Removable DIP Switch Circuit Card Assembly for HVAC Actuator Access
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Solution Overview
Problem
The installation of HVAC system actuators with DIP switches is hindered when ductwork blocks access, forcing technicians to reach into tight spaces, and local fire codes may prohibit removing fire damper actuators, posing safety and compliance issues.
Innovation Solution
A removable dual in-line package (DIP) switch circuit card assembly that includes a printed wiring board, an enclosure cap, and DIP switches, allowing for easy insertion and removal without requiring access door opening, with a handle for user grip and a seal to prevent fluid ingress, and connector pins for electrical coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If DIP switches are mounted to a main control board reachable via an access door, then the DIP switches can be accessed for configuration, but ductwork blocks access to the access door forcing technicians to reach into tight spaces
Solution Approach 1:
The DIP switch assembly is segmented from the main control board and mounted on a separate removable circuit card assembly (CCA). This allows the DIP switches to be accessed independently through a dedicated access opening without requiring access to the main control board, thereby solving the problem of ductwork blocking the access door.
Solution Approach 2:
A removable CCA serves as an intermediary carrier for the DIP switches. The CCA can be easily inserted and removed through a dedicated opening, providing a simple mechanism to access and reconfigure DIP switches without complex disassembly or reaching into tight spaces.
2Ease of operation
If fire damper actuators are removed for DIP switch configuration, then the switches can be accessed, but local fire codes prohibit removal creating safety and compliance issues
Solution Approach 1:
The DIP switch configuration capability is segmented into a separate removable CCA that can be accessed without removing the fire damper actuator from the ductwork. This maintains the integrity and compliance of the fire safety system while providing easy access to configuration switches.
Solution Approach 2:
The removable CCA acts as an intermediary that provides DIP switch access through a dedicated opening, eliminating the need to remove the fire damper actuator entirely. This preserves system compliance and safety while enabling configuration.
3Ease of operation
If technicians reach into ductwork to set DIP switches, then configuration is possible, but safety issues arise from working in confined spaces
Solution Approach 1:
The DIP switch assembly is segmented onto a separate removable CCA with its own dedicated access opening. This allows configuration to be performed from outside the ductwork, eliminating safety hazards associated with reaching into confined spaces while maintaining full configurability.
4Adaptability or versatility
If DIP switches are integrated into the main control board, then system integration is achieved, but access is blocked by ductwork positioning
Solution Approach 1:
The DIP switch functionality is segmented from the main control board onto a separate removable CCA. This segmentation allows the main control board to remain integrated in the actuator while the DIP switches are mounted on a separate card that can be accessed through a dedicated opening, achieving both system integration and accessibility.
Solution Approach 2:
The DIP switch access is moved to another dimension by creating a separate access opening specifically for the CCA. This spatial separation allows DIP switches to be accessed from a different location than the main control board, bypassing the ductwork blocking issue while maintaining system integration.
Data Source
AI summary
A removable circuit card assembly configured to be inserted into an HVAC device is provided. The removable circuit card assembly includes a printed wiring board, an enclosure cap coupled to the printed wiring board, and a dual in-line package (DIP) switch component coupled to the printed wiring board. The DIP switch component includes multiple DIP switches. Each of the DIP switches is configured to be actuated between a first position and a second position.