Instruction book

Oil-injected screw compressors

GA 37+, GA 45+
Atlas Copco
Oil-injected screw compressors

GA 37+, GA 45+

Instruction book
Original instructions

COPYRIGHT NOTICE
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.
This instruction book is valid for CE as well as non-CE labelled machines. It meets the
requirements for instructions specified by the applicable European directives as
identified in the Declaration of Conformity.

March 2023
No. 2920 7196 21

www.atlascopco.com
 Instruction book

Table of contents

1 Safety precautions..........................................................................................................6

1.1 Safety icons................................................................................................................................ 6

1.2 General safety precautions.................................................................................................... 6

1.3 Safety precautions during installation................................................................................ 7

1.4 Safety precautions during operation.................................................................................... 8

1.5 Safety precautions during maintenance or repair............................................................ 10

1.6 Dismantling and disposal........................................................................................................ 11

2 General description...................................................................................................... 13

2.1 Introduction............................................................................................................................. 13

2.2 Air and oil circuit.....................................................................................................................16

2.3 Cooling system.........................................................................................................................19

2.4 Condensate system..................................................................................................................19

2.5 Regulating system................................................................................................................... 23

2.6 Electrical system.................................................................................................................... 24

2.7 Air dryer....................................................................................................................................25

3 Elektronikon™ Touch controller................................................................................. 27

3.1 Controller................................................................................................................................27

3.2 Control panel.......................................................................................................................... 29

3.3 Icons used................................................................................................................................. 30

3.4 Main screen............................................................................................................................... 34

3.5 Quick access screen................................................................................................................35

3.6 Menu screen..............................................................................................................................36

2 2920 7196 21
Instruction book

3.7 Data menu.................................................................................................................................. 38

3.8 Service menu............................................................................................................................. 40

3.9 Week timer menu.......................................................................................................................42

3.10 Event history menu..................................................................................................................42

3.11 Machine settings menu............................................................................................................ 43

3.12 Controller settings menu..................................................................................................... 46

3.13 Access level..............................................................................................................................49

4 Energy recovery (optional).......................................................................................... 51

4.1 Energy recovery unit..............................................................................................................51

4.2 Energy recovery systems...................................................................................................... 52

4.3 Operation.................................................................................................................................. 53

4.4 Maintenance.............................................................................................................................. 55

4.5 Energy recovery data.............................................................................................................56

4.6 Cooling water requirements................................................................................................. 58

5 Installation.....................................................................................................................63

5.1 Dimension drawings................................................................................................................. 63

5.2 Installation proposal............................................................................................................. 63

5.3 Electrical connections.......................................................................................................... 67

5.4 Pictographs.............................................................................................................................. 69

6 Operating instructions................................................................................................. 71

6.1 Initial start-up..........................................................................................................................71

6.2 Before starting........................................................................................................................74

6.3 Starting ....................................................................................................................................75

2920 7196 21 3
 Instruction book

6.4 During operation..................................................................................................................... 76

6.5 Checking the display............................................................................................................... 78

6.6 Stopping ....................................................................................................................................80

6.7 Taking out of operation..........................................................................................................81

7 Maintenance.................................................................................................................. 82

7.1 Preventive maintenance schedule.........................................................................................82

7.2 Oil specifications..................................................................................................................... 84

7.3 Drive motor ..............................................................................................................................86

7.4 Air filter....................................................................................................................................86

7.5 Oil and oil filter change.........................................................................................................87

7.6 Coolers..................................................................................................................................... 88

7.7 Safety valves............................................................................................................................90

7.8 Dryer maintenance instructions...........................................................................................90

7.9 Service kits............................................................................................................................... 91

7.10 Storage after installation.................................................................................................... 91

8 Problem solving............................................................................................................93

9 Technical data............................................................................................................... 97

9.1 Readings on display................................................................................................................. 97

9.2 Electric cable size and fuses................................................................................................ 98

9.3 Protection settings.............................................................................................................. 104

9.4 Dryer switches.......................................................................................................................104

9.5 Reference conditions and limitations................................................................................ 104

9.6 Compressor data................................................................................................................... 105

9.7 Technical data controller.................................................................................................. 106

4 2920 7196 21
Instruction book

10 Instructions for use.................................................................................................... 108

11 Guidelines for inspection...........................................................................................109

12 Pressure equipment directives..................................................................................110

13 Declaration of conformity...........................................................................................111

2920 7196 21 5
 Instruction book

1 Safety precautions

1.1 Safety icons

Explanation

Danger to life

Warning

Important note

1.2 General safety precautions

1. The operator must employ safe working practices and observe all related work safety
requirements and regulations.
2. If any of the following statements does not comply with the applicable legislation, the stricter of
the two shall apply.
3. Installation, operation, maintenance and repair work must only be performed by authorized,
trained, specialized personnel. The personnel should apply safe working practices by use of
personal protection equipment, appropriate tools and defined procedures.
4. The compressor is not considered capable of producing air of breathing quality. For air of
breathing quality, the compressed air must be adequately purified according to the applicable
legislation and standards.
5. Before any maintenance, repair work, adjustment or any other non-routine checks:
• Stop the machine
• Press the emergency stop button
• Switch off the voltage
• Depressurize the machine
• Lock Out - Tag Out (LOTO):
• Open the power isolating switch and lock it with a personal lock
• Tag the power isolating switch with the name of the service technician.
• On units powered by a frequency converter, wait 10 minutes before starting any electrical
repair.
• Never rely on indicator lamps or electrical door locks before maintenance work, always
disconnect and check with measuring device.

If the machine is equipped with an automatic restart after voltage failure

function and if this function is active, be aware that the machine will restart
automatically when the power is restored if it was running when the power
was interrupted!

6 2920 7196 21
Instruction book

6. Never play with compressed air. Do not apply the air to your skin or direct an air stream at
people. Never use the air to clean dirt from your clothes. When using the air to clean
equipment, do so with extreme caution and wear eye protection.
7. The owner is responsible for maintaining the unit in safe operating condition. Parts and
accessories shall be replaced if unsuitable for safe operation.
8. It is prohibited to walk or stand on the unit or on its components.
9. If compressed air is used in the food industry and more specifically for direct food contact, it is
recommended, for optimal safety, to use certified Class 0 compressors in combination with
appropriate filtration depending on the application. Please contact your customer center for
advice on specific filtration.

1.3 Safety precautions during installation

All responsibility for any damage or injury resulting from neglecting these
precautions, or non-observance of the normal caution and care required for
installation, operation, maintenance and repair, even if not expressly stated, will
be disclaimed by the manufacturer.

Precautions during installation

1. The machine must only be lifted using suitable equipment in accordance with the applicable
safety regulations. Loose or pivoting parts must be securely fastened before lifting. It is strictly
forbidden to dwell or stay in the risk zone under a lifted load. Lifting acceleration and
deceleration must be kept within safe limits. Wear a safety helmet when working in the area of
overhead or lifting equipment.
2. The unit is designed for indoor use. If the unit is installed outdoors, special precautions must be
taken. Consult your supplier.
3. In case the device is a compressor, place the machine where the ambient air is as cool and
clean as possible. If necessary, install a suction duct. Never obstruct the air inlet. Care must be
taken to minimize the entry of moisture at the inlet air.
4. Any blanking flanges, plugs, caps and desiccant bags must be removed before connecting the
pipes.
5. Air hoses must be of correct size and suitable for the working pressure. Never use frayed,
damaged or worn hoses. Distribution pipes and connections must be of the correct size and
suitable for the working pressure.
6. In case the device is a compressor, the aspirated air must be free of flammable fumes, vapors
and particles, e.g. paint solvents, that can lead to internal fire or explosion.
7. In case the device is a compressor, arrange the air intake so that loose clothing worn by people
cannot be drawn in.
8. Ensure that the discharge pipe from the compressor to the aftercooler or air net is free to
expand under heat and that it is not in contact with or close to flammable materials.
9. No external force may be exerted on the air outlet valve; the connected pipe must be free of
strain.
10. If remote control is installed, the machine must bear a clear sign stating: DANGER: This
machine is remotely controlled and may start without warning.
The operator has to make sure that the machine is stopped and depressurized and that the
electrical isolating switch is open, locked and labelled with a temporary warning before any
maintenance or repair. As a further safeguard, persons switching on or off remotely controlled

2920 7196 21 7
 Instruction book

machines shall take adequate precautions to ensure that there is no one checking or working
on the machine. To this end, a suitable notice shall be affixed to the start equipment.
11. Air-cooled machines must be installed in such a way that an adequate flow of cooling air is
available and that the exhausted air does not recirculate to the compressor air inlet or cooling
air inlet.
12. The electrical connections must correspond to the applicable codes. The machines must be
earthed and protected against short circuits by fuses in all phases. A lockable power isolating
switch must be installed near the compressor.
13. On machines with automatic start/stop system or if the automatic restart function after voltage
failure is activated, a sign stating "This machine may start without warning" must be affixed
near the instrument panel.
14. In multiple compressor systems, manual valves must be installed to isolate each compressor.
Non-return valves (check valves) must not be relied upon for isolating pressure systems.
15. Never remove or tamper with the safety devices, guards or insulation fitted on the machine.
Every pressure vessel or auxiliary installed outside the machine to contain air above
atmospheric pressure must be protected by a pressure relieving device or devices as required.
16. Piping or other parts with a temperature in excess of 70˚C (158˚F) and which may be
accidentally touched by personnel in normal operation must be guarded or insulated. Other
high temperature piping must be clearly marked.
17. For water-cooled machines, the cooling water system installed outside the machine has to be
protected by a safety device with set pressure according to the maximum cooling water inlet
pressure.
18. If the ground is not level or can be subject to variable inclination, consult the manufacturer.
19. If the device is a dryer and no free extinguishing system is present in the air net close to the
dryer, safety valves must be installed in the vessels of the dryer.

Also consult the following safety precautions: Safety precautions during

operation and Safety precautions during maintenance.
These precautions apply to machinery processing or consuming air or inert gas.
Processing of any other gas requires additional safety precautions typical to the
application which are not included herein.
Some precautions are general and cover several machine types and equipment;
hence some statements may not apply to your machine.

1.4 Safety precautions during operation

All responsibility for any damage or injury resulting from neglecting these
precautions, or non observance of the normal caution and care required for
installation, operation, maintenance and repair, even if not expressly stated, will
be disclaimed by the manufacturer.

Precautions during operation

1. Never touch any piping or components of the machine during operation.
2. Use only the correct type and size of hose end fittings and connections. When blowing through
a hose or air line, ensure that the open end is held securely. A free end will whip and may
cause injury. Make sure that a hose is fully depressurized before disconnecting it.

8 2920 7196 21
Instruction book

3. Persons switching on remotely controlled machines shall take adequate precautions to ensure
that there is no one checking or working on the machine. To this end, a suitable notice shall be
affixed to the remote start equipment.
4. Never operate the machine when there is a possibility of taking in flammable or toxic fumes,
vapors or particles.
5. Never operate the machine below or in excess of its limit ratings.
6. Keep all bodywork doors shut during operation. The doors may be opened for short periods
only, e.g. to carry out routine checks. Wear ear protectors when opening a door.
On machines without bodywork, wear ear protection in the vicinity of the machine.
7. People staying in environments or rooms where the sound pressure level reaches or exceeds
80 dB(A) shall wear ear protectors.
8. Periodically check that:
• All guards are in place and securely fastened
• All hoses and/or pipes inside the machine are in good condition, secure and not rubbing
• No leaks occur
• All fasteners are tight
• All electrical leads are secure and in good order
• Safety valves and other pressure relief devices are not obstructed by dirt or paint
• Air outlet valve and air net, i.e. pipes, couplings, manifolds, valves, hoses, etc. are in
good repair, free of wear or abuse
• Air cooling filters of the electrical cabinet are not clogged
9. If warm cooling air from compressors is used in air heating systems, e.g. to warm up a
workroom, take precautions against air pollution and possible contamination of the breathing
air.
10. On water-cooled compressors using open circuit cooling towers, protective measures must be
taken to avoid the growth of harmful bacteria such as Legionella pneumophila bacteria.
11. Do not remove any of, or tamper with, the sound-damping material.
12. Never remove or tamper with the safety devices, guards or insulations fitted on the machine.
Every pressure vessel or auxiliary installed outside the machine to contain air above
atmospheric pressure shall be protected by a pressure relieving device or devices as required.
13. Yearly inspect the air receiver. Minimum wall thickness as specified in the instruction book must
be respected. Local regulations remain applicable if they are more strict.

Also consult following safety precautions: Safety precautions during installation

and Safety precautions during maintenance.
These precautions apply to machinery processing or consuming air or inert gas.
Processing of any other gas requires additional safety precautions typical to the
application which are not included herein.
Some precautions are general and cover several machine types and equipment;
hence some statements may not apply to your machine.

2920 7196 21 9
 Instruction book

1.5 Safety precautions during maintenance or repair

All responsibility for any damage or injury resulting from neglecting these
precautions, or non observance of the normal caution and care required for
installation, operation, maintenance and repair, even if not expressly stated, will
be disclaimed by the manufacturer.

Precautions during maintenance or repair

1. Always use the correct safety equipment (such as safety glasses, gloves, safety shoes, etc.).
2. Use only the correct tools for maintenance and repair work.
3. Use only genuine spare parts for maintenance or repair. The manufacturer will disclaim all
damage or injuries caused by the use of non-genuine spare parts.
4. All maintenance work shall only be undertaken when the machine has cooled down.
5. A warning sign bearing a legend such as "Work in progress; do not start" shall be attached to
the starting equipment.
6. Persons switching on remotely controlled machines shall take adequate precautions to ensure
that there is no one checking or working on the machine. To this end, a suitable notice shall be
affixed to the remote start equipment.
7. Close the compressor air outlet valve and depressurize the compressor before connecting or
disconnecting a pipe.
8. Before removing any pressurized component, effectively isolate the machine from all sources of
pressure and relieve the entire system of pressure.
9. Never use flammable solvents or carbon tetrachloride for cleaning parts. Take safety
precautions against toxic vapors of cleaning liquids.
10. Scrupulously observe cleanliness during maintenance and repair. Keep dirt away by covering
the parts and exposed openings with a clean cloth, paper or tape.
11. Never weld or perform any operation involving heat near the oil system. Oil tanks must be
completely purged, e.g. by steam cleaning, before carrying out such operations. Never weld on,
or in any way modify, pressure vessels.
12. Whenever there is an indication or any suspicion that an internal part of a machine is
overheated, the machine shall be stopped but no inspection covers shall be opened before
sufficient cooling time has elapsed; this to avoid the risk of spontaneous ignition of the oil vapor
when air is admitted.
13. Never use a light source with open flame for inspecting the interior of a machine, pressure
vessel, etc.
14. Make sure that no tools, loose parts or rags are left in or on the machine.
15. All regulating and safety devices shall be maintained with due care to ensure that they function
properly. They may not be put out of action.
16. Before clearing the machine for use after maintenance or overhaul, check that operating
pressures, temperatures and time settings are correct. Check that all control and shut-down
devices are fitted and that they function correctly. If removed, check that the coupling guard of
the compressor drive shaft has been reinstalled.
17. Every time the separator element is renewed, examine the discharge pipe and the inside of the
oil separator vessel for carbon deposits; if excessive, the deposits should be removed.
18. Protect the motor, air filter, electrical and regulating components, etc. to prevent moisture from
entering them, e.g. when steam cleaning.

