HVAC Preventive Maintenance Scheduling Based on Runtime Data

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Solution Overview

Problem

HVAC units require regular preventive maintenance, but existing manual scheduling methods often result in unnecessary maintenance for infrequently used units or insufficient maintenance for frequently used units, leading to excessive costs and potential damage.

Innovation Solution

A control system that monitors runtime data for HVAC units, automates the scheduling of preventive maintenance visits, and initiates hot-cold tests post-maintenance without human interaction, ensuring timely and efficient maintenance based on actual usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If preventive maintenance is performed on a calendar basis (e.g., every quarter or twice a year), then HVAC units receive regular maintenance attention, but infrequently used units receive unnecessary maintenance while frequently used units may not receive sufficient maintenance

Engineering Contradiction:

Improvemaintenance timing accuracyVSAvoidfinancial expenditure

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The system transitions from static calendar-based scheduling to dynamic runtime-based scheduling. The control system continuously monitors HVAC unit runtime and automatically adjusts maintenance scheduling based on actual usage patterns, ensuring maintenance is performed based on real operational needs rather than fixed time intervals

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements feedback loops where runtime data from HVAC units is continuously collected and analyzed. This feedback enables the control system to make informed decisions about when maintenance is actually needed, creating a closed-loop system that adapts to actual usage patterns and optimizes maintenance timing

Inventive Principle:

Principle #23Feedback

2Ease of operation

If manual preventive maintenance scheduling is used, then technicians can perform maintenance visits, but the process requires excessive human interaction and cannot adapt to actual usage patterns

Engineering Contradiction:

Improvemaintenance scheduling automationVSAvoidsystem automation level

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The system enables self-service automation where the control system autonomously monitors runtime data, determines when maintenance is needed, schedules service visits, and even initiates post-maintenance testing without human intervention. The system serves itself by making intelligent decisions based on collected data

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces manual mechanical scheduling processes with automated electronic control. The control system uses software algorithms to analyze runtime data and generate maintenance schedules, substituting human decision-making with automated computational processes

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS11530835B2System for preventive maintenance of HVAC units

Publication Date: 2022.12.20 SIEMENS INDUSTRY INC

AI summary

There is described a system and method of a building management system for preventive maintenance of an HVAC unit. Runtime data of the HVAC unit is received at a control system remote from the HVAC unit. A service message is initiated, by the control system, to a service device associated with the HVAC unit in response to determining that a preventive maintenance visit is warranted based on the runtime data. A hot-cold test for the HVAC unit is activated by the control system in response to receiving the registration message of the preventive maintenance visit from the service device. A validation message is reported in response to validating the preventive maintenance visit based on a result of the hot-cold test for the HVAC unit.