8 Problem solving
Overview
Symptom Possible cause Corrective action
Poor 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 pre-filtration and drains. Fit an extra
water separator if required.
Oil entering the dryer. Check pre-filtration. Oil damages the
desiccant. Replace the desiccant cartridges if
the desiccant has been contaminated.
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 Refer to section Technical data for purge plug
selection.
Shuttle remains 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 remains 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 sheared 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
52 2920 7083 21
To Next Page
Loading...