10 2920 7196 21
Instruction book

19. Make sure that all sound-damping material and vibration dampers, e.g. damping material on the
bodywork and in the air inlet and outlet systems of the compressor, is in good condition. If
damaged, replace it by genuine material from the manufacturer to prevent the sound pressure
level from increasing.
20. Never use caustic solvents which can damage materials of the air net, e.g. polycarbonate
bowls.
21. Only if applicable, the following safety precautions are stressed when handling
refrigerant:
• Never inhale refrigerant vapors. Check that the working area is adequately ventilated; if
required, use breathing protection.
• Always wear special gloves. In case of refrigerant contact with the skin, rinse the skin with
water. If liquid refrigerant contacts the skin through clothing, never tear off or remove the
latter; flush abundantly with fresh water over the clothing until all refrigerant is flushed
away; then seek medical first aid.

Also consult following safety precautions: Safety precautions during installation

and Safety precautions during operation.
These precautions apply to machinery processing or consuming air or inert gas.
Processing of any other gas requires additional safety precautions typical to the
application which are not included herein.
Some precautions are general and cover several machine types and equipment;
hence some statements may not apply to your machine.

1.6 Dismantling and disposal

Dismantling
Once the end of life of the machine is reached, please follow next steps:
1. Stop the machine.
2. Check all safety precautions mentioned in the previous chapters to secure safe handling (for
example, LOTO, cool-down, depressurize and discharge).
3. Separate the harmful from the safe components (for example, drain oil from oil containing
parts).
4. Refer to the disposal topic mentioned below.

Disposal of electrical and electronic appliances (WEEE)

This equipment falls under the provisions of the European Directive 2012/19/EU on waste electrical
and electronic appliances (WEEE) as well as under the UKCA Waste Electrical and Electronic
Equipment regulations 2013 and may not be disposed as unsorted waste.

The equipment is labelled in accordance with the European Directive 2012/19/EU and the UKCA
Waste Electrical and Electronic Equipment regulations 2013 with the crossed-out wheelie bin
symbol.

2920 7196 21 11
 Instruction book

At the end of life-time of the electric and electronic equipment (EEE) it must be taken to separate
collection.
For more information check with your local waste authority, customer center or distributor.

Disposal of other used material

Used filters or any other used material (for example, filter bags, filter media, desiccant, lubricants,
cleaning rags and machine parts) must be disposed of in an environmentally friendly and safe
manner, and in line with the local recommendations and environmental legislation.

12 2920 7196 21
Instruction book

2 General description

2.1 Introduction
GA 37+ and GA 45+ are single-stage, oil-injected screw compressors, driven by an electric motor.
The compressors are air cooled or water cooled.
The compressors are controlled by an Elektronikon™ Touch controller.
The controller is fitted to the right hand door panel on the front side. An electric cabinet comprising
the motor starter is located behind this panel.
The compressors are enclosed in a sound-insulated bodywork.
There are 2 versions of the compressor: Workplace Pack (without integrated dryer) and Workplace
Full-Feature (with integrated dryer).
The dryer removes water from the compressed air by cooling the air to near freezing point.

Figure 1: Front view

2920 7196 21 13
 Instruction book

Figure 2: Motor side view, Pack

Figure 3: Service side view, Pack

14 2920 7196 21
Instruction book

Figure 4: Motor side view, Full-Feature

Figure 5: Service side view, Full-Feature

1 Electric cabinet
AV Outlet valve

2920 7196 21 15
 Instruction book

Ca Air cooler
Co Oil cooler
E Compressor element
ER Elektronikon™ Touch controller
FN Cooling fan
M1 Motor of the compressor
S3 Emergency stop button
UA Unloader
Da (Dm) Condensate outlets
AF Air filter
AR Air receiver (oil separator tank)
OF Oil filter

Table 1: References

2.2 Air and oil circuit

Air circuit

Figure 6: Flow diagram, air circuit (compressors without integrated dryer)

16 2920 7196 21
Instruction book

Figure 7: Flow diagram, air circuit (compressors with integrated dryer)

Reference Description
1 Intake air
2 Air/oil mixture
3 Oil
4 Wet compressed air
5 Condensate
6 Dried compressed air

Description
Air drawn through inlet filter (AF) and open inlet valve (IV) of the unloader is compressed in
compressor element (E). A mixture of compressed air and oil flows into the air receiver/oil separator
tank (AR). The air is discharged through outlet valve (AV) via minimum pressure valve (Vp) and air
cooler (Ca).
The air cooler is provided with a moisture trap (MT).
On compressors with integrated dryer, the air flows through air dryer (DR) before it is discharged
through outlet valve (AV). Also see section Air dryer.

2920 7196 21 17
 Instruction book

Under all circumstances, the minimum pressure valve (Vp) keeps the pressure in the separator tank
(AR) above the minimum value that is required for lubrication of the compressor element. An
integrated check valve prevents the compressed air downstream the minimum pressure valve from
being vented to atmosphere during unloaded operation. When the compressor is stopped, inlet
valve (IV) closes, preventing compressed air (and oil) to be vented into the air filter.

Oil circuit

Figure 8: Flow diagram, oil circuit

Reference Description
1 Intake air
2 Air/oil mixture
3 Oil
4 Wet compressed air

Description
Air pressure in the separator tank forces the oil via oil filter (OF) to compressor element (E), where
it acts as sealant, coolant, lubricant and corrosion inhibitive (during stand still periods).
In air receiver/oil separator tank (AR), most of the oil is separated from the air/oil mixture by gravity
and inertia. The remaining oil is separated by oil separator (OS). The oil collects in the lower part of
air receiver/oil separator (AR).
The oil circuit is provided with a thermostatic bypass valve (BV). When the oil temperature is below
its setpoint, the oil cooler is bypassed. Bypass valve (BV) starts opening the supply to cooler (Co)
when the oil temperature has increased to the setpoint temperature. At approx. 15 ˚C (27 ˚F) above
the setpoint temperature, all the oil flows through the oil cooler.
A tropical thermostatic valve (available as an option) offers a higher opening temperature, it helps
avoiding condensate accumulation in the oil. This option is advised when the compressor operates
in high humidity conditions.

18 2920 7196 21
Instruction book

2.3 Cooling system

Diagram

Reference Description
1 Intake air
2 Air/oil mixture
3 Oil
4 Wet compressed air
5 Condensate

Description
The cooling system on air-cooled compressors comprises air cooler (Ca) and oil cooler (Co).
The cooling air flow is generated by fan (FN).

2.4 Condensate system

The condensate, collected in the moisture trap of the air cooler, is evacuated via an automatic
drain. A compressor with integrated dryer has an additional drain on the moisture trap of the dryer.
Each drain is connected to its outlet connection (Da) and a manual drain valve (Dm).

Electronic drains
The GA 37+ and GA 45+ Pack have an electronic water drain (LD drain). On Full-Feature
compressors, an additional electronic water drain is provided.
The condensate accumulates in the collector of the drain. When the condensate reaches a certain
level, it is discharged through the automatic drain outlet (Da).
The Test button on top of the drain can be used in three different ways, according the situation:

2920 7196 21 19
 Instruction book

• When pressed during normal operation, it starts the manual drain test.
• When pressed during an alarm, it resets the control logic
• By pressing the Test button for at least 5 seconds, the self diagnosis routine will start.

Figure 9: Electronic condensate drains

Green LED on
Normal operation, drain is in standby and awaiting condensate.
Green LED blinking
Normal operation, drain valve is open to drain water.
Green LED fading on/off
Water is not flowing in to the drain‘s tank. If the floater does not reach the upper level
for 3 hours, the solenoid is energized for 2 seconds. This cycle is repeated for 5 times
(so up to 15 hours). Afterwards, the green light starts fading on/off.
Causes:
• No condensate entering the tank.
• Float mounted incorrectly (upside down).
Checks:
• Is any condensate reaching the drain? Does the water separation take place in
the heat exchanger?
• Is the floater mounted in its correct position, for instance after maintenance?
Solution:
• Although this LED sign does not indicate any kind of failure, the drain can be
reset by pushing the test button (T) for 5 seconds.

20 2920 7196 21
Instruction book

Red LED blinking slowly: cleaning routine 1

The drain’s tank is filled and the water cannot be drained or can only be drained very
slowly.
In normal operation, the drain gets 20 seconds time to drain all water. If the drain is
not emptied within this time frame, a (first) cleaning routine is activated, alternatively
opening and closing the valve for 2 seconds, during maximum 30 cycles. This routine
is started in an attempt to unblock the drain.
If this first unlock routine is unsuccessful, a second routine will be started.
Causes:
• Filter mesh clogged.
• Not enough pressure on drain.
• Internal problem with the drain.
Checks:
• Is the filter clean and in good condition?
• Is there a minimum pressure of 0.2 bar (2.8 psi) in the drain?
Press the test button (T) for at least 5 seconds to reset the drain.
Red LED blinking fast
If cleaning routine 1 is completed (after 30 cycles) but still unsuccessful, cleaning
routine 2 is activated. This routine will open (3 sec) and close (60 sec) the drain’s
valve until a floater is in lower position, so the water is completely drained.
Meanwhile, the external alarm signal is activated.
Causes:
• Filter mesh clogged.
• Not enough pressure on drain.
• Internal problem with the drain.
Checks:
• Is the filter clean and in good condition?
• Is there a minimum pressure of 0.2 bar (2.8 psi) in the drain?
From this point onwards, the drain will remain in this routine, even after restart. Press
the test button (T) for at least 5 seconds to reset the drain.
Red LED on
An irreversible error occurred. Replace the drain and keep the failed one for further
analysis.

Table 2: LED explanation

2920 7196 21 21
 Instruction book

Drain connections

Figure 10: Condensate drain connections

Reference Designation
Da Automatic drain connection
Da1 Automatic drain connection of the dryer (only on units with integrated dryer)

22 2920 7196 21
Instruction book

2.5 Regulating system

Load/unload regulating system

Figure 11: Regulating system (loaded condition)

Loading
When the net pressure is below the loading pressure, solenoid valve (Y1) is energised. Results:
• The space above unloading valve/blow-off valve (UV) is connected with the oil separator tank
pressure (1) via the solenoid valve.
• Unloading valve/blow-off valve (UV) moves downwards, closing off the connection to channels
(2) and (3).
• Underpressure from the compressor element causes loading plunger (LP) to move downwards
and inlet valve (IV) to open fully.
Air delivery is 100%, the compressor runs loaded.

Unloading
If the air consumption is less than the air output of the compressor, the net pressure increases.
When the net pressure reaches the unloading pressure, solenoid valve (Y1) is de-energised.
Results:
• The pressure above unloading valve/blow-off valve (UV) is released to atmosphere and the
space above valve (UV) is no longer in connection with the oil separator tank pressure (1).
• Unloading valve/blow-off valve (UV) moves upwards, connecting the oil separator tank pressure
(1) with channels (2) and (3).
• The pressure in channel (2) causes the loading plunger (LP) to move upwards, causing inlet
valve (IV) to close, while the pressure is gradually released to atmosphere.
• The pressure in the separator tank stabilises at low value. A small amount of air is kept drawn
in to guarantee a minimal pressure, required for lubrication during unloaded operation.
Air output is stopped, the compressor runs unloaded.

2920 7196 21 23
 Instruction book

2.6 Electrical system

Electrical components
The electrical system is comprised of the following components:

Figure 12: Typical example of electric cubicle

Reference Designation
F1 Fuse
F2 Fuse
F3 Fuse
F7/8/9 Fuses (only on units with integrated dryer)
F21 Overload relay, compressor motor
Q15 Circuit breaker, fan motor (on air-cooled compressors)
K5 Auxiliary relay
K11 Auxiliary contactor (only on units with integrated dryer)
K12 Auxiliary contactor (only on units with integrated dryer)
K25 Phase sequence relay
E10 Smartbox
K21 Line contactor
K22 Star contactor
K23 Delta contactor

24 2920 7196 21
Instruction book

Reference Designation
T1 Transformer
PE Earth terminal
1X0 Customer supply connection

Electrical diagram

9820 3003 16 Service diagram

The complete electrical diagram can be found in the electric cubicle and in the technical
documentation, supplied with the machine.

2.7 Air dryer

(On compressors with integrated dryer only)

Flow diagram

Figure 13: Air dryer

Reference Name
AI Air inlet
AO Air outlet
1 Air/air heat exchanger
2 Air/refrigerant heat exchanger/evaporator
3 Condensate separator
4 Automatic drain / condensate outlet
5 Refrigerant compressor
6 Refrigerant condenser
7 Liquid refrigerant dryer/filter

2920 7196 21 25
 Instruction book

Reference Name
8 Capillary
9 Bypass valve
10 Condenser cooling fan
11 Pressure switch, fan control
12 Liquid separator

Compressed air circuit

Compressed air enters heat exchanger (1) and is cooled by the outgoing, cold, dried air. Water in
the incoming air starts to condense. The air then flows through heat exchanger/evaporator (2),
where the refrigerant evaporates, causing the air to be cooled further to close to the evaporating
temperature of the refrigerant. More water in the air condenses. The cold air then flows through
separator (3) where all the condensate is separated from the air. The condensate is automatically
drained through condensate drain (4).
The cold, dried air flows through heat exchanger (1) where it is warmed up by the incoming air.

Refrigerant circuit
Compressor (5) delivers hot, high-pressure refrigerant gas which flows through condenser (6)
where most of the refrigerant condenses.
The liquid refrigerant flows through liquid refrigerant dryer/filter (7) to capillary tube (8). The
refrigerant leaves the capillary tube at about evaporating pressure.
The refrigerant enters evaporator (2) where it withdraws heat from the compressed air by further
evaporation at about constant pressure. The heated refrigerant leaves the evaporator and is sucked
in by the compressor (5) through a liquid separator (12).
Bypass valve (9) regulates the refrigerant flow. Fan (10) is switched on or off by switch (11)
depending on the pressure degree of the condensate.

26 2920 7196 21
Instruction book

3 Elektronikon™ Touch controller

3.1 Controller

Figure 14: The Elektronikon™ Touch controller

Introduction
The controller has the following functions:
• Controlling the unit
• Protecting the unit
• Monitoring components subject to service
• Automatic Restart After Voltage Failure (ARAVF)

Automatic control of the unit

The controller maintains the net pressure between programmable limits by automatically loading
and unloading the unit (fixed speed units) or by adapting the motor speed (units with frequency
converter).
A number of programmable settings, e.g. the unloading and loading pressures (for fixed speed
units), the setpoint (for units with frequency converter), the minimum stop time, the maximum
number of motor starts and several other parameters are taken into account.
The controller stops the unit whenever possible to reduce the power consumption and restarts it
automatically when the net pressure decreases. If the expected unloading period is too short, the
unit is kept running to prevent too short standstill periods.

2920 7196 21 27
 Instruction book

It is possible to program a number of time-based commands for automatic start/

stop. Take into account that a start command will be executed (if programmed
and activated), even after manually stopping the unit.

Protecting the unit

Shutdown
Several sensors are provided on the unit. If one of the measured signals exceeds the programmed
shutdown level, the unit will be stopped.
Example: If the element outlet temperature exceeds the programmed shutdown level, the unit will
be stopped. This will be indicated on the display of the controller.
The unit will also be stopped in case of overload of the drive motor or fan motor.

Before remedying, consult the Safety precautions.

Before resetting a warning or shutdown message, always solve the problem.
Frequently resetting these messages without remedying may damage the unit.

