Instruction Book
101 9829 2115 69
9 Troubleshooting
9.1 Troubleshooting
Symptom Possible cause Corrective action
Poor dewpoint Free water in compressed air inlet
Check the condensate separators and
drains upstream of the dryer if they are
operating correctly
Temperature of compressed air is too
high
Clean compressor after-cooler
Working pressure is too low
Check outlet pressure of compressor and
check pressure drop over dryer, filters
Poor regeneration
• Too small purge nozzle for higher
working pressure installed.
• Regeneration silencers clogged.
Check the service indicator. The
regeneration pressure should be less
than 300 mBar
• Check if all other described symptoms
are applicable. Solve them
Poor desiccant
Replace desiccant. Check the
maintenance schedule for normal
replacement periods
Damaged desiccant
• Air flow too high during start-up.
Replace desiccant. Install sonic nozzle to
avoid problems in the future
• High pressure difference between
vessels when switching. This indicates
that a too small purge nozzle is installed
Oil vapors adsorbed by desiccant
Remove some desiccant from the bottom
part of the vessel. Yellow colored
desiccant indicates oil vapor adsorption
Dryer is stopped Check that the dryer is turned on.
Desiccant has become oversaturated for
a longer period
Replace desiccant
Too high purge
consumption
Incorrect purge nozzle installed.
Compare the actual working pressure
with the ordered optimized purge nozzle.
Higher working pressures result in higher
purge consumption that creates more
noise.
The dryer produces a lot
of noise
Incorrect purge nozzle installed.
See symptom Too high purge
consumption
Safety valve of silencer is opened
See symptom Too high purge
consumption
Check the silencers and their fixation Replace the silencer if necessary
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