50 ft 1/4″ × 1/2″ Mini Split Air Conditioner Kit – Complete HVAC Line Set

50 ft 1/4" x 1/2" Mini Split AC Installation Kit

The DABUND 50 ft 1/4" x 1/2" mini split air conditioner installation kit is a complete HVAC installation package for compatible ductless mini split air conditioners, heat pumps, and split AC systems. It combines a 50 ft pre-insulated copper refrigerant line set with communication cable, condensate drain hose, wall pipe, protective cover, pre-flared copper ends, flare nuts, and selected installation accessories.

The refrigerant line set consists of a 1/4" (6.35 mm) liquid line and a 1/2" (12.70 mm) suction line. The 50 ft length provides additional routing flexibility where indoor and outdoor HVAC units are positioned farther apart, while factory-applied insulation helps reduce unwanted heat transfer and condensation.

DABUND uses 99.9% pure copper and can supply HVAC tubing according to ASTM B280 requirements using C12200 copper according to the ordered specification. OEM and ODM options are available for HVAC distributors, wholesalers, importers, contractors, project suppliers, and private-label air conditioning brands.

What Is Included in the 50 ft Mini Split Installation Kit?

This complete mini split installation kit combines the main refrigerant piping and commonly required HVAC installation accessories in one package. For distributors and contractors, a complete kit simplifies sourcing and provides a more convenient installation solution than purchasing each component separately.

• 50 ft 1/4" x 1/2" pre-insulated copper line set

• Pre-flared copper tube ends

• Matching flare nuts

• Communication wiring cable

• Approximately 3 m condensate drain hose

• Wall penetration pipe

• Protective or decorative wall cover

• Additional installation accessories according to the selected kit configuration

50 ft Pre-Insulated Copper Line Set

The paired refrigerant tubing measures approximately 50 ft (15.24 m). The longer coil is useful for installations where the indoor evaporator and outdoor condenser or heat pump require a substantial routing distance.

Pre-Flared Ends and Flare Nuts

Both copper tubes can be supplied with factory-prepared flare ends and matching nuts. When the flare specification matches the HVAC equipment, this reduces field tube preparation and helps professional installers complete connections more efficiently.

Communication Cable

The kit includes communication wiring for compatible indoor and outdoor mini split units. Electrical conductor size, number of conductors, voltage rating, and local electrical requirements should always be matched to the selected HVAC equipment.

Drain Hose, Wall Pipe and Cover

The condensate drain hose helps remove water generated by the indoor evaporator during cooling operation, while the wall pipe and cover protect the installation where refrigerant piping passes through a wall.

1/4" x 1/2" Refrigerant Line Set Explained

1/4" Liquid Line

The smaller copper tube has an outside diameter of 1/4" or approximately 6.35 mm. In compatible HVAC systems, this tube is commonly used as the liquid refrigerant line.

1/2" Suction Line

The larger copper tube has an outside diameter of 1/2" or approximately 12.70 mm. It is commonly used as the suction or vapor refrigerant line when specified by the equipment manufacturer.

Why Are Two Different Copper Tube Sizes Used?

Liquid refrigerant and refrigerant vapor have different flow characteristics. Correct liquid-line and suction-line diameters help manage refrigerant velocity, pressure drop, system performance, and oil return. For this reason, line size should always match the exact HVAC equipment specification.

50 ft 1/4" x 1/2" Mini Split Kit Technical Specifications

99.9% Pure Copper for HVAC Refrigerant Piping

DABUND uses high-purity copper for HVAC refrigerant piping. Copper is widely used in air conditioning and refrigeration because it combines thermal conductivity, corrosion resistance, workability, and pressure performance.

ASTM B280 Copper Tubing

Copper tubing can be supplied according to ASTM B280 requirements for seamless copper tubing used in air conditioning and refrigeration applications.

C12200 Copper

C12200 copper can be supplied according to the ordered tubing specification, providing the combination of formability, thermal performance, and corrosion resistance required for HVAC refrigerant piping.

Factory-Applied Black Rubber Insulation

The black rubber insulation option uses a flexible closed-cell structure designed for HVAC refrigerant piping. Factory insulation helps provide more consistent coverage while reducing insulation work during installation.

Condensation Control

The closed-cell insulation structure helps reduce contact between cold refrigerant tubing and warm humid air, limiting surface condensation and helping protect nearby walls, ceilings, and building materials.

