-
DBJ-003
-
DABUND
-
Copper
-
1M - 50M
Material
Color
Keywords
Application
50 Ft 1/4" x 3/8" Mini Split AC Line Set
DABUND 50 ft 1/4" x 3/8" Mini Split AC Line Set is a pre-insulated twin copper refrigerant line designed for compatible ductless mini split air conditioners, heat pumps and split HVAC systems.
The paired copper tubing includes a 1/4" tube and a 3/8" tube, equivalent to approximately 6.35 mm and 9.52 mm outside diameter. The continuous coil length is 50 ft, approximately 15.24 m.
On compatible mini split systems, the 1/4" tube commonly functions as the liquid line while the 3/8" tube functions as the suction or gas line. Exact refrigerant line sizes must always be verified against the installation manual for the specific indoor and outdoor equipment combination.
High-purity copper tubing is combined with factory-applied white PE insulation to provide thermal protection and condensation control. ASTM B280 and C12200 DHP copper specifications are available according to the ordered configuration.
Quick Answer: This product is a 50 ft / 15.24 m pre-insulated mini split line set containing 1/4" and 3/8" copper tubing, approximately 6.35 mm and 9.52 mm OD, with white PE insulation for compatible HVAC installations.
Compatibility Notice: Do not select a mini split line set only by BTU capacity, tonnage or brand. Confirm the liquid-line diameter, suction-line diameter, maximum piping length, vertical separation, refrigerant type and charging requirements for the exact equipment model.
50 Ft Mini Split Line Set Specifications
| Brand | DABUND |
| Product Type | Pre-Insulated Mini Split AC Line Set |
| Copper Tube Size | 1/4" + 3/8" |
| Metric Outside Diameter | Approx. 6.35 mm + 9.52 mm |
| Common Line Function | 1/4" liquid line + 3/8" suction/gas line on compatible equipment |
| Length | 50 ft / approx. 15.24 m |
| Copper Material | High-purity copper / C12200 DHP according to specification |
| Copper Standard | ASTM B280 specification available |
| Insulation | White PE closed-cell insulation |
| Insulation Thickness Options | 8 mm / 9 mm / 10 mm / 13 mm / 19 mm / 25.4 mm |
| Selected Temperature Range | Approx. -40°C to 120°C depending on insulation specification |
| Applications | Compatible mini split AC, heat pump and split HVAC systems |
| OEM / ODM | Lengths, insulation, printing, branding and packaging customization |
Key Features of the 1/4" x 3/8" Mini Split Line Set
1/4" Liquid Line and 3/8" Suction Line
On compatible mini split equipment, the smaller 1/4" copper tube commonly serves as the liquid refrigerant line while the larger 3/8" tube serves as the suction or gas return line.
Their approximate outside diameters are 6.35 mm and 9.52 mm. Because different mini split models can specify different refrigerant line dimensions, both sizes should be confirmed before purchase or installation.
50 Ft Continuous Copper Line Set
The 50 ft / 15.24 m continuous coil provides additional routing flexibility when the indoor evaporator and outdoor condenser or heat pump are positioned farther apart.
Where permitted by the equipment manufacturer, one continuous coil can reduce intermediate refrigerant piping connections compared with joining multiple shorter copper sections.
C12200 DHP Copper for HVAC Applications
High-purity copper provides good formability, thermal conductivity and corrosion resistance for professional air-conditioning and refrigeration piping applications.
ASTM B280 and C12200 DHP specifications are available according to the ordered product configuration. Buyers requiring specific tube wall thickness or pressure performance should confirm the applicable technical data before production.
Factory-Applied White PE Insulation
Factory-applied white PE insulation helps reduce field preparation while providing thermal protection and helping control condensation around the refrigerant tubing.
Multiple Insulation Thickness Options
Multiple insulation thickness options are available for different climates, project requirements and distributor specifications.
OEM Printing and Private Label Supply
Company name, copper tube dimensions, coil length and other product identification can be printed on the insulation for HVAC distributors, importers and private-label brands.
Single Suction-Line Supply Options
In addition to paired line-set configurations, single insulated suction-line supply can be discussed for specific OEM or replacement requirements. Tube size, insulation and length should be confirmed before ordering.
High-Purity Copper
White PE Insulation
Protective Plastic Caps
White PE Multi-Layer Insulation
The white PE insulation system uses a multilayer structure designed to help reduce heat transfer, moisture penetration and normal mechanical damage during handling and HVAC installation.
Embossed PE Outer Layer
The embossed PE outer layer helps protect the insulation from abrasion and handling damage. UV-resistant configurations are available for refrigerant piping that includes outdoor sections.
