HVAC Runtime Monitoring for Preventive Maintenance Validation
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Solution Overview
Problem
Existing HVAC units require costly and inefficient manual preventive maintenance scheduling, leading to unnecessary maintenance for infrequently used units and insufficient maintenance for frequently used units.
Innovation Solution
A control system that monitors runtime data to determine when preventive maintenance is needed, sends automated service messages to technicians, performs hot-cold tests post-maintenance, and reports validation messages to confirm proper execution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If preventive maintenance is performed on a calendar basis for all HVAC units, then maintenance coverage is ensured, but unnecessary maintenance costs are incurred for infrequently used units
Solution Approach 1:
The system performs preliminary monitoring of runtime data before scheduling maintenance. The control system accumulates runtime information from sensors and only triggers maintenance scheduling when predetermined thresholds are exceeded, preventing unnecessary calendar-based maintenance visits while ensuring timely service when actually needed
Solution Approach 2:
The maintenance schedule is made dynamic rather than static. Instead of fixed calendar intervals, the system continuously monitors runtime data and adjusts maintenance timing based on actual usage patterns, allowing the maintenance interval to adapt to each unit's operational characteristics
2Ease of manufacture
If preventive maintenance is performed on a calendar basis for all HVAC units, then standardization is maintained, but insufficient maintenance occurs for frequently used units
Solution Approach 1:
The system replaces static calendar schedules with dynamic runtime-based scheduling. Sensors continuously monitor operational hours and the control system automatically adjusts maintenance timing based on actual usage, ensuring that frequently used units receive maintenance more often while maintaining a standardized automated process across all units
Solution Approach 2:
The system implements feedback loops where runtime data from sensors is continuously fed back to the control system. This feedback mechanism allows the system to learn from actual usage patterns and automatically adjust maintenance scheduling, ensuring adequate maintenance for high-usage units while maintaining process standardization through automated decision-making
3Ease of operation
If manual preventive maintenance scheduling is used, then flexibility in scheduling is maintained, but automation and efficiency are reduced
Solution Approach 1:
The system enables self-service automation where the control system autonomously monitors runtime data, determines when maintenance is needed, and schedules service visits without manual intervention. This eliminates the need for human operators to manually track and schedule maintenance while maintaining the flexibility to adapt to actual usage patterns
Solution Approach 2:
The patent replaces manual mechanical scheduling processes with automated electronic monitoring and control systems. Sensors, communication networks, and control algorithms substitute for human operators, automatically tracking runtime and generating maintenance schedules, thereby improving efficiency while preserving scheduling flexibility through programmable logic
Data Source
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AI summary
There is described a system and method of a building management system (140, 200) for preventive maintenance of an HVAC unit (212d). Runtime data of the HVAC unit is received at a control system (100) remote from the HVAC unit (304). A service message is initiated, by the control system, to a service device associated with the HVAC unit (316) in response to determining that a preventive maintenance visit is warranted based on the runtime data (310). A hot-cold test for the HVAC unit is activated by the control system (322) in response to receiving the registration message of the preventive maintenance visit from the service device (318). A validation message is reported (326) in response to validating the preventive maintenance visit based on a result of the hot-cold test for the HVAC unit.