Method, system and device for converting a standard mini-split AC unit into a quick connect mini-split AC unit
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Solution Overview
Problem
Mini-split air conditioning systems often experience refrigerant line leaks due to improper installation, which can be prevented by converting standard units into quick connect systems for faster and more reliable installation.
Innovation Solution
A method involving the use of quick connect fittings, a custom-made fitting tool, and a vacuum process to remove moisture and add refrigerant, allowing for the conversion of standard mini-split AC systems into quick connect systems, ensuring secure connections and minimizing leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard mini-split AC units are installed using traditional flare connections, then the installation process is time-consuming and prone to leaks, but converting to quick connect fittings requires additional conversion steps and equipment
Solution Approach 1:
The conversion process divides the installation into distinct phases: preparation (removing factory fittings), conversion (installing quick connect fittings), vacuuming (moisture removal), and refrigerant charging. This segmentation allows each step to be optimized independently, reducing overall complexity while maintaining high reliability
Solution Approach 2:
The patent emphasizes performing vacuum and moisture removal operations before final refrigerant charging. By preparing the system in advance with proper vacuum levels (200 microns or lower) and conducting decay tests, the system ensures leak-free connections before refrigerant is introduced, preventing future installation failures
2Productivity
If quick connect fittings are used to speed up installation, then installation time is reduced to ten minutes per unit, but proper vacuum and moisture removal becomes critical to prevent leaks
Solution Approach 1:
The patent replaces traditional mechanical flare connection tools with quick connect fitting installation methods. This substitution reduces installation time dramatically while shifting the precision requirement to the vacuum system, where electronic micron gauges provide precise measurement and control of vacuum levels without requiring complex mechanical alignment
Solution Approach 2:
The use of micron gauges provides real-time feedback on vacuum levels during the evacuation process. The installer can monitor the vacuum reading and adjust the vacuum pump operation to achieve the target level of 200 microns or lower, ensuring proper moisture removal while maintaining installation speed
3Ease of manufacture
If flares are used for refrigerant line connections, then the system can be installed, but leaks occur due to improper installation regardless of installer skill level
Solution Approach 1:
The patent employs disposable quick connect fittings that are designed for single-use installation. These fittings eliminate the need for complex flare formation and tightening procedures, reducing installer skill requirements while ensuring consistent, leak-free connections through precision-machined sealing surfaces built into the disposable fittings themselves
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The conversion process ensures near-flawless installation, reduces installation time to approximately ten minutes per unit, and prolongs the life of HVAC equipment by preventing leaks and ensuring proper refrigerant handling.
Implementation Method 1
Begin the vacuum process. Vacuum the evaporator down to 200 microns (as a measure of moisture level) on the micron gauge that is connected to the fitting tool/device.
Implementation Method 2
This small amount of refrigerant will add positive pressure to the evaporator. By doing this, when the connection from the line set is made to the evaporator it will aid in keeping air/moisture from entering the sealed system.
Data Source
AI summary
A method, system and device provides for the conversion of a mini-split AC unit to a mini-split AC unit with quick connect pre-charged ends. Quick connect fittings are placed onto the AC unit lines after the nitrogen pre-charge is released from the liquid line. A fitting tool/device having one or more fittings and valves is attached to the liquid line. A vacuum pump attached to the fitting tool/device vacuums the evaporator until its micron level falls and stays below 500 microns. Then, a refrigerant line attached to the fitting tool/device adds approximately 1 ounce of refrigerant to the evaporator.