Shutdown warning
A shutdown warning level is a programmable level below the shutdown level.
If one of the measurements exceeds the programmed shutdown warning level, a message will
appear on the display and the general alarm LED will light up to warn the operator before the
shutdown level is reached.
The message disappears as soon as the warning condition disappears.
A warning will also appear if the dew point temperature is too high (on units with integrated dryer).
When the shutdown warning is shown, press stop button to stop the unit and wait until the unit has
stopped. Switch off the voltage, inspect the unit and remedy if necessary. The warning message will
disappear as soon as the warning condition disappears.

Service warning
A number of service operations are grouped as a Service Plan. Each Service Plan has a
programmed time interval. If the service timer exceeds a programmed value, this will be indicated
on the display to warn the operator to carry out the service actions belonging to that Service Plan.
When the service warning is shown, stop the unit, switch off the voltage and contact your supplier
to schedule the necessary maintenance actions. See section Preventive maintenance schedule.

Automatic Restart After Voltage Failure (ARAVF)

The controller has a built-in function to automatically restart the unit when the voltage is restored
after voltage failure.
For units leaving the factory, this function is made inactive. If desired, the function can be activated.
Consult your supplier.

28 2920 7196 21
Instruction book

If the function is activated and provided the regulator was in the automatic
operation mode, the unit will automatically restart if the supply voltage to the
module is restored.
The ARAVF label shall be glued next to the controller.

3.2 Control panel

Figure 15: Control panel

Parts and functions

Reference Designation Function

Shows the unit operating condition and several
1 Touch screen icons to navigate through the menu.
The screen can be operated by touch.
Flashes in case of a shut-down and is lit in case
2 Warning sign
of a warning condition.
3 Service sign Lit when service is needed.
Lit when the unit is running in automatic
4 Operation sign
operation.
5 Voltage sign Indicates that power is switched on.
6 Stop button Stops the unit.
Starts the unit. The operation sign (4) lights up.
7 Start button
The controller is operative.

2920 7196 21 29
 Instruction book

3.3 Icons used

Menu icons

Menu Icon Menu Icon Menu Icon

Status

Inputs

Data Outputs

Counters

Aux.
Equipment Converters
Parameters

Overview

Service Service Plan

Service
Service
History
Service
functions

Clean Screen

Week
Week Timer
Remaining
Running Time

Event History Saved Data

30 2920 7196 21
Instruction book

Menu Icon Menu Icon Menu Icon

Alarms

Regulation

Control
Parameters
Machine
Converter(s)
Settings
Aux.
Equipment Fan
Parameters
Internal
SmartBox

Auto Restart

Ethernet
Network Settings
Settings
CAN Settings

Language

Localisation Date/Time
Controller
Settings
Units

User
Password

Help

Information

Status icons

Icon Description

Motor Stopped

Motor Stopped Wait

2920 7196 21 31
 Instruction book

Running Unloaded

Manual Unload

Running Unloaded Wait

Running Loaded

Failed to Load

Running Loaded Wait

Manual Stop

Machine Control Mode, Local

Machine Control Mode, Remote

Machine Control Mode, LAN

Automatic Restart After Voltage Failure

Week Timer Active

System icons

Icon Description

Basic User

Advanced User

Service User

Antenna 25%

Antenna 50%

Antenna 75%

32 2920 7196 21
Instruction book

Antenna 100%

Change between screens (indication)

Energy recovery

Dryer

Element

Drain(s)

Analogue Output

Menu

Reset

Auto Restart

Filter(s)

Cooler

Valve(s)

Power Meter

Input icons

Icon Description

Pressure

Temperature

Special Protection

Open

2920 7196 21 33
 Instruction book

Closed

This chapter gives a general survey of available icons. Not all icons mentioned
in this chapter are applicable to every machine.

3.4 Main screen

Function
The Main screen is the screen that is shown automatically when the voltage is switched on. It is
switched off automatically after a few minutes when there is no touch input.

Description

Reference Designation Function

The home button is always shown and
1 Home button can be tapped to return to the main
screen.
On the main screen, the screen
information bar shows the serial
2 Screen information number of the machine. When scrolling
through menus, the name of the current
menu is shown.
The access level button is always
3 Access level button shown and can be tapped to change
the current user access level.
The alarm button can be tapped to
show the current alarms. If an alarm
4 Alarm button
occurs, the icon on the button will be
red.
The service button can be tapped to
5 Service button
show the service information.

34 2920 7196 21
Instruction book

Reference Designation Function

This icon shows the current status of
6 Status
the unit.
Indicates which page you currently see.
The middle indication is the main
screen, left is the menu screen and at
7 Page indicator
the right the quick access screen.
Swipe left or right to go to another
screen.
Tap the field to view the type of
measurement. This will be shown in the
screen information bar.
Examples of inputs:
• Ambient temp
These fields can contain a history chart, an
8, 9, 10, 11 input or a counter value, depending on the • Outlet
type of the machine. • Dryer dewpoint
Examples of counters:
• Running hours
• Load relay
• Loaded hours
The menu button is always shown and
12 Menu button
can be tapped to go to the menu.

3.5 Quick access screen

Function
The screen is used to directly access some frequently used functions.

Procedure
The Quick access screen can be viewed by swiping left, starting from the main screen.

Description

Through this screen, several important settings can be viewed and modified.

Function Description
Setpoints Several setpoints can be modified by tapping this icon.

2920 7196 21 35
 Instruction book

Function Description
The control mode can be changed by tapping this icon.
• Local control via start/stop buttons
• Remote control via digital input(s)
Control mode
• LAN control via the network.
When in Remote or LAN control, the start/stop buttons on the controller will
not work.
Display language The display language of the controller can be changed by tapping this icon.
Manual unload
When tapped, the machine will go in Manual unload mode until the icon is
(only on fixed
tapped again.
speed units)
Week timer Week timers can be set by tapping this icon.
Remaining running
The Remaining running time can be set and modified by tapping this icon.
time
The reception quality of the internal antenna can be monitored.

Internal SmartBox
Each bar represents 25% reception strength. If the four bars are filled, the
reception strength is 100%. If only one bar is filled, the reception strength is
just 25%.
Auto restart Auto restart can be activated by tapping this icon.

3.6 Menu screen

Function
This screen is used to display the different menus where settings can be viewed or changed.

Procedure
The Menu screen can be viewed by tapping the Menu button or by swiping right, starting from the
main screen.

Description

36 2920 7196 21
Instruction book

Reference Designation Function

The data menu contains the status of the unit, information
(1) Data about the Inputs, Outputs and Counters. The Auxiliary
equipment can also be viewed through this menu.
The service menu contains the Service information. The ‘Clean
(2) Service
screen’ function can be used to clean the touchscreen.
Multiple Week timers and a Remaining running time can be set
(3) Week timer
through this menu.
In case of an alarm, the Status information of the unit is saved
(4) Event history
and can be viewed through this menu.
Alarms settings, Regulation settings and Control parameters
can be changed through this menu. Auxiliary equipment
(5) Machine settings parameters can also be changed.
The Auto restart function can be set through this menu. This
function is password protected.
Network settings, Localisation settings and a User password
(6) Controller settings can be set through this menu. There is also a Help page
available and the Controller information can be shown.

Menu structure
Operating the controller can be done by swiping through screens and tapping icons or menu items.

2920 7196 21 37
 Instruction book

This is the main menu structure. The structure can be different depending on the configuration of
the unit.

3.7 Data menu

Function
This screen is used to display the following submenus:
• Status
• Inputs
• Outputs
• Counters
• Aux. Equipment
These submenus can be entered by tapping the icons.

Procedure
To enter the Data menu screen:
1. Tap the Menu button
2. Tap the Data icon

Description

Reference Designation
(1) Status menu
(2) Inputs menu
(3) Outputs menu
(4) Counters menu
(5) Auxiliary equipment menu

Status menu
Tap the Status icon to enter the Status menu.

38 2920 7196 21
Instruction book

This menu shows the current status of the unit.

If an alarm is active, it can be viewed by tapping the alarm message. To reset an alarm, tap the
reset button (1).

Before remedying, consult the Safety precautions.

Before resetting a warning or shutdown message, always solve the problem.
Frequently resetting these messages without remedying may damage the unit.

Inputs menu
Tap the Inputs icon to enter the Inputs menu.

This menu shows information about all the inputs.

Outputs menu
Tap the Outputs icon to enter the Outputs menu.

This menu shows information about all the outputs.

Voltage-free outputs may only be used to control or monitor functional

systems. They should NOT be used to control, switch or interrupt safety
related circuits.
Check the maximum allowed load on the label.

2920 7196 21 39
 Instruction book

Stop the unit and switch off the supply before connecting external equipment.
Check the Safety precautions.

Counters menu
Tap the Counters icon to enter the Counters menu.

This menu shows an overview of all actual hours and counters of the unit and controller.

Auxiliary equipment menu

Tap the Aux. Equipment icon to enter the Aux. equipment menu.

This menu shows an overview of all auxiliary equipment fitted.

3.8 Service menu

Function
This screen is used to display the following submenus:
• Service
• Service functions (Only visible as advanced user)
• Clean screen
These submenus can be entered by tapping the icons.

Procedure
To enter the Service menu screen:
1. Tap the Menu button
2. Tap the Service icon

40 2920 7196 21
Instruction book

Description

Reference Designation
(1) Service
(2) Service functions (Only visible as advanced user)
(3) Clean screen

Service menu
Tap the Service icon to enter the Service menu.

This menu shows the remaining Running Hours and the remaining Real Time Hours until the next
service. The first row (A) shows the Running Hours when the first service is needed (green), the
second row shows the Real Time Hours (blue)
A service overview can be viewed by tapping icon (1).
The service history can be viewed by tapping icon (3).
When a service plan interval is reached, a message will appear on the screen.

Clean screen
Tap the Clean Screen icon to start the 15 seconds countdown to perform cleaning of the
touchscreen.

The touchscreen and the start and stop button become inactive for 15 seconds.

2920 7196 21 41
 Instruction book

3.9 Week timer menu

Function
This screen is used to set up to 4 different week timers with each up to 8 settings per day.
The week timers can be activated through this screen.
A Remaining Running Time can be set from 5 up to 240 minutes.

Procedure
To enter the Week Timer menu screen:
1. Tap the Menu button
2. Tap the Week Timer icon

Description

Reference Designation Function

If less than 4 weeks are programmed, tap the ‘+’ button to add
(1) Add or select week
a week.
(2) Remove week Tap to remove a programmed week timer.
A selection screen pops up. The user can choose the correct
(3) Activate week timer week by tapping ‘–’ or ‘+’ and can confirm by tapping ‘V’ or
decline by tapping ‘X’.
A selection screen pops up. The user can change the
Remaining running
(4) remaining time by tapping ‘–’ or ‘+’ and can confirm by tapping
time
‘V’ or decline by tapping ‘X’.
A selection screen pops up. The user can change the setting
(5) Add setting by swiping up or down and confirm by tapping ‘V’ or decline by
tapping ‘X’.

3.10 Event history menu

Function
This screen is used to display the saved data in case of an alarm.
These submenus can be entered by tapping the icons.

Procedure
To enter the Event history menu screen:

42 2920 7196 21
Instruction book

1. Tap the Menu button

2. Tap the Event History icon

Description

Reference Designation
(1) Saved Data

Saved data
Tap the Saved Data icon to enter the Saved Data menu.

Scroll through the items swiping up and down in this list. The event date and time is shown at the
right side of the screen.
Press on one of the items in the list for more information reflecting the status of the unit when the
shutdown occurred.

3.11 Machine settings menu

Function
This screen is used to display the following submenus:
• Alarms
• Regulation
• Control Parameters
Only visible if the machine has adaptable parameters.
• Aux. Equipment parameters
• Auto Restart
These submenus can be entered by tapping the icons.

2920 7196 21 43
 Instruction book

Procedure
To enter the Machine settings menu screen:
1. Tap the Menu button
2. Tap the Machine Settings icon

Description

Reference Designation
(1) Alarms menu
(2) Regulation menu
(3) Control Parameters menu
(4) Aux. Equipment Parameters menu
(5) Auto Restart menu

Alarms menu
Tap the Alarms icon to enter the Alarms menu.

A list of all alarms is shown.

When pressing on one of the items in this list, the warning and/or shutdown levels are shown for
this alarm.

Regulation menu
Tap the Regulation icon to enter the Regulation menu.

44 2920 7196 21
Instruction book

Setpoints or pressure bands can be modified through this menu.

Modify a setting
When tapping a list item, a selection screen pops up. The user can modify the setting by tapping ‘–’
or ‘+’ and can confirm by tapping ‘V’ or decline by tapping ‘X’.
Change a selection
When tapping a list item, a selection screen pops up. The user can change the selection by swiping
up or down and confirm by tapping ‘V’ or decline by tapping ‘X’.

Control parameters menu

Tap the Control Parameters icon to enter the Control Parameters menu.

This menu shows information about the Control Parameters.

Modify a setting
When tapping a list item, a selection screen pops up. The user can modify the setting by tapping ‘–’
or ‘+’ and can confirm by tapping ‘V’ or decline by tapping ‘X’.

Auxiliary equipment parameters menu

Tap the Aux. Equipment Parameters icon to enter the auxiliary equipment parameters menu.

This menu shows an overview of all the auxiliary equipment fitted.

Through this menu, the parameters of the auxiliary equipment can be changed.

2920 7196 21 45
 Instruction book

Modify a setting
When tapping a list item, a selection screen pops up. The user can modify the setting by tapping ‘–’
or ‘+’ and can confirm by tapping ‘V’ or decline by tapping ‘X’.

Auto restart menu

If the function is activated and provided the regulator was in the automatic
operation mode, the unit will automatically restart if the supply voltage to the
module is restored.
The ARAVF label shall be glued next to the controller.

Tap the Auto restart icon to enter the Auto Restart menu.
The controller has a built-in function to automatically restart the unit when the voltage is restored
after voltage failure. For units leaving the factory, this function is made inactive. If desired, the
function can be activated. Consult your supplier.

Through this menu, the automatic restart can be activated. The activation is password protected.
The automatic restart settings can also be changed.
Enter a password
When tapping a password protected item, a selection screen pops up. The user can enter the
password by swiping up or down to select the desired number. Once the 4 digits are entered, the
user can confirm by tapping ‘V’ or decline by tapping ‘X’.
Modify a setting
When clicking a list item, a selection screen pops up. The user can modify the setting by tapping ‘–’
or ‘+’ and can confirm by tapping ‘V’ or decline by tapping ‘X’.

3.12 Controller settings menu

Function
This screen is used to display the following submenus:
• Network Settings
• Localisation
• User Password
• Help
• Information
These submenus can be entered by tapping the icons.

46 2920 7196 21
Instruction book

Procedure
To enter the Controller Settings menu screen:
1. Tap the Menu button
2. Tap the Controller Settings icon

Description

Reference Designation
(1) Network Settings menu
(2) Localisation menu
(3) User Password menu
(4) Help menu
(5) Information menu

Network settings menu

Tap the Network Settings icon to enter the Network Settings menu.

Ethernet Settings
The list of Ethernet Settings is shown. When ethernet is turned off, the settings can be modified.
CAN Settings
The list of CAN Settings is shown. When CAN is turned off, the settings can be modified.
Modify a setting
When tapping a list item, a selection screen pops up. The user can modify the setting by tapping ‘–’
or ‘+’ and can confirm by tapping ‘V’ or decline by tapping ‘X’.
Change a selection
When tapping a list item, a selection screen pops up. The user can change the selection by swiping
up or down and confirm by tapping ‘V’ or decline by tapping ‘X’.

2920 7196 21 47
 Instruction book

Localisation menu
Tap the Localisation icon to enter the Localisation menu.

