Condition Fault Remedy
Unloading pressure incorrectly
set
Check the controller setting.
On ZT compressors,
insufficient cooling air or
cooling air temperature too
high
Check and correct.
Condensate is not discharged
from condensate traps during
operation
Drain/pipe clogged Check and correct
Frozen drain piping Check and correct
Venting lines not/badly
assembled
Check and correct
Only on IC drain : intercooler
condensate check valve
defect/dirty/wrongly
assembled
Check and correct
Solenoid valve defect/dirty Check and correct
Manual operated solenoid
valve
Set valve to automatic operation
Level sensor defect/dirty Clean sensor or replace as necessary
Drain continuously discharges
air
Damaged/poor assembled
condensate drain (housing/
seals/valve/…)
Check and correct
Solenoid valve defect/dirty Check and correct
Level sensor defect/dirty Clean sensor or replace as necessary
For Full-Feature compressors
Condition Fault Remedy
Pressure dewpoint too high
Compressor loading periods
repeatedly too short
Take necessary action to increase duration
of loading periods
Incorrect dryer adjustment
Adjust the dryer as specified in Initial start-
up . Never operate the dryer with a
pressure difference/nozzle fraction beyond
the specified range.
Operating pressure too low
Do not operate the dryer at a pressure
lower than the one specified in Compressor
data
Dryer rotor/motor does not
turn
Consult Atlas Copco Customer Center
Rotor compartment sealing
ring, sealing sectors and rotor
need inspection
Consult Atlas Copco Customer Center
Instruction book
2920 1815 04 295
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