MRCOOL DIY 5th Gen 50 Ft. Pre-Charged Quick Connect Line Set with DIY Pro Cable, 1/4" x 1/2", for DIY 18K Mini Split Indoor Air Handler

MRCOOL DIY 5th Gen 50 Ft. Pre-Charged Quick Connect Line Set with DIY Pro Cable, 1/4" x 1/2", for DIY 18K Mini Split Indoor Air Handler

The MRCOOL DIY® 5th Gen 50 ft Pre‑Charged Quick Connect Line Set with DIY Pro Cable (1/4″ x 1/2″) is a fully equipped refrigerant line set designed to make mini‑split HVAC installations easier and more reliable. This 50‑foot line set comes factory pre‑charged with R‑454B refrigerant, meaning no vacuuming or on‑site refrigerant charging is required. Its Quick Connect® fittings allow secure, leak‑resistant connections without specialized HVAC tools, making it ideal for both DIY installers and professionals.

Engineered for use with 9K, 12K, and 18K BTU indoor units, the line set features a 1/4″ liquid line and a 1/2″ suction line — providing the appropriate sizing to ensure proper refrigerant flow and system performance with these unit capacities. The included DIY Pro communication and power cable further simplifies installation by bundling both refrigerant and electrical connections in a single solution.

Built with durable tubing and weather‑resistant insulation, this line set is designed to withstand outdoor conditions and protect the refrigerant lines from environmental exposure. This contributes to long‑term, dependable performance and helps maintain the efficiency of your HVAC system throughout seasonal changes.

Perfect for homeowners and HVAC installers working on mini‑split system setups with longer distances between indoor and outdoor components, the MRCOOL DIY® 50 ft Pre‑Charged Quick Connect Line Set with DIY Pro Cable offers flexibility, convenience, and a straightforward installation experience without compromising performance or reliability.

Features

• Pre-Charged Line Set – Comes charged with R-454B refrigerant and sealed from the factory, ensuring no refrigerant loss during connection.
• Extended Length – 50 feet of line gives you the flexibility to position units farther apart for more complex layouts or detached structures.
• Quick Connect Fittings – MRCOOL’s patented fittings allow for a tool-free, leak-free installation without the need for a licensed HVAC tech.
• 1/4" x 1/2" Line Size – Specifically sized for 18K BTU indoor air handlers, ensuring proper refrigerant flow and performance.
• Durable DIY Pro Cable – Includes high-grade, weather-resistant communication and power cable for seamless system operation.
• Flexible Insulation Jacket – Insulated line set is built with a UV and weather-resistant jacket to protect the system from harsh outdoor conditions.

Specifications

Applications

• Long-Distance Installations – Perfect for running between indoor and outdoor units in larger homes or offices

• Detached Structures – Great for setups like garages, shops, or outbuildings needing extended reach

• Custom Layouts – Ideal for non-linear or multi-story configurations where standard line sets are too short

• DIY Installations – Designed for homeowners completing their own mini split setups without vacuuming

• System Upgrades – Compatible with MRCOOL 5th Gen DIY 18K BTU indoor air handlers needing replacement or upgrade

What’s Included

• 50 Ft. Line Set (1/4" x 1/2")

• DIY Pro Communication Cable

Frequently-Asked Questions

Can I install this line set myself?
Yes, this line set is specifically designed for DIY installation using MRCOOL’s Quick Connect technology. No vacuuming, brazing, or charging is required.

What systems is this compatible with?
This product is built for MRCOOL 5th Gen DIY 18K BTU indoor air handlers and will not work properly with incompatible units or different line sizes.

Does it come with refrigerant?
Yes, the line set is factory pre-charged with R-454B refrigerant, sealed, and ready to connect upon installation.

Can I use this for a second air handler?
This line set is meant for one 18K air handler. For multi-zone systems, you will need a compatible setup and additional accessories specific to your unit model.