Bosch ACS 151 User manual

ACS 151
en Original instructions
A/C service unit

F 002 DG9 448 2018-02-01|Bosch Limited
| ACS 151 | 3 en
Contents English
1. Symbols used 4
1.1 In the documentation 4
1.1.1 Warning notices - Structure and
meaning 4
1.1.2 Symbols in this documentation 4
1.2 On the product 4
2. User information 5
2.1 User group 5
2.2 Agreement 5
2.3 Obligation of contractor 5
2.4 Safety Instructions 5
2.5 Safety devices 6
3. Product description 7
3.1 Application 7
3.2 Delivery specification 7
3.3 Description of unit 7
3.3.1 Human Machine Interface (HMI) 8
3.3.2 Oil bottles 8
3.3.3 Quick couplers 9
3.3.4 Valves for charging oil 9
3.3.5 Valves for refrigerant recovery /
recharge / tank fill 9
3.3.6 Brakes 9
3.3.7 Power cable and master switch 9
3.4 Description of function 9
4. Commissioning 10
4.1 Removing the transport packaging 10
4.2 Before turning on for the first time 10
4.3 Powering on the ACS 151 11
4.4 Filling the internal refrigerant
tank 11
5. Troubleshooting 13
6. Program description 14
6.1 Preparations for A/C service 14
6.2 Performing vehicle A/C service 14
6.2.1 Recovery phase 14
6.2.2 Vacuuming phase 14
6.2.3 Recharge phase 15
6.3 Additional services 15
6.3.1 Refrigerant top up 15
6.3.2 Hose drain 15
7. Maintenance 16
7.1 Spare and wearing parts 16
7.2 Refilling the refrigerant tank 16
7.3 Vacuum pump oil change 16
7.4 Replacing the filter drier 17
7.5 Replacing the inline filters 18
7.6 Purging non-condensable gases 18
8. Decommissioning 18
8.1 Disposal of electronic items 18
8.2 Disposal of LCD, refrigerants, lubricants
and oils 18
8.3 Disposal of filter drier 18
9. Technical data 18

F 002 DG9 448 2018-02-01| Bosch Limited
4 | ACS 151 | Symbols useden
1. Symbols used
1.1 In the documentation
1.1.1 Warning notices - Structure and meaning
Warning notices warn of dangers to the user or people
in the vicinity. Warning notices also indicate the con-
sequences of the hazard as well as preventive action.
Warning notices have the following structure:
Warning
symbol
KEY WORD – Nature and source of hazard!
Consequences of hazard in the event of fail-
ure to observe action and information given.
¶Hazard prevention action and information.
The key word indicates the likelihood of occurrence and
the severity of the hazard in the event of non-obser-
vance:
Key word Probability of
occurrence
Severity of danger if in-
structions not observed
DANGER Immediate impending
danger
Death or severe injury
WARNING Possible impending
danger
Death or severe injury
CAUTION Possible dangerous
situation
Minor injury
1.1.2 Symbols in this documentation
Symbol Designation Explanation
!Attention Warns about possible property dam-
age.
iInformation Practical hints and other useful in-
formation.
1.
2.
Multi-step
operation
Instruction consisting of several
steps.
eOne-step oper-
ation
Instruction consisting of one step.
 Intermediate re-
sult
An instruction produces a visible in-
termediate result.
"Final result There is a visible final result on com-
pletion of the instruction.
1.2 On the product
!Observe all warning notices on products and ensure
they remain legible.
Caution!
Contact with the refrigerant can cause
blindness and severe injuries.
¶Read this operating manual and all
technical documentation for the used
components.
¶Wear protective gloves.
¶Wear protective goggles.

