Mitsubishi EACV – Monthly Water-Cooled Chiller Maintenance Procedure
Use this checklist for monthly maintenance of Mitsubishi EACV water-cooled chillers to ensure reliability, efficiency, and safety compliance.
General System Overview
- Comprehensive inspection of entire chiller system for leaks, visible wear, or corrosion
- Inspect all pipes, joints, insulation, and support structures for integrity
- Record total operating hours and compressor starts for the month
- Compare operating hours with service schedule requirements
- Test all alarms (temperature, pressure, low water flow) for functionality
- Verify alarm audibility and proper notification systems
Compressor & Refrigerant System
- Inspect compressors for smooth operation and unusual vibrations
- Verify motor amperage matches manufacturer specifications
- Measure and record refrigerant pressures at all key points
- Perform comprehensive leak detection using electronic methods
- Check oil levels and analyze oil quality for contamination
- Replace oil if analysis indicates degradation or contamination
Heat Exchanger & Cooling Tower
- Thoroughly inspect condenser coils and clean to remove all debris
- Verify heat exchange efficiency meets design specifications
- Measure and document water flow rates through condenser
- Record entering and leaving water temperatures for trending
- Deep clean cooling tower including basin, fill, and distribution system
- Inspect and clean cooling tower fans and verify motor operation
- Check for biological growth and treat as necessary
Water System & Treatment
- Verify proper water circulation and pressure throughout system
- Inspect all water pumps for leaks, unusual sounds, or vibration
- Verify water treatment chemical dosing rates and adjust as needed
- Monitor water quality for scale buildup and corrosion prevention
- Perform comprehensive water testing including pH, alkalinity, hardness
- Address any chemical imbalances identified in water analysis
Electrical System
- Comprehensive inspection of all electrical connections for corrosion or wear
- Tighten all loose terminals and replace worn connections
- Test all fuses, circuit breakers, and relays for proper operation
- Inspect motor windings and fan blades for wear or damage
- Verify control panel displays and calibrate if necessary
- Document and clear any error codes present in system
Safety & Protection Systems
- Test all pressure relief valves for proper operation and reset
- Verify valves are not obstructed and move freely
- Test emergency shutdown system under simulated fault conditions
- Verify high-pressure cutoff operates at correct setpoint
- Verify low-pressure cutoff operates at correct setpoint
- Update all safety labels and verify emergency procedures posted
Performance Monitoring
- Analyze monthly operating parameters for efficiency trends
- Calculate actual kW/ton and compare with design specifications
- Review temperature and pressure data for abnormal patterns
- Compare current month data with historical performance
- Document energy consumption trends and identify inefficiencies
- Generate performance report with recommendations for optimization
Documentation & Reporting
- Complete monthly maintenance log with all inspection findings
- Document all corrective actions taken and parts replaced
- Summarize system performance for monthly management report
- Update water treatment logs with monthly analysis results
- Verify compliance with ISO 14001 environmental standards
- Confirm adherence to OSHA safety regulations and document