Applicable Systems
QSI/QGV Series
Symptoms
The oil separator differential pressure has reached 0.8 bar (11.6 psi), approaching the replacement threshold. The controller displays a service reminder.
Possible Causes
- Separator element saturated with oil carryover after extended service interval
- Excessive oil in the air system causing rapid separator clogging
- Wrong oil type causing foaming and increased carryover
Troubleshooting Steps
- Step 1: Check the service hours on the controller against the separator replacement interval
Replace the separator if hours exceed 4000 or the differential alarm is active - Step 2: Inspect the oil for excessive foaming by viewing the sight glass during operation
Replace oil with the correct grade if foaming is visible - Step 3: Measure the oil carryover rate using the waste air test
Acceptable carryover is 3-5 ppm; higher rates indicate separator failure
How to Reset
Reset: Replace the separator element, then reset the service timer via the controller menu.
Common Replacement Parts
- Separator element: OEM spin-on or flange type (Match part number to compressor model)
- Compressor oil: ISO VG 46 synthetic (20L drum)
Frequently Asked Questions
- Q: How often should the separator be replaced?
Every 4000-8000 hours depending on oil quality and ambient conditions. Check the manual for the specific interval.
- Q: What happens if the separator is not replaced?
Differential pressure rises, energy consumption increases, and eventually the safety valve opens or the compressor shuts down.
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Source: Service Manual
Category: Compressor
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