosion, vibration, pressure, and temperature changes, making it suitable for long-term refrigerant line service in residential and commercial installations.
Universal 3/8" x 3/4" Size for Larger Mini Split Systems
The 3/8" x 3/4" line set size is commonly used in medium-to-large mini split and traditional HVAC systems. The 3/8" copper tube is generally used as the liquid line, while the 3/4" copper tube is generally used as the suction line.
This configuration is often selected for systems around 4.5–6.0 tons or 54,000–72,000 BTU, depending on the HVAC brand, refrigerant type, line length, and installation requirements. Final sizing should always follow the equipment manufacturer’s installation manual.
Factory-Applied Insulation for Outdoor HVAC Installation
This mini split refrigerant line set is pre-insulated with UV-resistant polypropylene foam or PE insulation. Factory-applied insulation helps reduce energy loss, protect the copper tubing, prevent condensation, and simplify installation for HVAC technicians.
UV-resistant insulation for outdoor exposure
Moisture and condensation protection
Thermal insulation for better energy efficiency
Reduced need for field insulation wrapping
Suitable for indoor and outdoor HVAC line runs
The insulation can meet ASTM E84, UL94, ASTM D1056, and ASTM G21 standards depending on product configuration.
Wide Compatibility with Refrigerants and HVAC Models
This pre-insulated copper line set works with common HVAC refrigerants including R410A, R32, R22, and other refrigerants when the line size and pressure requirements match the HVAC equipment specifications.
Ductless mini split air conditioners
Heat pump systems
Central HVAC systems
Split air conditioner systems
Residential HVAC installations
Light commercial HVAC projects
Replacement and retrofit refrigerant line projects
99.9% Pure Copper
White PE Insulated Pipe
Plastic Cap Protection
Features of Pipe Insulation Tubing
The pipe insulation tubing is designed to protect the copper refrigerant line from heat transfer, moisture, condensation, sunlight, and installation wear. It helps maintain stable refrigerant temperature and improves overall HVAC system efficiency.
Thermal Insulation Pipe Production
Insulated Pipe Warehouse
Inner Layer Insulated Pipe
Key Features and Technical Highlights
Pressure and Durability Exceed Industry Requirements
With pressure handling from 2100 to 7000 PSI, this HVAC copper line set provides enhanced mechanical strength and safety for high-pressure refrigerant systems.
Available Lengths and Customization Options
Standard lengths include 15m, 20m, 25m, 30m, and 50m. Dabund also supports custom length, insulation thickness, insulation material, OEM branding, and insulation jacket printing.
Easy Installation Saves Time and Labor
The pre-insulated design reduces field insulation work, improves installation consistency, and helps HVAC technicians complete projects faster with fewer onsite errors.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | DBJ-003 |
| Brand | Dabund |
| Product Name | 3/8" x 3/4" Mini Split Refrigerant Line Set |
| Copper Tube Size | 3/8" Liquid Line + 3/4" Suction Line |
| Material | 99.9% Pure Copper Tubing |
| Insulation | UV-Resistant Polypropylene Foam / White PE Insulation |
| Working Temperature | -40℃ to 120℃ |
| Pressure Rating | 2100–7000 PSI |
| Standards | ASTM B280, C12200, ASTM E84, UL94, ASTM D1056, ASTM G21 |
| Applications | Mini Split AC, Heat Pump, Central HVAC Systems, Split Air Conditioner Systems |
| Available Lengths | 15m–50m, custom length available |
Available Mini Split Refrigerant Line Set Sizes
| Size | Length | Insulation White PE | 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 |
Mini Split Line Set Size Guide
| Line Set Size | Typical Ton Range | Typical BTU Range | Common Application |
|---|---|---|---|
| 1/4" + 3/8" | 0.75–1.0 Ton | 9,000–12,000 BTU | Small mini split air conditioner |
| 1/4" + 1/2" | 1.5–2.0 Ton | 12,000–18,000 BTU | Residential mini split system |
| 1/4" + 5/8" | 2.0–2.5 Ton | 24,000–30,000 BTU | Medium split air conditioner system |
| 3/8" + 5/8" | 3.0–4.0 Ton | 36,000–48,000 BTU | Large residential or light commercial HVAC |
| 3/8" + 3/4" | 4.5–6.0 Ton | 54,000–72,000 BTU | Commercial split AC installation |
| 3/8" + 7/8" | 6.0–8.0 Ton | 72,000–96,000 BTU | Large ductless HVAC system |
Why Choose Dabund Mini Split Line Set?
