MRCOOL DIY 5th Gen 50 Ft. Pre-Charged Quick Connect Line Set with DIY Pro Cable, 3/8" x 5/8", for DIY 24K & 36K Mini Split Indoor Air Handler

MRCOOL DIY 5th Gen 50 Ft. Pre-Charged Quick Connect Line Set with DIY Pro Cable, 3/8" x 5/8", for DIY 24K & 36K Mini Split Indoor Air Handler

The MRCOOL DIY® 5th Gen 50 ft Pre-Charged Quick Connect Line Set with DIY Pro Cable (3/8″ x 5/8″) is a complete refrigerant and wiring solution designed for extended-distance mini-split HVAC installations. Engineered for use with MRCOOL 24K and 36K DIY 5th Gen indoor units, this 50-foot line set arrives factory pre-charged with R-454B refrigerant, eliminating the need for vacuuming or on-site refrigerant charging. Its Quick Connect fittings enable secure, leak-resistant connections without specialized HVAC tools, making installation simpler and faster for both DIYers and professionals.

This line set includes the DIY Pro communication and power cable, providing the necessary wiring for communication and electrical power between the indoor and outdoor units. The 3/8″ liquid line and 5/8″ suction line are sized to match the refrigerant flow needs of compatible indoor units, helping maintain efficient system performance across a longer run. The combined refrigerant and cable package streamlines the installation process with a single ready-to-connect assembly.

Built with durable materials and weather-resistant insulation, this line set is designed to withstand outdoor exposures, such as UV and temperature changes, ensuring year-round reliability. The generous 50-ft length offers flexibility for installations where indoor and outdoor components must be placed far apart — including across larger homes, detached structures, or multi-level placements.

Whether you’re upgrading an existing system or installing a new MRCOOL DIY mini-split setup, the 50 ft Pre-Charged Quick Connect Line Set with DIY Pro Cable delivers a user-friendly, dependable solution for extended-reach connections, combining pre-charged refrigerant convenience with integrated power and communication wiring.

Features

• Pre-Charged with R-454B – Factory-sealed and prefilled with R-454B refrigerant for a fast, clean, and safe connection process.
• Quick Connect Fittings – Equipped with MRCOOL’s proprietary tool-free fittings that enable a secure, leak-proof seal without vacuuming.
• 50 Ft. Line Length – Provides extended reach for installations with greater distances between indoor and outdoor units.
• Heavy-Duty DIY Pro Cable – Includes a durable, weather-resistant communication and power cable, pre-sized and matched to system requirements.
• Sized for High-Capacity Units – Designed for MRCOOL 24K & 36K 5th Gen air handlers, with 3/8" liquid and 5/8" suction line compatibility.
• UV & Weather Resistant Jacket – Features a rugged outer layer to protect against sunlight, moisture, and abrasion in outdoor environments.

Specifications

Applications

• Extended installations – Ideal for setups requiring long-distance connections between indoor and outdoor units

• Second-story or basement units – Works well in homes with vertical separation between air handler and condenser

• Detached structures – Excellent for garages, workshops, or outbuildings requiring extended reach

• Large room coverage – Supports installations in open-plan areas or wide structural layouts

• DIY retrofits or replacements – A reliable solution for upgrading existing MRCOOL line sets

What’s Included

• 50 Ft. Line Set (3/8" x 5/8")

• DIY Pro Communication & Power Cable

• Pre-installed Quick Connect fittings
  

Frequently-Asked Questions

Is this line set compatible with smaller MRCOOL systems?
No. This specific model is designed only for 24K and 36K MRCOOL 5th Gen indoor air handlers. It will not work with smaller units like 12K or 9K.

Does it come prefilled with refrigerant?
Yes. It is factory pre-charged with R-454B, sealed and ready to connect—no additional refrigerant or vacuuming required.

Can I use this line set if I only need 30 or 40 feet?
No. The full 50-foot length must be used to preserve the sealed refrigerant system. It should not be cut or altered.

Is it hard to install for a first-time DIYer?
This product is designed for DIY-friendly installation, especially when paired with a MRCOOL DIY condenser and air handler. However, if you're unsure, a certified HVAC installer can ensure everything is connected properly.