Language
The language setting of the controller can be modified through this menu.
Date/Time
The date and time settings of the controller can be modified through this menu.
Units
The units displayed can be modified through this menu.
Modify a setting
When tapping a list item, a selection screen pops up. The user can modify the setting by tapping ‘–’
or ‘+’ and can confirm by tapping ‘V’ or decline by tapping ‘X’.
Change a selection
When tapping a list item, a selection screen pops up. The user can change the selection by swiping
up or down and confirm by tapping ‘V’ or decline by tapping ‘X’.

User password menu

Tap the User Password icon to enter the User Password menu.

The user password can be activated or deactivated through this menu. Enter and confirm a user
password to activate, repeat to deactivate.
Enter a password
When tapping a password protected item, a selection screen pops up. The user can enter the
password by swiping up or down to select the desired number. Once the 4 digits are entered, the
user can confirm by tapping ‘V’ or decline by tapping ‘X’.

Help menu
Tap the Help icon to enter the Help menu.

48 2920 7196 21
Instruction book

This menu can show a link to the web page of your supplier, a helpdesk phone number or other
helpful information.

Information menu
Tap the Information icon to enter the Information menu.

This menu shows information about the controller.

3.13 Access level

Function
Through this pop-up screen the access level settings can be viewed or changed.

Procedure
The Access Level screen can be viewed or changed by tapping the Access Level button at the
upper right corner of the screen.

Description

Reference Designation Function

(1) User A basic set of parameters is visualized, no password required.
(2) Service This access level is only to be used by certified technicians.

2920 7196 21 49
 Instruction book

Reference Designation Function

(3) Full This access level is only to be used by certified technicians.
(4) Decline Tap to decline the selected user level.
(5) Confirm Tap to confirm the selected user level.

50 2920 7196 21
Instruction book

4 Energy recovery (optional)

4.1 Energy recovery unit

Description
A large part of the energy required for any compression process is transformed into heat. For oil-
injected screw compressors, the major part of the compression heat is dissipated through the oil
system. The energy recovery (ER) systems are designed to recover most of this heat by
transforming it into warm or hot water without any adverse influence on the compressor
performance. The water can be used for diverse applications.

Components
The energy recovery system is completely integrated and mainly comprises:
• Stainless steel oil/water heat exchanger
• Thermostatic by-pass valve for energy recovery heat exchanger(s) (BV2)
• Two temperature sensors for water inlet and outlet control (3 and 4)
• The necessary bolts, flexibles, etc.
• Oil drain plug.

Energy recovery unit (ER-unit)

Figure 16: Main components of the ER unit

2920 7196 21 51
 Instruction book

Reference Designation
1 Water inlet pipe
2 Water outlet pipe
3 Temperature sensor, water inlet pipe
4 Temperature sensor, water outlet pipe
5 Oil drain plug
6 Oil flexible from compressor oil separator vessel to ER unit
7 Oil flexible from ER unit to oil filter housing
PRV Pressure relief valve
BV2 Location of heat exchanger by-pass valve (BV2)
HE Heat exchanger
V1 Selector valve
AR Oil separator tank
OF Oil filter housing
BV1 Location of oil cooler bypass valve (BV1)

Field installation
The main components are assembled ex-factory as a compact unit which fits inside the bodywork
of the compressor. Consult your dealer for installing and connecting the energy recovery unit.

4.2 Energy recovery systems

General
The energy recovery systems can be applied as low temperature rise/high water flow systems or as
high temperature rise/low water flow systems.

Low temperature rise/high water flow systems

For this type of application, the temperature difference between the water in the energy recovery
system and the compressor oil is low. As a consequence, a high water flow is needed for maximum
energy recovery.
Example: The heated water is used to keep another medium at a moderately high temperature, in a
closed circuit, e.g. central heating.

High temperature rise/low water flow systems

For this type of application, a high water temperature rise in the energy recovery system is
obtained, which consequently brings on a low flow rate.
Example: An open circuit where cold water from a main supply is heated by the energy recovery
system for use in a factory, e.g. pre-heating of boiler feed water.

Recovery water flow

For the references, see section Energy recovery data.
The recovery water enters the unit at inlet connection (1). The compression heat is transferred from
the compressor oil to the water in the heat exchanger (HE). The water leaves heat exchanger (HE)
via outlet connection (2).

52 2920 7196 21
Instruction book

Water requirements for closed water circuits

The use of a closed water circuit minimizes supplementary water requirements. Therefore, the use
of soft or even demineralized water is economically feasible and eliminates the problem of scale
deposits. Although the heat exchanger is made of stainless steel, the water circuit connected to the
compressor may require corrosion inhibitors.
Consult section Cooling water requirements to minimize problems due to bad water quality. If in
doubt, consult Atlas Copco.
Add an anti-freeze product such as ethylene-glycol to the water in proportion to the expected
temperature to avoid freezing.

Water requirements for open water circuits

In open, non-recirculating water circuits, major problems that are usually encountered are related to
deposit control, corrosion control, and microbiological growth control. To minimize these problems,
the water that is being used should meet a number of requirements.
See section Cooling water requirements. If in doubt, consult Atlas Copco.

4.3 Operation
Description
The compressor oil flow is controlled by two thermostatic valves (BV1 and BV2), ensuring reliable
compressor operation and optimal energy recovery.
Bypass valve (BV1) is integrated in the oil filter housing of the compressor and controls the oil flow
through the main oil cooler (Co) of the compressor. Bypass valve (BV2) controls the oil flow through
the oil/water heat exchanger (HE) of the ER unit. Both valves consist of an insert (thermostat)
mounted in a housing.

2920 7196 21 53
 Instruction book

Figure 17: Flow diagram of compressor with energy recovery system

Reference Designation Reference Designation

Thermostatic bypass valve of
BV2 OF Oil filter
ER unit
Oil/water heat exchanger (ER
HE AR Oil separator tank
unit)
Thermostatic bypass valve in
E Compressor element BV1
oil filter housing
Co Oil cooler (compressor) Ca Aftercooler (compressor)
1 Water inlet 2 Water outlet

BV2 starts closing the bypass line over the heat exchanger (HE) at the lower limit of its temperature
range. At the upper limit of its temperature range, the bypass line is completely closed and all the
oil flows through the ER heat exchanger.
On compressors versions with a maximum pressure lower than 13 bar (175 psi), BV2 starts
opening at 40 ˚C (104 ˚F) and is completely open at 55 ˚C (131 ˚F).
On compressors with a maximal pressure of 13 bar (175 psi), BV2 starts opening at 60 ˚C (140 ˚F)
and is completely open at 75 ˚C (167 ˚F).
The oil cooler bypass valve (BV1) starts closing the bypass over the oil cooler (Co) at the lower limit
of its temperature range. At the upper limit of its temperature range, the bypass is completely
closed and all the oil flows through the oil cooler (Co).
BV1 must have a higher opening temperature (set point) than BV2 in order to prevent the heat from
being dissipated in the compressor oil cooler (Co) rather than in the oil/water heat exchanger (HE)
when using the compression heat as source for energy recovery. Thermostat BV1 starts to open at
75 ˚C (167 ˚F) and is completely open at 90 ˚C (194 ˚F).

54 2920 7196 21
Instruction book

Energy recovery system in use (see drawing)

Compressor start-up
When the compressor is started up from cold, the oil temperature will be low. Bypass valve (BV2)
shuts off the oil supply through the heat exchanger (HE) and bypass valve (BV1) shuts off the oil
supply through the oil cooler (Co) to prevent the compressor oil from being cooled. The oil flows
from the oil separator tank (AR) through the oil filter(s) (OF) back to compressor element (E).
All energy input is used to rapidly warm up the compressor oil. No energy is recovered.
Maximum energy recovery
As soon as the oil temperature reaches the setpoint (opening temperature) of bypass valve (BV2),
the valve starts closing off the bypass over the heat exchanger (HE) oil flexible, gradually allowing
the oil to flow through the heat exchanger (HE). As the oil temperature rises to approx. 15 ˚C (27
˚F) above the setpoint, all the oil passes through the heat exchanger. The exchange of heat
between the compressor oil and the heat recovery water is maximum. The oil from the heat
exchanger outlet flows via oil filter (OF), compressor element (E) and separator (AR) back to the
inlet of heat exchanger (HE). Bypass valve (BV1) bypasses the oil cooler (Co) as long as the oil
temperature remains below its setpoint.
Operation principle at different loads:
• Low consumption of recovered energy
The temperature of the oil leaving heat exchanger (HE) rises. When the temperature rises
above its set point, oil cooler bypass valve (BV1) will gradually allow the oil to be cooled in the
oil cooler (Co).
• Recovery water flow too high/temperature too low
In this case, bypass valve (BV2) will open the bypass line allowing oil from heat exchanger (HE)
to be mixed with oil from separator (AR). Energy is transferred from the compressor oil to the
water, but at a relatively low temperature level.

Energy recovery system not in use

The oil circuit is the same as without installation of the energy recovery system.
No energy is recovered.
This situation should be considered as exceptional, e.g. in case of maintenance of the energy
recovery system or when no energy is required for a long period.
Run the unit unloaded for a few minutes before isolating the energy recovery system from the
compressor.

Stopping the unit for a long period

In case of an open water system and/or if freezing temperatures can be expected, isolate the
compressor water system and blow it through with compressed air.

4.4 Maintenance
Compressor oil
For references used, consult section Energy recovery.
Oil change:

2920 7196 21 55
 Instruction book

1. Run the unit until warm. Stop the unit, switch off the isolating switch and close the air outlet
valve of the compressor.
2. Depressurize the compressor and drain the oil by opening the drain valve on the oil separator
vessel. See section Oil and oil filter change.
3. Resume oil change as described in section Oil and Filter Change in this book.
Units with the energy recovery option are factory filled with 8000 h oil.
The oil should be changed every 4000 h because the oil temperature is higher in units with
energy recovery.

Thermostatic bypass valves

The inserts (thermostats) must be replaced by new ones when abnormal function is noticed.
Examples: regulating temperature is not within the normal range, ER heat exchanger remains
cold,...

Heat exchanger (HE)

If the temperature rise over the energy recovery system declines over a period of time with the
same basic working conditions, the heat exchanger should be inspected. To clean the oil side, soak
the heat exchanger in a degreasing solution. To remove scale formation in the water compartment,
a proper descaling process should be applied. Consult your customer centre.

4.5 Energy recovery data

Reference conditions
See section Reference conditions and limitations.

Effective working pressure

Consult section Compressor data for the normal working pressure.

Maximum allowed pressure of the heat exchanger

Oil side 15 bar (217 psi)

Water side 10 bar (145 psi)

Reading settings
In addition to other data, the following temperatures can be read on the controller display:
• The water inlet temperature of the energy recovery system
• The water outlet temperature of the energy recovery system
For water-cooled units:
• The water inlet temperature of the energy recovery system
• The water outlet temperature of the energy recovery system
• The cooling water outlet temperature of the compressor

Modifying settings
If the programmed warning settings for the water temperatures are exceeded, a warning indication
is shown on the controller:

56 2920 7196 21
Instruction book

Minimum Nominal Maximum

Temperature input
setting setting setting
Water inlet temperature of energy recovery ˚C 0 50 99
Water inlet temperature of energy recovery ˚F 32 122 210
Depends on
Energy recovery water outlet temperature ˚C 0 99
application
Depends on
Energy recovery water outlet temperature ˚F 32 210
application

To modify a setting, consult the relevant section in the description of the controller.

Recoverable energy
The recoverable energy can be calculated from:
RECOVERED ENERGY (kW) = 4.2 x water flow (l/s) x water temperature rise (˚C)
In the tables below, typical examples are given.

Data for low temperature rise/low water flow systems

Parameter Unit GA 37+ GA 45+

Recoverable energy kW 32.5 41.2
Recoverable energy hp 43.5 55.2
Water flow l/min 46.6 59
Water flow cfm 1.6 2.1
Temperature at inlet ˚C 50 50
Temperature at inlet ˚F 122 122
Temperature at outlet ˚C 60 60
Temperature at outlet ˚F 140 140

Data for high temperature rise/low water flow systems

Parameter Unit GA 37+ GA 45+

Recoverable energy kW 32.5 41.2
Recoverable energy hp 43.5 55
Water flow l/min 6.5 8.2
Water flow cfm 0.23 0.29
Temperature at inlet ˚C 20 20
Temperature at inlet ˚F 68 68
Temperature at outlet ˚C 92 92
Temperature at outlet ˚F 197 197

2920 7196 21 57
 Instruction book

4.6 Cooling water requirements

General

Cooling water needs to fulfill certain requirements in order to avoid problems of

scaling, fouling, corrosion or bacterial growth.
In open circuit cooling towers, protective measures must be taken to avoid the
growth of harmful bacteria such as legionella pneumophila when there is a risk
of inhalation of the water droplets.

No general recommendation can encompass the effects of all combinations of the various
compounds, solids and gases typically found in cooling water in interaction with different materials.
Therefore the recommendations formulated in our Cooling Water Specifications are a general guide
line for acceptable coolant quality. However, where strict limits apply, a statement is made in the
specification.
The water requirements refer to untreated water. When water is treated, some parameters will
change. Water treatments should be carried out by a specialized water treatment company, taking
the responsibility for the performance of the treated cooling water and the compatibility with the
materials in the cooling circuit. This includes not only the selection of the appropriate additives, but
also the correct application, monitoring of concentrations and properties, prevention of sludge
formation and maintenance of the system. This applies also to treatment with antifreeze products.
They must be provided with suitable stabilizers and inhibitors. Specifications are also depending on
the type of cooling circuit (open, once through / recirculating with tower / closed) and on the
application (Standard – max 65 °C cooling water temperature at the outlet) or Energy Recovery
(water temperature up to 95 °C).
In case water is not in line with recommended values or if any doubt, consult the manufacturer.

Cooling water parameters

1. pH
The effect of pH is already included in the Ryznar Stability Index (RSI - see item 4 below), but
also the pH itself is subject to limitations:

pH
Type of cooling system Materials Standard Energy recovery
Containing copper 6.8 - 9.3 6.8 - 9.3
Stainless steel with
Single pass carbon steel and / or 6.8 - 9.3 6.8 - 9.3
cast iron
Stainless steel only 6 - 9.3 6 - 9.3
Containing copper 6.8 - 9.3 not applicable
Stainless steel with
Recirculating (with
carbon steel and / or 6.8 - 9.3
tower)
cast iron
Stainless steel only 6 - 9.3

58 2920 7196 21
Instruction book

pH
Type of cooling system Materials Standard Energy recovery
Containing copper 7.5 - 9.3 7.5 - 9.3
Stainless steel with
Closed loop carbon steel and / or 7.5 - 9.3 7.5 - 9.3
cast iron
Stainless steel only 6 - 9.3 6 - 9.3

The values in bold are rejection limits.

