Chiller Maintenance Checklist
Preventive maintenance schedule for commercial chillers
Daily Checks
| Item | Action | Normal Range |
|---|
| Chilled water supply temp | Verify setpoint is being met | 42-45 F |
| Compressor oil level | Check sight glass | Between marks |
| Refrigerant pressures | Read suction/discharge gauges | Per PT chart |
| Chiller operating log | Record all readings | - |
| Unusual noise/vibration | Listen and inspect | None |
| Alarm history | Check controller for active alarms | No active alarms |
Weekly Checks
| Item | Action |
|---|
| Condenser coil inspection | Visually inspect for fouling, clean if needed |
| Cooling tower water (water-cooled) | Check treatment levels, blowdown if needed |
| Electrical connections | Visual inspection for loose/discolored connections |
| Refrigerant leak check | Inspect with electronic leak detector |
| Water filter/strainer | Clean or replace Y-strainer baskets |
Monthly Checks
| Item | Action |
|---|
| Oil analysis | Send sample to lab for moisture/acid content |
| Refrigerant moisture indicator | Check sight glass color |
| Compressor motor current | Measure all three phases, check balance |
| Condenser approach temperature | Compare refrigerant temp to water/air temp |
| Superheat and subcooling | Calculate and log |
Annual Maintenance
| Item | Action |
|---|
| Tube cleaning (water-cooled) | Brush clean evaporator and condenser tubes |
| Coil cleaning (air-cooled) | Chemical clean condenser coils |
| Oil and filter change | Replace oil and filter per OEM schedule |
| Refrigerant charge | Verify subcooling/superheat, adjust if needed |
| Safety device testing | Test all safety switches and alarms |
| Controls calibration | Calibrate sensors per OEM procedure |
| Electrical inspection | Torque all connections, check contactors |
| Vibration analysis | Perform on compressor and pumps |
Disclaimer: This maintenance checklist is for reference only. Always follow OEM recommended maintenance schedules and procedures.