F 002 DG9 448 2018-02-01|Bosch Limited
User information | ACS 151 | 5 en
2. User information
2.1 User group
The product may be used by skilled and instructed
personnel only. Personnel scheduled to be trained, fa-
miliarized, instructed or to take part in a general train-
ing course may only work with the product under the
supervision of an experienced person.
All work conducted on pressurized equipment may be
performed by persons with sufficient knowledge and
experience in using pressurized devices and, also be
aware of the risks involved in the use of pressurized
devices.
2.2 Agreement
Your use of the product means that you accept the fol-
lowing conditions:
Copyright
Software and data are the property of Bosch Limited,
hereafter denoted as Bosch, or its suppliers and are
protected against unauthorized reproduction under
copyright laws, international contracts and other na-
tional legal provisions. Copying and selling of data
and software or any other part thereof is prohibited
and punishable by law. In the event of violations,
Bosch Limited reserves the right to proceed with crimi-
nal prosecution and to claim for damages.
Liability
All data in this program is based - where possible - on
manufacturer and importer details. Bosch does not ac-
cept liability for the correctness and completeness of
software and data; liability for damage caused by faulty
software and data is ruled out. Whatever the event,
Bosch liability is restricted to the amount for which the
customer actually pays for this product. This disclaimer
of liability does not apply to damages caused by intent
or gross negligence on the part of Bosch.
Warranty
Any use of non-approved hardware and software will
result in a modification to our product and thus to
exclusion of any liability and warranty, even if the hard-
ware or software has in the meantime been removed or
deleted. No changes may be made to our products. Our
products may only be used in combination with original
accessories and original service parts. Failing to do so,
will render null and void all warranty claims.
2.3 Obligation of contractor
The contractor is obliged to ensure that all measures
geared towards the prevention of accidents, industrial
diseases, labor-related health risks are taken and mea-
sures towards making the workplace fit for people to
work in are carried out.
The contractor is bound to ensure that all electrical
equipment and operating material is set up, modified
and maintained by skilled electricians only or under the
guidance and supervision of a skilled electrician in ac-
cordance with electrical engineering principles.
Furthermore, the contractor must ensure that all elec-
trical equipment and operating material is operated in
keeping with electrical engineering principles.
If a piece of electrical equipment or operating material
is found to be defective, i.e. it does not or no longer
complies with electrical engineering principles, the con-
tractor must ensure that the fault is rectified immedi-
ately and, in the event that imminent danger exists, also
ensure that the electrical equipment or the electrical
operating material is not used.
2.4 Safety Instructions
All safety instructions are to be read thoroughly before
using the Bosch product and they must be observed.
RAvoid the refrigerant coming into contact with the
skin. The low boiling point of the refrigerant (approx-
imately -30 °C at atmospheric pressure) can cause
frostbite. In case of contact with the skin, remove
wet clothing immediately and rinse the affected area
of skin with plenty of water.
Do not breathe in refrigerant or oil vapors.
The vapors can irritate the eyes and the
breathing passage of the nose. If liquid
refrigerant/oil gets into the eyes, rinse the
eyes thoroughly with water for 15 minutes.
Then, seek medical attention, even if the
eyes do not hurt.
RBefore the ACS 151 is connected to the vehicle A/C
system or to an external refrigerant tank, ensure that
the quick couplers do not leak. Use only external re-
frigerant tanks that are fitted with safety valves and
approved in accordance with applicable standards.
RBefore turning off the ACS 151, ensure that all the
service phases are complete. This prevents refriger-
ant from escaping into the environment.
Do not use compressed air with R134a.
Some mixtures of air and R134a are highly
flammable at high pressure. These mixtures
are potentially hazardous and can cause
fires or explosions resulting in damage to
property and injury to people.

F 002 DG9 448 2018-02-01| Bosch Limited
6 | ACS 151 | User informationen
RRefrigerant extracted from the vehicle A/C system
might be contaminated with moisture, lubricant, dirt
and traces of other gases.
RThe ACS 151 does not have any refrigerant identifier
system. If refrigerants other than R134a are used, it
might lead to contamination.
RR134a is colorless, odorless and heavier than air. It
expels oxygen and can flow into repair pits. If the
refrigerant escapes, there is a risk of suffocation in
poorly ventilated rooms or repair pits.
RR134a may not be used in environments with a risk
of explosion. Fire, naked flames and smoking are
prohibited. No welding or soldering is allowed. High
temperatures and UV radiation can cause R134a to
chemically separate. The resulting products cause
coughs and nausea.
RR134a may not be mixed with other refrigerants.
Mixing refrigerants can cause damage to the vehicle
A/C system.
RThe ACS 151 must always be monitored during op-
eration. Do not leave the ACS 151 unattended when
it is switched on.
RVehicle A/C service, using the ACS 151, must be pre-
pared and carried out in such a way that the vehicle
A/C circuit is not opened (for example, radiator or
engine removal).
RThe ACS 151 should be positioned with all four
wheels on a flat, vibration-free surface to ensure cor-
rect operation of the load sensors. The ACS 151 can
be prevented from rolling away by applying brakes.
RThe ACS 151 must always be transported in a verti-
cal position. Do not invert the ACS 151.
RThere are no additional safety provisions for protect-
ing the ACS 151 unit against damage in the event of
natural calamities like earthquakes, fires, floods etc.
RExcept for maintenance work, do not remove any
pressurized equipment inside the ACS 151 unit. Ad-
here to the national laws or regulations for ensuring
safety of pressurized equipment.
RWe recommend that calibration of refrigerant load
sensor be done at least once every year. Contact Bosch
customer service for calibration of load sensors.
RThe ACS 151 must be regularly inspected by service
personnel or the approved authorities to ensure
safety of the unit.
Warning - Risk of frostbite in the event of
refrigerant leakage!
If refrigerant escapes, there is a risk of frost-
bite to the hands and body.
¶Wear protective goggles.
¶Wear protective gloves.
¶Ensure that the HP and LP hoses are not
damaged.
¶Ensure that the quick couplers are tightly
fixed to the hoses.
Warning - Risk of frostbite during removal
of service hoses!
If refrigerant escapes, there is a risk of
frostbite to the hands and body.
¶Carefully disconnect service hoses as all
hoses can contain pressurized
refrigerant.
RConnect the power cable only to a properly ground-
ed electrical outlet.
RDo not shut off the valves on the R134a tank when
the ACS 151 is in operation.
RFor the purpose of safety, it is recommended to use
an Earth Leakage Circuit Breaker (ELCB) with the
following specifications:
Parameter Specification
Rated voltage 230 VAC +/- 10%
Rated frequency 50 Hz
Rated current 8 A
Rated trip current 30 mA
Tripping curve C
2.5 Safety devices
RPressure switch - Switches the compressor off if the
normal operating pressure is exceeded.
RSafety valve: Operates when the design pressure is
exceeded.
RFuse: Interrupts excessive current flow into the
ACS 151.