IXPE Foam Middle Layer
The foam middle layer helps reduce heat transfer while providing cushioning and moisture resistance around the copper refrigerant tube.
Closed-Cell Inner Layer
The closed-cell inner structure helps limit water-vapor penetration and supports condensation control around cold refrigerant piping.
Insulation Pipe Production
Insulated Pipe Warehouse
Closed-Cell Inner Insulation
Insulation Performance for Mini Split Systems
Thermal Protection
Suitable insulation helps reduce unwanted heat transfer between refrigerant tubing and the surrounding air, supporting stable operating conditions when the HVAC system is correctly designed and installed.
Condensation Control
Closed-cell insulation helps reduce water-vapor penetration and surface condensation. Insulation joints should be properly sealed, particularly in warm and humid environments.
Flexible Installation
Pre-insulated tubing reduces field preparation and makes it easier to route the refrigerant line through walls, ceilings, attics and service spaces.
Outdoor Protection
UV-resistant insulation configurations are available for outdoor refrigerant-line sections. Additional line-set covers or mechanical protection may be required depending on climate and installation conditions.
Insulation Testing Options
Available insulation specifications include testing related to ASTM E84, UL 94, ASTM D1056, ASTM G21, ASTM C1427 and UL 723 according to the selected material configuration. Buyers should confirm the applicable test documentation for the exact product being ordered.
Why Choose a 50 Ft Mini Split AC Line Set?
A 50 ft line set provides more routing flexibility than common short line sets when the indoor air handler and outdoor condenser are positioned farther apart.
Typical routing can pass through walls, ceilings, attics and other building spaces before reaching the outdoor unit.
Where the equipment manufacturer permits the required piping length, a continuous 50 ft coil can reduce intermediate refrigerant-line joints compared with connecting several shorter copper sections.
Installation Considerations for a 50 Ft Mini Split Line
Verify the Required Refrigerant Pipe Sizes
Confirm that the exact mini split model requires 1/4" and 3/8" outside-diameter tubing. Systems with similar nominal cooling capacity may use different refrigerant pipe dimensions.
Check Maximum Actual Line Length
Confirm that the equipment manufacturer permits approximately 50 ft / 15.24 m of actual refrigerant piping. Do not assume every mini split system supports the same maximum line length.
Check Equivalent Piping Length
Bends and routing conditions may affect equivalent piping length. Follow the equipment manufacturer's calculation method where equivalent-length limits are specified.
Confirm Vertical Separation
When indoor and outdoor units are installed at different elevations, verify the manufacturer's maximum permitted vertical separation.
Check Additional Refrigerant Requirements
Some mini split systems include a factory refrigerant charge for only a specified standard piping length. A 50 ft installation may require additional refrigerant according to the equipment manufacturer's charging instructions.
Support and Protect the Line Set
Long horizontal and vertical piping sections should be properly supported to reduce sagging, vibration and mechanical stress. Protect the insulation where the line set passes through walls or other structural openings.
Is 1/4" x 3/8" Compatible With My Mini Split?
The 1/4" x 3/8" combination is commonly used on selected smaller-capacity ductless mini split systems. Some equipment around 9,000–12,000 BTU may specify these dimensions.
However, BTU capacity or tonnage alone should not be used to determine refrigerant pipe size. Different models with similar nominal capacity can require different line-set dimensions.
Always use the manufacturer's technical documentation for the exact indoor and outdoor equipment combination as the final reference.
Applications of the 1/4" x 3/8" Mini Split Line Set
Ductless Mini Split Air Conditioners
Designed for compatible ductless mini split air conditioners that specifically require 1/4" liquid and 3/8" suction-line dimensions.
Mini Split Heat Pumps
Suitable for compatible ductless heat pump systems using this paired refrigerant pipe combination.
Residential AC Installation
The 50 ft coil provides additional routing flexibility for residential installations where indoor and outdoor units are separated by walls, floors or longer horizontal distances.
Light-Commercial HVAC Projects
Can be used in compatible light-commercial applications where the specified refrigerant piping dimensions and allowable line length match this configuration.
Available Mini Split Line Set Sizes
| Size | Available Length | White PE Insulation | Flame-Resistant Options |
| 1/4 + 3/8 | Current SKU: 50 ft / 15.24 m; 15m / 20m / 25m / 30m / 50m options | 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 Sets for HVAC Distributors
DABUND supplies pre-insulated mini split AC line sets to HVAC distributors, wholesalers, importers, contractors, project suppliers and private-label brands.
The 50 ft 1/4" x 3/8" configuration provides a stocking option for buyers serving compatible ductless mini split and heat pump installations.
OEM and Custom Mini Split Line Set Supply
DABUND supports OEM and ODM production for HVAC distributors, importers and private-label brands.
