Mitsubishi EAHV-P – Weekly Chiller Maintenance Procedure
Weekly maintenance checklist for Mitsubishi EAHV-P screw vapor chillers to ensure continuous performance, system reliability, and operational compliance.
General System Overview
- Thorough visual inspection for wear, corrosion, or physical damage
- Record and analyze weekly operating hours and compressor starts
- Review alarm history for recurring issues or patterns
- Check equipment room conditions and ventilation adequacy
- Verify all gauges and indicators are functioning properly
Compressor & Refrigerant System
- Inspect compressor for smooth operation, vibrations, and unusual noises
- Measure and record refrigerant pressures at various load conditions
- Check oil level and quality for contamination or discoloration
- Verify oil heater operation to prevent refrigerant migration
- Check vapor injection system pressures and temperatures
- Monitor slide valve operation through capacity range
Electrical Components
- Inspect all electrical connections for tightness and corrosion
- Check motor amperage against specifications at current load
- Verify control panel displays accurate readings and status
- Test all switches and buttons for proper operation
- Check VSD cooling fans and filters if equipped
Water Systems
- Verify chilled water flow and pressure within optimal range
- Check condenser water flow for sufficient circulation
- Inspect and clean water strainers as needed
- Check pump operation and inspect for leaks or unusual noise
- Verify water treatment chemical levels and adjust as needed
- Monitor approach temperatures for heat exchanger efficiency
Heat Exchangers
- Inspect condenser and evaporator for dirt, scale, or debris buildup
- Check approach temperatures and compare to baseline values
- Clean coils as necessary to maintain heat transfer efficiency
- Verify proper water distribution across heat exchanger surfaces
- Check for signs of tube fouling or biological growth
Safety & Protection Systems
- Test pressure sensors and verify proper operation
- Test temperature sensors and high/low alarms
- Verify emergency shutdown system functionality
- Check flow switches for proper operation and cleanliness
- Test oil pressure safety controls and alarms
Performance Monitoring
- Calculate weekly average system efficiency (kW/ton)
- Compare performance parameters with expected values
- Review energy consumption patterns and identify anomalies
- Analyze capacity utilization and load profiles
- Document vapor injection system efficiency performance
- Identify optimization opportunities for next week
Documentation & Reporting
- Complete weekly inspection log with all findings
- Update maintenance records and equipment history
- Document any corrective actions taken
- Note items requiring follow-up or monthly service
- Update preventive maintenance schedule as needed