When the system contains Zn or Al, the pH must be < 8.5.
2. Total dissolved solids (TDS) and conductivity
The conductivity is expressed in μS/cm, the TDS in ppm.
Both parameters are related with each other. The conductivity is convenient for quick
monitoring of general water quality, but the TDS is required for calculating the RSI. If only one
of both parameters is measured, an estimation can be obtained by using a theoretical
conversion factor (0.67):
TDS = conductivity x 0.67
3. Hardness
Different types of hardness are in relation with each other and together with the pH and the
alkalinity of the water they determine the equilibrium situation of the water, determined and
specified by the RSI.
In addition, the calcium hardness must be limited to:

Ca (ppm Ca CO3)
Type of cooling system Standard Energy recovery
Single pass < 500 <2
Recirculating (with tower) < 500 not applicable
Closed loop < 1000 < 50

4. The Ryznar Stability Index (RSI)

The Ryznar Stability Index is a parameter for predicting whether water will tend to dissolve or
precipitate calcium carbonate. The adhesion of scaling depositions and their effect are different
on different materials, but the equilibrium of the water (scaling or corrosive) is only determined
by its actual pH value and by the saturation pH value (pHs). The saturation pH value is
determined by the relationship between the calcium hardness, the total alkalinity, the total solids
concentration and the temperature.
The Ryznar Stability Index is calculated as follows:
RSI = 2*pHs - pH,
in which
• pH = measured pH (at room temp) of the water sample
• pHs= pH at saturation
pHs is calculated from:
pHs = (9.3 + A + B) - (C + D),

2920 7196 21 59
 Instruction book

in which
• A : depends on the total solids concentration
• B : depends on the water temperature at the outlet of the heat exchanger
• C : depends on the calcium hardness (CaCO3)
• D : depends on the HCO3- concentration or M-alkalinity
The values of A, B, C and D can be found in below table:

Total A Temperature B Ca hardness C M- D

dissolved (°C) (ppm CaCO3) Alkalinity
solids (ppm
(mg/l) CaCO3)
< 30 0.1 0-1 2.3 9 - 11 0.6 10 - 11 1.0
30 - 320 0.2 2-6 2.2 12 - 14 0.7 12 - 14 1.1
> 320 0.3 7 - 11 2.1 15 - 17 0.8 15 - 17 1.2
12 - 16 2.0 18 - 22 0.9 18 - 22 1.3
17 - 22 1.9 23 - 28 1.0 23 - 28 1.4
23 - 27 1.8 29 - 35 1.1 29 - 35 1.5
28 - 32 1.7 36 - 44 1.2 36 - 44 1.6
33 - 38 1.6 45 - 56 1.3 45 - 56 1.7
39 - 43 1.5 57 - 70 1.4 57 - 70 1.8
44 - 49 1.4 71 - 89 1.5 71 - 89 1.9
50 - 55 1.3 90 - 112 1.6 90 - 112 2.0
56 - 61 1.2 113 - 141 1.7 113 - 141 2.1
62 - 67 1.1 142 - 177 1.8 142 - 177 2.2
68 - 73 1.0 178 - 223 1.9 178 - 223 2.3
74 - 79 0.9 224 - 281 2.0 224 - 281 2.4
80 - 85 0.8 282 - 355 2.1 282 - 355 2.5
86 - 91 0.7 356 - 446 2.2 356 - 446 2.6
92 - 95 0.6 447 - 563 2.3 447 - 563 2.7
564 - 707 2.4 564 - 707 2.8
708 - 892 2.5 708 - 892 2.9
893 - 1000 2.6 893 - 1000 3.0

Interpretation of the values obtained:

• RSI < 6: boiler scale formation
• 6 < RSI < 7: neutral water
• RSI > 7: corrosive water

As a general rule, the RSI index should be between 5.6 and 7.5. If that is not the
case, contact a specialist.

5. Free chlorine (Cl2)

Disinfecting with chlorine is not done in closed systems, neither in energy recovery
systems.
A continuous level of 0.5 ppm should not be exceeded. For shock treatments, a maximum limit
of 2 ppm for maximum 30 minutes/day applies.

60 2920 7196 21
Instruction book

6. Chlorides (Cl-)
Chloride ions will create pitting corrosion on stainless steel. Their concentration should be
limited, depending from the RSI value.

5.6 < RSI < 6.3 < RSI < 6.9 < RSI <
RSI < 5.5 7.6 < RSI
6.2 6.8 7.5
Cl- (ppm) 200 350 500 350 200

For energy recovery systems, the limit is 100 ppm.

7. Sulphates (SO42-)

Sulphate (ppm)
Type of cooling system Standard Energy recovery
Single pass < 1000 < 200
Recirculating (with tower) < 1000 not applicable
Closed loop < 400 < 200

8. Iron and Manganese

Dissolved iron (ppm) Dissolved manganese (ppm)

Type of cooling Standard Energy Standard Energy
system recovery recovery
Single pass <1 < 0.2 < 0.2 < 0.05
Recirculating
<1 not applicable < 0.2 not applicable
(with tower)
Closed loop <1 < 0.2 < 0.2 < 0.05

The values in bold are rejection limits.

9. Copper

Copper (ppm)
Type of cooling system Standard Energy recovery
Single pass <1 < 0.2
Recirculating (with tower) <1 not applicable
Closed loop <1 < 0.2

10. Ammonium
The limit of 0.5 ppm is a rejection limit.
The limitation only applies for copper containing systems.
11. Suspended solids
Large particles (size > 10 µm) should not be present as they can be filtered out.
Small particles (< 0.5 µm) are not taken into account.
For particles between 0.5 µm and 10 µm, the following limits apply:

2920 7196 21 61
 Instruction book

Suspended solids (ppm)

Type of cooling system Standard Energy recovery
Single pass < 10 <1
Recirculating (with tower) < 10 not applicable
Closed loop < 10 <1

12. Oil or grease

< 1 ppm (rejection value)
13. Biology
If biology is present, it must be aerobic. Anaerobic biology (in closed systems) must be avoided.

Biology (CFU/ml)
Type of cooling system Standard Energy recovery
Single pass < 105 / < 107 < 103 / < 105
Recirculating (with tower) < 105 / < 107 not applicable
Closed loop < 103 / < 105 < 103 / < 105

The table shows the recommended values. The values in bold are rejection limits.

If additives are used in the cooling water, take into account that the cooling
capacity will change.
Δm = ((Cpw - Cpa) * X) / (Cpw *(1-X) + X*Cpa) * 100 %
with
Δm: change of mass flow of the coolant
Cpw: specific heat capacity of water
Cpa: specific heat capacity of the additives
X: the percentage of additives

62 2920 7196 21
Instruction book

5 Installation

5.1 Dimension drawings

The dimension drawing can be found in the technical documentation, supplied with the unit.

Dimension drawing Model

9828 5324 39-01 GA 37+, GA 45+ Pack, air-cooled, metric units
9828 5324 39-02 GA 37+, GA 45+ Pack, air-cooled, imperial units
9828 5324 49-01 GA 37+, GA 45+ Pack, water-cooled, metric units
9828 5324 49-02 GA 37+, GA 45+ Pack, water-cooled, imperial units
9828 5324 47 -01 GA 37+, GA 45+ Full-Feature, air-cooled, metric units
9828 5324 47 -02 GA 37+, GA 45+ Full-Feature, air-cooled, imperial units
9828 5324 50 -01 GA 37+, GA 45+ Full-Feature, water-cooled, metric units
9828 5324 50 -02 GA 37+, GA 45+ Full-Feature, water-cooled, imperial units

Text on drawings Translation or Explanation

Cooling air outlet of compressor Cooling air outlet of compressor and motor
Air inlet of compressor Cooling air inlet of compressor and motor
Compressed air outlet Compressed air outlet connection
Electrical cable passage Electrical cable passage
Cooling air outlet of cubicle Cubicle cooling air outlet
Doors fully open Dimensions with doors fully open
Cooling air inlet of dryer Dryer cooling air inlet
Cooling air outlet of dryer Dryer cooling air outlet
Centre of gravity Centre of gravity
Approx. mass Approximate mass of the machine
Manual drain of after cooler Manual drain, aftercooler
Connection of the automatic drain of the
Automatic drain of after cooler
aftercooler
Manual drain of dryer Manual drain of the dryer
Automatic drain of dryer Connection of the automatic drain of the dryer
Only for energy recovery option Only for energy recovery option
Water inlet (energy recovery) Water inlet (energy recovery option)
Water outlet (energy recovery) Water outlet (energy recovery option)
Mounting holes of compressor Mounting holes to fixate the compressor

5.2 Installation proposal

Safety

The operator must apply all relevant safety precautions, including those mentioned
in this book.

2920 7196 21 63
 Instruction book

Outdoor/altitude operation

The compressor is not designed for outdoor installation.

The compressors can be sold with option rain protection. With this option, this
compressor can be installed outside under a shelter, in frost free conditions. If frost
might occur, the appropriate measures must be taken to avoid damage to the
machine and its ancillary equipment. Consult Atlas Copco.

Moving/lifting

The compressor can be moved by a lift truck using the slots in the frame. Take
care not to damage the bodywork during lifting or transport. 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 is lifted
perpendicularly. Lift gently and avoid twisting.

In case of units equipped with the Lifting Device Option, it is not allowed to lift
the compressor if the canopy parts or lifting supports are not completely
installed. When the compressor is being lifted, it is also forbidden to come under
the load or to perform maintenance activities to it.

64 2920 7196 21
Instruction book

Compressor room example

Reference Designation
(1) Ventilation proposals
(2) Minimum free area to be reserved for the compressor installation

Table 3: Text on drawing

All piping to be connected stress-free to the compressor.

Installation guidelines
1. Install the compressor unit on a solid, level floor suitable for taking its weight.

2920 7196 21 65
 Instruction book

2. Position of the compressed air outlet valve.

3. The pressure drop over the air delivery pipe can be calculated from:

Δp = (L x 450 x Qc1.85) / (d5 x P), with

• Δp = pressure drop in bar (recommended maximum: 0.1 bar (1.5 psi))

• L = length of the pipe in m
• Qc= Free air delivery of the compressor in l/s
• d = inner diameter of the pipe in mm
• P = absolute pressure at the compressor outlet in bar(a)
It is recommended that the connection of the compressor air outlet pipe is made on top of the
main air net pipe in order to minimise carry-over of possible condensate residue.
4. Ventilation: the inlet grids and ventilation fan should be installed in such a way that any re-
circulation of cooling air is avoided.
The maximum air velocity through the grids is 5 m/s (16.5 ft/s).
The maximum air temperature at the compressor intake is 46 °C (115 °F), the minimum air
temperature is 0 °C (32 °F).
The required ventilation capacity to limit the compressor room temperature can be
calculated as follows:

Qv = 1.06 N/ΔT for versions without dryer

Qv = (1.06 N + 1.3)/ΔT for versions with dryer

• Qv = Required ventilation capacity in m3/s

• N = Shaft input of compressor in kW
• ΔT = Temperature increase in the compressor room in °C
5. The drain pipes to the drain collector must not dip into the water of the drain collector. Any flow
back must be avoided. Oil/water separators to separate the major part of the oil from the
condensate to ensure that the condensate meets the requirements of the environmental codes
are available.
6. Control module with monitoring panel.
7. Position of the main cable entry. Power supply cable to be sized and installed by a qualified
electrician.

To preserve the protection degree of the electric cubicle and to protect its
components from dust from the environment, it is mandatory to use a proper cable
gland when connecting the supply cable to the compressor.

8. Provision for inlet and outlet of the energy recovery system (system is optional).
9. The air receiver (optional) should be installed in a frost-free room on a solid, level floor for
normal air consumption, the volume of the air net (receiver and piping) can be calculated as
follows:

V=(0.25 x Qc x P1 x To)/(fmax x ΔP xT1)

• V= Volume of the air net in l.

66 2920 7196 21
Instruction book

• Qc= Free air delivery of the compressor in l/s

• P1= Compressor air inlet pressure in bar absolute
• fmax= Cycle frequency =1 cycle/30s
• ΔP= P unload - P load in bar
• T1= Compressor air inlet temperature in K
• To= Air receiver temperature K
10. To prevent feedback of exhaust air to the cooling inlet, sufficient space should be foreseen
above the unit to evacuate the exhaust air.

5.3 Electrical connections

Important remark

To preserve the protection degree of the electric cubicle and to protect its components
from dust from the environment, it is mandatory to use a proper cable gland when
connecting the supply cable to the compressor.

Figure 18: Electrical connections

Reference Designation
(1) Customer’s installation
(2) All voltages (50 and 60 Hz)

Instructions
1. Provide an isolating switch.
2. Check that the motor cables and wires inside the electric cabinet are clamped tight to their
terminals.

2920 7196 21 67
 Instruction book

3. Check the fuses and the setting of the overload relay. See section Electrical cable size.
4. Connect earth conductor bolt (PE).
5. Connect the power supply cables to their terminals L1, L2, L3.

Compressor status indication

On compressors equipped with an Elektronikon™ Touch controller, the controller is provided with
potential free auxiliary NO contacts (NO = normally open) (K05, K07 and K08) for remote indication
of:
• Manual load/unload or automatic operation (K07)
• Warning condition (K08)
• Shut-down condition (K05)
Example: K05 is a NO (NO = normally open) contact. It will be closed if all conditions are normal
and will open in case of power failure or shutdown.
Maximum contact load: 10 A / 250 V AC.
Stop the compressor and switch off the voltage before connecting external equipment. Consult your
supplier.

Compressor control mode

On compressors equipped with an Elektronikon™ Touch controller, consult section Quick access
screen if it is desired to switch to another control mode.
The following control modes can be selected:
• Local control: The compressor will react to commands entered by means of the buttons on the
control panel. Compressor start/stop commands via Clock function are active, if programmed.
• Remote control: The compressor will react to commands from external switches. Emergency
stop remains active. Compressor start/stop commands via Clock function are still possible.
Options:
• Remote starting and stopping (switch S1')
• Remote loading/unloading (switch S4')
• Remote pressure sensing (switch S' combined with pressure switch S4')

Have the modifications checked by your supplier.

Stop the compressor and switch off the voltage before connecting external
equipment.
Only potential-free contacts are allowed.

• LAN control: The compressor is controlled via a local network. Consult your supplier.

68 2920 7196 21
Instruction book

5.4 Pictographs
Description

1 2

3 4

5 6

7 8

9 10

11 12

2920 7196 21 69
 Instruction book

13 14

15

Table 4: Pictographs

Reference Designation
Warning: Always read the manual, switch off the voltage, depressurise
1
compressor and lock out/ tag out before repairing.
2 Keep the doors closed during operation
3 Switch off the voltage before removing protecting cover inside electric cubicle
4 Warning, voltage
5 Automatic condensate drain
6 Stop the compressor before cleaning the coolers
Lightly oil the gasket of the oil filter, screw it on and tighten by hand (approx.
7
half a turn)
Before connecting the compressor electrically, consult the Instruction book for
8
the motor rotation direction
9 Compressor remains pressurized for 180 seconds after switching off the voltage
10 Torques for steel (Fe) or brass (CuZn) bolts
11 Switch off the voltage and wait at least 6 minutes before removing the screen
12 Oil outlet (option UD+ filters)
13 Cooling water inlet
14 Cooling water outlet
15 Automatic Restart After Voltage Failure (ARAVF)

70 2920 7196 21
Instruction book

6 Operating instructions

6.1 Initial start-up

The operator must apply all applicable Safety precautions.

For the location of the air outlet valve and the drain connections, see sections
Introduction and Condensate system.

Preparations
1. Consult the sections Electrical cable size, Installation proposal and Dimension drawings.
2. The following transport fixtures, painted red, must be removed:
• Bolt and bushes or support under the motor (1)
• Bolts and bushes under the gear casing (2)
• Bolts or bolts and bushes under the oil separator vessel (3)

3. Check that the electrical connections correspond to the applicable codes and that all wires are
clamped tight to their terminals.
The installation must be earthed and protected against short circuits by fuses of the inert type in
all phases. An isolating switch must be installed near the compressor.
4. 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.

