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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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1/4,3/8,1/2,5/8,3/4,7/8,1,1-1/8
Material
Color
Keywords
Application
3/8" x 3/4" Copper Line Set for HVAC Refrigerant Systems
The 3/8" x 3/4" copper line set from Dabund is designed for HVAC systems, mini split air conditioners, heat pumps, ductless cooling systems, and split AC installations. It includes a 3/8 inch liquid line and a 3/4 inch suction line, providing reliable refrigerant flow for larger residential and light commercial HVAC applications.
Made with 99.9% pure copper and factory-applied insulation, this pre-insulated HVAC refrigerant line set helps improve thermal efficiency, reduce condensation, protect the copper tubing, and simplify professional installation.
Product Overview – Pre-Insulated HVAC Copper Refrigerant Line Set
The 3/8" x 3/4" HVAC copper line set features twin copper tubes for liquid and suction refrigerant circulation. It is used to connect indoor evaporator units and outdoor condensers in split system HVAC installations.
3/8" liquid line for refrigerant feed
3/4" suction line for refrigerant return
99.9% pure copper tubing
Factory-applied insulation for thermal protection
Suitable for mini split, ductless AC, heat pump, central HVAC, and split systems
Designed for residential, commercial, and industrial HVAC installations
This size configuration is commonly used in larger HVAC systems where stable refrigerant flow, pressure performance, and efficient heat transfer are required. Final line set selection should follow the HVAC equipment manufacturer’s installation manual.
What Does 3/8" x 3/4" Copper Line Set Mean?
3/8" Liquid Line
The 3/8 inch copper tube is usually used as the liquid line. It carries high-pressure liquid refrigerant from the outdoor condenser to the indoor evaporator or air handler.
3/4" Suction Line
The 3/4 inch copper tube is usually used as the suction line. It returns low-pressure refrigerant vapor back to the compressor and supports higher refrigerant volume in larger HVAC systems.
Balanced Flow for Larger HVAC Systems
The 3/8" x 3/4" pairing is commonly selected for HVAC systems requiring larger suction capacity and stable refrigerant flow, including larger ductless mini split systems and split air conditioning installations.
High-Purity Copper Construction
99.9% Pure Copper Tubing
Dabund copper line sets are made from 99.9% pure copper tubing, meeting ASTM B280 and C12200 standards. High-purity copper provides excellent thermal conductivity, corrosion resistance, pressure stability, and long service life in HVAC refrigerant applications.
Excellent Thermal Conductivity
Copper’s strong heat transfer performance helps refrigerant move efficiently between indoor and outdoor units, supporting stable cooling and heating operation.
Durable for Long-Term HVAC Use
The copper tubing is flexible enough for professional routing while maintaining strength against pressure, vibration, corrosion, and installation stress.
Factory-Applied Insulation for Better HVAC Efficiency
Pre-Insulated for Thermal Protection
The line set comes with factory-applied insulation that helps reduce heat gain, heat loss, and surface condensation. Pre-insulated tubing also reduces field wrapping work and helps installers maintain consistent insulation quality.
Weather-Resistant and UV-Resistant Insulation
The insulation is designed for indoor and outdoor HVAC installations. It helps protect the copper line set from sunlight, moisture, condensation, installation abrasion, and temperature changes.
Certified Insulation Materials
The insulation materials can meet ASTM E84, UL94, ASTM D1056, and ASTM G21 standards. The operating temperature range can reach from -40℃ to 120℃ depending on insulation material and configuration.
Key Features and Benefits
Compatible with Multiple HVAC Systems
This copper line set can be used for mini split air conditioners, heat pumps, ductless HVAC systems, centralized HVAC units, and split air conditioning systems when the system specifications match the 3/8" x 3/4" line size.
Supports Common Refrigerants
The copper tubing is suitable for common HVAC refrigerants including R410A, R32, R22, and other refrigerants when installed according to equipment specifications and local codes.
High Pressure Capacity
The line set is designed with a pressure rating range of 2100–7000 PSI, supporting reliable performance under demanding HVAC operating conditions.
Easy Installation for HVAC Professionals
Pre-insulated copper tubing simplifies job site installation, reduces the need for extra field insulation, and supports cleaner routing through walls, outdoor areas, mechanical rooms, and tight spaces.
HVAC Compatibility and Applications
The 3/8" x 3/4" pre-insulated copper line set is suitable for a wide range of HVAC and refrigerant line applications.
