General System Overview
- Inspect for leaks, corrosion, or damage to pipes, insulation, and supports.
- Record compressor runtime and start count for the week.
- Review alarm status and historical logs from the past week.
- Check for any unusual conditions or changes since last inspection.
- Verify all access panels are secure and properly sealed.
Compressor & Refrigerant System
- Check for abnormal noise, vibration, or heat from compressor.
- Verify refrigerant suction and discharge pressures are within range.
- Oil Level:Check oil sight glass and ensure proper oil level(Oil-lubricated models only).
- Oil Heater:Confirm oil heater operation and proper standby temperature(Oil-lubricated models only).
- Check refrigerant sight glass for proper charge indication.
- Record superheat and subcooling values for trending.
Electrical System
- Check terminal tightness, corrosion, and discoloration.
- Log motor amperage and verify against specifications.
- Confirm proper operation of control panel and indicators.
- Check starter contacts for pitting or wear.
- Verify phase voltage balance within 2%.
- Test control circuit voltage and operation.
Water Circulation System
- Measure chilled and condenser water flow, pressure, and delta-T.
- Inspect pump operation, check for abnormal noise or vibration.
- Inspect cooling tower: clean basin, check float valve and fan operation.
- Verify water flow switches are functioning properly.
- Check expansion tank pressure and operation.
- Inspect piping for vibration or support issues.
Heat Exchange Components
- Inspect condenser and evaporator coils for fouling or scale.
- Log approach temperature and compare to specifications.
- Clean coils if heat transfer performance is degraded.
- Check refrigerant-to-water temperature differentials.
- Verify proper water velocity through tubes.
- Inspect tube sheets for signs of corrosion.
Water Treatment
- Verify dosing pumps are operating and chemical levels are correct.
- Test pH, hardness, and TDS levels.
- Clean strainers or replace filters as needed.
- Check blowdown operation and conductivity levels.
- Verify biocide treatment schedule is being followed.
- Inspect chemical feed tanks and refill as necessary.
Safety & Protection Systems
- Check pressure relief valves and interlocks for proper operation.
- Verify shutdowns trigger properly (temperature/pressure limits).
- Ensure emergency stop buttons and LOTO tools are accessible.
- Test flow switches and verify proper setpoints.
- Check refrigerant monitor and leak detection systems.
- Verify all safety labels are legible and in place.
Performance Monitoring
- Record kW/ton ratio and compare with efficiency goals.
- Review temperature and pressure trend logs for the week.
- Flag and escalate any significant anomalies or trends.
- Calculate weekly average efficiency and document.
- Compare current performance with seasonal baselines.
- Identify opportunities for optimization or adjustment.
Documentation
- Complete weekly checklist log with date and technician name.
- Attach trend reports or alarm summaries as needed.
- Ensure compliance with OSHA, ISO 9001, 14001, and 50001.
- Update maintenance tracking system with findings.
- Document any corrective actions taken or needed.
- Schedule follow-up actions for identified issues.