2920 7196 21 71
 Instruction book

Figure 19: Electric cubicle

5. Check the setting of circuit breaker (Q15). Also check that the switch on the circuit breaker is in
position I.
6. Fit air outlet valve (AV). See section Introduction for the location of the valve.
Close the valve.
Connect the air net to the valve.
7. Connect the condensate drain outlet(s) to a drain collector.
See section Condensate system.
The drain pipes to the drain collector must not dip into the water. If there is a risk for freezing,
the pipes must be insulated.
For draining of pure condensate water, install an oil/water separator which is available from
Atlas Copco as an option.
8. For compressors with a DD or a UD+ filter: connect the automatic drain of the filters to a
suitable drain collector.
9. 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 (if
activated, consult Atlas Copco).

72 2920 7196 21
Instruction book

Initial start procedure

If the compressor has not run for the past 6 months, it is strongly recommended
to improve the lubrication of the compressor element before starting.
To do so:
1. Disconnect the inlet hose.
2. Remove the unloader (UA).
3. Pour approximately 0.75 l (0.20 US gal, 0.17 Imp gal) of compressor oil into
the compressor element inlet. For oil specifications, see section Oil
specifications.
4. Reinstall the unloader and reconnect the inlet hose.
Make sure that all connections are tight.

Figure 20: Location of unloader

1. Check the oil level before starting.

The oil level should be between the oil filler neck (FC) and the bottom of the sight glass (Gl).

2920 7196 21 73
 Instruction book

2. 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.
Incorrect rotation direction of the drive motor may cause damage to the compressor.
3. 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).
4. Start and run the compressor for a few minutes. Check that the compressor operates normally.
5. Check that the outlet temperature doesn’t rise too much after start-up. The unit will shutdown
when the outlet temperature is 65°C (149°F) above the inlet temperature.

6.2 Before starting

Procedure
1. If the compressor has not run for the past 6 months, it is strongly recommended to improve the
lubrication of the compressor element before starting. See section Initial start.
2. Check oil level. Top up if necessary.

74 2920 7196 21
Instruction book

Figure 21: Position of oil level sight glass

3. If necessary, empty the dust trap of the filter, see section Air filter.
If the red part of the air filter service indicator shows full out, replace the air filter element. Reset
the service indicator (VI) by pushing the knob in the extremity of the indicator.

Figure 22: Position of air filter and service indicator

6.3 Starting

For the position of the air outlet valve and the drain connections, see sections
Introduction and Condensate system.

2920 7196 21 75
 Instruction book

Figure 23: Control panel Elektronikon™ Touch

Procedure
1. Open the air outlet valve.
2. Switch on the voltage. Check that voltage on LED (5) lights up.
3. Press start button (7) on the control panel. The compressor starts running and the automatic
operation LED (4) lights up. Ten seconds after starting, the drive motor switches over from star
to delta and the compressor starts running loaded.

6.4 During operation

Warnings

The operator must apply all relevant Safety precautions. Also consult section
Problem solving.
Keep the doors closed during operation. They may be opened for short periods
only to carry out checks.
When the motors are stopped and LED (4) (automatic operation) is alight, the
motors may start automatically.

76 2920 7196 21
Instruction book

Checking the oil level

Figure 24: Control panel Elektronikon™ Touch

Regularly check the oil level. To do so:

1. Press stop button (6).
2. A few minutes after stopping, the oil level should be between the oil filler neck (FC) and the
bottom of the sight glass (Gl).
3. If the oil level is too low, push the emergency stop button to avoid the compressor to start
unexpectedly.

2920 7196 21 77
 Instruction book

4. Next, close the air outlet valve and open the manual drain valve (Dm) until the air system
between oil separator/air receiver vessel and outlet valve is fully depressurized. See section
Condensate system for location of the outlet valve and water drain.
5. Unscrew oil filler plug (FC) one turn to permit any pressure left in the system to escape. Wait a
few minutes.
6. Remove the plug and add oil until the level reaches the filler opening.
7. Fit and tighten the plug (FC).
On compressors equipped with an Elektronikon™ Touch controller, unlock the emergency stop
button, select the STOP icon on the display and press reset before restarting.

Air filter

Figure 25: Position of the service indicator

Regularly check the service indicator. If the colored part of service indicator (VI) shows full out,
replace the air filter element. Reset the service indicator by pushing the knob in the extremity of the
indicator body.

Drains
Regularly check that condensate is discharged during operation. See section Condensate system.
The amount of condensate depends on environmental and working conditions.

6.5 Checking the display

Compressors with Elektronikon™ Touch controller:

78 2920 7196 21
Instruction book

Figure 26: Control panel Elektronikon™ Touch

Check the main screen (1) regularly for readings and messages. The display normally shows the
compressor. outlet pressure, while the status of the compressor is indicated by pictographs.
Remedy the trouble if alarm LED (2) is lit or flashes, see section Shutdown warning, Shutdown and
Problem solving.
The panel will show a service indication (3) if a service plan interval has been exceeded or if a
service level for a monitored component has been exceeded.
Carry out the service actions of the indicated plans or replace the component and reset the relevant
timer, see section Service warning.

2920 7196 21 79
 Instruction book

6.6 Stopping

Figure 27: Control panel Elektronikon™ Touch

Procedure

Step Action
Press stop button (6). Automatic operation LED (4) goes out and the compressor
1
stops after 30 seconds of unloaded operation.
To stop the compressor in the event of an emergency, press emergency stop
button. Alarm LED flashes (2).
• On compressors equipped with an Elektronikon™ controller, remedy the problem
2
cause and unlock the button by pulling it out.
• To reset the alarm, see Data menu.
Do not use emergency stop button (10) for normal stopping!
3 Close the air outlet valve.
Press the test button on top of the electronic water drain(s) (if supplied) to the
depressurize the piping between air receiver and outlet valve, next open the manual
4
drain valve (Dm). See section Condensate system.
Switch off the voltage.

80 2920 7196 21
Instruction book

6.7 Taking out of operation

Warning

The operator must apply all relevant Safety precautions.

Procedure

Step Action
- Stop the compressor and close the air outlet valve.
Press the test button on top of the electronic water drain(s) until the air system
- between air receiver and outlet valve is fully depressurized. Consult section
Condensate system to locate the drain valve.
- Switch off the voltage and disconnect the compressor from the mains.
- Open the condensate drain valve(s) (Dm).
Unscrew the oil filler plug only one turn to permit any pressure in the system to
- escape.
Consult section Oil and oil filter change to locate the filler plug.
Shut off and depressurise 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 oil.
Drain the condensate circuit and disconnect the condensate piping from the
-
condensate net.

2920 7196 21 81
 Instruction book

7 Maintenance

7.1 Preventive maintenance schedule

Warning

Always apply all relevant Safety precautions.

Before carrying out any maintenance, repair work or adjustments, proceed
as follows:
• Stop the compressor.
• Close the air outlet valve and open the manual drain valve until the air
system between air receiver and outlet valve is fully depressurized.
• Press the emergency stop button.
• Switch off the voltage. Open and lock the isolating switch.
• Depressurize the compressor by opening the oil filler plug one turn.
Only pressing the emergency stop button is not sufficient to make the
compressor voltage free.
If the machine is equipped with an automatic restart after voltage failure function
and if this function is active, be aware that the machine will restart automatically
when the power is restored if it was running when the power was interrupted.

Warranty - Product Liability

Use only authorized parts. Any damage or malfunction caused by the use of unauthorized parts is
not covered by Warranty or Product Liability.

Service kits
For overhauling or carrying out preventive maintenance, service kits are available. Consult the
Spare Parts list for part numbers.

Service contracts
Atlas Copco offers several types of service contracts, relieving you of all preventive maintenance
work. Consult your Atlas Copco Customer Center.

General
When servicing, replace all removed O-rings and washers.

Intervals
The local customer centre may overrule the maintenance schedule, especially the service intervals,
depending on the environmental and working conditions of the compressor.
The longer interval checks must also include the shorter interval checks.

Regular maintenance
Following actions have to be done on a regular basis:

82 2920 7196 21
Instruction book

Period Operation
Check oil level.
Check readings on the controller display.
Check the air filter service indicator.
Daily Check that condensate is discharged during operation of the compressor.
Drain condensate.
Check the pressure dew point temperature (on compressors with integrated
dryer).
Check coolers. Clean if necessary.
Check cooling fins of electric motor(s). Clean if necessary.
Remove the air filter element and inspect. If necessary, clean using an air jet.
Replace damaged or heavily contaminated elements.
Check the filter element of the electric cabinet. Replace if necessary.
On compressors with integrated dryer:

3-monthly (1) • Stop the compressor, close the air outlet valve and switch off the voltage.
• Remove any dirt from the condenser inlet with a vacuum cleaner.
• Next, clean with an air jet in the reverse direction of the normal flow. Use low
pressure air. Keep the compressed air nozzle more than 30 cm away from
the condenser to avoid damaging the condenser fins.
• Remove dust from inside the dryer, e.g. with a vacuum cleaner.
Do not use water or solvents to clean the condenser.
Yearly Check the condition of all hoses. Replace if necessary.

Table 5: Maintenance checklist

(1): More frequently when operating in a dusty atmosphere

Programmed service interventions

Apart from the above mentioned actions, a number of service interventions (see the table below)
are programmed in the controller. Each plan has a programmed time interval at which all service
actions belonging to that plan are to be carried out. When reaching the interval, a message will
appear on the screen indicating which service plans are to be carried out.
See section Service menu for compressors with an Elektronikon™ Touch controller.
After servicing, the intervals must be reset.

A-service B-service D-Service

Every 4000 Every 8000 Every 24000
running hours (1) running hours (2) running hours
Check measured parameters x x x
Record SPM measurements x x x
Change the air filter x x x
Change the electric cabinet filter
x x x
mats
Change the oil x (3) x x
Change the oil filter x (3) x x
Change the oil separator element x x

2920 7196 21 83
 Instruction book

Overhaul non return valve of the

x x
scavenge line
Overhaul the unloader x x
Overhaul the minimum pressure
x x
valve
Change the thermostatic valve x x
Overhaul the condensate drain(s) x x
Change the non-drive end bearing of
x
the motor

Table 6: Preventive Maintenance schedule programmed in the Elektronikon™

(1): or yearly (indicated by real time counter), whichever comes first.

(2): or every 2 years (indicated by real time counter), whichever comes first.
(3): or as indicated by fluid analysis.

• Consult your supplier before modifying a timer setting.

• For the change interval of oil and oil filter in extreme conditions consult your
customer centre.
• Any leakage should be attended to immediately. Damaged hoses or flexible
joints must be replaced.

7.2 Oil specifications

It is strongly recommended to use genuine lubricants from your manufacturer. They are the result of
years of field experience and research. See section Preventive maintenance schedule for the
advised replacement intervals and consult the Spare Parts list for part number information.

Avoid mixing lubricants of different brands or types as they may not be

compatible and the oil mix may have inferior properties. A label, indicating the
type of oil filled ex factory, is stuck on the air receiver/oil tank or on the
compressor frame.

Roto-Inject Fluid Ndurance

Atlas Copco's Roto-Inject Fluid Ndurance is a specially developed lubricant for use in single stage
oil injected screw compressors. Its specific composition keeps the compressor in excellent
condition.
See the table below for oil exchange intervals:

Ambient temperature Element outlet Exchange interval Maximum time

temperature interval
up to 30°C (95°F) up to 95°C (203°F) 4000 1 year
from 30°C (86°F) up to from 95°C (203°F) up
3000 1 year
35°C (95°F) to 100°C (212°F)

84 2920 7196 21
Instruction book

Ambient temperature Element outlet Exchange interval Maximum time

temperature interval
from 35°C (95°F) up to from 100°C (212°F) up
2000 1 year
40°C (104°F) to 105°C (221°F)
use ROTO-Xtend Duty use ROTO-Xtend Duty
above 40°C (104°F) above 105°C (221°F)
Fluid Fluid

RS Ultra
Atlas Copco's RS Ultra oil is a specially developed lubricant for use in single stage oil injected
screw compressors. Its specific composition keeps the compressor in excellent condition.
See the table below for oil exchange intervals:

Ambient temperature Element outlet Exchange interval Maximum time

temperature interval
up to 35°C (95°F) up to 100°C (212°F) 6000 2 years
from 35°C (95°F) up to from 100°C (212°F) up
4000 2 years
40°C (104°F) to 105°C (221°F)
from 40°C (104°F) up from 105°C (221°F) up
2000 2 years
to 45°C (113°F) to 110°C (230°F)

Roto-Xtend Duty Fluid

Atlas Copco's Roto-Xtend Duty Fluid is a high quality synthetic lubricant for oil-injected screw
compressors which keeps the compressor in excellent condition.
See the table below for oil exchange intervals:

Ambient temperature Element outlet Exchange interval Maximum time

temperature interval
up to 35°C (95°F) up to 100°C (212°F) 8000 2 years
from 35°C (95°F) up to from 100°C (212°F) up
6000 2 years
40°C (104°F) to 105°C (221°F)
above 40°C (104°F) above 105°C (221°F) 5000 2 years

Roto-Foodgrade Fluid
Atlas Copco's Roto-Foodgrade Fluid is a unique high quality synthetic lubricant, specially created
for oil-injected screw compressors that provide air for the food industry.
See the table below for oil exchange intervals:

Ambient temperature Element outlet Exchange interval Maximum time

temperature interval
up to 35°C (95°F) up to 100°C (212°F) 4000 1 year
from 35°C (95°F) up to from 100°C (212°F) up
3000 1 year
40°C (104°F) to 105°C (221°F)

2920 7196 21 85
 Instruction book

Ambient temperature Element outlet Exchange interval Maximum time

temperature interval
from 40°C (104°F) up from 105°C (221°F) up
2000 1 year
to 45°C (113°F) to 110°C (230°F)
above 45°C (113°F) above 110°C (230°F) use not recommended use not recommended

7.3 Drive motor

General
Keep the outside of the electric motor clean for efficient cooling. If necessary, remove dust with a
brush and/or compressed air jet.

7.4 Air filter

Location of air filter

Recommendations
1. Never remove the element while the compressor is running.
2. For minimum downtime, replace the dirty element by a new one.
3. Discard the element when damaged.

Procedure
1. Stop the compressor. Switch off the voltage.
2. Release the snap clips of air filter (AF) and remove the cover and the air filter element. Discard
the filter element.
3. Fit the new element and the cover.
4. Reset service indicator (VI) by pushing the knob in the extremity of the body.
5. Reset the air filter service warning.
For compressors equipped with a Touch controller, see section Service menu.

86 2920 7196 21
Instruction book

7.5 Oil and oil filter change

Warning

The operator must apply all relevant Safety precautions.

Always drain the compressor oil at all drain points. Used oil left in the
compressor can contaminate the oil system and can shorten the lifetime of the
new oil.
Never mix lubricants of different brands or types as they may not be compatible
and the oil mix will have inferior properties. A label, indicating the type of oil filled
ex-factory, is stuck on the air receiver/oil tank.
If the compressor is equipped with an Energy Recovery system, also consult
Maintenance for Energy Recovery Systems.

