Parallel Wiring Harnesses for Mistake-Proof HVAC Circuit Assembly
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Solution Overview
Problem
Point-to-point wiring in HVAC systems is labor-intensive, prone to errors, and impossible to mistake-proof during manufacturing, leading to incorrect connections and troubleshooting challenges, which can result in malfunctions.
Innovation Solution
The use of electrical devices with functional terminals and jumpered terminals that are internally connected, allowing for parallel wiring harnesses to be used across various circuit configurations, including series, parallel, and branch circuits, with designated terminal combinations dictating specific connection headers for correct connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If point-to-point wiring is used to connect electrical devices, then individual connections can be made flexibly, but the wiring becomes labor-intensive and prone to errors
Solution Approach 1:
The wiring system is segmented into modular parallel wiring harnesses, each designed to connect specific groups of electrical devices. This segmentation allows pre-assembly and pre-testing of harnesses, improving productivity while maintaining connection flexibility through modular design.
Solution Approach 2:
Parallel wiring harnesses are pre-assembled and pre-tested before final installation in HVAC units. This preliminary action ensures correct connections are made beforehand, eliminating on-site wiring errors and significantly reducing assembly time during manufacturing.
2Adaptability or versatility
If point-to-point wiring is used with generic terminals, then connections can be made to various components, but mistakes cannot be prevented during manufacturing
Solution Approach 1:
Terminals are designed with asymmetric keying features that physically prevent incorrect connections. Each terminal has a unique geometry that only matches its corresponding connection header, making it impossible to make wiring mistakes during manufacturing while maintaining versatility through different terminal types.
Solution Approach 2:
Connection headers serve as intermediaries between parallel wiring harnesses and electrical device terminals. These headers incorporate keying features that mediate the connection process, ensuring that only correct terminal-header pairs can be connected, thus preventing wiring errors.
3Adaptability or versatility
If individual point-to-point harnesses are made for each connection, then specific connections can be customized, but troubleshooting becomes difficult when faults occur
Solution Approach 1:
The system incorporates feedback mechanisms where connection headers and terminals provide immediate physical feedback through keying features, preventing incorrect connections. Additionally, the standardized parallel wiring harness design provides structural feedback that helps technicians quickly identify faulty components during troubleshooting, as each harness serves a defined function.
Data Source
AI summary
An electrical device, a method of manufacturing a HVAC unit and a HVAC unit employing the electrical device are disclosed herein. In one embodiment, the electrical device includes: (1) a contact configured to indicate a status of the electrical device and (2) terminals configured to terminate connections, the terminals having: (2A) a pair of functional terminals internally connected across the contact and (2B) a pair of jumpered terminals independent of the pair of functional terminals and internally connected together. Designated combinations of the terminals indicate a circuit configuration for the electrical device with each of the terminals having a particular design that dictates a specific corresponding connection header be used for each of the designated combinations.