Daikin WLPB – Monthly Chiller Maintenance Procedure
Use this checklist for monthly maintenance of Daikin WLPB vapor absorption chillers to ensure efficient, safe, and sustainable operation.
Comprehensive System Inspection
- Thorough visual inspection of entire chiller system including insulation integrity
- Check all flanges, valves, and connections for leaks using soap solution
- Inspect structural supports and vibration isolators for deterioration
- Verify operating hours log and compare with maintenance schedule
- Test all local and remote alarm systems for proper function
- Review and update equipment documentation and drawings
Solution Analysis & Management
- Perform complete lithium bromide solution analysis with laboratory equipment
- Measure and record specific gravity at multiple temperature points
- Check solution pH and adjust if outside 9.
- Verify corrosion inhibitor levels and add as necessary
- Calculate crystallization margin at current operating conditions
- Clean solution pump strainers and check for debris
Heat Exchanger Performance
- Calculate and trend approach temperatures for all heat exchangers
- Inspect tube sheets for signs of erosion or corrosion
- Check absorber and condenser spray nozzles for proper pattern
- Verify evaporator refrigerant level and distribution
- Clean accessible heat transfer surfaces if fouling detected
- Document heat transfer efficiency for trending analysis
Electrical System Verification
- Inspect and tighten all electrical connections with torque wrench
- Check motor amperage draw and compare to nameplate ratings
- Verify proper operation of variable frequency drives if equipped
- Test insulation resistance on motors with megohmmeter
- Inspect control panel for signs of overheating or component wear
- Verify proper grounding of all electrical components
Vacuum System Analysis
- Perform detailed vacuum leak test using helium leak detector
- Change vacuum pump oil and inspect for contamination
- Test purge unit efficiency and adjust operating parameters
- Inspect all gaskets and O-rings for deterioration
- Verify rupture disk integrity with pressure test
- Document vacuum trends and purge frequency for analysis
Water System Maintenance
- Perform complete water analysis for pH, hardness, and dissolved solids
- Clean water strainers and inspect for debris accumulation
- Verify water treatment chemical feed rates and adjust as needed
- Check flow rates and pressure drops across all water circuits
- Inspect cooling tower fill and drift eliminators if applicable
- Document water usage and blowdown rates for efficiency tracking
Control System Calibration
- Calibrate all temperature sensors using certified thermometer
- Verify pressure transducer accuracy with test gauge
- Test and adjust control valve actuators for proper stroke
- Update control system software and firmware if available
- Verify setpoints and control logic for optimal efficiency
- Document all calibration results for compliance records
Safety Systems Testing
- Test crystallization protection system with simulated conditions
- Verify emergency dilution cycle completes within time limits
- Test all safety interlocks and document response times
- Inspect and test pressure relief devices for proper operation
- Verify emergency shutdown procedures with operators
- Update safety documentation and emergency contact information
Performance Analysis
- Calculate monthly average COP and compare to baseline
- Analyze heat source consumption trends and costs
- Review capacity utilization and load profile data
- Compare actual performance to manufacturer specifications
- Identify efficiency improvement opportunities
- Generate monthly performance report for management review