1/4" LL x 5/8" SL x 50 ft. HVAC Line Set

50 Ft 1/4" x 5/8" HVAC Line Set

The DABUND 50 ft 1/4" x 5/8" HVAC line set is a pre-insulated copper tubing pair designed to connect the indoor and outdoor units of compatible ductless mini split air conditioners, heat pumps, VRF systems and other HVACR equipment. The set includes a 1/4-inch liquid line and a 5/8-inch suction line in a 50-foot coil for installations requiring a longer refrigerant route.

The refrigerant tubing is manufactured from C12200 phosphorus-deoxidized copper and is designed to meet ASTM B280 requirements for air-conditioning and refrigeration field service. Closed-cell black insulation helps reduce heat transfer, control condensation and protect the copper tubing during transportation, installation and operation.

Compatibility notice: A 1/4" x 5/8" line set is not suitable for every air conditioner with the same BTU or tonnage rating. Before ordering, verify the required liquid-line diameter, suction-line diameter, copper wall thickness, insulation thickness, flare size, refrigerant type, maximum line length and vertical separation in the equipment installation manual.

1/4 x 5/8 x 50 Ft Line Set Specifications

Key Features of the 50 Ft HVAC Line Set

ASTM B280 copper tubing: The line set uses C12200 DHP copper intended for air-conditioning and refrigeration applications, providing the formability required for professional routing, flaring and brazing.

50-foot installation length: The approximately 15.24-meter coil supports installations where the indoor and outdoor units are separated by a longer route. Confirm the maximum permitted equivalent length, vertical rise and any additional refrigerant-charge requirement before installation.

Pre-insulated tube pair: The 1/4-inch liquid line and 5/8-inch suction line are insulated to help limit unwanted heat transfer and surface condensation while reducing on-site insulation work.

Protected copper tube ends: Plastic end caps help prevent dust, moisture and other contaminants from entering the tubing before installation.

OEM and wholesale supply: DABUND can customize tube combinations, copper wall thicknesses, insulation specifications, coil lengths, printed identification and packaging for HVAC distributors, equipment brands and installation-kit suppliers.

Copper Tube and Insulation Construction

The two soft copper tubes are supplied as a paired coil for easier transport, storage and routing. Qualified HVAC technicians can cut, flare or braze the tubing according to the equipment manufacturer's instructions, local codes and the applicable refrigerant-system procedure.

The closed-cell insulation functions as a thermal layer and moisture-resistant barrier. Correctly sealed joints and terminations help preserve the vapor barrier, reduce condensation and protect system efficiency. Outdoor sections should be protected according to the insulation specification, local climate and installation code.

C12200 Copper Tubing

Closed-Cell Insulation

Protected Tube Ends

Insulation Performance and Available Options

Condensation control: The closed-cell structure helps reduce water-vapor transmission and surface condensation when the insulation is installed with continuous, properly sealed joints.

Thermal protection: The insulation helps limit heat gain or heat loss between the refrigerant tubing and the surrounding environment.

UV-resistant configurations: Outdoor insulation options are available. Confirm whether a protective line cover, coating or jacket is required for the intended climate and project specification.

Fire and material testing: Insulation can be supplied to applicable project requirements referencing ASTM E84, UL 94, ASTM D1056 and ASTM G21. Request the current report that matches the exact insulation material, thickness and product configuration ordered.

HVAC Applications and Equipment Compatibility

A 1/4-inch liquid line paired with a 5/8-inch suction line is specified by selected mini split, heat-pump and VRF equipment. However, nominal BTU or tonnage alone does not determine the correct refrigerant tubing size. Different manufacturers and models may require different line diameters, wall thicknesses, flare connections, maximum lengths and refrigerant adjustments.

Use this 50 ft line set only when the equipment installation manual specifies a 1/4-inch liquid line and 5/8-inch suction line and permits the proposed route. Pressure testing, evacuation, charging, flaring and brazing should be completed by qualified HVAC personnel using procedures appropriate for the refrigerant and equipment.

Available HVAC Line Set Sizes

In addition to the 1/4" x 5/8" x 50 ft HVAC line set, DABUND supplies multiple copper-tube combinations, coil lengths and insulation thicknesses for wholesale and private-label projects.

