Mitsubishi EACV – Monthly Chiller Maintenance Procedure
Use this checklist for monthly maintenance of Mitsubishi EACV centrifugal chillers to ensure safety, energy efficiency, and reliable operation.
General System Overview
- Perform thorough inspection of entire chiller system for leaks, corrosion, cracks, or physical damage
- Inspect piping, insulation, and support structures for integrity
- Check operating hours and verify equipment is within monthly service intervals
- Review complete alarm history for recurring issues or patterns
- Verify all monitoring systems are functioning correctly
- Document equipment condition with photographs where applicable
Compressor & Refrigerant System
- Inspect compressor for wear and tear, listen for abnormal sounds (grinding, rattling)
- Check refrigerant pressure levels against manufacturer specifications
- Perform comprehensive leak detection using electronic leak detector
- Take oil sample for laboratory analysis
- Inspect and replace compressor oil if contaminated or degraded
- Test oil heater functionality and temperature regulation
- Verify proper operation of oil pump and oil pressure
- Check compressor vibration levels and compare to baseline
Electrical System
- Confirm correct voltage, amperage, and frequency per specifications
- Inspect all electrical connections, tighten as necessary
- Check control panels, circuit breakers, and safety switches for damage or wear
- Test motor insulation resistance
- Verify proper motor lubrication and bearing condition
- Check fan operation and ensure unobstructed air circulation
- Perform thermographic scan of electrical components
- Test ground fault protection systems
Water & Cooling System
- Check chilled water flow rate, pressure, and temperature differential
- Verify pumps and valves are functioning optimally
- Inspect condenser water flow rate and temperature parameters
- Test water treatment system and chemical levels
- Clean water strainers and filters
- Check for scaling, fouling, or biological growth
- Verify proper operation of water flow switches
- Test and calibrate water temperature sensors
Heat Exchangers
- Perform visual inspection for fouling or scaling on condenser and evaporator
- Clean coils thoroughly as required
- Inspect airflow through heat exchangers
- Clean fans and remove debris blocking airflow
- Check tube bundle condition for corrosion or damage
- Verify heat transfer efficiency through approach temperature analysis
- Inspect and clean refrigerant distribution system
Safety & Protection Systems
- Test all high/low pressure safety switches
- Verify temperature sensors and limit switches
- Perform full emergency shutdown system test
- Test refrigerant leak detection systems
- Verify proper operation of all relief valves
- Check and update safety signage and labels
- Review and update emergency procedures documentation
Performance Monitoring
- Assess system efficiency by comparing operational parameters with historical data
- Review monthly energy consumption trends
- Calculate current kW/ton efficiency
- Identify optimization opportunities
- Verify capacity control system operation
- Review and adjust operating setpoints as needed
- Generate monthly performance report
Control System & Calibration
- Back up all control system parameters and settings
- Calibrate temperature sensors and transducers
- Calibrate pressure sensors and switches
- Test and verify control sequence operations
- Update control software if newer versions available
- Clean control panel and check display functionality
Documentation & Reporting
- Record all inspection findings and maintenance actions in detail
- Update equipment maintenance log with current data
- Document any issues addressed and parts replaced
- Verify compliance with environmental and safety regulations
- Generate monthly maintenance report for management
- Schedule follow-up maintenance as required