Thermal Protection

Correctly specified insulation helps reduce unwanted heat transfer between the refrigerant piping and ambient air, supporting stable HVAC operating conditions.

Moisture Resistance

The insulation material acts as both a thermal barrier and a moisture-resistant layer, helping reduce water-vapor penetration when correctly installed and sealed.

Operating Temperature

Selected black rubber insulation materials are available for operating temperatures of approximately -40°C to 120°C. Buyers should confirm the exact material specification required for their application.

99.9% Pure Copper

Black Rubber Insulated Pipe

Factory Flaring

Black Rubber Pipe Insulation Features

• Temperature range: approximately -40°C to 120°C according to material specification

• Closed-cell structure: designed to reduce moisture penetration

• Condensation control: helps limit surface sweating on cold refrigerant piping

• Thermal insulation: helps reduce unwanted heat transfer

• Flexible construction: suitable for routing around normal HVAC installation bends

White PE and Black Rubber Insulation Options

White PE Insulation

White PE insulation is available in multiple thicknesses including approximately 8 mm, 9 mm, 10 mm, 13 mm, 19 mm, and 25.4 mm. The appropriate thickness depends on project conditions, climate, condensation-control requirements, and customer specifications.

Black Rubber Insulation

Black rubber insulation is available in thicknesses including approximately 13 mm, 17 mm, 19 mm, and 25.4 mm, depending on the ordered product configuration.

Insulation Test Documentation

Depending on the selected insulation material and specification, DABUND test documentation can reference ASTM E84, UL 94, ASTM D1056, and ASTM G21. Buyers requiring compliance documentation should confirm the applicable insulation configuration and corresponding test report before ordering.

Why Choose a 50 ft Mini Split Installation Kit?

A 50 ft installation kit is designed for projects where the indoor and outdoor HVAC units require considerably more routing distance than standard short installation kits.

Longer Installation Flexibility

The 50 ft coil can be useful where the outdoor condenser is installed around a building corner, on a roof, at another floor level, or farther from the indoor air handler.

Complete HVAC Accessory Package

Combining refrigerant piping, communication wiring, drainage components, wall protection, and connections in one kit reduces separate sourcing requirements for HVAC installers and distributors.

Factory-Insulated Tubing

Pre-insulated copper tubing reduces field insulation work and provides more consistent insulation coverage throughout the supplied line.

Pre-Flared Connections

Factory-prepared flare ends can reduce preparation work for professional installers when the connections match the equipment specification.

Is 1/4" x 1/2" the Correct Line Set Size?

A 1/4" liquid line and 1/2" suction line are commonly specified for certain small-to-medium ductless mini split and heat pump systems. However, pipe size cannot be selected reliably from BTU capacity or tonnage alone.

Different brands can require different refrigerant tube diameters for systems with similar nominal capacities. The HVAC equipment manufacturer's installation manual should always determine final line-set selection.

Check These Specifications Before Ordering

• Required liquid-line diameter

• Required suction-line diameter

• Refrigerant type

• Minimum and maximum refrigerant piping length

• Maximum permitted vertical elevation difference

• Required insulation thickness

• Communication cable specification

• Additional refrigerant charge requirements

Can a Mini Split Use the Full 50 ft Line Set?

Not every mini split system permits a 50 ft refrigerant run. HVAC manufacturers specify maximum piping length and maximum elevation difference for each system. Always verify both limits before installation.

Check Additional Refrigerant Requirements

Many mini split systems contain a factory refrigerant charge for a specified standard piping length. If the installed line is longer, additional refrigerant may be required according to the manufacturer's charge-per-foot or charge-per-meter specification.

Check Vertical Elevation Limits

For multi-story installations, rooftop condensers, or outdoor units positioned significantly above or below the indoor unit, confirm the maximum permitted elevation difference as well as the total piping length.

R410A and R32 HVAC Applications

DABUND copper line sets can be supplied for HVAC systems using refrigerants such as R410A and R32 when copper diameter, wall thickness, pressure rating, cleanliness, connection method, equipment requirements, and applicable codes are correctly matched.

Refrigerant compatibility should not be determined solely from the 1/4" x 1/2" pipe dimensions. Always follow the specifications of the exact mini split or heat pump model.