OEM HVAC Line Sets for Distributors and Brands

DABUND manufactures insulated copper pipe, mini split line sets, aluminum pipe and HVAC installation accessories. Wholesale buyers can request customized tube sizes, copper wall thicknesses, insulation materials, insulation thicknesses, printed markings, cartons and private-label packaging.

For an accurate quotation, provide the liquid-line and suction-line outside diameters, copper wall thickness, required length, insulation material and thickness, refrigerant application, working-pressure requirement, required test reports, annual quantity, packaging design and destination port.

Why Choose DABUND as Your HVAC Line Set Manufacturer?

Manufacturing experience: DABUND has produced HVAC parts since 2008 and supplies insulated copper tubing and installation products for international markets.

Flexible product configuration: Copper dimensions, insulation, printed identification and packaging can be developed for distributors, contractors, equipment suppliers and installation-kit brands.

Sample support: Qualified buyers can request product samples to evaluate dimensions, insulation construction, marking and packaging before bulk production.

Quality Documents and Test Reports

The applicable certificate or test report depends on the exact copper tube and insulation configuration ordered. Buyers should request current documentation corresponding to the selected wall thickness, insulation material, flame-performance requirement and destination-market standard.

Available technical documentation may reference ASTM B280 for refrigerant copper tubing and ASTM E84, UL 94, ASTM D1056 or ASTM G21 for applicable insulation configurations. Confirm the report number, tested construction and validity before relying on a certificate for a project submission.

Meet DABUND at HVAC Exhibitions

DABUND participates in international HVAC exhibitions where distributors and project buyers can review HVAC line sets, insulated copper tubing and related installation accessories.

Frequently Asked Questions

What does 1/4 LL x 5/8 SL mean on an HVAC line set?

LL means liquid line and SL means suction line. This product has a 1/4-inch liquid-line outside diameter and a 5/8-inch suction-line outside diameter, equivalent to approximately 6.35 mm and 15.88 mm.

Is a 1/4 x 5/8 line set suitable for every 24,000 BTU mini split?

No. Some 24,000 BTU systems use this size, but tubing requirements vary by manufacturer and model. Confirm the required diameters, wall thickness, flare connection and permitted line length in the equipment installation manual.

Can the entire 50-foot HVAC line set be used?

Only when the equipment manufacturer permits the proposed 50-foot route. Some systems require an additional refrigerant charge beyond a stated factory-charge length, and limits may also apply to vertical separation and equivalent length.

Does the line set include flare nuts or installation accessories?

The standard package should be confirmed in the quotation. DABUND can supply copper line sets alone or develop customized installation kits with specified flare nuts, communication cable, drain hose, wall sleeve, wrapping tape and other accessories.

Can this copper line set be used with R410A or R32 equipment?

The correct configuration depends on copper wall thickness, pressure rating, fittings, flare specifications and the equipment manufacturer's requirements. Provide the refrigerant and design-pressure information so the appropriate tubing configuration can be confirmed.

Why is ASTM B280 relevant to an HVAC copper line set?

ASTM B280 defines requirements for seamless copper tube intended for air-conditioning and refrigeration field service. It provides a recognized basis for specifying refrigerant tubing material, dimensions and product quality.

What insulation thicknesses can DABUND supply?

Available options include 8 mm, 9 mm, 10 mm, 13 mm, 19 mm and 25.4 mm. The correct thickness depends on tube diameter, ambient temperature, humidity, condensation risk, energy code and the project specification.

Can DABUND print my brand on the insulation and packaging?

Yes. OEM and ODM options include company names, tube-size markings, length information, labels, carton artwork and other private-label packaging details.

Can I request a sample before placing a wholesale order?

Yes. Qualified buyers can request free samples, with express freight normally paid by the buyer. Confirm the required copper dimensions, wall thickness and insulation specification before shipment.

What information is required for an HVAC line set quotation?

Provide the liquid-line and suction-line outside diameters, copper wall thickness, coil length, insulation material and thickness, refrigerant, working pressure, required certificates, packaging, order quantity and destination port.

What payment and delivery terms are available?

Common payment options include T/T, L/C at sight and credit card, subject to order approval. Delivery terms can include EXW, FOB, CFR and CIF. The final commercial terms should be confirmed in the quotation.

How long is the production lead time?

A typical production lead time is approximately 15 to 20 days. The final schedule depends on order quantity, customization, raw-material availability, packaging requirements and factory capacity at the time of order.