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Page 4 - Condition Based Maintenance
Page 1 - HVAC Maintenance Overview

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The HVAC system plays a major role in the overall energy consumption of buildings and represents 50%–60% of the energy used in buildings.  Maintenance of these HVAC systems accounts for more than 65% of annual facility management costs.  Effective maintenance strategies can reduce building maintenance costs and even extend the life of building components.  So, it is crucial to prepare a maintenance plan when the equipment or the machine starts to have alerts of probable future failures before it breaks down, and also, we need to make sure that we are not replacing the equipment before exploiting its fully potential lifecycle

Click on the boxes numbered below to explore the different types of HVAC maintenance in more detail:

HVAC Maintenance Services

Reactive Maintenance  

Condition Based Maintenance

Occurs when an issue is noticed or when a total breakdown / failure occurs

Includes regular and periodic (time-based) schedules or follows a factory based schedule 

Preventative Maintenance  

Measurement or observation of normal operating conditions.  Outside of these conditions , maintenance may be required.

HVAC Maintenance Services

Reactive Maintenance  

Predictive Maintenance  

Predictive maintenance, is data-driven and  indicates when maintenance is needed

Page 5 - Predictive Maintenance

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Page 1 - HVAC Maintenance Overview
Page 2 - Reactive Maintenance
Page 3 - Preventative Maintenance

Reactive (Run-to-Failure) Maintenance

Reactive maintenance is a maintenance system that responds when a failure of machinery or systems occurs.  The repairs may be handled in-house or by the manufacturer, or through a combination of in-house maintenance and the manufacture’s technicians. Unlike preventive maintenance, reaction maintenance occurs when a breakdown happens.   What's the difference between corrective maintenance and reactive maintenance?  While corrective maintenance is a proactive approach focused on rectifying identified issues, reactive maintenance is a hands-off approach until failure. 

Example of Reactive Maintenance

Reactive Maintenance  

  • A simple example of run-to-fail maintenance is allowing a light bulb to burn out before worrying about replacing it, but it can also refer to a HVAC system that simply stops running on its own after a while, as part of a normal operational process
  • Rather than stopping everything to perform preventive maintenance (and absorbing associated costs), it makes more sense to simply wait for the machine to break down on its own before performing maintenance

Examples of reactive maintenance:

Reactive Maintenance Costs 

The costs of reactive maintenance can range from minor repairs to total replacement of machinery.  Therefore, it becomes difficult to predict the cost of reactive maintenance, though occasionally the cost is offset by a warranty or service contract.  Reactive maintenance can be a beneficial plan for your business from a financial perspective, as it takes less time and and money to have equipment repaired when needed, rather than performing routine maintenance to prevent the breakdown from occurring.  It is recommended that reactive maintenance isn’t your sole maintenance strategy in place for equipment repairs, as it’s often not sustainable in the long run for valuable HVAC systems.  For essential assets, it’s a good idea to implement a mix of routine, preventive, and reactive maintenance strategies.

Benefits of Reactive Maintenance

  • Less maintenance staff, fewer employees, fewer wages paid out regularly
  • Fewer costs to implementation – no regular maintenance means no labor or part costs until failure occurs
  • Fewer management hours are needed for maintenance planning
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Preventative Maintenance

Preventive maintenance seeks out to repair minor issues in order to decrease the occurrence of major repairs.  Maintenance inspections may change based on the age of the equipment.  When it is new, the procedure may be more of a predetermined maintenance style, but as it ages, more frequent inspections, both physical and through data, may prevent minor performance issues from becoming extensive and more costly repairs.

Example of Preventative Maintenance

Preventative Maintenance  

  • Regular and routine inspections 
  • Look for wear and tear before symptoms appear

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Page 3 - Preventative Maintenance
Page 4 - Condition Based Maintenance

An excellent example of preventative maintenance is the seasonal cleaning of an HVAC unit.  In spring, you schedule maintenance to ensure that grit and sand are not inside the casing or leaves are not blocking the air intake.  There is no specific issue, but we know that leaves can accumulate throughout the seasons and cause problems later in the year.  Removing the grit or leaves prevents a later difficulty, such as poor performance, increased energy usage, etc.