Applications for the 50 ft Mini Split Air Conditioner Kit

• Ductless mini split air conditioners

• Mini split heat pumps

• Residential HVAC projects

• Apartment and condominium installations

• Small office HVAC systems

• Light commercial installations

• Longer indoor-to-outdoor HVAC runs

• Replacement and retrofit installations

Professional Installation Guidelines

Measure the Complete Routing Path

Measure the actual piping route before installation, including wall penetrations, bends, elevation changes, final connection positions, and any service loop required by the equipment manufacturer.

Avoid Sharp Bends and Kinks

Use appropriate HVAC copper tube-bending methods and maintain a suitable bend radius. Kinked or excessively flattened tubing can restrict refrigerant flow and should not be installed.

Protect the Insulation

Avoid cutting, tearing, crushing, or excessively compressing the insulation. Use the supplied wall pipe, protective cover, or suitable line-set protection at penetrations and exposed locations.

Support Long Line-Set Runs

Use HVAC-rated clamps, brackets, straps, or line-set channels along long piping routes to reduce sagging and vibration while protecting the insulation.

Use the Correct Flare-Nut Torque

Tighten flare nuts according to the HVAC manufacturer's torque specification. Under-tightening may contribute to leakage, while excessive torque can damage the flare connection.

Maintain Correct Drain Hose Slope

The condensate drain hose should maintain the downward slope specified by the indoor-unit manufacturer so water drains correctly. This slope requirement applies to the condensate drain hose, not the refrigerant suction line.

Leak Test and Evacuate Before Startup

After completing refrigerant piping connections, follow the equipment manufacturer's procedures for leak testing, pressure testing where applicable, vacuum evacuation, refrigerant adjustment, valve operation, and system commissioning.

Available Mini Split Air Conditioner Kit Sizes

DABUND manufactures mini split installation kits in multiple copper tube combinations, lengths, insulation thicknesses, and flame-resistant configurations for different HVAC markets and equipment requirements.

Mini Split Line Set Size Selection Guide

Different HVAC systems require different liquid-line and suction-line dimensions. The following table is a general purchasing reference only and does not replace the equipment manufacturer's piping specifications.

Important: Do not choose an HVAC installation kit solely from BTU, tonnage, or horsepower. Always confirm the required liquid-line and suction-line diameters in the installation manual for the exact HVAC model.

OEM & ODM Mini Split Installation Kit Supplier

DABUND supplies mini split air conditioner installation kits to HVAC distributors, wholesalers, importers, contractors, project suppliers, and private-label HVAC brands.

Custom Kit Lengths

Common mini split kit lengths include 3 m, 4 m, 5 m, 6 m, 7 m, 8 m, and 10 m. Additional configurations can be discussed according to customer requirements and order quantity.

Custom Copper Line Sizes

Different liquid-line and suction-line combinations can be supplied according to the requirements of HVAC equipment in different target markets.

Custom Insulation

White PE and black rubber insulation options are available in multiple thicknesses for different climates, customer specifications, condensation-control requirements, and market standards.

Custom Kit Accessories

B2B buyers can discuss customized communication cables, drain hoses, wall sleeves, covers, fittings, and other components according to the required installation-kit configuration.

Private Label Printing and Packaging

DABUND supports OEM branding including company names, logos, tube-size markings, length markings, labels, cartons, and private-label packaging.

Why Choose DABUND as Your Mini Split Kit Manufacturer?

HVAC Manufacturing Experience Since 2008

DABUND has manufactured HVAC products since 2008, including mini split installation kits, insulated copper tubing, refrigerant line sets, aluminum pipe, and related HVAC components.

Two-Factory Production Capability

DABUND factory information states two production facilities and capacity of up to approximately 1,000,000 pieces per month depending on product configuration, supporting wholesale and recurring international orders.

In-House Insulation Production

In-house insulation production supports greater control over insulation thickness, surface appearance, printed markings, customization, and production scheduling.

B2B Wholesale and Export Supply

DABUND supports distributors, importers, contractors, project buyers, and HVAC brands with bulk production, OEM configurations, private-label programs, and international export supply.

DABUND HVAC Factory

DABUND manufactures mini split installation kits, insulated copper pipe, refrigerant line sets, aluminum pipe, and related HVAC parts for international customers.

SGS Testing and HVAC Material Standards

Copper tubing can be supplied according to ASTM B280 requirements using C12200 copper according to the ordered specification. Depending on the selected insulation material and configuration, DABUND test documentation can reference ASTM E84, UL 94, ASTM D1056, and ASTM G21.

