Ga90 PDF

This instruction book meets the requirements for instructions specified by the machinery directive
98/37/EC and is valid for CE as well as non-CE labelled machines
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*2920125102*
2000-01
Registration code: APC G 90/'99 / 38 / 995

Replaces 2920 1251 01
No. 2920 1251 02
Copyright 2000, Atlas Copco Airpower n.v., Antwerp, Belgium.

Any unauthorized use or copying of the contents or any part thereof is prohibited. This applies
in particular to trademarks, model denominations, part numbers and drawings.
Important
1. This book applies to the compressors from serial number
AIF-024 378 onwards.
2. This book must be used together with the "User manual for Elektronikon regulator", printed matter no.
2920 1291 0x.
Instruction Book
GA90 - GA110 - GA132 - GA160 - GA200 - GA250 - GA315

GA90 W - GA110 W - GA132 W - GA160 W - GA200 W GA250 W - GA315 W
Atlas Copco Stationary Air Compressors
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Preventive maintenance schedule for the compressor .
4.2 Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.1 Fan motors (GA only) . . . . . . . . . . . . . . . . . . .
4.2.2 Drive motor . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Oil specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.1 Roto-injectfluid . . . . . . . . . . . . . . . . . . . . . . . .
4.4 Oil change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5 Oil filter change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.6 Storage after installation . . . . . . . . . . . . . . . . . . . . . . . .
4.7 Service kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Preparation for initial start-up . . . . . . . . . . . . . . . . . . .
3.2 Before starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Routine starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Starting after emergency stop or shut-down . . . . . . . .
3.5 During operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5.1 Checking the display . . . . . . . . . . . . . . . . . . . .
3.6 Manual unloading/loading . . . . . . . . . . . . . . . . . . . . . .
3.7 Stopping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8 Taking out of operation . . . . . . . . . . . . . . . . . . . . . . . . .
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Dimension drawings . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Installation proposal . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Electric cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.1 GA - 50 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.2 GA W - 50 Hz . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.3 GA/GA W - 60 Hz (except for Canada/USA) .
2.3.4 GA/GA W - 60 Hz (Canada/USA) . . . . . . . . .
2.4 Pictographs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 Cooling water requirements . . . . . . . . . . . . . . . . . . . . .
29
29
30
30
30
30
30
30
30
31
32
25
25
26
26
26
27
27
28
28
28
14
14
17
20
20
20
20
23
23
24
Page
Leading particulars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Elektronikon control system . . . . . . . . . . . . . . . . . . . . . 3
1.2.1 Elektronikon regulator . . . . . . . . . . . . . . . . . . . . 3
1.2.2 Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2.3 Compressor control modes . . . . . . . . . . . . . . . . 8
1.2.4 External compressor status indication . . . . . . . . 8
1.2.5 External communication . . . . . . . . . . . . . . . . . . 8
1.3 Regulating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3.1 Air flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3.2 Condensate drain system . . . . . . . . . . . . . . . . . . 9
1.3.3 Oil system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.3.4 Cooling system . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.3.5 Regulating system . . . . . . . . . . . . . . . . . . . . . . 12
Contents
Principal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1 Readings on display . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2 Programmable settings . . . . . . . . . . . . . . . . . . . . . . . . .
7.3 Settings of safety valves . . . . . . . . . . . . . . . . . . . . . . . .
7.4 Settings of overload relay, circuit breakers and fuses .
7.4.1 Motor overload relay and fuses for
GA/GA W - 50 Hz with ABB motors . . . . . . .
GA/GA W - 60 Hz with ABB motors . . . . . . .
GA/GA W - 60 Hz with Siemens motors . . . .
7.4.4 Fan motor circuit breakers for GA - 50 Hz . . .
7.4.5 Fan motor circuit breakers for GA - 60 Hz . . .
7.5 Compressor specifications . . . . . . . . . . . . . . . . . . . . . .
7.5.1 Reference conditions . . . . . . . . . . . . . . . . . . . .
7.5.2 Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.5.3 Specific data of GA/GA W 90 up to -160
7.5 bar - 50 Hz . . . . . . . . . . . . . . . . . . . . . . . . .
10 bar - 50 Hz . . . . . . . . . . . . . . . . . . . . . . . . . .
13 bar - 50 Hz . . . . . . . . . . . . . . . . . . . . . . . . . .
100 psi - 60 Hz . . . . . . . . . . . . . . . . . . . . . . . . .
125 psi - 60 Hz . . . . . . . . . . . . . . . . . . . . . . . . .
150 psi - 60 Hz . . . . . . . . . . . . . . . . . . . . . . . . .
200 psi - 60 Hz . . . . . . . . . . . . . . . . . . . . . . . . .
7.5.10 Specific data of GA/GA W 200 and -250
7.5 bar - 50 Hz . . . . . . . . . . . . . . . . . . . . . . . . .
10/13 bar - 50 Hz . . . . . . . . . . . . . . . . . . . . . .
100 psi - 60 Hz . . . . . . . . . . . . . . . . . . . . . . . . .
125 psi - 60 Hz . . . . . . . . . . . . . . . . . . . . . . . . .
150 psi - 60 Hz . . . . . . . . . . . . . . . . . . . . . . . . .
200 psi - 60 Hz . . . . . . . . . . . . . . . . . . . . . . . . .
7.6 Conversion list of SI units into British/US units . . . . .
2920 1251 02
41
41
40
40
40
39
39
39
38
38
38
37
37
37
35
36
36
36
36
36
34
34
33
33
33
34
34
Problem solving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7
Page
Adjustments and servicing procedures . . . . . . . . . . . . . . 32
5.1 Air filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.2 Coolers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.3 Safety valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6
The company reserves the right to make changes without prior notice.
For all data not mentioned in the text, see sections "Preventive maintenance schedule" and "Principal data".
In all correspondence mention the type and the serial number, shown on the data plate.
Repairs must be carried out by trained personnel from Atlas Copco who can be contacted for any further information.
Keep the book available for the operator and make sure that the machine is operated and that maintenance is carried out according
to the instructions. Record all operating data, maintenance performed, etc. in an operator's logbook available from Atlas Copco.
Follow all relevant safety precautions, including those mentioned on the cover of this book.
Read this book before putting the machine into operation to ensure correct handling, operation and proper maintenance from the
beginning. The maintenance schedule comprises measures for keeping the machine in good condition.
This instruction book describes how to handle the machines to ensure safe operation, optimum efficiency and long service life.
Instruction book
Elektronikon regulator
2920 1251 02
The regulator maintains the net pressure between programmable

limits by automatically loading and unloading the compressor.
A number of programmable settings, e.g. the unloading and
loading pressures, the minimum stop time and the maximum
number of motor starts are taken into account.
1.2.1.1 Automatic control of compressor operation
1.2.1
1.2 Elektronikon control system
Oil/water separation
Atlas Copco has oil/water separators (type OSM), especially
designed for GA/GA W compressors, to separate oil from
condensate to meet the requirements of the local environmental
codes.
Heavy-duty filters
A heavy-duty filter kit is available as option allowing the
compressor to operate in heavily contaminated surroundings.
Energy recovery
The compressors can easily be provided with the Atlas Copco
energy recovery systems to recover the major part of the
compression heat in the form of hot water.
GA and GA W include mainly:

Air filter(s)
One or two compressor elements 1)
One or two unloaders 1)
Air receiver/oil separator
Air cooler
Oil cooler(s)
Drive motor
Drive coupling
Gear casing
Elektronikon control system
Safety valves
The compressors are available for a maximum working pressure

of:
7.5, 10 or 13 bar(e) for 50 Hz versions
107, 132, 157 or 200 psig for 60 Hz versions
GA90 up to GA315 are air-cooled, abbreviated as "GA". GA90

W up to GA315 W are water-cooled, abbreviated as "GA W".
GA90 up to GA315 and GA90 W up to GA315 W are singlestage, oil-injected screw compressors, driven by an electric
motor and enclosed in a sound-insulated bodywork.
1.1 General description
1 LEADING PARTICULARS
Instruction book
1) GA/GA W 90 up to -160 are equipped with one compressor

element and unloader, all other types have two compressor
elements and unloaders.
2) This funcion is called the Timer function. See "User manual for
Elektronikon regulator", section "Submenu TIMERS".
The regulator continuously monitors the oil, oil filters, oil

separator, drive motor grease and air filters. Each input is
compared to programmed maximum time intervals or pressure
drops. If these limits are exceeded, a message will appear on
display (4-Fig. 3a) to warn the operator to replace the indicated
component, to change the oil or to grease the motor as the case
may be.
1.2.1.3 Monitoring components subject to service
The message disappears as soon as the cause of the trouble is

remedied.
Shut-down warning
Before the shut-down level for the compressor element outlet
temperature is reached, a message will appear on display (4Fig. 3a) and general alarm LED (3) will light up, to warn the
operator that the shut-down warning level is exceeded. The
shut-down warning level is a programmable setting below the
shut-down level.
Remedy the trouble and reset the message on the display before
restarting. See "User manual for Elektronikon regulator",
section "Submenu STATUS DATA".
Shut-down
If the temperature at the outlet of the compressor elements
exceeds the programmed shut-down level, the compressor will
be stopped. This will be indicated on display (4-Fig. 3a) and
general alarm LED (3) will blink. The compressor will also be
stopped in case of overload of the drive motor and on GA also
in case of fan motor overload.
1.2.1.2 Protecting the compressor
Warning
A number of time-based automatic start/stop commands may
be programmed. 2) Take into account that a start command
will be executed (if programmed and activated), even after
manually stopping the compressor.
The regulator stops the compressor whenever possible to reduce

the power consumption and restarts it automatically when the
net pressure decreases. In case the expected unloading period
is too short, the compressor is kept running to prevent tooshort standstill periods.
Air filter
Air cooler
Oil cooler
Check valve
Oil drain plug, air receiver
Oil drain plug, oil cooler
AF.
AR.
Ca.
Co.
CV.
DP1.
DP4.
Fig. 1a GA90
DP1/4 GL
FC1
AR
FN2 SV Ca Co Vp
Figs. 1. GA90 and GA110 W
E.
Compressor element
FC1. Oil filler plug
FC2. Oil filler plug (only to be used at
initial start-up)
FN2. Fan
Gl.
Oil level indicator
M1. Drive motor
M1
AF
OF.
SV.
UA.
Vp.
Vs.
Y1.
2920 1251 02
Oil filters
Safety valve
Unloader
Minimum pressure valve
Oil stop valve
Loading solenoid valve
50314F
CV
OF
UA
Instruction book
50315F
2920 1251 02
Warning
If activated and provided the regulator was in the automatic
operation mode and the compressor control mode (local, remote
1 or remote 2 - see section 1.2.3) was not changed during the
voltage failure, the compressor will automatically restart if the
supply voltage to the module is restored within a programmed
time period (this time period is called the power recovery
time).
For compressors leaving the factory, this function is made

