HVAC Controller With Power Relay for Off-Season Pre-Test Operation
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Solution Overview
Problem
HVAC systems are often neglected during off seasons, leading to uncertainty about their performance under stress, and resulting in failures at critical times, necessitating a method to test HVAC systems during off seasons to identify potential issues before they become critical.
Innovation Solution
A pre-season test (PST) system that runs a controlled heating or cooling test on an HVAC system using a software or firmware module, which can be executed on a programmable thermostat or HVAC controller, to produce detailed reports on HVAC operation and provide recommendations for readiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HVAC systems are not tested during off seasons, then users can save time and avoid unnecessary maintenance, but the system reliability deteriorates leading to failures at critical times
Solution Approach 1:
The system performs preliminary testing during the off-season when the HVAC system is not under stress, identifying potential maintenance, repair, and installation issues before they become critical. This advance action ensures system reliability when needed most without requiring time-consuming emergency repairs during peak seasons.
2Ease of operation
If a third party controls and monitors the testing system, then the ease of operation improves for users, but the device complexity increases
Solution Approach 1:
A third-party controller or monitoring system acts as an intermediary between the user and the HVAC testing system. This intermediary manages the complex testing procedures, data collection, and analysis automatically, providing users with a simple interface while handling the sophisticated testing operations in the background.
3Adaptability or versatility
If the PST system is implemented as a universal monitoring board, then the adaptability improves for different HVAC systems, but the device complexity increases
Solution Approach 1:
The monitoring board is designed as a universal device that can interface with multiple types of HVAC systems and thermostats through standardized communication protocols. It provides multi-functional capabilities including testing, monitoring, and control across different HVAC architectures, reducing the need for system-specific controllers while maintaining adaptability through configurable interfaces.
Data Source
AI summary
An HVAC controller is provided having a plurality of control terminals for connecting to corresponding control terminals on an indoor unit for an HVAC system, at least one controller power terminal for connecting to a power terminal on the indoor unit for the HVAC system, and at least one shutoff terminal for connecting to a power terminal on a thermostat for the HVAC system, and a controllable power relay electrically coupling the shutoff terminal and the controller power terminal. Interrupting power from the power terminal on the thermostat deactivates the thermostat. The controllable power relay is closed during normal HVAC system usage and is opened for a testing process, and the shutoff terminal is the only connection between the HVAC controller and the thermostat that is not electrically coupled with the indoor unit.