Custom copper tube combinations
Custom coil lengths
Multiple white PE insulation thicknesses
Single suction-line options according to requirement
Logo and specification printing
Private-label packaging
Custom product identification
Bulk production for distributors and project buyers
Why Choose DABUND Mini Split AC Line Sets?
HVAC Manufacturing Experience Since 2008
DABUND has manufactured HVAC components since 2008, supplying mini split line sets, insulated copper tubing and related HVAC products to international customers.
Multiple Line Set Sizes and Lengths
Multiple copper tube combinations, coil lengths and insulation thicknesses allow distributors to source different mini split line-set configurations according to market requirements.
OEM and Private-Label Support
Insulation printing, product identification and packaging can be customized for HVAC brands, wholesalers and distributors.
DABUND Factory
DABUND manufactures insulated copper pipe, mini split line sets, aluminum pipe and related HVAC components for international B2B customers.
SGS Testing and Insulation Standards
Available insulation configurations include testing related to ASTM E84, UL 94, ASTM D1056 and ASTM G21 according to the selected material specification. Buyers should confirm the applicable documentation for the exact insulation configuration being ordered.
International HVAC Exhibitions
DABUND participates in international HVAC exhibitions to present mini split line sets, insulated copper tubing and related products to distributors, importers and professional buyers.
Frequently Asked Questions
What is a 50 ft 1/4" x 3/8" mini split line set?
It is a paired refrigerant copper line set containing 1/4" and 3/8" outside-diameter tubing with factory-applied insulation. The coil length is approximately 50 ft or 15.24 m.
What are the metric sizes of 1/4" and 3/8" copper tubing?
A 1/4" copper tube has an outside diameter of approximately 6.35 mm, while a 3/8" copper tube has an outside diameter of approximately 9.52 mm.
Which tube is the liquid line and which is the suction line?
On compatible mini split equipment, the 1/4" tube commonly functions as the liquid line and the 3/8" tube as the suction or gas line. Always confirm this with the exact equipment documentation.
What mini split capacity uses a 1/4" x 3/8" line set?
Some mini split systems around 9,000–12,000 BTU may use this pipe combination, but it is not universal. Systems with similar nominal capacity can require different refrigerant line dimensions.
Can I select a mini split line set by BTU alone?
No. Refrigerant pipe sizing depends on equipment design, refrigerant type, line length, vertical separation and manufacturer requirements. Always verify the exact model.
Why choose a 50 ft mini split line set?
A 50 ft coil provides additional routing distance where shorter line sets are insufficient and may reduce intermediate piping connections when the equipment permits a continuous 50 ft refrigerant run.
Can every mini split use a 50 ft refrigerant line?
No. Maximum actual and equivalent refrigerant piping lengths vary by equipment model. Check the manufacturer's installation documentation before using a 50 ft line set.
Does a 50 ft mini split line require additional refrigerant?
It may. Many mini split systems include a factory refrigerant charge for only a specified standard line length. Follow the manufacturer's charging instructions for the exact equipment model.
What insulation does this mini split line set use?
This configuration uses white PE closed-cell insulation designed to provide thermal protection and help control condensation around refrigerant tubing.
What insulation thicknesses are available?
Available insulation thickness options include 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm depending on the selected product configuration.
Is UV-resistant insulation available?
Yes. UV-resistant insulation configurations are available where parts of the refrigerant line are installed outdoors.
Can DABUND supply only an insulated suction line?
Single insulated suction-line configurations can be discussed for specific OEM, replacement or project requirements. Confirm the required copper diameter, insulation and coil length before ordering.
What pressure rating does the copper tubing have?
Allowable working and test pressure depends on tube diameter, wall thickness, copper specification and ordered configuration. Buyers requiring a specific pressure value should confirm the applicable technical data before ordering.
Can DABUND customize the mini split AC line set?
Yes. OEM and ODM options include copper tube combinations, coil lengths, insulation thickness, logo printing, product identification and private-label packaging.
Can I get samples before placing a bulk order?
Yes. According to the current product information, DABUND can provide three sample pieces for evaluation, with the buyer covering express shipping costs. View sample information.
What payment terms are available?
Available payment methods can include T/T, L/C at sight and credit card. Final payment terms depend on the commercial agreement.
What delivery terms are available?
International trade terms can include EXW, FOB, CFR and CIF according to the buyer's logistics requirements.
What is the typical delivery time?
Current product information lists typical delivery at approximately 15–20 days. Actual lead time depends on quantity, specification, customization and production schedule.
Who should install a mini split refrigerant line set?
Refrigerant piping, flare or brazed connections, pressure testing, evacuation and refrigerant charging should be completed by qualified HVAC personnel according to local requirements and the equipment manufacturer's instructions.
