Pre-Charged Ductless HVAC Installation Through a Window Sill
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Solution Overview
Problem
The installation of ductless HVAC systems requires licensed personnel for electrical connections and refrigerant charging, which is a barrier to installation by unlicensed personnel due to safety regulations and codes.
Innovation Solution
A pre-packaged, pre-charged ductless HVAC system with a cable sheath for connecting indoor and outdoor units, an expandable window sill for passing the cable sheath through a window, and a cord retention bracket to secure the electrical line, allowing for safe and code-compliant installation by unlicensed personnel without the need for licensed electricians or refrigeration technicians.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical connections and refrigerant charging are performed according to safety codes and regulations, then safety and compliance are ensured, but the installation process requires licensed personnel which increases complexity and cost
Solution Approach 1:
The system comes pre-charged with refrigerant and pre-configured with electrical connections at the factory. The outdoor unit includes pre-assembled electrical disconnects and the refrigerant is pre-filled in sealed containers, eliminating the need for on-site refrigerant charging and complex electrical work by licensed personnel.
Solution Approach 2:
A pre-assembled cable sheath containing both electrical conductors and refrigerant lines is used as an intermediary component. This single integrated cable replaces the need for separate electrical wiring and refrigerant piping, simplifying the installation process while maintaining code compliance for both electrical and refrigerant systems.
2Reliability
If licensed electricians and refrigeration technicians are required for installation, then code compliance is achieved, but installation time and cost increase
Solution Approach 1:
All code-compliant electrical connections and refrigerant charging are performed in advance at the factory under controlled conditions. The outdoor unit arrives with electrical disconnects pre-installed and refrigerant pre-charged in sealed containers, allowing unlicensed personnel to complete installation by simply connecting pre-assembled components rather than performing complex electrical or refrigerant work.
Solution Approach 2:
The system is divided into pre-assembled modules: the outdoor unit with integrated electrical disconnect and refrigerant charge, and a pre-assembled cable sheath containing electrical and refrigerant lines. This segmentation allows each component to be prepared independently in advance, reducing on-site installation time and eliminating the need for licensed specialists during installation.
3Ease of operation
If pre-charged refrigerant containers are used, then refrigerant handling compliance is simplified, but the container design must ensure safe transport and installation
Solution Approach 1:
The refrigerant container is nested within the outdoor unit housing, with the container physically integrated into the unit structure. This nested design protects the refrigerant container during transport and installation while allowing for simple connection to the refrigerant distribution system, maintaining both safety and ease of handling.
Data Source
AI summary
A pre-charged heating/cooling system is shown for installation by unlicensed personnel. An outside unit includes an outside coil, outside fan, compressor and a reversing valve. An inside unit has an inside coil, inside fan for drawing air through the inside coil and discharging the conditioned air into the enclosed space, and a power cord connection. A cable sheath contains all connections from the inside unit to the outside unit with electrical connections being secured in position on the outside unit by a cover and a bracket. An expandable window sill holds and seals the cable sheath in a window opening.