F 002 DG9 448 2018-02-01|Bosch Limited
Product description | ACS 151 | 7 en
3. Product description
3.1 Application
The ACS 151 is used to perform the following basic ser-
vices for passenger car A/C systems:
RRefrigerant recovery
ROil recharge
RVacuuming and leak test
RRefrigerant recharge
The ACS 151 should be used with vehicle A/C systems
that use only R134a.
3.2 Delivery specification
Description
ACS 151
Hose - HP
Hose - LP
Quick coupler - HP
Quick coupler - LP
Can assembly - Used oil
Can assembly - Fresh oil
Operating instructions
Adapter for filling internal refrigerant tank
Power cable
3.3 Description of unit
1 2
3
4
5
6
7
8
9
10
11
12
13
14
15
459897_235Nkv
Fig. 1: ACS 151 left view
1 HP gauge
2 Stop indication LED (Red)
3 Display
4 Keypad
5 Master switch
6 In process LED (Green)
7 LP gauge
8 Manual valves (HP and LP)
9 Connectors for HP and LP hoses
10 Front wheels
11 Used oil bottle
12 Rear wheel (x 2)
13 Louvre for air circulation
14 Fresh oil bottle
15 Grip for LH panel

F 002 DG9 448 2018-02-01| Bosch Limited
8 | ACS 151 | Product descriptionen
1
2
3
4
459897_236Nkv
Fig. 2: ACS 151 right view
1 Handle
2 Power inlet
3 Grip for RH panel
4 Hose holder
3.3.1 Human Machine Interface (HMI)
The HMI consists of:
RPressure gauges: The pressure during the service is
displayed on the gauges.
RLCD: The menu options and status of service are
displayed on the LCD.
RStatus indication LEDs
LED Status Service status Action by user
Stop
indication
(Red)
Glowing Error
Follow the instruc-
tions displayed on the
screen.
or
Refer chapter 5 for
more information
about error codes.
In process
(Green)
Glowing Completion
Perform actions after
completion as indicat-
ed in chapter 6.
Blinking In progress None
RKeypad: The selection of service menu options and
service parameters can be done via the keypad.
Keys Description
REC Recover refrigerant from vehicle A/C system
VAC Perform vacuuming of vehicle A/C system
CHR Recharge refrigerant to vehicle A/C system
zRIn edit mode
- press once to act as backspace.
- press twice to navigate to previous screen.
RIf not in edit mode, press once to navigate to
previous screen.
Enter Enter
Abort Abort the service in progress
RMaster switch: Power on/ off the ACS 151.
RSerial Port: It is used to update firmware, contact
Bosch customer service for firmware update.
3.3.2 Oil bottles
!Do not apply excessive force while detaching or at-
taching the oil bottles.
448_3
1
2
3
Fig. 3: Detaching the fresh oil bottle
1 Manual oil recharge valve
2 Connector
3 Oil level scale
To detach the fresh oil bottle, pull the connector
(Fig. 3, Pos. 2) slightly downwards and pull down the
bottle.