inactive. If desired, the function can be activated. Consult
Atlas Copco.
CV
Vs
M1
UA
FC2
AF
After a start command (either automatic start by the electronic

regulator or manual start), the permissive start function is
operating: if the oil injection pressure at the compressor
elements exceeds the programmed level, the compressor will
not start (indicated as <<Start failure>>). See "User manual
for Elektronikon regulator", section "Programmable settings
for GA90/315".
1.2.1.5 Permissive start
The power recovery time can be set between 1 and 254 seconds
or to 0. If the power recovery time is set to 0, the compressor
will always restart after a voltage failure, no matter how long it
takes to restore the voltage.
Fig. 1b GA110 W
Y1 Ca Co
1.2.1.4 Automatic restart after voltage failure
OF
AR
Vp
Instruction book
50309F
K22
T1
K23
K15/16
1X1
Q15/16
F1/2
F3/4/5
T2
10
11
50749F
12
S2
13
S5
2920 1251 02
One contactor/circuit breaker on GA90 and -110, two

contactors/circuit breakers on GA132 up to -315, not
provided on GA W.
Fuses
Circuit breakers
Overload relay, drive motor (M1)
Fan motor contactors 1)
Line contactor
Star contactor
Delta contactor
Fan motor circuit breakers 1)
Transformers
Terminal strip
Earthing rail
Fig. 2. Electric cabinet (typical example)
1)
F1/F2.
F3/F5.
F21.
K15/16.
K21.
K22.
K23.
Q15/16.
T1/T2.
1X1.
1X3.
Fig. 3a. Control panel
K21 F21
1X3
Instruction book
F3
F1
F2
F1
General alarm LED
Display
Indicates messages concerning the

compressor operating condition, a
service need or a fault. See "User
manual for Elektronikon
regulator" sections "Submenu
STATUS DATA" and "Submenu
SERVICE".
Blinks if a shut-down condition

exists, if a sensor used to protect
the compressor is out of order or
after an emergency stop. See
section 1.2.1.
Is alight if a shut-down warning

condition exists. See section 1.2.1.
2920 1251 02
Voltage on LED
Indicates that the voltage is

switched on.
Automatic operation Indicates that the regulator is autoLED

matically controlling the compressor: the compressor is loaded,
unloaded, stopped and restarted
depending on the air consumption
and the limitations programmed in
the regulator.
Ref. Designation
Indicators, keys and buttons
1.2.2 Control panel (Fig. 3a)
Fig. 3c. Example of a main menu
Select
Main Screen
Status data
Fig. 3b. Example of the main display
F3
Unload
Automatically loaded
Menu
Show More
F2
7.0 bar
Compressor outlet
Instruction book
Control mode switch Key switch to select the

compressor control modes. See
section 1.2.3.
Push button to stop the compressor

immediately in case of emergency.
After remedying the trouble,
unlock the button by turning it
anti-clockwise.
Push button to stop the

compressor. LED (1) goes out.
The compressor will run unloaded
for 30 seconds before stopping.
Push button to start the

compressor. LED (1) lights up
indicating that the regulator is
operative (in automatic operation).
The LED goes out after unloading
the compressor manually.
Key to go to the next field of the

display.
Keys to scroll through the display.
Keys to control and program the

compressor. See below.
Delete
Limits
List
To add compressor start/stop commands (day/

hour)
To cancel a programmed setting when
programming parameters
To delete compressor start/stop commands
To show limits for a programmable setting
To list programmed start/stop commands
(day/hour)
Add
Cancel
Function
Designation
(4-Fig. 3a)
Function keys
The functions of the keys vary depending on the displayed menu.
The actual function is indicated just above the relevant key.
The most common functions are listed below:
Selecting a menu
To facilitate controlling the compressor, menu-driven programs
are implemented in the Elektronikon regulator. Use function
keys (5) to select the menus to program and monitor the
compressor. The "User manual for Elektronikon regulator"
deals elaborately with all regulator functions.
S5
Emergency stop
button
S2
Start button
Stop button
Tabulator key
Scroll keys
Function keys
Ref. Designation
To load the compressor manually

To return from a menu to the main display
(Fig. 3b)
Starting from the main display (Fig. 3b), to
initiate the main menu (Fig. 3c) which gives
access to submenus
Starting from a submenu, to return to the main
menu (Fig. 3c)
To modify programmable settings
To have a quick look at the compressor status
To program modified settings
To reset a timer or message
To return to a previously shown option or
menu
To select a submenu or to read more details
of a selection shown on the display
To unload the compressor manually
Function
Remote control mode 2. The compressor

can be controlled by an ES-type controller or
by computer. Consult Atlas Copco.
13
Local control mode (remote control mode

is made inactive):
- The compressor can only be controlled
by the buttons on the control panel.
- The compressor can be started and
stopped via function Timer (see section
1.2.1), if programmed and activated.
11
Remote control mode 1 (local control is

made inactive):
- The compressor can only be started and
stopped by an ES100 sequence selector
or by external switches. Do not use
maintained-action buttons in case of
remote starting/stopping.
- Compressor start/stop commands via
function Timer (see section 1.2.1) are still
possible, if programmed and activated.
- Emergency stop button (S2) remains
active.
Compressor off.
10
12
Compressor control mode
Key position
Key switch (S5-Fig. 3a) allows the operator to select four control
modes:
1.2.3 Compressor control modes
Unload
Select
Modify
Show More
Program
Reset
Return
Menu
Load
Main Screen
Designation
(4-Fig. 3a)
--
K06
K07
K08
56-57
50-51
52-53
54-55
10 A / 230 V AC
10 A / 230 V AC
10 A / 230 V AC
10 A / 230 V AC
Relay Terminals Max. load

on strip
1X1
Fit the communication module (COM1) and fix it using

plate (3).
Connect the 24V power supply from terminals (11 and
12) of terminal strip (1X1) to connector (5X1) of
communication module (COM1).
Connect an earth cable between module (COM1) and the
module of the regulator.
Connect the cable delivered with the COM1 module from
connector (5X3) of the COM1 module to a free ..X2
connector on a module of the compressor regulator.
Consult Atlas Copco to check the installation and to have
the communication software loaded.
2920 1251 02
GA/GA W 90 up to -160
Air drawn through filter (AF) and unloader (UA) is compressed
1.3.1 Air flow
1.3 Regulating system (Figs. 5)
5.
4.
3.
2.
1.
Installation (Fig. 4)
If it is desired to connect the compressor to an Atlas Copco ES

system (e.g. to an ES100 sequence selector), an optional
communication module (COM1) needs to be installed.
1.2.5 External communication
Warning
Stop the compressor and switch off the voltage before
connecting external equipment.
Automatic operation
Warning
Shut-down
Control mode
REMOTE 1
Indication
Terminal strip (1X1-Fig. 2) is provided with auxiliary contacts

for external indication of:
1.2.4 External compressor status indication
Important
The regulator will only react to a new control mode if the
new position of the control mode switch is maintained for
3 seconds.
To avoid unauthorized switching over to another control
mode, take out the key after selecting the required mode.
Instruction book
2920 1251 02
Check valves (CV1 and CV2) prevent blow-back of compressed

air.

Air drawn through filters (AF) and unloaders (UA1 and UA2)
is compressed in compressor elements (E1 and E2).
Compressed air and oil are discharged to air receiver/oil
separator (AR) via check valves (CV1 and CV2). In the oil
separator compressed air is separated from the oil. The air is
blown via minimum pressure valve (Vp) to air cooler (Ca).
The cooled air is discharged through moisture trap (MTa) and
outlet valve (AV) towards the air net.
Check valve (CV) prevents blow-back of compressed air.
in compressor element (E). Compressed air and oil are

discharged to air receiver/oil separator (AR) via check valve
(CV). In the oil separator compressed air is separated from the
oil. The air is blown via minimum pressure valve (Vp) to air
cooler (Ca). The cooled air is discharged through moisture
trap (MTa) and outlet valve (AV) towards the air net.
Instruction book
Communication module
Electronic regulator
Expansion modules (upper module not always
installed)
Guide
Slot
Plate
Cable
Air pressure forces the oil from receiver (AR) through oil
cooler(s) (Co), filters (OF) and valve (Vs) to compressor
element (E) and the lubrication points.
1.3.3 Oil system
A moisture trap (MTa) is installed downstream of the air cooler

to prevent condensate from entering the air outlet pipe. The
trap is provided with a float valve for automatically draining
condensate (Daa) and with a manual drain valve (Dma).
1.3.2 Condensate drain system
All GA/GA W
Minimum pressure valve (Vp) prevents the receiver pressure
from dropping below a minimum pressure. The valve has a
built-in check valve.
Fig. 4. Installation of communication module (typical

example)
1.
2.
3.
4.
COM1.
MKIII.
SIOE.
10
Valves (BV) by-pass oil cooler(s) (Co) when starting the
Oil stop valves (Vs1 and Vs2) prevent compressor elements

(E1 and E2) from flooding with oil when the compressor is
stopped.

