• The following tasks are usually performed annually during a shutdown period in order to properly evaulate the chiller status.
• Record the operating data, noting general conditions and other applicable information.
• Review the chiller operating history and past operating reports so that the service personnel can properly evaluate the condition.
• Performing mechanical cleaning of condenser and evaporator tubes, including end cover gasket or 'O' ring replacement.
• Replacement of compressor oil (if necessary) and oil filter.
• Replacement of filter drier and purge drier (if applicable).
• Checking of controls and safety devices for proper operation.
• Insulation testing of motor.
• Visual check for any leakages.
• Checking of electrical connections, switches, contactors, relays etc. for tightness and proper operation.
• Checking of pressure and temperature gauges, sensors and transducers for proper operation.

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• This method is applied in inspection of heat exchangers tubes.
• ECT method detects pits, wall loss and cracks in tubes which will enable user to schedule for repairs during downtime or annual maintenance.
• Mostly used for non-ferromagnetic tubing like copper-nickel alloy, stainless steel and titanium.

• Oil analysis reports will help to analyse wear metals, oil and water patterns, and proper maintenance programmes can be put in place for improved performance.
• Oil sample information (when and where it was taken)
• Wear metals measured (copper, iron, lead, chromium etc)
• Additives measured (zinc, magnesium etc)
• Contaminates (water, silicon)
• Oil properties (viscosity, SAE/ISO)

• Vibration analysis allows user to evaluate the conditions of the equipment and avoid failures.
• It is usually used to determine failures not restricting to:
  1) Defective foundation
  2) Coupling misalignment
  3) Mechanical looseness
  4) Excess bearing to shaft clearance
  5) Bent shaft