F 002 DG9 448 2018-02-01|Bosch Limited
Product description | ACS 151 | 9 en
459897_238Nkv
1
Fig. 4: Detaching the used oil bottle
1 Connector
To detach the used oil bottle, pull the connector
(Fig. 4, Pos. 1) slightly upwards and pull down the
bottle.
Observe the symbols on the front panel to identify the
bottles. The following table lists the symbols and their
description.
Symbol Description
Fresh oil bottle
Used oil bottle
3.3.3 Quick couplers
The quick couplers (see fig. 7) are connected to the
service connections on the vehicle A/C system to per-
form the service. To detach the quick couplers from
the service connection on the car A/C system, grip the
knurled portion of the coupler. Depress the coupler
slightly and pull back the knurled portion gently to re-
lease the coupler.
To attach the coupler to the service connection on the
on the car A/C system, place the coupler on the service
connection and pull back the knurled portion of the
coupler. Press gently.
3.3.4 Valves for charging oil
Fresh oil injection can be performed by turning the
valve above the oil bottle. Refer the following table for
more information.
Operation Action Trigger
Inject fresh oil Turn valve anticlock-
wise
Software prompt
Stop fresh oil
injection
Turn valve clockwise After required quan-
tity of fresh oil is
filled.
3.3.5 Valves for refrigerant recovery / recharge /
tank fill
Refrigerant recovery / recharge can be performed by
turning the valves above the respective hoses (HP / LP).
Refer the following table for more information.
Operation Action Trigger
Fill refrigerant /
recover
refrigerant
Turn red / blue knobs
anticlockwise
Software prompt
Stop filling /
recovering
refrigerant
Turn red / blue knobs
clockwise
Software prompt
3.3.6 Brakes
The ACS 151 can be prevented from rolling away by ap-
plying brakes on the front wheels.
3.3.7 Power cable and master switch
The power cable is connected to the inlet and then to
the mains supply. The ACS 151 can be powered on by
switching on the master switch.
3.4 Description of function
The functions performed by the ACS 151 are:
RRecovery and recycling - Refrigerant is recovered
from the car A/C system. It is then recycled to
remove suspended particles and moisture. The
cleaned refrigerant is stored in the refrigerant tank.
RVacuuming and leak detection - A deep vacuum is
created and car A/C system is checked for leaks.
RRecharging refrigerant - The refrigerant in the refrig-
erant tank is charged into the vehicle A/C system.
RReplenishing vehicle compressor oil along with re-
frigerant as specified by the vehicle manufacturer

F 002 DG9 448 2018-02-01| Bosch Limited
10 | ACS 151 | Commissioningen
4. Commissioning
iAll the operations described in chapter 4 must be
performed prior to initial vehicle A/C system
servicing.
4.1 Removing the transport packaging
1. Remove the transport packaging.
2. Remove the components placed beneath the
ACS 151.
3. Move the ACS 151 out of the packaging palette.
!Do not disconnect electrical connections or tamper
with the internal components. If there is any damage
or oil spillage, contact customer service.
1
459897_237Nkv
23
Fig. 5: Opening the right panel
1 Red and blue knobs
2 Refrigerant tank
3 Left panel
4. Open the left panel (Fig. 5, Pos. 3).
5. Ensure that the red and blue knobs on the refriger-
ant tank are open.
4.2 Before turning on for the first time
1. Remove the hoses, HP and LP couplers from the
packaging box.
iThe oil level should be above the level indicator
(Fig. 6, Pos. 4).
2. Observe the oil level in the vacuum pump sight glass
(Fig. 6, Pos. 2).
1
2
459897_229Nkv
34
Fig. 6: Filling vacuum pump oil
1 Screw cap
2 Sight glass
3 Drain plug
4 Level indicator
3. If the oil quantity is inadequate, open the screw cap
of the vacuum pump (Fig. 6, Pos. 1).
4. Top up the oil till it reaches above the level indicator.
iEnsure that you use VPO-46 High vacuum pump oil.
The maximum quantity of oil that can be filled is
400 ml.
5. Close the screw cap of the vacuum pump.
6. Close the left panel.
7. Fix the oil bottles to the connectors.
8. Connect the end connectors of the service hoses to
the hose connections. Observe the red / blue identi-
fication stickers on the front panel before connecting
the hoses. Tighten the hose connection.
!Tighten the service hose end connectors by hand. Do
not use any tools.

F 002 DG9 448 2018-02-01|Bosch Limited
Commissioning | ACS 151 | 11 en
iThe HP hose (red hose) should be connected to the
hose connection with the red identification sticker.
The LP hose (blue hose) should be connected to the
hose connection with the blue identification sticker.
Do not interchange the HP and LP hose connections.
459897_124Nkv
2
1
Fig. 7: Fixing the couplers to the hoses
1 Coupler
2 O-ring
9. Insert the coupler unto the other end of the hoses
and tighten. Ensure that the O-rings used for con-
necting the couplers to the hoses are properly
placed before tightening the coupler.
4.3 Powering on the ACS 151
1. Move the ACS 151 to a flat, vibration-free surface.
2. Apply the brake to prevent the unit from rolling away.
3. Connect the power cable to the power inlet of the
ACS 151.
4. Connect the power cable to the mains supply.
iRefer chapter 9 for the specifications of power supply.
5. Switch on the master switch.
"The software version is displayed. After a couple of
seconds, the main menu is displayed.
There are two options available in the main menu:
RA/C Services
RMisc. Services
4.4 Filling the internal refrigerant
tank
Before the ACS 151 can be used, the internal refriger-
ant tank must be filled with R134a.
R134a can be procured from the local gas supplier. It is
normally stored and transported in tanks with connec-
tion fittings.
If cylinders without dip tube are used, the liquid ports
of the external cylinders should be connected to the
internal refrigerant cylinder. The cylinder should be
placed in an inverted position during the filling process.
If external cylinders with dip tube are used, the cylin-
ders can be placed in an upright position.
1. Apply the brakes on the front wheel.
2. Connect the adapter to the connection on the
external refrigerant tank.
3. Connect the HP quick coupler of the ACS 151 to the
connecting adapter on the external refrigerant tank.
From the main menu, press the keys in the same order
as indicated in the following table:
Step Press
key...
To... Remarks
11Select A/C SERVICES --
22Select ADDITIONAL --
32Select T-FILL The message
CONNECT HP
TO EXT CYL-
INDER is dis-
played. Execute
the instruction.
4Enter Open HP valve and close
OI valve.
The message
OPEN VALVE
OF EXT CYL-
INDER is dis-
played. Execute
the instruction.
5Enter Open valve of external re-
frigerant tank
The message
OPEN HP
VALVE is dis-
played. Execute
the instruction.
6Enter Close the oil valve --