Air pressure forces the oil from receiver (AR) through oil
cooler(s) (Co), filters (OF) and valves (Vs1 and Vs2) to
compressor elements (E1 and E2) and the lubrication points.
Valve (BV) by-passes oil cooler(s) (Co) when starting the

compressor from cold condition to ensure rapid warming of
the oil to normal working temperature.
Oil stop valve (Vs) prevents compressor element (E) from

flooding with oil when the compressor is stopped.
2920 1251 02
On GA, the coolers are cooled by fans (FN2/3) (GA90 and 110 are provided with one fan). GA W are provided with a
cooling water system.
The system includes air cooler (Ca) and oil cooler (Co) (GA
W 132 up to -315 have two oil coolers).
1.3.4 Cooling system
All GA/GA W
In receiver (AR) most of the oil is removed from the air
centrifugally. Almost all of the remaining oil is removed by
separator element (OS).
compressor from cold condition to ensure rapid warming of

the oil to normal working temperature.
Fig. 5a GA90 up to -160 during unloading (7.5-10 bar/100-125-150 psi)
Instruction book
Compressor element
Filler plug, oil
Fans
Oil level indicator
Moisture trap
Drive motor
Oil filters
Oil separator element
Restrictors
Regulating valve
Pressure selector valve
Safety valve
Unloader
Unloader
Unloader
Unloading valve
Figs. 5 Regulating systems
For GA/GA W 90 up to -160: only provided on 13 bar/200 psi versions
E2.
FC.
FN2/3.
Gl.
MTa.
M1.
OF.
OS.
Rf1/3.
RV.
Ss.
SV.
UA.
UA1.
UA2.
UV.
3.
4.
5.
V2.
V3.
Y1.
1.
2.
UV1.
UV2.
Vp.
Vs.
Vs1.
Vs2.
V1.
Fig. 5b GA90 up to -160 during loading (13 bar / 200 psi)
Air filter(s)
Air outlet valve
Thermostatic by-pass valve(s),
oil cooler(s)
Air cooler
Elektronikon regulator
Oil cooler(s)
Check valve
Check valve
Check valve
Automatic condensate drain
outlet
Manual condensate drain valve
Drain plug, oil
Compressor element
Compressor element
2920 1251 02
1)
Dma.
DP1.
E.
E1.
Ca.
CM.
Co.
CV.
CV1.
CV2.
Daa.
AF.
AR.
AV.
BV.
Instruction book
Unloading valve
Unloading valve
Minimum pressure valve
Oil stop valve
Oil stop valve
Oil stop valve
Control valve for unloading
valve
Vent valve
Vent valve 1)
Loading solenoid valve
Chamber
Flexible, control air or blowoff air
Flexible, blow-off air
Flexible, control air
By-pass hole, unloader
11
12
If the air consumption is less than the air delivery of the

compressor, the net pressure increases. When the net pressure
reaches the upper limit of the working pressure (unloading
pressure), solenoid valve (Y1) is de-energized. The plunger of
the valve moves downwards by spring force:
1.3.5.1 Unloading
The system is controlled by Elektronikon regulator (CM)

which keeps the net pressure within programmable pressure
limits by automatically loading and unloading the compressor
depending on the air consumption.
1.3.5 Regulating system
2920 1251 02
1. Control pressure is fed via flexible (2) and selector valve
(Ss) through solenoid valve (Y1) to valves (V1 and V2).
2. The plungers of valves (V1 and V2) move against spring
force.
3. Control pressure present in chamber (1) of unloader (UA)
is vented to atmosphere through valve (V1). Unloading
valve (UV) closes by spring force.
4. Receiver pressure is released to unloader (UA):
- through flexible (2) and valve (V2)
- on 13 bar/200 psi compressors also through valve (V3)
as this valve is kept open by air from the outlet of
compressor element (E)
5. As the receiver pressure decreases, selector valve (Ss)
switches over.
6. On 13 bar/200 psi compressors, as the pressure at the
Fig. 5c GA W 200 up to -315 during unloading (10-13 bar/125-150-200 psi)
Instruction book
outlet of compressor element (E) decreases, valve (V3)

closes by spring force and stops blowing off air.
Valve (V2) allows the small flow of air, which remains
drawn in through by-pass hole (5), to blow off from
receiver (AR) via flexible (2) to unloader (UA).
Air delivery is stopped (0 %), the compressor runs
unloaded.
2920 1251 02
8.
7.
6.
5.
4.
13
For 7.5 bar/100 psi compressors, receiver pressure is

released:
- through flexible (2) and valve (V2) to unloader (UA1)
- through flexible (3) and valve (V3) to unloader (UA2)
For 10/13 bar/125/150/200 psi compressors, receiver
pressure is released:
- through flexible (2) and valve (V2) to unloaders (UA1
and UA2)
- through flexible (3) and valve (V3) to unloaders (UA1
and UA2)
As the receiver pressure decreases, selector valve (Ss)
switches over.
Valves (V2 and V3) allow the small flow of air, which
remains drawn in through by-pass holes (5), to blow off
from receiver (AR) via flexibles (2 and 3) to unloaders
(UA1 and UA2).
Air delivery is stopped (0 %), the compressor runs
unloaded.
Fig. 5d GA W 200 up to -315 during loading (7.5 bar/100 psi)

1. Control pressure is fed via flexible (2) and selector valve
(Ss) through solenoid valve (Y1) to valves (V1, V2 and
V3).
2. The plungers of valves (V1, V2 and V3) move against
spring force.
3. Control pressure present in chambers (1) of unloaders
(UA1 and UA2) is vented to atmosphere through valve
(V1). Unloading valves (UV1 and UV2) close by spring
force.
8.
7.
Instruction book
14
2.1 Dimension drawings (Figs. 6)
2 INSTALLATION
2920 1251 02

1. The plungers of valves (V1,V2 and V3) return to their
original positions by spring force as the control pressure
is vented via solenoid valve (Y1).
2. Control pressure is fed via flexible (2) or flexible (4),
selector valve (Ss) and valve (V1) to chambers (1) of
unloaders (UA1 and UA2) to open unloading valves (UV1
and UV2).
3. Valves (V2 and V3) stop blowing off the air which is drawn
in.
4. Air delivery is resumed (100 %), the compressor runs
loaded.
Fig. 6a. Dimension drawing GA90 and -110
1. The plungers of valves (V1 and V2) return to their original
positions by spring force as the control pressure is vented
via solenoid valve (Y1).
2. Control pressure is fed via flexible (2) or flexible (4),
selector valve (Ss) and valve (V1) to chamber (1) of
unloader (UA) to open unloading valve (UV).
3. Valve (V2) stops blowing off the air which is drawn in.
4. Air delivery is resumed (100 %), the compressor runs
loaded.
When the net pressure decreases to the lower limit of the

working pressure (loading pressure), solenoid valve (Y1) is
energized. The plunger of solenoid valve (Y1) moves upwards
against spring force:
1.3.5.2 Loading
Instruction book
2920 1251 02
Instruction book
16
Fig. 6e. Dimension drawing GA200 up to -315
Fig. 6c. Dimension drawing GA132 and -160

15
Fig. 6d. Dimension drawing GA W 132 and -160
Fig. 6b. Dimension drawing GA W 90 and -110
2920 1251 02
Instruction book
The pressure drop over the air outlet pipe can be

calculated as follows:
3.
L x 450 x Qc
d5 x P
_______________________
2920 1251 02
dp =
Remove the plastic plug (if provided) from the

compressor air outlet pipe and fit the air outlet valve to
compressor outlet pipe (3-Fig. 8). Close the valve and
connect it to the net.
2.
1.85
Install the compressor on a level floor suitable for taking

the weight of the compressor. For proposal 1, the
recommended minimum distance between the top of the
bodywork and the ceiling is 1200 mm.
1.
=
=
=
pressure drop (recommended maximum = 0.1

bar)
length of outlet pipe in m
inner diameter of the outlet pipe in mm
absolute pressure at the compressor outlet in
bar(a)
free air delivery of the compressor in l/s
=
dP
_______________________
30 x C x p x Q
17
As a rule of thumb, following formula can be used to

calculate the recommended volume of the air net:
It is recommended that the connection of the compressor

air outlet pipe is made on top of the main air net pipe to
minimize carry-over of possible remainder of
condensate.
Qc =
L
d
P
dp =
Fig. 6f. Dimension drawing GA W 200 up to -315
2.2 Installation proposal (Fig. 7)
Instruction book
18
Fig. 7. Installation proposal
2920 1251 02
Instruction book
required ventilation capacity in m /s

shaft input of compressor in kW
temperature increase in compressor room
Fit manual condensate drain valve (Dma-Fig. 8). Lay

out the drain piping from valve (Dma) and from
automatic drain outlet (Daa) towards the condensate
collector. The drain pipes must not dip into the water
of the drain collector. For draining of pure condensate
water, install an oil/water separator. See section 1.1. It
is recommended to provide a funnel to allow visual
inspection of the condensate flow.
If cooling air ducts are installed, the maximum allowable

pressure drop over the ducts is 30 Pa. The maximum
pressure drop depends on the ambient temperature. The
fan capacity should match the compressor fan capacity
at a pressure head equal to the pressure drop caused by
the cooling air outlet ducts. Consult Atlas Copco.
Qv =
N =
dT =
For proposals 1 and 3: Qv = 0.92 N/dT
The required ventilation to limit the compressor room

temperature can be calculated as follows:
The inlet grids and ventilation fan should be installed in

such a way that any recirculation of cooling air to the
compressor or dryer (optional) is avoided. The air
velocity to the grids is limited to 5 m/s.
Recommended air net volume (sum of receiver volume

and volume of pipe net) = 2900 l. Consult Atlas Copco
if in any doubt.
2920 1251 02
5.
4.
0.10
0.15
0.20
0.25
0.20
0.15
0.10
0.9
0.8
0.7
0.5
0.3
0.2
0.1
Example: air consumption = 360 l/s

compressor air delivery = 450 l/s
inlet pressure = 1 bar absolute
unloading pressure = 7.5 bar(e)
loading pressure = 6.8 bar(e)
=
=
=
recommended air net volume in l

pressure difference between unloading and
loading pressures in bar (recommended
minimum = 0.6)
compressor inlet pressure in bar absolute
free air delivery of compressor in l/s
correction factor, see below
Air consumption divided

by compressor air delivery
p
Q
C
V =
dP =
Instruction book
2
Daa
50751F
3x240 + 120
2x (3x95 + 50)
2x (3x150 + 95)
2x (3x185 + 95)
---
220/240 V
3x240 + 120
2x (3x120 + 70)
2x (3x150 + 95)
2x (3x240 + 120)
---
220/240 V
20
19
2x (3x120 + 70)
2x (3x150 + 95)
-----
220/230 V
90
110
160
200
250
315
See section 2.3 for the recommended size of the supply

cables. Check that the electrical connections correspond
to the local codes. The installation must be earthed and
protected against short circuits by fuses in all phases.
An isolating switch must be installed near the
compressor.
7.
Compressor type
3x120 + 70
3x185 + 95
2x (3x95 + 50)
2x (3x120 + 70)
2x (3x150 + 95)
2x (3x185 + 95)
Mains + earth cable in mm2

