Instruction Book
9829 2115 69 102
Symptom Possible cause Corrective action
Incorrect adjustment of regeneration
valve
Adjust the opening time of the
regeneration valves with the needle valve
on the actuator
Insufficient air leaves the
dryer
Incorrect purge nozzle installed. See symptom Too high purge
consumption
Compressor not performing enough Check inlet filters of compressor and
check the outlet pressure of the
compressor and compare this with the
inlet pressure of the dryer
Dryer fails to shift Pilot air missing Check pilot air filter. Clean if necessary
Failure on the inlet valves. Check the valve, actuator and the pilot air
pressure to the actuator
Solenoid Y1 or Y2 does not open Check and replace defective parts
Leak in pilot air tubes Replace tube
Leak in actuator of valve Service or replace actuator.
Regeneration valve fails
to open
Pilot air missing Check pilot air filter. Clean if necessary
Failure of the valve. Check the valve, actuator and the pilot air
pressure to the actuator
Solenoid Y1 or Y2 does not open Check and replace defective parts
Leak in pilot air tubes Replace tube
Incorrect adjustment of needle valve on
actuator
Adjust opening of needle valve
Leak in actuator of valve Service or replace actuator.
Unequal pressure in both
towers when switching
Installed purge nozzle is too small Compare the actual working pressure
with the ordered optimized purge nozzle.
Lower working pressures result in lower
purge flow.
Regeneration valve leaks Check if valve closes. Replace valve if
necessary.
Pressure in both towers
after shifting
Inlet valves don't switch See symptom Dryer fails to shift.
Regeneration valve fails to open See symptom Regeneration valve fails to
open.
Inlet valve leaks Disassemble and check. Replace valve
(or seal if applicable).
Excessive desiccant dust
in outlet pipe or filter
High air speeds inside vessel Check inlet flow and method of starting
up the dryer. Install sonic nozzle to avoid
problems in the future.
Unequal pressure inside vessels when
switching
See symptom Unequal pressure in both
towers when switching.
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