Product Manual

Symptom Possible cause Corrective action
High dew point The dryer has not had the time to
regenerate completely.
Close the valve installed between the
dryer and the application (if permitted)
and have the desiccant regenerated.
Liquid water at dryer inlet Check PD filter and the drains. Fit an
extra water separator if required.
Excessive flow Check actual flow against maximum
specified.
Low inlet pressure Check pressure against specification,
and use inlet flow correction factors
where required.
High inlet temperature Check temperature against
specification, and use inlet flow
correction factors where required.
Silencer blocked or damaged Replace silencer.
Air leaks Tighten joints or fit new seals.
Dirty purge plug Clean purge plug.
Wrong size purge plug Contact your supplier
Shuttle valve stuck in one position Check if the exhaust valves closes off:
no air must leave from the silencer of
the tower that is drying. If air escapes
from the silencer, check the connections
for air leaks. If no solution: check the
membranes.
The dryer produces a
lot of noise.
Check the silencer and its fixation to the
unit.
Replace the silencer or correct its
fixation.
Insufficient air leaves
the dryer.
Too much purge air escapes. Check the condition of the solenoid
valve and replace if necessary.
Check the fitting of the solenoid valve
and tube to the bonnet for air leaks.
Check if the correct purge nozzle is
installed.
Excessive purge air
flow
Shuttle valve stuck in one position Check if the exhaust valves closes off:
no air must leave from the silencer of
the tower that is drying. If air escapes
from the silencer, check the connections
for air leaks.
Membrane damaged Check the membrane of the tower that
is having the high purge air flow.
Shuttle O-ring damaged If the shuttle does not seal, there will be
a leak path between inlet air and
exhaust. Open the valve block and
inspect the shuttle O-ring. Replace O-
ring if needed.
Inlet pressure drops
every cycle
Shuttle O-ring damaged If the shuttle does not seal, there will be
a leak path between inlet air and
exhaust. Open the valve block and
inspect the shuttle O-ring. Replace O-
ring if needed.
Instruction book
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