380 V
3x95 + 50
3x150 + 95
3x185 + 95
3x240 + 120
2x (3x120 + 70)
2x (3x150 + 95)

380/415 V
3x95 + 50
3x150 + 95
3x185 + 95
3x240 + 120
2x (3x120 + 70)
2x (3x150 + 95)

380/415 V
2.3.3 GA/GA W - 60 Hz (except for Canada/USA)
90
110
132
160
200
250
Compressor type
2.3.2 GA W - 50 Hz
Position of Elektronikon control panel.
For GA W, fit a valve in the compressor water inlet

pipe and outlet pipe. Also provide water drain valves.
Remove the plastic plugs (if provided) from compressor
water pipes (4 and 7-Fig. 8) and connect the pipes to
the cooling water circuit.
GA W only
90
110
132
160
200
250
Compressor type
2.3.1 GA - 50 Hz
Remarks
The size is valid for cable PVC 70C at ambient 40C
according to EN60204, except for 60 Hz compressors for
Canada and USA: cable PVC 90C at ambient 40C
according to CE code Part I Tables 2, 5A, 17 and rules
28-106, 28-108, 28-110.
Local regulations remain applicable if they are stricter than
the values proposed below.
The voltage drop must not exceed 5% of the nominal
voltage. It may be necessary to use cables with a larger
section than those stated to comply with this requirement.
The connections are shown on Figs. 9
2.3 Electric cables
6.
1)
Automatic condensate drain outlet

Manual condensate drain valve
Pictograph, manual condensate drain
Pictograph, automatic condensate drain
Location of air outlet valve
Cooling water inlet 1)
Pictograph, cooling water inlet 1)
Pictograph, cooling water outlet 1)
Cooling water outlet 1)
Dma
Fig. 8. Air outlet and condensate drain outlets
Daa.
Dma.
1.
2.
3.
4.
5.
6.
7.
3x120 + 70
3x150 + 95
3x240 + 120
2x (3x95 + 50)
2x (3x120 + 70)
2x (3x150 + 95)
440/460 V
3x70 + 35
3x95 + 50
3x120 + 70
3x150 + 95
3x240 + 120
2x (3x95 + 50)
500 V
3x70 + 35
3x95 + 50
3x120 + 70
3x180 + 95
3x240 + 120
2x (3x95 + 50)
500 V
2920 1251 02
Instruction book
2920 1251 02
Instruction book
Fig. 9a IEC/VDE
21
22
Fig. 9b 60 Hz CSA/UL
Figs. 9. Electrical connections (typical examples)
2920 1251 02
Instruction book
22
20
19
15
12
21 18
10
Check valve
Oil separator
Coolers
Condensate trap
Outlet
Oil filter
Air filter
Valve
By-pass valve
Compressor element(s)
16
10
17
50753F
1) On earlier production units only
13
14
15
16
17
18
19
20
21
22
Fig. 10a. Pictographs on control panel
13 14
Automatic operation
Voltage on
Start
Stop
Compressor locked (in off position)
Local control
Remote control (by external switches)
Remote control (by computer)
Emergency stop
Keys to scroll through display
Key to go to next field on display
Alarm
2920 1251 02
1
2
3
4
5
6
7
8
9
10
11
12
3xAWG00 + AWG4
3xAWG4/0 + AWG2
3xMCM300 + AWG0
2x (3xAWG00 + AWG4)
2x (3xAWG3/0 + AWG2)
575 V
11
S2
S5
23
Following pictographs are provided below control panel (Fig.

10a) 1):
3xMCM250 + AWG0
3xMCM300 + AWG0
2x (3xAWG00 + AWG4)
2x (3xMCM250 + AWG0)
2x (3xMCM350 + AWG0)
440/460 V
Following pictographs are provided on control panel (Fig. 10a):
2.4 Pictographs
90
110
160
200
250
315
Compressor type
2.3.4 GA/GA W - 60 Hz compressors for Canada/USA
Instruction book
Water outlet
Manual condensate drain
Water inlet
Automatic condensate drain
Switch off voltage and depressurize compressor before
maintenance or repair
Torques for iron (Fe) or brass (CuZn) bolts
Oil gasket, screw on filter and then tighten by hand (approx.
one half turn)
Before connecting compressor electrically, consult
Instruction book for motor rotation direction
Consult Instruction book before greasing
Switch off voltage before removing protecting cover inside
electric cubicle
Consult Instruction book before maintenance or repair
24
For GA W, following requirements are given as a general rule

to prevent cooling water problems. If in any doubt, consult
Atlas Copco.
2.5 Cooling water requirements
33
31
32
30
28
29
23
24
25
26
27
Figure 10b shows pictographs which may be stuck on or inside

the bodywork:
< 600
< 400
< 3000
< 10
< 4
< 0.5
< 0.5
< 0.2
< 0.1
< 3
50-1000
< 25
< 150
< 250
< 750
< 10
< 2
< 0.5
< 0.5
< 0.2
< 0.1
< 3
50-500
< 10
Recirculating Open
system
system
2920 1251 02
Remarks
No algae nor oil.
Chloride and sulphate are interactive. In open systems
the sum of the squares of these values must not exceed
85,000. For recirculating systems with proper controls
and treatment, the sum of the squares may be up to 520,000.
Note that the sulphate value must include any sulphite
present.
Chloride (Cl-) . . . . . . . . . . . . . . . .
Sulphate (SO4--) . . . . . . . . . . . . . .
Total solids . . . . . . . . . . . . . . . . . .
Suspended solids (as SiO2) . . . . . .
Free chlorine (Cl2) . . . . . . . . . . . .
Ammonia (NH4+) . . . . . . . . . . . . .
Copper . . . . . . . . . . . . . . . . . . . . .
Iron . . . . . . . . . . . . . . . . . . . . . . . .
Manganese . . . . . . . . . . . . . . . . . .
Oxygen . . . . . . . . . . . . . . . . . . . . .
Carbonate hardness (as CaCO3) . .
Organics (KMnO4 Consumption) .
Recommended maxima - mg/l
Fig. 10b. Pictographs on/inside bodywork
Instruction book
Consult section 2 for the electric cable size, installation

proposal and dimension drawings.
Read the "User manual for Elektronikon regulator" to
familiarize yourself with all regulator functions.
A sticker dealing in short with the operation instructions
is delivered with the literature set. Affix the sticker next
to the control panel.
Stick labels near the control panel warning the operator
that:
- the compressor may automatically restart after voltage
failure
- the compressor is automatically started and stopped
- the compressor may be remotely controlled
See section 1.2.
The gear casing supports and motor support are secured
to the frame, immobilizing the vibration dampers during
transport. Remove stud and nuts (3-Fig. 11a) of both gear
casing supports as well as bushes (1-Fig. 11b) of the motor
support.
Check the wires at transformer (T1-Fig. 2) for correct
connection, the settings of overload relay (F21) and circuit
breakers (Q15/16) 1), and that overload relay (F21) is set
for automatic resetting (indicated on the relay by "A").
See section 7.4.
2920 1251 02
1) GA90 and -110 have one fan motor and circuit breaker, GA132
up to -315 have two fan motors and circuit breakers.
6.
5.
4.
3.
2.
1.
3.1 Preparation for initial start-up
Moving/lifting
The compressor can be moved by a lift truck using the slots in
the frame. Make sure that the forks protrude from the other
side of the frame. The compressor can also be lifted after
inserting beams in the slots. Make sure that the beams cannot
slide and that they protrude from the frame equally. The chains
must be held parallel to the bodywork by chain spreaders in
order not to damage the compressor. The lifting equipment
must be placed in such a way that the compressor will be lifted
perpendicularly. Lift smoothly and avoid twisting.
Outdoor/altitude operation
If the compressor is installed outdoors or if the air inlet
temperature can be below 0C (32F), precautions must be
taken. In this case, and also if operating at high altitude, consult
Atlas Copco.
Safety precautions
The operator must apply all related safety precautions including
those mentioned in this book.
3 OPERATING INSTRUCTIONS
Instruction book
Compressor element
Drive motor
Bush, to be removed
Vibration damper
Stud and nut, to be removed
Vibration damper
Fig. 11b Motor side
Fig. 11a Gear casing side
Figs. 11. Transport fixations
E.
M1.
1.
2.
3.
4.
3
4
50320F
50319F
25
On GA W also:
Open the water inlet valve and outlet valve (customer's
installation).
Opening of the water outlet valve can be overlooked if,
after previous operation, the setting of this valve has not
been disturbed.
Switch on the voltage. Voltage on LED (2-Fig. 3a) lights

up.
Close condensate drain valve (Dma-Fig. 8).
Open air outlet valve (3-Fig. 8).
Check oil level indicator (Gl-Fig. 1a): the pointer should
be in the green range or orange range. 3)
Press start button (8). The compressor starts running in

unloaded condition. Automatic operation LED (1) lights
up.
26
1.
3.3 Routine starting (Fig. 3a)
5.
2.
3.
4.
1.
Attention
The operator must apply all relevant safety precautions,
including those mentioned in this instruction book.
In case the water system was drained (see section 3.7),
close the drain valves and fit the drain plugs.
3.2 Before starting
Remove filler plugs (FC2-Fig. 1b). Pour approx. 1 l

(0.25 US gal) of oil into the compressor elements (use
the bottle with Roto-injectfluid which is delivered with
the compressor). Reinstall the plugs. 1)
8. Close drain valve (Dma-Fig. 8).
9. For GA W, Check that the cooling water drain valves
(customer's installation) in the inlet and outlet lines are
closed. Open the water inlet valve and outlet valve
(customer's installation) and check for water flow.
10. Check that the compressor is filled with oil: the pointer
of oil level indicator (Gl-Fig. 1a) should be in the green
range or orange range.
11. Switch on the voltage. Start the compressor and stop it
immediately. Check the rotation of drive motor (M1-Fig.
14a), and on GA also of fan motors (M2/3-Fig. 14a). 2)
When facing the drive end shaft of the motors, the correct
rotation direction is counter-clockwise for both the drive
motor and the fan motors.
- First check the drive motor. If the rotation direction is
wrong, switch off the voltage and reverse two incoming
electric lines.
- Check fan motor (M2). If necessary, switch off the
voltage and reverse two incoming connections at the
terminals of circuit breaker (Q15-Fig. 2).
- Check fan motor (M3). 2) If necessary, switch off the
voltage and reverse two incoming connections at the
terminals of circuit breaker (Q16-Fig. 2).
7.
On GA W also:
Regulate the cooling water flow with the compressor
running loaded. Adjust the water flow to obtain the most
suitable air temperature at the element outlet, i.e. between
2C and 7C above the relevant temperature in Fig. 12.
Approx. 10 seconds later (programmable), the compressor

starts running loaded. The message on display (4) changes
from <<Automatically unloaded>> to <<Automatically
loaded>>.
2920 1251 02
1) GA/GA W 90 up to -160 are equipped with one compressor

element and unloader, all other types have two compressor
elements and unloaders.
2) GA90 and -110 have one fan motor and circuit breaker, GA132
up to -315 have two fan motors and circuit breakers.
3) If the compressor has only just stopped, wait one minute before
checking the level.
If the function 'automatic restart after voltage failure' is activated

