Daikin WHT – Yearly Chiller Maintenance Procedure
Use this detailed checklist to perform yearly maintenance on Daikin WHT vapor absorption chillers to ensure compliance, reliability, and optimal system performance.
Comprehensive System Evaluation
- Complete detailed inspection of all components including vessels, piping, valves, and structural supports
- Document all wear patterns, corrosion, or degradation with detailed photographs
- Review annual operating logs and identify any recurring issues or trends
- Perform vibration analysis on all rotating equipment
- Update equipment condition assessment and remaining life estimates
- Reset all service counters and update maintenance schedules
Solution System Overhaul
- Perform complete solution analysis including metals content and contamination
- Replace lithium bromide solution if contaminated or degraded
- Clean solution pumps and replace mechanical seals
- Inspect and clean all solution piping and valves
- Replace solution filter elements and clean housings
- Verify proper inhibitor levels and add as required
Heat Exchanger Deep Service
- Perform eddy current testing on all heat exchanger tubes
- Mechanically clean all tube bundles using appropriate methods
- Inspect tube sheets for erosion, corrosion, or damage
- Replace water box gaskets and inspect covers
- Clean and inspect spray headers and eliminators
- Document heat transfer efficiency before and after cleaning
Vacuum System Rebuild
- Complete purge pump overhaul including seal replacement
- Replace all system gaskets and o-rings
- Perform comprehensive helium leak detection test
- Calibrate all vacuum gauges with certified instruments
- Test and rebuild vacuum breaker valves
- Document vacuum decay rate after all repairs
Electrical System Overhaul
- Perform thermographic inspection of all electrical components
- Megohmeter test all motor windings and record insulation resistance
- Replace motor bearings based on runtime or vibration analysis
- Clean and test all electrical contacts and connections
- Calibrate all electrical protection devices
- Update electrical single-line drawings with any modifications
Control System Modernization
- Install latest control system software updates and patches
- Replace all temperature and pressure sensors per calibration history
- Rebuild or replace all control valves and actuators
- Update control strategies based on operational experience
- Implement any available energy optimization features
- Train operators on any new control features
Water System Service
- Inspect and clean all water pumps, replace seals as needed
- Replace all water strainer elements and gaskets
- Perform complete water system chemical cleaning if required
- Calibrate all flow meters and pressure gauges
- Update water treatment program based on annual water analysis
- Inspect and service isolation valves throughout system
Safety Systems Certification
- Test and certify all pressure relief valves per ASME requirements
- Perform complete functional test of all safety interlocks
- Update emergency response procedures and contact information
- Conduct emergency shutdown drills with operations staff
- Verify compliance with all applicable safety codes and standards
- Complete annual lockout/tagout procedure review and training
Performance Analysis & Optimization
- Conduct full load performance test and calculate annual efficiency
- Analyze energy consumption trends and identify savings opportunities
- Compare performance with industry benchmarks and similar facilities
- Develop action plan for performance improvements
- Calculate return on investment for recommended upgrades
- Prepare comprehensive annual performance report for management