Daikin WRC – Weekly Chiller Maintenance Procedure
Use this checklist to perform weekly maintenance on Daikin WRC vapor absorption chillers for optimal reliability, water chemistry, and system safety.
System Overview & Trend Analysis
- Review daily logs from past week for abnormal patterns or recurring issues
- Inspect chiller and equipment room for leaks, damage, or unusual conditions
- Verify total operating hours align with expected runtime and load profile
- Test all alarms for proper function and audibility throughout equipment room
- Check equipment accessibility and ensure clear pathways for emergency access
- Document any changes in operating conditions or performance since last week
Solution System Inspection
- Measure lithium bromide concentration and compare with optimal range
- Check solution levels in absorber and generator sumps for proper operation
- Inspect solution pumps for smooth operation, vibration, and seal integrity
- Verify solution flow indicators showing proper circulation rates
- Check for crystallization indicators at typical problem areas
- Document solution temperature differentials across heat exchangers
Water Treatment & Quality
- Test cooling water pH, conductivity, and treatment chemical levels
- Verify chemical feed systems operating properly with adequate supply
- Check blowdown system operation and adjust as needed
- Inspect strainers and clean if pressure drop exceeds limits
- Test chilled water system for proper treatment levels
- Document all water test results and chemical additions
Heat Transfer Performance
- Record approach temperatures for condenser and absorber
- Check heat exchanger performance against baseline values
- Inspect spray nozzles for proper pattern and distribution
- Verify eliminator pads are clean and functioning properly
- Monitor steam/hot water consumption for efficiency trends
- Schedule tube cleaning if approach temperatures exceed limits
Vacuum & Purge System
- Record system vacuum levels and compare with specifications
- Monitor purge unit runtime and frequency over past week
- Check purge storage tank level and drain if necessary
- Inspect visible gaskets and seals for potential leak points
- Verify vacuum pump oil level and condition
- Document purge trends to identify increasing air infiltration
Control System & Sensors
- Verify control display readings match field instrument values
- Check control valve operation and response to load changes
- Test temperature and pressure sensor accuracy with portable instruments
- Review control system event log for abnormal occurrences
- Verify setpoints appropriate for current operating conditions
- Clean control panel filters and check cooling fan operation
Electrical & Mechanical Systems
- Check motor amperage draw and compare with nameplate ratings
- Inspect electrical connections for signs of overheating or corrosion
- Verify proper motor ventilation and clean air intake screens
- Check pump alignment and coupling condition visually
- Listen for unusual vibrations or noises from rotating equipment
- Inspect motor bearings for proper lubrication schedule compliance
Safety Systems Testing
- Test high/low pressure safety switches for proper operation
- Verify temperature limit controls functioning correctly
- Test flow switches in chilled and cooling water circuits
- Check crystallization protection system ready for operation
- Verify emergency stop buttons accessible and functional
- Test refrigerant and water leak detection systems
Performance & Documentation
- Calculate weekly average COP and compare with design
- Review energy consumption patterns for optimization opportunities
- Update maintenance log with all inspection findings
- Document any maintenance performed and parts replaced
- Create work orders for issues requiring follow-up action
- Review upcoming maintenance schedule and order necessary parts