50 ft Mini Split Line Set 3/8 5/8

50 Ft 3/8" x 5/8" Mini Split Line Set

DABUND 50 ft 3/8" x 5/8" Mini Split Line Set is a pre-insulated twin copper refrigerant piping solution for compatible ductless mini split air conditioners, heat pumps and split HVAC systems.

The paired copper tubing includes a 3/8" tube and a 5/8" tube, equivalent to approximately 9.52 mm and 15.88 mm outside diameter. The continuous coil length is 50 ft, approximately 15.24 m.

On compatible HVAC equipment, the 3/8" tube commonly functions as the liquid line while the 5/8" tube functions as the suction or gas line. Exact refrigerant pipe dimensions 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 black rubber insulation for 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 3/8" and 5/8" copper tubing, approximately 9.52 mm and 15.88 mm OD, with black rubber insulation for compatible HVAC systems.

Compatibility Notice: Do not select this line set only by BTU capacity, tonnage or brand. Confirm the required liquid-line diameter, suction-line diameter, maximum piping length, vertical separation, refrigerant type and charging requirements for the exact equipment model.

50 Ft 3/8" x 5/8" Line Set Specifications

Key Features of the 3/8" x 5/8" Mini Split Line Set

3/8" Liquid Line and 5/8" Suction Line

On compatible mini split and heat pump systems, the smaller 3/8" copper tube commonly serves as the liquid refrigerant line while the larger 5/8" tube serves as the suction or gas return line.

Their approximate outside diameters are 9.52 mm and 15.88 mm. Because refrigerant piping requirements vary between equipment models, both dimensions should be confirmed before ordering or installation.

50 Ft Continuous Refrigerant Piping

The 50 ft / 15.24 m continuous coil provides additional routing flexibility for installations where the indoor unit and outdoor condenser or heat pump are positioned farther apart.

Where permitted by the equipment manufacturer, one continuous copper coil can reduce intermediate refrigerant-line joints compared with connecting multiple shorter tubing sections.

Paired and Secured Copper Tubes

The two insulated copper tubes can be supplied together as a paired line set and secured for organized transport and installation. This helps distributors and contractors handle the two refrigerant lines as one packaged unit.

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 configuration. Buyers requiring specific tube wall thickness or pressure performance should confirm the applicable technical data before production.

Factory-Applied Black Rubber Insulation

Factory-applied black rubber insulation helps reduce field preparation while providing thermal protection and helping control condensation around the refrigerant copper tubing.

Multiple Insulation Thickness Options

Available black rubber insulation thicknesses include 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm according to the selected product configuration and project requirements.

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, wholesalers and private-label brands.

Single Suction-Line Supply Options

Selected single insulated suction-line configurations can also be discussed for replacement, OEM and project requirements. Required tube size, insulation and length should be confirmed before ordering.

High-Purity Copper

Black Rubber Insulation

Protective Plastic Caps

Black Rubber Insulation for Mini Split Line Sets

Closed-cell black rubber insulation helps reduce unwanted heat transfer and moisture penetration while supporting condensation control around refrigerant copper tubing.

• Closed-cell structure for moisture resistance

• Thermal insulation for refrigerant piping

• Helps reduce surface condensation

• Flexible construction for easier routing

• UV-resistant configurations available

• Multiple insulation thickness options

• Selected configurations with temperature ranges from approximately -40°C to 120°C

Thermal Protection

The high-density closed-cell structure helps reduce heat transfer between the refrigerant tubing and surrounding air.

Condensation Control

Black rubber insulation helps limit water-vapor penetration and surface condensation. Insulation joints should be properly sealed, particularly in warm and humid installation environments.

Flexible Routing

Flexible insulation allows the paired copper tubing to be routed through walls, ceilings, attics and service spaces while helping protect the tubing during normal installation handling.

Outdoor Protection

UV-resistant insulation configurations are available for refrigerant-line sections installed outdoors. Additional protective line-set covers may be used where greater mechanical or weather protection is required.

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 documentation for the exact insulation being ordered.

Why Choose a 50 Ft 3/8" x 5/8" Line Set?

A 50 ft mini split line set provides additional routing flexibility where indoor and outdoor HVAC equipment are separated by walls, ceilings, floors or longer horizontal distances.

The 15.24 m continuous coil can help reduce intermediate piping joints compared with connecting several shorter copper sections when the equipment manufacturer permits the required refrigerant-line length.

This length can be useful for residential and light-commercial installations where outdoor equipment cannot be positioned close to the indoor unit.

Installation Considerations for a 50 Ft Refrigerant Line

Verify the Required 3/8" x 5/8" Pipe Sizes

Confirm that the exact equipment requires approximately 9.52 mm and 15.88 mm outside-diameter refrigerant tubing. Similar-capacity HVAC systems can use different pipe dimensions.

Check Maximum Actual Line Length

Confirm that the equipment manufacturer permits approximately 50 ft / 15.24 m of actual refrigerant piping. Maximum line length varies between equipment models.

Check Equivalent Piping Length

Bends and routing conditions may affect equivalent piping length. Follow the equipment manufacturer's calculation method where an equivalent-length limit is specified.

Confirm Maximum Vertical Separation

If indoor and outdoor equipment are installed at different elevations, verify the maximum permitted vertical separation for the exact HVAC model.

Check Additional Refrigerant Requirements

Some HVAC systems include a factory refrigerant charge for only a specified standard piping length. A 50 ft installation may require additional refrigerant according to the manufacturer's charging instructions.

