MRCOOL 25FT 1/4 x 1/2 Flared Line Set Kit for 12K and 18K Olympus and Advantage Mini Split, MC25-1412

MRCOOL 25FT 1/4" x 1/2" Flared Line Set Kit (MC25-1412)

The MRCOOL MC25-1412 represents a purpose-engineered refrigerant line set specifically designed for seamless integration with MRCOOL's Olympus and Advantage 12K and 18K BTU mini-split systems. This precision-manufactured copper line set provides the critical connection between outdoor condensing units and indoor air handlers, ensuring optimal refrigerant flow and system performance.

This specialized line set provides the exact specifications required for proper operation of MRCOOL's smaller-capacity mini-split systems:

• Precise Sizing: Features 1/4" liquid line and 1/2" suction line diameters, precisely calibrated for optimal refrigerant flow in 12K and 18K BTU applications
• Optimal Length: 25-foot length provides sufficient reach for most standard residential installations while staying within maximum recommended length specifications
• Professional Connections: Pre-flared ends with correctly sized fittings (3/8" liquid line fitting, 5/8" suction line fitting) ensure proper sealing at connection points
• Premium Materials: Constructed from high-grade copper tubing that meets ASTM B280 standards for refrigeration applications
• Factory Preparation: Line set arrives clean, capped, and ready for installation, eliminating field preparation requirements

The MC25-1412's exact specifications are critical for maintaining proper refrigerant flow, system charge, and operational efficiency in these smaller mini-split applications.

This line set incorporates several features that simplify the installation process:

• Pre-Flared Ends: Factory-flared connections eliminate the need for flaring tools and reduce the risk of improper flares that can lead to refrigerant leaks
• Correct Sizing: Properly sized for 12K and 18K BTU applications, eliminating guesswork and ensuring compatibility
• Standard Length: 25-foot length covers most residential installations without requiring field modifications
• Simple Connection Process: Designed for straightforward connection to MRCOOL Olympus and Advantage system fittings
• Installation Flexibility: Sufficient length and flexibility to navigate various installation paths between indoor and outdoor units

These features significantly reduce installation time while promoting proper system setup—critical factors for both professional contractors and DIY installers.

The MC25-1412 line set is specifically designed for:

• MRCOOL Olympus 12K BTU Mini-Split Systems
• MRCOOL Olympus 18K BTU Mini-Split Systems
• MRCOOL Advantage 12K BTU Mini-Split Systems
• MRCOOL Advantage 18K BTU Mini-Split Systems

The precise sizing makes this line set incompatible with larger capacity mini-split systems that require different line diameters. This specificity ensures optimal performance within the designed application range.

The proper installation of this line set directly impacts several critical performance factors:

• Refrigerant Flow Efficiency: Correct line sizing ensures proper refrigerant velocity and return oil flow
• Thermal Transfer: Optimized line diameters minimize pressure drops that can reduce system efficiency
• System Reliability: Factory-flared ends promote proper connections that minimize leak potential
• Sound Performance: Proper sizing helps reduce refrigerant noise that can occur with incorrectly sized lines
• Energy Efficiency: Maintaining manufacturer-specified line dimensions preserves the system's rated efficiency

While the MC25-1412 simplifies installation, several best practices should be followed:

1. Maintain Minimum Bend Radius: Avoid sharp bends that can restrict refrigerant flow or damage the tubing
2. Proper Support: Use appropriate hangers/supports every 4-6 feet to prevent sagging
3. Insulation Integrity: Ensure the insulation remains intact and sealed throughout the installation
4. Connection Technique: Apply proper refrigeration oil to flare surfaces before connection
5. Torque Specifications: Follow manufacturer-recommended torque specifications when tightening flare nuts
6. Leak Testing: Pressure test all connections before system evacuation and charging

The MC25-1412 line set package includes:

• 25 feet of insulated 1/4" liquid line and 1/2" suction line copper tubing with factory-flared ends
• Complete with appropriate connection fittings for MRCOOL Olympus and Advantage systems
• Batteries (for system remote control)

The package dimensions (28-1/2"W x 3-1/2"H x 29"D) reflect the coiled configuration for shipping and storage.

This product includes a Proposition 65 warning and has shipping restrictions to certain U.S. territories (GU, PR, VI). Unlike the main MRCOOL HVAC components, the line set itself does not carry a separate registered warranty, as it is considered an installation material rather than an active system component.

The MRCOOL MC25-1412 line set represents a critical component in the proper installation of Olympus and Advantage 12K and 18K BTU mini-split systems. By providing precisely sized, pre-flared refrigerant lines manufactured to exacting standards, this line set ensures the refrigerant connection between indoor and outdoor units maintains optimal flow characteristics—preserving system efficiency, reliability, and performance. For contractors and DIY installers working with these MRCOOL systems, the MC25-1412 eliminates the guesswork and specialized preparation often associated with refrigerant line installation, supporting both proper system function and installation efficiency.

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