Procedure

Figure 28: Oil drain and filler plug on the oil separator vessel

Figure 29: Vent plug, oil cooler

2920 7196 21 87
 Instruction book

Step Description
Run the compressor until warm. Stop the compressor after 3 minutes of unloaded
operation. Close the air outlet valve and switch off the voltage. Wait a few minutes and
1
depressurise by unscrewing oil filler plug (FC) just one turn to permit any pressure in the
system to escape.
2 Air cooled units: loosen the vent plug (VP) of the oil cooler and wait for 5 minutes.
3 Remove drain plug (DP1) and open drain valve (Dm).
Collect the oil in a collector and deliver it to the local collection service. Refit and tighten
4 the drain and vent plugs after draining.
Close the drain valve (Dm).
Remove the oil filter (OF). Be aware that this filter has a bayonet connection. Rotate
5 the filter across the vertical axis and push slightly upwards. Make sure the connection
interface is clean before mounting.
Remove filler plug (FC).
6 Fill the air receiver (AR) with oil until the level reaches the filler neck.
Take care that no dirt drops into the system. Refit and tighten filler plug (FC).
Run the compressor loaded for a few minutes. Stop the compressor and wait a few
7
minutes to allow the oil to settle.
Depressurise the system by unscrewing filler plug (FC) just one turn to permit any
pressure in the system to escape. Remove the plug.
8
Fill the air receiver with oil until the level reaches the filler neck.
Tighten the filler plug.
Reset the service warning after carrying out all service actions in the relevant Service
9 Plan:
For compressors with a Touch controller, see section Service menu.

7.6 Coolers
General
Keep the coolers clean to maintain their efficiency.

Instructions for air-cooled compressors

• Stop the compressor, close the air outlet valve and switch off the voltage.
• Cover all parts under the coolers.
• Remove the service plates. (1)

88 2920 7196 21
Instruction book

• Remove any dirt from the coolers with a fibre brush. Brush in the direction of the cooling fins.
Also remove any dirt from the fan with a fibre brush.
• Next, clean with an air jet in the reverse direction to normal flow. Use low pressure air. If
necessary, the pressure may be increased up to 6 bar(e) (87 psig).
• If it is necessary to wash the coolers with a cleaning agent, consult your supplier.
• Remove the cover used during cleaning.
• Mount the service plates. (1)

2920 7196 21 89
 Instruction book

7.7 Safety valves

Location of safety valve

Figure 30: Position of safety valve

Operating
Operate the safety valve from time to time by unscrewing the cap one or two turns. Retighten it
afterwards.

Testing
Before removing the valve, depressurize the compressor. See also section Problem solving.
The safety valve (SV) can be tested on a separate air line. If the valve does not open at the set
pressure stamped on the valve, it needs to be replaced.

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

7.8 Dryer maintenance instructions

Safety precautions
Refrigeration dryers of ID type contain refrigerant HFC.
When handling refrigerant, all applicable safety precautions must be observed. Please be
specifically aware of the following points:
• Contact of refrigerant with the skin will cause freezing. Special gloves must be worn. If
contacted with the skin, the skin should be rinsed with water. On no account may clothing be
removed.

90 2920 7196 21
Instruction book

• Fluid refrigerant will also cause freezing of the eyes; always wear safety glasses.
• Refrigerant is harmful. Do not inhale refrigerant vapours. Check that the working area is
adequately ventilated.
Be aware that certain components such as the refrigerant compressor and the discharge pipe can
become quite hot (up to 110 °C - 230 °F). Therefore, wait until the dryer has cooled down before
removing the panels.
Before starting any maintenance or repair work, switch off the voltage and close the air inlet and
outlet valves.

Local legislation
Local legislation may stipulate that:
• Work on the refrigerant circuit of the cooling dryer or on any equipment which influences its
function must be undertaken by an authorised control body.
• The installation should be checked once a year by an authorised control body.

General
For all references see section Introduction.
The following remarks should be kept in mind:
• Keep the dryer clean.
• Brush or blow off the finned surface of condenser monthly.
• Stop the compressor, close the air outlet valve and switch off the voltage.
• Remove any dirt on the condenser inlet with a vacuum cleaner.
• Next, clean with an air jet in the reverse direction to normal flow. Use low pressure air. If
necessary, the pressure may be increased up to 6 bar(e) (87 psig).
• Clean the condenser area with a vacuum cleaner.
• Inspect and clean the electronic condensate drain monthly.

7.9 Service kits

Service kits
For overhauling and for preventive maintenance, a wide range of service kits is available. Service
kits comprise all parts required for servicing the component and offer the benefits of genuine parts
while keeping the maintenance budget low.
Also a full range of extensively tested lubricants, suitable for your specific needs is available to
keep the compressor in excellent condition.
Consult the Spare Parts List for part numbers.

7.10 Storage after installation

Procedure
Run the compressor regularly, e.g. twice a week, until warm. Load and unload the compressor a
few times.

2920 7196 21 91
 Instruction book

If the compressor is going to be stored without running from time to time,

protective measures must be taken. Consult your supplier.

92 2920 7196 21
Instruction book

8 Problem solving
Warning

Always apply all relevant Safety precautions.

Before carrying out any maintenance, repair work or adjustment, press the stop
button, wait until the compressor has stopped and close the air outlet valve.
Open the manual drain valve(s).
Press the emergency stop button and switch off the voltage. Open and lock the
isolating switch.
Depressurise the oil separator vessel by opening the oil filler plug one turn.
For location of components: see sections Introduction, Condensate system and
Initial start.
The air outlet valve can be locked during maintenance or repair as follows:
• Close the valve.
• Remove the screw fixing the handle with the wrench delivered with the
compressor.
• Lift the handle and turn it until the slot of the handle fits over the blocking
edge on the valve body.
• Fit the screw.
• Always switch off the voltage. Only pressing the emergency stop button is
not sufficient to make the compressor voltage free.
• If the machine is equipped with an automatic restart after voltage failure
function and if this function is active, be aware that the machine will restart
automatically when the power is restored if it was running when the power
was interrupted.

Faults and remedies, compressor

For compressors with a Touch controller, see section Service menu.

Condition Fault Remedy

Compressor does not start or Find cause and remedy.
Motor overload relay (F21) open
stops during operation. Replace if necessary.
Circuit breaker (Q15) or fan Find cause and remedy.
motor overload (F15) open Replace if necessary.

2920 7196 21 93
 Instruction book

Condition Fault Remedy

Too high temperature in oil
separator vessel or temperature
switch (TSHH1) defective

Find cause and remedy.

Replace if necessary.

Phase sequence relay (K25) Find cause and remedy.

open Replace if necessary.
Find cause and remedy.
Wiring interrupted
Replace if necessary.
Compressor starts running, but
does not load after a delay Solenoid valve out of order Replace valve
time
Inlet valve stuck in closed
Have valve checked
position
Leak in control air tubes Replace leaking tubes
Minimum pressure valve leaking
Have valve checked
(when air net is depressurised)
Compressor does not unload, Solenoid valve out of order Replace valve
safety valve blows Inlet valve does not close Have valve checked
Condensate is not discharged
Check and correct as
from condensate separator Discharge tube clogged
necessary
during loading
Compressor air output or Air consumption exceeds air Check the connected
pressure below normal delivery of compressor equipment.
Choked air filter element Replace filter element
Solenoid valve malfunctioning Replace valve
Leak in control air tubes Replace leaking tubes
Oil separator element clogged Have element replaced
Air leakage Have leaks repaired.
Safety valve leaking Replace valve
Inlet valve does not fully open Have valve checked
Compressor element out of order Consult your supplier
Excessive oil consumption; oil
carry-over through discharge Incorrect oil causing foam Change to correct oil
line

94 2920 7196 21
Instruction book

Condition Fault Remedy

Check for overfilling. Release
Oil level too high pressure and drain oil to
correct level.
Oil separator defective Replace oil separator element
Safety valve blows after
Inlet valve malfunctioning Have valve checked
loading
Minimum pressure valve
Have valve checked
malfunctioning
Safety valve out of order Have valve replaced
Have oil separator element
Oil separator element clogged
replaced
Compressor element out of order Consult your supplier
Compressor element outlet
temperature or delivery air Oil level too low Check and correct
temperature above normal
Check for cooling air
restriction or improve
ventilation of the compressor
Insufficient cooling air or cooling
room. Avoid recirculation of
air temperature too high
cooling air. If installed, check
capacity of compressor room
fan
Oil cooler clogged Clean cooler
Bypass valve malfunctioning Have valve tested
Air cooler clogged Clean cooler
Compressor element out of order Consult your supplier
Unit shuts down due to
Fan rotates in the wrong
Cooling air fan does not deliver overtemperature, fan overload,
direction due to wrong
enough air. too high oil consumption or less
electrical connection.
FAD.

Faults and remedies, dryer

For all references hereafter, consult section Air dryer.

Condition Fault Remedy

Pressure dew point too Air inlet temperature too Check and correct; if necessary, clean
high high the aftercooler of the compressor
Check and correct; if necessary, draw
Ambient temperature too
cooling air via a duct from a cooler
high
place or relocate the compressor
Have circuit checked for leaks and
Shortage of refrigerant
recharged
Refrigerant compressor
See below
does not run
Evaporator pressure too
See below
high

2920 7196 21 95
 Instruction book

Condition Fault Remedy

Condenser pressure too
See below
high
Condenser pressure too Fan control switch out of
Replace
high or too low order
Fan blades or fan motor Have checked fan/fan motor, if
out of order necessary replace.
Check and correct; if necessary, draw
Ambient temperature too
cooling air via a duct from a cooler
high
place or relocate the compressor
Condenser externally
Clean condenser
clogged
Compressor stops or does Electric power supply to
Check and correct as necessary
not start compressor is interrupted
Thermal protection of
Motor will restart when motor windings
refrigerant compressor
have cooled down
motor has tripped
Have system inspected
Clean the filter of the drain by opening
Condensate drain remains the manual drain valve.
Drain system clogged
inoperative On units with an electronic drain, check
functioning of the drain by pushing the
test button.
Condensate trap
Have system checked. If necessary,
continuously discharges air Drain out of order
replace the drain.
and water
Hot gas bypass valve
Evaporator pressure is too
incorrectly set or out of Have hot gas bypass valve adjusted
high or too low at unload
order
Condenser pressure too
See above
high or too low
Have circuit checked for leaks and
Shortage of refrigerant
recharged if necessary

96 2920 7196 21
Instruction book

9 Technical data

9.1 Readings on display

Figure 31: Elektronikon™ Touch Controller

Important

The readings mentioned below are valid under the reference conditions (see
section Reference conditions and limitations).

Reference Reading
Air outlet pressure Modulates between programmed unloading and loading pressures.
Compressor element
Approx. 60 ˚C (108 ˚F) above cooling air inlet temperature.
outlet temperature
Dewpoint
See section Compressor data.
temperature

2920 7196 21 97
 Instruction book

9.2 Electric cable size and fuses

Important

• The voltage on the compressor terminals must not deviate more than 10% of
the nominal voltage.
It is however highly recommended to keep the voltage drop over the supply
cables at nominal current below 5% of the nominal voltage (IEC 60204-1).
• If cables are grouped together with other power cables, it may be necessary
to use cables of a larger size than those calculated for the standard
operating conditions.
• Use the original cable entry. See section Dimension drawings.
To preserve the protection degree of the electric cubicle and to protect
its components from dust from the environment, it is mandatory to use
a fitting cable gland when connecting the supply cable to the
compressor.
Use single core cables in conduit if two multicore cables do not fit in the
supply cable entrance.
• Local regulations remain applicable if they are stricter than the values
proposed below.
• Currents are calculated with the full service factor but we suggest to add
10% due to over- and under-voltage.
Fuses are maximum allowed values calculated for full service factor and
10% over- and under-voltage.
• Caution:
• Always double-check the fuse size versus the calculated cable size. If
required, reduce fuse size or enlarge cable size.
• Cable length should not exceed the maximum length according to IEC
60204 table 10.

Currents and fuses

Compressor type I tot Max. fuse (1) Max. fuse (2)

I (1) I (2) gL/gG gL/gG
V Hz A A A A
GA 37+ 230 60 149 160 200 200
GA 37+ 380 60 90 95 100 125
GA 37+ 400 50 85 89 100 100
GA 37+ 460 60 75 79 100 100
GA 45+ 230 60 183 196 200 224
GA 45+ 380 60 111 118 125 160
GA 45+ 400 50 104 108 125 125
GA 45+ 460 60 92 96 100 125

Table 7: IEC approval

98 2920 7196 21
Instruction book

Compressor type I tot Max. fuse (1) Max. fuse (2)

RK5/ RK5/
I (1) I (2)
HRC form II HRC form II
V Hz A A A A
GA 37+ 230 60 149 160 175 175
GA 37+ 460 60 75 79 90 90
GA 37+ 575 60 60 65 70 80
GA 45+ 230 60 183 194 200 225
GA 45+ 460 60 92 96 110 110
GA 45+ 575 60 74 78 90 90

Table 8: UL/cUL approval

I: current in the supply lines at maximum load and 10% undervoltage.

(1): compressors without integrated dryer
(2): compressors with integrated dryer
Fuse calculations for IEC are done according to 60364-4-43 Low-voltage electrical installations -
Part 4-43: protection against overcurrent. Fuse sizes are calculated in order to protect the cable
against short circuit.
Fuse calculations for cUL and UL: The indicated fuse size is the maximum fuse size in order to
protect the motor against short circuit. For cUL fuse HRC form II, for UL fuse class RK5.

Possible configurations
There are 3 possible cabling layouts:

• (1): Single supply cables.

• (2): Parallel supply cables
• (3) is only valid for Y-D versions

Cable sizing according to IEC

The tables below indicate the current carrying capacities of cables for commonly used installation
methods, calculated according to standard 60364-5-52 - electrical installations of buildings part 5 -
selection and erection equipment and section 52 - current carrying capacities in wiring systems.
The allowed currents are valid for PVC insulated cables with three loaded copper conductors. See
tables for maximum conductor temperature 70 °C and for maximum conductor temperature 90°C.

2920 7196 21 99
 Instruction book

Installation method B2 according to table B.52.1.

Multi-core cable in conduit on a wooden wall

Ambient temperature
Cable section 30 °C 40 °C 45 °C 50 °C 55 °C
4 mm² < 27 A < 23 A < 21 A < 19 A < 16 A
6 mm² < 34 A < 30 A < 27 A < 24 A < 21 A
10 mm² < 46 A < 40 A < 36 A < 33 A < 28 A
16 mm² < 62 A < 54 A < 49 A < 44 A < 38 A
25 mm² < 80 A < 70 A < 63 A < 57 A < 49 A
35 mm² < 99 A < 86 A < 78 A < 70 A < 60 A
50 mm² < 118 A < 103 A < 93 A < 84 A < 72 A
70 mm² < 149 A < 130 A < 118 A < 106 A < 91 A
95 mm² < 179 A < 156 A < 141 A < 127 A < 109 A
120 mm² < 206 A < 179 A < 163 A < 146 A < 126 A

Table 9: Maximum allowed current in function of the ambient temperature for installation
method B2

Installation method C according to table B.52.1.

Single-core or multi-core cable on a wooden wall

Ambient temperature
Cable section 30 °C 40 °C 45 °C 50 °C 55 °C
4 mm² < 32 A < 28 A < 25 A < 23 A < 20 A
6 mm² < 41 A < 36 A < 32 A < 29 A < 25 A
10 mm² < 57 A < 50 A < 45 A < 40 A < 35 A
16 mm² < 76 A < 66 A < 60 A < 54 A < 46 A
25 mm² < 96 A < 84 A < 76 A < 68 A < 59 A
35 mm² < 119 A < 104 A < 94 A < 84 A < 73 A
50 mm² < 144 A < 125 A < 114 A < 102 A < 88 A
70 mm² < 184 A < 160 A < 145 A < 131 A < 112 A
95 mm² < 223 A < 194 A < 176 A < 158 A < 136 A
120 mm² < 259 A < 225 A < 205 A < 184 A < 158 A

Table 10: Maximum allowed current in function of the ambient temperature for installation
method C

100 2920 7196 21

Instruction book

Installation method F according to table B.52.1.

