3/8″ × 7/8″ × 30 ft Copper Line Set – HVAC Refrigerant Line Kit

3/8" x 7/8" x 30 ft Copper Line Set for HVAC Refrigerant Systems

The DABUND 3/8" x 7/8" x 30 ft copper line set is a high-capacity HVAC refrigerant line kit designed for mini split air conditioners, ductless heat pumps, central HVAC systems, and light commercial cooling projects. It includes a 3/8" liquid line and a 7/8" suction line, providing reliable refrigerant transport between indoor and outdoor units.

Made from 99.9% pure copper and protected with factory-applied insulation, this 30 ft HVAC line set helps reduce thermal loss, control condensation, protect refrigerant performance, and support long-term air conditioning system reliability.

Product Overview – HVAC Line Set for Mini Split and AC Systems

This 3/8" x 7/8" x 30 ft copper line set is a twin-tube refrigerant connection solution for HVAC systems. The paired copper tubes are insulated at the factory, helping installers complete refrigerant piping work faster and with more consistent insulation quality.

Standard 3/8" x 7/8" Refrigerant Line Configuration

• 3/8" liquid line for refrigerant delivery

• 7/8" suction line for low-pressure refrigerant return

• 30 ft length for compact to mid-range HVAC installation runs

• Factory-applied insulation for thermal protection and condensation control

• Suitable for higher-capacity mini split, ductless AC, and heat pump systems when specifications match

30 ft Length for Compact to Mid-Range Runs

The 30 ft length is suitable for installations with moderate distance between indoor and outdoor units. It helps reduce the need for extra couplings or extension joints, improving installation efficiency and reducing potential connection points.

• Suitable for single-zone and multi-zone indoor environments

• Useful for residential, apartment, and light commercial HVAC projects

• Helps simplify routing between condenser and evaporator units

Factory-Applied Insulation for Thermal Efficiency and Moisture Protection

High-Performance Thermal Insulation

The insulation is designed to reduce heat gain and heat loss along the copper tubing. Stable insulation helps maintain refrigerant temperature, support system efficiency, and reduce energy waste during cooling or heating operation.

Moisture Control and Condensation Reduction

Pre-insulated copper tubing helps minimize surface condensation, protecting surrounding materials from moisture damage and reducing the risk of mold, corrosion, and insulation degradation.

UV-Resistant Insulation for Outdoor Use

The insulation can meet ASTM E84, UL94, ASTM D1056, and ASTM G21 requirements according to product specification. It is designed for UV resistance, weather durability, and outdoor exposed HVAC line runs.

Premium Copper Construction for HVAC Reliability

99.9% Pure Copper Tubing

The copper tubing is manufactured from 99.9% pure copper and can meet ASTM B280 and C12200 requirements according to product specification. It provides excellent thermal conductivity, corrosion resistance, and long-term durability for refrigerant piping.

Built for High Pressure HVAC Applications

With a pressure rating range of 2100–7000 PSI according to specification, this copper line set can support modern HVAC refrigerants such as R410A and R32 when the pipe size, wall thickness, installation process, and system requirements match.

HVAC Compatibility and Applications

Designed for Mini Split and Ductless AC Systems

The 3/8" x 7/8" copper line set is suitable for connecting indoor evaporators and outdoor condensers in higher-capacity HVAC systems where this line size is specified by the equipment manufacturer.

• Mini split air conditioners

• Ductless heat pump systems

• Central HVAC systems

• Residential HVAC installations

• Light commercial cooling and heating projects

Works with Common HVAC Refrigerants

This HVAC refrigerant line kit can be used with common refrigerants such as R410A and R32 when the copper tube specification, pressure rating, installation distance, and equipment requirements are compatible.

99.9% Pure Copper

White PE Insulated Pipe

Plastic Cap Protection

Pipe Insulation Tubing Features

DABUND insulated copper line sets can use white PE insulation or other insulation options according to customer requirements. The insulation structure helps protect copper refrigerant lines from temperature change, condensation, UV exposure, and external wear.

Thermal Insulation Pipe Production

Insulated Pipe Warehouse

Inner Layer Insulated Pipe

Key Benefits of This 3/8" x 7/8" Line Set

Ready-to-Install Pre-Insulated Tubing

Factory insulation ensures performance consistency and eliminates the need for additional field insulation, helping installers save time and reduce labor costs.

Improves HVAC System Efficiency

Stable refrigerant flow and reduced thermal loss help improve HVAC system performance and support energy-efficient operation.