(see section 1.2.1.4) and the duration of repair is shorter than
the programmed power recovery time, reset the display after
remedying the fault: press key <<Reset>>, the message <<All
protection functions are OK>> will appear whereafter the
compressor can be restarted. Press keys <<Menu>> and
<<Main Screen>> to return to the main display (Fig. 3b).
Press emergency stop button (S2) (if not yet done), switch off
the voltage and then depressurize the compressor. After
remedying the fault, the compressor can be restarted as
described above.
3.4 Starting after emergency stop or shutdown (Fig. 3a)
Attention
For optimum operation, the cooling water outlet
temperature must never exceed the value specified in
section 7.5.2.
Consult Atlas Copco if condensate should be formed
during frequent unloading periods.
3.
2.
Important
If the oil injection pressure at the compressor elements is
too high during starting, the compressor will not start. See
section 1.2.1.5.
In automatic operation, the regulator limits the number of
motor starts. Wait 20 minutes in case of manual restarting.
Instruction book
2920 1251 02
Important
If the compressor is stopped, it may start automatically.
See also section 1.2.1.
The regulator will only react to a new control mode if the
new position of key (S5) is maintained for 3 seconds.
To avoid unauthorized switching over to another control
mode, take out key (S5) after selecting the required mode.
See also section 1.2.3.
4.
2.
3.
27
1) If the <<Load>> or <<Unload>> function is not indicated on the

bottom line of display (4), press key <<Menu>> (5) until function
<<Main Screen>> appears above key (F1), then press key
<<Main Screen>>.
3.
2.
Regularly check the display for readings and messages.

Normally, the main display (Fig. 3b) is shown, indicating
the compressor outlet pressure, the status of the compressor
and the functions of the keys below the display.
Always check the display and remedy the trouble if alarm
LED (3) is alight or blinks. See section 1.2. Also consult
the "User manual for Elektronikon regulator", section
"Submenu STATUS DATA".
The display will show a service message if one of the
monitored components is to be serviced; replace the
component, change the oil or grease the drive motor as
the case may be. Reset the relevant timer. Consult the
"User manual for Elektronikon regulator", "Submenu
SERVICE".
1.
1.
When automatic operation LED (1) is alight, starting and

stopping of the motor is controlled automatically.
Check the readings on display (4). See below.
On reaching the pre-set unloading pressure, shown on
display (4), the compressor will run unloaded. The
operation of the compressor is automatically controlled
by the regulator depending on the air consumption.
To unload the compressor manually, press key
<<Unload>> (5) 1). To put the compressor back into
automatic operation, press key <<Load>> (5) 1).
3.5.1 Checking the display (4-Fig. 3a)
3.5 During operation (Fig. 3a)
Fig. 12. Minimum allowable air temperature at outlet of compressor elements (for GA W)
According to the table, the minimum allowable temperature at the outlet of the compressor elements is 68C.
Regulate the cooling water flow during loading to obtain a temperature between 70C and approx. 75C at the outlet of the
compressor elements
Example:
Ambient temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20C
Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 %
Working pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 bar(e)
Instruction book
Regularly press key <<Show More>> (5-Fig. 3a) 2) to

call up information about the actual compressor condition:
- the status of controlling the compressor (automatic or
manual, local or remote)
- the status of the compressor start/stop timer (active or
not active) 1)
- the maximum allowable unloading pressure
- the compressor outlet pressure
- the pressure drop over the air filters
- the pressure difference over the oil separator
- the oil injection pressure at compressor element 1 3)
- the compressor outlet temperature
- the outlet temperature at compressor element 1 3)
- the cooling air inlet temperature (on GA) or cooling
water outlet temperature (on GA W)
- the status of the overload protection of both the drive
motor and fan motor (normal or not)
- the total running and loading hours
28
Manually loading
Press key <<Load>> (5). LED (1) lights up. The command
<<Load>> does not force the compressor in loaded condition,
but it will switch the compressor to automatic operation again:
the compressor will be loaded if the air net pressure drops below
the programmed level.
Manually unloading
Press key <<Unload>> (5). LED (1) goes out. The message
<<Manually Unloaded>> appears on the display.
If required, the compressor can be unloaded manually. In this

case, the compressor is switched out of automatic operation:
the compressor remains running unloaded unless it is loaded
again manually.
Normally, the compressor runs in automatic operation, i.e. the

electronic regulator loads, unloads, stops and restarts the
compressor automatically. LED (1) is then alight.
3.6 Manual unloading/loading (Fig. 3a) 4)
4.
Notes
- Whenever a warning, service request, sensor error or
motor overload message is displayed, the free spaces
on the display between function keys (5-Fig. 3a) are
filled with blinking indicators (***).
- When more than one message needs to be displayed (e.g.
both warning and service), the messages will be
displayed one after the other for 3 seconds.
Warning
Before carrying out any maintenance, repair or adjustment,
stop the compressor, press emergency stop button (S2Fig. 3a), switch off the voltage and depressurize the
compressor.
Press stop button (9). LED (1) goes out. The message
<<Programmed stop>> appears. The compressor runs
unloaded for 30 seconds and then stops.
To stop the compressor in case of emergency, press
button (S2). Alarm LED (3) blinks. After remedying the
fault, unlock the button by turning it anticlockwise.
Close air outlet valve (3-Fig. 8).
Open condensate drain valve (Dma-Fig. 8).
On GA W, close the water inlet valve.
On GA W, if the compressor is installed in a room
where freezing temperatures are expected, drain the
cooling system completely:
- by opening the drain valves in the water inlet and outlet
pipes (customer's installation)
- by removing drain plugs (DP6-Fig. 14b)
Switch off the voltage.
Stop the compressor and close the air outlet valve.

Switch off the voltage and disconnect the compressor from
the mains.
Depressurize the compressor by opening valve (Dma-Fig.
8) and loosening plug (FC1-Fig. 1a) one turn.
Shut off and depressurize the part of the air net which is
connected to the outlet valve. Disconnect the compressor
air outlet pipe from the air net.
Drain the water, oil and condensate circuits.
Disconnect the compressor condensate piping from the
condensate drain net.
Disconnect the cooling water pipes from the compressor.
2920 1251 02
1) The compressor is automatically started and stopped if these start/

stop commands are programmed and activated; consult section
1.2.1.1.
2) If function <<Show More>> is not indicated on the bottom line
of display (4-Fig. 3a), press key <<Menu>> (5) until function
<<Main Screen>> appears above key (F1), then press key <<Main
Screen>>.
3) GA/GA W 90 up to -160 have one compressor element; GA/GA
W 200 up to -315 have two elements (element 1 stands for the
element at the outer side).
4) If the <<Load>> or <<Unload>> function is not indicated on the
bottom line of display (4), press key <<Menu>> (5) until function
<<Main Screen>> appears above key (F1), then press key
<<Main Screen>>.
7.
5.
6.
4.
3.
1.
2.
At the end of the service life of the compressor, proceed as

follows:
3.8 Taking out of operation
Important
After pressing stop button (9), the compressor will run
unloaded for 30 seconds. The compressor stops after this
period. A start command during this time is ignored.
After stopping, the compressor is prevented from restarting
within a programmable time (20 seconds). A start
command given during this minimum stop time will be
memorized; automatic operation LED (1) lights up. The
compressor will start when the minimum stop time has
run out.
7.
3.
4.
5.
6.
2.
1.
3.7 Stopping (Fig. 3a)
Instruction book
----500
500
2000
4000
2000
------
--
--
8000
3-monthly
"
"
"
"
"
Yearly
"
"
"
"
"
"
"
"
"
2-Yearly
2920 1251 02
2)
--
--
--
4.5/4.7
--4.7/5.1
5.3
--
4.3/4.4/4.7
4.3/4.4/4.7
5.3
---5.2
5.1
3.5/7.1
--
Consult
section
--
--
2
6
5
2
7
--
---4
-1
---
See
note
Have oil separator element replaced
Replace oil filters

Carry out a LED/display test
Have all flexibles inspected
Replace air filters
Have safety valves tested
Have the compressor inspected by an Atlas Copco Service
representative
Have operation of sensors, electrical interlockings and components
tested by an electrician
Check restrictor (Rf2) and also restrictor upstream of oil stop valve
(Vs) for cleanness
For GA/GA W 7.5/10 bar and 100/125/150 psi

When Atlas Copco Roto-injectfluid is used, change oil
For GA/GA W 13 bar and 200 psi

When Atlas Copco Roto-injectfluid is used, change oil
Operate safety valve (SV)

Remove, dismantle and clean float valve of moisture trap (MTa)
Clean compressor
Check for possible leaks
Check coolers (Ca and Co); clean if necessary
Remove air filters (AF) and inspect
Check readings on display

Check that condensate is discharged (Daa) during loading
Operation
29
Use only authorized parts. Any damage or malfunction caused by the use of unauthorized parts is not covered by
Warranty or Product Liability.
Whichever interval comes first. The local Atlas Copco Sales Company may overrule the maintenance schedule, especially
the service intervals, depending on the environmental and working conditions of the compressor.
---
Daily
"
1)
Running
hours 2)
Period 2)
The "longer interval" checks must also include the "shorter interval" checks.
In servicing, replace all removed gaskets, O-rings and washers.
The schedule contains a summary of the maintenance instructions. Read the related section before taking maintenance measures.
4.1 Preventive maintenance schedule for the compressor 1)
Take precautions to avoid an accidental restart. Apply all relevant safety precautions, including those mentioned in this book.
Warning
Before carrying out any maintenance or repair, press stop button (9-Fig. 3a), wait until the compressor has stopped (approx. 30
seconds) and then press emergency stop button (S2). Switch off the voltage and depressurize the compressor.
4 MAINTENANCE
Instruction book
Run the compressor until warm. Stop the compressor and
30
1.
4.4 Oil change (Figs. 1a, 13 and 14b)
Notes
Never mix oils of different brands or types.
It is strongly recommended to use Atlas Copco Roto-injectfluid.

