Daikin WDC Monthly Chiller Maintenance Procedure

Perform thorough visual inspection of entire chiller system for leaks, corrosion, cracks, or physical damage
Inspect piping, insulation, and support structures for integrity and proper condition
Check operating hours log and verify equipment is within expected monthly service intervals
Review alarm history for recurring issues and document all findings
Verify all alarm and monitoring systems are functioning correctly
Check equipment room conditions including temperature, humidity, and ventilation

Inspect compressor for wear and tear, listening for abnormal sounds like grinding or rattling
Check refrigerant pressure levels and verify against manufacturer specifications
Perform comprehensive leak detection using electronic detectors and bubble tests
Inspect compressor oil and perform oil analysis for contamination or degradation
Replace compressor oil if analysis indicates contamination or breakdown
Test oil heater functionality and verify temperature regulation capabilities
Check inlet guide vane operation and calibration
Document refrigerant charge and any additions or recoveries performed

Confirm chiller receiving correct voltage, amperage, and frequency per specifications
Inspect all electrical connections, control panels, and circuit breakers for damage or wear
Check for signs of overheating, corrosion, or loose connections
Test safety switches and verify proper operation
Inspect motor insulation resistance and record readings
Check motor performance, lubrication, and bearing condition
Verify fans functioning properly with unobstructed air circulation
Perform thermographic scan of electrical components if available

Check chilled water flow rate, pressure, and temperature against design parameters
Verify pumps and valves functioning optimally with no cavitation or excessive noise
Inspect condenser water flow rate and temperature within normal operating parameters
Verify water treatment systems working properly to prevent scaling and corrosion
Test water chemistry including pH, conductivity, and inhibitor levels
Clean water strainers and check differential pressure across filters
Inspect expansion tanks and air separators for proper operation
Check for proper water flow through all circuits and document flow rates

Perform visual inspection for fouling or scaling on condenser and evaporator surfaces
Clean coils as required using approved cleaning methods and chemicals
Inspect airflow through heat exchangers and verify no debris blocking flow
Clean fans and ensure proper rotation and balance
Check approach temperatures and log values for trending
Inspect tube sheets and end bells for corrosion or damage
Verify proper refrigerant subcooling and superheat values

Assess system efficiency by comparing operational parameters with historical data
Review monthly energy usage trends and calculate kW/ton efficiency
Analyze cooling output versus energy consumption for optimization opportunities
Compare actual performance with manufacturer design specifications
Document capacity control response to varying load conditions
Review and update control setpoints for seasonal optimization
Perform vibration analysis on rotating equipment