F 002 DG9 448 2018-02-01| Bosch Limited
12 | ACS 151 | Commissioningen
Step Press
key...
To... Remarks
7Enter Enter the quantity of re-
frigerant to be filled.
RThe message
FILL QTY:
is displayed. En-
ter the quantity
of refrigerant to
be filled.
RTo ensure reli-
able operation,
it is recom-
mended to use
the optimum re-
frigerant quan-
tity. The opti-
mum refrigerant
quantity for the
ACS 151 is 4 kg
- 7 kg. If the
quantity is too
less, you may
not be able to
recharge the re-
frigerant during
service. If the
quantity is too
high, you may
not be able to
recover the re-
frigerant during
service.
8Enter Fill R134a to the internal
cylinder
--
4. Follow the instructions on the screen.
"You have successfully filled R134a to the internal re-
frigerant tank.
iFollow the same procedure every time you need to
fill R134a to the refrigerant tank.
iTo view the quantity of refrigerant, press the Enter
key from the main menu. The quantity of R134a in
the internal refrigerant tank is displayed. To return to
the main menu, press the Enter key again.

F 002 DG9 448 2018-02-01|Bosch Limited
Troubleshooting | ACS 151 | 13 en
5. Troubleshooting
Error code Messages Actions
1001 SERVICE TIMEOUT Check for blockage in the vehicle A/C system.
1004 INT TANK FULL RWeight limit reached. Reduce quantity of refrigerant in refrigerant tank.
RLoad cell is defective. Contact customer service.
100A LOW PRESSURE AC REnsure HP and LP manual valves are open during service.
REnsure quick couplers are connected properly to the service ports on the vehi-
cle A/C system.
RIf the couplers are connected properly, try to perform A/C service. If the error
persists, contact customer service.
2001 HIGH PRESSURE The pressure is greater than 1400 mbar while vacuuming:
RContinue the recovery.
2002 LEAK DETECTED Repair the vehicle A/C system.
5001 SERVICE TIMEOUT RCheck if HP or LP manual valve is open.
RCheck for blockage in the ACS 151.
RCheck if quick couplers are open.
5002 LESS QTY IN TANK Fill the internal refrigerant tank.
5006 HIGH PR RECV Perform recovery.
5007 HIGH PR VAC Perform vacuuming.
A101 SERVICE TIMEOUT Check for blockage in the ACS 151.
A103 INT TANK FULL RWeight limit reached. Reduce quantity of refrigerant in refrigerant tank.
RLoad cell is defective. Contact customer service.
A105 CHECK EXT VALVE RCheck if the valve on the external tank is open.
RCheck if R134a is available in the external tank.
A501 INT TANK FULL RWeight limit reached. Reduce quantity of refrigerant in refrigerant tank.
RLoad cell is defective. Contact customer service.
A502 SERVICE TIMEOUT Check for blockage in the ACS 151.
A601 SERVICE TIMEOUT RCheck if the vehicle A/C system is on.
RCheck for blockage in the ACS 151.
RCheck the refrigerant tank scale.
RCheck for blockage in the hoses
A602 LOW REF QTY RCheck if the vehicle A/C system is on.
RCheck for blockage in the ACS 151.
Warning code Message Actions
A107 FILL INCOMPLETE REnsure that the HP manual valve is open.
RCheck for blockages in the ACS 151.
RContact customer service
7100 SS SHUT DOWN RAllow the unit to cool for 30 minutes and switch on the ACS 151. Try recovery/ hose
drain.
RCheck if the blue knob on the refrigerant tank is closed. Open the blue knob If it is
closed.
RContact customer service if the problem persists.
iThe message Service Timeout indicates the service timeout for any service phase which is in progress. The
following table indicates the service timeout duration for different service phases.
Service phase Timeout duration (mins)
Tank fill 120
Refrigerant recovery 120
Recharge refrigerant 15
Hose drain 5
Top up 7

