MRCOOL DIY® Quick Connect® Line Set – 5th Generation

This MRCOOL DIY® Quick Connect® Line Set is designed exclusively for 5th Generation MRCOOL DIY ductless mini split systems. It connects the outdoor condenser to the indoor air handler and allows homeowners to complete installation without specialized HVAC tools.

Each line set is factory pre-charged with R-454B refrigerant and features patented Quick Connect® fittings. When tightened, the valves open automatically to allow refrigerant to flow, eliminating the need for vacuuming, cutting, brazing, or charging.

The copper tubing is engineered to resist kinking, but care must be taken during installation. When bending the line set, bends should never exceed 90 degrees, and all bends should be made slowly and gradually. Sharp or rapid bending can damage the copper tubing and insulation, which may lead to restricted refrigerant flow or line failure.

The line set is wrapped in durable, UV-resistant insulation to help protect against sun exposure, weather, and outdoor conditions, supporting long-term reliability and efficient operation.

Shorter line set lengths do not include a communication wire. When purchasing a complete MRCOOL DIY system with an air handler, the required communication cable is included with the indoor unit.

Longer installations are supported through extended configurations. For 66 ft and 75 ft total runs, multiple line sets must be connected using a compatible MRCOOL DIY coupler. The maximum allowable combined length per zone is 75 ft and cannot be exceeded. For multi-zone systems, each indoor unit requires its own dedicated line set.

Important Note: Any tools shown in product photos are for demonstration purposes only and are not included with the line set.

This line set is engineered specifically for 5th Generation MRCOOL DIY systems and is not compatible with earlier generations that use different refrigerants.

📄 Single Zone Specs 📄 Multi Zone Specs 📄 Ceiling Cassette Specs

MRCOOL DIY Mini Split Sizing Guide

Which air handler is best for your room size?

The size of your room is the main factor in choosing the right unit. MRCOOL DIY 4th Gen comes in various sizes, each designed to cool and heat specific square footage ranges.

Here's a quick reference for choosing the right BTU based on your room size:

• 6,000 BTU covers up to 250 square feet
• 9,000 BTU covers up to 350 square feet.
• 12,000 BTU covers up to 550 square feet.
• 18,000 BTU covers up to 800 square feet.
• 24,000 BTU covers up to 1,050 square feet.
• 36,000 BTU covers up to 1,500 square feet.

How BTU Limits Work in Your Mini-Split System

You can opt for high BTU air handlers for strong heating and cooling. But, if you plan to run multiple air handlers at the same time, consider the main unit's (condenser) maximum power.

Here’s the deal: Suppose your condenser can handle 18,000 BTU, and you have two indoor air handlers, each at 12,000 BTU. If both run simultaneously, they’ll automatically adjust to 9,000 BTU each to match the condenser's limit. This ensures the system runs safely.

If you usually run one air handler at a time, a lower BTU condenser might be sufficient. But if you plan to use all air handlers together, a higher BTU condenser is the way to go. This lets you enjoy the full power of each air handler without overloading the system.

By considering these factors, you can ensure your MRCOOL DIY 4th Gen unit is perfectly sized for your needs, keeping you comfortable year-round.

For personalized assistance or further clarification, please feel free to contact our customer support via chat or call. Our team is ready to help you make the best choice for your cooling needs.

DIY Multi-Zone Manuals

MRCOOL DIY Mini Splits Warranty

MRCOOL distributor (hereinafter “Company”) warrants this product against failure due to defects in materials or workmanship under normal use and maintenance as follows:

• Standard Warranty: 5-year parts warranty and 7-year compressor warranty.
• Limited Lifetime Compressor Warranty: Available if specific conditions are met.

Conditions for Limited Lifetime Compressor Warranty:

• Registration: The unit must be registered at the following web address: https://mrcool.com/warranty within 60 days of the installation date.

• MrCool Care Program Enrollment: The original, registered owner must enroll in the MrCool Care program within 4 months from the installation date. This program requires a biannual fee and includes a DIY cleaning kit for regular maintenance.

• Regular Maintenance: The unit must be cleaned biannually using the MrCool Care kit as part of the preventative maintenance to ensure proper function throughout its lifespan.

Coverage Details:

• Within the First 7 Years: If compressor failure occurs, verified by diagnostic testing performed by a certified HVAC technician, the warranty provides one entire unit replacement (equipment only).
• After 7 Years: The limited lifetime compressor warranty covers the cost of a replacement compressor (equipment only).

Important Notes:

• The warranty does not cover any costs incurred for diagnosis or replacement of equipment.
• If the original owner does not register the unit, the warranty defaults to the standard 5-year parts and 7-year compressor warranty.
  
  

📑 DIY Multi-Zone Brochure

📑 Quick Start Setup Guide

📑 Installation Owner's Manual

📑 Performance Specification

📑 Troubleshooting Solution Guide

📑 Remote Control User Manual

📑 Ceiling Cassette Manual

📑 Ceiling Cassette Specification

📑 Warranty Statement

📑 Multi-Zone AHRI Certifications: 18K BTU - 27K BTU - 36K BTU - 48K BTU

📑 Multi-Zone Energy Guide Certifications: 18K BTU - 27K BTU - 36K BTU - 48K BTU