Quality Manufacturing Since 2008
Dabund has extensive experience producing HVAC copper pipes, mini split line sets, insulated copper pipes, aluminum pipes, and HVAC accessories. Stable production and export-ready manufacturing help support global buyers.
Proven Performance in HVAC Installations
This line set is designed for long-term durability, thermal efficiency, pressure resistance, and easy installation, helping reduce energy loss and improve HVAC system performance.
OEM and ODM Customization
Dabund supports custom length, insulation thickness, insulation material, logo printing, insulation marking, private label packaging, and bulk order supply for HVAC brands, distributors, and wholesalers.
Dabund Factory
Dabund produces insulated copper pipe, mini split line set, aluminum pipe, and HVAC parts for global HVAC buyers.
SGS Certificate
Mini split line set insulation can be made of polypropylene or black rubber with UV resistance and compliance with ASTM E84, UL94, ASTM D1056, and ASTM G21.
Exhibition and Global Market Experience
Dabund joins international exhibitions to help customers inspect mini split line sets, HVAC copper line sets, insulated copper pipes, and HVAC parts face to face.
FAQ About 3/8" x 3/4" Mini Split Refrigerant Line Set
What does 3/8" x 3/4" mean in a mini split line set?
It refers to the outer diameters of the two copper tubes. The 3/8" tube is usually used as the liquid refrigerant line, and the 3/4" tube is usually used as the suction line.
What HVAC system size uses a 3/8" x 3/4" line set?
A 3/8" x 3/4" line set is commonly used for larger systems around 4.5–6.0 tons or 54,000–72,000 BTU. The exact requirement depends on the HVAC equipment manufacturer’s specifications.
Is this line set compatible with R410A and R32 refrigerants?
Yes. The copper tubing and insulation are designed for high-pressure HVAC systems and can support common refrigerants such as R410A, R32, R22, and other refrigerants when system specifications match.
Do I need additional insulation in the field?
The line set comes factory-insulated with UV-resistant insulation, so additional insulation is not required for many standard installations. In harsh outdoor environments, extra protection may be recommended.
Can I order custom lengths or branding?
Yes. Dabund supports custom lengths, insulation thickness, insulation material, logo printing, insulation marking, and OEM packaging for distributors and HVAC brands.
Is this line set suitable for outdoor installation?
Yes. The UV-resistant insulation is suitable for outdoor HVAC line runs when installed with proper support, protection, and according to local installation requirements.
Can this line set be used for heat pump systems?
Yes. It can be used for compatible heat pump systems when the refrigerant line size, pressure rating, and system capacity match the equipment requirements.
What are your payment terms?
Common payment terms include T/T, L/C at sight, credit card, and other agreed payment methods based on order details.
What are your delivery terms?
Dabund can support EXW, FOB, CFR, CIF, and other international delivery terms according to customer requirements.
Are you a trading company or manufacturer?
Dabund is a manufacturer of mini split refrigerant line sets, insulated copper pipes, aluminum pipes, air conditioner installation kits, and HVAC parts.
Can I get samples before bulk ordering?
Yes. Dabund can provide samples for evaluation. Buyers usually need to cover the express shipping cost.
How long is your delivery time?
The usual delivery time is 15–20 days. For urgent orders, Dabund can discuss faster production and delivery arrangements according to order quantity and current production schedule.
