HVAC Chillers Maintenance Types

Types of Maintenance (For HVAC Equipment)
First: Proactive types of maintenance (Before the Breakdown)
Preventive maintenance (PMs)
Predictive maintenance
Condition-based maintenance
Scheduled maintenance
Planned maintenance
Routine maintenance

Second: Reactive types of maintenance (After the Breakdown)
Emergency maintenance
Corrective maintenance

 Preventive maintenance (PMs),
Preventive maintenance is the most popular type of proactive maintenance. To start conducting preventive maintenance tasks (PMs), an organization does not need to purchase new technology if it already has a CMMS(Computerized maintenance management system).
What Is Preventive Maintenance?

Preventive maintenance (PM) is a type of proactive maintenance that includes adjustments, cleaning, lubrication, repairs, and parts replacements. PM aims to keep assets in good order and reduces unscheduled shutdowns and sudden major repairs.
The goal of preventive maintenance, also spelled preventative maintenance, is to increase asset lifetime by preventing excess depreciation and impairment or untimely breakdown. This maintenance includes, but is not limited to, adjustments, cleaning, lubrication, repairs, and parts replacements. Due to the unique needs of different assets, the type and amount of preventive maintenance required varies. Because of this, it can be challenging to establish a successful preventive maintenance program. However, a good rule of thumb is to start with a time-based preventive maintenance program.
Types of Preventive Maintenance
Any maintenance that is not reactive maintenance is preventive maintenance. And there are many different types of preventive maintenance that require different types of technology and expertise. Two common types of preventive maintenance include:
1. Calendar-Based Maintenance: A recurring work order is scheduled for when a specified time interval is reached in the computerized maintenance management system (CMMS).
2. Usage-Based Maintenance: Meter readings are used and logged in the CMMS. When a specific unit is reached, a work order is created for routine maintenance.

 Predictive maintenance
Predictive maintenance (PdM) is what savvy maintenance teams aspire to have or are already implementing.
What is predictive maintenance?

Predictive maintenance (PdM) is a type of condition-based maintenance that monitors the condition of assets using sensor devices. These sensor devices supply data in real-time, which is used to predict when the asset will require maintenance and prevent equipment failure.
Predictive maintenance workflow
1. Establish baselines
The maintenance team establishes acceptable condition limits for assets that will have sensors.
2. Install Internet of Things (IoT) devices
The relevant sensor is affixed to the asset. For instance, a vibration meter is affixed to a mechanical asset with gears and a temperature sensor is attached to a boiler.
3. Connect devices to software
The IoT device is connected to a CMMS or remote dashboard where data is collected and analyzed.
4. Schedule maintenance
Inspections are automatically triggered by a CMMS when the condition limit is exceeded or the person monitoring the dashboard schedules the inspection manually.

 Condition-based maintenance
Condition-based maintenance (CBM) is at the core of predictive maintenance but, on its own, does not rely on technology to determine the condition of an asset like PdM does.
What is condition-based maintenance?
Condition-based maintenance (CBM) uses sensor devices to collect real-time measurements (ie. pressure, temperature, or vibration) on a piece of equipment. CBM data allows maintenance personnel to perform maintenance at the exact moment it is needed, prior to failure.
• 79% of businesses see predictive maintenance as the main application of industrial data analytics
• 10% (and maybe even less) of industrial equipment ever actually wears out, meaning a very large portion of mechanical failures are avoidable
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