Air compressors run hardest in summer, when high ambient temperature and heavy demand combine to raise discharge temperature. Overheating is the most common cause of summer shutdowns, and it accelerates oil and component ageing.
Why machines overheat
A compressor rejects heat through its oil cooler and aftercooler. When the ambient temperature rises, the cooling medium is warmer and less effective, so the machine runs closer to its high-temperature trip point. Dust and oil film on the cooler surfaces make the problem worse.
Preventive steps
- Clean air and oil coolers regularly with compressed air or a soft brush
- Keep the compressor room ventilated and duct hot air outside
- Check and replace intake filters to reduce load
- Use the correct viscosity and quality of cooling oil
- Verify thermostatic valves and cooling fans operate correctly
Operating adjustments
Reduce the load profile where possible by sequencing machines, and avoid running compressors beyond their rated ambient temperature. If the site regularly exceeds the design ambient, consider a water-cooled machine or a higher-capacity cooling package.