Adjustments And Servicing Procedures; Air Filter; Coolers; Safety Valve - Atlas Copco GA55 Instruction Book

5 Adjustments and servicing
procedures
5.1 Air filter (AF-Fig. 1.4)
1. Stop the compressor. Switch off the voltage. Release the
snap clips and remove the dust trap and air filter element.
Clean the trap. Discard the filter element.
2. Refit the new element and the trap.
3. Reset the service indicator (VI-Fig. 3.6) by pushing the knob
in the extremity of the body.
4. Reset the air filter service warning 1).

5.2 Coolers

Keep the coolers clean to maintain the cooling efficiency.
On air-cooled compressors
Remove any dirt from the coolers with a fibre brush. Never
use a wire brush or metal objects. Then clean by air jet in
reverse direction of normal flow while covering all compressor
parts under the coolers. If it is necessary to wash the coolers
with a cleansing agent, consult Atlas Copco.
On water-cooled compressors
Consult Atlas Copco for cleaning.
5.3 Safety valve (SV-Fig. 3.6)
Operate the safety valve, depending on the type of valve:
- by unscrewing the cap one or two turns and retightening it
- or by pulling the valve lifting lever
Testing
The valve can be tested on a separate compressed air line. If
the valve does not open at the pressure specified in section 7.2,
consult Atlas Copco.
Warning: No adjustments are allowed. Never run the
compressor without safety valve.
Footnotes chapter 5
1) Using key <<Rset>> in submenu <<Service>>: see User manual
for Elektronikon regulator, section "Service submenu".
30

6 Problem solving

Consult the User manual for Elektronikon regulator (section
"Status data submenu") if a service message or fault message
appears on the display (4-Fig. 1.9) or when alarm LED (3-Fig.
1.9) is alight or blinks.
Before starting repairs:
Press stop button (9-Fig. 1.9), wait until the compressor has
stopped (approx. 30 seconds), press stop button (S3-Fig. 1.9)
and switch off the voltage.
Close the air outlet valve and depressurize the air system.
Furthermore, apply all relevant safety precautions, including
those mentioned in this book.
The air outlet valve can be locked as described in section 4.
Mechanical faults and suggested remedies (Fig. 1.6)
1 Push button I is pressed, compressor starts running, but
does not load after a delay time.
a Solenoid valve (Y1) out of order.
a Replace valve.
b Inlet valve (IV) stuck in closed position.
b Have valve checked.
c Leak in control air flexibles.
c Replace leaking flexible.
d Minimum pressure valve (Vp) leaking (when net is
depressurized).
d Have valve checked.
2 Compressor does not unload, safety valve blows.
a Solenoid valve (Y1) out of order.
a See 1a.
b Inlet valve (IV) does not close.
b See 1b.
3 Condensate is not discharged from condensate trap
during loading.
a Discharge flexible clogged.
a Check and correct as necessary.
b Float valve malfunctioning.
b Remove float valve assembly, clean and check.
4 Compressor air output or pressure below normal.
a Air consumption exceeds air output of compressor.
a Check equipment connected.
b Choked air inlet filter element (AF).
b Replace filter element.
c Solenoid valve (Y1) malfunctioning.
c See 1a.
d Leak in control air flexibles.
d See 1c.
e Inlet valve (IV) does not fully open.
e See 1b.
f Oil separator element (OS) clogged.
f Have element replaced.
g Air leakage.
g See 1c.
Instruction book
2920 1381 02