Atlas Copco GA 75 Generator Set

⚠ Before carrying out any maintenance, repair or adjustment, stop the compressor, press emergency stop button (S3), switch off the voltage and depressurize the compressor.

1. Remove transport fixations (painted red): bushes (2) from both gear casing supports, bushes (5) from both air receiver supports, support (3).
2. Check that electrical connections correspond to local codes and are tight; install earthing, short-circuit fuses in all phases and an isolating switch near the compressor.
3. Check transformer (T1) connection, settings of overload relay (F21) and fan motor circuit breaker (Q15), and automatic resetting of (F21).
4. Fit air outlet valve (AV), close it and connect the air net to the valve.
5. Connect manual condensate drain valve (Dma), close it and connect it to a drain collector.
6. Connect automatic condensate drain outlet (Daa) to the drain collector.
7. Water-cooled: fit drain valves in water inlet and outlet pipes; provide and open the water inlet and regulating valve.
8. Check oil level; pointer of level gauge (Gl) must register in the green or orange range; top up with Roto-injectfluid if needed.
9. Stick the automatic restart and automatic control warning labels on an obvious place near the control panel.
10. Switch on voltage, start and stop the compressor immediately; check rotation direction of drive motor (M1), then fan motor (M2); reverse two incoming lines if wrong.
11. Check the programmed settings.
12. Start and run the compressor for a few minutes; check that it operates normally.

⚠ Before carrying out any maintenance, repair or adjustment, stop the compressor, press emergency stop button (S3), switch off the voltage and depressurize the compressor.

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) by pushing the knob in the extremity of the body.
4. Reset the air filter service warning.

⚠ Stop compressor before cleaning coolers.

1. Air-cooled compressors: remove any dirt from the coolers with a fibre brush; never use a wire brush or metal objects.
2. Clean by air jet in reverse direction of normal flow while covering all compressor parts under the coolers.
3. If washing with a cleansing agent is necessary, consult Atlas Copco.
4. Water-cooled compressors: consult Atlas Copco for cleaning.

⚠ Never mix oils of different brands or types. Use only non-toxic oils.

⚠ Before carrying out any maintenance, repair or adjustment, stop the compressor, press emergency stop button (S3), switch off the voltage and depressurize the compressor.

1. Run the compressor unloaded for 3 minutes.
2. Stop the compressor. Switch off the voltage. Unscrew oil filler plug (FC) one turn only to release system pressure.
3. Remove vent plug (VP), wait 5 minutes, remove drain plug (DP2) and catch the oil in a receptacle.
4. Remove the oil filters (OF).
5. Clean the filter seats on the manifold. Oil the gaskets of the new elements. Screw in until gaskets contact their seats, then tighten by hand (approx. half a turn).
6. Drain the oil by removing drain plugs (DP1 and DP3); collect the oil and deliver it to the local oil collection service.
7. Reinstall plugs (DP1 up to DP3) and fill the air receiver with oil until the level reaches the filler plug opening.
8. Run the compressor for a few minutes; stop, wait a few minutes, depressurize, top up oil to the filler plug opening and tighten plug (FC).
9. Reset the oil and oil filter service warnings.

⚠ No adjustments are allowed. Never run the compressor without safety valve.

1. 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.
2. The valve can be tested on a separate compressed air line; if it does not open at the specified pressure, consult Atlas Copco.

1. Check the oil level (Gl); the pointer should register in the green range or in the orange range.
2. If the coloured part of the air filter service indicator (VI) shows full out, replace the air filter element (AF); reset the indicator and the service warning.
3. Water-cooled only: check that the cooling water drain valves in the inlet and outlet pipes are closed.
4. Water-cooled only: open the cooling water inlet valve.
5. Water-cooled only: open the water flow regulating valve.
6. If the compressor has not run for the past 6 months, pour 3/4 l of oil into the compressor element before starting.

⚠ Before carrying out any maintenance, repair or adjustment, stop the compressor, press emergency stop button (S3), switch off the voltage and depressurize the compressor.

1. Check the oil level during loaded operation; the pointer of the level gauge (Gl) must register in the green range.
2. If the level is in the LOW range, press the stop button, wait until the compressor has stopped and switch off the voltage; depressurize the oil system by unscrewing the oil filler plug (FC) one turn a
3. If the coloured part of the air filter service indicator (VI) shows full out, stop the compressor, switch off the voltage and replace the air filter element (AF); reset the indicator and the service w
4. Regularly check the display for readings and messages; remedy the trouble if alarm LED is alight or blinks.

⚠ A start command will be executed (if programmed and activated), even after manually stopping the compressor.

1. GA Full-feature: switch on the voltage 4 hours before starting to energize the crankcase heater of the refrigerant compressor.
2. Switch on the voltage. Check that voltage on LED lights up. The message <<compressor off>> appears.
3. Open the air outlet valve (AV).
4. Close the condensate drain valve (Dma).
5. Press start button I. The compressor starts and automatic operation LED lights up; after 10 seconds the drive motor switches from star to delta and the compressor runs loaded.
6. Water-cooled only: regulate the cooling water flow during loaded running to obtain the most suitable temperature at the compressor element outlet, between 2 and 7 degrees celsius above the relevant te

1. Press stop button O. LED goes out. The message <<Programmed stop>> appears. The compressor runs unloaded for 30 seconds and then stops.
2. Emergency: press button S3. Alarm LED blinks. Remedy the fault, unlock the button by pulling it out and press key <<Rset>> before restarting.
3. Close air outlet valve (AV) and switch off the voltage.
4. Open condensate drain valve (Dma).
5. Water-cooled only: close the cooling water inlet valve.
6. Water-cooled only: if freezing temperatures may be expected, drain the cooling system completely.

1. Stop the compressor and close the air outlet valve.
2. Switch off the voltage and disconnect the compressor from the mains.
3. Depressurize the compressor.
4. Shut off and depressurize the part of the air net connected to the outlet valve; disconnect the compressor air outlet pipe from the air net.
5. Isolate and disconnect the water system from the cooling water net.
6. Drain the oil, water and condensate circuits.
7. Disconnect the condensate piping from the condensate net.