Condition
Fault
Remedy
Loading solenoid valve
inoperative
Check and replace the valve as necessary
Full-load/no-load valve
malfunctioning
Have the valve inspected
Compressor capacity or
working pressure lower than
normal
Air consumption exceeds
capacity of compressor
Check pneumatic plant
Leaking connections and
damaged/leaking parts
Check for leaks. Tighten leaking
connections and replace damaged/leaking
parts.
Oil pressure too low
Oil level too low
Top up level as described in section Before
starting.
Oil filters clogged
Replace filters
Air temperature above normal
Inlet temperature too high due
to bad room ventilation or
recirculation of cooling air
Improve ventilation in compressor room
and prevent recirculation of cooling air
On ZR compressors,
insufficient cooling water flow
Check water temperature and increase
cooling water flow
On ZR compressors,
restriction in cooling water
system due to formation of
scale or dirt deposits
Consult the Atlas Copco Customer Center
Unloading pressure incorrectly
set
Check the controller setting.
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
Manually 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
Instruction book
98
AIF999999
Summary of Contents for ZR 200
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