F 002 DG9 448 2018-02-01| Bosch Limited
14 | ACS 151 | Program descriptionen
6. Program description
6.1 Preparations for A/C service
!The ACS 151 should not be used for servicing a vehi-
cle A/C system that has been repaired with a chemi-
cal sealant. The sealant could damage the ACS 151
and the vehicle A/C system. Non-compliance invali-
dates the warranty.
!Do not attempt to shut off the valves on the R134a
tank when the ACS 151 is in operation.
Before servicing the vehicle A/C system, execute the
following preparatory procedure:
1. Move the ACS 151 to a flat vibration-free surface
close to the vehicle.
2. Apply the brakes to prevent the ACS 151 from rolling
away.
Caution!
Hot engine parts can cause severe burns to
the hands.
¶Allow the engine to cool down before
work.
3. Connect the power cable to the mains supply.
4. Turn on the master switch.
6.2 Performing vehicle A/C service
The default values of the parameters in each stage are
listed in the following table:
Service phase Parameter Default value
Recovery Pressure increase time 2 min
Vacuum Vacuum time 20 min
Vacuum hold time 5 min
Tab. 1: Default values of parameters
6.2.1 Recovery phase
To execute the recovery phase, press the REC button
on the keypad and skip to step 3 in the following pro-
cedure. Else, start from the main menu and execute all
the steps in the following procedure.
Step Press
key...
To... Remarks
11Select A/C SER-
VICES
--
21Select BASIC --
31Select REC The message CHECK
OIL BOTTLE
AVAILABILITY is
displayed. Check if the
oil bottle is fixed.
4Enter Execute the instruc-
tion on the screen.
The message OPEN HP
& LP VALVESis dis-
played.
5Enter Execute the instruc-
tion on the screen.
The message ENSURE
OIL VALVE IS
CLOSED is displayed.
6Enter Start recovery Quantity of the refriger-
ant is displayed.
"You have successfully completed the recovery phase.
Press Enter to return to the main menu.
6.2.2 Vacuuming phase
iEnsure that you perform recovery before vacuuming.
To execute the vacuuming phase, press the VAC button
on the keypad and skip to step 3 in the following proce-
dure.
iUpon pressing the VAC button, the fields VAC CREA
(vacuum creation time) and VAC HOLD (vacuum
hold time) are displayed. Set the values and proceed
to step 3 in the following procedure.
Else, start from the main menu and execute all the
steps in the following procedure.
Step Press
key...
To... Remarks
11Select A/C SERVICES --
21Select BASIC --
32Select VAC.
Set values for VAC CREA
& VAC HOLD
The fields VAC
CREA (vacuum
creation time) and
VAC HOLD (vac-
uum hold time) are
displayed.
4Enter Execute the instruction
on the screen.
--
5Enter Execute the instruction
on the screen.
--
6Enter Vacuuming starts. Once
the vacuuming is com-
plete, the vacuum hold
starts. Then execute the
instruction on the screen.
Observe the vacu-
um pressure on the
screen.
"You have successfully completed the vacuuming phase.