Single core cables, touching in free air
Clearance to wall not less than one cable diameter

Ambient temperature
Cable section 30 °C 40 °C 45 °C 50 °C 55 °C
25 mm² < 110 A < 96 A < 87 A < 78 A < 67 A
35 mm² < 137 A < 119 A < 108 A < 97 A < 84 A
50 mm² < 167 A < 145 A < 132 A < 119 A < 102 A
70 mm² < 216 A < 188 A < 171 A < 153 A < 132 A
95 mm² < 264 A < 230 A < 209 A < 187 A < 161 A
120 mm² < 308 A < 268 A < 243 A < 219 A < 188 A
150 mm² < 356 A < 310 A < 281 A < 253 A < 217 A
185 mm² < 409 A < 356 A < 323 A < 290 A < 249 A
240 mm² < 485 A < 422 A < 383 A < 344 A < 296 A
300 mm² < 561 A < 488 A < 443 A < 398 A < 342 A
400 mm² < 659 A < 573 A < 518 A < 467 A < 402 A

Table 11: Maximum allowed current in function of the ambient temperature for installation
method F, conductor temperature 70°C

Ambient temperature
Cable section 30 °C 40 °C 45 °C 50 °C 55 °C
25 mm² < 135 A < 123 A < 117 A < 110 A < 103 A
35 mm² < 169 A < 154 A < 147 A < 139 A < 128 A
50 mm² < 207 A < 188 A < 180 A < 170 A < 157 A
70 mm² < 268 A < 244 A < 233 A < 220 A < 204 A
95 mm² < 328 A < 298 A < 285 A < 269 A < 249 A
120 mm² < 383 A < 349 A < 333 A < 314 A < 291 A
150 mm² < 444 A < 404 A < 386 A < 364 A < 337 A
185 mm² < 510 A < 464 A < 443 A < 418 A < 388 A
240 mm² < 607 A < 552 A < 528 A < 498 A < 461 A
300 mm² < 703 A < 639 A < 611 A < 576 A < 534 A
400 mm² < 823 A < 749 A < 716 A < 674 A < 625 A

Table 12: Maximum allowed current in function of the ambient temperature for installation
method F, conductor temperature 90°C

Calculation method for IEC:

• Single supply cables (3 phases + PE - configuration (1)):
• Add 10 % to the total compressor current (ItotPack or ItotFF from the tables)
• Install the prescribed fuse on each cable
• Parallel supply cable (2 x 3 phases + PE - configuration (2)):
• Add 10 % to the total compressor current (ItotPack or ItotFF from the tables) and divide by
2

2920 7196 21 101

 Instruction book

• Multiply the ampacity of the cables with 0.8 (see table A.52.17 (52-E1))
• Install fuses of half the size of the recommended maximum fuse size on each cable.
• When using 2 x 3 phases + PE as in (3):
• Add 10 % to the total compressor current (ItotPack or ItotFF from the tables) and divide by
√3
• Multiply the ampacity of the cables with 0.8 (see table A.52.17 (52-E1))
• Fuse size: the recommended maximum fuse size divided by √3 on each cable.
• Size of the PE cable:
• For supply cables up to 35 mm²: same size as supply cables
• For supply cables larger than 35 mm²: half the size of the supply wires
Always check the voltage drop over the cable (less than 5 % of the nominal voltage is
recommended).
• Example: Itot = 234 A, maximum ambient temperature is 45 °C, recommended fuse = 315 A
• Single supply cables (3 phases + PE - configuration (1)):
• I = 234 A + 10 % = 234 x 1.1 = 257.4 A
• The table for method F, 70 °C cable temperature and ambient temperature of 45 °C
allows a maximum current of 323 A for a 185 mm² cable. So use a 3 x 185 mm² +
95 mm² cable.
• If the table for method F, 90 °C cable temperature and ambient temperature of 45
°C is used, 120 mm² is sufficient. So a single cable 3 x 120 mm² + 70 mm² is
sufficient .
• Parallel supply cable (2 x 3 phases + PE - configuration (2)):
• I = (234 A + 10 %)/2 = (234 x 1.1)/2 = 128.7 A
• Install 160 A fuses on each cable instead of 315 A.
• For a cable of 95 mm², method F, 70 °C cable temperature and ambient
temperature of 45 °C, the maximum current is 209 A x 0.8 = 167.2 A. So 2 parallel
cables of 3 x 95 mm² + 50 mm² are sufficient.
• For a cable of 95 mm², method F, 90 °C cable temperature and ambient
temperature of 45 °C, the maximum current is 233 A x 0.8 = 186.4 A. So 2 parallel
cables of 3 x 70 mm² + 35 mm² are sufficient.

Cable sizing according to UL/cUL

Calculation method according to UL 508A, table 28.1 column 5: allowable ampacities of insulated
copper conductors (75 °C (167 °F)).

AWG or kcmil Maximum current

10 < 30 A
8 < 50 A
6 < 65 A
4 < 85 A
3 < 100 A
2 < 115 A
1 < 130 A
1/0 < 150 A
2/0 < 175 A

102 2920 7196 21

Instruction book

AWG or kcmil Maximum current

3/0 < 200 A

Table 13: Maximum allowed current in function of the wire size

Calculation method for UL:

• Single supply cables (3 phases + 1 PE - configuration (1)):
• Add 25 % to the total current from the tables (see UL 508A 28.3.2: "Ampacity shall have
125 % of the full load current")
• Install the prescribed maximum fuse on each cable
• Parallel supply cable (2 x 3 phases + 2 PE - configuration (2)):
• Add 25 % to the total current from the tables and divide by 2
• Multiply the ampacity of the cables with 0.8 (see UL 508A table 28.1 continued)
• Install fuses of half the size of the recommended maximum fuse size on each cable.
• When using 2 x 3 phase + 2 PE as in (3):
• Add 25 % to the total current from the tables and divide by √3
• Multiply the ampacity of the cables with 0.8 (see UL 508A table 28.1 continued)
• Fuse size: the recommended maximum fuse size divided by √3 on each cable.
• Size PE cable:
• For supply cables up to AWG8: same size as the supply cables
• For supply cables larger than AWG8: use maximum allowed ampacity of the selected
supply cables and compare with value in table below (see CEC Part 1 table 17)

< 100 A: use AWG8

< 200 A: use AWG6
< 300 A: use AWG4

Always check the voltage drop over the cable (less than 5 % of the nominal voltage is
recommended).
Example of supply cable calculation: Itot = 128 A, maximum ambient temperature is 45 °C,
recommended fuse = 150 A
• Single supply cables (3 phases + 1 PE - configuration (1)):
• I = 128 A + 25 % = 128 x 1.25 = 160 A
• For AWG2/0, the maximum current is 175 A, which is sufficient => use AWG2/0
• Install the prescribed maximum fuse (150 A) on each cable
• Parallel supply cable (2 x 3 phases + 2 PE - configuration (2)):
• I = (128 A + 25%)/2 = (128 x 1.25)/2 = 80 A
• For a AWG4, the maximum current is 85 A x 0.8 = 68 A, which is insufficient. For an
AWG3, the maximum current is 100 x 0.8 = 80 A. So 2 parallel cables of 3 x AWG3 + 2 x
AWG8 are sufficient.
• Install 80 A fuses on each cable.

2920 7196 21 103

 Instruction book

9.3 Protection settings

Setting motor overload relay (F21)

Frequency (Hz) Voltage (V) 37kW F21 45kW F21

(A) (A)
IEC
60 230 83.8 102.3
60 380 50.4 61.8
50 400 47.6 58.2
60 460 41.9 51.1
UL/cUL
60 230 84 102
60 460 42 51
60 575 33 41

Settings for fan motor overload protection (Q15)

Frequency (Hz) Voltage (V) 37kW 45kW

Q15/F15 (A) Q15/F15 (A)
IEC
60 230 4.2 5.8
60 380 2.4 3.5
50 400 2.7 3.3
60 460 2.4 3.2
UL/cUL
60 230 4.2 5.8
60 460 2.4 3.2
60 575 1.9 2.6

9.4 Dryer switches

General
The regulating and safety devices are factory-adjusted to give optimum performance of the dryer.
Do not alter the setting of any of the devices.

9.5 Reference conditions and limitations

Reference conditions

Air inlet pressure (absolute) bar 1

Air inlet pressure (absolute) psi 14.5
Air inlet temperature ˚C 20
Air inlet temperature ˚F 68
Relative humidity % 0

104 2920 7196 21

Instruction book

Working pressure See section Compressor data.

On water-cooled units also:

Cooling water inlet temperature ˚C 20
Cooling water inlet temperature ˚F 68

Limits

Maximum working pressure See section Compressor data.

Minimum working pressure bar(e) 4
Minimum working pressure psig 58
Maximum air inlet temperature ˚C 46
Maximum air inlet temperature ˚F 115
Minimum ambient temperature ˚C 0
Minimum ambient temperature ˚F 32

On water-cooled units also:

Maximum cooling water outlet temperature ˚C 50
Maximum cooling water outlet temperature ˚F 122
Maximum cooling water inlet pressure bar(e) 5
Maximum cooling water inlet pressure psig 72.5

9.6 Compressor data

Reference conditions

All data specified below apply under reference conditions, see section Reference
conditions and limitations.

GA 37+

7.5 8.5 100 125 150 175

10 bar 13 bar
bar bar psi psi psi psi
Frequency Hz 50 50 50 50 60 60 60 60
Reference working
bar(e) 7 8 9.5 12.5 6.9 8.6 10.3 12
pressure
Reference working
psig 102 116 138 181 100 125 150 175
pressure
Set point of
˚C 40 40 40 60 40 40 40 60
thermostatic valve
Set point of
˚F 104 104 104 140 104 104 104 140
thermostatic valve
Motor shaft speed r/min 2956 2956 2956 2956 3565 3565 3565 3565
Nominal motor power kW 37 37 37 37 37 37 37 37
Nominal motor power hp 49.6 49.6 49.6 49.6 49.6 49.6 49.6 49.6

2920 7196 21 105

 Instruction book

7.5 8.5 100 125 150 175

10 bar 13 bar
bar bar psi psi psi psi
Oil capacity l 17.7 17.7 17.7 17.7 17.7 17.7 17.7 17.7
Oil capacity US gal 4.12 4.12 4.12 4.12 4.12 4.12 4.12 4.12
Sound pressure level
(according to ISO dB(A) 67 67 67 67 67 67 67 67
2151:2004)

GA 45+

7.5 8.5 100 125 150 175

10 bar 13 bar
bar bar psi psi psi psi
Frequency Hz 50 50 50 50 60 60 60 60
Reference working
bar(e) 7 8 9.5 12.5 6.9 8.6 10.3 12
pressure
Reference working
psig 102 116 138 181 100 125 150 175
pressure
Set point of
˚C 40 40 40 60 40 40 40 60
thermostatic valve
Set point of
˚F 104 104 104 140 104 104 104 140
thermostatic valve
Motor shaft speed r/min 2956 2956 2956 2956 3565 3565 3565 3565
Nominal motor power kW 45 45 45 45 45 45 45 45
Nominal motor power hp 60.4 60.4 60.4 60.4 60.4 60.4 60.4 60.4
Oil capacity l 19 19 19 19 19 19 19 19
Oil capacity US gal 4.39 4.39 4.39 4.39 4.39 4.39 4.39 4.39
Sound pressure level
(according to ISO dB(A) 70 70 70 70 70 70 70 70
2151:2004)

9.7 Technical data controller

General

24 V AC /16 VA 50/60Hz (+40%/-30%)

Supply voltage
24 V DC/0.7 A
IP54 (front)
Type of protection
IP21 (back)
• Operating temperature
range • -10°C…..+60°C (14 °F .....140 °F)
• Storage temperature • -30°C…..+70°C (-22 °F ......158 °F)
range
Relative humidity 90%
Permissible humidity
No condensation
Mounting Cabinet door

106 2920 7196 21

Instruction book

Digital outputs

Number of outputs 9
Type Relay (voltage free contacts)
Rated voltage AC 250 V AC / 10 A max.
Rated voltage DC 30 V DC / 10 A max.

Digital inputs

Number of inputs 10
Supply by controller 24 V DC
Supply protection Short circuit protected to ground
Input protection Not isolated

Analog inputs

Number of pressure inputs 2

Number of temperature
5
inputs

2920 7196 21 107

 Instruction book

10 Instructions for use

Oil separator vessel

This vessel can contain pressurized air. This can be potentially dangerous if the equipment is
misused.
This vessel must only be used as a compressed air/oil separator tank and must be operated within
the limits specified on the data plate.
No alterations must be made to this vessel by welding, drilling or other mechanical methods
without the written permission of the manufacturer.
The pressure and temperature of this vessel must be clearly indicated.
The safety valve must correspond with pressure surges of 1.1 times the maximum allowable
operating pressure. It should guarantee that the pressure will not permanently exceed the
maximum allowable operating pressure of the vessel.
Use only oil as specified by the manufacturer.
Original bolts have to be used after opening for inspection. The maximum torque has to be taken
into consideration: for M12 bolts 73 Nm (53.8 lbf.ft)), for M16 bolts 185 Nm (136.4 lbf.ft).

108 2920 7196 21

Instruction book

11 Guidelines for inspection

Guidelines
On the Declaration of Conformity / Declaration by the Manufacturer, the harmonised and/or other
standards that have been used for the design are shown and/or referred to.
The Declaration of Conformity / Declaration by the Manufacturer is part of the documentation that is
supplied with this compressor.
Local legal requirements and/or use outside the limits and/or conditions as specified by the
manufacturer may require other inspection periods as mentioned below.

2920 7196 21 109

 Instruction book

12 Pressure equipment directives

Components subject to 2014/68/EU Pressure Equipment Directive
The following table contains the necessary information for the inspection of all pressure equipment
of category II and higher according to the Pressure Equipment Directive 2014/68/EU and all
pressure equipment according to the Simple Pressure Vessel Directive 2014/29/EU.

Minimum and
Compressor Design maximum PED
Component Description Volume
type pressure design Class
temperature
GA 37+, GA 45+ 1625 430224 Vessel 30l 15 bar(e) -10 ˚C/ 120 ˚C II
0830 101068 Safety valve - - - IV
0830 101069 Safety valve - - - IV

Number Minimum Inspection

Compressor type Component Description of cycles wall frequency
(1) thickness (2)
GA 37+, GA 45+ 1625 5641 99 Vessel 2 x 106 8 mm 10 years
0830 1010 68 Safety valve - - -
0830 1010 69 Safety valve - - -

The compressors conform to PED smaller than category II.

(1) The number of cycles refers to the number of cycles from 0 bar(e) to maximum pressure.
(2) The minimum wall thickness must be respected at all times. Inspection techniques such as
ultrasonic or X-ray are equivalent to hydrostatic testing for this equipment.

110 2920 7196 21

Instruction book

13 Declaration of conformity

Figure 32: Typical example of a Declaration of Conformity document

(1): Contact address:

Atlas Copco Airpower n.v.
P.O. Box 100
B-2610 Wilrijk (Antwerp)
Belgium
(2): Applicable directives
(3): Standards used
On the Declaration of Conformity / Declaration by the Manufacturer, the harmonized and/or other
standards that have been used for the design are shown and/or referred to.
The Declaration of Conformity / Declaration by the Manufacturer is part of the documentation that is
supplied with this device.

2920 7196 21 111

atlascopco.com
2920 7196 21 - EN © Printed in Atlas Copco Airpower N.V.. All rights reserved. Designs and specifications are
subject to change without notice or obligation… March 2023