Support and Protect the Line Set

Long horizontal and vertical sections should be properly supported to reduce sagging, vibration and mechanical stress. Protect the insulation at wall, floor and structural penetrations.

Is 3/8" x 5/8" Compatible With My Mini Split?

The 3/8" x 5/8" refrigerant line combination is used by selected mini split, heat pump and split-system air conditioners.

Some equipment in approximately 36,000–48,000 BTU classes may use these dimensions, but this is not a universal sizing rule. Systems with similar nominal capacity can require different refrigerant pipe sizes.

Always verify the liquid-line and suction-line dimensions specified for the exact indoor and outdoor equipment combination before purchasing the line set.

Applications of the 3/8" x 5/8" Mini Split Line Set

Ductless Mini Split Air Conditioners

Suitable for compatible ductless mini split systems that specifically require 3/8" and 5/8" refrigerant tubing.

Heat Pump Systems

Can be supplied for compatible heat pump systems requiring these paired refrigerant pipe dimensions and suitable insulation.

Residential HVAC Installations

The 50 ft coil provides additional routing distance for compatible residential installations where indoor and outdoor equipment are positioned farther apart.

Light-Commercial HVAC Projects

Suitable for compatible light-commercial HVAC projects where the required copper tube dimensions, piping distance and insulation specification match this line-set configuration.

Available Mini Split Line Set Sizes

50 Ft Mini Split Line Set for HVAC Distributors

DABUND supplies pre-insulated mini split line sets to HVAC distributors, wholesalers, importers, contractors, engineering companies and private-label brands.

The 50 ft 3/8" x 5/8" configuration provides a stocking option for buyers serving compatible mini split, heat pump and split HVAC installations.

OEM and Custom Mini Split Line Sets

DABUND supports OEM and ODM supply for HVAC distributors, importers and private-label brands.

• Custom copper tube combinations

• Custom coil lengths

• Multiple black rubber insulation thicknesses

• Selected single suction-line options

• Company name and specification printing

• Private-label packaging

• Custom product identification

• Bulk supply for distributors and project buyers

Why Choose DABUND Mini Split Line Sets?

HVAC Manufacturing Experience Since 2008

DABUND has manufactured HVAC components since 2008, supplying mini split line sets, insulated copper pipe and related HVAC products to international customers.

Multiple Sizes, Lengths and Insulation Options

Multiple copper tube combinations, coil lengths and insulation thicknesses allow distributors to source different HVAC refrigerant piping configurations according to market and project requirements.

OEM and Private-Label Support

Insulation printing, product identification and packaging can be customized for HVAC brands, wholesalers and distributors.

DABUND Factory and Export Packaging

DABUND manufactures and packages insulated copper line sets 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 product configuration being ordered.

International HVAC Exhibitions

DABUND participates in international HVAC exhibitions to present mini split line sets, insulated copper tubing and related HVAC products to distributors, importers and professional buyers.

Frequently Asked Questions

What is a 50 ft 3/8" x 5/8" mini split line set?

It is a paired HVAC refrigerant line set containing 3/8" and 5/8" outside-diameter copper tubing with factory-applied insulation. The coil length is approximately 50 ft or 15.24 m.

What are the metric sizes of 3/8" and 5/8" copper tubing?

A 3/8" copper tube has an outside diameter of approximately 9.52 mm, while a 5/8" copper tube has an outside diameter of approximately 15.88 mm.

Which tube is the liquid line and which is the suction line?

On compatible systems, the 3/8" tube commonly serves as the liquid line and the 5/8" tube as the suction or gas line. Always verify the piping specification for the exact equipment model.

What HVAC capacity uses a 3/8" x 5/8" line set?

Some systems in approximately 36,000–48,000 BTU classes may use this line combination, but it is not universal. Similar-capacity equipment can require different refrigerant pipe dimensions.

Can I choose the line set by BTU or tonnage alone?

No. Refrigerant pipe sizing depends on equipment design, refrigerant type, piping length, vertical separation and manufacturer specifications.

Why choose a 50 ft mini split line set?

A 50 ft line set provides additional routing distance where shorter copper lines are insufficient and may reduce intermediate piping connections when the equipment permits a continuous 50 ft run.

Can every mini split use a 50 ft line set?

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 line require additional refrigerant?

It may. Many HVAC systems include a factory refrigerant charge for only a specified standard line length. Follow the equipment manufacturer's charging instructions for the exact model.

What insulation is used on this line set?

This product configuration uses black rubber closed-cell insulation designed to provide thermal protection and help control condensation around refrigerant piping.

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 configuration.

Is UV-resistant insulation available?

Yes. UV-resistant insulation configurations are available where sections of the refrigerant piping are exposed outdoors.

Can DABUND supply only an insulated suction line?

Selected single insulated suction-line configurations can be discussed for replacement, OEM and project requirements. Confirm tube diameter, insulation and length before ordering.

What pressure rating does the copper tubing have?

Allowable working and test pressure depends on copper tube diameter, wall thickness, material specification and ordered configuration. Buyers requiring a specific pressure rating should confirm the applicable technical data before ordering.

Can DABUND customize the 50 ft line set?

Yes. OEM and ODM options include copper tube combinations, coil lengths, insulation thickness, insulation 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 order quantity, product specification, customization and production schedule.

Who should install a mini split 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.