Mitsubishi EACV – Yearly Water-Cooled Chiller Maintenance Procedure
Use this yearly checklist to ensure your Mitsubishi EACV water-cooled chiller meets operational, safety, and performance standards for long-term reliability.
General System Overview
- Comprehensive inspection of all components including piping, insulation, joints, valves, and electrical systems.
- Document all visible signs of wear, leaks, or corrosion for repair planning.
- Review total operating hours and compressor starts for the year.
- Compare actual runtime with service schedules and reset service counters.
- Test all alarms under simulated fault conditions.
- Verify complete alarm system functionality including remote notifications.
Compressor & Refrigerant System
- Perform compressor overhaul inspection for wear and tear.
- Clean, lubricate, and replace compressor parts as needed.
- Check motor amperage and ensure operation within specified limits.
- Conduct comprehensive refrigerant pressure check and leak testing.
- Replace compressor oil with manufacturer-recommended grade.
- Test oil heater functionality and refrigerant migration prevention.
- Perform vibration analysis and document baseline values.
Heat Exchanger & Cooling Tower
- Deep clean condenser coils removing all scale, dirt, and debris.
- Perform eddy current testing on heat exchanger tubes.
- Verify water flow rates meet design specifications.
- Document entering and leaving temperatures for efficiency analysis.
- Complete cooling tower overhaul including fill replacement if needed.
- Service cooling tower fans, motors, and drive systems.
- Clean and inspect water distribution system completely.
Water System & Treatment
- Comprehensive water quality analysis including microbiological testing.
- Test water for pH, alkalinity, hardness, and all relevant parameters.
- Inspect and clean all water filters and strainers.
- Calibrate water treatment control systems and sensors.
- Review and optimize water treatment program effectiveness.
- Replace water treatment media and filters as required.
Electrical System
- Complete inspection of all electrical components and connections.
- Clean and test relays, circuit breakers, and fuses.
- Perform motor insulation resistance testing.
- Verify motor efficiency and compare with specifications.
- Infrared scan of all electrical connections and components.
- Verify proper voltage, current, and phase balance.
- Test and calibrate all electrical protection devices.
Safety & Protection Systems
- Comprehensive testing of all safety switches and devices.
- Calibrate pressure relief valves and verify setpoints.
- Test temperature controls and emergency shutdown systems.
- Functional test of all alarms and indicators.
- Verify refrigerant monitoring system operation.
- Update all safety documentation and certifications.
Performance Monitoring
- Comprehensive annual efficiency review and analysis.
- Compare cooling output and energy consumption against benchmarks.
- Analyze operational efficiency trends for the full year.
- Identify patterns suggesting inefficiency or degradation.
- Develop optimization recommendations to reduce operating costs.
- Calculate actual vs.
Documentation & Reporting
- Complete comprehensive annual inspection report.
- Document all maintenance activities and corrective actions.
- Update equipment history and maintenance records.
- Verify compliance with all local regulations and standards.
- Ensure environmental compliance documentation is current.
- Prepare maintenance budget recommendations for next year.