Buyers requiring specific compliance documentation should request the technical specification and test report applicable to the exact product being ordered.

DABUND HVAC Exhibitions

DABUND participates in international HVAC exhibitions where distributors, contractors, importers, and professional buyers can inspect mini split installation kits, insulated copper line sets, insulation materials, and other HVAC products.

FAQ About 50 ft 1/4" x 1/2" Mini Split Installation Kits

What is included in the 50 ft mini split air conditioner kit?

The kit can include a 50 ft 1/4" x 1/2" pre-insulated copper line set, pre-flared ends, flare nuts, communication cable, approximately 3 m of condensate drain hose, wall pipe, protective cover, and selected installation accessories.

What does 1/4" x 1/2" mean?

The dimensions refer to the outside diameters of the two copper refrigerant tubes. The 1/4" tube measures approximately 6.35 mm OD and the 1/2" tube approximately 12.70 mm OD.

What is the difference between a mini split line set and an installation kit?

A mini split line set primarily refers to the paired copper refrigerant tubes. A mini split installation kit combines the line set with additional items such as communication cable, drain hose, wall pipe, cover, and other installation accessories.

What mini split systems use a 1/4" x 1/2" line set?

A 1/4" liquid line and 1/2" suction line are commonly specified for certain small-to-medium mini split and heat pump systems. Exact pipe dimensions vary by brand and model, so always check the equipment installation manual before ordering.

Is 50 ft too long for a mini split?

It depends on the HVAC model. Every system has a maximum permitted piping length and elevation difference. A 50 ft line should only be used when it falls within the equipment manufacturer's specifications.

Does a 50 ft mini split line require additional refrigerant?

It may. Many mini split systems contain a factory refrigerant charge for a specified standard piping length. Additional refrigerant may be required when the installed line exceeds that length, according to the manufacturer's charge-per-foot or charge-per-meter instructions.

Can the 50 ft copper line set be shortened?

Yes. A qualified HVAC technician can shorten the copper tubing when appropriate. Newly prepared flare or brazed connections must follow the equipment manufacturer's procedures and applicable HVAC installation requirements.

Are the copper tube ends pre-flared?

Yes. The copper tubing can be supplied with factory-prepared flare ends and matching flare nuts, helping reduce field preparation work when the connections match the HVAC equipment.

Is the copper line set pre-insulated?

Yes. Factory-applied insulation helps reduce unwanted heat transfer, limit condensation around cold refrigerant tubing, and reduce insulation work during installation.

What insulation options are available?

DABUND offers white PE and black rubber insulation. White PE options include approximately 8 mm, 9 mm, 10 mm, 13 mm, 19 mm, and 25.4 mm. Black rubber options include approximately 13 mm, 17 mm, 19 mm, and 25.4 mm depending on configuration.

Can this kit be used outdoors?

Selected insulation configurations provide environmental and UV resistance for HVAC applications. For prolonged outdoor exposure or locations subject to physical damage, an additional line-set cover or protective conduit may be appropriate.

Can this installation kit be used with R410A or R32?

It can be supplied for compatible R410A and R32 systems when the copper diameter, wall thickness, pressure rating, cleanliness, fittings, connection method, and HVAC equipment requirements are correctly matched.

Can DABUND customize the installation kit for my brand?

Yes. DABUND supports OEM and ODM services including custom copper sizes, kit lengths, insulation materials, insulation thicknesses, accessory configurations, company-name printing, logos, labels, cartons, and private-label packaging.

Is DABUND a manufacturer or trading company?

DABUND is a manufacturer of mini split installation kits, insulated copper pipes, HVAC refrigerant line sets, aluminum pipes, and related HVAC parts.

Can I get a sample before placing a bulk order?

Yes. DABUND can provide up to 3 pieces of free samples for evaluation. Buyers normally cover the express shipping cost.

Can DABUND print my logo?

Yes. OEM and ODM orders can include customized company names, logos, product markings, labels, cartons, and private-label packaging.

What payment terms are available?

Common payment options can include T/T, L/C at sight, credit card, and other agreed payment methods according to order details.

What delivery terms does DABUND support?

DABUND can support international trade terms including EXW, FOB, CFR, CIF, and other agreed Incoterms according to customer logistics requirements.

What is the typical delivery time?

Typical production and delivery preparation is approximately 15–20 days depending on order quantity, customization requirements, and current production scheduling. Urgent orders can be discussed before confirmation.