Atlas Copco ga55+ Instruction Book page 83

Instruction book
3. Compare the turbidity of the sample with the reference 15 ppm turbidity bottle.
4. If the turbidity of the test sample is more intense than the reference turbidity, a request for servicing
should be initiated, to be carried out within 2 weeks time. The vertical position of the test outlet ensures
that there is enough clean activated carbon left above this position to keep the condensate under 15 ppm
for at least 2 weeks (valid for a GA 90 with dryer which runs 24 h/day at reference conditions).
Filter replacement instructions
This instruction makes clear which steps have to be taken to do maintenance and to ensure proper
functioning after maintenance. These are the steps to be taken when servicing:
1. Stop the compressor and close the air outlet valve. Switch off the voltage.
2. Open/ remove the compressor side panel in front of the OSCi.
3. Position the drain tubes connected to the service drain valves (4 - Condensate flow scheme and View of
OSCi) over a recipient and open the drain valves. Wait until the drains are fully discharged and
dispose of the oil-containing water according to local regulations.
4. Unscrew the bolts that fix the OSCi to the compressor floor plate and detach the tubes and wires
from vessel 2. The OSCi can then be taken out of the compressor. The attached tubes and electrical
wires are long enough to slide out the OSCi without disconnecting them, but this should be done
carefully, paying attention not to obstruct the tubes and wires.
5. Unscrew the clamping rings, take off the covers and take out the 3 filter bags. The buckets in which
the new filters are supplied can be used to store the old filters.
6. Clean out the OSCi with water and tissue. Do not use any form of soap or detergents as they could
contain dispersants which deteriorate the ability to break oil-water emulsions.
7. Close the service drain valves.
8. Take the new filters from the service kit. Verify that the white filter for vessel 1 is of circular shape. If it
is elliptical due to transport, squeeze it into circular shape so that it can move freely up and down in
vessel 1. Insert the new filters in the vessels corresponding to their label. Verify that the sensor arm
(8-Viewof OSCi) is in the upward position and rests on the edge of the filter bag in the first
vessel.
9. Put covers 2 and 3 back on the vessels and tighten the clamping rings.
10. Reposition the OSCi inside the compressor and fix the OSCi to the floor plate with the bolts (M 8).
Becareful not to obstruct tubes and wires, and see to it that they can't come into contact with other
components of the compressor. Use the cable holder on vessel 2 to fix the redundant parts of the tubes
and wires. Seeto it that the outlet tube and the test tube are nowhere higher than the respective outlet
connections onvessel 3 (View of OSCi outlet).
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