Preventative Maintenance Costs 

Expect to pay more for labour under preventative maintenance, so equipment inspections occur as scheduled.  However, those added labor costs may be offset by preventing major repairs and the increase in energy consumption from machines that do not operate at peak performance.  In addition, services can be outsourced, which can help reduce the cost of labor.

Benefits of Preventative Maintenance

  • Prevention of major repairs
  • Keeps businesses open by preventing most emergency repairs
  • Helps the product’s lifecycle by reducing wear
  • Keeps energy costs at their lowest possible rates
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Page 1 - HVAC Maintenance Overview
Page 2 - Reactive Maintenance
Page 3 - Preventative Maintenance

Condition-Based Maintenance

Implementing a condition-based maintenance program for HVAC systems can offer numerous benefits:

  • Ensures optimal performance and energy efficiency of the equipment
  • Can detect potential problems early, saving you from unexpected expenses
  • Less expensive and time-consuming than preventive maintenance
  • Suitable for assets that need to run continuously, even during maintenance
  • Reduces labor by using sensor equipment and other condition monitoring tools
  • Can deliver cost savings of 10 to 40% compared with poor maintenance
  • Can extend the system’s lifespan, boost the system’s dependability, and contribute to peace of mind

Example of Condition-Based Maintenance

Condition Based  Maintenance  

  • Sensors check conditions such as vibration, temperature and pressure while the equipment is in operation
  • By analyzing the data collected by these sensors, the program can detect potential issues early and address them before they become major problems
  • For example, sound monitoring tools can detect anomalies in the sound generated by the machine before vibration or temperature monitoring tools can detect them 

Condition-based maintenance programs use condition-monitoring sensors to monitor the performance of HVAC equipment.

Condition-Based Maintenance Costs 

The overall cost of condition-based maintenance is low.  Because maintenance is scheduled when anomalies begin, the cost to correct them is less than repairing a complete failure of the machine.  The benefits of conditional-based maintenance show us more.

Benefits of Condition-Based Maintenance

  • Less downtime
  • Decreased energy consumption
  • Greater productivity — the equipment runs in the range of peak performance for longer
  • Fewer complete failures as equipment maintenance occur as the performance drops
Page 5 - Predictive Maintenance

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Predictive Maintenance

Predictive maintenance is an innovative approach that evaluates potential issues that may arise with HVAC equipment and systems before they occur.  It guides when technicians should perform maintenance tasks to avoid breakdowns and disruptions, as well as extend the life of the machinery.  What is the difference between predictive maintenance and condition-based maintenance?  Predictive maintenance primarily makes use of sensor data to predict when maintenance is required.  Condition-based maintenance likewise uses sensors, but it can only warn you when your equipment begins to require servicing.  Predicted failure scenarios initiate predictive maintenance, whereas an asset’s exact status initiates condition-based maintenance.

Example of Predictive Maintenance

Predictive Maintenance  

  • IoT sensors are installed on the system, to check vibration, acoustic, temperature, pressure, flow rate, CO2 concentration and many other sensors that depend on the type of equipment and the type of anomaly or the failure that we desire to predict
  • Data is collected and stored in an existing database, then cleaned and classified
  • After that, the essential step is the selection and the programming of the most adequate prediction model and maintenance schedule plan. The most difficult part of the application of a predictive maintenance plan is related to the programming of the predictive model.  This is due to a large amount of the existing models that differ from one model to another with the accuracy of the predicting results or the complexity of the datasets training

Examples of Predictive Maintenance may include the following steps:

Predictive Maintenance Costs 

Although initial set-up costs for predictive maintenance are high according to a study by McKinsey & Company, predictive maintenance can reduce HVAC maintenance costs by up to 30%.   A report by Grand View Research predicts that the global predictive maintenance market will reach $201 billion by 2025, driven by the increasing adoption of IoT-based predictive maintenance solutions.

Benefits of Predictive Maintenance

  • Cuts the cost of maintenance by a rate ranging from 25% to 35%
  • Defeat breakdowns by a rate of 70% to 75%
  • Decrease the time of breakdowns with a rate of 35% to 45%
  • Boost the production with a rate ranging from 25% to 35%
Page 4 - Condition Based Maintenance
Page 1 - HVAC Maintenance Overview
Page 2 - Reactive Maintenance
Page 3 - Preventative Maintenance
Page 5 - Predictive Maintenance