HVAC Communication Interface for Rooftop Unit Wireless Access
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Solution Overview
Problem
Existing HVAC systems lack efficient communication methods between rooftop air handling units and portable electronic devices, limiting remote monitoring and control capabilities.
Innovation Solution
A device and method that utilize a wire terminal and transceiver to extract information from a rooftop air handling unit's controller and wirelessly transmit it to a portable electronic device, enabling communication through a serial communications protocol and wireless connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wired connection is used to communicate with the rooftop air handling unit controller, then reliable data transmission is achieved, but portability and ease of remote access are reduced
Solution Approach 1:
The patent introduces a communication interface device as an intermediary between the wired HVAC controller and the wireless portable device. This interface receives data through wired connections (RS-485, BACnet, LonWorks) from the controller and retransmits it wirelessly via WiFi, Bluetooth, or cellular connections to portable devices, thereby bridging the reliability of wired communication with the accessibility of wireless communication.
2Ease of operation
If wireless communication is implemented directly between the controller and portable device, then portability and remote access are improved, but communication protocol compatibility and signal stability are worsened
Solution Approach 1:
The communication interface device serves as a protocol translator and signal stabilizer. It receives stable wired signals from the HVAC controller using industry-standard protocols (BACnet, LonWorks, RS-485) and converts them into wireless transmissions. This intermediary role ensures that the wireless communication inherits the reliability of wired protocols while providing the mobility benefits of wireless technology.
Solution Approach 2:
The patent replaces the mechanical/wired communication system with a wireless electronic communication system at the portable device interface. By substituting physical cable connections with electromagnetic wireless transmission (WiFi, Bluetooth, cellular), the system maintains communication functionality while eliminating the need for physical connectivity, thereby improving portability and remote access.
3Adaptability or versatility
If multiple communication protocols are supported in the controller, then versatility is improved, but device complexity increases
Solution Approach 1:
The patent divides the multi-protocol communication functionality into separate modular components. The HVAC controller maintains its existing single-protocol communication interface, while the separate communication interface device handles protocol translation and conversion. This segmentation allows each device to remain simple while the system as a whole achieves multi-protocol versatility through the interface device's ability to speak multiple protocols.
Data Source
AI summary
A device for communicating information from a controller for a rooftop air handling unit to a portable electronic device includes a wire terminal for wiring to the controller and for receiving a signal comprising information from the controller. The device further includes a transceiver configured to wirelessly transmit the information to the portable electronic device. The device yet further includes a circuit coupled to the wire terminal and the transceiver. The circuit is configured to extract the information from the signal. The circuit is further configured to provide the information from the wire terminal to the transceiver.