This oil has a long service life and ensures optimum lubrication.
4.3.1 Roto-injectfluid
4.3 Oil specifications
The bearings must be regreased every 4000 operating hours with

a lithium-soap-based grease according to DIN 51 825 K3k.
Quantity: 50 g (1.7 oz) per bearing. The lubrication points are
marked.
Stop the compressor before greasing.
4.2.2 Drive motor (M1-Fig. 1a)
GA132 up to -315 have two fan motors (M2 and M3-Fig.

14a). GA90 and -110 have one fan motor (M2). The bearings
of the motors must be replaced after 25,000 operating hours.
4.2.1 Fan motors (GA only)
4.2 Motors
Stop the compressor, switch off the voltage and

depressurize by unscrewing plug (FC1) only one turn to
permit any pressure in the system to escape.
Remove oil filters (OF).
2920 1251 02
1) See "User manual for Elektronikon regulator", section "Submenu

SERVICE".
2) On GA/GA W 200 up to -315 one plug for each valve.
3) Two plugs on GA W 132 up to -315.
2.
1.
4.5 Oil filter change (Figs. 1)
6.
5.
4.
3.
2.
switch off the voltage. Wait a few minutes and

depressurize by unscrewing plug (FC1) only one turn to
permit any pressure in the system to escape.
Drain the oil by removing the drain plugs. Plugs are
provided on the air receiver (DP1), oil stop valve (DP2)
2), check valve (DP3) 2), oil cooler (DP4) 3) and gearbox
(DP5). Tighten the plugs after draining.
Remove filler plug (FC1). Fill the air receiver with oil
until the level reaches the filler neck. Reinstall and
tighten plug (FC1).
Run the compressor loaded for a few minutes to allow
the oil cooler by-pass valve(s) to open. Stop the
compressor and wait a few minutes.
Depressurize the system by unscrewing plug (FC1) only
one turn to permit any pressure in the system to escape.
Remove filler plug (FC1). Fill the air receiver with oil
until the level reaches the filler neck. Tighten plug (FC1).
Reset the oil service warning using key <<Reset>> in
submenu <<Service>>. 1)
Notes
1. In very dusty surroundings it may be necessary to check and replace the air filters more frequently. Consult Atlas Copco.
2. Use Atlas Copco filters.
3. The separator element must be replaced two-yearly or each 8000 running hours or when the pressure difference over the
element exceeds 0.8 bar (12 psi). Check the pressure drop when the compressor is running loaded and preferably with a
stable working pressure.
4. Any leak should be attended to immediately.
5. Damaged flexibles must be replaced immediately.
6. See "User manual for Elektronikon regulator", section "Submenu TEST".
7. Preferably to be carried out by an Atlas Copco Service representative.
8. If the outlet temperature of the compressor elements should be continuously higher than 100C (212F), consult Atlas
Copco.
Instruction book
AF
2920 1251 02
FN2
Fig. 14a GA
M2
M1
FN3 Ca
M3
DP2 Vs E
AV
Co
Check valve
Oil drain plug, oil stop valve
Oil drain plug, check valve
Oil drain plug, gear box
Compressor element
Oil stop valve
Fig. 13. Compressor element
CV.
DP2.
DP3.
DP5.
E.
Vs.
DP3 CV
Instruction book
50318F
50317F
MTa
DP5
Clean the filter seats on the manifold. Oil the gaskets of

the new filters and screw them into place until the gaskets
contact their seats, then tighten by hand.
Tighten filler plug (FC1).
Reset the oil filter service warning using key <<Reset>>
in submenu <<Service>>. 1)
Air filter
Air outlet valve
Air cooler
Oil cooler
Oil drain plug
Water drain plugs
FN2/3.
Fans
M1. Drive motor
M2/3. Fan motors
MTa. Moisture trap
1.
Bolt
2.
Air outlet pipe
Fig. 14b GA W
Figs. 14. Drive motor and coolers (typical examples)
AF.
AV.
Ca.
Co.
DP4.
DP6.
50321F
DP4
DP6
DP6
M1
Ca
Co
31
1) See "User manual for Elektronikon regulator", section "Submenu

SERVICE".
If the compressor is going to be stored without running from

time to time, protective measures must be taken. Consult Atlas
Copco.
Run the compressor, e.g. twice a week, until warm. Load and
unload the compressor a few times to operate the components
of the unloading/loading system.
4.6 Storage after installation
4.
5.
3.
Ordering number
2906 0170 00
2906 0199 00
2906 0285 00
2906 0288 00
Ordering number
Ordering number
2901 0522 00
2901 0045 01
Stop the compressor and switch off the voltage. Remove

the filters. 2)
Fit the new filters. Take care to fit the filters straight as
shown in Fig. 15.
Reset the air filter service warning using key <<Reset>>
in submenu <<Service>> 3).
32
On GA, unscrew bolts (1-Fig. 14a) and rotate the fans away
from the cooler block. Blow air from the compressor element
compartment through the coolers towards the drive motor
compartment. Remove any dirt. Reposition and fix the fans.
Make sure that the fans rotate freely.
Keep the coolers clean to maintain the cooling efficiency.
5.2 Coolers
3.
2.
1.
5.1 Air filters
5 ADJUSTMENTS AND SERVICING

PROCEDURES
Quantity
20 litre can
209 litre drum
Atlas Copco Roto-injectfluid

Atlas Copco Roto-injectfluid (see section 4.3.1) can be ordered
in following quantities:
Service kit for oil filters and

heavy-duty air filters
For GA/GA W 90 up to -160
For GA/GA W 200 up to -315 1)
Service kit for oil filters and air filters Ordering number
2906 0092 00
2906 0200 00
Service kit for oil filters

Service kits
Service kits comprise all parts needed for servicing components
and offer the benefits of genuine Atlas Copco parts while
keeping the maintenance budget low. All service kits are
mentioned in the relevant Parts Lists.
4.7 Service kits
Filter
Filter chamber
Air inlet pipe
2920 1251 02
1) On 13 bar and 200 psi compressors, consult the relevant Parts

Lists for the part numbers of the filters
2) One filter on GA/GA W 90 up to -160, two filters on GA/GA W
200 up to -315.
3) See "User manual for Elektronikon regulator"
Warning
Never run the compressor without safety valves.
No adjustments are allowed.
Testing
The valve can be tested on a separate compressed air line. If
the valve does not open at the pressure specified in section 7.3,
consult Atlas Copco.
Operating
Operate the safety valve by unscrewing the cap one or two turns
and retightening it.
5.3 Safety valve (SV-Fig. 1a)
On GA W, consult Atlas Copco for cleaning.
Note
If it should be necessary to wash the coolers with a cleansing
agent, consult Atlas Copco.
Fig. 15 Correct position of air filter
1.
2.
3.
Instruction book
A shut-down warning message appears on the display

LED (3-Fig. 3a) will light up indicating that the
temperature at the outlet of the compressor element is too
high. See below. The message disappears as soon as the
cause of the trouble is remedied
Unit is shut-down
LED (3-Fig. 3a) will blink indicating either that the outlet
temperature is too high (see below) or that the motor
overload relay has tripped. Consult the "User manual for
Elektronikon regulator" to remedy the trouble and to reset
the message (section "Submenu STATUS DATA")
Condensate is not discharged from moisture trap

during loading
a. Discharge pipe clogged
a. Check and correct as necessary
b.Float valve malfunctioning
b.Remove float valve assembly, clean and check
Compressor air delivery or pressure below normal

a. Air consumption exceeds air delivery of compressor
a. Check equipment connected
b.Choked air filters (AF)
b.Replace filters
c. Leaks in control air flexibles
c. Replace flexibles
d.Air leakages
d.Check and correct
Element outlet or delivery air temperature above

normal
a. On GA, insufficient cooling air or cooling air
temperature too high
a. Check for cooling air restriction. Improve ventilation
of compressor room. Avoid recirculation of cooling air
b.On GA W, cooling water temperature too high or flow
too low
b.See section 7.5.2. Increase water flow
2.
3.
4.
5.
6.
2920 1251 02
A service message appears on the display

Replace the indicated component or grease the drive motor
as the case may be. Consult the "User manual for
Elektronikon regulator" to remedy the trouble and to reset
the message (section "Submenu SERVICE")
1.
Faults and suggested remedies
Take precautions to avoid an accidental restart. Apply all

relevant safety precautions, including those mentioned in this
book.
Warning
Before carrying out any maintenance or repair, press stop
button (9-Fig. 3a), wait until the compressor has stopped
(approx. 30 seconds) and then press emergency stop button
(S2). Switch off the voltage and depressurize the compressor.
6 PROBLEM SOLVING
Instruction book
33
A number of regulation settings (e.g. loading and unloading

pressures), protection settings (e.g. shut-down level for the
compressor element temperature) and service settings (e.g.
oil service life) are programmable. The "User manual for
Elektronikon regulator" deals elaborately with this matter
(section "Submenu MODIFY SETTINGS").
7.2 Programmable settings
Maximum unloading pressure See section 7.5.3 up to 7.5.15

