Description
The HVAC365 3/8-inch x 5/8-inch copper line set is a 35-foot refrigerant piping assembly designed for compatible ductless mini-split installations. It provides the paired copper tubes used to connect an indoor air handler with its matching outdoor condenser, allowing refrigerant to circulate through the system. This line set is intended for HVAC contractors, installers, and property owners whose equipment documentation specifically requires 3/8-inch and 5/8-inch refrigerant connections.
With 35 feet of tubing, this option supports installations where the indoor and outdoor units are separated by a longer route. It may be useful when the outdoor condenser is installed around a building corner, on another level, or farther from the indoor unit. The complete planned routing distance must be measured before ordering, including bends, wall penetrations, vertical sections, service allowances, and the final connection points.
The tubing is supplied in a pre-flared configuration, which can reduce the amount of end preparation required when the factory flares match the equipment connections. Included insulation helps protect the refrigerant tubing and limit unwanted heat transfer. The flares, insulation, and tubing must still be inspected before installation.
Key Features
- 3/8-inch and 5/8-inch tube sizes: Provides the two listed copper tubing diameters for compatible ductless HVAC equipment
- 35-foot line-set length: Supports installations requiring more distance between the indoor and outdoor units
- Pre-flared configuration: Helps reduce on-site tube-end preparation when the supplied flares match the equipment
- Insulated copper tubing: Includes insulation to support proper refrigerant piping installation
- Ductless mini-split application: Designed to connect compatible indoor and outdoor mini-split components
- HVAC365 SKU 3858-35-HVAC365: Identifies the specific 35-foot line set with 3/8-inch and 5/8-inch tubing
The coiled line set has a listed product weight of approximately 15 pounds. During handling and installation, the tubing should be uncoiled carefully to avoid kinks, flattened areas, damaged flare ends, or torn insulation. Bends should remain within the limits specified by the equipment manufacturer and applicable installation practices.
The size, length, pre-flared construction, insulation, SKU, and listed weight are confirmed on the HVAC365 product page.
Compatibility and Installation Notes
This line set is not universally compatible with every ductless mini-split system. Confirm that both the indoor and outdoor units specify 3/8-inch and 5/8-inch refrigerant connections. Equipment capacity or brand alone does not verify compatibility because connection sizes can differ between product series and models.
The 35-foot length must also fall within the HVAC manufacturer’s permitted minimum and maximum piping limits. Refrigerant-charge requirements must be checked before installation. Some condensers include enough factory refrigerant for a specified piping length, while longer installations may require an additional charge calculated according to the equipment manual.
Pre-flared tubing does not eliminate installation procedures. Each flare should be inspected for cracks, deformation, contamination, or other damage. Connections must be aligned correctly and tightened to the manufacturer’s specified torque. The completed refrigerant circuit must then be evacuated, leak tested, and commissioned by a qualified HVAC professional.
The listing does not identify communication wire, condensate tubing, wall sleeves, flare adapters, line-hide covers, mounting hardware, or other accessories as included. Buyers should confirm every required installation component before beginning the project.
Frequently Asked Questions
What tubing sizes are included?
The line set includes 3/8-inch and 5/8-inch copper tubing.
What is the line-set length?
The listed tubing length is 35 feet.
Will this line set fit every mini split?
No. It should only be used with equipment requiring these exact connection sizes.
Does a 35-foot installation require additional refrigerant?
That depends on the condenser’s factory-charge allowance. Check the equipment manual for its chargeless length and additional-charge requirements.
Can excess tubing be cut off?
A qualified technician may shorten the tubing when permitted, but the cut end will require proper preparation and a new flare.
Confirm your equipment’s connection sizes, permitted piping length, and refrigerant requirements before purchasing this HVAC365 line set.