Mini split air conditioner installation
Ductless HVAC systems
Heat pump refrigerant lines
Central ducted HVAC systems
Split air conditioning systems
Residential and commercial AC installations
HVAC replacement and retrofit projects
Long-distance refrigerant line installations
The 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, depending on equipment design and manufacturer requirements.
99.9% Pure Copper
White PE Insulated Pipe
Plastic Cap Protection
Features of Pipe Insulation Tubing
The insulation tubing protects the copper line set from heat transfer, condensation, moisture, UV exposure, and installation wear. It is especially important for suction lines because insulation helps prevent sweating and supports system efficiency.
Thermal Insulation Pipe Production
Insulated Pipe Warehouse
Inner Layer Insulated Pipe
Technical Specifications
| Feature | Specification |
|---|---|
| Product Name | 3/8" x 3/4" Copper Line Set |
| Line Size | 3/8" Liquid Line + 3/4" Suction Line |
| Material | 99.9% Pure Copper |
| Insulation | Factory-Applied, UV-Resistant Insulation |
| Applicable HVAC Types | Mini Split, Ductless AC, Heat Pump, Central HVAC, Split System |
| Refrigerant Compatibility | R410A, R32, R22, and other common refrigerants when specifications match |
| Pressure Rating | 2100–7000 PSI |
| Copper Standards | ASTM B280, C12200 |
| Insulation Standards | ASTM E84, UL94, ASTM D1056, ASTM G21 |
| Typical System Range | 4.5–6.0 Ton / 54,000–72,000 BTU depending on equipment requirements |
Installation Tips for Best Results
Measure and Prepare the Line Path First
Plan the distance and routing between indoor and outdoor units before installation. Avoid sharp bends, kinks, and tight routing points that could restrict refrigerant flow or damage insulation.
Protect Insulation at Penetration Points
Use wall sleeves, grommets, or protective conduit where the line set passes through walls. This helps maintain insulation integrity and prevents abrasion.
Secure the Line Set During Installation
Use HVAC-rated clips, straps, or line supports along the run to reduce vibration, prevent sagging, and maintain insulation performance over time.
Pressure Test Before Startup
After connection, pressure testing and leak checking should be performed according to HVAC installation requirements before system startup.
Available Copper 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 |
Copper 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 3/8" x 3/4" Copper Line Set?
Trusted HVAC Quality and Durable Construction
Premium copper materials and certified insulation help ensure consistent refrigerant flow, reduced heat loss, condensation control, and long-lasting HVAC performance.
Professional-Grade Performance for Contractors
This pre-insulated copper line set is built for HVAC technicians, installers, contractors, wholesalers, and distributors who require reliable refrigerant piping for professional installations.
Wide Compatibility for HVAC Projects
Whether used for a new mini split system, ductless heat pump, central HVAC replacement, or split air conditioner installation, this line set provides flexible compatibility when equipment requirements match the line size.
OEM and ODM Customization
Dabund supports custom line set length, copper tube size, insulation thickness, insulation material, logo printing, packaging design, and private label manufacturing for HVAC brands and global buyers.
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 copper line sets, mini split line sets, insulated copper pipes, and HVAC parts face to face.
FAQ About 3/8" x 3/4" Copper Line Set
What is a 3/8" x 3/4" copper line set used for?
It is used as an HVAC refrigerant line set to connect indoor and outdoor units in mini split air conditioners, ductless systems, heat pumps, split AC systems, and central HVAC applications.
What does 3/8" x 3/4" mean?
It refers to the outer diameters of the refrigerant copper tubes. The 3/8" tube is usually the liquid line, and the 3/4" tube is usually the suction line.
What HVAC system size is this copper line set suitable for?
The 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. Final sizing should follow the HVAC equipment manufacturer’s installation manual.
Can this line set handle modern refrigerants?
Yes. This copper line set supports common refrigerants such as R410A, R32, and R22 when the HVAC system specifications and local installation codes are followed.
Do I need extra insulation in the field?
The factory-applied insulation provides effective thermal protection for many installations. In extreme outdoor conditions, additional UV or weatherproof protection may be recommended.
Is this copper line set suitable for outdoor use?
Yes. The insulation is UV-resistant and weather durable, making it suitable for outdoor connections between condenser and evaporator units when properly supported and protected.
Can Dabund customize the line set length or insulation thickness?
Yes. Dabund supports OEM and ODM customization, including custom length, copper tube size, insulation thickness, insulation material, logo printing, and packaging design.
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 copper line sets, mini split line sets, insulated copper pipes, aluminum pipes, and HVAC parts.
Can I get a sample before bulk ordering?
Yes. Dabund can provide free 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.
