3/8" x 7/8" 75 ft Mini Split Line Set

75 Ft 3/8" x 7/8" Mini Split Line Set

DABUND 75 ft 3/8" x 7/8" Mini Split Line Set is a pre-insulated twin copper refrigerant piping solution for compatible ductless mini split air conditioners, heat pumps, split HVAC systems and selected refrigeration applications.

The paired copper tubing includes a 3/8" tube and a 7/8" tube, equivalent to approximately 9.52 mm and 22.23 mm outside diameter. The continuous coil length is 75 ft, approximately 22.86 m.

On compatible HVAC equipment, the 3/8" tube commonly functions as the liquid line while the 7/8" tube functions as the suction or gas line. Exact refrigerant pipe dimensions must always be verified against the equipment manufacturer's installation specifications.

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 75 ft / 22.86 m pre-insulated mini split line set containing 3/8" and 7/8" copper tubing, approximately 9.52 mm and 22.23 mm OD, with black rubber insulation for compatible HVAC installations.

Extended-Line Compatibility Notice: A 75 ft refrigerant run is not suitable for every HVAC system. Confirm pipe dimensions, maximum actual and equivalent piping length, vertical separation, refrigerant type and additional charging requirements for the exact equipment model before installation.

75 Ft 3/8" x 7/8" Line Set Specifications

Key Features of the 3/8" x 7/8" Mini Split Line Set

3/8" Liquid Line and 7/8" Suction Line

On compatible HVAC equipment, the smaller 3/8" copper tube commonly functions as the liquid refrigerant line while the larger 7/8" tube functions as the suction or gas return line.

Their approximate outside diameters are 9.52 mm and 22.23 mm. Because refrigerant piping requirements vary between manufacturers and equipment models, both dimensions should be verified before ordering.

75 Ft Continuous Refrigerant Piping

The 75 ft / 22.86 m continuous coil provides additional routing distance for installations where indoor and outdoor HVAC equipment are positioned farther apart than a standard short line set can accommodate.

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

Paired Copper Tubes for Easier Handling

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

C12200 DHP Copper Tubing

High-purity copper provides good formability, thermal conductivity and corrosion resistance for professional HVAC and refrigeration piping applications.

ASTM B280 and C12200 DHP specifications are available according to the ordered configuration. Buyers requiring a 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.

OEM Printing and Private Label Supply

Company name, pipe dimensions, coil length and other product identification can be printed on the insulation for HVAC distributors, importers and private-label brands.

Single Suction-Line Options

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

High-Purity Copper

Black Rubber Insulation

Protective Plastic Caps

Black Rubber Insulation for HVAC Refrigerant Piping

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

• Closed-cell structure for moisture resistance

• Thermal protection 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 closed-cell structure helps reduce unwanted heat transfer between refrigerant tubing and surrounding air. Correct insulation becomes increasingly important as refrigerant piping length increases.

Condensation Control

Black rubber insulation helps reduce water-vapor penetration and surface condensation. Insulation joints and repaired areas should be properly sealed during installation.

Flexible Routing

Flexible insulation allows the line set to be routed through walls, ceilings, service spaces and mechanical areas while helping protect the copper surface during installation.

UV-Resistant Options

UV-resistant insulation configurations are available for refrigerant piping sections installed outdoors. Additional protective line covers may be required depending on environmental exposure.

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 product being ordered.

Why Choose a 75 Ft Mini Split Line Set?

A 75 ft line set provides additional routing distance for compatible HVAC projects where 25 ft or 50 ft piping is insufficient but a 100 ft coil is not required.

The 22.86 m continuous coil can be useful for installations where indoor and outdoor units are separated by long horizontal runs, multiple rooms, different building levels or structural routing constraints.

Where permitted by the equipment manufacturer, a continuous 75 ft coil can reduce the number of intermediate refrigerant-line connections compared with joining several shorter tubing sections.

Important Requirements for a 75 Ft Refrigerant Run

Verify the Required 3/8" x 7/8" Pipe Sizes

Confirm that the exact HVAC equipment requires approximately 9.52 mm and 22.23 mm outside-diameter refrigerant tubing. Similar-capacity systems can use different pipe dimensions.

Check Maximum Actual Piping Length

Confirm that the equipment manufacturer permits approximately 75 ft / 22.86 m of actual refrigerant piping. Some systems have shorter maximum line-length limits.

Calculate Equivalent Piping Length

Bends and other routing conditions can increase the calculated equivalent line length. Follow the manufacturer's equivalent-length method where applicable.

