A chiller preventive maintenance schedule lists the checks and jobs done on the equipment at fixed intervals, how long each takes, and in what order of frequency, so problems are found before the chiller fails. This page gives the schedule used in the PlantOps360 task library for chiller (water-cooled), which follows common industry practice for general-purpose equipment. It is also searched for as water cooled chiller, screw chiller, centrifugal chiller, chilled water plant.
The maker’s manual and your site safety procedures always come first where they differ. Intervals set by law differ by state.
Chiller preventive maintenance schedule and checklist
| How often | Task | Estimated time |
|---|---|---|
| Daily | Record pressures, temperatures and approach readings | 10 min |
| Weekly | Check for refrigerant or oil leaks and unusual noise | 15 min |
| Monthly | Check condenser water treatment and strainers | 30 min |
| Quarterly | Inspect electrical connections, starters and controls | 60 min |
| Half-yearly | Oil analysis and refrigerant charge check | 60 min |
| Annual | Clean condenser tubes; inspect evaporator | 480 min |
Chiller maintenance frequency and yearly workload
At the estimated times, one chiller needs about 94 hours of preventive maintenance a year. The biggest single job is “Clean condenser tubes; inspect evaporator” at 480 minutes, done annual. Multiply by the number of units you have to see the workload for your plant.
| Frequency | Tasks | Time per round | Hours per year |
|---|---|---|---|
| Daily | 1 | 10 min | 60.8 h |
| Weekly | 1 | 15 min | 13.0 h |
| Monthly | 1 | 30 min | 6.0 h |
| Quarterly | 1 | 60 min | 4.0 h |
| Half-yearly | 1 | 60 min | 2.0 h |
| Annual | 1 | 480 min | 8.0 h |
What goes wrong on a chiller without preventive maintenance
- Condenser tube fouling
- Low refrigerant charge or leaks
- Compressor oil and bearing problems
- Flow switch and control faults
What to watch between services
- Evaporator and condenser approach temperatures
- Refrigerant pressures
- Oil level and pressure
Safety and statutory notes for chiller maintenance
Refrigerant handling needs a trained person. Record any top-up as an indicator of leaks.
Where a chiller preventive maintenance schedule is used
A chiller is found in almost every industry. The industry guides below show how it fits into the wider schedule of each one:
- Preventive maintenance schedule for pharmaceutical plants
- Preventive maintenance schedule for food, dairy and beverage plants
- Preventive maintenance schedule for automotive plants
- Preventive maintenance schedule for chemical, fertiliser and petrochemical plants
- Preventive maintenance schedule for cement, glass, ceramics and building materials plants
- Preventive maintenance schedule for steel, foundry, forging and metal plants
- Preventive maintenance schedule for textile and garment mills
- Preventive maintenance schedule for thermal and hydro power plants
See all industry preventive maintenance schedules.
Related equipment maintenance schedules
- Air-cooled chiller preventive maintenance schedule
- Cooling tower preventive maintenance schedule
- Air handling unit preventive maintenance schedule
- Fan coil unit, split AC preventive maintenance schedule
- Variable refrigerant flow system preventive maintenance schedule
- Cold room preventive maintenance schedule
- Ammonia refrigeration plant preventive maintenance schedule
- Desiccant dehumidifier preventive maintenance schedule
Browse the full list of equipment preventive maintenance schedules (317 types).
Run this chiller schedule in maintenance software
In preventive maintenance software, each row above becomes a recurring task on the asset with its checklist, time estimate and parts. Tasks can be triggered by calendar date, running hours, meter readings or production cycles, each completed task is recorded with the person and date, and a failed check can open a work order. For the method behind it, read the guide to the preventive maintenance schedule, or use the free generator to get a 12-month plan for your whole equipment list.
Build my preventive maintenance schedule (free Excel)
Frequently asked questions
How often should a chiller be serviced?
In our schedule a chiller has 6 tasks: 1 daily, 1 weekly, 1 monthly, 1 quarterly, 1 half-yearly, 1 annual. The biggest job is “Clean condenser tubes; inspect evaporator”, which is done annual. Always follow the maker’s manual where it gives a different interval.
What is included in chiller preventive maintenance?
It covers routine checks and jobs such as “Record pressures, temperatures and approach readings”, “Check for refrigerant or oil leaks and unusual noise”, “Check condenser water treatment and strainers”, up to the annual overhaul or inspection. The full list with times is in the table above.
How many hours of maintenance does a chiller need per year?
About 94 hours per unit per year at the estimated times in our library, including the daily checks done every day. Use it to plan workload, not as a benchmark.
Is there a free chiller maintenance checklist?
Yes. The table on this page is a ready checklist. The free preventive maintenance schedule generator turns it into a 12-month Excel schedule for your list of equipment, with monthly workload hours.