Applicable Systems
R-Series
Symptoms
The compressor discharge temperature exceeds 105C (221F), triggering a high-temperature warning alarm. The controller reduces load to prevent oil degradation.
Possible Causes
- Insufficient cooling airflow due to clogged cooler fins or blocked ventilation
- Low oil level or degraded oil reducing heat transfer efficiency
- Ambient temperature exceeding the rated 40C (104F) maximum
Troubleshooting Steps
- Step 1: Inspect the air-oil cooler for dirt buildup and clean with compressed air or solvent cleaner
Airflow through the cooler should be unobstructed; fins should show no clogging - Step 2: Check the oil level sight glass and verify oil is between the MIN and MAX marks
Add approved compressor oil if level is below MIN - Step 3: Measure the ambient temperature near the compressor intake
If above 40C, improve room ventilation or consider relocating the intake to a cooler zone
How to Reset
Reset: After the discharge temperature drops below 95C, press the Alarm Reset button on the controller. The alarm clears automatically.
Common Replacement Parts
- Air-oil cooler cleaning kit: Solvent-based foam cleaner and fin comb (Use quarterly in dusty environments)
Frequently Asked Questions
- Q: What is the maximum discharge temperature?
Most rotary screw compressors alarm at 110C and shut down at 120C. Consult the manual for specific thresholds.
- Q: Can I use automotive oil?
No. Use only ISO VG 46 synthetic compressor oil approved by the manufacturer to prevent varnish and seal damage.
Comments (0)
Share your experience to help others facing the same problem.
Leave a Comment
Source: Service Manual
Category: Compressor
No comments yet. Be the first to share your experience!