F 002 DG9 448 2018-02-01|Bosch Limited
Program description | ACS 151 | 15 en
6.2.3 Recharge phase
!Use only new oil to replace the amount removed dur-
ing the recovery process. Used oil should be discard-
ed as per applicable regulations.
iThe quantity of oil added to the vehicle A/C system
corresponds to the quantity drawn during the recov-
ery phase. When filling a vehicle A/C system for the
first time, refer to the vehicle documentation or the
vehicle-specific repair manual for the specified oil
recharge quantity.
iUse oil grade specified by the vehicle manufacturer.
Use only new oil to replace the oil removed during
the recovery process. Used oil should be discarded
as per local regulations.
To execute the recharge phase, press the CHR button
on the keypad and skip to step 3 in the following pro-
cedure. Else, start from the main menu and execute all
the steps in the following procedure:
Step Press
key...
To... Remarks
11Select A/C SERVICES --
21Select BASIC --
33The field CHRG QTY is
displayed. Enter the re-
charge quantity.
The field CHRG
QTY is displayed.
The valid range for
charge quantity is
100 - 999 g.
4Enter Execute the instruction
on the screen.
--
5Enter Execute the instruction
on the screen
--
6Enter Execute the instruction
on the screen.
--
6Enter Execute the instruction
on the screen.
--
7Enter Start charging refrigerant RIf charging
stalls, the mes-
sage Charge
failed con-
tinue is dis-
played. Press En-
ter and follow
the instructions
on the screen to
complete vehi-
cle assisted re-
charge.
RIf the charging
is complete per-
form step 8.
8Enter Execute the instruction
on the screen.
Once the hose
drain is complete,
the recharge quan-
tity of refrigerant is
displayed.
"You have successfully completed the recharge phase.
6.3 Additional services
6.3.1 Refrigerant top up
If there is a decrease in the quantity of refrigerant in
the vehicle A/C system, an additional quantity can be
added.
Before doing a top up, the quantity of refrigerant al-
ready present in the car A/C system is not known. In
such a scenario, topping up might result in overcharg-
ing of the refrigerant. Top up should be performed only
after ascertaining the quantity of refrigerant already
present in the car A/C system. Else, a complete A/C
service should be performed.
Step Press
key...
To... Remarks
11Select A/C SERVICES --
22Select ADDITIONAL --
31Select TOPUP. Enter the
top-up quantity.
--
4Enter Execute the instruction
on the screen.
--
5Enter Execute the instruction
on the screen.
--
6Enter Execute the instruction
on the screen.
--
7Enter Execute the instruction
on the screen.
--
8Enter Top up stats. Execute the
instruction on the screen.
--
9Enter Hose drain starts. Exe-
cute the instruction on
the screen.
--
6.3.2 Hose drain
After every recharge / top up / tank fill, some quantity
of refrigerant is left in the hydraulic circuit. It is neces-
sary to drain the refrigerant from the hoses. Start from
the main menu and execute all the steps in the follow-
ing procedure.
Step Press
key...
To... Remarks
11Select A/C SERVICES --
22Select ADDITIONAL --
33Select HOSE DRAIN --
4Enter Execute the instruction
on the screen.
--
5Enter Execute the instruction
on the screen.
--
6Enter Execute the instruction
on the screen. Hose drain
starts
--
"You have successfully completed hose drain.

F 002 DG9 448 2018-02-01| Bosch Limited
16 | ACS 151 | Maintenanceen
1
2
459897_229Nkv
3
4
Fig. 8: Draining vacuum pump oil
1 Screw cap
2 Sight glass
3 Drain plug
6. Open the drain plug (Fig. 8, Pos. 3) and drain out
the vacuum pump oil.
7. Close the drain plug.
8. Open the screw cap of the vacuum pump
(Fig. 8, Pos. 1).
!Ensure that the oil does not spill over when you fill
fresh oil.
9. Fill fresh vacuum pump oil. Observe the level indica-
tor (Fig. 6, Pos. 4).
The oil level should cross the OIL LEVEL mark.
10. Close the screw cap.
11. Close the left panel.
12. Connect the power cable to the power socket.
13. Connect the power cable to the mains supply.
14. Start the ACS 151.
After the vacuum pump oil is changed, the counter has
to be reset. Execute the following procedure to reset
the counter.
Step Press
key...
To... Remarks
12Select Misc. SERVICES --
21Select MAINTENANCE The MAINTE-
NANCE menu is
displayed.
32Select VAC/FILTER LIFE
41Select VACUUM PUMP The time elapsed
since the last oil
change is dis-
played.
5Enter Reset the counter to 0 Contact Bosch
customer serive for
the password.
6Enter Follow the instructions
on the screen.
Check if the
counter is set to 0.
"You have successfully added oil to the vacuum pump
and reset the maintenance counter.
7. Maintenance
!Do not carry out any maintenance work that is not
specifically recommended in this chapter.
7.1 Spare and wearing parts
Description Order number
Filter drIer with set of inline filter
elements
F 002 DG1 4DA
Set of inline filter elements F 002 DG1 544
Vacuum pump oil F 002 DG6 401
iContact your local Bosch dealer for ordering spare
and wearing parts.
7.2 Refilling the refrigerant tank
See chapter 4.5 for the procedure to fill the internal
refrigerant tank.
7.3 Vacuum pump oil change
The vacuum pump oil needs to be changed after every
60 hours of operation. When it is time to change the
vacuum pump oil, the message Replace Vacuum
Pump Oil is displayed.
Warning - Risk of burns!
The hot surface of the vacuum pump can
cause severe burns to the hands.
¶Allow the vacuum pump to cool before
commencing maintenance work
1. Perform hose drain (refer chapter 6.3.2).
2. Switch off the master switch.
3. Disconnect the power cable from the mains supply.
4. Disconnect the power cable from the power inlet.
5. Open the left panel.
iUse a container to drain the vacuum pump oil.