Durable and Corrosion-Resistant

High-purity copper provides natural corrosion resistance, while durable insulation helps protect the copper tubes from outdoor exposure and long-term wear.

Suitable for HVAC Professionals and OEM Buyers

This line set is suitable for HVAC contractors, mini split system brands, distributors, wholesalers, importers, and project suppliers who need consistent quality and bulk supply.

Technical Specifications

Installation Tips for Best Performance

Plan Line Routing Before Installation

Measure the run distance before installation and choose a smooth routing path. Avoid sharp bends that may restrict refrigerant flow or damage the copper tubing.

Protect Insulation at Wall Penetrations

Use protective sleeves or grommets at wall and floor penetrations to preserve insulation integrity and prevent abrasion.

Support Line Set with Proper Clamps

Install HVAC line supports or brackets along the run to reduce vibration, sagging, and insulation compression over time.

Follow Equipment Manufacturer Requirements

Always confirm line size, maximum line length, elevation limits, refrigerant charge adjustment, evacuation, and pressure testing requirements from the HVAC equipment installation manual.

Copper Line Set Size Options

Line Set Size and HVAC Capacity Reference

Why Choose This 3/8" x 7/8" x 30 ft Line Set?

Trusted Quality and Thermal Performance

Constructed with high-purity copper and robust insulation, this line set delivers dependable refrigerant flow and thermal protection for compatible HVAC systems.

Installation-Ready for HVAC Professionals

Factory insulation and standard sizing streamline installation, helping HVAC technicians, contractors, and experienced installers save time on site.

Suitable for a Wide Range of HVAC Projects

This copper refrigerant line kit can be used for residential homes, apartments, light commercial buildings, heat pump systems, and ductless HVAC projects when the equipment specification requires this line size.

OEM and Bulk Supply Support

DABUND supports custom length, insulation thickness, insulation material, logo printing, private label packaging, and bulk supply for HVAC distributors, importers, wholesalers, and system brands.

DABUND Factory

We produce insulated copper pipe, mini split line set, aluminum pipe, and HVAC parts for global HVAC customers.

SGS Certificate

DABUND mini split line set insulation can be made of polypropylene or black rubber with UV resistance and can meet ASTM E84, UL94, ASTM D1056, and ASTM G21 standards according to product specification.

Exhibition

DABUND joins HVAC exhibitions worldwide to help customers evaluate mini split line sets, copper refrigerant line kits, and HVAC parts face to face.

FAQ

What is a 3/8" x 7/8" x 30 ft copper line set used for?

It is used as an HVAC refrigerant line kit to connect indoor and outdoor units in mini split air conditioners, ductless heat pumps, central HVAC systems, and compatible refrigeration applications.

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

A 3/8" x 7/8" line set is commonly used for higher-capacity HVAC systems, including some 6–8 ton or 72,000–96,000 BTU ductless systems. The exact line size must follow the equipment manufacturer’s installation manual.

Why is factory insulation important for HVAC copper line sets?

Factory insulation helps reduce thermal loss, prevent condensation, protect copper tubing from outdoor exposure, improve installation consistency, and support stable HVAC system performance.

Is this copper line set compatible with R410A and R32 refrigerants?

Yes. It can be used with R410A and R32 systems when the copper tube size, wall thickness, pressure rating, installation distance, and system requirements match the HVAC equipment specification.

Can this 30 ft copper line set be used outdoors?

Yes. The UV-resistant insulation is designed to support outdoor HVAC installation, moisture protection, condensation control, and long-term durability according to selected specification.

What standards can this HVAC refrigerant line kit meet?

The copper tube and insulation can meet ASTM B280, C12200, ASTM E84, UL94, ASTM D1056, and related HVAC material standards according to product specification.

Can DABUND customize the copper line set?

Yes. DABUND supports OEM and ODM customization, including pipe size, length, insulation material, insulation thickness, logo printing, private label packaging, and bulk production.

What are your payment terms?

Payment terms can include TT, L/C at sight, credit card, and other agreed payment methods depending on order details and customer requirements.

What are your delivery terms?

Delivery terms can include EXW, FOB, CFR, CIF, and other international trade terms according to buyer logistics requirements.

Are you a trading company or manufacturer?

DABUND is a manufacturer of insulated copper pipe, mini split line sets, aluminum pipe, and HVAC parts.

Can I get a sample before bulk order?

Yes. DABUND can send 3 pieces of free samples. The buyer only needs to cover the express cost.

How long is your delivery time?

Normal delivery time is usually 15–20 days. For urgent orders, DABUND can arrange production and delivery in advance when capacity allows.