Confirm Maximum Vertical Separation

Where indoor and outdoor HVAC equipment are installed at different elevations, verify the manufacturer's maximum allowable vertical separation.

Check Additional Refrigerant Charge

Many HVAC systems include a factory refrigerant charge for only a specified standard piping length. A 75 ft installation may require additional refrigerant according to the manufacturer's charging instructions.

Follow Extended-Line Installation Requirements

Some HVAC models specify additional requirements for extended refrigerant piping. These requirements may depend on total line length, vertical lift, refrigerant type and equipment configuration.

Support Long Horizontal and Vertical Runs

Long piping sections should be properly supported to reduce sagging, vibration and mechanical stress on both the copper tubing and insulation.

Protect Insulation at Structural Penetrations

Use suitable sleeves, grommets or other protective materials where the line set passes through walls, floors or structural openings to reduce insulation abrasion and damage.

Is 3/8" x 7/8" Compatible With My HVAC System?

The 3/8" x 7/8" refrigerant line combination is used by selected higher-capacity mini split, heat pump and split-system air conditioners.

Some systems in approximately 72,000–96,000 BTU classes may use these dimensions, but this is not a universal sizing rule. Equipment with similar nominal capacity can require different refrigerant line sizes.

Always verify both pipe diameters against the technical documentation for the exact indoor and outdoor equipment combination before ordering.

Applications of the 75 Ft 3/8" x 7/8" Line Set

Higher-Capacity Split Air Conditioning

Suitable for compatible split-system equipment that specifically requires 3/8" and 7/8" refrigerant piping.

Heat Pump Systems

Can be supplied for compatible heat pump systems requiring these paired refrigerant tube dimensions and an extended piping route.

Commercial HVAC Projects

The 75 ft configuration provides additional routing distance for compatible commercial HVAC installations where indoor and outdoor equipment are positioned farther apart.

Multi-Level HVAC Installations

Extended piping may be useful where refrigerant lines must route between different levels of a building, subject to the equipment manufacturer's maximum vertical separation limits.

Refrigeration Applications

The insulated copper tubing can also be supplied for selected refrigeration applications where pipe size, wall thickness, insulation and operating requirements match the system design.

Available Mini Split Line Set Sizes

75 Ft Mini Split Line Set for HVAC Distributors

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

The 75 ft 3/8" x 7/8" configuration provides an extended-length stocking option for buyers serving compatible higher-capacity HVAC and heat pump installations.

OEM and Custom Mini Split Line Set Supply

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 tubing and related HVAC products to international customers.

Multiple Sizes and Extended Lengths

Multiple copper tube combinations, coil lengths and insulation thicknesses allow distributors to source different refrigerant piping configurations for residential, commercial 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 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 75 ft 3/8" x 7/8" mini split line set?

It is a paired HVAC refrigerant line set containing 3/8" and 7/8" outside-diameter copper tubing with factory-applied insulation. The continuous coil length is approximately 75 ft or 22.86 m.

What are the metric sizes of 3/8" and 7/8" copper tubing?

A 3/8" copper tube has an outside diameter of approximately 9.52 mm, while a 7/8" copper tube has an outside diameter of approximately 22.23 mm.

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

On compatible HVAC equipment, the 3/8" tube commonly serves as the liquid line and the 7/8" tube as the suction or gas line. Always verify the exact equipment piping specification.

What HVAC capacity uses a 3/8" x 7/8" line set?

Some systems in approximately 72,000–96,000 BTU classes may use this tube combination, but this is not universal. Similar-capacity systems can require different refrigerant pipe sizes.

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

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

Why choose a 75 ft mini split line set?

A 75 ft line set provides additional routing distance where a 50 ft line is insufficient while avoiding unnecessary excess tubing where a 100 ft coil is not required.

Can every HVAC system use a 75 ft refrigerant line?

No. Maximum actual and equivalent refrigerant piping lengths vary by manufacturer and model. Confirm that the exact equipment permits a 75 ft / 22.86 m run.

Does a 75 ft line require additional refrigerant?

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

Why does equivalent line length matter?

Bends and other piping conditions can increase equivalent length even when the physical copper tubing length remains unchanged. Extended-line installations should remain within the manufacturer's stated limits.

Why is vertical separation important?

Large elevation differences between indoor and outdoor equipment can affect refrigerant and oil circulation. Follow the equipment manufacturer's maximum vertical-separation specification.

What insulation is used on this line set?

This 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 installed 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 75 ft mini split line set?

Yes. OEM and ODM options include copper tube combinations, coil lengths, insulation thickness, printed 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 75 ft 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.