Compressor outlet pressure . . Depends on programmed
unloading and loading
pressures
Pressure drop over air filter . . Below 0.050 bar
Pressure difference over oil
separator . . . . . . . . . . . . . . . . . Below 0.8 bar
Oil injection pressure at
compressor element 1 . . . . . . . Depends on programmed
unloading and loading
pressures
Compressor outlet
temperature . . . . . . . . . . . . . . . See section 7.5.3 up to 7.5.15
Compressor element 1
outlet temperature . . . . . . . . . . Between 70C and 100C
Cooling air inlet
temperature (on GA) . . . . . . . Below 40 C
Cooling water
temperature (on GA W) . . . . . Below 50 C
The readings below are valid when operating at reference

conditions (section 7.5.1):
Normally the main display (Fig. 3b) is shown, indicating the

actual air outlet pressure and the actual compressor status. The
key <<Show More>> allows the operator to call up other
information about the condition of the compressor (see section
3.5.1).
7.1 Readings on display
7 PRINCIPAL DATA
c. Oil level too low

c. Check and correct as necessary
d.Oil cooler (Co) clogged
d.Consult Atlas Copco
e. Air cooler (Ca) clogged
e. Consult Atlas Copco.
f. On GA W, restriction in cooling water system due to
dirt or formation of scale
f. Consult Atlas Copco
12 bar(e) for 7.5 bar, 10 bar, 100 psi, 125 psi and 150 psi versions
15 bar(e) for 13 bar and 200 psi versions
280SMA-4
280SMA-4
280SMA-4
315SA-4
315SA-4
315SA-4
315SMB-4
315SMB-4
315SMB-4
315MB-4
315MB-4
315MB-4
315LA-4
315LA-4
355MA-4
355MA-4
Motor type
M2CA
230
400
500
230
400
500
230
400
500
230
400
500
400
500
400
500
Supply voltage
(V)
189
107
82
233
133
100
274
159
121
339
191
145
230
178
292
223
Max. setting
of overload
relay F21 (A)
2x (3x200)
3x200
3x200
2x (3x300)
2x (3x160)
3x200
2x (3x315)
2x (3x200)
3x224
2x (3x355)
2x (3x224)
2x (3x160)
2x (3x315)
2x (3x315)
2x (3x315)
2x (3x250)
Max. fuse ratings

IEC Class gL/gG
Type 2 2)
(A)
220/230
380
440/460
575
220/230
380
440/460
575
90
90
90
90
110
110
110
110
204
119
102
79
257
149
129
98
Max. setting
overload
relay
F21 (A)
2x (3x250)
3x224
3x200
-2x (3x315)
2x (3x160)
2x (3x160)
--
IEC Class
gL(gG)
(A)
Type 2 2)
3x500
---3x500
3x315
3x315
--
2x (3x250)
-3x200
3x200
2x (3x300)
-2x (3x175)
3x200
Max. fuse ratings

IEC Class
CSA HRC
gL(gG)
(A)
(A)
Type 1 2)
3x500
3x500
3x315
3x500
3x355
3x800
3x400
3x315
3x500
3x500
3x500
3x500
34
2920 1251 02
2x (3x250)
-3x175
3x175
3x300
-3x175
3x175
UL Class K5
(A)
Max. fuse ratings

IEC Class gL/gG
Type 1 1)
(A)
1) Disturbance or destruction of contactor and/or overload relay may occur (if damaged, the component must be replaced)
2) No damage will occur at the overload relay
445MB-4
445MB-4
445MB-4
445MB-4
505MA-4
505MA-4
505MA-4
505MA-4
Supply
voltage
(V)
GA/GA W Motor
Compressor Type
type
MC2A
7.4.2 Motor overload relay and fuses for GA/GA W - 60 Hz with ABB motors
90
90
90
110
110
110
132
132
132
160
160
160
200
200
250
250
GA/GA W
Compressor type
7.4.1 Motor overload relay and fuses for GA/GA W - 50 Hz with ABB motors
7.4 Settings of overload relay, circuit breakers and fuses
Important
Some compressors with a specific approval have valves with other settings. Always consult the data stamped on the valve or
consult Atlas Copco.
7.3 Settings of safety valves
Instruction book
380
440/460
575
380
440/460
575
380
440/460
575
380
440/460
575
160
160
160
200
200
200
250
250
250
315
315
315
197
169
129
240
203
157
288
253
194
319
279
216
Max. setting
overload
relay
F21 (A)
2x (3x224)
2x (3x200)
-2x (3x315)
2x (3x315)
-2x (3x315)
2x (3x300)
-2x (3x315)
2x (3x315)
--
IEC Class
gL(gG)
(A)
Type 2 1)
3x 500
3x 400
-3x500
3x500
-3x 500
3x500
-3x630
3x500
--
-2x (3x200)
2x (3x175)
-2x (3x250)
2x (3x250)
-2x (3x300)
2x (3x250)
-2x (3x300)
2x (3x250)
Max. fuse ratings

IEC Class
CSA HRC
gL(gG)
(A)
(A)
Type 1 1)
-2x (3x200)
2x (3x175)
-2x (3x250)
2x (3x250)
-2x (3x300)
2x (3x250)
-2x (3x300)
2x (3x250)
UL Class K5
(A)
1LA6 283-4
1LA6 283-4
1LA6 283-4
1LA6 288-4
1LA6 288-4
1LA6 288-4
1LA6 316-4
1LA6 316-4
1LA6 317-4
1LA6 317-4
1LA8 315-4
1LA8 315-4
1LA8 317-4
1LA8 317-4
90
90
90
110
110
110
160
160
200
200
250
250
315
315
440/460
575
440/460
575
440/460
575
440/460
575
220/230
440/460
575
220/230
440/460
575
Supply voltage
(V)
2920 1251 02
1) No damage will occur at the overload relay
Motor type
GA/GA W
Compressor type
281
215
243
184
205
156
163
125
243
125
98
208
103
79
Max. setting
of overload
relay F21 (A)
2x (3x300)
2x (3x250)
2x (3x300)
2x (3x250)
2x (3x250)
2x (3x250)
2x (3x200)
2x (3x175)
2x (3x300)
2x (3x175)
3x200
2x (3x250)
3x200
3x200
Max. fuse ratings

CSA HRC
(A)
2x (3x300)
2x (3x250)
2x (3x300)
2x (3x250)
2x (3x250)
2x (3x250)
2x (3x200)
2x (3x175)
3x300
3x175
3x175
2x (3x250)
3x175
3x175
Max. fuse ratings

UL Class K5
(A)
7.4.3 Motor overload relay and fuses for GA/GA W - 60 Hz with Siemens motors (USA/Canada only)
505MB-4
505MB-4
505MB-4
315LA-4
315LA-4
315LA-4
355MA-4
355MA-4
355MA-4
355LA-4
355LA-4
355LA-4
Supply
voltage
(V)
GA/GA W Motor
Compressor Type
type
MC2A
Instruction book
35
230
400
440
500
230
400
500
Supply voltage (V)
220/230
380
440/460
575
220/230
380
440/460
575
Supply voltage (V)
36
Maximum air inlet temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Minimum air inlet temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum effective working pressure . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum cooling water inlet temperature . . . . . . . . . . . . . . . . . . . . .
Maximum cooling water outlet temperature (open systems) . . . . . . . .
Maximum cooling water outlet temperature (recirculating systems) .
Maximum cooling water inlet pressure . . . . . . . . . . . . . . . . . . . . . . . .
7.5.2 Limitations
Absolute inlet pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Relative air humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air inlet temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nominal effective working pressure . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling water inlet temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.5.1 Reference conditions
7.5 Compressor specifications
90/160
90/160
90/160
90/160
200/315
200/315
200/315
200/315
GA Compressor type
7.4.5 Fan motor circuit breakers for GA - 60 Hz
90/160
90/160
90/160
90/160
200/250
200/250
200/250
GA Compressor type
7.4.4 Fan motor circuit breakers for GA - 50 Hz
C
C
bar(e)
C
C
C
bar(e)
bar(a)
%
C
bar(e)
C
40
0
see sections 7.5.3 up to 7.5.15
40
50
60
5
1
0
20
See sections 7.5.3 up to 7.5.15
20
11.5
6.6
6.3
4.5
20.3
11.7
10.4
8
2920 1251 02
Maximum setting of circuit breaker Q15 and Q16 (A)
12.5
7.2
6.6
5.4
15.8
9.1
7
Maximum setting of circuit breaker Q15 and Q16 (A)
Instruction book
--
1.8
2920 1251 02
1) At reference conditions (see section 7.5.1)

2) According to PNEUROP/CAGI at 1 m distance under free field conditions with a tolerance of 3 dB
3) For GA including cooling fans. Values may differ up to 0.5% depending on the supply voltage
--
28
1480
91
75
73
2.2
28
1485
111
75
74
2.8
30
1485
136
80
74
13
12.5
3.4
30
1485
166
80
74
13
12.5
37
10.8
10.3
27
1785
109
75
76
--
bar(e)
bar(e)
C
r/min
kW
l
dB(A)
l/s
--
10.8
10.3
28
1790
128
75
77
--
10.8
10.3
30
1790
173
80
78
160
--
9.1
8.6
30
1790
174
80
78
160
--
7.4
6.9
30
1790
176
80
78
160
2.0
10.8
10.3
28
1785
105
75
74
90 W
2.0
9.1
8.6
28
1785
104
75
74
90 W
2.0
7.4
6.9
28
1785
104
75
74
90 W
38

Maximum working pressure . . . . . . . . . .

Nominal working pressure . . . . . . . . . . .
Air temperature at outlet valve, approx.
Motor shaft speed . . . . . . . . . . . . . . . . . .
Power input 3) . . . . . . . . . . . . . . . . . . . .
Oil capacity . . . . . . . . . . . . . . . . . . . . . . .
Sound pressure level 2) . . . . . . . . . . . . .
Cooling water flow at temperature
rise of 10C . . . . . . . . . . . . . . . . . . . . . . .
--
30
1485
171
80
74
13
12.5
--
29
1485
141
80
74
13
12.5
110
28
1485
114
75
74
13
12.5
90
27
1480
93
75
73
13
12.5
160 W
13
12.5
132 W
--
13
12.5
110 W
--
l/s
9.1
8.6
28
1790
129
75
77
Maximum working pressure . . bar(e)

Nominal working pressure . . . bar(e)
Air temperature at outlet valve,
approx. . . . . . . . . . . . . . . . . . . C
Motor shaft speed . . . . . . . . . . r/min
Power input 3) . . . . . . . . . . . . kW
Oil capacity . . . . . . . . . . . . . . . l
Sound pressure level 2) . . . . . dB(A)
Cooling water flow at
temperature rise of 10C . . . . l/s
132
90 W
3.4
9.1
8.6
27
1785
108
75
76
bar(e)
bar(e)
C
r/min
kW
l
dB(A)
Compressor type
110
160
2.8
30
1485
165
80
74

