Cambridge 221881 Mini Split Line Set 1/4x3/8 25 Ft

Product Description

The CAMBRIDGE 221881 is a pre-insulated mini split line set designed to connect the indoor air handler to the outdoor condensing unit in ductless mini split systems. The set consists of two refrigerant lines measuring 1/4 inch and 3/8 inch in diameter with a total run length of 25 feet. This line set does not include a communication or power wire, making it suited for installations where wiring is run separately. HVAC technicians use this line set during new mini split installations or when replacing damaged refrigerant tubing on existing ductless systems.

This line set is used in residential and light commercial ductless mini split installations. The 25-foot length accommodates standard single-zone applications where the indoor and outdoor units are within a typical wall-to-wall or floor-to-rooftop run distance. It is installed by licensed HVAC technicians as part of the refrigerant circuit between evaporator and condenser. The absence of a bundled wire makes it a practical choice when a separate communication cable or whip is already sourced or when the installer prefers independent routing of electrical conductors.

Key Features

• 1/4 inch liquid line and 3/8 inch suction line diameter configuration for standard mini split sizing
• 25-foot total length covers typical single-zone residential runs
• No wire included, allowing independent routing of communication or power conductors
• Pre-insulated tubing helps protect refrigerant lines from heat gain and condensation
• Compatible with common residential ductless mini split refrigerant systems

Compatibility

Designed as an OEM-style replacement or new-installation line set for ductless mini split systems requiring a 1/4 inch by 3/8 inch line set configuration. Cross-reference part numbers noted in product data include 223502, 406K025B3B6L, and B143812025.

Installation Notes

Installation should be performed by a certified HVAC technician holding an EPA Section 608 refrigerant handling certification. Recover any existing refrigerant and isolate both the indoor and outdoor units before disconnecting or connecting refrigerant lines. Flare or braze connections according to the system manufacturer specifications and local mechanical code requirements. Avoid kinking the tubing during routing, and verify all joints are leak-tested under pressure before recharging the system.

Technical Specifications

• Liquid Line Diameter: 1/4 inch
• Suction Line Diameter: 3/8 inch
• Length: 25 feet
• Wire Included: No

Standard Information

• Brand: CAMBRIDGE
• Manufacturer Part Number: 221881