F 002 DG9 448 2018-02-01|Bosch Limited
Maintenance | ACS 151 | 17 en
7.4 Replacing the filter drier
The filter drier removes the moisture and suspended
particulate matter from the refrigerant. It is recom-
mended to change the filter drier after the specified
duration of usage. Reusing saturated filter driers may
result in reduced recycling capability of the ACS 151.
Consequently, the purity level of the refrigerant to be
charged to the vehicle A/C system also reduces.
iThe filter drier needs to be replaced after every
60 kg of refrigerant is recovered. When it is time to
replace the filter drier, the message "Filter Drier
Replacement Due" is displayed before starting
vehicle A/C service.
As soon as the warning message is displayed, contact
customer service for ordering a new filter drier.
iWhen inserting the new filter drier, ensure that it is
installed in the correct position.
!Ensure that you do not disturb the hose connections
or the electrical connections while replacing the
filter drier.
1. Perform hose drain (see chapter 6.3.2).
2. Disconnect the power cable from the mains supply.
3. Disconnect the power cable from the power socket.
4. Disconnect the HP and LP hoses.
5. Open the left panel.
1
2
459897_230Nkv
Fig. 9: Replacing the filter drier
1 Fastening nuts
2 Filter drier
6. Cut the cable tie that binds the filter drier to the
bracket of the ACS 151.
7. Detach the filter drier.
iUse a suitable spanner to unfasten or fasten the
nuts.
8. Mount the new filter drier. Ensure that the O-rings
are present at the mating part of the filter.
9. Hold the adapters firmly and loosen the hose con-
nectors. Use tightening torque 9.5 N-m
10. Pull out the inline filters from the adapters.
iEnsure that the O-ring is in place and not damaged.
If damaged, change the O-ring.
11. Place new inline filters into the adapters.
12. Assemble the hose connectors to the adapters.
13. Close the left panel.
14. Connect the HP and LP hoses to their respective
connectors.
After the filter is replaced, the counter has to be reset.
Start from the main menu and execute all the steps in
the following procedure.
Step Press
key...
To... Remarks
12Select Misc. SERVICES --
21Select MAINTENANCE The MAINTE-
NANCE menu is
displayed.
32Select VAC/FILTER LIFE
42Select FILTER DRIER The time elapsed
since the last fil-
ter change is dis-
played.
5Enter Reset the counter to 0 Contact Bosch
customer serive for
the password.
6Enter Follow the instructions
on the screen.
Check if the
counter is set to 0.
"You have successfully changed the filter drier and reset
the maintenance counter.

F 002 DG9 448 2018-02-01| Bosch Limited
18 | ACS 151 | Maintenanceen
7.5 Replacing the inline filters
The inline filters have to be changed every time the fil-
ter drier is changed. The inline filters are housed in the
adapters (Fig. 10, Pos. 1).
123
4
459897_117Nkv
Fig. 10: Inline filter overview
1. Adapter
2. Filter insert
3. Adapter for hoses
4. O-ring
1. Perform hose drain (see chapter 6.3.2).
2. Switch off the master switch.
3. Disconnect the power cable from the mains supply.
4. Disconnect the hoses from the connectors.
5. Execute steps 9 to 12 from chapter 7.4.
6. Fasten the hose connectors back.
7. Connect the HP and LP hoses to the hose connec-
tors.
"You have successfully replaced the inline filters.
7.6 Purging non-condensable gases
1. Open the left panel.
2. Pull the ring mounted on the Y-valve of the refriger-
ant tank.
3. Release the ring once the NCGs are released.
4. Close the left panel.
8. Decommissioning
8.1 Disposal of electronic items
This product is subject to European guidelines
2002/96/EG (WEEE).
Old electrical and electronic devices, including
cables and accessories or batteries must be
disposed of separate to household waste.
¶Please use the return and collection systems
in place for disposal in your area.
¶Damage to the environment and hazards to
personal health can be prevented by prop-
erly disposing of old equipment.
8.2 Disposal of LCD, refrigerants, lubri-
cants and oils
Please dispose of the LCD display in accordance with
the local regulations for disposal of special waste.
Refrigerants that can no longer be used must be hand-
ed over to the gas suppliers for disposal.
The lubricants and oils recovered from the A/C systems
must be disposed in accordance with local regulations.
8.3 Disposal of filter drier
Dispose the filter drier through the designated return
points or in accordance with local regulations.
9. Technical data
Property Value/Range
Operating voltage 230 V ± 10 %
Frequency 50 Hz
Refrigerant R134a
R134a scale 50 kg
LP manometer -1 bar - 15 bar ± 1.6 % of final value
HP manometer -1 bar - 34 bar ± 1.6 % of final value
Refrigerant tank capacity 12 l
Maximum system pres-
sure PS
20 bar
Pset 18 bar
Medium group Group 2
Power
Permissible ambient tem-
perature TS
10 OC - 50 OC
Optimum filling weight of
R134a for operation
4 kg - 7 kg
Dimensions (H x W x D)
(mm)
1020 x 530 x 610
Weight 75 kg

Bosch Limited
P.B. No.3000, Hosur Road
Bangalore 560 030
INDIA
www.boschindia.com
[email protected]
F 002 DG9 448 | 2018-02-01