HVAC Controller Communication Over Low-Voltage Power Lines
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Solution Overview
Problem
Conventional HVAC systems require extensive wiring for controlling various components, making system replacements labor-intensive and costly, as each component typically needs a dedicated wire for communication, leading to potential mis-wiring issues during installation.
Innovation Solution
A system utilizing low-frequency low-voltage waveforms on hot and common power transmission lines for communication between controllers, allowing signals to be superimposed and identifying destination controllers, eliminating the need for dedicated wires between thermostats and HVAC components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated wires are used to connect thermostat to each HVAC component, then reliable control signals can be transmitted, but wiring complexity and installation cost increase significantly
Solution Approach 1:
The patent combines multiple control signal transmission functions into a single shared wire infrastructure. The thermostat and HVAC components communicate over a common communication bus, eliminating the need for separate dedicated wires between the thermostat and each component (furnace, air handler, condenser, etc.). This merging approach maintains reliable control while dramatically reducing wiring complexity.
Solution Approach 2:
The shared communication wire serves multiple functions: it carries control signals from the thermostat to various HVAC components, transmits status information back to the thermostat, and enables interactive communication between components. This universal communication medium replaces multiple specialized wiring paths, reducing overall system complexity while maintaining functional reliability.
2Adaptability or versatility
If multiple wires are installed for each HVAC component, then system functionality can be expanded, but labor-intensive installation and replacement costs increase
Solution Approach 1:
The shared communication wire infrastructure provides universal connectivity that supports multiple HVAC components and functions without requiring additional wiring for each new component. The system can be expanded by adding components that connect to the existing communication bus, eliminating the need for new dedicated wires and significantly reducing installation time.
Solution Approach 2:
The system allows dynamic configuration and expansion of HVAC components without fixed wiring constraints. Controllers can be added or removed from the communication network flexibly, and the system adapts to changing functional requirements without requiring physical rewiring, thus reducing both initial installation time and future modification time.
3Ease of operation
If extensive wiring is used for HVAC control, then complete control of all components is achieved, but mis-wiring issues occur during installation
Solution Approach 1:
The patent implements segmented addressing where each controller on the communication bus has a unique identifier. This segmentation allows the thermostat to selectively address and control specific components without confusion, even though all components share the same physical wire. The digital addressing scheme eliminates mis-wiring issues by ensuring signals are routed to the correct destination through logical identification rather than physical wire assignment.
Solution Approach 2:
The interactive communication system incorporates feedback mechanisms where controllers confirm receipt of commands and report their status back to the thermostat. This feedback loop allows real-time verification that control signals are being received by the correct components, immediately detecting and preventing mis-wiring issues during installation and operation.
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
Enables efficient, interactive control of HVAC systems by reducing wiring complexity, improving operational flexibility, and preventing mis-wiring, while allowing controllers to modify operations based on received signals, thus enhancing system performance and safety.
Implementation Method 1
Each controller is capable of transmitting one or more signals that are superimposed onto the low-frequency low-voltage waveform
Data Source
AI summary
A system for controlling one or more components of a climate control system is provided that includes one or more controllers in connection with low voltage power lines for powering the one or more controllers. The controllers are further capable of transmitting one or more communication signals via the low voltage waveform. The system includes a thermostat controller, at least one system controller for a heating or cooling system, and a controller for a circulating air blower. The thermostat controller, system controller and circulating air blower controller are connected to each other only through each controller's individual connection to the hot and common low voltage power transmission lines. Each controller is capable of transmitting one or more signals that are superimposed onto the low-frequency low-voltage waveform and include information identifying a destination controller that the signals are intended for.