Atlas Copco GA 75+ Instruction Book page 138

Condition
Water is present on the
floor around the
compressor (and on
the compressor
frame).
The time frame that it
takes for the turbidity of
the test sample to be
above the limit of the
reference sample is
much shorter than
expected, based on
the estimated filter
lifetime. See also
section Technical
data.
136
Fault
A connection is
leaking.
A push-in coupling is
leaking.
No connections are
leaking but the water
level in vessel 2 or 3
reaches the top of the
vessel.
If the above
requirements are met
and the water level
reaches the top of
vessel 2, or if the water
level in vessel 1
reaches at least the
sight glass.
No enough air flow
during the test.
Remedy
Stop the compressor. Open the side panel and inspect the
OSCi (remove the covers from the vessels). Verify that the
drain valves (4 - Condensate flow scheme and View of OSCi)
at the bottom of vessel 1 and 2 are closed.
Drain the OSCi and try to fix the problem.
If a connection is leaking, take out the corresponding tube
and cut it off straight 1 cm further. If that doesn't help, order
a new connection (spare part).
Verify that the outlet tube is positioned everywhere below the
outlet connection on vessel 3 (View of OSCi outlet) and is not
blocked off somewhere (also outside the compressor). If
structural constraints require the outlet pipe to be above the
level of the outlet connection on vessel 3, install a pump
(suitable to run dry) in the outlet circuit.
Remove all the filters, clean the OSCi and order a filter
service kit to replace the filters. Verify the vessel separator
and scavenge line flow, and replace them in case of
abnormalities.
If an overflow is to be avoided at all costs, please ask your
service centre to program the Elektronikon® to shut down the
compressor when an overflow alarm is generated.
When servicing the filters, the following test procedure must
be carried out after draining the vessels: Disconnect the OSCi
air tube at the bottom of vessel 2, and guide the air tube
through the baffles to outside the compressor canopy. Close
all compressor panels, start the compressor and wait for
loading condition. Check if airflow is coming out of the airtube
(must be between 450 and 1000 l/h) (between 15.9 and 35.3
cu ft/h). Stop the compressor.
Disconnect the strainer (4-View of OSCi inlet) and take out
the strainer. Clean the strainer and the nozzle with
compressed air and dry tissue. Check that the air tube does
not touch any other components and is not hindered in any
way. Repeat the test procedure.
If the airflow coming out of the air tube is still not sufficient,
order a spare part solenoid valve (3-OSCi air injection).
In case there was enough airflow during the test, check to see
if there is a thick oily condensate present in all 3 vessels. Then
check the oil separator element and the scavenge line flow
of the compressor and order the corresponding service kits
in case these components are not working correctly.
Instruction book
2920 7109 60