Atlas Copco GA 55+

- Check transformer (T1) for correct connection.
Check the settings of drive motor overload relay (F21).
Check that the motor overload relay is set for manual resetting.
- On air-cooled compressors, check the setting of circuit breaker (Q15). Also check that the switch on
the circuit breaker is in position I.
- Fit air outlet valve (AV); see section Introduction for the location of the valve.
Close the valve.
Connect the air net to the valve.
On compressors equipped with a dryer bypass, fit the air outlet valve to the dryer bypass pipe.
- Connect the condensate drain outlet(s) to a drain collector.
See section Condensate system.
- For compressors with a DD or a DD and PD filter connect the automatic drain of the filters to a
suitable drain collector.
- Check the oil level. See section Oil and oil filter change.
- Provide labels, warning the operator that:
• The compressor may automatically restart after voltage failure (if activated, consult Atlas
Copco).
• The compressor is automatically controlled and may be restarted automatically.
- Switch on the voltage. Start the compressor and stop it immediately. Check the rotation direction of
drive motor (M1) while the motor is coasting to a stop. The correct rotation direction of the drive
motor is indicated by an arrow shown on the motor fan cowl.
If the rotation direction of the drive motor is incorrect, open the isolating switch and reverse two
incoming electric lines.
On air-cooled compressors, check also the rotation direction of the fan motor. Rotation arrows,
visible through the grating in the roof, are provided on the plate below the fan to indicate the correct
rotation direction of the fan motor.
If the rotation direction of the fan motor is incorrect, open the isolating switch and reverse two
incoming electric connections at the terminals of circuit breaker (Q15).
Incorrect rotation direction of the drive motor may cause damage to the compressor.
- On compressors equipped with an Elektronikon II regulator; check the programmed settings. Consult
section Programmable settings.
- Start and run the compressor for a few minutes. Check that the compressor operates normally.
5.2 Before starting
Remarks
• If the compressor has not run for the past 6 months, it is strongly recommended to
improve the lubrication of the compressor element at starting. Disconnect the inlet
hose, remove the unloader (UA) and pour 0.75 l (0.20 US gal, 0.17 Imp gal) of oil
into the compressor element. Reinstall the unloader and reconnect the inlet hose.
Make sure that all connections are tight.
• On Full-Feature compressors, switch on the voltage 4 hours before starting to
energise the crankcase heater of the refrigerant compressor of the dryer.
Instruction book
64 API603130