Power input 3) . . . . . . . . . . . . . . . . . . . .
Oil capacity . . . . . . . . . . . . . . . . . . . . . . .
rise of 10C . . . . . . . . . . . . . . . . . . . . . . .
90
2.2
30
1485
137
80
74
10
9.5
Compressor type
1.8
28
1485
115
75
74
10
9.5
7.5.8 Specific data of GA/GA W 90 up to -160 150 psi - 60 Hz 1)
--
28
1480
93
75
73
10
9.5
7.5.5 Specific data of GA/GA W 90 up to -160 13 bar - 50 Hz
--
30
1485
170
80
74
10
9.5
110
--
29
1485
142
80
74
10
9.5
90
--
--
28
1485
118
75
74
--
l/s
7.4
6.9
28
1790
129
75
77
110
27
1480
96
75
73
10
9.5
160 W
3.4
7.4
6.9
27
1785
108
75
76
bar(e)
bar(e)
C
r/min
kW
l
dB(A)
90
10
9.5
160
132 W
2.8
30
1485
165
80
74

Power input 3) . . . . . . . . . . . . . . . . . . . .
Oil capacity . . . . . . . . . . . . . . . . . . . . . . .
rise of 10C . . . . . . . . . . . . . . . . . . . . . . .
Compressor type
10
9.5
132
110 W
2.2
30
1485
136
80
74
7.5
7
160 W

approx. . . . . . . . . . . . . . . . . . . C
Power input 3) . . . . . . . . . . . . kW
Oil capacity . . . . . . . . . . . . . . . l
110
90 W
1.8
28
1485
115
75
74
7.5
7
132 W
Compressor type
--
28
1480
94
75
73
7.5
7
110 W
90
--
30
1485
170
80
74
7.5
7
90 W
100 psi - 60 Hz 1)
Compressor type
--
--
29
1485
141
80
74
7.5
7
160
7.5.7 Specific data of GA/GA W 90 up to -160 125 psi - 60 Hz 1)
28
1485
118
75
74
27
1480
97
75
73
7.5
7
132
7.5 bar - 50 Hz 1)
7.5.4 Specific data of GA/GA W 90 up to -160 10 bar - 50 Hz 1)
7.5
7
7.5
7

approx. . . . . . . . . . . . . . . . . . . C
Power input 3) . . . . . . . . . . . . kW
Oil capacity . . . . . . . . . . . . . . . l
110
90
Compressor type
Instruction book
2.4
10.8
10.3
28
1790
124
75
75
110 W
2.4
9.1
8.6
28
1790
125
80
75
110 W
2.4
7.4
6.9
28
1790
125
80
75
110 W
2920 1251 02
3.4
10.8
10.3
30
1790
165
80
75
160 W
3.4
9.1
8.6
30
1790
166
80
75
160 W
3.4
7.4
6.9
30
1790
169
80
75
160 W
Instruction book
--
l/s
10
9.5
30
1480
211
125
75
--
bar(e)
bar(e)
C
r/min
kW
l
dB(A)
l/s

Power input 3) . . . . . . . . . . . . . . . . . . . .
Oil capacity . . . . . . . . . . . . . . . . . . . . . . .
rise of 10C . . . . . . . . . . . . . . . . . . . . . . .
--
10
9.5
30
1485
266
125
75
250
3.9
10
9.5
30
1490
203
125
75
200 W
7.5
7
30
1490
267
125
75
--
250
4.9
10
9.5
30
1490
259
125
75
250 W
2.0
13.8
13.3
28
1785
104
75
74
90 W
2920 1251 02

200
Compressor type
Specific data of GA/GA W 200 and -250 10/13 bar - 50 Hz 1)
7.5
7
30
1490
215
125
75
--
Maximum working pressure . . . . . . . . . . . . . . . . . . . . . .

Nominal working pressure . . . . . . . . . . . . . . . . . . . . . . .
Air temperature at outlet valve, approx. . . . . . . . . . . . .
Motor shaft speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power input 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sound pressure level 2) . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling water flow at temperature rise of 10C . . . . . .
bar(e)
bar(e)
C
r/min
kW
l
dB(A)
l/s
200
7.5.11
--
13.8
13.3
30
1790
178
80
78
160
7.5 bar - 50 Hz 1)
--
13.8
13.3
28
1790
128
75
77
110
Compressor type
Specific data of GA/GA W 200 and -250
13.8
13.3
27
1785
108
75
76
bar(e)
bar(e)
C
r/min
kW
l
dB(A)

Power input 3) . . . . . . . . . . . . . . . . . . . .
Oil capacity . . . . . . . . . . . . . . . . . . . . . . .
rise of 10C . . . . . . . . . . . . . . . . . . . . . . .
7.5.10
90
200 psi - 60 Hz 1)
Compressor type
Instruction book
--
13
12.5
30
1490
273
125
75
250
7.5
7
30
1490
207
125
75
3.9
200 W
2.4
13.8
13.3
28
1790
125
75
75
110 W
4.9
13
12.5
30
1490
265
125
75
250 W
7.5
7
30
1490
260
125
75
4.9
250 W
3.4
13.8
13.3
30
1790
171
80
75
160 W
39
--
7.4
6.9
30
1790
223
125
78
--
7.4
6.9
30
1790
267
125
78
250
--
7.4
6.9
30
1790
292
125
78
315
9.1
8.6
30
1790
222
125
78
--
bar(e)
bar(e)
C
r/min
kW
l
dB(A)
l/s
200
--
9.1
8.6
30
1790
265
125
78
250
--
9.1
8.6
30
1790
296
125
78
315
l/s
bar(e)
bar(e)
C
r/min
kW
l
dB(A)
--
10.8
10.3
30
1790
226
125
78
200
--
10.8
10.3
30
1790
263
125
78
250
--
10.8
10.3
30
1790
295
125
78
315
3.9
10.8
10.3
30
1790
213
125
75
200 W
3.9
9.1
8.6
30
1790
209
125
75
200 W
3.9
7.4
6.9
30
1790
210
125
75
200 W
40


Power input 3) . . . . . . . . . . . . . . . . . . .
Oil capacity . . . . . . . . . . . . . . . . . . . . . . .
rise of 10C . . . . . . . . . . . . . . . . . . . . . . .
Compressor type
Specific data of GA/GA W 200 up to -315 150 psi - 60 Hz 1)

Power input 3) . . . . . . . . . . . . . . . . . . .
Oil capacity . . . . . . . . . . . . . . . . . . . . . . .
rise of 10C . . . . . . . . . . . . . . . . . . . . . . .
7.5.14
l/s
bar(e)
bar(e)
C
r/min
kW
l
dB(A)
200
100 psi - 60 Hz 1)
Specific data of GA/GA W 200 up to -315 125 psi - 60 Hz 1)
Compressor type
7.5.13

Power input 3) . . . . . . . . . . . . . . . . . . . .
Oil capacity . . . . . . . . . . . . . . . . . . . . . . .
rise of 10C . . . . . . . . . . . . . . . . . . . . . . .
Compressor type
4.8
10.8
10.3
30
1790
250
125
75
250 W
4.8
9.1
8.6
30
1790
252
125
75
250 W
4.8
7.4
6.9
30
1790
254
125
75
250 W
2920 1251 02
5.3
10.8
10.3
30
1790
282
125
75
315 W
5.3
9.1
8.6
30
1790
283
125
75
315 W
5.3
7.4
6.9
30
1790
279
125
75
315 W
Instruction book
1 l = 0.264 US gal
1 l = 0.220 Imp gal (UK)
1 l = 0.035 cu.ft
1 l/s = 2.117 cfm
2920 1251 02
13.8
13.3
30
1790
259
125
75
7.8
250 W
13.8
13.3
30
1790
279
125
75
5.3
315 W
41
1 mm = 0.039 in
1 mbar = 0.401 in water column
1 N = 0.225 lbf
1 Nm = 0.738 lbf.ft x C = (32 + 1.8 x) F 4)
13.8
13.3
30
1790
292
125
78
--
315

4) A temperature difference of 1C = a temperature difference of 1.8F
1 bar = 14.504 psi

1 g = 0.035 oz
1 kg = 2.205 lb
1 kW = 1.341 hp (UK and US)
7.6 Conversion list of SI units into British/US units
13.8
13.3
30
1790
272
125
78
--
bar(e)
bar(e)
C
r/min
kW
l
dB(A)
l/s
Maximum working pressure . . . . . . . . . . . . . . . . . . . . . .

Nominal working pressure . . . . . . . . . . . . . . . . . . . . . . .
Air temperature at outlet valve, approx. . . . . . . . . . . . .
Motor shaft speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power input 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sound pressure level 2) . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling water flow at temperature rise of 10C . . . . . .
200 psi - 60 Hz 1)
250
Specific data of GA/GA W 250 and -315
Compressor type
7.5.15
Instruction book

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This instruction book meets the requirements for instructions specified by the machinery directive

98/37/EC and is valid for CE as well as non-CE labelled machines

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Registration code: APC G 90/'99 / 38 / 995

No. 2920 1251 02

Copyright 2000, Atlas Copco Airpower n.v., Antwerp, Belgium.

GA90 - GA110 - GA132 - GA160 - GA200 - GA250 - GA315

Atlas Copco Stationary Air Compressors

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The regulator maintains the net pressure between programmable

1.2.1.1 Automatic control of compressor operation

1.2 Elektronikon control system

GA and GA W include mainly:

The compressors are available for a maximum working pressure

GA90 up to GA315 are air-cooled, abbreviated as "GA". GA90

1.1 General description

1) GA/GA W 90 up to -160 are equipped with one compressor

The regulator continuously monitors the oil, oil filters, oil

1.2.1.3 Monitoring components subject to service

The message disappears as soon as the cause of the trouble is

1.2.1.2 Protecting the compressor

The regulator stops the compressor whenever possible to reduce

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Figs. 1. GA90 and GA110 W

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For compressors leaving the factory, this function is made

After a start command (either automatic start by the electronic

1.2.1.5 Permissive start

1.2.1.4 Automatic restart after voltage failure

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One contactor/circuit breaker on GA90 and -110, two

Fig. 2. Electric cabinet (typical example)

Fig. 3a. Control panel

General alarm LED

Indicates messages concerning the

Blinks if a shut-down condition

Is alight if a shut-down warning

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Indicates that the voltage is

Automatic operation Indicates that the regulator is autoLED

Indicators, keys and buttons

1.2.2 Control panel (Fig. 3a)

Fig. 3c. Example of a main menu

Fig. 3b. Example of the main display

Control mode switch Key switch to select the

Push button to stop the compressor

Push button to stop the

Push button to start the

Key to go to the next field of the

Keys to scroll through the display.

Keys to control and program the

To add compressor start/stop commands (day/

To load the compressor manually

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Remote control mode 2. The compressor

Local control mode (remote control mode

Remote control mode 1 (local control is

Compressor control mode